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Home My WebLink About122022-08.1 ADMINISTRATIVE STAFF REPORT 8.1 TO: Mayor and Town Council December 20, 2022 SUBJECT: Resolution No. 103-2022, adopting a Mitigated Negative Declaration of Environmental Significance and approving the ultimate trail alignment in preparation of the final design phase for the Diablo Road Trail Project, CIP No. C-055 BACKGROUND The Town’s vision to develop a continuous multi-use path along the Diablo Road corridor is reflected in each of Danville’s key planning documents over the past three decades, tracing back to the Danville 2005 General Plan, (adopted in 1987) and Townwide Trails Master Plan (adopted in 1989). In each of these policy documents, the objective of developing a multi-use path along the corridor is clear while the exact alignment remained undetermined. Potential alignment options ranged from on-road bicycle lanes to a grade-separated off-road trail. Given right-of-way constraints in the corridor, all options necessitate a dedication of land from the Magee property located on the south side of Diablo Road. In 2018, the Town completed the Diablo Road Trail Conceptual Alignment and Feasibility Analysis that provided an analysis of several trail alignment options in preparation of the Environmental and Design phases of the project. Currently, the Diablo Road Trail Project (Capital Improvement Program Project No. C-055) is nearing completion of the Environmental phase and will proceed to the Final Design phase with completion expected in late Winter 2023, with the goal to begin the Construction phase in summer/fall of 2023. The total estimated project cost is approximately $5.7M and is fully funded in the 2022/23 Five-Year Capital Improvement Program (Attachment B). In accordance with the California Environmental Quality Act (CEQA) (California Public Resources Code [PRC] §21000 et seq.) and the State CEQA Guidelines (California Code of Regulations [CCR], Title 14, §15000 et seq.), an Initial Study/Mitigated Negative Declaration (IS/MND) has been prepared to evaluate the potential environmental effects associated with the construction and operation of the proposed Diablo Road Trail Project. DISCUSSION The Town prepared and circulated an Initial Study and Mitigated Negative Declaration, or “MND” (Attachment A, Exhibit 1). This document examined in detail several potential environmental factors including Aesthetics, Air Quality, Biological Resources, Cultural Resources, Geology and Soils, Greenhouse Gas Emissions, and Hydrology and Water Quality. Adopt Mitigated Negative Declaration 2 December 20, 2022 And Approve Alignment for Diablo Trail Project, CIP C-055 All identified potentially significant environmental impacts would be less than significant with implementation of recommended mitigation measures. Mitigation measures were prepared and included in the MND to guide the project during implementation. The measures require activities and adherence to timelines to assure no adverse impacts from construction. A complete list of mitigation measures is included in Exhibit 1. All mitigation measures will be carefully followed before, during, and after construction. Once the MND is adopted, the Town will pursue permits from various resource agencies, such as the U.S. Fish & Wildlife Service and the Regional Water Quality Control Board, that will oversee the project during the construction phase. These agencies are expected to issue final permits within the next few months, allowing construction to commence next year. Ultimate Alignment of Diablo Road Trail As previously described, the Diablo Road Trail Conceptual Alignment and Feasibility Analysis was completed in 2018 and analyzed several alignment options with accompanying planning-level construction costs. Subsequently, staff identified an alignment option that will provide a more direct, and cost and construction-feasible route that will be located along the south side – and directly adjacent to – Diablo Road starting at Fairway Drive to the west and ending approximately 400 feet west of the intersection of Avenida Nueva and Diablo Road to the east (Attachment A, Exhibit 2). The trail will continue east connecting with a new, 0.7-mile paved path segment that is currently under construction as part of the Magee Preserve Development. In total, the new trail segments and existing 0.5-mile Diablo Road Trail (aka Barbara Haile Trail) will provide a contiguous, 2.1-mile Class I facility connecting the Diablo Road/Green Valley Road intersection with Blackhawk Road (Figure 1 and Attachment C). Adopt Mitigated Negative Declaration 3 December 20, 2022 And Approve Alignment for Diablo Trail Project, CIP C-055 Figure 1 – Diablo Road Trail Alignment Town Council and Commission Updates Project updates were recently provided to the Bicycle Advisory Commission a its special meeting of November 28, 2022, and subsequently to the Parks, Recreation and Arts Commission at its special meeting of December 14, 2022. As the final design process progresses, staff will continue to provide updates and request feedback from the Town Council and Commissions, as directed. PUBLIC CONTACT Pursuant to the CEQA Guidelines, the Town sent the Notice of Availability and public review period for the MND to the Contra Costa County Clerk’s Office and to the Office of the State Clearinghouse for a 45-day public review period between October 3 and November 17, 2022. As requested, an extension of two weeks was granted to the U.S. Fish & Wildlife Service and Regional Water Quality Control Board extending the review period to November 30, 2022. The Town received comments from Contra Costa County Flood Control and Water Conservation District and East Bay Municipal Utility District (Attachment D). Although comments received raise no issues requiring a response, both comments have been addressed in the attached MND. Posting of the meeting agenda serves as notice to the general public. FISCAL IMPACT None. Adopt Mitigated Negative Declaration 4 December 20, 2022 And Approve Alignment for Diablo Trail Project, CIP C-055 RECOMMENDATION Adopt Resolution No. 103-2022, adopting a Mitigated Negative Declaration of Environmental Significance and approving the ultimate trail alignment in preparation of the final design phase for the Diablo Road Trail Project, CIP No. C-055. Prepared by: Nader Salama Senior Civil Engineer Andrew Dillard Transportation Manager Reviewed by: Tai J. Williams Assistant Town Manager Attachments: A – Resolution No. 103-2022 Exhibit 1 – Mitigated Negative Declaration Exhibit 2 – Preliminary Plans - Alignment and Elevation B – CIP Page C-055 C – Project Location Map D – Flood Control and Water Conservation District and East Bay Municipal Utility District Comments RESOLUTION NO. 103-2022 ADOPTING A MITIGATED NEGATIVE DECLARATION OF ENVIRONMENTAL SIGNIFICANCE AND APPROVING THE ULTIMATE TRAIL ALIGNMENT IN PREPARATION OF THE FINAL DESIGN PHASE FOR THE DIABLO ROAD TRAIL PROJECT, CIP NO. C-055 WHEREAS, in accordance with the California Environmental Quality Act (CEQA) (California Public Resources Code [PRC] §21000 et seq.) and the State CEQA Guidelines (California Code of Regulations [CCR], Title 14, §15000 et seq.), the Town is required to prepare an Initial Study/Mitigated Negative Declaration (IS/MND) to evaluate the potential environmental effects associated with the construction and operation of the proposed Diablo Road Trail Project CIP No. C-055; and WHEREAS, the Town prepared an Initial Study and Mitigated Negative Declaration as required by the California Environmental Quality Act (CEQA); and WHEREAS, said Initial Study and Mitigated Negative Declaration indicates that, with careful adherence to Mitigation Measures included therein, no significant adverse environmental impacts are expected to be associated with the project; and WHEREAS, the Town received comments from the Contra Costa County Flood Control and Water Conservation District and East Bay Municipal Utility District, although no response was necessary; and WHEREAS, in August 2018 the Town completed the Diablo Road Trail Conceptual Alignment and Feasibility Analysis; and WHEREAS, the Town has determined that the proposed ultimate alignment of the Diablo Road Trail is the most cost and construction-feasible option; now, therefore be it RESOLVED, by the Danville Town Council, that the Initial Study and Mitigated Negative Declaration for the Diablo Road Trail Project, CIP No. C-055, is hereby adopted; and, be it further RESOLVED, that the Town of Danville attests to the accuracy of and approves the statements in Exhibit 1 to this resolution; and, be it further RESOLVED, by the Danville Town Council, that a Notice of Determination shall be filed within five days of this approval in accordance with CEQA; and, be it further RESOLVED, that the Town of Danville approves the ultimate alignment of the Diablo Road Trail, as defined in Exhibit 2 to this resolution. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 PAGE 2 OF RESOLUTION NO. 103-2022 APPROVED by the Danville Town Council at a regular meeting on December 20, 2022 by the following vote: AYES: NOES: ABSTAINED: ABSENT: ______________________________ MAYOR APPROVED AS TO FORM: ATTEST: _____________________________________________________________ CITY ATTORNEY CITY CLERK DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |1 MITIGATED NEGATIVE DECLARATION PURSUANT TO: CALIFORNIA ENVIRONMENTAL QUALITY ACT PROJECT TITLE: Diablo Road Trail LEAD AGENCY: Town of Danville 510 La Gonda Way Danville, CA 94526 PROJECT SPONSOR: Town of Danville 510 La Gonda Way Danville, CA 94526 PROJECT LOCATION: The Diablo Road project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail and pedestrian and bicycle roadway crossing would be within the Town of Danville. PROJECT DESCRIPTION: The proposed Diablo Road Trail Project (proposed project) consists of construction of an 8-foot-wide off-street paved multi-use path with 2 foot gravel shoulders along the southern shoulder of Diablo Road and a pedestrian and bicycle roadway crossing. The project site is located immediately north of East Branch Green Valley Creek and property belonging to the Magee Cattle Ranch, and south of single-family residential uses. The project site is characterized as highly disturbed, ruderal (weedy) habitat with overhanging mixed riparian woodland canopy. The proposed project is envisioned as a 0.9-mile, mostly Class I, mixed-use path for pedestrians and cyclists that will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project is located within the Town of Danville and public right of way (ROW) and on easements to be obtained from private property owners. The west end of the project would terminate just east of the intersection of Fairway Drive and Diablo Road and the east end of the project would terminate approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road. Completion of the proposed project would include emergency repairs required to protect Diablo Road in place as a result of erosion. The project would stabilize slope and improve erosion protection. The project would also provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Diablo Road Trail (aka Barbara Haile Trail) and access to Mount Diablo State Park. These benefits are described in the policies and objectives of the Town of Danville Bicycle Master Plan, Danville’s 2030 General Plan, and the Contra Costa Countywide Bicycle and Pedestrian Plan. The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations, narrowing to a lesser width in constrained locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. New fencing would be installed on a portion of the north side of the trail starting from just east of the Alameda Diablo and Diablo Road intersection to the eastern terminus of the trail, and on the south side of the proposed alignment, fencing would be installed from the stream crossing at Alameda Diablo to the detention facility. EXHIBIT 1 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |2 Fencing would consist of either split rail or open wire fencing to protect cattle from encroaching onto the trail. Retaining walls would be constructed with wood supported on piers; however, mechanically stabilized earth, concrete barrier, block walls, or other types could be utilized in the final design. Most retaining walls would be less than 3 feet tall, though in a few locations local topography would require the construction of walls up to 5 feet in height. The retaining walls would have a blended visual appearance to existing walls in the area. The proposed project would include a pedestrian and bicycle roadway crossing at the intersection of Diablo Road in the vicinity of Fairway Drive. The crossing would connect to the existing Diablo Road Trail Class I bicycle/pedestrian path that lies parallel to Diablo Road on the north side of the roadway. The crossing would include crosswalk striping and pavement markings; regulatory, warning and guide signage; at-grade asphalt concrete ADA ramps (landings) with truncated domes at existing and proposed trailheads; High-Intensity Activated Crosswalk System (HAWK); advanced warning beacon system; and associated electrical infrastructure. A portion of East Branch Green Valley Creek, a perennial waterway, is located just outside the southern boundary of the project site. Up to 150 sq ft of the trail alignment would encroach on drainage areas of the creek. The proposed project would require the installation of new culverts or culvert extensions throughout the alignment. The type, size and material of culvert extensions would be designed to match existing conditions. Runoff on the project site generally converges at topographic low points before being conveyed by vegetated or permeable swale- and drainage-like features. Once constructed, portions of the proposed trail alignment adjacent to East Branch Green Valley Creek would sheetflow toward Diablo Road and follow the existing drainage pattern. The eastern portion of the alignment would discharge to adjacent permeable areas, non-erodible surfaces, and existing inlets. Total excavation and fill of soils for the proposed project would require approximately 115 cubic yards (cy) of imported soils and 400 cy of exported soil. Material brought on to the site would be tested in accordance with local and state requirements to ensure contaminated material is not brought on site. Material that is not removed from the project area once excavated would be stockpiled and stabilized until it could be off-hauled. Vegetation and tree removal would be required to construct the trail and would include the removal of native trees and non-native trees. As further discussed in Section 4.4, Biological Resources, trees along the alignment that were determined by a certified arborist’s inspection to be in poor condition, as well as trees that cannot be avoided, have been recommended for removal. The trail alignment has been designed to avoid the removal of protected or heritage trees where feasible. Underground utilities would remain in place and no utility relocation is required. No additional or expanded use of water or wastewater facilities is proposed as part of this project. Access to the construction site would occur from Diablo Road and adjacent roads. While final staging areas would be decided by the contractor, staging would primarily occur within the proposed trail alignment or at the eastern terminus of the trail alignment, on the property to the south of Diablo Road, approximately 400 feet west of Ave Nueva. These areas would be used to store and stage materials and equipment at different times throughout project construction. Staging areas outside of the proposed alignment would typically consist of previously disturbed areas with, gravel, bare or paved surfaces. Project construction is anticipated to take approximately 6 months to complete and would begin around May 2023. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |3 Following completion of construction, the trail would be maintained through a Geologic Hazards Abatement District (GHAD) and in accordance with easement agreements. Trail operation and maintenance would require occasional sweeping, litter pick-up, and vegetation and tree trimming to maintain adequate vertical clearance for trail users. FINDINGS The environmental analysis provided in this Initial Study indicates that the proposed project will not result in any significant adverse unmitigable impacts on the environment. For this reason, the Town of Danville determined that a Mitigated Negative Declaration is the appropriate CEQA document for the proposed project. The Town of Danville finds that Diablo Road Trail Project WILL NOT result in a significant effect on the environment for the following reasons: A. The proposed project would be compatible with the Town of Danville General Plan and existing surrounding uses. B. Criteria pollutant emissions from the proposed Project would remain below their respective thresholds and impacts would be considered less than significant. C. The proposed project would not result in potentially significant impacts to sensitive animal and plant species, sensitive vegetation communities, jurisdictional areas (U.S. Army Corps of Engineers and California Department Fish and Wildlife), and spread of invasive plant species. D. The proposed project would not impact any historic resource listed on the National Register, on the local register, or the California Register of Historic Resources. Construction could potentially impact unknown archaeological resources, tribal cultural resources, or human remains. Mitigation identified below would reduce these potential impacts to a level of less than significant. E. The proposed project would not result in a potentially significant impact to a geologic unit or soil that is unstable and impacts would be considered less than significant. F. Construction of the proposed project could potentially impact unknown paleontological resources. Mitigation identified below would reduce these potential impacts to a level of less than significant. G. The proposed project would not result in potentially significant impacts related to noise as a result of project construction or long-term operational noise. Project noise levels would be in compliance with the Town’s Noise Ordinance. H. The proposed project would not result in direct or indirect significant impacts related to transportation and impacts would be considered less than significant. I. The proposed project would not result in direct or indirect significant impacts to aesthetics, agriculture and forestry resources, air quality, biological resources, cultural resources, energy, geology and soils, greenhouse gas emissions, hazards and hazardous materials, hydrology and water quality, land use and planning, mineral resources, noise, population and housing, public services, recreation, transportation, tribal cultural resources, utilities and service systems, and wildfires. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |4 MITIGATION MEASURES Implementation of project-specific mitigation measures identified below would reduce potentially significant impacts to below a level of significance. Biological Resources BIO-1: Migratory Birds and Raptors/Nest Avoidance. Tree and vegetation clearing (removal, pruning, trimming, and mowing) shall be scheduled to occur outside the migratory bird nesting season (February 1 through August 31). However, if clearing and/or construction activities will occur during the migratory bird nesting season, then preconstruction surveys to identify active migratory bird and/or raptor nests shall be conducted by a qualified biologist within 14 days of construction initiation on the project site and within 300 feet (i.e., zone of influence) of project- related activities. The zone of influence includes areas outside the project site where birds could be disturbed by construction-related noise or earth-moving vibrations. If active nest, roost, or burrow sites are identified within the project site, a no disturbance buffer shall be established for all active nest sites prior to commencement of any proposed project- related activities to avoid construction or access-related disturbances to migratory bird nesting activities. A no-disturbance buffer constitutes a zone in which proposed project-related activities (e.g., vegetation removal, earth moving, and construction) cannot occur. A minimum buffer size of 50 feet for passerines and 300 feet for raptors will be implemented; sizes of the buffers shall be determined by a qualified biologist based on the species, activities proposed near the nest, and topographic and other visual barriers. Buffers shall remain in place until the young have departed the area or fledged and/or the nest is inactive, as determined by the qualified biologist. If work is required within a buffer zone of an active bird nest, work may occur under the supervision of a qualified avian biologist. The qualified avian biologist monitoring the construction work will have the authority to stop work and adjust buffers if any disturbance to nesting activity is observed. BIO-2: Roosting Bats. A qualified biologist shall be hired to conduct surveys for special-status bats (pallid bat and Townsend’s big-eared bat) no more than two weeks prior to planned commencement of construction activities that have the potential to disturb bat day roosts or maternity roosts through elevated noise levels or removal of trees. If a visual survey is not sufficient to determine the presence/absence of bats, acoustic equipment (e.g., AnaBat) shall be used to determine potential occupancy type of species present. If an active maternity roost is detected, a qualified biologist shall determine an appropriate avoidance buffer to be maintained from April 1 until young are flying (typically through August). If an active day roost is detected in a tree or structure planned for removal, or within a zone of influence (i.e., noise, vibration) that could result in roost abandonment, as determined by a qualified biologist, the bats shall be safely evicted under the guidance of a qualified biologist. Day roosts shall not be removed unless the daytime temperature is at least 50 degrees Fahrenheit and there is no precipitation. Mitigation for day roosts impacted by the project will be achieved through the installation of bat houses on-site to replace lost roosts at a 1:1 ratio. Replacement roosts will be placed at the discretion of the qualified biologist. BIO-3: Obtain CDFW Section 1600 Lake or Streambed Alteration Agreement. If project activities encroach on the riparian zone of East Branch Green Valley Creek, the project proponent shall submit a Section 1600 Notification of Lake or Streambed Alteration application to CDFW. The Notification will include a description of impacts, including quantification of impacts to bed, DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |5 bank, and channel, as well as individual trees, area and linear footage of riparian vegetation, and proposed mitigation for impacts. It is likely that CDFW will require tree replacement mitigation compensation as a condition of the Lake or Streambed Alteration Agreement. Accordingly, the applicant proposes to mitigate for any impacts to native trees greater than 4 inches in diameter at breast height (DBH) via on- site replacement at a 3:1 (replacement to impacts) ratio. This tree replacement mitigation proposal to compensate for the project’s potential encroachment into the riparian canopy will likely satisfy mitigation requirements stipulated by CDFW. In consideration of overall project site aesthetics, replacement trees shall be planted near East Branch Green Valley Creek to contribute to the existing riparian canopy associated with this waterway. The trees’ health shall be monitored annually for 5 years by a qualified biologist or arborist and documented in annual monitoring reports. At the end of the 5-year monitoring period, at least 70 percent of planted trees shall be in good health. If survival is below 70 percent, additional trees shall be planted to bring the total number of planted trees up to 100 percent of the original number of trees planted. Irrigation and follow-up monitoring shall be established over an additional 3-year period following any replanting. BIO-4: Obtain RWQCB Waste Discharge Requirements Permit and US Army Corps of Engineers Section 404 Permit. If project activities encroach on areas, including the riparian zone and canopy of East Branch Green Valley Creek and below top-of-bank, or other areas potentially regulated by the RWQCB or USACE, the project proponent shall submit a report of Waste Discharge in order to obtain WDRs, and/or file a completed federal National Pollutant Discharge Elimination System (NPDES) permit application form with the San Francisco Bay RWQCB, and/or obtain a permit under Section 404 of the federal Clean Water Act, as appropriate. In addition, the project proponent shall develop a SWPPP that will be submitted to the Town of Danville as a condition of project approval demonstrating BMPs that shall be installed/implemented prior to project commencement. Stormwater protection and treatment measures shall be implemented to ensure that the proposed project remains in compliance with the Porter-Cologne Act and that discharges of dredged or fill material do not enter waters of the State. BIO-5: Tree Protection. Some trees on the project site are subject to the Town of Danville’s Tree Preservation Ordinance. At least 90 days prior to project initiation, a Tree Removal Application shall be submitted to the Town for review and for acquisition of a Tree Removal Permit, if required. The Town will consider the following criteria upon receipt of the application and prior to issuing a permit: 1. The condition of the tree with respect to its health, imminent danger of falling, proximity to existing structures, and interference with utility infrastructure; 2. The necessity to remove the tree to allow for the reasonable use, enjoyment, or development of the property; 3. The age and size of the protected tree with regard to the appropriate size of the area in which the tree is planted, and if removal would encourage healthy, more vigorous growth of other plant materials in the area; 4. Planning Commission may authorize removal if the tree is unreasonably adversely impacting the use of the property. Mitigation would be required; DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |6 5. The effect of the removal in relation to soil erosion and surface water flow; 6. The number of species, size, and location of other protected trees in the area and the effect of the removal as it pertains to shade, privacy between properties, and scenic beauty of the area; 7. Possible visual impacts within a Town-identified Major Ridgeline or Scenic Hillside Area. To compensate for the removal of any trees protected by the Town of Danville’s Tree Protection Ordinance, the applicant shall ensure the protection (i.e., health and safety) of trees to be retained and provide mitigation for trees authorized by the Town for removal. The applicant shall be required to replace on-site the Town-protected trees to be removed in accordance with the Preservation Ordinance and Tree Removal Permit. If tree mitigation planting cannot be accommodated on the project site, mitigation may be handled through the payment of an in-lieu fee, which shall be made payable to the Town of Danville. In-lieu mitigation funds received by the Town may be applied to an account chosen by the Town to allow the purchase and planting of trees (e.g., beautification trees) within the Town of Danville. Cultural Resources CUL‐1: Prior to initiating ground disturbing activities within the project area, construction personnel should be alerted to the possibility of encountering buried prehistoric or historic period cultural remains. Personnel should be advised that upon discovery of buried archaeological deposits, work in the immediate vicinity of the find should cease and a qualified archaeologist should be contacted immediately. Once the find has been identified, plans for the treatment, evaluation, and mitigation of impacts to the find shall be developed if it is found to be eligible for the National Register of Historic Places or the California Register of Historical Resources. CUL‐2: Archaeological resources unearthed by project construction activities shall be evaluated by a qualified archaeologist and Native American monitor. If the resources are Native American in origin, the tribe shall coordinate with the jurisdiction regarding treatment of these resources. The treatment plan established for the resources shall be in accordance with CEQA Guidelines Section 15064.5(f) for historical resources and PRC Section 21083.2(b) for unique archaeological resources. Preservation in place (i.e., avoidance) shall be the preferred manner of treatment. If preservation in place is not feasible, treatment may include implementation of archaeological data recovery excavations to remove the resource along with subsequent laboratory processing and analysis; provided no data recovery will be permitted to tribal cultural resources without prior consultation and consent of the Middletown. CUL-3: California Health and Safety Code Section 7050.5, State CEQA Guidelines Section 15064.5, and PRC Section 5097.98 mandate the process to be followed in the event of an accidental discovery of any human remains in a location other than a dedicated cemetery. California Health and Safety Code Section 7050.5 requires that in the event that human remains are discovered, disturbance of the site shall be halted until the coroner has investigated the circumstances, manner and cause of death, and the recommendations concerning the treatment and disposition of the human remains have been made to the person responsible for the excavation, or to his or her authorized representative, in the manner provided in PRC Section 5097.98. If the coroner determines that the remains are not subject to his or her authority and if the coroner recognizes or has reason to believe the human remains to be those of a Native DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Mitigated Negative Declaration |7 American, he or she shall contact, by telephone within 24 hours, the Native American Heritage Commission. Geology/Soils GEO‐1: If during the course of project construction, paleontological resources are accidentally discovered during construction, work shall be halted within 20 feet of the find until a qualified professional paleontologist can evaluate it. Work shall not recommence until the project paleontologist has submitted documentation to the Town indicating that discovered resources have been adequately salvaged and no further resources have been identified within the area of disturbance. Tribal Cultural Resources TCR-2: In the event that unanticipated tribal cultural resources are encountered during ground- disturbing activities, the project Tribal Cultural Advisor shall notify the project applicants by phone and may halt ground disturbance activities in the immediate area of discovery until further evaluation can be made in determining their significance and appropriate treatment or disposition. TCR-1: Prior to initial ground disturbance, the Town shall, in consultation with Tribal Contacts, approve a Tribal Cultural Advisor and the applicant shall ensure that all on-site project personnel shall receive adequate cultural resource sensitivity training developed in collaboration with the project’s Tribal Cultural Advisor or his or her authorized designee. The training shall ensure worker awareness of requirements regarding the protection of tribal cultural resources and the procedures to be implemented in the event that tribal resources are encountered. All training materials related to Tribal cultural resources shall be prepared in collaboration with the project’s Tribal Cultural Advisor or his or her authorized designee and shall be confidential and excluded from public records. THE INITIAL STUDY PREPARED FOR THIS STUDY IS ATTACHED. FORM PREPARED BY: David Crompton, Chief of Planning Town of Danville 510 La Gonda Way Danville, CA 94526 (925) 314-3349, email: dcrompton@danville.ca.gov Signature David Crompton, Chief of Planning Date For: Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Final Initial Study/Mitigated Negative Declaration December 2022 Prepared By Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Final IS/MND Table of Contents December 2022 Page i TABLE OF CONTENTS List of Figures ...........................................................................................................................ii List of Tables ............................................................................................................................ii List of Appendices ....................................................................................................................ii 1.0 Introduction & Purpose.................................................................................................. 1 1.1 Project Purpose and Scope of the Initial Study ............................................................ 1 1.2 Summary of Findings ................................................................................................. 1 1.3 Initial Study Public Review Process ............................................................................. 2 1.4 Report Organization................................................................................................... 3 2.0 Description of Proposed Project ..................................................................................... 4 2.1 Project Information ................................................................................................... 4 2.2 Project Description .................................................................................................... 5 3.0 Initial Study Checklist ....................................................................................................12 4.0 Environmental Analysis .................................................................................................14 4.1 Aesthetics.................................................................................................................14 4.2 Agriculture and Forestry Resources ...........................................................................19 4.3 Air Quality ................................................................................................................22 4.4 Biological Resources .................................................................................................28 4.5 Cultural Resources ....................................................................................................46 4.6 Energy ......................................................................................................................50 4.7 Geology and Soils......................................................................................................52 4.8 Greenhouse Gas Emissions........................................................................................58 4.9 Hazards and Hazardous Materials .............................................................................61 4.10 Hydrology and Water Quality ....................................................................................67 4.11 Land Use and Planning ..............................................................................................73 4.12 Mineral Resources ....................................................................................................75 4.13 Noise ........................................................................................................................76 4.14 Population and Housing ............................................................................................81 4.15 Public Services ..........................................................................................................82 4.16 Recreation ................................................................................................................84 4.17 Transportation ..........................................................................................................86 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Final IS/MND Table of Contents December 2022 Page ii 4.18 Tribal Cultural Resources ..........................................................................................88 4.19 Utilities and Service Systems .....................................................................................91 4.20 Wildfire ....................................................................................................................94 4.21 Mandatory Findings of Significance ...........................................................................97 5.0 References ...................................................................................................................99 LIST OF FIGURES Figure 1: Vicinity Map .............................................................................................................. 8 Figure 2: Proposed Project Location ......................................................................................... 9 Figure 3: Proposed Project ......................................................................................................10 Figure 4.4-1. Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site ........................................................................................34 Figure 4.4-2. Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site ........................................................................................37 LIST OF TABLES Table 4.3-1: Construction Emissions Summary and Significance Evaluation ..............................24 Table 4.4-1: Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site...............................................................................................................................31 Table 4.4-2: Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site ...................................................................................................................35 Table 4.4-3: Potentially Jurisdictional Aquatic Resources Delineated in the Study Area .............38 Table 4.5-1: Prior Cultural Resource Studies Associated with the Project Area..........................47 Table 4.13-1: Typical Vibration Levels for Construction Equipment ..........................................79 LIST OF APPENDICES Appendix A Air Quality Data Appendix B Biological Resources Report and Arborist Report Appendix C Archaeological Survey Report (Confidential) Appendix D Preliminary Geohazards Study Appendix E Response to Public Comments DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 1.0 Diablo Road Trail Final IS/MND Introduction & Purpose December 2022 Page 1 1.0 INTRODUCTION & PURPOSE 1.1 Project Purpose and Scope of the Initial Study In accordance with the California Environmental Quality Act (CEQA) (California Public Resources Code [PRC] §21000 et seq.) and the State CEQA Guidelines (California Code of Regulations [CCR], Title 14, §15000 et seq.), this Initial Study/Mitigated Negative Declaration (IS/MND) has been prepared to evaluate the potential environmental effects associated with the construction and operation of the proposed Diablo Road Trail Project (hereinafter referred to as the "proposed project" or "project"). This IS/MND includes a description of the proposed project; an evaluation of the project's potential environmental impacts; the findings of the environmental analyses; and recommended standard conditions and mitigation measures to lessen or avoid the project's potential significant adverse impacts on the environment. Pursuant to Section 15367 of the State CEQA Guidelines, the Town of Danville is the Lead Agency for the project. The Lead Agency is the public agency that has the principal responsibility for carrying out or approving a project. Town of Danville has the authority for environmental review in accordance with CEQA and certification of the environmental documentation. This IS/MND has evaluated each of the environmental issue areas contained in the checklist provided in Section 3.0. It provides decision-makers and the public with information concerning the potential environmental effects associated with the implementation of the proposed project, and potential ways to reduce or avoid possible environmental impacts. This Initial Study is intended to be used as a decision-making tool for the Town of Danville in considering and acting on the proposed project. Any responsible agency may elect to use this environmental analysis for discretionary actions associated with the implementation of the project. 1.2 Summary of Findings Based on the environmental checklist form completed for the proposed project and supporting environmental analysis, the project would have no impact or a less than significant impact on the following environmental issue areas: aesthetics, air quality, energy, greenhouse gas emissions, hazards, hydrology, land use, mineral resources, noise, population and housing, public services, recreation, transportation, utilities and service systems, and wildfire . The proposed project's impacts on the following issue areas would be less than significant with the implementation of mitigation: aesthetics, biological resources, cultural resources, geology and soils, and tribal cultural resources. All impacts would be less than significant after mitigation. As set forth in the State CEQA Guidelines Section 15070, an Initial Study leading to a Mitigated Negative Declaration (IS/MND) can be prepared when the Initial Study has identified potentially significant environmental impacts but revisions have been made to the project, prior to public DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 1.0 Diablo Road Trail Final IS/MND Introduction & Purpose December 2022 Page 2 review of the Initial Study, that would avoid or mitigate the impacts to a level considered less than significant, and there is no substantial evidence in light of the whole record before the public agency that the project may have a significant effect on the environment. 1.3 Initial Study Public Review Process The Notice of Intent (NOI) to Adopt a Mitigated Negative Declaration has been provided to the County of Contra Costa Clerk-Recorder and mailed to responsible agencies, nearby property owners, and others who expressed interest in being notified. A 30-day public review period has been established for the IS/MND in accordance with Section 15073 of the State CEQA Guidelines. During the public review period, the IS/MND, including the technical appendices, can be accessed on Town of Danville’s website and is available for review at the locations identified below. • https://www.danville.ca.gov/853/Diablo-Road-Trail • Danville Town Office City Hall: 510 La Gonda Way, Danville, CA 94526 • Danville Library: 400 Front Street, Danville, CA 94526 In reviewing the IS/MND, affected public agencies and interested members of the public should focus on the adequacy of the document in identifying and analyzing the potential environmental impacts and the ways in which the potentially significant effects of the project can be avoided or mitigated. During the public comment period, comments on the IS/MND and the analysis contained herein may be sent to: David Crompton, Chief of Planning Town of Danville 510 La Gonda Way Danville, CA 94526 Phone: (925) 314-3349 Written comments may also be sent via email to dcrompton@danville.ca.gov. Comments sent via email should include the project title in the subject line and a valid mailing address in the email. Following receipt and evaluation of comments from agencies, organizations, and/or individuals, the Town of Danville will determine whether any substantial new environmental issues have been raised. If so, further documentation may be required. If not, or if the issues raised do not provide substantial evidence that the project will have a significant effect on the environment, the IS/MND and the project will be considered for adoption and approval, respectively. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 1.0 Diablo Road Trail Final IS/MND Introduction & Purpose December 2022 Page 3 1.4 Report Organization This document has been organized into the following sections: Section 1.0 – Introduction. This section provides an introduction and overview describing the conclusions of the Initial Study. Section 2.0 – Project Description. This section identifies key project characteristics and includes a list of anticipated discretionary actions. Section 3.0 – Initial Study Checklist. The Environmental Checklist Form provides an overview of the potential impacts that may or may not result from project implementation. Section 4.0 – Environmental Evaluation. This section contains an analysis of environmental impacts identified in the environmental checklist. Section 5.0 – References. The section identifies resources used to prepare the Initial Study. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 2.0 Diablo Road Trail Final IS/MND Description of Proposed Project December 2022 Page 4 2.0 DESCRIPTION OF PROPOSED PROJECT 2.1 Project Information 1. Project title: Diablo Road Trail ("project") 2. Project introduction: This IS/MND has been prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. 3. Lead agency name and address: Town of Danville 510 La Gonda Way Danville, CA 94526 4. Contact person and phone number: Nader Salama, Senior Civil Engineer Phone: 925-314-3348 Email: nsalama@danville.ca.gov 5. Project location: The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail and pedestrian and bicycle roadway crossing would be within the Town of Danville; refer to Figure 1: Vicinity Map and Figure 2: Site Location Map. 6. Project sponsor's name and address: Town of Danville 510 La Gonda Way Danville, CA 94526 7. General plan designation: Rural Residential, Agricultural 8. Zoning: Planned Unit District (P-1) DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 2.0 Diablo Road Trail Final IS/MND Description of Proposed Project December 2022 Page 5 9. Surrounding Land Uses: The project site area includes single-family residential uses to the north and an open space preserve to the south. 10. Assessor's parcel numbers: The project site would largely be located south of Diablo Road, and would be directly adjacent to or within the following parcels: • 202-050-042-3 • 202-050-078-7 • 202-050-080-3 11. Other Project-Related Approvals, Agreements Which May Be Required (e.g., permits, agreements): • California Department of Fish and Wildlife • San Francisco Regional Water Quality Control Board • US Army Corps of Engineers • Town of Danville • Private property easements 2.2 Project Description The proposed Diablo Road Trail Project (proposed project) consists of construction of an 8-foot- wide off-street paved multi-use path with 2 foot gravel shoulders along the southern shoulder of Diablo Road and a pedestrian and bicycle roadway crossing. The project site is located immediately north of East Branch Green Valley Creek and property belonging to the Magee Cattle Ranch, and south of single-family residential uses. The project site is characterized as highly disturbed, ruderal (weedy) habitat with overhanging mixed riparian woodland canopy. The proposed project is envisioned as a 0.9-mile, mostly Class I, mixed-use path for pedestrians and cyclists that will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project is located within the Town of Danville and public right of way (ROW) and on easements to be obtained from private property owners. The west end of the project would terminate just east of the intersection of Fairway Drive and Diablo Road and the east end of the project would terminate approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road. (Figure 3: Proposed Project). Completion of the proposed project would include emergency repairs required to protect Diablo Road in place as a result of erosion. The project would stabilize slope and improve erosion protection. The project would also provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Diablo Road Trail (aka Barbara Haile Trail) and access to Mount Diablo State Park. These benefits are described in the DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 2.0 Diablo Road Trail Final IS/MND Description of Proposed Project December 2022 Page 6 policies and objectives of the Town of Danville Bicycle Master Plan, Danville’s 2030 General Plan, and the Contra Costa Countywide Bicycle and Pedestrian Plan. The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations, narrowing to a lesser width in constrained locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. As shown in Figure 3: Proposed Project, new fencing would be installed on a portion of the north side of the trail starting from just east of the Alameda Diablo and Diablo Road intersection to the eastern terminus of the trail, and on the south side of the proposed alignment, fencing would be installed from the stream crossing at Alameda Diablo to the detention facility. Fencing would consist of either split rail or open wire fencing to protect cattle from encroaching onto the trail. Retaining walls would be constructed with wood supported on piers; however, mechanically stabilized earth, concrete barrier, block walls, or other types could be utilized in the final design. Most retaining walls would be less than 3 feet tall, though in a few locations local topography would require the construction of walls up to 5 feet in height. The retaining walls would have a blended visual appearance to existing walls in the area. The proposed project would include a pedestrian and bicycle roadway crossing at the intersection of Diablo Road in the vicinity of Fairway Drive. The crossing would connect to the existing Diablo Road Trail Class I bicycle/pedestrian path that lies parallel to Diablo Road on the north side of the roadway. The crossing would include crosswalk striping and pavement markings; regulatory, warning and guide signage; at-grade asphalt concrete ADA ramps (landings) with truncated domes at existing and proposed trailheads; High-Intensity Activated Crosswalk System (HAWK); advanced warning beacon system; and associated electrical infrastructure. A portion of East Branch Green Valley Creek, a perennial waterway, is located just outside the southern boundary of the project site. As shown in Figure 3: Proposed Project, up to 150 sq ft of the trail alignment would encroach on drainage areas of the creek. The proposed project would require the installation of new culverts or culvert extensions throughout the alignment. The type, size and material of culvert extensions would be designed to match existing conditions. Runoff on the project site generally converges at topographic low points before being conveyed by vegetated or permeable swale- and drainage-like features. Once constructed, portions of the proposed trail alignment adjacent to East Branch Green Valley Creek would sheetflow toward Diablo Road and follow the existing drainage pattern. The eastern portion of the alignment would discharge to adjacent permeable areas, non-erodible surfaces, and existing inlets. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 2.0 Diablo Road Trail Final IS/MND Description of Proposed Project December 2022 Page 7 Total excavation and fill of soils for the proposed project would require approximately 115 cubic yards (cy) of imported soils and 400 cy of exported soil. Material brought on to the site would be tested in accordance with local and state requirements to ensure contaminated material is not brought on site. Material that is not removed from the project area once excavated would be stockpiled and stabilized until it could be off-hauled. Vegetation and tree removal would be required to construct the trail and would include the removal of native trees and non-native trees. As further discussed in Section 4.4, Biological Resources, trees along the alignment that were determined by a certified arborist’s inspection to be in poor condition, as well as trees that cannot be avoided, have been recommended for removal. The trail alignment has been designed to avoid the removal of protected or heritage trees where feasible. Underground utilities would remain in place and no utility relocation is required. No additional or expanded use of water or wastewater facilities is proposed as part of this project. Access to the construction site would occur from Diablo Road and adjacent roads. While final staging areas would be decided by the contractor, staging would primarily occur within the proposed trail alignment or at the eastern terminus of the trail alignment, on the property to the south of Diablo Road, approximately 400 feet west of Ave Nueva. These areas would be used to store and stage materials and equipment at different times throughout project construction. Staging areas outside of the proposed alignment would typically consist of previously disturbed areas with, gravel, bare or paved surfaces. Project construction is anticipated to take approximately 6 months to complete and would begin around May 2023. Following completion of construction, the trail would be maintained through a Geologic Hazards Abatement District (GHAD) and in accordance with easement agreements. Trail operation and maintenance would require occasional sweeping, litter pick-up, and vegetation and tree trimming to maintain adequate vertical clearance for trail users. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 FIGURE 1: Vicinity Map Diablo Road Trail Danville, CA Source: Google Maps, 2022 Project LocationProject Location DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 FIGURE 2: Proposed Project Location Diablo Road Trail Diablo R d Diablo R d A v e N u e v a A v e N u e v a Diablo RdDiablo Rd Alameda Dia b l o Alameda Dia b l o Calle Ar r o y o Calle Ar r o y o Cal l e A r r o y o Cal l e A r r o y o Fa i r w a y D r Fa i r w a y D r Project LocationProject Location Source: Nearmap, 2022 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 E a s t B r a n c h G r e e n V a l l e y C re e k Diablo Rd East Branch Green Valley Cree k Diablo Rd Diab l o Rd East Branch G r een Valley C r e e k Alameda D i ablo Diablo Rd 660 640 630 6 2 0 610 5 9 0 580 57 0560 540 5 30 520 510 490 640 630 620 610 590 580 6 3 0 6 2 0 6 1 0 Dia bl o R d EastBranch Green V a l l e y C r e e k Eas t B r anch Green V a ll ey C ree k Diablo R d East B r a n c h G r e e n V a l ley C reek Alam e da D iablo DiabloRd Di ablo Rd 580 570 560 540 530 520 510 490 480 470 460 570 560 540 530 59 0 580 490 470 460 D i a b l o R d A l am e d a Di ab lo M t D i ab l o S c e n ic B l v d Calle Arroyo D i a b l o R d Diablo CountryClub Trail Pedestrian Crossing Trail Shoulder Construction Staging Area Contours Fencing Retaining Wall Page 1 of 2 Pedestrian Crossing Just before intersection of Diablo Rd and Fairway Dr Panel 1-A Panel 1-B F F Figure 3A: Proposed Project Sources: Contra Costa County, Nearmap 0 10050 Feet 0 10050 Feet DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 La C a d e n a East B r a n c h G r e e n Val l e y C r eek Di abl o R d A v e n i d a N u e v a Eas t B r a n c h GreenValley C r e ek Avenida Nueva E l Ce n t ro La C a d e n a D iab lo R d Ea st B r a n c h G reen V a lley Creek D i abl o R d Cr e e k l e d g e C t Ea st B r a n c h G r een V al ley C r ee k 670 64 0 63 0 6 20 610 590 5 8 0570 560 54 0 67 066 0 64063062 0 640 630 620 610 590 580 530 6 40 560 E a s t Bran ch G r e e n V a l l e y Cr eek A l ameda D i ab l o Diablo Rd East B r a n c h G r e e n V alley Creek Diablo R d East B r anch G r een Valle y C re e k Diablo R d 640 630 6 20 610 590 580 570 560 540 530 580 570 5 2 0 51 0 560 5 9 0 D i a b l o R d A l am e d a Di ab lo M t D i ab l o S c e n ic B l v d Calle Arroyo D i a b l o R d Diablo CountryClub Panel 2-A Panel 2-B F F Trail Pedestrian Crossing Trail Shoulder Construction Staging Area Contours Fencing Retaining Wall Page 2 of 2 Figure 3A: Proposed Project Sources: Contra Costa County, Nearmap 0 10050 Feet 0 200100 Feet DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 3.0 Diablo Road Trail Final IS/MND Initial Study Checklist December 2022 Page 12 3.0 INITIAL STUDY CHECKLIST ENVIRONMENTAL FACTORS POTENTIALLY AFFECTED: The environmental factors checked below would be potentially affected by this project, involving at least one impact that is a "Potentially Significant Impact" as indicated by the checklist on the following pages. Aesthetics Agricultural and Forestry Resources Air Quality Biological Resources Cultural Resources Energy Geology/Soils Greenhouse Gas Emissions Hazards & Hazardous Materials Hydrology/Water Quality Land Use/Planning Mineral Resources Noise Population/Housing Public Services Recreation Transportation Tribal Cultural Resources Utilities/Service Systems Wildfire Mandatory Findings of Significance DETERMINATION: On the basis of this initial evaluation (check one): I find that the proposed project COULD NOT have a significant effect on the environment, and a NEGATIVE DECLARATION will be prepared. I find that although the proposed project could have a significant effect on the environment, there will not be a significant effect in this case because revisions in the project have been made by or agreed to by the project proponent. A MITIGATED NEGATIVE DECLARATION will be prepared. I find that the proposed project MAY have a significant effect on the environment, and an ENVIRONMENTAL IMPACT REPORT is required. I find that the proposed project MAY have a "potentially significant impact" or "potentially significant unless mitigated" impact on the environment, but at least one effect 1) has been adequately analyzed in an earlier document pursuant to applicable legal standards, and 2) has been addressed by mitigation measures based on the earlier analysis as described on attached sheets. An ENVIRONMENTAL IMPACT REPORT is required, but it must analyze only the effects that remain to be addressed. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 3.0 Diablo Road Trail Final IS/MND Initial Study Checklist December 2022 Page 13 I find that although the proposed project could have a significant effect on the environment, because all potentially significant effects (a) have been analyzed adequately in an earlier EIR or NEGATIVE DECLARATION pursuant to applicable standards, and (b) have been avoided or mitigated pursuant to that earlier EIR or NEGATIVE DECLARATION, including revisions or mitigation measures CERTIFICATION: 9/9/2022 David Crompton, Chief of Planning Date Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 14 4.0 ENVIRONMENTAL ANALYSIS Section 4.0, Environmental Analysis, discusses the project's potential for impacts to various resources. The discussion follows the format of Appendix G of the currently adopted CEQA Guidelines1, and identifies any potentially significant impacts that could result from project implementation. Mitigation measures are identified, where necessary, to reduce potentially significant impacts to less than significant levels. No significant and unavoidable impacts were identified. 4.1 Aesthetics ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Except as provided in Public Resources Code Section 21099, would the project: a) Have a substantial adverse effect on a scenic vista? X b) Substantially damage scenic resources, including but not limited to trees, rock outcroppings, and historic buildings within a state scenic highway? X c) In non-urbanized areas, substantially degrade the existing visual character or quality of public views of the site and its surroundings? (Public views are those that are experienced from publicly accessible vantage point). If the project is in an urbanized area, would the project conflict with applicable zoning and other regulations governing scenic quality? X 1 The Office of Planning and Research (OPR) publishes the latest guidelines online: https://opr.ca.gov/ceqa/guidelines/ DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 15 ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact d) Create a new source of substantial light or glare which would adversely affect day or nighttime views in the area? X a) Have a substantial adverse effect on a scenic vista? Less Than Significant Impact. Under CEQA, a scenic vista is defined as a viewpoint that provides expansive views of a highly valued landscape for the public's benefit. According to the Danville 2030 General Plan, the eastern portion of Danville where the project site is located includes one of the Town’s most prominent scenic ridgeline, Short Ridge. The vertical features associated with the proposed project such as retaining walls would be less than 3 feet tall, though in a few locations local topography would require the construction of walls up to 5 feet in height. The retaining walls would have a blended visual appearance to existing walls in the area. Where retaining walls are proposed, they would be used to conform the trail to existing grade and are not anticipated to obstruct views from sensitive viewpoints. Therefore, due to the limited vertical development and the harmonious design of the vertical features associated with the project, a less than significant impact would occur, and no mitigation is required. Project construction would not substantially or permanently obstruct views of scenic vistas. Construction activities that would have the potential to temporarily alter views would consist of operation of construction equipment that could temporarily interrupt views of surrounding scenic vistas. Any obstruction to views of scenic vistas are expected to occur during construction and shall cease upon completion of the proposed project. b) Substantially damage scenic resources, including but not limited to trees, rock outcroppings, and historic buildings within a state scenic highway? Less Than Significant Impact. There are no officially designated State scenic highways within or near the project site.F 2 However, the 2030 General Plan designates Diablo Road between Interstate 680 and its transition to Blackhawk Road as a designated Scenic Route. The Town defines a Scenic Route as a road, street or freeway which transects an area characterized by its high visual character, vistas or cultural significance. The Town has implemented a number of actions to protect their scenic resources including the adoption of a Scenic Hillside and Major Ridgeline Development Ordinance and a Tree Preservation Ordinance. Projects subject to these 2 California Department of Transportation. (2022). List of Eligible and Officially Designated State Scenic Highways. Retrieved from: https://dot.ca.gov/programs/design/lap-landscape-architecture-and-community-livability/lap-liv-i-scenic-highways. Accessed January 14, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 16 ordinances are required to demonstrate compliance with them during the Town’s project review and approval process. Additionally, scenic resources would be protected through compliance with policies Environmental Quality 21.02, 21.03, 21.06 and 23.04 of the 2030 General Plan. Trail alignment is designed to avoid the removal of protected or heritage trees where feasible. The project would result in the removal of trees determined by the Arborist Report (See Appendix B) to be in poor condition, as well as trees that cannot be avoided, have been recommended for removal. Trees in poor condition can have a stunted or declining canopy, poor foliar color, possible disease, or insect issues and can include severe structural defects that may or may not be correctable. Trees identified as poor condition are not typically considered a reliable specimen for preservation. As discussed in Impact 4.1c, the project would not substantially degrade the existing visual character and quality of public views of the site and its surroundings. As discussed in Impact 4.5a, the project would not substantially impact historical buildings. The project would avoid impacts to rock outcroppings visible from Diablo Road since the project would be located along Diablo Road at or below grade with the road and so would not obstruct views of rock outcroppings. Therefore, the proposed project would have a less than significant impact on scenic resources along an officially designated scenic highway. c) In non-urbanized areas, substantially degrade the existing visual character or quality of public views of the site and its surroundings? (Public views are those that are experienced from publicly accessible vantage point). If the project is in an urbanized area, would the project conflict with applicable zoning and other regulations governing scenic quality? Less Than Significant With Mitigation Incorporated. The proposed project contains non- urbanized areas. During the construction period, construction equipment storage, and earth- moving would temporarily alter the existing visual quality of the affected area for adjacent sensitive viewers (recreational users and residential neighbors). Temporary construction activities along the proposed trail alignment could cause dust and material stockpiles that could create an untidy appearance, collectively degrading the visual quality of the site and surroundings. Where temporary construction activities occur, the activities could potentially temporarily degrade the existing visual quality for recreational users and residential neighbors to the north. However, these potential temporary construction impacts would be reduced by storing construction material, stockpiled soil, and equipment in staging areas beyond direct view of residents and recreationists and in already disturbed shoulder areas, to the greatest extent practicable. Staging areas would be in areas where the removal of trees, native vegetation, or large non-native trees would not be required and in areas where the ability to impact trees and/or shrubs would not be present (e.g., within the dripline of trees or shrubs, especially native species). Areas of temporary disturbance for the trail would be re-vegetated or stabilized with erosion control measures implemented in accordance with National Pollutant Discharge DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 17 Elimination System (NPDES) and environmental permit requirements. Following these requirements would reduce temporary visual impacts. The proposed project could adversely affect the visual character by vegetation removal along Diablo Road. Vegetation clearing would occur at a limited number of locations to construct the trail and proposed improvements. This would primarily consist of non-native grasslands in disturbed shoulder areas and tree removal and tree trimming. Areas of temporary disturbance would be revegetated in accordance with private property easement conditions, environmental permit conditions, and Town requirements. Where applicable, a seed mix appropriate for the climate and location would be used to revegetate disturbed areas. Currently, it is estimated that 25 trees would be removed over an approximately 0.9-mile corridor south of Diablo Road. Fifteen of the trees are native trees, and the remaining are non- native trees, five of which are in fair to poor condition. Implementation of mitigation measure (MM) BIO-5 would require the replacement of protected trees consistent with the Town’s tree protection requirements and CDFW replanting requirements (if any trees were to be removed within riparian areas under CDFW’ jurisdiction). With the maturation of replacement trees, impacts to the visual character from the loss of trees would be reduced to a less than significant level. Vertical features associated with the proposed project include culvert extensions and retaining walls. As discussed previously, the retaining walls would be designed to be harmonious with existing retaining walls in the area, consisting of earth tones and natural materials and other appropriate finishes appropriate with the surrounding environment. When considering if an impact is significant in a rural environment, the visibility of the proposed project alignment depends on the visibility of the project components considering the area’s landform (topography), land cover (vegetation and structures), and atmospheric conditions (dust, fog, precipitation). Most of the project alignment would be at grade with few components extending above grade (retaining walls and fencing). The proposed project would not significantly contrast with the existing environmental setting because most of the alignment would be constructed directly adjacent to and parallel to Diablo Road and the pedestrian and bicycle crossing would be constructed in the roadway right-of-way. The trail has been sited to minimize tree removal. Vegetation and tree removals would be subject to replanting requirements, as previously discussed. Through carefully selected staging areas, trail alignment location, minimal vertical features, and implementation of MM-BIO-5, the proposed project would not significantly impact visual quality to sensitive viewer groups along the trail alignment and impacts would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 18 d) Create a new source of substantial light or glare which would adversely affect day or nighttime views in the area? Less Than Significant Impact. Project construction would occur during daylight hours only and no impacts from nighttime construction lighting would occur. No lighting would be installed along the length of the trail. Lighting emanating from the HAWK advanced warning beacon system would only be visible when activated. Trail use at nighttime is anticipated to be low to negligible given the lack of lighting along the proposed trail alignment. Thus, the project would not substantially increase nighttime light and glare in the project area. Therefore, the project would result in a less than significant impact concerning a new source of light or glare. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 19 4.2 Agriculture and Forestry Resources ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact In determining whether impacts to agricultural resources are significant environmental effects, lead agencies may refer to the California Agricultural Land Evaluation and Site Assessment Model (1997) prepared by the California Department of Conservation as an optional model to use in assessing impacts on agriculture and farmland. Would the project: a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? X b) Conflict with existing zoning for agricultural use, or a Williamson Act contract? X c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code section 12220(g)), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code section 51104(g))? X d) Result in the loss of forest land or conversion of forest land to non- forest use? X e) Involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non- agricultural use or conversion of forest land to non-forest use? X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 20 a) Convert Prime Farmland, Unique Farmland, or Farmland of Statewide Importance (Farmland), as shown on the maps prepared pursuant to the Farmland Mapping and Monitoring Program of the California Resources Agency, to non-agricultural use? No Impact. The Farmland Mapping and Monitoring Program (FMMP) rates the production potential of agricultural land according to the following classifications: • Prime Farmland. Farmland with the best combination of physical and chemical features able to sustain long term agricultural production. This land has the soil quality, growing season, and moisture supply needed to produce sustained high yields. These are Class I and Class II soils. • Farmland of Statewide Importance. Farmland similar to Prime Farmland but with minor shortcomings, such as greater slopes or less ability to store soil moisture. Land must have been used for irrigated agricultural production at some time during the four years prior to the mapping date. • Unique Farmland. Farmland of lesser quality soils used for the production of the state's leading agricultural crops. This land is usually irrigated but may include non-irrigated orchards or vineyards as found in some climatic zones in California. • Farmland of Local Importance. Land of importance to the local agricultural economy as determined by each county's board of supervisors and a local advisory committee. • Grazing Land. Land on which the existing vegetation is suited to the grazing of livestock. • Urban and Built-Up Land. Land occupied by structures with a building density of at least 1 unit to 1.5 acres, or approximately 6 structures to a 10-acre parcel. This land is used for residential, industrial, commercial, construction, institutional, public administration, railroad and other transportation yards, cemeteries, airports, golf courses, sanitary landfills, sewage treatment, water control structures, and other developed purposes. Prime Farmland, Farmland of Statewide Importance, Unique Farmland, and Farmland of Local Importance are all Important Farmland and are collectively referred to as Important Farmland in this analysis. The project site is not designated as Prime Farmland, Unique Farmland, or Farmland of Statewide Importance on the State of California Important Farmland Map3. The project site, however, is designated as Grazing Land. Grazing Land is a category used for land on which the existing vegetation is suited to the grazing of livestock. This category is used only in California and was developed in cooperation with the California Cattlemen's Association, University of California Cooperative Extension, and other groups interested in the extent of grazing activities. 3 California Department of Conservation. (2022). State of California Important Farmland Map. Retrieved from: https://maps.conservation.ca.gov/DLRP/CIFF/. Accessed January 10, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 21 As the project site is not categorized as Important Farmland, the proposed project would not result in a conversion of documented agricultural lands to non-agricultural use. No impact would occur and no mitigation is required. b) Conflict with existing zoning for agricultural use, or a Williamson Act contract? No Impact. The project site is not identified as a property under a Williamson Contract in the Contra Costa County 2016 Agricultural Preserves Map4. Based on the Town of Danville Zoning Ordinance, the project site is zoned Planned Unit District (P-1). The project site is not zoned for agricultural use, is not under a Williamson Act contract, and as discussed above, is not categorized as Important Farmland. Therefore, the proposed project would not conflict with a Williamson Act Contract and would not conflict within the existing zoning. No impact would occur and no mitigation is required. c) Conflict with existing zoning for, or cause rezoning of, forest land (as defined in Public Resources Code section 12220(g)), timberland (as defined by Public Resources Code section 4526), or timberland zoned Timberland Production (as defined by Government Code section 51104(g))? No Impact. The project site is not currently zoned for forest land, timberland, or timberland zoned for production. Therefore, improvements planned as part of the proposed project would not conflict with existing zoning or cause rezoning of any such land nor would it convert forest land to non-forest use. Therefore, no impacts would occur. d) Result in the loss of forest land or conversion of forest land to non-forest use? No Impact. There is no forest land located within the project area. The project site is characterized as highly disturbed, ruderal (weedy) habitat with overhanging mixed riparian woodland canopy. As such, the proposed project would not affect any forest land or result in the conversion of forest land to non-forest use. Therefore, no impacts would occur. e) Involve other changes in the existing environment which, due to their location or nature, could result in conversion of Farmland, to non-agricultural use or conversion of forest land to non-forest use? No Impact. The proposed project would be located parallel to an existing roadway. The proposed project would not result in any indirect impacts, such as limiting access to an agricultural use or creating a remnant agricultural parcel that may result in further conversion of farmland beyond what is discussed in 4.2a. As such there would be no impact. 4 Contra Costa County. (2016). Agricultural Preserves Map. Retrieved from: https://maps.conservation.ca.gov/DLRP/CIFF/. Accessed January 10, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 22 4.3 Air Quality ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Where available, the significance criteria established by the applicable air quality management district or air pollution control district may be relied upon to make the following determinations. Would the project: a) Conflict with or obstruct implementation of the applicable air quality plan? X b) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non- attainment under an applicable federal or state ambient air quality standard? X c) Expose sensitive receptors to substantial pollutant concentrations? X d) Result in other emissions (such as those leading to odors adversely affecting a substantial number of people? X The proposed project is located in Contra Costa County, which lies within the Bay Area Air Quality Management District (BAAQMD), which regulates air quality in the San Francisco Bay Area. Air quality conditions in the San Francisco Bay Area have improved significantly since the BAAQMD was created in 1955. In Danville, and the rest of the air basin, exceedances of air quality standards occur primarily during meteorological conditions conducive to high pollution levels, such as cold, winless winter nights or hot, sunny summer afternoons. The Air Monitoring Program of the BAAQMD operates a 28-station monitoring network which provides the data required to determine whether the Bay Area is in compliance with state and federal air quality standards. Ozone (O3) levels, as measured by peak concentrations and the number of days over the state's 1-hour standard, have declined substantially as a result of the aggressive programs by the BAAQMD and other regional, state and federal agencies. The Bay Area was designated as a nonattainment area for the federal 8-hour ozone level. National and state standards have also been established for particulate matter 2.5 microns in diameter or less (PM2.5), over 24-hour DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 23 and yearly averaging periods. PM2.5 levels exceeded the federal 24-hour standards 30 times in the 3-year period.5 The Bay Area is a nonattainment area for the federal particulate matter 10 microns in diameter or less (PM10) standard and a nonattainment area at the state level. There was one exceedance of the state or federal PM10 standard was recorded at the monitoring station from 2018 to 2020. Furthermore, no exceedances of the state or federal carbon monoxide (CO) standard were recorded at the monitoring stations during the 3-year period. The region is required to adopt clean air plans on a triennial basis that show progress towards meeting the state ozone standard. The latest regional plan was adopted in April 2017. This plan includes a comprehensive strategy to reduce emissions from stationary, area, and mobile sources through the expeditious implementation of all feasible measures, including transportation control measures (TCMs) and programs such as "Spare the Air." a) Conflict with or obstruct implementation of the applicable air quality plan? Less than Significant Impact. Air quality plans describe air pollution control strategies and measures to be implemented by a city, county, region, and/or air district. The primary purpose of an air quality plan is to bring an area that does not attain federal and state air quality standards into compliance with the requirements of the federal Clean Air Act and California Clean Air Act. In addition, air quality plans are developed to ensure that an area maintains a healthful level of air quality based on the National Ambient Air Quality Standards (NAAQS) and the California Ambient Air Quality Standards (CAAQS). The Air Quality Management Plan (AQMP) is prepared by BAAQMD. The AQMP provides policies and control measures that reduce emissions to attain both state and federal ambient air quality standards. The most recently adopted plan, the Clean Air Plan, in the Basin outlines how the San Francisco Bay Area will attain air quality standards, reduce population exposure and protect public health, and reduce greenhouse gas (GHG) emissions. The Clean Air Plan assumptions for projected air emissions and pollutants throughout the Basin are based on General Plan Land Use Designations. The project is a trail and pedestrian and bicycle crossing and would be consistent with the development assumptions for the surrounding land use. Additionally, the project would not increase regional population growth or cause changes in vehicle traffic that would obstruct implementation of the Clean Air Plan in the San Francisco Bay Area Basin. Additionally, the proposed project would not significantly affect regional vehicle miles traveled pursuant to the CEQA Guidelines (Section 15206). Therefore, population growth from the project would be consistent with the Association of Bay Area Governments (ABAG)’s projections for the City Town and with the City’s Town’s General Plan. As described below, construction and operational air quality emissions generated by the proposed project would not exceed the BAAQMD’s emissions thresholds. Since the proposed project will not exceed these thresholds, the proposed project would not be considered by the 5 California Air Resource Board. (2022). Top 4 Summary: Highest 4 Daily 24-Hour PM2.5 Averages. https://www.arb.ca.gov/adam/topfour/topfourdisplay.php. Accessed January 7, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 24 BAAQMD to be a substantial emitter of criteria air pollutants and would not contribute to any non-attainment areas in the Basin. In addition, projects are considered consistent with the 2017 Clean Air Plan if they incorporate all applicable and feasible control measures from the 2017 Clean Air Plan and would not disrupt or hinder implementation of any 2017 Clean Air Plan control measures. Therefore, the project is consistent with the applicable air quality plan and impacts would be less than significant b) Result in a cumulatively considerable net increase of any criteria pollutant for which the project region is non-attainment under an applicable federal or state ambient air quality standard? Less Than Significant Impact. The BAAQMD 2017 CEQA Air Quality Guidelines provide criteria for determining cumulative impacts and consistency. The CEQA Air Quality Guidelines note that a project which is inconsistent with an Air Quality Plan would have a significant cumulative impact on regional air quality. As discussed in Impact (a) above, the project is consistent with the Air Quality Management Plan for the San Francisco Bay Area Air Basin (SFBAAB). In addition, the proposed project’s construction and operational emissions would not exceed BAAQMD thresholds as discussed below. Construction During construction, short-term degradation of air quality may occur due to the release of particulate emissions generated by excavation, grading, hauling, and other activities related to construction. Emissions from construction equipment also are anticipated and would include CO, nitrogen oxides (NOX), reactive organic gases (ROG), sulfur dioxide (SO2), directly-emitted particulate matter (PM10 and PM2.5), and toxic air contaminants (e.g., diesel exhaust PM). The regional construction emissions associated with development of the proposed project were calculated using CalEEMod version 2020.4.0. For the purposes of the air quality analysis, site disturbance would be approximately 20 acres and the construction timeframe would be around 5 months in duration. Construction would include grading, paving, and architectural coating. Typical construction detail equipment includes excavators, graders, scrapers, rollers, tractors, loaders, and air compressors. Table 4.3-1 shows construction emissions for the project. Table 4.3-1: Construction Emissions Summary and Significance Evaluation Construction Year Pollutant (maximum pounds per day)1 Reactive Organic Gases (ROG) Nitrogen Oxide (NOx) Exhaust Fugitive Dust Coarse Particulate Matter (PM10) Fine Particulate Matter (PM2.5) Coarse Particulate Matter (PM10) Fine Particulate Matter (PM2.5) 2023 1.37 14.90 0.61 0.56 3.16 1.50 BAAQMD Significance Threshold 2, 3 54 54 82 54 N/A N/A Exceed BAAQMD Threshold? No No No No N/A N/A DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 25 Table 4.3-1: Construction Emissions Summary and Significance Evaluation Construction Year Pollutant (maximum pounds per day)1 Reactive Organic Gases (ROG) Nitrogen Oxide (NOx) Exhaust Fugitive Dust Coarse Particulate Matter (PM10) Fine Particulate Matter (PM2.5) Coarse Particulate Matter (PM10) Fine Particulate Matter (PM2.5) 1. Emissions were calculated using CalEEMod. Mitigated emissions include compliance with the BAAQMD’s Basic Construction Mitigation Measures Recommended for All Projects. These measures include the following: water exposed surfaces two times daily; cover haul trucks; clean track outs with wet powered vacuum street sweepers; limit speeds on unpaved roads to 15 miles per hour; complete paving as soon as possible after grading; limit idling times to 5 minutes; properly maintain mobile and other construction equipment; and post a publicly visible sign with contact information to register dust complaints and take corrective action within 48 hours. 2. Bay Area Air Quality Management District, California Environmental Quality Act Air Quality Guidelines, updated May 2017. 3. BMPs = Best Management Practices. The BAAQMD recommends the implementation of all Basic Construction Mitigation Measures, whether or not construction-related emissions exceed applicable significance thresholds. Implementation of Basic Construction Mitigation measures are considered to mitigate fugitive dust emissions to be less than significant. Source: Refer to the CalEEMod outputs provided in Appendix A, Air Quality Data. As shown in Table 4.3-1: Construction Emissions Summary and Significance Evaluation, construction of the proposed project would not cause exceedances for ROG, NOx, PM2.5, and PM10. The calculated emission results for ROG, NOx, PM2.5, and PM10 from CalEEMod demonstrate that the construction of this project would not exceed maximum daily thresholds created by the BAAQMD. The proposed project emissions would not worsen ambient air quality, create additional violations of federal and state standards, or delay the Basin’s goal for meeting attainment standards. Construction impacts would be less than significant. Operational Long-term operational emissions are typically attributed to vehicle trips (mobile emissions), the use of natural gas (energy source emissions), and consumer products, architectural coatings, and landscape maintenance equipment (area source emissions). Implementation of the proposed project would enhance pedestrian safety, increase connectivity and mobility, and provide access for bicyclists and pedestrians. The project would serve existing pedestrians and bicyclists and would not generate growth. The proposed project does not include any new housing but instead is a pedestrian connection that would enhance existing facilities. Further, the proposed project would not generate new vehicle trips and no stationary sources are proposed. Therefore, operational emissions are less than significant and no mitigation is required. c) Expose sensitive receptors to substantial pollutant concentrations? Less Than Significant. Under CEQA, residences, schools, daycare centers, and healthcare facilities, such as hospitals, or retirement and nursing homes, are considered sensitive receptors. Single-family residences are located along the trail. The trail would be located approximately 50 feet from the nearest residential property line. However, the nearest residential structures are approximately 70 feet from the proposed trail. The proposed project involves developing a trail and a pedestrian and bicycle roadway which would not result in stationary emissions. The project would not include parking spaces or change existing land use activities; therefore, the project would not result in a substantial increase in traffic-related DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 26 pollutant concentrations that could affect sensitive receptors. Further, the dust and equipment exhaust emissions during construction would be minimal and would be controlled by compliance with BAAQMD Basic Construction Mitigation Measures. Construction and Operation Period Toxic Air Contaminant Impacts A toxic air contaminant (TAC) is an air pollutant that may cause or contribute to an increase in mortality or serious illness, or that may pose a hazard to human health. TACs are usually present in minute quantities in the ambient air; however, their high toxicity or health risk may pose a threat to public health even at low concentrations. The health risk associated with high concentrations of diesel exhaust from construction equipment has a carcinogenic and chronic effect, but no short-term acute effect is currently recognized. The project could potentially expose sensitive receptors to temporary health hazards associated with TACs due to the operation of construction equipment. However, concentrations of mobile source diesel particulate matter would only be present during temporary construction activities, and as previously shown in Table 4.3-1, PM10 emissions associated with construction activities would be well below the 82 lb/day threshold established by BAAQMD. Furthermore, the project operation emissions would be negligible (i.e., less than 2 pounds per day); therefore, no operational TAC impacts would occur. Compliance with BAAQMD recommended dust control measures would further reduce PM10 emissions. The health risk associated with construction emissions would be less than significant and no mitigation is required. Operational CO Hotspots Localized high levels of CO (CO hotspot) are associated with traffic congestion and idling or slow-moving vehicles. Impacts related to CO hotspots would be less than significant because the proposed project would not generate new vehicle trips and would only have short-term temporary traffic impacts during construction. The primary purpose of the project is to enhance pedestrian safety and increase connectivity, mobility, and access for bicyclists and pedestrians. Pedestrians and bicyclists and adjacent residents would not be exposed to substantial pollutant concentrations and the impact would be less than significant. d) Result in other emissions (such as those leading to odors adversely affecting a substantial number of people? No Impact. Construction activities associated with the project may generate detectable odors from heavy-duty equipment (e.g., diesel exhaust), as well as from architectural coatings and asphalt off-gassing. Odors generated from the referenced sources are common in the man- made environment and are not known to be substantially offensive to adjacent receptors. Any construction-related odors would be short-term in nature and cease upon project completion. BAAQMD has established odor screening thresholds for land uses that have the potential to generate complaints about substantial odors, including wastewater treatment plants, landfills or transfer stations, composting facilities, confined animal facilities, food manufacturing, and DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 27 chemical plants. BAAQMD’s thresholds for odors are qualitative based on BAAQMD’s Regulation 7: Odorous Substances. This rule places general limitations on odorous substances and specific emission limitations on certain odorous compounds. The proposed project would not be a source of objectionable odors therefore no impact would occur. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 28 4.4 Biological Resources ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service? X b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? X c) Have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? X d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? X e) Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance? X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 29 ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? X The following section is a summary of the Biological Resources Report (BRR)2F 6 the Aquatic Resources Delineation Report (ARDR)7, and the Tree Inventory and Preliminary Recommendations prepared for the proposed project and included as Appendix B. The BRR provides a description of existing biological resources on the project site and identifies potentially significant impacts that could occur to sensitive biological resources from the proposed project. The ARDR delineates aquatic resources on the project site that are potentially regulated under section 404 of the federal Clean Water Act (CWA) and the State Water Resources Control Board (SWRCB) State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State. The “study area” for the aquatic resource delineation consisted of the entire alignment of the proposed project and covers approximately 6.5 acres over approximately 0.9 miles along the southern shoulder of Diablo Road. The project site is located along the shoulder and right-of-way of Diablo Road immediately north of East Branch Green Valley Creek on its western side and south of the creek on its eastern side. East Branch Green Valley Creek flows east to west and connects with San Ramon Creek in downtown Danville. The project site slopes slightly from north to south, with short segments of the proposed footprint located below the top-of-bank of the creek, on the western side of the site. Elevation on the project site ranges from 465 to 581 feet above mean sea level (MSL). Plant Communities and Wildlife Habitats On December 15, 2021, staff conducted a survey of the project site and characterized vegetation present. Ruderal The project site is dominated by ruderal herbaceous habitat. Ruderal communities are groupings of plants that thrive in areas disturbed by human activity. Ruderal vegetation is 6 Sequoia Ecological Consulting. (2022). Biological Resources Report – Town of Danville Diablo Road Trail Project. 7 Sequoia Ecological Consulting. (2022). Aquatic Resources Delineation Report - Town of Danville Diablo Road Trail Project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 30 adapted to high levels of disturbance and endures for long periods of time in areas that have continual disturbance. Dominant grass and forb species observed within ruderal communities on the project site include black mustard (Brassica nigra), bristly ox-tongue (Helminthotheca echioides), California burclover (Medicago polymorpha), poison hemlock (Conium maculatum), and yellow star thistle (Centaurea solstitialis). Non-Native Annual Grassland Non-native annual grassland is comprised primarily of plant species that mature in spring and early summer, before spreading seed and dying in late summer and fall. Non-native annual grassland is found in large patches throughout the project site, primarily interspersed with ruderal communities. Dominant grass and forb species observed within non-native annual grassland communities on the project site include slender wild oat (Avena barbata), ripgut brome (Bromus diandrus), Italian thistle (Carduus pycnocephalus ssp. pycnocephalus), and filaree species (Erodium botrys, E. cicutarium). Mixed Riparian Woodland Mixed riparian woodlands are diverse habitats that support numerous plant species that can include grasses, annual and perennial forbs, vines, shrubs, and trees. A variety of plants creates a complex layering of understory and overstory which in turn provides habitat to numerous wildlife species. When found within the bed, channel, or bank of any river, stream, or lake, riparian vegetation is also protected under Section §1602 of the CFGC; and the CDFW has included riparian communities in the CNDDB. Riparian woodland habitat is present within and surrounding East Branch Green Valley Creek, which lies just outside the project site. Dominant plant species observed within the riparian woodland community on the project site include Italian ryegrass (Festuca perennis), mugwort (Artemisia douglasiana), cattail (Typha spp.), giant reed (Arundo donax), mulefat (Baccharis salicifolia), willows (Salix exigua, S. laevigata, and S. losiolepis), and Fremont cottonwood (Populus fremontii). Wildlife Corridors Wildlife corridors are habitats that provide connectivity between natural communities otherwise separated by urbanization and other development. Wildlife corridors prov ide access for animals to travel between these communities for seasonal migration, access to overwintering/summering habitat, breeding, etc. They also allow animals a route to move away from natural disasters and other forms of habitat loss, as well as to recolonize habitats previously extirpated. Wildlife corridors provide opportunities to breed, forage, migrate/emigrate, disperse, and forage. The proposed project will not interfere with the movement of native wildlife. This project is located along a narrow strip of shoulder along Diablo Road and within non-native annual grassland. Although East Branch Green Valley Creek functions as a wildlife corridor and is immediately adjacent to the project site, the creek itself and its function will not be blocked or impeded by the proposed project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 31 Special-Status Plants Figure 4.4-1, Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site provides a graphical illustration for special-status plant species occurrences within 3 miles of the project site. Table 4.4-1, Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site provides an assessment of potential to occur of special-status plant species on the project site. Twenty-one (21) special-status plants have been previously documented within 3 miles of the project site (CNDDB 2021; CNPS 2021); however, no plants have been observed or mapped onsite. Sequoia analyzed the potential to occur for these plant species, as well as species included in CNPS and IPaC resource lists during the desktop review (Table 4.4-1). A number of these species require specialized habitats such as cismontane woodland, chaparral, rocky areas, and alkaline soils that are not found on the project site. Table 4.4-1: Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence Arctostaphylos auriculata Mt. Diablo manzanita 1B.3 Occurs in sandstone chaparral and cismontane woodland at elevations of 440 to 2,135 feet MSL. Blooms from January through March. None. no suitable habitat occurs on the project site. Arctostaphylos manzanita ssp. laevigata Contra Costa manzanita 1B.2 Occurs in rocky chaparral at elevations of 1,410 to 3,610 feet MSL. Blooms from January through March. None. no suitable habitat occurs on the project site. Calochortus pulchellus Mt. Diablo fairy lantern 1B.2 Occurs in chaparral, cismontane woodland, riparian woodland, and valley and foothill grassland at elevations of 95 to 2,755 feet MSL. Blooms from April through June. None. No suitable habitat occurs on the project site. Campanula exigua chaparral harebell 1B.2 Occurs in rocky, usually serpentinite soils within chaparral at elevations of 900 to 4,100 feet MSL. Blooms from May through June. None. No suitable habitat occurs on the project site. Centromadia parryi ssp. congdonii Congdon's tarplant 1B.1 Occurs in valley and foothill grassland at elevations of 0 to 754 feet. Blooms from May through October. None. No suitable habitat occurs on the project site. Delphinium californicum ssp. interius Hospital Canyon larkspur 1B.2 Occurs in chaparral, cismontane woodland, and coastal scrub. Blooms from April through June. None. No suitable habitat occurs on the project site. Dirca occidentalis western leatherwood 1B.2 Occurs in mesic soils within Broad leafed upland forest, closed cone coniferous forest, chaparral, cismontane woodland, North Coast coniferous forest, riparian forest, and riparian woodland at elevations of 80 to 1,395 feet MSL. Blooms from January through March. None. No suitable habitat occurs on the project site. Eriogonum truncatum Mt. Diablo buckwheat 1B.1 Occurs in sandy soils in within chaparral, coastal scrub, and valley and foothill grassland at elevations of None. No suitable habitat occurs on the project site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 32 Table 4.4-1: Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence 5 to 1,150 feet MSL. Blooms from April through September. Eryngium jepsonii Jepson’s coyote thistle 1B.2 Occurs in clay soils within valley and foothill grassland and vernal pools at elevations of 5 to 985 feet MSL. Blooms from April through August. None. No suitable habitat occurs on the project site. Extriplex joaquinana San Joaquin spearscale 1B.2 Occurs in alkaline soils within chenopod scrub, meadows and seeps, playas as well as valley and foothill grassland at elevations of 3 to 2,739 feet. Blooms from April through October. None. No suitable habitat occurs on the project site. Fritillaria liliacea fragrant fritillary 1B.1 Often occurs in serpentinite soils within cismontane woodland, coastal prairie, coastal scrub and valley and foothill grassland at elevations of 10 to 1,345 feet. Blooms from February through April. None. No suitable habitat occurs on the project site. Hesperolinon breweri Brewer’s western flax 1B.2 Occurs in chaparral, cismontane woodland and valley and foothill grassland, usually serpentinite soils, at elevations of 95 to 3,100 feet MSL. Blooms from May through July. None. No suitable habitat occurs on the project site. Malacothamnus hallii Hall’s bushmallow 1B.2 Occurs in chaparral and coastal scrub at elevations of 30 to 2,495 feet MSL. Blooms from May through September. None. No suitable habitat occurs on the project site. Monolopia gracilens woodland wooly threads 1B.2 Occurs in serpentinite soils within broadleafed upland forest (openings), chaparral (openings), cismontane woodland, North Coast coniferous forest (openings), and valley and foothill grassland at elevation of 325 to 3,935 feet MSL. Blooms from March through July. None. No suitable habitat occurs on the project site. Navarretia nigelliformis ssp. radians shining navarretia 1B.3 Occurs in cismontane woodland, valley and foothill grassland, and vernal pools, sometimes in clay soils, at elevations of 210 to 3,280 feet MSL. Blooms from April through July. None. No suitable habitat occurs on the project site. Phacelia phacelioides Mt. Diablo phacelia 1B.2 Occurs in rocky areas, chaparral, and cismontane woodland. Blooms from April through May. None. No suitable habitat occurs on the project site. Sanicula saxatilis rock sanicle 1B.2, CR Occurs in rocky, scree, talus within broadleafed upland forest, chaparral, and valley and foothill grassland at elevations of 2,030 to 3,855 feet MSL. Blooms from April through May. None. No suitable habitat occurs on the project site. Strepthanthus hispidus Mt. Diablo jewelflower 1B.3 Occurs in chaparral, rocky areas, valley and foothill grasslands. Blooms from March through June. None. No suitable habitat occurs on the project site. Stuckenia northern slender 2B.2 Occurs in marshes and swamps None. No suitable habitat DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 33 Table 4.4-1: Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence filiformis ssp. aplina pondweed (assorted shallow freshwater). Blooms from May through July. occurs on the project site. Triquetrella californica coastal triquetrella 1B.2 Occurs in coastal bluff scrub and coastal scrub at elevations of 30 to 330 feet MSL. None. No suitable habitat occurs on the project site. Viburnum ellipticum oval-leaved viburnum 2B.3 Occurs in chaparral, cismontane woodland, and lower montane coniferous forest at elevations of 705 to 4,595 feet. Blooms from May through June. None. No suitable habitat occurs on the project site. Key to status: FT=Federally listed as threatened species CE=California listed as endangered species CNPS Rare Plant Rank 1A=Plants presumed extirpated in California, and either rare or extinct elsewhere 1B=Pants rare, threatened, or endangered in California, or elsewhere 2A=Plants presumed extirpated in California but common elsewhere 2B=Plants rare, threatened, or endangered in California but more common elsewhere 3=Plants about which more information is needed Note: CNPS ranks below 3 were excluded from this analysis. Special-Status Animals Special status animal species include those listed as threatened or endangered or candidates for listing under the FESA or CESA, State Species of Special Concern (as designated by the California Department of Fish and Wildlife); and other rare species, including those on the “Special Animals List” as maintained by CDFW. Plant and animal species were evaluated for their potential to occur within United States Geological Survey Quadrangle maps that intersect the project area for federally protected species and within a 3-mile radius for species observations from CNDDB. Eleven (11) special-status animal species have been previously documented (CNDDB occurrences) within 3 miles. These species were analyzed for the potential to occur of the project site, as well as species included in Calfish, Pisces, NMFS, and IPaC resource lists. A number of these species require specialized habitat, such as vernal pools, rocky streams, and scrub, that are not found on the project site. Due to lack of suitable habitat and/or lack of recent occurrences in the project vicinity, six (6) special-status animal species are not expected to occur. Descriptions and potential for occurrence of the remaining five (5) species are included in more detail in Table 4.4-2, Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site including: • pallid bat • Townsend’s Big-eared Bat • Foothill Yellow-Legged Frog • California Red-Legged Frog • western pond turtle DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 FIGURE 4.4-1: Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site Diablo Road Trail June 2021 Figure 6. Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site. Source: Sequoia Ecological Consulting, Inc. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 35 Table 4.4-2: Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrences Mammals Antrozous pallidus pallid bat SSC Occurs in deserts, grasslands, shrublands, woodlands, and forest. Most common in open, dry, habitats with rocky area for roosting. Roost must protect bats from high temperatures. Very sensitive to disturbance of roosting sites. Unlikely. Marginal roosting habitat occurs on the project site. Preconstruction surveys will be conducted; see text. Corynorhinus townsendii Townsend's big- eared bat SSC Have been found in a diverse array of communities, including but not limited to, evergreen forests, mixed riparian forests, agricultural areas and coastal habitats. Distribution is most strongly correlated with proximity to roosting habitats in rock cavities and caves. Unlikely. Low potential to forage within project site. Preconstruction surveys will be conducted; see text. Vulpes macrotis mutica San Joaquin kit fox FE, CT Occurs in annual grasslands or open stages with scattered shrubby vegetation. Requires loose sandy textured soils for burrowing. None. No suitable habitat occurs on the project site. Birds Sterna antillarum browni California least tern FE, CE, FP Occurs and nests along coastal, sandy, open areas usually around bays, estuaries, and creek and river mouths. None. No suitable habitat occurs on the project site. Amphibians/Reptiles Ambystoma californiense California tiger salamander FT, CT, SSC Occurs in vernal and seasonal pools and associated grasslands, oak savanna, woodland, and coastal scrub. Needs underground refuges (i.e., small mammal burrows, pipes) in upland areas such as grassland and scrub habitats. None. No suitable habitat occurs on the project site. Rana draytonii California red- legged frog FT, SSC Occurs in semi-permanent or permanent water at least two feet deep, bordered by emergent or riparian vegetation, and upland grassland, forest, or scrub habitats for aestivation and dispersal. None. No suitable habitat occurs on the project site. Emys marmorata western pond turtle SSC Occurs in rivers, ponds, and freshwater marshes, and nests in upland areas (sandy banks or grassy open fields) up to 1,640 feet from water. None. No suitable habitat occurs on the project site. Masticophis Alameda FT, CT A fast-moving, diurnal predator; None. No suitable habitat occurs DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 36 Table 4.4-2: Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrences lateralis erymanthus whipsnake actively hunts with head held high. Limited range, mostly in Alameda and Contra Costa counties, utilizing chaparral, scrub, and rocky outcrops as core habitat. Also uses surrounding woodlands and grassland for foraging and dispersal. on the project site. Rana boylii foothill yellow- legged frog west/central coast clade: CE Found in rocky streams and rivers with rocky substrate and open, sunny banks in forests, woodlands, and chaparral. May also occur in isolated pools and vegetated backwaters. None. No suitable habitat occurs on the project site. Fish Hypomesus transpacificus delta smelt FT, CE Endemic to Sacramento-San Joaquin Delta and its tributaries extending west to Suisun and San Pablo bays. None. No suitable habitat occurs on the project site. Invertebrates Branchinecta lynchi vernal pool fairy shrimp FT Occurs in vernal pools. Endemic to the grasslands of the Central Valley, Central Coast mountains, and South Coast mountains. None. No suitable habitat occurs on the project site. FE=Federally listed as endangered species FT=Federally listed as threatened species FC=Federally listed as a candidate species for listing CE=California listed as endangered species CT=California listed as threatened species FP=California listed as fully protected SSC=California species of special concern Figure 4.4-2, Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site provides a graphical illustration for special-status animal species occurrences within 3 miles of the project site. Wetlands and Waters of the U.S and State The eastern portion of the project site features undulating topography located within regularly grazed non-native annual grassland. The topography generally slopes from south to north throughout this part of the site, with the Magee Cattle Ranch property upslope and Diablo Road downslope from the project. Water from sheet flow runoff and direct precipitation converges at topographic low points between multiple hill peaks, before being conveyed by natural swales and drainage-like features. The extent of these features is limited to several swales and alluvial features that intersect with the project site; however, several drainages with incised channels are present in the vicinity but fall outside of and upslope from the project footprint, within the adjacent Magee Cattle Ranch property. The western portion of the project site is located along DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 FIGURE 4.4-2: Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site Diablo Road Trail June 2021 Figure 7. Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site. Source: Sequoia Ecological Consulting, Inc. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 38 the shoulder of Diablo Road and its topography is consistent with the road alignment. East Branch Green Valley Creek, a perennial waterway and blueline stream, lies directly south of the westernmost portion of the proposed Project. A portion of East Branch Green Valley Creek (PD1) is located just outside the southern boundary of the project site but within the study area; the extent of PD1 within the study area is approximately 0.689-acre. This feature is a perennial drainage characterized by a deeply incised channel, with a clearly defined bed and bank, and abrupt banks. The creek contained flowing water and in-channel pools at the time of the survey, and indicators of ordinary high water mark (OHWM) were observed. One aquatic resource was identified in the project study area during the December 2021 delineation: perennial drainage. Details on this aquatic resource is summarized in Table 4.4-3. Potentially Jurisdictional Aquatic Resources Delineated in the Study Area, and potential regulatory jurisdiction over this feature is discussed below. Table 4.4-3: Potentially Jurisdictional Aquatic Resources Delineated in the Study Area Feature Name Area (ft2) Length (ft) Acre(s) Avg Width (ft) Sample Point Bed/Bank/ OHWM Hydrology Cowardin Class Latitude, Longitude Potential USACE and State Jurisdiction PD1 30,012 - 0.689 50 - Yes, All Perennial Riverine 37.83480, -121.96689 Based on current guidance (EPA 2008; 2021), the perennial drainage (PD1) delineated in the study area would presumably qualify as “Non-navigable tributaries of traditional navigable waters that are relatively permanent where the tributaries typically flow year-round or have continuous flow at least seasonally (e.g., typically three months)” and therefore fall under U.S Army Corps of Engineers (USACE) jurisdiction. On April 2, 2019, the State Water Resources Control Board (SWRCB) adopted a State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State (Procedures), for inclusion in the Water Quality Control Plan for Inland Surface Waters and Enclosed Bays and Estuaries and Ocean Waters of California. The Procedures took effect May 28, 2020. The Procedures consist of four major elements: (1) a wetland definition; (2) a framework for determining if a feature that meets the wetland definition is a water of the state; (3) wetland delineation procedures; and (4) procedures for the submittal, review and approval of applications for Water Quality Certifications and Waste Discharge Requirements for dredge or fill activities. Aquatic resources (such as ephemeral tributaries, some drainage ditches, and isolated wetlands), which may be exempt from federal jurisdiction under the Navigable Waters Protection Rule would likely be considered waters of the State under the Porter-Cologne Water Quality Control Act and/or the Procedures that took effect May 28, 2020. Based on the Procedures, the perennial drainage within the study area would also likely qualify as “Waters of the State” subject to jurisdiction by the SWRCB. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 39 Work, such as placement of fill material, occurring within USACE jurisdiction normally requires a permit under Section 404 of the federal CWA. In addition, the USACE, under Section 401 of the federal CWA, is required to meet state water quality regulations prior to granting a Section 404 permit. This is accomplished by application to the local Regional Water Quality Control Board (RWQCB) for Section 401 certification that requirements have been met. Streams, rivers, and lakes up to the top of bank or dripline of riparian vegetation (whichever is greater) also fall within the jurisdiction of the California Department of Fish and Wildlife (CDFW). Work within CDFW jurisdiction requires a Streambed Alteration Agreement. Town of Danville Tree Preservation Ordinance The Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) requires acquisition of a Tree Removal Permit prior to removal of certain trees within the City Limits. A Tree Removal Permit for tree removal is required if the tree(s) are on the Town’s list of protected, heritage, and/or memorial trees, as defined below: Protected Trees: Any of the following native trees having a single trunk or main stem 10 inches or greater in diameter or multiple trunk trees with tree trunks totaling 20 inches in diameter, measured 4.5 feet above natural grade: • Blue oak (Quercus douglasii) • California bay (Umbellularia californica) • California black oak (Quercus kelloggii) • California buckeye (Aesculus californica) • California sycamore (Platanus racemosa) • Canyon live oak (Quercus chrysolepis) • Coast live oak (Quercus agrifolia) • Interior live oak (Quercus wislizenii) • Madrone (Arbutus menziesii) • London plane tree (Plantanus acerifolia) • Valley oak (Quercus lobata) • White alder (Alnus rhombifolia) Heritage Trees: Any single trunked tree, regardless of species, which has a trunk diameter of 36 inches or greater, measured 4.5 feet above natural grade. Multi-trunk trees are not considered heritage trees therefore no permit would be required. Memorial Trees: A tree planted on public property in memory of or commemoration of an individual or individuals. Removal of any protected, heritage, and/or memorial trees, as defined in the Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) would require acquisition of a Tree Removal Permit. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 40 a) Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special status species in local or regional plans, policies, or regulations, or by the California Department of Fish and Game or U.S. Fish and Wildlife Service? Less Than Significant With Mitigation Incorporated. No special-status plant species are expected to occur on the project site due to regular disturbance (e.g., immediate proximity to busy thoroughfare, mowing, grazing) and lack of specialized habitats and/or substrates such species require. In addition, no special-status plant species were detected during surveys conducted in the spring and winter of 2021. The project site may provide marginally suitable habitat for two special-status bat species, pallid bat and Townsend’s big-eared bat. Furthermore, the project site may provide suitable nesting habitat for migratory birds and raptors. Construction disturbance will be temporary, and implementation of the MM BIO-1 and MM BIO-2 would minimize any impacts on migratory birds and special-status bat species. Indirect impacts may result from the loss of nesting habitat; however, replanting of vegetation would minimize impacts on potential nesting habitat (trees) within the vicinity. Therefore, through implementation of MM BIO-1 and MM BIO-2 impacts to special-status bat species and nesting birds would be reduced to a less than significant level. b) Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, regulations or by the California Department of Fish and Game or US Fish and Wildlife Service? Less Than Significant With Mitigation Incorporated. The bed, bank, and channel and associated riparian vegetation of East Branch Green Valley Creek are subject to CDFW jurisdiction under Section 1600 of California Fish and Game Code (CFGC). In addition, areas within the riparian corridor and below top-of-bank may be regulated by RWQCB. Accordingly, prior to any impacts to the bed, bank, and/or channel and associated riparian vegetation/canopy of East Branch Green Valley Creek, authorization from CDFW/RWQCB shall be required prior to project commencement. Impacts would be mitigated to a level considered less than significant with implementation of MM BIO-3 and MM BIO-4. c) Have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological? Less Than Significant Impact With Mitigation Incorporated. As described above, one potentially jurisdictional aquatic resource has been identified in the project study area: PD1, a 0.689-acre perennial drainage characterized by a deeply incised channel, with a clearly defined bed and bank, and abrupt banks. Retaining walls would be constructed to avoid encroachment to the East Branch Green Valley Creek , as shown in Figure 3: Proposed Project, The trail alignment would encroach on PD1 up to 150 sq ft. Mitigation for this impact would be completed at a ratio determined by permits obtained with Mitigation Measures BIO-3 and BIO-4.Through the implementation of project design measures, applicable permits, and DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 41 implementation of Mitigation Measures BIO-3 and BIO-4, the proposed project would result in less than significant impacts with mitigation incorporated. d) Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? Less Than Significant With Mitigation Incorporated. This project site does not currently provide a movement corridor for any wildlife species, nor does it provide nursery sites for any species. As discussed above, the proposed project is located along a narrow strip of shoulder along Diablo Road and within non-native annual grassland. Although East Branch Green Valley Creek functions as a wildlife corridor and is immediately adjacent to the project site, the creek itself and its function will not be blocked or impeded by the proposed project. The proposed project would not interfere with the movement of any native resident or migratory fish or wildlife species or migratory wildlife corridor or impede the use of wildlife nursery sites. Impacts to “Waters of the State” on the project site would generally be avoided (refer to Section 4.4 (c). The proposed project alignment would be located at grade level, and therefore, would not substantially obstruct wildlife movement. The nests of all the native bird species are protected under the federal MBTA and California Fish and Game Code. Impacts to nesting birds and special-status bat species would be mitigated through implementation of MM BIO-1 and BIO-2. Therefore, impacts as a result of the proposed project would be less than significant with mitigation incorporated. e) Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance? Less Than Significant Impact With Mitigation Incorporated. Vegetation and tree removal would be required to construct the trail and would include the removal of native trees and non-native trees. However, the trail alignment is designed to avoid the removal of protected or heritage trees. The project would result in the removal of trees determined by the Arborist Report (See Appendix B) to be in poor condition, as well as trees that cannot be avoided. Trees in poor condition are not typically considered a reliable specimen for preservation due to a stunted or declining canopy, poor foliar color, possible disease, or insect issues and can include severe structural defects that may or may not be correctable. Further, the Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) requires acquisition of a Tree Removal Permit prior to removal of certain trees within the City Limits. The tree removal permit would ensure tree replacement at a specific ratio to mitigate loss of trees. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 42 Design measures to avoid resources and tree removal permits would ensure that the proposed project would not conflict with local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance. Implementation of MM BIO-5 would require protected trees to be replanted at ratios consistent with tree protection requirements and impacts would be less than significant. f) Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? No Impact. The proposed project is not located within any Natural Community Conservation Plan or Habitat Conservation Plan. Thus, the proposed project would not conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Plan, or other approved local, regional, or State habitat conservation plan. Therefore, the proposed project would have no impact. Mitigation Measures MM BIO-1: Migratory Birds and Raptors/Nest Avoidance. Tree and vegetation clearing (removal, pruning, trimming, and mowing) shall be scheduled to occur outside the migratory bird nesting season (February 1 through August 31). However, if clearing and/or construction activities will occur during the migratory bird nesting season, then preconstruction surveys to identify active migratory bird and/or raptor nests shall be conducted by a qualified biologist within 14 days of construction initiation on the project site and within 300 feet (i.e., zone of influence) of project-related activities. The zone of influence includes areas outside the project site where birds could be disturbed by construction-related noise or earth-moving vibrations. If active nest, roost, or burrow sites are identified within the project site, a no-disturbance buffer shall be established for all active nest sites prior to commencement of any proposed project-related activities to avoid construction or access-related disturbances to migratory bird nesting activities. A no- disturbance buffer constitutes a zone in which proposed project-related activities (e.g., vegetation removal, earth moving, and construction) cannot occur. A minimum buffer size of 50 feet for passerines and 300 feet for raptors will be implemented; sizes of the buffers shall be determined by a qualified biologist based on the species, activities proposed near the nest, and topographic and other visual barriers. Buffers shall remain in place until the young have departed the area or fledged and/or the nest is inactive, as determined by the qualified biologist. If work is required within a buffer zone of an active bird nest, work may occur under the supervision of a qualified avian biologist. The qualified avian biologist monitoring the construction work will DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 43 have the authority to stop work and adjust buffers if any disturbance to nesting activity is observed. MM BIO-2: Roosting Bats. A qualified biologist shall be hired to conduct surveys for special- status bats (pallid bat and Townsend’s big-eared bat) no more than two weeks prior to planned commencement of construction activities that have the potential to disturb bat day roosts or maternity roosts through elevated noise levels or removal of trees. If a visual survey is not sufficient to determine the presence/absence of bats, acoustic equipment (e.g., AnaBat) shall be used to determine potential occupancy type of species present. If an active maternity roost is detected, a qualified biologist shall determine an appropriate avoidance buffer to be maintained from April 1 until young are flying (typically through August). If an active day roost is detected in a tree or structure planned for removal, or within a zone of influence (i.e., noise, vibration) that could result in roost abandonment, as determined by a qualified biologist, the bats shall be safely evicted under the guidance of a qualified biologist. Day roosts shall not be removed unless the daytime temperature is at least 50 degrees Fahrenheit and there is no precipitation. Mitigation for day roosts impacted by the project will be achieved through the installation of bat houses on-site to replace lost roosts at a 1:1 ratio. Replacement roosts will be placed at the discretion of the qualified biologist. MM BIO-3 Obtain CDFW Section 1600 Lake or Streambed Alteration Agreement. If project activities encroach on the riparian zone of East Branch Green Valley Creek, the project proponent shall submit a Section 1600 Notification of Lake or Streambed Alteration application to CDFW. The Notification will include a description of impacts, including quantification of impacts to bed, bank, and channel, as well as individual trees, area and linear footage of riparian vegetation, and proposed mitigation for impacts. It is likely that CDFW will require tree replacement mitigation compensation as a condition of the Lake or Streambed Alteration Agreement. Accordingly, the applicant proposes to mitigate for any impacts to native trees greater than 4 inches in diameter at breast height (DBH) via on-site replacement at a 3:1 (replacement to impacts) ratio. This tree replacement mitigation proposal to compensate for the project’s potential encroachment into the riparian canopy will likely satisfy mitigation requirements stipulated by CDFW. In consideration of overall project site aesthetics, replacement trees shall be planted near East Branch Green Valley Creek to contribute to the existing riparian canopy associated with this waterway. The trees’ health shall be monitored annually for 5 years by a qualified biologist or arborist and documented in annual monitoring reports. At the end of the 5- DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 44 year monitoring period, at least 70 percent of planted trees shall be in good health. If survival is below 70 percent, additional trees shall be planted to bring the total number of planted trees up to 100 percent of the original number of trees planted. Irrigation and follow-up monitoring shall be established over an additional 3-year period following any replanting. MM BIO-4 Obtain RWQCB Waste Discharge Requirements Permit and US Army Corps of Engineers Section 404 Permit. If project activities encroach on areas, including the riparian zone and canopy of East Branch Green Valley Creek and below top- of-bank, or other areas potentially regulated by the RWQCB or USACE, the project proponent shall submit a report of Waste Discharge in order to obtain WDRs, and/or file a completed federal National Pollutant Discharge Elimination System (NPDES) permit application form with the San Francisco Bay RWQCB, and/or obtain a permit under Section 404 of the federal Clean Water Act, as appropriate. In addition, the project proponent shall develop a SWPPP that will be submitted to the Town of Danville as a condition of project approval demonstrating BMPs that shall be installed/implemented prior to project commencement. Stormwater protection and treatment measures shall be implemented to ensure that the proposed project remains in compliance with the Porter-Cologne Act and that discharges of dredged or fill material do not enter waters of the State. MM BIO-5 Tree Protection. Some trees on the project site are subject to the Town of Danville’s Tree Preservation Ordinance. At least 90 days prior to project initiation, a Tree Removal Application shall be submitted to the Town for review and for acquisition of a Tree Removal Permit, if required. The Town will consider the following criteria upon receipt of the application and prior to issuing a permit: 1. The condition of the tree with respect to its health, imminent danger of falling, proximity to existing structures, and interference with utility infrastructure; 2. The necessity to remove the tree to allow for the reasonable use, enjoyment, or development of the property; 3. The age and size of the protected tree with regard to the appropriate size of the area in which the tree is planted, and if removal would encourage healthy, more vigorous growth of other plant materials in the area; 4. Planning Commission may authorize removal if the tree is unreasonably adversely impacting the use of the property. Mitigation would be required; 5. The effect of the removal in relation to soil erosion and surface water flow; DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 45 6. The number of species, size, and location of other protected trees in the area and the effect of the removal as it pertains to shade, privacy between properties, and scenic beauty of the area; 7. Possible visual impacts within a Town-identified Major Ridgeline or Scenic Hillside Area. To compensate for the removal of any trees protected by the Town of Danville’s Tree Protection Ordinance, the applicant shall ensure the protection (i.e., health and safety) of trees to be retained and provide mitigation for trees authorized by the Town for removal. The applicant shall be required to replace on-site the Town-protected trees to be removed in accordance with the Preservation Ordinance and Tree Removal Permit. If tree mitigation planting cannot be accommodated on the project site, mitigation may be handled through the payment of an in-lieu fee, which shall be made payable to the Town of Danville. In-lieu mitigation funds received by the Town may be applied to an account chosen by the Town to allow the purchase and planting of trees (e.g., beautification trees) within the Town of Danville. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 46 4.5 Cultural Resources ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Cause a substantial adverse change in the significance of a historical resource pursuant to in § 15064.5? X b) Cause a substantial adverse change in the significance of an archaeological resource pursuant to § 15064.5? X c) Disturb any human remains, including those interred outside of dedicated cemeteries? X The following section is summarized from the Archaeological Survey Report (ASR)8 prepared for the proposed project (Appendix C). a) Cause a substantial adverse change in the significance of a historical resource pursuant to in § 15064.5? No Impact. An archival and records search was conducted within a 0.25-mile buffer area around the Project Area of Potential Impact (API) by staff at the Northwest Information Center (NWIC) of the California Historical Resources Information System (CHRS) at Sonoma State University. The archival and records search revealed that no cultural resources have been previously recorded within the API or the 0.25-mile records search buffer. Two prior cultural resources studies encompassed portions of the API and no additional studies were identified within the 0.25-mile buffer. Details for both studies are presented in Table 4.5-1, Prior Cultural Resource Studies Associated with the Project Area. 8 Pacific Legacy, Inc. (2022). Phase I Archaeological Survey Letter Report for the Diablo Road Trail Project, Danville, Contra Costa County, California. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 47 Table 4.5-1: Prior Cultural Resource Studies Associated with the Project Area. Study Number Title Author Year Type S-038908 Magee Ranch, Archaeological Survey and Subsurface Testing Report, Contra Costa County, California Wilberg, Randy S. 2011 Archaeological, Excavation, Field Study Cultural Resources Study of the Magee Ranch Property, Danville, Contra Costa County, California (letter report) Holman, Miley Paul 2009 Archaeological, Excavation, Field Study Cultural Resources Assessment Report, Magee Ranch Project, Town of Danville, Contra Costa County, California Bulger, Teresa D., Thomas Young, and Nazih Fino 2015 Archaeological, Field Study COE_2014_1209_001, Section 106 Consultation for the Summerhill Homes in Danville, Contra Costa County, California (COE #2011-00044S) Polcano, Julianne and Jane M. Hicks 2016 OHP Correspondence S-048919 Cultural Resources Inventory for the Diablo Country Club Recycled Water Project, Contra Costa County, California Sikes, Nancy E., Cindy J. Arrington, and Dylan Stapleton 2016 Archaeological, Field Study Historical Resources Evaluation Report For The Diablo Country Club Recycled Water Project, Diablo, Contra Costa County, California Daly, Pamela 2016 Architectural/historical, Evaluation, Field Study S-038908 involved archaeological excavation and survey of the Magee Ranch Property, which is bound on the north by Diablo Road. Archaeological survey was conducted within the project’s API, but excavation activities took place elsewhere. No archaeological resources were identified during this study. S-048919 partially overlaps a small portion of the western end of the project’s API. The study involved archaeological survey and a historic-built environment survey and evaluation. Two historic period resources associated with the Diablo Country Club Golf Course, P-07-004768 and P-07-004769 were identified. Neither resource is within 0.25 miles of the project’s API. As a result, there would be no impact to historical resources and no mitigation is required. b) Cause a substantial adverse change in the significance of an archaeological resource pursuant to § 15064.5? Less Than Significant With Mitigation Incorporated. As described in Response 4.5a) above, records searches revealed that two cultural resource studies had been previously conducted within the project area. Both of the studies produced negative results for archaeological resources. No cultural resources have been previously recorded within 0.25 miles of the API. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 48 Construction activities for the project would include excavation and grading. Therefore, there is the potential for the project to affect previously unidentified archaeological resources during ground disturbing activities. In order to avoid direct impacts to archaeological resources, Mitigation Measures CUL-1 through CUL-3 would ensure archaeological resources that may be found on the site are properly identified and protected. With inclusion of these measures, potential project impacts would be reduced to a less than significant level. c) Disturb any human remains, including those interred outside of dedicated cemeteries? Less Than Significant with Mitigation Incorporated. No known human remains occur on site. In the event that previously unknown human remains are encountered during earth removal or disturbance activities, the project would be required to comply with California Health and Safety Code Section 7050.5 and PRC as set forth in MM CUL-3. Potential impacts concerning human remains would be less than significant. Mitigation Measures MM CUL‐1 Prior to initiating ground disturbing activities within the project area, construction personnel should be alerted to the possibility of encountering buried prehistoric or historic period cultural remains. Personnel should be advised that upon discovery of buried archaeological deposits, work in the immediate vicinity of the find should cease and a qualified archaeologist should be contacted immediately. Once the find has been identified, plans for the treatment, evaluation, and mitigation of impacts to the find shall be developed if it is found to be eligible for the National Register of Historic Places or the California Register of Historical Resources. MM CUL‐2 Archaeological resources unearthed by project construction activities shall be evaluated by a qualified archaeologist and Native American monitor. If the resources are Native American in origin, the tribe shall coordinate with the jurisdiction regarding treatment of these resources. The treatment plan established for the resources shall be in accordance with CEQA Guidelines Section 15064.5(f) for historical resources and PRC Section 21083.2(b) for unique archaeological resources. Preservation in place (i.e., avoidance) shall be the preferred manner of treatment. If preservation in place is not feasible, treatment may include implementation of archaeological data recovery excavations to remove the resource along with subsequent laboratory processing and analysis; provided no data recovery will be permitted to tribal cultural resources without prior consultation and consent of the Middletown. MM CUL-3 California Health and Safety Code Section 7050.5, State CEQA Guidelines Section 15064.5, and PRC Section 5097.98 mandate the process to be followed in the event of an accidental discovery of any human remains in a location other than a dedicated cemetery. California Health and Safety Code Section 7050.5 requires DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 49 that in the event that human remains are discovered, disturbance of the site shall be halted until the coroner has investigated the circumstances, manner and cause of death, and the recommendations concerning the treatment and disposition of the human remains have been made to the person responsible for the excavation, or to his or her authorized representative, in the manner provided in PRC Section 5097.98. If the coroner determines that the remains are not subject to his or her authority and if the coroner recognizes or has reason to believe the human remains to be those of a Native American, he or she shall contact, by telephone within 24 hours, the Native American Heritage Commission. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 50 4.6 Energy Pacific Gas and Electric Company (PG&E) is the energy utility provider in the City Town of Danville, furnishing both natural gas and electricity for residential, commercial, industrial, and municipal uses. PG&E generates or buys electricity from hydroelectric, nuclear, renewable, natural gas, and coal facilities. In 2018, natural gas facilities provided 15 percent of PG&E’s electricity delivered to retail customers; nuclear plants provided 34 percent; hydroelectric operations provided 13 percent; renewable energy facilities including solar, geothermal, and biomass provided 39 percent.F 9 MCE Clean Energy (MCE) is an alternative electricity provider available to the City Town of Danville residents. It offers residents the option to have 60 percent to 100 percent of their electricity supplied from clean and renewable resources. This option is available to all current PG&E electric customers. MCE electricity is produced from renewable sources such as solar, wind, geothermal, hydroelectric, and bioenergy.10 a) Result in potentially significant environmental impact due to wasteful, inefficient, or unnecessary consumption of energy resources, during project construction or operation? Less Than Significant Impact. PG&E provides electricity and natural gas service to the project area. The proposed project would enhance pedestrian and bicycle safety and increase 9 Pacific Gas and Electric. (2022). Exploring Clean Energy Solutions. Retrieved from: https://www.pge.com/en_US/about- pge/environment/what-we-are-doing/clean-energy-solutions/clean-energy- solutions.page?WT.mc_id=Vanity_cleanenergy. Accessed January 5, 2022. 10 MCE Clean Energy. (2022). Retrieved from: https://www.mcecleanenergy.org/. Accessed January 5, 2022. ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Result in potentially significant environmental impact due to wasteful, inefficient, or unnecessary consumption of energy resources, during project construction or operation? X b) Conflict with or obstruct a state or local plan for renewable energy or energy efficiency? X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 51 connectivity and mobility. The project would not result in an increase in electricity and natural gas demand. Therefore, projected electrical and natural gas demand would not significantly impact PG&E’s level of service. During construction, transportation energy use depends on the type and number of trips, vehicle miles traveled, fuel efficiency of vehicles, and travel mode. Transportation energy use during construction would come from the transport and use of construction equipment, delivery vehicles and haul trucks, and construction employee vehicles that would use diesel fuel and/or gasoline. The use of energy resources by these vehicles would fluctuate according to the phase of construction and would be temporary. Most construction equipment during site preparation and grading would be gas-powered or diesel-powered, and the later construction phases would require electrically-powered equipment. Impacts related to transportation energy use during construction would be temporary and would not require expanded energy supplies or the construction of new infrastructure; impacts would be less than significant. During operations, energy consumption associated with the trail and pedestrian and bicycle roadway would be nominal. Furthermore, gasoline fuel facilities and infrastructure already exists in the surrounding area. Consequently, the proposed project would not result in a substantial demand for energy that would require expanded supplies or the construction of other infrastructure or expansion of existing facilities. The proposed project would not result in wasteful, inefficient, or unnecessary consumption of energy resources. Therefore, there would be a less than significant impact. b) Conflict with or obstruct a state or local plan for renewable energy or energy efficiency? Less Than Significant Impact. The proposed project would enhance pedestrian and bicyclist safety and increase connectivity and mobility. The project would further promote alternative modes of transportation and reduce vehicle trips. The project would develop a trail and a pedestrian and bicycle roadway, and therefore would not generate any new automobile traffic or require energy use. Additionally, as discussed further in Threshold 4.8 (b), the proposed project would be consistent with the California Air Resources Board (CARB) Scoping Plan measures as well as the overall goals of the City Town of Danville Climate Action Plan and Contra Costa Climate Action Plan. Although these documents are the strategic planning document to reduce GHG emissions in the City Town and Contra Costa County, the reduction in GHG emissions would occur by providing alternative transportation options, which reduces vehicle fuel consumption. The proposed project would not conflict with any strategies for renewable energy or energy efficiency. Therefore, impacts would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 52 4.7 Geology and Soils ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact a) Directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving: i) Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. X ii) Strong seismic ground shaking? X iii) Seismic-related ground failure, including liquefaction? X iv) Landslides? X b) Result in substantial soil erosion or the loss of topsoil? X c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? X d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 53 ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? X f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? X The following section is summarized from the Preliminary Geohazards Study11 prepared for the proposed project (Appendix D). The proposed trail project is located along a portion of Diablo Road adjacent to Green Valley Creek. Diablo Road within the project limits is located at the edge of a relatively flat alluvial plain, which extends northward towards the base of Mount Diablo. Immediately south of Diablo Road, East Branch Green Valley Creek has incised approximately 18 feet vertically into the alluvial plain. The creek banks can be characterized as having near vertical slopes and significant erosional scarps, especially along outer bends of the creek channel. On the opposite bank of Green Valley Creek, a large spur ridge extends approximately 200 feet vertically from the creek bottom at a 2:1 (horizontal:vertical) slope. Groundwater was encountered at 23 feet during the geotechnical investigation. In general, the creek banks along East Branch Green Valley Creek consist of Tassajara-Green Valley Formation bedrock. Bedrock of the Tassajara-Green Valley Formation typically consists of weakly indurated sandstone, siltstone, and claystone with thin beds of pebble conglomerate. Alluvial deposits are also present along terraced areas of the creek bed. The alluvium generally consist of silty clay with interbedded clayey sand. There are areas of over steepened creek bank and localized areas of sloughing on or along portions of the creek bank adjacent to where the trail is proposed and some active landsliding was noted on the opposite bank. Surficial soil underlying the trail alignment appears to consist of clayey material. The clayey soil found in the project site vicinity is typically expansive. Expansive soil shrinks and swells as a result of seasonal fluctuation in moisture content. This can cause heaving and cracking of slabs- 11 Engeo. (2022). Preliminary Geohazards Study. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 54 on-grade, pavements, and structures founded on shallow foundations. Damage due to volume changes associated with expansive soil can be reduced through proper foundation design. Soil creep is a natural process that involves slow downhill movement of soil mantle on a slope. Soil creep consists of lateral extension and vertical settlement. Soil creep results when surficial expansive soil is subjected to wetting and drying cycles caused by seasonal moisture changes, precipitation, and/or long-term landscape irrigation; by the growth of roots; and by burrowing animals. The amounts of vertical and horizontal movement are a function of the soil physical characteristics, such as plasticity, height and gradient of the downhill slope, and the depth of wetting and drying cycles. Improvements constructed on or near downhill slopes will be impacted by soil creep. a) Directly or indirectly cause potential substantial adverse effects, including the risk of loss, injury, or death involving: i.Rupture of a known earthquake fault, as delineated on the most recent Alquist-Priolo Earthquake Fault Zoning Map issued by the State Geologist for the area or based on other substantial evidence of a known fault? Refer to Division of Mines and Geology Special Publication 42. ii.Strong seismic ground shaking? iii.Seismic-related ground failure, including liquefaction? iv.Landslides? Less Than Significant Impact. The Alquist‐Priolo Earthquake Fault Zoning Act (1972) and the Seismic Hazards Mapping Act (1990) direct the State Geologist to delineate regulatory "Zones of Required Investigation" to reduce the threat to public health and safety and to minimize the loss of life and property posed by earthquake‐triggered ground failures. Cities and counties affected by the zones must regulate certain development "projects" within them. Earthquake hazard zones define areas subject to three distinct types of geologic ground failures: (1) fault rupture, where the surface of the earth breaks along a fault; (2) liquefaction, in which the soil temporarily turns to quicksand and cannot support structures; and (3) earthquake‐induced landslides. The project site is not in a Zone of Required Investigation.7F 12 The project site is not within an Alquist-Priolo fault zone.8F 13 No known surface fault traverses the site. Therefore, the potential for surface rupture due to faulting occurring beneath the site is considered low. Thus, the proposed project would not have any impacts in relation to a rupture of a known earthquake fault as delineated on the most recent Alquist-Priolo Earthquake Fault Map. 12 California Department of Conservation. (2019). California Earthquake Hazard Zone Application. Retrieved from https://maps.conservation.ca.gov/cgs/EQZApp/app/. Accessed June 15, 2022. 13 Ibid. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 55 Contra Costa County, as well as most of the greater San Francisco Bay area, is in a region of high seismic activity. Ground shaking originating from earthquakes along active faults in the region is expected to induce lower horizontal accelerations due to smaller anticipated earthquakes and/or greater distances to other faults. The design and construction of the project would meet the applicable standards established during final engineering. Compliance with the standard conditions would ensure that project implementation would result in a less than significant impact associated with seismic activity. Soil liquefaction is a condition where saturated, granular soils undergo a substantial loss of strength and deformation due to pore pressure increase resulting from cyclic stress application induced by earthquakes. In the process, the soil acquires mobility sufficient to permit both horizontal and vertical movements if the soil mass is not confined. Soils most susceptible to liquefaction are saturated, loose, clean, uniformly graded, and fine‐grained sand deposits. If liquefaction occurs, foundations resting on or within the liquefiable layer may undergo settlements. This would result in reduction of foundation stiffness and capacities. The proposed project would be required to be in conformance with the California Building Code and other applicable standards. Conformance with standard engineering practices and design criteria would reduce the effects of ground failure to a less than significant level. The potential for landslides and seismically induced slope failures at or near the project site would be minimized with adherence to Standard Condition (SC)-1, SC-2, and SC-3, which require the project to which meet the seismic building standards required in the most recent, adopted edition of the California Building Code, obtain a grading permit, and comply with the applicable recommendations from the Geotechnical Investigation and other applicable Municipal Code requirements. Therefore, project implementation would result in less than significant impacts associated with the exposure of people or structures to potential substantial adverse effects involving landslides and no mitigation is required. b) Result in substantial soil erosion or the loss of topsoil? Less Than Significant Impact. Grading would be required to construct some segments of the trail and grading and earthwork activities during construction would expose soils to potential short‐term erosion by wind and water. Because the project would disturb more than one acre, a SWPPP would be developed in accordance with the NPDES General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities (NPDES General Construction Permit)(Order No. 2009-0009-DWQ, NPDES No. CAS000002) (California State Water Resources Control Board (SWRCB) 2009). The SWPPP would identify BMPs that would be implemented to prevent soil erosion during construction and to stabilize the site at the end of construction. Additionally, the project would include recommendations from the Geohazards Study (See Appendix D) such as soil reinforcement to minimize movement of expansive soils underneath the trail towards the direction of the creek bank, particularly under saturated DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 56 conditions. These requirements would ensure that potential project impacts are less than significant. c) Be located on a geologic unit or soil that is unstable, or that would become unstable as a result of the project, and potentially result in on- or off-site landslide, lateral spreading, subsidence, liquefaction or collapse? Less Than Significant Impact. Lateral spreading is a potential hazard commonly associated with liquefaction where extensional ground cracking and settlement occur as a response to lateral migration of subsurface liquefiable material. These phenomena typically occur adjacent to free faces such as slopes and creek channels. The proposed project would be required to be in conformance with the latest version of the California Building Code and other applicable standards. Conformance with SC-1, SC-2, SC-3, standard engineering practices and design criteria would reduce the effects of ground failure to a less than significant level. d) Be located on expansive soil, as defined in Table 18-1-B of the Uniform Building Code (1994), creating substantial direct or indirect risks to life or property? Less Than Significant Impact. Expansive soils can change in volume depending on moisture content. When wet, these soils can expand; conversely, when dry, they can contract or shrink. Sources of moisture that can trigger this shrink‐swell phenomenon can include seasonal rainfall, landscape irrigation, utility leakage, and/or perched groundwater. Expansive soil can exhibit wide cracks in the dry season, and changes in soil volume have the potential to damage concrete slabs, foundations, and pavement. The project would include recommendations from the Geohazards Study (See Appendix D) such as soil reinforcement to minimize movement of expansive soils underneath the trail towards the direction of the creek bank, particularly under saturated conditions. The project would also include buried rock toe protection in areas where the retaining walls are proposed. The depth of the retaining walls and soil reinforcement would provide substantial footing to reinforce the retaining walls. Thus, adherence to all construction and project design features would ensure impacts are less than significant. e) Have soils incapable of adequately supporting the use of septic tanks or alternative waste water disposal systems where sewers are not available for the disposal of waste water? No Impact. The project does not propose the use of septic tanks. Therefore, no impact would occur and no mitigation is required. f) Directly or indirectly destroy a unique paleontological resource or site or unique geologic feature? Less Than Significant with Mitigation Incorporated. Paleontological resources are the fossilized remains of organisms from prehistoric environments found in geologic strata. These resources are valued for the information they yield about the history of the earth and its past ecological settings. The potential for fossil occurrence depends on the rock type exposed at the surface in a given area. Typically, paleontological resources are found within alluvium deposits. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 57 According to the Danville 2030 General Plan, consulting with a suitably qualified paleontologist or geologist if it is known, or determined, that fossils, or geological features of high scientific value are, or may be, present on land that will be developed. The Town will require consultation with a paleontologist if vertebrate fossils are uncovered during site excavation. Although not anticipated, the potential to encounter paleontological resources during subsurface construction activities associated with the project, such as grading and trenching, still exists. If the project were to encounter paleontological resources, the project could potentially result in a significant impact to paleontological resources. Accordingly, implementation of Mitigation Measure GEO‐1 is recommended to reduce potential impacts to paleontological resources that may be discovered during project construction. With the incorporation of mitigation, impacts associated with paleontological resources would be less than significant. Standard Conditions and Requirements SC GEO‐1: Prior to issuance of a building permit, all construction shall meet the seismic building standards required in the most recent, adopted edition of the California Building Code. SC GEO‐2: Prior to issuance of a building permit, a grading permit shall be obtained, subject to review and approval by the Town of Danville pursuant to the most recent, adopted edition of the California Building Code and jurisdictional grading standards. SC GEO‐3: Prior to the issuance of grading permits, the Town shall review all project plans for grading, foundation, structural, infrastructure, and all other relevant construction permits to ensure compliance with the applicable recommendations from the Geotechnical Investigation and other applicable Municipal Code requirements. Mitigation Measures MM GEO‐1: If during the course of project construction, paleontological resources are accidentally discovered during construction, work shall be halted within 20 feet of the find until a qualified professional paleontologist can evaluate it. Work shall not recommence until the project paleontologist has submitted documentation to the Town indicating that discovered resources have been adequately salvaged and no further resources have been identified within the area of disturbance. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 58 4.8 Greenhouse Gas Emissions ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment? X b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases? X Unlike emissions of criteria and toxic air pollutants, which have local or regional impacts, emissions of greenhouse gases (GHGs) that contribute to global climate change have a broader global impact. Global climate change is a process whereby GHGs accumulating in the atmosphere contribute to an increase in the temperature of the earth’s atmosphere. The principal GHGs contributing to global climate change are carbon dioxide (CO2), methane (CH4), nitrous oxide (N2O), and fluorinated compounds. These gases allow visible and ultraviolet light from the sun to pass through the atmosphere, but they prevent heat from escaping back into space. Among the potential implications of global climate change are rising sea levels, and adverse impacts to water supply, water quality, agriculture, forestry, and habitats. In addition, global climate change may increase electricity demand for cooling, decrease the availability of hydroelectric power, and affect regional air quality and public health. Like most criteria and toxic area pollutants, much of the GHG production comes from motor vehicles. GHG emissions can be reduced to some degree by improved coordination of land use and transportation planning on the city, county and sub regional level, and other measures to reduce automobile use. Energy conservation measures can also contribute to reductions in GHG emissions. The BAAQMD CEQA Guidelines, recommend that all GHG emissions from a project be estimated, including a project’s direct and indirect GHG emissions from operations. Because the proposed project is a trail project and would not generate any vehicle trips, the proposed project is not expected to generate GHG emissions and would not conflict with any plan related to the reduction of GHG emissions. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 59 The BAQQMD does not have an adopted Threshold of Significance for construction-related GHG emissions. However, BAAQMD recommends that the Lead Agency quantify and disclose GHG emissions that would occur during construction and decide on the significance of these construction generated GHG emission impacts in relation to meeting AB 32 GHG reduction goals. The Lead Agency is encouraged to incorporate BMPs, such as recycling at least 50 percent of construction waste or demolition materials, to reduce GHG emissions during construction, as applicable. a) Generate greenhouse gas emissions, either directly or indirectly, that may have a significant impact on the environment? Less Than Significant Impact. Construction GHG emissions were estimated using CalEEMod. For the purpose of this environmental analysis, project construction is expected to occur over an approximately ten-month period. Construction activities would include grading, paving, and architectural coating for striping and signage. Project construction would result in direct emissions of CO2, N2O, and CH4 from the operation of construction equipment and the transport of materials and construction workers to and from the project site. Construction GHG emissions are typically summed and amortized over the lifetime of the project (assumed to be 30 years)9F 14. BAAQMD does not have a threshold for construction GHG emissions but recommends that construction GHG emissions are quantified and disclosed. Construction of the project would result in a total of approximately 117 MTCO2e, which is approximately 3.9 MTCO2e/year over the project lifetime (see Appendix A). Operational or long‐term emissions occur over the life of the proposed project. Generally, GHG emissions would result from direct emissions such as project generated vehicular traffic, on‐site combustion of natural gas, operation of any landscaping equipment. Operational GHG emissions would also result from indirect sources, such as off‐site generation of electrical power over the life of the project, the energy required to convey water to, and wastewater from the project site, the emissions associated with solid waste generated from the project site, and any fugitive refrigerants from air conditioning or refrigerators. The proposed project includes an approximately 0.9-mile trail extension and a pedestrian and bicycle roadway which would not include any structures which would provide energy, waste, water, or wastewater emissions. Additionally, no vehicle trips are associated with the project. The project would use a sweeper occasionally to maintain the trail. However, this would generate negligible GHG emissions. Therefore, no GHG emissions are expected to be generated from operation of the proposed project and impacts are less than significant. 14 The project lifetime is based on the standard 30-year assumption of the South Coast Air Quality Management District (South Coast Air Quality Management District, Minutes for the GHG CEQA Significance Threshold Stakeholder Working Group #13, August 26, 2009). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 60 b) Conflict with an applicable plan, policy or regulation adopted for the purpose of reducing the emissions of greenhouse gases? Less Than Significant Impact. In the absence of a regional or Citywide plans for reducing of GHGs, AB 32 was used in this analysis as the basis for determining the level of reductions in GHG emissions that would apply to the project. As additional information becomes available on GHG emissions reduction planning, the City Town may use such information or plans as a basis for evaluating GHG emissions impacts. AB 32 mandates the State to reduce GHG emissions to 1990 levels by 2020 and SB 32 requires a 40 percent reduction below 1990 levels by 2030. To achieve this goal, GHG emissions statewide must be reduced by approximately 30 percent by 2020. The City Town of Danville has a Climate Action Plan (CAP) (2009) which includes various goals about reducing vehicle miles traveled (VMT) and promoting a pedestrian and bicycle -friendly community. Some of the objectives include promoting a walking- and bicycling-friendly community, enhancing an efficient transportation system, and establishing and preserving trees to sequester carbon and reduce urban heating. The preliminary actions identified in the CAP were further explored and built upon in the Town’s 2030 General Plan and Sustainability Action Plan (SAP) concurrently adopted in 2013. The SAP includes measures designed to reduce GHG emissions. The project would be consistent with the applicable SAP goals and measures by creating a safer, more connected, and enhanced bicycle network in Danville. In addition, the proposed project would comply with all BAAQMD applicable rules and regulations during construction and would not interfere with the State’s goals of reducing GHG emission to 1990 levels by 2020 as stated in AB 32; a 40 percent reduction below 1990 levels by 2030 as noted in SB 32; and, an 80 percent reduction in GHG emissions below 1990 levels by 2050 as stated in EO S-3-05. Therefore, the proposed project would have a less than significant impact on GHG emissions. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 61 4.9 Hazards and Hazardous Materials ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials? X b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? X c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school? X d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment? X e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard or excessive noise for people residing or working in the project area? X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 62 ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact f) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan? X g) Expose people or structures, either directly or indirectly, to a significant risk of loss, injury or death involving wildland fires? X Kimley-Horn performed a regulatory database search of the Department of Toxic Substances Control Envirostor website (http://www.envirostor.dtsc.ca.gov/public/) and the State Water Resources Control Board's (SWRCB) Geotracker website (http://geotracker.waterboards.ca.gov/) on January 10, 2022 to identify hazardous material regulated facilities within or proximate to the project site. Kimley-Horn’s review of the referenced databases also considered the potential or likelihood of contamination from adjoining and nearby sites. To evaluate which of the adjoining and nearby sites identified in the regulatory database search present an environmental risk to the subject property, Kimley-Horn considered the following criteria: • The topographic position of the property relative to the subject property; • The direction and distance of the identified facility from the subject property; • Local soil conditions in the subject property area; • The known and/or inferred groundwater flow direction and depth in the subject property area; • The status of the respective regulatory agency-required investigations and/or cleanup associated with the identified facility; and • Surface and subsurface obstructions and diversions (e.g., buildings, roads, sewer systems, utility service lines, rivers, lakes, and ditches) located between the identified site and the subject property. Only those sites that are judged to present a potential environmental risk to the subject property and/or warrant additional clarification are further evaluated. Using the referenced criteria and based upon a review of readily available information contained within the regulatory database search, Kimley-Horn did not identify adjoining (i.e., bordering) or nearby DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 63 sites (e.g., properties within a 0.25-mile radius) listed in the regulatory database report that were judged to present a potential environmental risk to the subject property. Other Potential Hazards Other hazards that have the potential to impact the proposed project are wildland fire hazards and hazardous materials transported on nearby roadways. These potential hazards are further discussed below. Chapter 4.10, Hydrology and Water Quality, discusses potential hazards related to dam failure and flooding. Wildland Fire Hazards Wildfires are large-scale brush and grass fires in undeveloped areas. Wildfires are often caused by human activities, such as equipment use and smoking, and can result in loss of valuable wildlife habitat, soil erosion, and damage to life and property. The level of wildland fire risk is determined by a number of factors, including: • Frequency of critical fire weather; • Percentage of slope; • Existing fuel (vegetation, ground cover, building materials); • Adequacy of access to fire suppression services; and • Water supply and water pressure. The California Department of Forestry and Fire Protection (CAL FIRE) has mapped the relative wildfire risk in areas of large population by intersecting residential housing density with proximate fire threat according to three risk levels, namely Moderate, High, and Very High. These risk levels are determined based on vegetation density, adjacent wildland Fire Hazard Severity Zone (FHSZ) scores and distance from wildland area. Each area of the map gets a score for flame length, embers and the likelihood of the area burning. The Town of Danville is categorized as a Local Responsibility Area (LRA) by CAL FIRE. The project site is mapped as non- very high FHSZ (https://osfm.fire.ca.gov/media/5776/danville.pdf accessed on January 20, 2022). However, Figure 22 in Danville’s 2030 General Plan designates the project site area as “Very High Threat to Development” and “Extreme Threat to Development”. Airport Proximity There are no private airstrips or public airports located immediately adjacent to or near the project site. The closest airport to the project site is Buchanan Field Airport, approximately 11.5 miles north of the project site. Division of Oil, Gas and Geothermal Resources Map According to California Department of Conservation records available online, the project site is not within or near the administrative boundary of an oil field DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 64 (https://www.conservation.ca.gov/calgem/Pages/Wellfinder.aspx, accessed January 10, 2022) and there are no active oil or natural gas wells within 1 mile of the project site. a) Create a significant hazard to the public or the environment through the routine transport, use, or disposal of hazardous materials? Less Than Significant. The proposed project is the construction of a trail to connect existing trail segments within the Town and is not anticipated to result in releases of hazardous materials into the environment. During operations of the proposed project, no routine transport or disposal of hazardous materials would occur. The hazardous materials most likely to be used during construction include typical construction materials such as gasoline, diesel, motor oil, lubricants, solvents, and adhesives. Drips and small spills would be the most likely potential hazardous materials releases to occur, and any release that occurs in close proximity to a stream or drainage channel could have a significant impact on the environment, if not properly controlled. Given the project would disturb over one acre, a SWPPP would be developed and implemented in accordance with the NPDES General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities (NPDES General Construction Permit)(Order No. 2009-0009-DWQ, NPDES No. CAS000002) (SWRCB 2009). Implementation of the SWPPP would reduce the potential for hazardous materials releases to occur during construction and would reduce the potential for spills to impact sensitive habitat or human health, to less than significant. b) Create a significant hazard to the public or the environment through reasonably foreseeable upset and accident conditions involving the release of hazardous materials into the environment? Less Than Significant. Kimley-Horn performed a regulatory database search of the Department of Toxic Substances Control Envirostor website (http://www.envirostor.dtsc.ca.gov/public/) and the State Water Resources Control Board's (SWRCB) Geotracker website (http://geotracker.waterboards.ca.gov/) on January 10, 2022 to identify hazardous material regulated facilities within or proximate to the project site. Kimley-Horn did not identify any environmental concerns for the project site as a result of this database review. In addition, the proposed project is the construction of a trail and accidental release of hazardous materials during the operation of the trail project is not anticipated. Construction activities are also not anticipated to involve any materials or conditions that would result in risk of upset or accident that would release hazardous materials into the environment. Examples of projects that may involve such risk could include refineries, fuel storage, or tanker transportation, where accidents could result in catastrophic environmental or human consequences. The construction activity for this project would not involve such risk or circumstances. Therefore, impacts associated with the accidental release of hazardous materials are less than significant. c) Emit hazardous emissions or handle hazardous or acutely hazardous materials, substances, or waste within one-quarter mile of an existing or proposed school? DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 65 Less Than Significant. There are no schools located within 0.25 mile of the proposed project. The closest school to the proposed project site is the Athenian School located approximately 0.36 mile to the northeast. The project would not emit, transport, or upset hazardous materials, substances or waste near within one -quarter mile of an existing or proposed school. Less than significant impacts are anticipated. d) Be located on a site which is included on a list of hazardous materials sites compiled pursuant to Government Code Section 65962.5 and, as a result, would it create a significant hazard to the public or the environment? No Impact. The project site is not included on the hazardous sites list compiled pursuant to California Government Code Section 65962.5.15. In addition, As described in 4.9 (a) above, review of Envirostor and Geotracker databases identified no sites near the proposed trail alignment. Thus, the proposed project would result in no impacts. e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project result in a safety hazard or excessive noise for people residing or working in the project area? No Impact. The project site is not located within an airport land use plan or within two miles of a public airport or public use airport. The closest airport to the project site is Buchanan Field Airport, approximately 11.5 miles north of the project site. Therefore, given that the proposed project is not located within an airport land use plan or within two miles of an existing airport, the proposed project would not result in a safety hazard for people residing or working in the project area. f) Impair implementation of or physically interfere with an adopted emergency response plan or emergency evacuation plan? No Impact. Implementation of the proposed project would not impair or physically interfere with an adopted emergency response or evacuation plan, including Danville’s Emergency Operations Plan dated March 2017. The purpose of the Emergency Operations Plan is to provide guidance for the Town’s response to emergency situations from natural disasters, technological incidents, and National security emergencies. The Emergency Operations Plan describes procedures for the effective and efficient allocation response to a hazardous materials emergency. It establishes an emergency organization, assigns tasks, specifies policy and general procedures, and provides coordination of planning for all phases of emergency planning for a hazardous materials emergency. No revisions to the adopted Emergency Operations Plan, would be required as a result of implementation of the proposed project. During construction, road access may be disrupted temporarily. Streets and roads affected by 15 California Department of Toxic Substances Control. (2022). DTSC's Hazardous Waste and Substances Site List - Site Cleanup (Cortese List). Retrieved from: https://dtsc.ca.gov/dtscs-cortese-list/. Accessed January 10 ,2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 66 trail construction would be appropriately signed with temporary traffic control measures per Danville’s Engineering standards. After completion of the proposed trail, temporary signage and traffic control measures would be removed. Once operational, the project would connect two existing trail segments, providing another route that could be used by bicyclists and pedestrians in an emergency. Therefore, the proposed project would not impair or interfere with an adopted emergency response plan or evacuation plan. g) Expose people or structures, either directly or indirectly, to a significant risk of loss, injury or death involving wildland fires? Less Than Significant. The Town of Danville is categorized as a Local Responsibility Area (LRA) by CAL FIRE. The project site is mapped as a non-very high fire hazard severity zone (VHFHSZ)16. However, Figure 22 in Danville’s 2030 General Plan designates the project site area as “Very High Threat to Development” and “Extreme Threat to Development”. The proposed project would result in the construction of a trail parallel to Diablo Road and would result in similar uses to existing conditions, largely as a transportation corridor. Given the nature of the project as a trail project, the proposed project would not expose people or structures, either directly or indirectly, to significant loss, injury or death involving wildland fires. Thus, impacts would be less than significant. 16 California Department of Forestry and Fire Protection. (2009). Danville Very High Fire Hazard Severity Zones in LRA. Retrieved from: https://osfm.fire.ca.gov/media/5776/danville.pdf. Accessed January 10, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 67 4.10 Hydrology and Water Quality ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? X b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? X c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: X i. Result in substantial erosion or siltation on- or off-site? X ii. Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite? X iii. Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? X iv. Impede or redirect flood flows? X d) In flood hazard, tsunami, or seiche X DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 68 ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact zones, risk release of pollutants due to project inundation? e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? X The proposed project is located adjacent to the Green Valley Creek, with much of the trail located north of the Green Valley Creek. The project site is along a reach of East Branch Green Valley Creek immediately downstream of the Alameda Diablo Road culvert. Runoff generally converges at topographic low points between multiple hill peaks, before being conveyed by swale- and drainage-like features. East Branch Green Valley Creek, a perennial waterway, lies directly south of the project site. East Branch Green Valley Creek is not listed as an “impaired” water body by a State or Regional Water Board. Once constructed, portions of the proposed trail alignment adjacent to East Branch Green Valley Creek would sheetflow toward Diablo Road and follow the existing drainage pattern. The eastern portion of the alignment would discharge to adjacent permeable areas, non-erodible surfaces, and existing inlets. According to Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps, most of the proposed project is not within a mapped flood plain. The project site is located in Zone “X” of the FEMA Flood Zone Map, defined as areas of minimal flood hazard. Stormwater runoff from the proposed project would be conveyed to adjacent pervious vegetated surface areas. The general NPDES stormwater permits for general construction activities require an applicant to file a NOI with the applicable RWQCB to discharge stormwater and prepare and implement a SWPPP. The SWPPP would include a site map, description of stormwater discharge activities, and BMPs that would be employed to prevent water pollution. The SWPPP for general construction activity permits must describe BMPs that would be used to control soil erosion and discharges of other construction-related pollutants that could contaminate nearby water resources. a) Violate any water quality standards or waste discharge requirements or otherwise substantially degrade surface or ground water quality? Less Than Significant. While much of the proposed trail would occur on existing roadway and disturbed shoulder areas, the proposed project would result in an increase in the amount of DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 69 impervious area as a result of new trail. This could result in a slight increase in flowrates and volumes of stormwater runoff, as compared to existing conditions. The path would generally drain its runoff to adjacent pervious, non-erodible surfaces. However, there are cases where the path would drain directly to impervious, non-erodible surfaces. These cases occur where the path crosses existing roads and existing paved areas on private and public properties, where existing drainage patterns flow to pervious, non-erodible surfaces. The proposed project would be required to comply with Contra Costa County and Town of Danville regulations related to stormwater runoff, including the requirements of the California Regional Water Quality Control Board San Francisco Bay Region Municipal Regional Stormwater NPDES (MRP 2.0) Permit (NPDES Permit Order No. R2 2015-0049). The project would not be subject to Provision C.3 of MRP 2.0 because it meets the criteria described in C.3.a.1.(4)(d)C.3.b.ii.(4)(d), it is an impervious trail built to direct stormwater runoff to adjacent vegetated areas, or other non-erodible permeable areas, preferably away from creeks or towards the outboard side of levees. Thus, the project would be in compliance with these regulations that ensure the long-term operation of the proposed trail would have a less than significant impact on water quality. Construction activities have the potential to disrupt soil and cause erosion and increase sediment runoff. Materials used during construction of paved trails may have chemicals that are potentially harmful to aquatic resources and water quality. Accidents or improper use of these materials could release contaminants into the environment. Additionally, oil and other petroleum products used to maintain and operate construction equipment could be accidentally released. NPDES General Permit for Storm Water Discharges Associated with Construction and Land Disturbance Activities (NPDES General Construction Permit)(Order No. 2009-0009-DWQ, NPDES No. CAS000002) (SWRCB 2009) requires construction sites over one acre that do not qualify for a waiver to prepare and implement a SWPPP. The SWPPP shall incorporate BMPs to control sedimentation and runoff and meet CGP requirements. Compliance with the NPDES Permit is mandated by state and federal laws. Consistent with the CGP, the SWPPP shall adhere to the following requirements: • The SWPPP shall include measures to avoid creating contaminants, minimize the release of contaminants, and water quality control measures to minimize contaminants from entering surface water or percolating into the ground during and following the completion of construction. • The SWPPP shall be submitted to the RWQCB in compliance with the requirements of the CGP. • A spill prevention and countermeasure plan shall be incorporated into the SWPPP. Consistent with the CGP a SWPPP would contain the following protective measures: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 70 • No discharge of pollutants from vehicle and equipment cleaning into any storm drains or watercourses. • Vehicle and equipment fueling and maintenance operations must be located away from watercourses, except at established commercial gas stations or established vehicle maintenance facility or staging areas with BMPs installed and maintained. • Concrete wastes will be collected in washouts and water from curing operations is collected and disposed. Neither will be allowed into watercourses. • Spill containment kits will be maintained onsite at all times during construction operations and/or staging or fueling of equipment. • Dust control measures will include use of water trucks and organic tackifiers to control dust in excavation-and-fill areas, covering temporary access road entrances and exits with rock (rocking) or comparable stabilization techniques, and covering of temporary stockpiles when weather conditions require. Dewatering is not required for the proposed project; however, if dewatering is necessary in areas where groundwater is encountered within the planned depth of excavation, depending on surface and groundwater levels at the time of construction, the dewatering shall be consistent with RWQCB requirements and as such would not result in a violation of water quality standards or waste discharge requirements. Therefore, impacts as a result of the proposed project would be less than significant. b) Substantially decrease groundwater supplies or interfere substantially with groundwater recharge such that the project may impede sustainable groundwater management of the basin? Less Than Significant. The proposed project would not result in the construction of large impervious surface areas that would prevent water from infiltrating into the groundwater nor would it result in direct additions or withdrawals to existing groundwater. As discussed in Section 4.7, Geology and Soils, groundwater was encountered at 23 feet during the geotechnical investigation. A majority of the project will require excavation at depths of 0.5 to 2 feet and dewatering would not be required. Therefore, the proposed project would have a less than significant impact. c) Substantially alter the existing drainage pattern of the site or area, including through the alteration of the course of a stream or river or through the addition of impervious surfaces, in a manner which would: i. Result in substantial erosion or siltation on- or off-site? Less Than Significant. No significant change in either drainage patterns or on-site or off-site effects from erosion and siltation would occur and flows would discharge to adjacent permeable areas, non-erodible surfaces, and existing inlets. Where needed, drainage DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 71 improvements would be installed to capture stormwater and convey it into the existing storm drain systems and channels. These drainage improvements would remain after construction. Minimal alterations to the existing drainage system would result from the proposed project. Further, as described in Section 4.10 (a) above, BMPs would be implemented during construction so that on-site and off-site erosion and sedimentation would be controlled to the extent practicable. Therefore, the proposed project would have a less than significant impact. ii. Substantially increase the rate or amount of surface runoff in a manner which would result in flooding on- or offsite? Less Than Significant. As described in Section 4.10 (a) and (c (i)), no substantial change in either drainage patterns or flooding on-or off-site would occur as a result of the proposed project. Implementation of the proposed project would not alter the existing drainage patterns. The proposed trail would require new impervious surfaces to be constructed which increase surface runoff, but it would not be substantial enough to result in flooding as a majority of the trail runoff would be discharged to adjacent non-erodible permeable areas. In some locations, the proposed project would perpendicularly and longitudinally cross existing ditches. A cross culvert or series of junction boxes and culverts would be installed to continue to convey flows similar to existing conditions. During construction, BMPs identified in the SWPPP would be implemented so that on-site and off-site erosion and sedimentation would be controlled to the extent practicable. Therefore, this impact would be less than significant. iii. Create or contribute runoff water which would exceed the capacity of existing or planned stormwater drainage systems or provide substantial additional sources of polluted runoff? Less Than Significant. Refer to response 4.10 (a), (c (i)), and (c (ii)) above. iv. Impede or redirect flood flows? Less Than Significant. According to FEMA Flood Insurance Rate Maps, the proposed project is within areas mapped as “Areas of Minimal Flood Hazard” mapped flood plain. In addition, since there are no bridge footings proposed, the project would not result in flood water displacement. Retaining walls would not be installed in a location or manner that would impede or redirect flood flows and flows would continue to sheet flow towards pervious vegetated surfaces. Therefore, flood waters would not be redirected as a result of the proposed project. Thus, impacts as a result of the proposed project would be less than significant. d) In flood hazard, tsunami, or seiche zones, risk release of pollutants due to project inundation? Less Than Significant. Seiches are caused when earthquake ground motions cause water to oscillate from one side to the other of a closed or partially closed body of water such as a lake, bay or channel. Since no such bodies of water are located in the vicinity of the project site, there is no risk of release of pollutants due to project inundation. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 72 Tsunamis, or seismic tidal waves, are caused by off-shore earthquakes that can trigger large, destructive sea waves. The project site is located approximately 16 miles east of the San Francisco Bay and 14 miles south of the Suisun Bay. Therefore, no impact would occur as a result of tsunamis or seismic tidal waves. Therefore, due to the geographic location of the project, no impacts are likely to occur due to flood hazard, tsunami, or seiche zones. Thus, a less than significant impact would occur. e) Conflict with or obstruct implementation of a water quality control plan or sustainable groundwater management plan? No Impact. Water quality impacts other than those described in response 4.10(a) above are not anticipated with implementation of the proposed project. The proposed project would be required to comply with Contra Costa County and Town of Danville regulations related to stormwater runoff, including compliance with the requirements of the California Regional Water Quality Control Board San Francisco Bay Region Municipal Regional Stormwater NPDES (MRP 2.0) Permit (NPDES Permit Order No. R2 2015-0049), and requirements of the SWPPP and therefore there would be no impact. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 73 4.11 Land Use and Planning ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Physically divide an established community? X b) Cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect? X The project site extends from just east of the intersection of Fairway Drive and Diablo Road to approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road in the Town of Danville. The proposed trail is located entirely within the Town of Danville and passes through public ROW, and private property. The proposed trail would be on the south side and parallel to Diablo Road. The relevant land use and zoning designations from the Town of Danville are included below and further described in the Danville 2030 General Plan. Danville is divided into 24 Planning Subareas. The proposed project is located within Planning Subarea 6 referred to as the Diablo Road/Blackhawk Road subarea. According to the General Plan, land uses along the project alignment are designated as Agricultural and Rural Residential. Corresponding zoning designations include General Agricultural District (A-2) and Agricultural Preserve District (A-4). In 2019, the project site was rezoned to Planned Unit Development District (P-1) with the Magee Preserve project. The P-1 District allows for approximately 302 acres as open space including for the purposes of public trails within the Magee Preserve project limits. As a condition of the Magee Preserve project, a public easement dedication for the proposed trail would be given to the Town. The 2030 General Plan includes goals and policies that encourage and require public access easements for trail use. More specifically, Policy 17.14 states, “Enhance Danville’s trail system by closing gaps in the existing system, providing adequate access points and extending trails to achieve better connectivity to all areas of the town. The trail system should be logical, comprehensive and user friendly and should provide a variety of trail expe riences, including opportunities for exercise, encounters with nature, and social walking. In addition, this DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 74 proposed trail is identified in the Town of Danville Bicycle Master Plan (Spring 2021) and the Danville Townwide Trail Plan (1989) as a new Class I – Shared Use Path. a) Physically divide an established community? No Impact. The physical division of an established community typically refers to the construction of a physical feature (such as an interstate highway or railroad tracks) or removal of a mean of access (such as local road or bridge) that would impair the mobility within an existing community, or between a community and outlying areas. The proposed project would provide a new Class I bicycle and pedestrian trail within public ROW, and on private property easements. The proposed project would not physically divide an established community, and in fact would provide for better connectivity. Therefore, the project would have a less than significant impact. b) Cause a significant environmental impact due to a conflict with any land use plan, policy, or regulation adopted for the purpose of avoiding or mitigating an environmental effect? Less Than Significant. The plans, policies, and regulations applicable to the proposed project include the Danville 2030 General Plan, the Danville Municipal Code, Danville Townwide Trail Plan and Town of Danville Bicycle Master Plan. The proposed project is in direct support of these relevant plans, which contain goals and policies in support of bicycle and pedestrian trails, and specific goals and policies in support of completion of the Diablo Road Trail. Additional relevant policies relate to the protection of natural resources, water quality, cultural resources, visual resources, air quality, and public safety from natural and human-caused hazards, provision of public services, noise and traffic. Many of the project impacts related to these topics are less than significant or are limited to the short-term construction phase of the project as described in the relevant sections of this document. With implementation of the mitigation measures contained in this document, the proposed project is consistent with all of these policies with all the relevant regulations and policies contained in these documents. This impact would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 75 4.12 Mineral Resources ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state? X b) Result in the loss of availability of a locally-important mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? X The State Mining and Reclamation Act of 1972 (SMARA) identifies and protects California’s mineral resources. According to the Town of Danville General Plan, There are no significant mineral deposits or surface mining operations in Danville17. a) Result in the loss of availability of a known mineral resource that would be of value to the region and the residents of the state? No Impact. The proposed project would consist of a bicycle and pedestrian trail and associated improvements. The proposed project is not located in an area known to contain regionally significant mineral resources and would not result in the loss of the availability of a known mineral resource of regional value. Therefore, the proposed project would have no impact. b) Result in the loss of availability of a locally-important mineral resource recovery site delineated on a local general plan, specific plan or other land use plan? No Impact. The project site is not located in an area that has been identified by the Town of Danville as a locally important mineral resource recovery site. Therefore, the proposed project would not result in the loss of the availability of any locally important mineral recovery site. Therefore, the proposed project would have no impact. 17 Town of Danville. (2013). Danville 2030 General Plan. Page 6-6. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 76 4.13 Noise ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? X b) Generation of excessive groundborne vibration or groundborne noise levels? X c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? X Sound is technically described in terms of amplitude (loudness) and frequency (pitch). The standard unit of sound amplitude measurement is the decibel (dB). The decibel scale is a logarithmic scale that describes the physical intensity of the pressure vibrations that make up any sound. The pitch of the sound is related to the frequency of the pressure vibration. Since the human ear is not equally sensitive to a given sound level at all frequencies, a special frequency-dependent rating scale has been devised to relate noise to human sensitivity. The A- weighted decibel scale (dBA) provides this compensation by discriminating against frequencies in a manner approximating the sensitivity of the human ear. Noise is typically defined as unwanted sound. A typical noise environment consists of a base of steady ambient noise that is the sum of many distant and indistinguishable noise sources. Superimposed on this background noise is the sound from individual local sources. These can vary from an occasional aircraft or train passing by to virtually continuous noise from traffic on a major highway. Several rating scales have been developed to analyze the adverse effects of community noise on people. Since environmental noise fluctuates over time, these scales consider that the effect DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 77 of noise on people is largely dependent on the total acoustical energy content of the noise as well as the time of day when the noise occurs. For example, the equivalent continuous sound level (Leq) is the average acoustic energy content of noise for a stated period of time; thus, the Leq of a time-varying noise and that of a steady noise are the same if they deliver the same acoustic energy to the ear during exposure. The Day-Night Sound level (Ldn) is a 24-hour average Leq with a 10 dBA “weighting” added to noise during the hours of 10:00 p.m. to 7:00 a.m. to account for noise sensitivity in the nighttime. The Community Noise Equivalent Level (CNEL) is a 24-hour average Leq with a 10-dBA weighting added to noise during the hours of 10:00 p.m. to 7:00 a.m. and an additional 5 dBA weighting during the hours of 7:00 p.m. to 10:00 p.m. to account for noise sensitivity in the evening and nighttime. The primary existing noise source in the project area is vehicular traffic, including cars, trucks, buses, and motorcycles on roadways near or in the project vicinity, especially along Diablo Road. The level of vehicular noise generally varies with traffic volume, the number of trucks or buses, the speed of traffic, and the distance from the roadway. According to the Danville General Plan existing noise levels for Diablo Road in the project area are between 65-75 LEQ (City Town of Danville, 2013). The proposed project would construct an approximately 0.9-mile trail located along Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 400 feet west of the intersection of Ave Nueva and Diablo Road. The closest residential property line is located approximately 50 feet from the proposed construction area. Local Regulations The proposed project is located the City Town of Danville. The relevant policies and municipal code sections are included below. City Town of Danville Noise Ordinance: Construction noise standards for the City Town require construction activity to occur between 7:30 a.m. and 7:00 p.m. on weekdays and between 9:00 a.m. and 7:00 p.m. on weekends and holidays. Construction activities would be conducted in compliance with the City Town’s Noise Ordinance (section 4-2.3). According to the General Plan Noise Element (2013) exterior noise exposure levels for residential uses is normally acceptable to 60 dB CNEL. a) Generation of a substantial temporary or permanent increase in ambient noise levels in the vicinity of the project in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? Less Than Significant Impact. Construction Noise. Construction noise represents a short-term impact on ambient noise levels. The project would involve minimal construction activities which would be temporary and be short duration resulting in periodic increases in the ambient noise environment. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 78 Construction activities would primarily require the use of excavators, backhoes, pavers, and paving equipment. No pile driving would occur as part of the project. Groundborne noise and other types of construction-related noise impacts typically occur during the initial earthwork phases. Operating cycles for these types of construction equipment may involve one or two minutes of full power operation followed by three to four minutes at lower power settings. Other primary sources of acoustical disturbance would be due to random incidents, which would last less than one minute (such as dropping large pieces of equipment or the hydraulic movement of machinery lifts). It should be noted that as project construction would not use large heavy-duty pieces of construction equipment such as a pile driving, graders, or scrapers, noise levels would be less intense than typical construction projects. Additionally, due to the width of the trail, only one or two small pieces of equipment would be used simultaneously. Since it is a trail project, equipment would move in a linear fashion as opposed to operating adjacent to any one sensitive receptor for an extended period of time. Segments of the trail are bordered by residential uses; with the nearest approximately 50 feet from of the project site. The majority of residences are 100 feet or more from the project site. In addition, construction activities would occur throughout the project site and would not be concentrated at a single point near sensitive receptors. Noise levels typically attenuate (or drop off) at a rate of 6 dB per doubling of distance from point sources, such as industrial machinery. During construction, exterior noise levels could affect the residential neighborhoods near the construction site. Construction activities would be relatively minor and would not produce excessive levels of noise (e.g., replacing construction machinery to be equipped with properly operating noise attenuation devices, designating haul routes away from sensitive receptors, locating staging areas away from receptors) would be required. Construction activities would be limited to daylight hours and equipment would be properly muffled. Compliance with the applicable noise ordinance would ensure that construction noise does not disturb residents during the times they are most likely to be home or during hours when ambient noise levels are likely to be lower (e.g., at night). Therefore, construction noise impacts would be considered less than significant. Operational Noise. The proposed project would not introduce any new uses that would result in an increase of noise levels. The project would enhance pedestrian and bicyclist connectivity and safety. The project would serve existing pedestrians and bicyclists and no uses are proposed that would directly increase vehicular trips in the study area. Additionally, the project has been designed to be a pedestrian-oriented area and does not include any stationary noise sources. The project would include occasional street sweeping and landscape equipment for trail maintenance, however, this would be infrequent and temporary. The street sweeping and landscape equipment would not be substantial alter the existing ambient noise levels. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 79 Therefore, no long-term noise impacts would result with implementation of the proposed project. Operational noise impacts would be less than significant. b) Generation of excessive groundborne vibration or groundborne noise levels? Less Than Significant Impact. Project construction can generate varying degrees of groundborne vibrations, depending on the construction procedure and the construction equipment used. Operation of construction equipment generates vibrations that spread through the ground and diminish in amplitude with distance from the source. The effect on buildings located near a construction site often varies depending on soil type, ground strata, and construction characteristics of the receiver buildings. The results from vibration can range from no perceptible effects at the lowest vibration levels, to low rumbling sounds and perceptible vibration at moderate levels, to slight damage at the highest levels. Groundborne vibrations from construction activities rarely reach levels that damage structures. The Federal Transit Administration (FTA) has published standard vibration velocities for construction equipment operations. In general, the FTA architectural damage criterion for continuous vibrations (i.e., 0.20 inch/second) appears to be conservative. The types of construction vibration impact include human annoyance and building damage. Human annoyance occurs when construction vibration rises significantly above the threshold of human perception for extended periods of time. Building damage can be cosmetic or structural. Typical vibration levels produced by construction equipment is identified in Table 4.13-1. Table 4.13-1: Typical Vibration Levels for Construction Equipment Equipment Approximate peak particle velocity at 25 feet (inches/second)1 Approximate peak particle velocity at 50 feet (inches/second)1 Loaded trucks 0.076 0.030 Small bulldozer 0.003 0.001 Large bulldozer 0.089 0.032 Jackhammer 0.035 0.012 Vibratory compactor/roller 0.210 0.074 Notes: 1. Peak particle ground velocity measured at 25 feet per Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, September 2018. Table 7-4. 2. Calculated using the following formula: PPV equip = PPVref x (25/D)1.5 where: PPV (equip) = the peak particle velocity in in/sec of the equipment adjusted for the distance PPV (ref) = the reference vibration level in in/sec from Table 7-4 of the FTA Transit Noise and Vibration Impact Assessment Manual (2018). D = the distance from the equipment to the receiver. Source: Federal Transit Administration, Transit Noise and Vibration Impact Assessment Manual, September 2018. Groundborne vibration decreases rapidly with distance. As indicated in Table 4.13-1, based on the FTA data, vibrational velocities from typical heavy construction equipment o perations that would be used during project construction range from 0.003 to 0.21 inches per second peak DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 80 particle velocity (PPV) at approximately 25 feet from the source of activity. The closest sensitive receptors would be approximately 50 feet away from active construction zones. Vibration from construction activities experienced at the nearest sensitive residential structures would range between 0.001 and 0.070 inch per second PPV, which is below the 0.20 inch-per-second PPV significance threshold. Therefore, a less than significant impact would occur. Operational use of the project would not generate vibrational impacts. Use of the sidewalks and trails would not generate groundborne vibration that could be felt at surrounding uses. The proposed project would not involve railroads or substantial heavy truck operations, and therefore would not result in vibration impacts at surrounding uses. Impacts would be less than significant. c) For a project located within the vicinity of a private airstrip or an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? No Impact. The nearest airports are the Buchanan Field Airport located approximately 11 miles northwest of the site and the Livermore Municipal Airport located approximately 12 miles southeast of the project site. Therefore, the project would not be exposed to aircraft overflight noise that exceeds noise exposure thresholds. There are no private airstrips within the project site vicinity. No impacts would occur. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 81 4.14 Population and Housing ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Induce substantial unplanned population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? X b) Displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere? X a) Induce substantial unplanned population growth in an area, either directly (for example, by proposing new homes and businesses) or indirectly (for example, through extension of roads or other infrastructure)? No Impact. The proposed project would not involve the construction of in new housing or new businesses. The project consists of the construction of a trail and would not induce substantial unplanned population growth in the area. Therefore, no impact would occur and no mitigation is required. b) Displace substantial numbers of existing people or housing, necessitating the construction of replacement housing elsewhere? No Impact. The project site does not include any existing housing and no housing would be removed to accommodate the proposed project. Therefore, no impacts would occur and no mitigation is required. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 82 4.15 Public Services ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other performance objectives for any of the public services: i) Fire protection? X ii) Police protection? X iii) Schools? X iv) Parks? X v) Other public facilities? X a) Would the project result in substantial adverse physical impacts associated with the provision of new or physically altered governmental facilities, need for new or physically altered governmental facilities, the construction of which could cause significant environmental impacts, in order to maintain acceptable service ratios, response times or other performance objectives for any of the public services: i. Fire protection? ii. Police protection? No Impact. The project would not hinder the fire departments of San Ramon Valley Fire Protection District, the Town of Danville, and the City of Diablo or the police departments of the Town of Danville and the City of Diablo from maintaining acceptable service ratios, levels of effort, response times or other performance objectives given the nature of the project. As DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 83 identified in the project description, the project is a trail that would be constructed adjacent to Diablo Valley Road outside of the travel way. There is a traffic signal with arm to indicate hidden crossings but will not be impacted by construction. The trail will also connect to existing Emergency Vehicle Access (EVA) Road at the west end of the project that will co-align and add access to the Magee Ranch Property. The EVA Road will remain serviceable during construction. No roadways would be completely closed during construction. Therefore, no significant impacts would occur during construction or operation of the project. Implementation of the proposed project would not cause an increase in population, and therefore, service ratios for fire and police services would not be affected. Therefore, impacts to fire and police protection services would be less than significant. iii. Schools? iv. Parks? v. Other public facilities? No Impact. The project does not involve residential development or new employment- generating land uses and would therefore not generate an increase in the Town’s population. No major additional public services would be required to serve the proposed project. Therefore, no impacts to schools, parks, and other public facilities would occur. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 84 4.16 Recreation ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated? X b) Does the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment? X a) Would the project increase the use of existing neighborhood and regional parks or other recreational facilities such that substantial physical deterioration of the facility would occur or be accelerated? No Impact. The project’s primary purpose is to help close a gap in the regional bicycle and pedestrian transportation network, which would provide bicyclists and pedestrians with a safe alternative to connect the multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park, and beyond. Further, the project would run through the traverse across the privately-owned Magee Ranch property, a creek, as well as hilly terrain in a short (but challenging) section, adding pedestrian and bicycle connectivity to the Danville Townwide Trail Master Plan. While the project could induce visitor use of the Mount Diablo State Park by increasing the bicycle and pedestrian connectivity, it is not anticipated that any increased use of the Mount Diablo State Park would result in physical deterioration of the facility. Therefore, the project would not increase the use of existing neighborhoods or regional parks or create a demand for construction of new or expansion of existing recreational facilities. No impacts would occur. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 85 b) Does the project include recreational facilities or require the construction or expansion of recreational facilities which might have an adverse physical effect on the environment? No Impact. The project would not result in the need for construction or expansion of recreational facilities. The proposed project would not materially increase the use of existing neighborhood or regional parks or require the expansion of recreational facilities which may have an adverse effect on the environment. Further, the project would be located within a public Town of Danville Easement dedicated to open and recreational space that will co-align with the existing EVA road on the Magee Ranch property. The added recreational opportunities for active use and connectivity to existing recreational uses, such as trails and parks, as a result of the project would be beneficial to Mount Diablo State Park and community members. Therefore, no impacts would occur. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 86 4.17 Transportation ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Conflict with a program plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? X b) Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)? X c) Substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? X d) Result in inadequate emergency access? X a) Conflict with a program plan, ordinance or policy addressing the circulation system, including transit, roadway, bicycle and pedestrian facilities? Less Than Significant Impact. Implementation of the proposed project would result in the construction of a trail. Short‐term construction trips would include the transfer of construction equipment, construction worker trips, and hauling trips for construction materials; however, impacts in this regard would be temporary in nature and would cease upon project completion. Long‐term operation of the project would not generate vehicle trips that would adversely affect the circulation system; no impacts would occur. No project components would require removal of vehicular lanes such that capacity would be reduced, or that would affect transit service. Therefore, impacts would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 87 b) Would the project conflict or be inconsistent with CEQA Guidelines section 15064.3, subdivision (b)? Less Than Significant Impact. Implementation of the proposed project would enhance pedestrian and bicyclist safety and increase connectivity and mobility. The project would further promote alternative modes of transportation and reduce vehicle trips. The project is not a land use associated with the generation of traffic and no project components would require removal of vehicle lanes such that capacity would be affected. Therefore, impacts are less than significant. c) Substantially increase hazards due to a geometric design feature (e.g., sharp curves or dangerous intersections) or incompatible uses (e.g., farm equipment)? No Impact. The proposed improvements consist of the construction of an off-street paved Class I multi-use path, guard rails, fencing, and retaining walls, and new culverts or culvert extensions. These improvements would provide bicyclists and pedestrians with a safe alternative to using Diablo Road. The trail will help to close a gap between the existing Diablo Road Trail and access to Mount Diablo State Park. The project would introduce safer routes of travel and reduce roadway hazards and not include any incompatible uses. Therefore, no impact would occur. d) Result in inadequate emergency access? Less Than Significant Impact. The proposed project includes construction of an off-street paved Class I multi-use path and would not impact evacuation routes. During construction, access would be maintained on Diablo Road. No roadways would be completely closed during construction. Therefore, impacts to an emergency access would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 88 4.18 Tribal Cultural Resources ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is: i) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k)? X ii) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe? X a) Cause a substantial adverse change in the significance of a tribal cultural resource, defined in Public Resources Code section 21074 as either a site, feature, place, cultural landscape that is geographically defined in terms of the size and scope of the landscape, sacred place, or object with cultural value to a California Native American tribe, and that is: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 89 i) Listed or eligible for listing in the California Register of Historical Resources, or in a local register of historical resources as defined in Public Resources Code section 5020.1(k)? ii) A resource determined by the lead agency, in its discretion and supported by substantial evidence, to be significant pursuant to criteria set forth in subdivision (c) of Public Resources Code Section 5024.1. In applying the criteria set forth in subdivision (c) of Public Resource Code Section 5024.1, the lead agency shall consider the significance of the resource to a California Native American tribe? Less Than Significant with Mitigation Incorporated. Chapter 532 Statutes of 2014 (i.e., Assembly Bill [AB] 52) requires that lead agencies evaluate a project’s potential impact on “tribal cultural resources.” Such resources include “sites, features, places, cultural landscapes, sacred places, and objects with cultural value to a California Native American tribe that are eligible for inclusion in the California Register of Historical Resources or included in a local register of historical resources.” AB 52 also gives lead agencies the discretion to determine, based on substantial evidence, whether a resource qualifies as a “tribal cultural resource.” In compliance with PRC Section 21080.3.1(b), the Town provided formal notification to California Native American tribal representatives identified by the California Native American Heritage Commission (NAHC). Native American groups may have knowledge about cultural resources in the area and may have concerns about adverse effects from development on tribal cultural resources as defined in PRC Section 21074. The Town sent letters to tribal representatives on the NAHC contact list on November 30, 2021. A follow-up email was sent on January 26, 2022. To date, no response has been received from the NAHC. In order to initiate AB 52 consultation, a list of interested Native American stakeholders for Contra Costa County was used that dated to February 24, 2021. This NAHC list was used in lieu of an up-to-date list. When a response is received from the NAHC, the contact lists will be compared, and newly added contacts will be sent requests for consultation. The following persons were identified as potentially having knowledge of the API based on the 2019 list: • Ms. Irenne Zwierlein, Chairperson of the Amah Mutsun Tribal Band of Mission San Juan Bautista; • Mr. Lloyd Mathiesen, Chairperson of the Chicken Ranch Rancheria of Me -Wuk Indians; • Mr. Donald Duncan, Chairperson of the Guidiville Indian Rancheria; • Ms. Kanyon Sayers-Roods, MLD contact for the Indian Canyon Mutsun Band of Costanoan; • Ms. Ann Marie Sayers, Chairperson of the Indian Canyon Mutsun Band of Costanoan; • Ms. Monica Arellano, Chairperson of the Muwekma Ohlone Indian Tribe of the SF Bay Area; DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 90 • Mr. Cosme Valdez, Chairperson of the Nashville Enterprise Miwok-Maidu-Nishinam Tribe; • Ms. Katherine Erolinda Perez, Chairperson of the North Valley Yokuts Tribe; • Timothy Perez of the North Valley Yokuts Tribe; • Mr. Andrew Galvan of The Ohlone Indian Tribe; • Mr. Jesus Tarango, Chairperson of the Wilton Rancheria; • Mr. Steven Hutchason, THPO of the Wilton Rancheria; • Mr. Dahlton Brown, Director of Administration for the Wilton Rancheria; and • Ms. Corrina Gould, Chairperson of The Confederated Villages of Lisjan. A certified letter was sent to each individual on January 8, 2022, from the Town of Danville requesting any information they might have regarding the project API and if they wished to participate in AB 52 consultation. The Wilton Rancheria indicated that they have no concern regarding the project on January 27, 2022. A follow-up email was sent by the Town of Danville to each of the stakeholders on February 4, 2022. No replies have been received to date. There is the potential for ground disturbing activities associated with the project to inadvertently affect previously unidentified Native American tribal cultural resources; therefore, MM TCR-1 and MM TCR-2 have been identified to mitigate this potential impact to Tribal cultural resources. Compliance with the mitigation measures would mitigate potential impacts to tribal cultural resources to a less than significant level. Mitigation Measures MM TCR-1: Prior to initial ground disturbance, the Town shall, in consultation with Tribal Contacts, approve a Tribal Cultural Advisor and the applicant shall ensure that all on-site project personnel shall receive adequate cultural resource sensitivity training developed in collaboration with the project’s Tribal Cultural Advisor or his or her authorized designee. The training shall ensure worker awareness of requirements regarding the protection of tribal cultural resources and the procedures to be implemented in the event that tribal resources are encountered. All training materials related to Tribal cultural resources shall be prepared in collaboration with the project’s Tribal Cultural Advisor or his or her authorized designee and shall be confidential and excluded from public records. MM TCR-2: In the event that unanticipated tribal cultural resources are encountered during ground-disturbing activities, the project Tribal Cultural Advisor shall notify the project applicants by phone and may halt ground disturbance activities in the immediate area of discovery until further evaluation can be made in determining their significance and appropriate treatment or disposition. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 91 4.19 Utilities and Service Systems ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Would the project: a) Require or result in the relocation or construction of new or expanded water, wastewater treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects? X b) Have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? X c) Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments? X d) Generate solid waste in excess of State or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals? X e) Comply with federal, state, and local management and reduction statutes and regulations related to solid waste? X A variety of local and regional purveyors in this area provide and maintain utility and service system facilities associated with electricity, water, stormwater, wastewater, solid water, communications and natural gas. Existing routes of underground gas and water pipelines are underground fiber-optic cables would remain. Utility poles and overhead utility lines that are in DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 92 conflict with the proposed trail alignment would be relocated in coordination with the affected utility provider prior to construction of the proposed project. The proposed trail alignment has been designed to conform to existing grade and provide minimal alteration to existing drainage conditions. Where constrained by property lines, easement or change in grade such that a built-up slope would not be feasible, short retaining structures would be built. a) Require or result in the relocation or construction of new or expanded water, wastewater treatment or storm water drainage, electric power, natural gas, or telecommunications facilities, the construction or relocation of which could cause significant environmental effects? Less Than Significant Impact. Existing storm drain facilities would be maintained as part of the proposed project. The trail crosses an existing 150” CMP, and it will remain at its existing alignment throughout construction. As described above, retaining wall drains or other means would be provided, where needed, to convey stormwater into existing storm d rainage system and channels with minimal alteration to existing drainage patterns. These drainage improvements would remain after completion of the proposed project. The proposed project would not require or result in the construction of new stormwater drainage facilities that could result in significant environmental effects. This impact would be less than significant. The proposed project would not require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities as no potable water and/or toilets would be provided as part of the proposed trail alignment. Therefore, the proposed project would have a less than significant impact. b) Have sufficient water supplies available to serve the project and reasonably foreseeable future development during normal, dry and multiple dry years? No Impact. See 5.19a. c) Result in a determination by the wastewater treatment provider which serves or may serve the project that it has adequate capacity to serve the project’s projected demand in addition to the provider’s existing commitments? No Impact. See 5.19a. d) Generate solid waste in excess of State or local standards, or in excess of the capacity of local infrastructure, or otherwise impair the attainment of solid waste reduction goals? Less Than Significant Impact. Project construction would generate waste including construction materials, trench spoils, and general refuse, and these wastes would need to be disposed of in local or regional facilities. Waste generated from construction would include: non-hazardous metal waste, non-hazardous non-metal waste (concrete rubble, organic waste [vegetation], boxes and crates, refuse from construction workers), and trenching spoils (rubble, soil, broken DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 93 asphalt). Non-hazardous metal and non-metal waste would be hauled to local disposal centers for recycling or taken to landfills. Trenching and excavation spoils would be reused to the maximum extent possible. The disposal demand would be reasonable relative to the solid waste disposal capacities of area landfills. The project would not generate additional waste once completed. Impacts related to solid waste disposal would be considered less than significant. e) Comply with federal, state, and local management and reduction statutes and regulations related to solid waste? No Impact. The proposed project would comply with all federal, State, and local statutes and regulations related to solid waste. Therefore, the proposed project would have no impact. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 94 4.20 Wildfire ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact If located in or near state responsibility areas or lands classified as very high fire hazard severity zones, would the project: a) Substantially impair an adopted emergency response plan or emergency evacuation plan? X b) Due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and thereby expose project occupants to, pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? X c) Require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? X d) Expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes? X According to the LRA map, the majority of the Town of Danville is within a “Non-Very High Fire Hazard Severity Zone” including the project site15F 18. However, Figure 22 in Danville’s 2030 General Plan designates the project site area as “Very High Threat to Development” and “Extreme Threat to Development”. 18 California Department of Forestry and Fire Protection. (2009). Danville Very High Fire Hazard Severity Zones in LRA. Retrieved from https://osfm.fire.ca.gov/media/5776/danville.pdf. Accessed January 10, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 95 a) Substantially impair an adopted emergency response plan or emergency evacuation plan? No Impact. As discussed in Threshold 4.9 (f), the proposed project would not impair or physically interfere with an adopted emergency response or evacuation plan, including the Danville’s Emergency Operations Plan dated March 2017. The project does not include the construction of new roadways or vacation of roadways that would alter the Circulation Plan. The project also does not any service ratios or evacuation routes. Rather, the project would increase multi-modal connectivity, thereby adding a potential benefit for emergency evacuations. Thus, no impact would occur. b) Due to slope, prevailing winds, and other factors, exacerbate wildfire risks, and thereby expose project occupants to, pollutant concentrations from a wildfire or the uncontrolled spread of a wildfire? Less than Significant Impact. The proposed project is zoned as “Non-Very High Fire Hazard Severity Zone” on the CALFIRE Fire Hazard Severity Zones. However, Figure 22 in Danville’s 2030 General Plan designates the project site area as “Very High Threat to Development” and “Extreme Threat to Development”. The proposed project would result in the construction of a trail parallel to Diablo Road and would result in similar uses to the existing conditions, as a transportation corridor. In addition, the 2030 General Plan Goal 25 has incorporated many policies that protect homes and businesses from fire and wildfire and minimize potential losses of life and property. Through consistency with the General Plan goals and policies, the proposed project would not exacerbate wildfire risk. Thus, impacts would be less than significant. c) Require the installation or maintenance of associated infrastructure (such as roads, fuel breaks, emergency water sources, power lines or other utilities) that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment? Less than Significant Impact. The proposed project would be located on the south side of Diablo Road, which is already connected to associated infrastructure. The proposed project would result in the construction of a trail which is an additional transportation corridor. Underground utilities would remain in place and utility relocation is required. No additional or expanded use of water or wastewater facilities are proposed as part of the proposed project. Although the proposed project area is designated as “Very High Threat to Development” and “Extreme Threat to Development”, the project would not require the installation of associated infrastructure that may exacerbate fire risk or that may result in temporary or ongoing impacts to the environment. Thus, impacts would be less than significant. d) Expose people or structures to significant risks, including downslope or downstream flooding or landslides, as a result of runoff, post-fire slope instability, or drainage changes? DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 96 Less than Significant Impact. As discussed above, the project is zoned as “Non-Very High Fire Hazard Severity Zone” on the CALFIRE Fire Hazard Severity Zones. However, Figure 22 in Danville’s 2030 General Plan designates the project site area as “Very High Threat to Development” and “Extreme Threat to Development”. The project site is located in Zone “X” of the FEMA Flood Zone Map, defined as areas of minimal flood hazard. Stormwater runoff from the proposed project would be conveyed to adjacent pervious vegetated surface areas. As described in Section 4.10, Hydrology and Water Quality, Threshold 4.10 (c) above, potential hazards related to downstream flooding are less than significant. Under proposed conditions, on-site surface runoff would sheet flow towards pervious vegetated surfaces. As discussed in Section 4.7, Geology and Soils, Threshold 4.7 (a), the project site is not located within an area susceptible to landslides. The proposed project would be constructed in accordance with the Geotechnical Investigation conducted for the project. Thus, impacts would be less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 97 4.21 Mandatory Findings of Significance ENVIRONMENTAL IMPACTS Issues Potentially Significant Impact Potentially Significant Unless Mitigation Incorporated Less Than Significant Impact No Impact Does the project: a) Have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? X b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? X c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly? X a) Have the potential to substantially degrade the quality of the environment, substantially reduce the habitat of a fish or wildlife species, cause a fish or wildlife population to drop below self-sustaining levels, threaten to eliminate a plant or animal community, substantially reduce the number or restrict the range of a rare or endangered plant or animal or eliminate important examples of the major periods of California history or prehistory? DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 4.0 Diablo Road Trail Final IS/MND Environmental Analysis December 2022 Page 98 Less than Significant Impact. As described in this IS/MND, implementation of the proposed project would occur in the vicinity of special status plants and animals and known and previously undiscovered cultural resources. However, the project has been designed to avoid and minimize the potential for adverse impacts to these resources. The project would occur within a developed corridor for much of its length, and where it would occur in sensitive areas habitat impacts would be avoided by the project design and are minor with respect to the available habitat in the region. Also, the trail would not require excavation into native subgrade in areas of known archeological and cultural resources. Thus through careful design, construction and operation the proposed project would not: 1) degrade the quality of the environment; 2) substantially reduce the habitat of a fish or wildlife species; 3) cause a fish or wildlife population to drop below self-sustaining levels; 4) threaten to eliminate a plant or animal community; 5) reduce the number or restrict the range of a rare or endangered plant or animal; or 6) eliminate important examples of the major periods of California history or prehistory. b) Does the project have impacts that are individually limited, but cumulatively considerable? ("Cumulatively considerable" means that the incremental effects of a project are considerable when viewed in connection with the effects of past projects, the effects of other current projects, and the effects of probable future projects)? Less than Significant Impact. The impacts of the proposed project would be individually limited and not cumulatively considerable. The proposed project would be a multi-use trail and pedestrian and bicycle roadway crossing. All environmental impacts that could occur as a result of the proposed project would be reduced to a less-than-significant level through implementation of the mitigation measures recommended in this IS/MND. c) Does the project have environmental effects which will cause substantial adverse effects on human beings, either directly or indirectly? Less than Significant Impact. As identified throughout this IS/MND, the project would not have significant air quality, noise, traffic, or hazardous materials impacts that might directly or indirectly harm human beings. Therefore, the proposed project would not cause adverse effects on human beings. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 5.0 Diablo Road Trail Final IS/MND References December 2022 Page 99 5.0 REFERENCES California Air Resource Board. 2022. Top 4 Summary: Highest 4 Daily 24-Hour PM2.5 Averages. Retrieved from: https://www.arb.ca.gov/adam/topfour/topfourdisplay.php. Accessed on January 7, 2022. California Department of Conservation. 2022. State of California Important Farmland Map. Retrieved from: https://maps.conservation.ca.gov/DLRP/CIFF/. Accessed January 10, 2022. California Department of Conservation. 2019. California Earthquake Hazard Zone Application. Retrieved from https://maps.conservation.ca.gov/cgs/EQZApp/app/. Accessed June 15, 2022. California Department of Forestry and Fire Protection. 2009. Danville Very High Fire Hazard Severity Zones in LRA. Retrieved from https://osfm.fire.ca.gov/media/5776/danville.pdf. Accessed January 10, 2022. California Department of Toxic Substances Control. 2022. DTSC's Hazardous Waste and Substances Site List - Site Cleanup (Cortese List). Retrieved from: https://dtsc.ca.gov/dtscs-cortese-list/. Accessed: January 10,2022. California Department of Transportation. 2022. List of Eligible and Officially Designated State Scenic Highways. Retrieved from: https://dot.ca.gov/programs/design/lap-landscape- architecture-and-community-livability/lap-liv-i-scenic-highways. Accessed January 14, 2022. California Governor’s Office of Planning and Research. 2022. CEQA Guidelines. Retrieved from: https://opr.ca.gov/ceqa/guidelines/. Accessed January 14, 2022. Contra Costa, County of. 2016. Agricultural Preserves Map. Retrieved from: https://maps.conservation.ca.gov/DLRP/CIFF/. Accessed January 10, 2022. Danville, Town of. 2013. Danville 2030 General Plan. Danville, Town of. 2022. Municipal Code. Engeo. 2022. Preliminary Geohazards Study. MCE. 2022. MCE Clean Energy. Retrieved from: https://www.mcecleanenergy.org/. Accessed January 5, 2022. Pacific Gas and Electric. 2022. Exploring Clean Energy Solutions. Retrieved from: https://www.pge.com/en_US/about-pge/environment/what-we-are-doing/clean- energy-solutions/clean-energy-solutions.page?WT.mc_id=Vanity_cleanenergy. Accessed January 5, 2022. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Section 5.0 Diablo Road Trail Final IS/MND References December 2022 Page 100 Pacific Legacy, Inc. 2022. Phase I Archaeological Survey Letter Report for the Diablo Road Trail Project, Danville, Contra Costa County, California. Sequoia Ecological Consulting. 2022. Aquatic Resources Delineation Report - Town of Danville Diablo Road Trail Project. Sequoia Ecological Consulting. 2022. Biological Resources Report – Town of Danville Diablo Road Trail Project. Traverso Tree. 2022. Tree Inventory & Preliminary Recommendations for Diablo Trail Project, Danville. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Draft IS/MND September 2022 Appendix A Air Quality Data DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Trail Contra Costa County, Summer Project Characteristics - Land Use - Includes 0.9 mile trail + 200 feet of retaining walls + 600 sf of ped/bike path Construction Phase - estimate construction schedule Demolition - no demolition Grading - 115 cy import, 400 cy export Vehicle Trips - no trips Construction Off-road Equipment Mitigation - per BAAQMD dust control measures 1.1 Land Usage Land Uses Size Metric Lot Acreage Floor Surface Area Population Other Asphalt Surfaces 58.82 1000sqft 1.35 58,824.00 0 1.2 Other Project Characteristics Urbanization Climate Zone Urban 4 Wind Speed (m/s)Precipitation Freq (Days)2.2 58 1.3 User Entered Comments & Non-Default Data 1.0 Project Characteristics Utility Company Pacific Gas and Electric Company 2023Operational Year CO2 Intensity (lb/MWhr) 203.98 0.033CH4 Intensity (lb/MWhr) 0.004N2O Intensity (lb/MWhr) Table Name Column Name Default Value New Value tblConstDustMitigation CleanPavedRoadPercentReduction 0 6 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 15 tblConstructionPhase NumDays 10.00 65.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 1 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.0 Emissions Summary tblConstructionPhase NumDays 4.00 20.00 tblConstructionPhase NumDays 10.00 124.00 tblConstructionPhase NumDays 2.00 10.00 tblConstructionPhase PhaseEndDate 6/5/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/8/2023 6/9/2023 tblConstructionPhase PhaseEndDate 5/22/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/2/2023 5/12/2023 tblConstructionPhase PhaseStartDate 5/23/2023 9/1/2023 tblConstructionPhase PhaseStartDate 5/3/2023 5/15/2023 tblConstructionPhase PhaseStartDate 5/9/2023 6/12/2023 tblGrading MaterialExported 0.00 400.00 tblGrading MaterialImported 0.00 115.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 2 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.1 Overall Construction (Maximum Daily Emission) ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year lb/day lb/day 2023 1.3685 14.8992 11.0603 0.0233 7.2236 0.6083 7.8319 3.4623 0.5597 4.0220 0.0000 2,280.234 3 2,280.234 3 0.6542 0.0351 2,307.051 8 Maximum 1.3685 14.8992 11.0603 0.0233 7.2236 0.6083 7.8319 3.4623 0.5597 4.0220 0.0000 2,280.234 3 2,280.234 3 0.6542 0.0351 2,307.051 8 Unmitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year lb/day lb/day 2023 1.3685 14.8992 11.0603 0.0233 3.1603 0.6083 3.7686 1.4997 0.5597 2.0594 0.0000 2,280.234 3 2,280.234 3 0.6542 0.0351 2,307.051 8 Maximum 1.3685 14.8992 11.0603 0.0233 3.1603 0.6083 3.7686 1.4997 0.5597 2.0594 0.0000 2,280.234 3 2,280.234 3 0.6542 0.0351 2,307.051 8 Mitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 56.25 0.00 51.88 56.68 0.00 48.80 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 3 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.2 Overall Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Area 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 0.0000 2.0000e- 005 2.0000e- 005 0.0000 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0000 0.0137 Unmitigated Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Area 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 0.0000 2.0000e- 005 2.0000e- 005 0.0000 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0000 0.0137 Mitigated Operational CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 4 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.0 Construction Detail Construction Phase Phase Number Phase Name Phase Type Start Date End Date Num Days Week Num Days Phase Description 1 Site Preparation Site Preparation 5/1/2023 5/12/2023 5 10 2 Grading Grading 5/15/2023 6/9/2023 5 20 3 Paving Paving 6/12/2023 11/30/2023 5 124 4 Architectural Coating Architectural Coating 9/1/2023 11/30/2023 5 65 OffRoad Equipment Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Graders 1 8.00 187 0.41 Site Preparation Rubber Tired Dozers 1 7.00 247 0.40 Site Preparation Tractors/Loaders/Backhoes 1 8.00 97 0.37 Grading Graders 1 8.00 187 0.41 Grading Rubber Tired Dozers 1 8.00 247 0.40 Grading Tractors/Loaders/Backhoes 2 7.00 97 0.37 Paving Cement and Mortar Mixers 1 6.00 9 0.56 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 3,529 (Architectural Coating – sqft) Acres of Grading (Site Preparation Phase): 9.38 Acres of Grading (Grading Phase): 20 Acres of Paving: 1.35 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 5 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.1 Mitigation Measures Construction Replace Ground Cover Water Exposed Area Reduce Vehicle Speed on Unpaved Roads Clean Paved Roads Paving Pavers 1 6.00 130 0.42 Paving Paving Equipment 1 8.00 132 0.36 Paving Rollers 1 7.00 80 0.38 Paving Tractors/Loaders/Backhoes 1 8.00 97 0.37 Architectural Coating Air Compressors 1 6.00 78 0.48 Trips and VMT Phase Name Offroad Equipment Count Worker Trip Number Vendor Trip Number Hauling Trip Number Worker Trip Length Vendor Trip Length Hauling Trip Length Worker Vehicle Class Vendor Vehicle Class Hauling Vehicle Class Site Preparation 3 8.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Grading 4 10.00 0.00 64.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Paving 5 13.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Architectural Coating 1 5.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 6 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 6.2641 0.0000 6.2641 3.0039 0.0000 3.0039 0.0000 0.0000 Off-Road 1.1339 12.4250 6.6420 0.0172 0.5074 0.5074 0.4668 0.4668 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Total 1.1339 12.4250 6.6420 0.0172 6.2641 0.5074 6.7715 3.0039 0.4668 3.4707 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0230 0.0128 0.1986 5.8000e- 004 0.0657 3.2000e- 004 0.0660 0.0174 3.0000e- 004 0.0177 59.5122 59.5122 1.5100e- 003 1.4300e- 003 59.9751 Total 0.0230 0.0128 0.1986 5.8000e- 004 0.0657 3.2000e- 004 0.0660 0.0174 3.0000e- 004 0.0177 59.5122 59.5122 1.5100e- 003 1.4300e- 003 59.9751 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 7 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 2.6779 0.0000 2.6779 1.2842 0.0000 1.2842 0.0000 0.0000 Off-Road 1.1339 12.4250 6.6420 0.0172 0.5074 0.5074 0.4668 0.4668 0.0000 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Total 1.1339 12.4250 6.6420 0.0172 2.6779 0.5074 3.1853 1.2842 0.4668 1.7509 0.0000 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0230 0.0128 0.1986 5.8000e- 004 0.0623 3.2000e- 004 0.0626 0.0166 3.0000e- 004 0.0169 59.5122 59.5122 1.5100e- 003 1.4300e- 003 59.9751 Total 0.0230 0.0128 0.1986 5.8000e- 004 0.0623 3.2000e- 004 0.0626 0.0166 3.0000e- 004 0.0169 59.5122 59.5122 1.5100e- 003 1.4300e- 003 59.9751 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 8 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 7.0855 0.0000 7.0855 3.4252 0.0000 3.4252 0.0000 0.0000 Off-Road 1.3330 14.4676 8.7038 0.0206 0.6044 0.6044 0.5560 0.5560 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Total 1.3330 14.4676 8.7038 0.0206 7.0855 0.6044 7.6899 3.4252 0.5560 3.9812 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 6.7900e- 003 0.4155 0.1005 1.9300e- 003 0.0560 3.5100e- 003 0.0595 0.0153 3.3600e- 003 0.0187 210.2293 210.2293 6.8600e- 003 0.0333 220.3327 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0287 0.0160 0.2482 7.3000e- 004 0.0822 4.0000e- 004 0.0826 0.0218 3.7000e- 004 0.0222 74.3902 74.3902 1.8900e- 003 1.7800e- 003 74.9688 Total 0.0355 0.4316 0.3487 2.6600e- 003 0.1381 3.9100e- 003 0.1420 0.0371 3.7300e- 003 0.0409 284.6196 284.6196 8.7500e- 003 0.0351 295.3015 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 9 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 3.0291 0.0000 3.0291 1.4643 0.0000 1.4643 0.0000 0.0000 Off-Road 1.3330 14.4676 8.7038 0.0206 0.6044 0.6044 0.5560 0.5560 0.0000 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Total 1.3330 14.4676 8.7038 0.0206 3.0291 0.6044 3.6334 1.4643 0.5560 2.0203 0.0000 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 6.7900e- 003 0.4155 0.1005 1.9300e- 003 0.0534 3.5100e- 003 0.0569 0.0147 3.3600e- 003 0.0181 210.2293 210.2293 6.8600e- 003 0.0333 220.3327 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0287 0.0160 0.2482 7.3000e- 004 0.0779 4.0000e- 004 0.0783 0.0207 3.7000e- 004 0.0211 74.3902 74.3902 1.8900e- 003 1.7800e- 003 74.9688 Total 0.0355 0.4316 0.3487 2.6600e- 003 0.1313 3.9100e- 003 0.1352 0.0355 3.7300e- 003 0.0392 284.6196 284.6196 8.7500e- 003 0.0351 295.3015 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 10 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Off-Road 0.6446 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Paving 0.0285 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.6731 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0374 0.0208 0.3227 9.4000e- 004 0.1068 5.2000e- 004 0.1073 0.0283 4.8000e- 004 0.0288 96.7073 96.7073 2.4600e- 003 2.3200e- 003 97.4595 Total 0.0374 0.0208 0.3227 9.4000e- 004 0.1068 5.2000e- 004 0.1073 0.0283 4.8000e- 004 0.0288 96.7073 96.7073 2.4600e- 003 2.3200e- 003 97.4595 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 11 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Off-Road 0.6446 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 0.0000 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Paving 0.0285 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.6731 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 0.0000 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0374 0.0208 0.3227 9.4000e- 004 0.1012 5.2000e- 004 0.1017 0.0270 4.8000e- 004 0.0274 96.7073 96.7073 2.4600e- 003 2.3200e- 003 97.4595 Total 0.0374 0.0208 0.3227 9.4000e- 004 0.1012 5.2000e- 004 0.1017 0.0270 4.8000e- 004 0.0274 96.7073 96.7073 2.4600e- 003 2.3200e- 003 97.4595 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 12 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Archit. Coating 0.3775 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Total 0.5691 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0144 8.0200e- 003 0.1241 3.6000e- 004 0.0411 2.0000e- 004 0.0413 0.0109 1.8000e- 004 0.0111 37.1951 37.1951 9.5000e- 004 8.9000e- 004 37.4844 Total 0.0144 8.0200e- 003 0.1241 3.6000e- 004 0.0411 2.0000e- 004 0.0413 0.0109 1.8000e- 004 0.0111 37.1951 37.1951 9.5000e- 004 8.9000e- 004 37.4844 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 13 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Archit. Coating 0.3775 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Total 0.5691 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0144 8.0200e- 003 0.1241 3.6000e- 004 0.0389 2.0000e- 004 0.0391 0.0104 1.8000e- 004 0.0106 37.1951 37.1951 9.5000e- 004 8.9000e- 004 37.4844 Total 0.0144 8.0200e- 003 0.1241 3.6000e- 004 0.0389 2.0000e- 004 0.0391 0.0104 1.8000e- 004 0.0106 37.1951 37.1951 9.5000e- 004 8.9000e- 004 37.4844 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 14 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 4.0 Operational Detail - Mobile ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 4.1 Mitigation Measures Mobile 4.2 Trip Summary Information 4.3 Trip Type Information Average Daily Trip Rate Unmitigated Mitigated Land Use Weekday Saturday Sunday Annual VMT Annual VMT Other Asphalt Surfaces 0.00 0.00 0.00 Total 0.00 0.00 0.00 Miles Trip %Trip Purpose % Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Other Asphalt Surfaces 9.50 7.30 7.30 0.00 0.00 0.00 0 0 0 4.4 Fleet Mix Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Other Asphalt Surfaces 0.558086 0.056127 0.180570 0.129764 0.024304 0.005480 0.007016 0.007028 0.000551 0.000343 0.026017 0.001231 0.003481 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 15 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 5.0 Energy Detail ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day NaturalGas Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 NaturalGas Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 5.2 Energy by Land Use - NaturalGas NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr lb/day lb/day Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated 5.1 Mitigation Measures Energy Historical Energy Use: N CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 16 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 6.1 Mitigation Measures Area 6.0 Area Detail ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Mitigated 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Unmitigated 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 5.2 Energy by Land Use - NaturalGas NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr lb/day lb/day Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 17 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory lb/day lb/day Architectural Coating 6.7200e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 0.0208 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.6000e- 004 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Unmitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 18 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 7.1 Mitigation Measures Water 7.0 Water Detail 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory lb/day lb/day Architectural Coating 6.7200e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 0.0208 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.6000e- 004 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 19 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 11.0 Vegetation 8.1 Mitigation Measures Waste 8.0 Waste Detail 9.0 Operational Offroad Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type 10.0 Stationary Equipment Fire Pumps and Emergency Generators Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment Equipment Type Number CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:49 AMPage 20 of 20 Diablo Trail - Contra Costa County, Summer EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Trail Contra Costa County, Winter Project Characteristics - Land Use - Includes 0.9 mile trail + 200 feet of retaining walls + 600 sf of ped/bike path Construction Phase - estimate construction schedule Demolition - no demolition Grading - 115 cy import, 400 cy export Vehicle Trips - no trips Construction Off-road Equipment Mitigation - per BAAQMD dust control measures 1.1 Land Usage Land Uses Size Metric Lot Acreage Floor Surface Area Population Other Asphalt Surfaces 58.82 1000sqft 1.35 58,824.00 0 1.2 Other Project Characteristics Urbanization Climate Zone Urban 4 Wind Speed (m/s)Precipitation Freq (Days)2.2 58 1.3 User Entered Comments & Non-Default Data 1.0 Project Characteristics Utility Company Pacific Gas and Electric Company 2023Operational Year CO2 Intensity (lb/MWhr) 203.98 0.033CH4 Intensity (lb/MWhr) 0.004N2O Intensity (lb/MWhr) Table Name Column Name Default Value New Value tblConstDustMitigation CleanPavedRoadPercentReduction 0 6 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 15 tblConstructionPhase NumDays 10.00 65.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 1 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.0 Emissions Summary tblConstructionPhase NumDays 4.00 20.00 tblConstructionPhase NumDays 10.00 124.00 tblConstructionPhase NumDays 2.00 10.00 tblConstructionPhase PhaseEndDate 6/5/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/8/2023 6/9/2023 tblConstructionPhase PhaseEndDate 5/22/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/2/2023 5/12/2023 tblConstructionPhase PhaseStartDate 5/23/2023 9/1/2023 tblConstructionPhase PhaseStartDate 5/3/2023 5/15/2023 tblConstructionPhase PhaseStartDate 5/9/2023 6/12/2023 tblGrading MaterialExported 0.00 400.00 tblGrading MaterialImported 0.00 115.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 2 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.1 Overall Construction (Maximum Daily Emission) ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year lb/day lb/day 2023 1.3674 14.9264 11.0315 0.0232 7.2236 0.6083 7.8319 3.4623 0.5597 4.0220 0.0000 2,274.151 8 2,274.151 8 0.6544 0.0354 2,301.066 2 Maximum 1.3674 14.9264 11.0315 0.0232 7.2236 0.6083 7.8319 3.4623 0.5597 4.0220 0.0000 2,274.151 8 2,274.151 8 0.6544 0.0354 2,301.066 2 Unmitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year lb/day lb/day 2023 1.3674 14.9264 11.0315 0.0232 3.1603 0.6083 3.7686 1.4997 0.5597 2.0595 0.0000 2,274.151 8 2,274.151 8 0.6544 0.0354 2,301.066 2 Maximum 1.3674 14.9264 11.0315 0.0232 3.1603 0.6083 3.7686 1.4997 0.5597 2.0595 0.0000 2,274.151 8 2,274.151 8 0.6544 0.0354 2,301.066 2 Mitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 56.25 0.00 51.88 56.68 0.00 48.80 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 3 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.2 Overall Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Area 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 0.0000 2.0000e- 005 2.0000e- 005 0.0000 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0000 0.0137 Unmitigated Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Area 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 0.0000 2.0000e- 005 2.0000e- 005 0.0000 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0000 0.0137 Mitigated Operational CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 4 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.0 Construction Detail Construction Phase Phase Number Phase Name Phase Type Start Date End Date Num Days Week Num Days Phase Description 1 Site Preparation Site Preparation 5/1/2023 5/12/2023 5 10 2 Grading Grading 5/15/2023 6/9/2023 5 20 3 Paving Paving 6/12/2023 11/30/2023 5 124 4 Architectural Coating Architectural Coating 9/1/2023 11/30/2023 5 65 OffRoad Equipment Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Graders 1 8.00 187 0.41 Site Preparation Rubber Tired Dozers 1 7.00 247 0.40 Site Preparation Tractors/Loaders/Backhoes 1 8.00 97 0.37 Grading Graders 1 8.00 187 0.41 Grading Rubber Tired Dozers 1 8.00 247 0.40 Grading Tractors/Loaders/Backhoes 2 7.00 97 0.37 Paving Cement and Mortar Mixers 1 6.00 9 0.56 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 3,529 (Architectural Coating – sqft) Acres of Grading (Site Preparation Phase): 9.38 Acres of Grading (Grading Phase): 20 Acres of Paving: 1.35 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 5 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.1 Mitigation Measures Construction Replace Ground Cover Water Exposed Area Reduce Vehicle Speed on Unpaved Roads Clean Paved Roads Paving Pavers 1 6.00 130 0.42 Paving Paving Equipment 1 8.00 132 0.36 Paving Rollers 1 7.00 80 0.38 Paving Tractors/Loaders/Backhoes 1 8.00 97 0.37 Architectural Coating Air Compressors 1 6.00 78 0.48 Trips and VMT Phase Name Offroad Equipment Count Worker Trip Number Vendor Trip Number Hauling Trip Number Worker Trip Length Vendor Trip Length Hauling Trip Length Worker Vehicle Class Vendor Vehicle Class Hauling Vehicle Class Site Preparation 3 8.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Grading 4 10.00 0.00 64.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Paving 5 13.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Architectural Coating 1 5.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 6 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 6.2641 0.0000 6.2641 3.0039 0.0000 3.0039 0.0000 0.0000 Off-Road 1.1339 12.4250 6.6420 0.0172 0.5074 0.5074 0.4668 0.4668 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Total 1.1339 12.4250 6.6420 0.0172 6.2641 0.5074 6.7715 3.0039 0.4668 3.4707 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0225 0.0158 0.1858 5.3000e- 004 0.0657 3.2000e- 004 0.0660 0.0174 3.0000e- 004 0.0177 54.4877 54.4877 1.7400e- 003 1.6400e- 003 55.0208 Total 0.0225 0.0158 0.1858 5.3000e- 004 0.0657 3.2000e- 004 0.0660 0.0174 3.0000e- 004 0.0177 54.4877 54.4877 1.7400e- 003 1.6400e- 003 55.0208 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 7 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 2.6779 0.0000 2.6779 1.2842 0.0000 1.2842 0.0000 0.0000 Off-Road 1.1339 12.4250 6.6420 0.0172 0.5074 0.5074 0.4668 0.4668 0.0000 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Total 1.1339 12.4250 6.6420 0.0172 2.6779 0.5074 3.1853 1.2842 0.4668 1.7509 0.0000 1,666.057 3 1,666.057 3 0.5388 1,679.528 2 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0225 0.0158 0.1858 5.3000e- 004 0.0623 3.2000e- 004 0.0626 0.0166 3.0000e- 004 0.0169 54.4877 54.4877 1.7400e- 003 1.6400e- 003 55.0208 Total 0.0225 0.0158 0.1858 5.3000e- 004 0.0623 3.2000e- 004 0.0626 0.0166 3.0000e- 004 0.0169 54.4877 54.4877 1.7400e- 003 1.6400e- 003 55.0208 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 8 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 7.0855 0.0000 7.0855 3.4252 0.0000 3.4252 0.0000 0.0000 Off-Road 1.3330 14.4676 8.7038 0.0206 0.6044 0.6044 0.5560 0.5560 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Total 1.3330 14.4676 8.7038 0.0206 7.0855 0.6044 7.6899 3.4252 0.5560 3.9812 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 6.3700e- 003 0.4390 0.1019 1.9300e- 003 0.0560 3.5100e- 003 0.0595 0.0153 3.3600e- 003 0.0187 210.4274 210.4274 6.8400e- 003 0.0334 220.5399 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0281 0.0198 0.2322 6.7000e- 004 0.0822 4.0000e- 004 0.0826 0.0218 3.7000e- 004 0.0222 68.1097 68.1097 2.1700e- 003 2.0500e- 003 68.7760 Total 0.0344 0.4587 0.3341 2.6000e- 003 0.1381 3.9100e- 003 0.1420 0.0371 3.7300e- 003 0.0409 278.5371 278.5371 9.0100e- 003 0.0354 289.3159 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 9 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Fugitive Dust 3.0291 0.0000 3.0291 1.4643 0.0000 1.4643 0.0000 0.0000 Off-Road 1.3330 14.4676 8.7038 0.0206 0.6044 0.6044 0.5560 0.5560 0.0000 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Total 1.3330 14.4676 8.7038 0.0206 3.0291 0.6044 3.6334 1.4643 0.5560 2.0203 0.0000 1,995.614 7 1,995.614 7 0.6454 2,011.750 3 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 6.3700e- 003 0.4390 0.1019 1.9300e- 003 0.0534 3.5100e- 003 0.0569 0.0147 3.3600e- 003 0.0181 210.4274 210.4274 6.8400e- 003 0.0334 220.5399 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0281 0.0198 0.2322 6.7000e- 004 0.0779 4.0000e- 004 0.0783 0.0207 3.7000e- 004 0.0211 68.1097 68.1097 2.1700e- 003 2.0500e- 003 68.7760 Total 0.0344 0.4587 0.3341 2.6000e- 003 0.1313 3.9100e- 003 0.1352 0.0355 3.7300e- 003 0.0392 278.5371 278.5371 9.0100e- 003 0.0354 289.3159 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 10 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Off-Road 0.6446 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Paving 0.0285 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.6731 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0365 0.0257 0.3019 8.7000e- 004 0.1068 5.2000e- 004 0.1073 0.0283 4.8000e- 004 0.0288 88.5426 88.5426 2.8300e- 003 2.6700e- 003 89.4088 Total 0.0365 0.0257 0.3019 8.7000e- 004 0.1068 5.2000e- 004 0.1073 0.0283 4.8000e- 004 0.0288 88.5426 88.5426 2.8300e- 003 2.6700e- 003 89.4088 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 11 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Off-Road 0.6446 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 0.0000 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Paving 0.0285 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.6731 6.2357 8.8024 0.0136 0.3084 0.3084 0.2846 0.2846 0.0000 1,297.688 0 1,297.688 0 0.4114 1,307.972 5 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0365 0.0257 0.3019 8.7000e- 004 0.1012 5.2000e- 004 0.1017 0.0270 4.8000e- 004 0.0274 88.5426 88.5426 2.8300e- 003 2.6700e- 003 89.4088 Total 0.0365 0.0257 0.3019 8.7000e- 004 0.1012 5.2000e- 004 0.1017 0.0270 4.8000e- 004 0.0274 88.5426 88.5426 2.8300e- 003 2.6700e- 003 89.4088 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 12 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Archit. Coating 0.3775 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Total 0.5691 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 281.4481 281.4481 0.0168 281.8690 Unmitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0140 9.9000e- 003 0.1161 3.3000e- 004 0.0411 2.0000e- 004 0.0413 0.0109 1.8000e- 004 0.0111 34.0548 34.0548 1.0900e- 003 1.0300e- 003 34.3880 Total 0.0140 9.9000e- 003 0.1161 3.3000e- 004 0.0411 2.0000e- 004 0.0413 0.0109 1.8000e- 004 0.0111 34.0548 34.0548 1.0900e- 003 1.0300e- 003 34.3880 Unmitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 13 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Archit. Coating 0.3775 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.1917 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Total 0.5691 1.3030 1.8111 2.9700e- 003 0.0708 0.0708 0.0708 0.0708 0.0000 281.4481 281.4481 0.0168 281.8690 Mitigated Construction On-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 0.0140 9.9000e- 003 0.1161 3.3000e- 004 0.0389 2.0000e- 004 0.0391 0.0104 1.8000e- 004 0.0106 34.0548 34.0548 1.0900e- 003 1.0300e- 003 34.3880 Total 0.0140 9.9000e- 003 0.1161 3.3000e- 004 0.0389 2.0000e- 004 0.0391 0.0104 1.8000e- 004 0.0106 34.0548 34.0548 1.0900e- 003 1.0300e- 003 34.3880 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 14 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 4.0 Operational Detail - Mobile ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 4.1 Mitigation Measures Mobile 4.2 Trip Summary Information 4.3 Trip Type Information Average Daily Trip Rate Unmitigated Mitigated Land Use Weekday Saturday Sunday Annual VMT Annual VMT Other Asphalt Surfaces 0.00 0.00 0.00 Total 0.00 0.00 0.00 Miles Trip %Trip Purpose % Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Other Asphalt Surfaces 9.50 7.30 7.30 0.00 0.00 0.00 0 0 0 4.4 Fleet Mix Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Other Asphalt Surfaces 0.558086 0.056127 0.180570 0.129764 0.024304 0.005480 0.007016 0.007028 0.000551 0.000343 0.026017 0.001231 0.003481 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 15 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 5.0 Energy Detail ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day NaturalGas Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 NaturalGas Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 5.2 Energy by Land Use - NaturalGas NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr lb/day lb/day Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated 5.1 Mitigation Measures Energy Historical Energy Use: N CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 16 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 6.1 Mitigation Measures Area 6.0 Area Detail ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category lb/day lb/day Mitigated 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Unmitigated 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 5.2 Energy by Land Use - NaturalGas NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr lb/day lb/day Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 17 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory lb/day lb/day Architectural Coating 6.7200e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 0.0208 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.6000e- 004 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Unmitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 18 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 7.1 Mitigation Measures Water 7.0 Water Detail 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory lb/day lb/day Architectural Coating 6.7200e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 0.0208 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.6000e- 004 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Total 0.0281 5.0000e- 005 6.0000e- 003 0.0000 2.0000e- 005 2.0000e- 005 2.0000e- 005 2.0000e- 005 0.0129 0.0129 3.0000e- 005 0.0137 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 19 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 11.0 Vegetation 8.1 Mitigation Measures Waste 8.0 Waste Detail 9.0 Operational Offroad Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type 10.0 Stationary Equipment Fire Pumps and Emergency Generators Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment Equipment Type Number CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:51 AMPage 20 of 20 Diablo Trail - Contra Costa County, Winter EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Trail Contra Costa County, Annual Project Characteristics - Land Use - Includes 0.9 mile trail + 200 feet of retaining walls + 600 sf of ped/bike path Construction Phase - estimate construction schedule Demolition - no demolition Grading - 115 cy import, 400 cy export Vehicle Trips - no trips Construction Off-road Equipment Mitigation - per BAAQMD dust control measures 1.1 Land Usage Land Uses Size Metric Lot Acreage Floor Surface Area Population Other Asphalt Surfaces 58.82 1000sqft 1.35 58,824.00 0 1.2 Other Project Characteristics Urbanization Climate Zone Urban 4 Wind Speed (m/s)Precipitation Freq (Days)2.2 58 1.3 User Entered Comments & Non-Default Data 1.0 Project Characteristics Utility Company Pacific Gas and Electric Company 2023Operational Year CO2 Intensity (lb/MWhr) 203.98 0.033CH4 Intensity (lb/MWhr) 0.004N2O Intensity (lb/MWhr) Table Name Column Name Default Value New Value tblConstDustMitigation CleanPavedRoadPercentReduction 0 6 tblConstDustMitigation WaterUnpavedRoadVehicleSpeed 0 15 tblConstructionPhase NumDays 10.00 65.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 1 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.0 Emissions Summary tblConstructionPhase NumDays 4.00 20.00 tblConstructionPhase NumDays 10.00 124.00 tblConstructionPhase NumDays 2.00 10.00 tblConstructionPhase PhaseEndDate 6/5/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/8/2023 6/9/2023 tblConstructionPhase PhaseEndDate 5/22/2023 11/30/2023 tblConstructionPhase PhaseEndDate 5/2/2023 5/12/2023 tblConstructionPhase PhaseStartDate 5/23/2023 9/1/2023 tblConstructionPhase PhaseStartDate 5/3/2023 5/15/2023 tblConstructionPhase PhaseStartDate 5/9/2023 6/12/2023 tblGrading MaterialExported 0.00 400.00 tblGrading MaterialImported 0.00 115.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 2 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.1 Overall Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year tons/yr MT/yr 2023 0.0822 0.6421 0.7508 1.3200e- 003 0.1115 0.0301 0.1416 0.0518 0.0279 0.0797 0.0000 115.7797 115.7797 0.0322 5.0000e- 004 116.7324 Maximum 0.0822 0.6421 0.7508 1.3200e- 003 0.1115 0.0301 0.1416 0.0518 0.0279 0.0797 0.0000 115.7797 115.7797 0.0322 5.0000e- 004 116.7324 Unmitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Year tons/yr MT/yr 2023 0.0822 0.6421 0.7508 1.3200e- 003 0.0525 0.0301 0.0826 0.0234 0.0279 0.0514 0.0000 115.7795 115.7795 0.0322 5.0000e- 004 116.7323 Maximum 0.0822 0.6421 0.7508 1.3200e- 003 0.0525 0.0301 0.0826 0.0234 0.0279 0.0514 0.0000 115.7795 115.7795 0.0322 5.0000e- 004 116.7323 Mitigated Construction ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 52.89 0.00 41.65 54.73 0.00 35.55 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 3 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Quarter Start Date End Date Maximum Unmitigated ROG + NOX (tons/quarter)Maximum Mitigated ROG + NOX (tons/quarter) 1 5-1-2023 7-31-2023 0.3337 0.3337 2 8-1-2023 9-30-2023 0.1721 0.1721 Highest 0.3337 0.3337 2.2 Overall Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Area 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Waste 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Water 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Unmitigated Operational CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 4 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 2.2 Overall Operational ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Area 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Energy 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mobile 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Waste 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Water 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Mitigated Operational 3.0 Construction Detail Construction Phase Phase Number Phase Name Phase Type Start Date End Date Num Days Week Num Days Phase Description 1 Site Preparation Site Preparation 5/1/2023 5/12/2023 5 10 2 Grading Grading 5/15/2023 6/9/2023 5 20 3 Paving Paving 6/12/2023 11/30/2023 5 124 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio-CO2 Total CO2 CH4 N20 CO2e Percent Reduction 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 5 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 4 Architectural Coating Architectural Coating 9/1/2023 11/30/2023 5 65 OffRoad Equipment Phase Name Offroad Equipment Type Amount Usage Hours Horse Power Load Factor Site Preparation Graders 1 8.00 187 0.41 Site Preparation Rubber Tired Dozers 1 7.00 247 0.40 Site Preparation Tractors/Loaders/Backhoes 1 8.00 97 0.37 Grading Graders 1 8.00 187 0.41 Grading Rubber Tired Dozers 1 8.00 247 0.40 Grading Tractors/Loaders/Backhoes 2 7.00 97 0.37 Paving Cement and Mortar Mixers 1 6.00 9 0.56 Paving Pavers 1 6.00 130 0.42 Paving Paving Equipment 1 8.00 132 0.36 Paving Rollers 1 7.00 80 0.38 Paving Tractors/Loaders/Backhoes 1 8.00 97 0.37 Architectural Coating Air Compressors 1 6.00 78 0.48 Trips and VMT Phase Name Offroad Equipment Count Worker Trip Number Vendor Trip Number Hauling Trip Number Worker Trip Length Vendor Trip Length Hauling Trip Length Worker Vehicle Class Vendor Vehicle Class Hauling Vehicle Class Site Preparation 3 8.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Grading 4 10.00 0.00 64.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Paving 5 13.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT Residential Indoor: 0; Residential Outdoor: 0; Non-Residential Indoor: 0; Non-Residential Outdoor: 0; Striped Parking Area: 3,529 (Architectural Coating – sqft) Acres of Grading (Site Preparation Phase): 9.38 Acres of Grading (Grading Phase): 20 Acres of Paving: 1.35 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 6 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Fugitive Dust 0.0313 0.0000 0.0313 0.0150 0.0000 0.0150 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 5.6700e- 003 0.0621 0.0332 9.0000e- 005 2.5400e- 003 2.5400e- 003 2.3300e- 003 2.3300e- 003 0.0000 7.5571 7.5571 2.4400e- 003 0.0000 7.6182 Total 5.6700e- 003 0.0621 0.0332 9.0000e- 005 0.0313 2.5400e- 003 0.0339 0.0150 2.3300e- 003 0.0174 0.0000 7.5571 7.5571 2.4400e- 003 0.0000 7.6182 Unmitigated Construction On-Site 3.1 Mitigation Measures Construction Replace Ground Cover Water Exposed Area Reduce Vehicle Speed on Unpaved Roads Clean Paved Roads Architectural Coating 1 5.00 0.00 0.00 10.80 7.30 20.00 LD_Mix HDT_Mix HHDT CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 7 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.0000e- 004 7.0000e- 005 9.0000e- 004 0.0000 3.2000e- 004 0.0000 3.2000e- 004 8.0000e- 005 0.0000 9.0000e- 005 0.0000 0.2498 0.2498 1.0000e- 005 1.0000e- 005 0.2521 Total 1.0000e- 004 7.0000e- 005 9.0000e- 004 0.0000 3.2000e- 004 0.0000 3.2000e- 004 8.0000e- 005 0.0000 9.0000e- 005 0.0000 0.2498 0.2498 1.0000e- 005 1.0000e- 005 0.2521 Unmitigated Construction Off-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Fugitive Dust 0.0134 0.0000 0.0134 6.4200e- 003 0.0000 6.4200e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 5.6700e- 003 0.0621 0.0332 9.0000e- 005 2.5400e- 003 2.5400e- 003 2.3300e- 003 2.3300e- 003 0.0000 7.5571 7.5571 2.4400e- 003 0.0000 7.6182 Total 5.6700e- 003 0.0621 0.0332 9.0000e- 005 0.0134 2.5400e- 003 0.0159 6.4200e- 003 2.3300e- 003 8.7500e- 003 0.0000 7.5571 7.5571 2.4400e- 003 0.0000 7.6182 Mitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 8 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.2 Site Preparation - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 1.0000e- 004 7.0000e- 005 9.0000e- 004 0.0000 3.0000e- 004 0.0000 3.0000e- 004 8.0000e- 005 0.0000 8.0000e- 005 0.0000 0.2498 0.2498 1.0000e- 005 1.0000e- 005 0.2521 Total 1.0000e- 004 7.0000e- 005 9.0000e- 004 0.0000 3.0000e- 004 0.0000 3.0000e- 004 8.0000e- 005 0.0000 8.0000e- 005 0.0000 0.2498 0.2498 1.0000e- 005 1.0000e- 005 0.2521 Mitigated Construction Off-Site 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Fugitive Dust 0.0709 0.0000 0.0709 0.0343 0.0000 0.0343 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0133 0.1447 0.0870 2.1000e- 004 6.0400e- 003 6.0400e- 003 5.5600e- 003 5.5600e- 003 0.0000 18.1039 18.1039 5.8600e- 003 0.0000 18.2503 Total 0.0133 0.1447 0.0870 2.1000e- 004 0.0709 6.0400e- 003 0.0769 0.0343 5.5600e- 003 0.0398 0.0000 18.1039 18.1039 5.8600e- 003 0.0000 18.2503 Unmitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 9 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 7.0000e- 005 4.3100e- 003 1.0100e- 003 2.0000e- 005 5.4000e- 004 4.0000e- 005 5.8000e- 004 1.5000e- 004 3.0000e- 005 1.8000e- 004 0.0000 1.9079 1.9079 6.0000e- 005 3.0000e- 004 1.9996 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 2.6000e- 004 1.8000e- 004 2.2500e- 003 1.0000e- 005 7.9000e- 004 0.0000 8.0000e- 004 2.1000e- 004 0.0000 2.1000e- 004 0.0000 0.6246 0.6246 2.0000e- 005 2.0000e- 005 0.6303 Total 3.3000e- 004 4.4900e- 003 3.2600e- 003 3.0000e- 005 1.3300e- 003 4.0000e- 005 1.3800e- 003 3.6000e- 004 3.0000e- 005 3.9000e- 004 0.0000 2.5325 2.5325 8.0000e- 005 3.2000e- 004 2.6299 Unmitigated Construction Off-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Fugitive Dust 0.0303 0.0000 0.0303 0.0146 0.0000 0.0146 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 0.0133 0.1447 0.0870 2.1000e- 004 6.0400e- 003 6.0400e- 003 5.5600e- 003 5.5600e- 003 0.0000 18.1039 18.1039 5.8600e- 003 0.0000 18.2503 Total 0.0133 0.1447 0.0870 2.1000e- 004 0.0303 6.0400e- 003 0.0363 0.0146 5.5600e- 003 0.0202 0.0000 18.1039 18.1039 5.8600e- 003 0.0000 18.2503 Mitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 10 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.3 Grading - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 7.0000e- 005 4.3100e- 003 1.0100e- 003 2.0000e- 005 5.2000e- 004 4.0000e- 005 5.5000e- 004 1.4000e- 004 3.0000e- 005 1.8000e- 004 0.0000 1.9079 1.9079 6.0000e- 005 3.0000e- 004 1.9996 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 2.6000e- 004 1.8000e- 004 2.2500e- 003 1.0000e- 005 7.5000e- 004 0.0000 7.6000e- 004 2.0000e- 004 0.0000 2.0000e- 004 0.0000 0.6246 0.6246 2.0000e- 005 2.0000e- 005 0.6303 Total 3.3000e- 004 4.4900e- 003 3.2600e- 003 3.0000e- 005 1.2700e- 003 4.0000e- 005 1.3100e- 003 3.4000e- 004 3.0000e- 005 3.8000e- 004 0.0000 2.5325 2.5325 8.0000e- 005 3.2000e- 004 2.6299 Mitigated Construction Off-Site 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Off-Road 0.0400 0.3866 0.5458 8.4000e- 004 0.0191 0.0191 0.0177 0.0177 0.0000 72.9891 72.9891 0.0231 0.0000 73.5675 Paving 1.7700e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0417 0.3866 0.5458 8.4000e- 004 0.0191 0.0191 0.0177 0.0177 0.0000 72.9891 72.9891 0.0231 0.0000 73.5675 Unmitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 11 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 2.1100e- 003 1.4500e- 003 0.0181 5.0000e- 005 6.3900e- 003 3.0000e- 005 6.4200e- 003 1.7000e- 003 3.0000e- 005 1.7300e- 003 0.0000 5.0342 5.0342 1.5000e- 004 1.4000e- 004 5.0798 Total 2.1100e- 003 1.4500e- 003 0.0181 5.0000e- 005 6.3900e- 003 3.0000e- 005 6.4200e- 003 1.7000e- 003 3.0000e- 005 1.7300e- 003 0.0000 5.0342 5.0342 1.5000e- 004 1.4000e- 004 5.0798 Unmitigated Construction Off-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Off-Road 0.0400 0.3866 0.5458 8.4000e- 004 0.0191 0.0191 0.0177 0.0177 0.0000 72.9890 72.9890 0.0231 0.0000 73.5674 Paving 1.7700e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0417 0.3866 0.5458 8.4000e- 004 0.0191 0.0191 0.0177 0.0177 0.0000 72.9890 72.9890 0.0231 0.0000 73.5674 Mitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 12 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.4 Paving - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 2.1100e- 003 1.4500e- 003 0.0181 5.0000e- 005 6.0600e- 003 3.0000e- 005 6.0900e- 003 1.6200e- 003 3.0000e- 005 1.6500e- 003 0.0000 5.0342 5.0342 1.5000e- 004 1.4000e- 004 5.0798 Total 2.1100e- 003 1.4500e- 003 0.0181 5.0000e- 005 6.0600e- 003 3.0000e- 005 6.0900e- 003 1.6200e- 003 3.0000e- 005 1.6500e- 003 0.0000 5.0342 5.0342 1.5000e- 004 1.4000e- 004 5.0798 Mitigated Construction Off-Site 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Archit. Coating 0.0123 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 6.2300e- 003 0.0424 0.0589 1.0000e- 004 2.3000e- 003 2.3000e- 003 2.3000e- 003 2.3000e- 003 0.0000 8.2981 8.2981 5.0000e- 004 0.0000 8.3105 Total 0.0185 0.0424 0.0589 1.0000e- 004 2.3000e- 003 2.3000e- 003 2.3000e- 003 2.3000e- 003 0.0000 8.2981 8.2981 5.0000e- 004 0.0000 8.3105 Unmitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 13 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 4.3000e- 004 2.9000e- 004 3.6500e- 003 1.0000e- 005 1.2900e- 003 1.0000e- 005 1.3000e- 003 3.4000e- 004 1.0000e- 005 3.5000e- 004 0.0000 1.0150 1.0150 3.0000e- 005 3.0000e- 005 1.0242 Total 4.3000e- 004 2.9000e- 004 3.6500e- 003 1.0000e- 005 1.2900e- 003 1.0000e- 005 1.3000e- 003 3.4000e- 004 1.0000e- 005 3.5000e- 004 0.0000 1.0150 1.0150 3.0000e- 005 3.0000e- 005 1.0242 Unmitigated Construction Off-Site ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Archit. Coating 0.0123 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Off-Road 6.2300e- 003 0.0424 0.0589 1.0000e- 004 2.3000e- 003 2.3000e- 003 2.3000e- 003 2.3000e- 003 0.0000 8.2981 8.2981 5.0000e- 004 0.0000 8.3105 Total 0.0185 0.0424 0.0589 1.0000e- 004 2.3000e- 003 2.3000e- 003 2.3000e- 003 2.3000e- 003 0.0000 8.2981 8.2981 5.0000e- 004 0.0000 8.3105 Mitigated Construction On-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 14 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 3.5 Architectural Coating - 2023 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Hauling 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Vendor 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Worker 4.3000e- 004 2.9000e- 004 3.6500e- 003 1.0000e- 005 1.2200e- 003 1.0000e- 005 1.2300e- 003 3.3000e- 004 1.0000e- 005 3.3000e- 004 0.0000 1.0150 1.0150 3.0000e- 005 3.0000e- 005 1.0242 Total 4.3000e- 004 2.9000e- 004 3.6500e- 003 1.0000e- 005 1.2200e- 003 1.0000e- 005 1.2300e- 003 3.3000e- 004 1.0000e- 005 3.3000e- 004 0.0000 1.0150 1.0150 3.0000e- 005 3.0000e- 005 1.0242 Mitigated Construction Off-Site CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 15 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 4.0 Operational Detail - Mobile ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 4.1 Mitigation Measures Mobile 4.2 Trip Summary Information 4.3 Trip Type Information Average Daily Trip Rate Unmitigated Mitigated Land Use Weekday Saturday Sunday Annual VMT Annual VMT Other Asphalt Surfaces 0.00 0.00 0.00 Total 0.00 0.00 0.00 Miles Trip %Trip Purpose % Land Use H-W or C-W H-S or C-C H-O or C-NW H-W or C-W H-S or C-C H-O or C-NW Primary Diverted Pass-by Other Asphalt Surfaces 9.50 7.30 7.30 0.00 0.00 0.00 0 0 0 4.4 Fleet Mix Land Use LDA LDT1 LDT2 MDV LHD1 LHD2 MHD HHD OBUS UBUS MCY SBUS MH Other Asphalt Surfaces 0.558086 0.056127 0.180570 0.129764 0.024304 0.005480 0.007016 0.007028 0.000551 0.000343 0.026017 0.001231 0.003481 CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 16 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 5.0 Energy Detail ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Electricity Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Electricity Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 NaturalGas Mitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 NaturalGas Unmitigated 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 5.1 Mitigation Measures Energy Historical Energy Use: N CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 17 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 5.2 Energy by Land Use - NaturalGas NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr tons/yr MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Unmitigated NaturalGa s Use ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Land Use kBTU/yr tons/yr MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 18 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 6.1 Mitigation Measures Area 6.0 Area Detail 5.3 Energy by Land Use - Electricity Electricity Use Total CO2 CH4 N2O CO2e Land Use kWh/yr MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Unmitigated Electricity Use Total CO2 CH4 N2O CO2e Land Use kWh/yr MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 19 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e Category tons/yr MT/yr Mitigated 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Unmitigated 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory tons/yr MT/yr Architectural Coating 1.2300e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 3.8000e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.0000e- 005 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Total 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Unmitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 20 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 7.1 Mitigation Measures Water 7.0 Water Detail 6.2 Area by SubCategory ROG NOx CO SO2 Fugitive PM10 Exhaust PM10 PM10 Total Fugitive PM2.5 Exhaust PM2.5 PM2.5 Total Bio- CO2 NBio- CO2 Total CO2 CH4 N2O CO2e SubCategory tons/yr MT/yr Architectural Coating 1.2300e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Consumer Products 3.8000e- 003 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 Landscaping 5.0000e- 005 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Total 5.0800e- 003 0.0000 5.4000e- 004 0.0000 0.0000 0.0000 0.0000 0.0000 0.0000 1.0500e- 003 1.0500e- 003 0.0000 0.0000 1.1200e- 003 Mitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 21 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Total CO2 CH4 N2O CO2e Category MT/yr Mitigated 0.0000 0.0000 0.0000 0.0000 Unmitigated 0.0000 0.0000 0.0000 0.0000 7.2 Water by Land Use Indoor/Out door Use Total CO2 CH4 N2O CO2e Land Use Mgal MT/yr Other Asphalt Surfaces 0 / 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Unmitigated CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 22 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 7.2 Water by Land Use Indoor/Out door Use Total CO2 CH4 N2O CO2e Land Use Mgal MT/yr Other Asphalt Surfaces 0 / 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Mitigated 8.1 Mitigation Measures Waste 8.0 Waste Detail Total CO2 CH4 N2O CO2e MT/yr Mitigated 0.0000 0.0000 0.0000 0.0000 Unmitigated 0.0000 0.0000 0.0000 0.0000 Category/Year CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 23 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 8.2 Waste by Land Use Waste Disposed Total CO2 CH4 N2O CO2e Land Use tons MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Unmitigated Waste Disposed Total CO2 CH4 N2O CO2e Land Use tons MT/yr Other Asphalt Surfaces 0 0.0000 0.0000 0.0000 0.0000 Total 0.0000 0.0000 0.0000 0.0000 Mitigated 9.0 Operational Offroad Equipment Type Number Hours/Day Days/Year Horse Power Load Factor Fuel Type CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 24 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 11.0 Vegetation 10.0 Stationary Equipment Fire Pumps and Emergency Generators Equipment Type Number Hours/Day Hours/Year Horse Power Load Factor Fuel Type Boilers Equipment Type Number Heat Input/Day Heat Input/Year Boiler Rating Fuel Type User Defined Equipment Equipment Type Number CalEEMod Version: CalEEMod.2020.4.0 Date: 6/13/2022 8:48 AMPage 25 of 25 Diablo Trail - Contra Costa County, Annual EMFAC Off-Model Adjustment Factors for Gasoline Light Duty Vehicle to Account for the SAFE Vehicle Rule Applied DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Draft IS/MND September 2022 Appendix B Biological Resources Report and Arborist Report DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Project Danville, California Biological Resources Report June 2022 Prepared on Behalf of: Town of Danville 510 La Gonda Way Danville, CA 94526 (925) 314-3388 Prepared by: Sequoia Ecological Consulting, Inc. 1342 Creekside Drive Walnut Creek, CA 94596 (925) 855-5500 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 i CONTENTS 1.0 INTRODUCTION .....................................................................................................................1 2.0 LOCATION AND SETTING ........................................................................................................1 3.0 PROJECT DESCRIPTION ...........................................................................................................2 4.0 REGULATORY SETTING ...........................................................................................................6 4.1 Federal ............................................................................................................................................. 6 4.1.1 Federal Endangered Species Act ................................................................................................ 6 4.1.2 Migratory Bird Treaty Act of 1918............................................................................................. 7 4.1.3 Bald and Golden Eagle Protection Act of 1940.......................................................................... 7 4.1.4 U.S. Army Corps of Engineers – Clean Water Act – Section 404 ................................................ 8 4.2 State ................................................................................................................................................. 8 4.2.1 California Environmental Quality Act ........................................................................................ 8 4.2.2 California Endangered Species Act ............................................................................................ 9 4.2.3 California Fish and Game Code – Section 1600 – Lake or Streambed Alteration Agreement ... 9 4.2.4 California Fish and Game Code – Section 3500 – Nesting Bird Protection .............................. 10 4.2.5 California Fish and Game Code – Fully Protected Species ....................................................... 10 4.2.6 Regional Water Quality Control Board (RWQCB) – Clean Water Act – Section 401 and Porter- Cologne Water Quality Control Act ......................................................................................... 10 4.3 Local ............................................................................................................................................... 13 4.3.1 Town of Danville 2030 General Plan ....................................................................................... 13 4.3.2 Town of Danville Tree Preservation Ordinance ....................................................................... 13 5.0 METHODS ............................................................................................................................ 14 5.1 Definitions ...................................................................................................................................... 14 5.1.1 Special-Status Species .............................................................................................................. 14 5.2 Desktop Review ............................................................................................................................. 16 5.3 Site Assessment ............................................................................................................................. 17 5.4 Habitat Assessments ...................................................................................................................... 17 5.4.1 Potential to Occur .................................................................................................................... 17 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 ii 6.0 RESULTS .............................................................................................................................. 18 6.1 Topography and Hydrology............................................................................................................ 18 6.2 Plant Communities and Wildlife Habitats ...................................................................................... 18 6.2.1 Ruderal .................................................................................................................................... 21 6.2.2 Non-Native Annual Grassland ................................................................................................. 21 6.2.3 Mixed Riparian Woodland ....................................................................................................... 21 6.2.4 Wildlife Corridors ..................................................................................................................... 21 6.2.5 Special-Status Plants ............................................................................................................... 22 6.2.6 Special-Status Animals ............................................................................................................ 26 7.0 DISCUSSION AND IMPACT ASSESSMENT ............................................................................... 35 7.1 Significance Criteria ....................................................................................................................... 35 7.2 Impacts Analysis ............................................................................................................................. 37 7.2.1 Impact BIO-1: Nesting Birds and Special-Status Bats .............................................................. 37 7.2.2 Impact BIO-2. Riparian Habitat and Waters of the United States/State................................. 39 7.2.3 Impact BIO-3: Town of Danville Tree Preservation Ordinance ............................................. 40 8.0 REFERENCES ........................................................................................................................ 43 FIGURES Figure 1. Regional Map of the Diablo Road Trail Project Site. ...................................................................... 4 Figure 2. Location Map of the Diablo Road Trail Project Site. ...................................................................... 5 Figure 3. Soil Types on the Diablo Road Trail Project Site. ......................................................................... 19 Figure 4. USFWS National Wetlands Inventory on the Diablo Road Trail Project Site. .............................. 20 Figure 5. Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site. .................................................................................................................................. 23 Figure 6. Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site. .......................................................................................................................... 31 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 iii TABLES Table 1. Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site. ....... 24 Table 2. Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site. .... 32 Table 3. Plant Species Observed on the Diablo Road Trail Project Site. ..................................................... 34 Table 4. Wildlife Species Observed on the Diablo Road Trail Project Site. ................................................ 35 APPENDICES (Back of Report) Appendix A. Aquatic Resources Delineation Report, Prepared by Sequoia Ecological Consulting, Inc., Dated January 2022 Appendix B. USFWS Information for Planning and Consultation System Report Appendix C. NMFS Online Species List Query Report DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 1 1.0 INTRODUCTION Sequoia Ecological Consulting, Inc. (Sequoia) has prepared this Biological Resources Report (Report) for the proposed Diablo Road Trail Project (Project) located along Diablo Road in the City of Danville, Contra Costa County, California (Figures 1 and 2). Our analysis provides a description of existing biological resources on the Project site and identifies potentially significant impacts that could occur to sensitive biological resources from the proposed Project. Biological resources include common plant and animal species, and special-status plants and animals as designated by the U.S. Fish and Wildlife Service (USFWS), California Department of Fish and Wildlife (CDFW), National Marine Fisheries Service (NMFS), and other resource organizations including the California Native Plant Society (CNPS). Biological resources also include waters of the United States and State of California, as regulated by the U.S. Army Corps of Engineers (USACE), California Regional Water Quality Control Board (RWQCB), and CDFW. Please note that this analysis assesses the potential for impacts to regulated waters but does not provide the level of detail required for a formal delineation of “waters of the United States” suitable for submittal to USACE, the regulatory agency that defines waters of the United States. A formal wetland delineation was performed in December 2021 and an Aquatic Resources Delineation Report is provided as Appendix A. In accordance with the California Environmental Quality Act (CEQA) checklist, this Report also provides mitigation measures for “potentially significant” impacts that could occur to biological resources pursuant to CEQA (Pub. Resources Code §§ 21000 et seq.; 14 Cal. Code Regs §§ 15000 et seq). The prescribed mitigation measures would reduce impacts to levels considered “less than significant” pursuant to CEQA. Accordingly, this Report is suitable for review or inclusion in a review pursuant to CEQA by the Town of Danville for the proposed Project. 2.0 LOCATION AND SETTING The proposed Project is located along Diablo Road in Danville, Contra Costa County, California, approximately 0.59-mile east of Highway 680 and five miles from the western entrance of Mt. Diablo State Park (Figures 1 and 2). The Project site is located within private lands and winds along Diablo Road from its intersection with Fairway Drive to Blackhawk Road to the east to approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road. The Project site is located immediately north of East Branch Green Valley Creek, along Diablo Road shoulder and property belonging to the Magee Cattle Ranch, and south of single-family residential development. The Project site is characterized as highly disturbed, ruderal (weedy) habitat with overhanging mixed riparian woodland canopy and nonnative annual grasslands. Consequently, due to the location of the Project site along the shoulder of a busy thoroughfare and the subsequent regular disturbance regime, native habitats on the Project site are absent. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 2 3.0 PROJECT DESCRIPTION The proposed Project consists of construction of an 8-foot-wide off-street paved multi-use path with 2- foot shoulders along the southern shoulder of Diablo Road. The proposed Project is envisioned as a 0.9- mile, mostly Class I, mixed-use path for pedestrians and cyclists that will connect the Diablo Road/Green Valley Road corridor to the west with Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed Project is located within the Town of Danville and public right of way (ROW) and on easements to be obtained from private property owners. The west end of the Project would terminate just east of the intersection of Fairway Drive and Diablo Road and the east end of the Project would terminate approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road. Completion of the proposed Project would conclude emergency repairs required to protect Diablo Road in place as a result of erosion. The Project would stabilize slope and improve erosion protection. The Project would also provide bicyclists a safer alternative to Diablo Road and would help close a multi- purpose trail gap between the existing Diablo Road Trail (aka Barbara Haile Trail) and access to Mount Diablo State Park. These benefits are described in the policies and objectives of the Town of Danville Bicycle Master Plan, Danville’s 2030 General Plan, and the Contra Costa Countywide Bicycle and Pedestrian Plan. The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations, narrowing to a lesser width in constrained locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Retaining walls would be constructed with wood supported on piers; however, mechanically stabilized earth, concrete barrier, block walls, or other types could be utilized in the final design. Most retaining walls would be less than 3 feet tall, though in a few locations local topography would require the construction of walls up to 5 feet in height. The retaining walls would have a blended visual appearance to existing walls in the area. The proposed Project will also include a pedestrian and bicycle roadway crossing at the intersection of Diablo Road in the vicinity of Fairway Drive. The crossing would connect to the existing Diablo Road Trail Class I bicycle/pedestrian path that lies parallel to Diablo Road on the north side of the roadway. The crossing will include: crosswalk striping and pavement markings; regulatory, warning and guide signage; at-grade asphalt concrete ADA ramps (landings) with truncated domes at existing and proposed trailheads; High-Intensity Activated Crosswalk System (HAWK); advanced warning beacon system; and associated electrical infrastructure. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 3 The proposed Project would require the installation of new culverts or culvert extensions throughout the alignment. The type, size and material of culvert extensions would be designed to match existing conditions. Total excavation and fill of soils for the proposed Project would require approximately 115 cubic yards of imported soils and 400 cubic yards of exported soil. Material brought on to the site would be tested in accordance with local and state requirements to ensure contaminated material is not brought on site. Material that is not removed from the Project area once excavated would be stockpiled and stabilized until it could be off-hauled. Vegetation and tree removal would be required to construct the trail and would include the removal of native trees and non-native trees. It is estimated that nine native coast live oaks with diameters at breast height (DBH) of approximately 12 to 30 inches, six native valley oaks with DBH ranging from 14 to 42 inches, and ten non-native eucalyptus with DBH ranging from 37 to 66 inches would be removed. Protected trees would be replanted within the project area at a ratio consistent with local tree protection ordinances and California Department of Fish and Wildlife (CDFW) replanting requirements. Underground utilities would remain in place and no utility relocation is required. No additional or expanded use of water or wastewater facilities is proposed as part of this Project. Access to the construction site would occur from Diablo Road and adjacent roads. While final staging areas would be decided by the contractor, staging would primarily occur within the proposed trail alignment. These areas would be used to store and stage materials and equipment at different times throughout Project construction. Staging areas outside of the proposed alignment would typically consist of previously disturbed areas with bare, gravel, or paved surfaces. Trail construction is anticipated to take approximately 6 months to complete and would begin around May 2023. Following completion of the trail, the trails would be maintained through a Geologic Hazards Abatement District (GHAD) and in accordance with easement agreements. Trail operation and maintenance would require occasional sweeping, litter pick-up, and vegetation and tree trimming to maintain adequate vertical clearance for trail users. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 4 Figure 1. Regional Map of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 5 Figure 2. Location Map of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 6 4.0 REGULATORY SETTING Regulatory authority over biological resources is shared by federal, state, and local agencies under a variety of laws, ordinances, regulations, and statutes. Primary authority for biological resources lies within the land use control and planning authority of local jurisdictions (in this instance the Town of Danville). Below we provide a summary of these regulatory authorities and a brief discussion on applicability to the proposed Project. More in-depth analyses are provided in Section 6 (Results) and Section 7 (Discussion and Impacts Assessment). 4.1 Federal 4.1.1 Federal Endangered Species Act The Federal Endangered Species Act (FESA) provides protection for federally listed endangered and threatened species and their habitats. A project may obtain permission to take federally listed species in one of two ways: a Section 10 Habitat Conservation Plan (HCP) issued to a non-federal entity, or a Section 7 Biological Opinion from the USFWS and/or the National Oceanic and Atmospheric Administration (NOAA) issued to another federal agency that funds or permits an action (e.g., USACE). Under either Section of the FESA, adverse impacts to protected species are avoided, minimized, and mitigated. Both cases require consultation with the USFWS and/or NMFS, which ultimately issues a Biological Opinion determining whether the federally listed species may be incidentally taken pursuant to the proposed action and authorizing incidental take. Section 7 of FESA requires that federal agencies develop a conservation program for listed species (FESA 7(a)(a)) and that they avoid actions that will jeopardize the continued existence of the species or result in the destruction or adverse modification of the species’ designated critical habitat (FESA 7(a)(2)). FESA Section 9 prohibits all persons and agencies from take of threatened and endangered species (though the prohibition on taking listed plants only applies to plants taken from “areas under Federal jurisdiction” or plants taken “in knowing violation of any law or regulation of any State or in the course of any violation of a State criminal trespass law”). Those who violate this mandate face civil and criminal penalties, including civil fines of up to $25,000 per violation, as well as criminal penalties of up to $50,000 and imprisonment for one year. Section 10 of FESA regulates a wide range of activities affecting fish and wildlife designated as endangered or threatened and the habitats on which they rely. Section 10 prohibits activities affecting these protected fish and wildlife species and their habitats unless authorized by a permit from USFWS or NMFS. These permits may include incidental take permits, enhancement of survival permits, or recovery and interstate commerce permits. HCPs under Section 10(a)(1)(B) provide for partnerships with non-federal parties to conserve the ecosystems upon which listed species depend. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 7 HCPs are required as part of an application for an incidental take permit under Section 10. They describe the anticipated effects of the proposed take, how those impacts will be minimized or mitigated, and how the HCP will be funded. 4.1.1.1 Responsible Agency FESA gives regulatory authority to USFWS for federally listed terrestrial species and non-anadromous fish. NMFS has regulatory authority over federally listed marine mammals and anadromous fish. 4.1.1.2 Applicability to the Proposed Project The Project site does not provide suitable habitat for federally listed plant or animal species and no designated critical habitat occurs on the Project site. Accordingly, no federally listed species or designated USFWS/NMFS critical habitat would be affected by the proposed Project (Tables 1 and 2). 4.1.2 Migratory Bird Treaty Act of 1918 The Migratory Bird Treaty Act (MBTA) (16 USC §§ 703–711), as administered by the USFWS, makes it unlawful to “pursue, hunt, take, capture, kill, attempt to take, capture or kill, offer for sale, sell, offer to purchase, purchase, deliver for shipment, ship, cause to be shipped, deliver for transportation, transport, cause to be transported, carry, or cause to be carried by any means whatever, receive for shipment, transportation or carriage, or export at any time, or in any manner, any migratory bird, or any part, nest, or egg of any such bird.” This includes direct and indirect acts, except for harassment and habitat modification, which are not included unless they result in direct loss of birds, nests, or eggs. 4.1.2.1 Applicability to the Proposed Project The Project site provides suitable nesting habitat for common passerine (song birds) and raptors (birds of prey) species. These birds are protected pursuant to MBTA. Prior to commencement of Project- related activities, a preconstruction survey would be performed, and active nests detected would be provided with an appropriately sized non-disturbance buffer. See Impacts Analysis section below. 4.1.3 Bald and Golden Eagle Protection Act of 1940 The Bald and Golden Eagle Protection Act (BGEPA; 16 USC. 668-668c) prohibits anyone from taking, possessing, or transporting a bald eagle (Haliaeetus leucocephalus) or golden eagle (Aquila chrysaetos), or the parts, nests, or eggs of such birds without prior authorization. This includes inactive nests as well as active nests. Take means to pursue, shoot, shoot at, poison, wound, kill, capture, trap, collect, destroy, molest, or disturb. Activities that directly or indirectly lead to take are prohibited without a permit. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 8 4.1.3.1 Applicability to the Proposed Project The Project site does not provide suitable foraging or nesting habitat for bald eagle; however, potentially suitable foraging and nesting habitat for golden eagle occurs in the vicinity of the Project site. This species is protected pursuant to the BGEPA and the MBTA. Prior to commencement of Project- related activities, a preconstruction survey for golden eagle would be performed, and active nests detected would be provided with an appropriately sized non-disturbance buffer. See Impacts Analysis section below. 4.1.4 U.S. Army Corps of Engineers – Clean Water Act – Section 404 USACE regulates activities within "waters of the United States” pursuant to congressional acts: Section 404 of the Clean Water Act (CWA; 1977, as amended) and Section 10 of the Rivers and Harbors Act of 1899. Section 404 of the CWA (1977, as amended) requires a permit for discharge of dredged or fill material into waters of the United States. Under Section 404, waters of the United States are defined as all waters that are used currently, or were used in the past, or may be used in the future for interstate or foreign commerce, including waters subject to the ebb and flow of the tide up to the high tide line. Additionally, areas such as wetlands, rivers, and streams (including intermittent streams and tributaries) are considered waters of the United States. The extent of wetlands is determined by examining the presence of hydrophytic vegetation, hydric soils, and wetland hydrology. Under normal circumstances, all three of these parameters must be satisfied for an area to be considered a jurisdictional wetland under Section 404 of the CWA. Fill within wetlands is regulated under the CWA through a Nationwide Permit Program and an Individual Permit Program. 4.1.4.1 Applicability to the Proposed Project East Branch Green Valley Creek is immediately adjacent to the Project site on its western side and falls under USACE jurisdiction pursuant to Section 404 of the CWA; however, as presently designed, the proposed Project will stay above/outside ordinary high-water mark (OHWM) and therefore outside of USACE jurisdiction. Thus, prior authorization from USACE pursuant to Section 404 of the CWA would not be required for the proposed Project. 4.2 State 4.2.1 California Environmental Quality Act CEQA requires public agencies in California to analyze and disclose potential environmental impacts associated with a proposed discretionary project that the agency will carry out, fund, or approve. Any significant impact must be mitigated to the extent feasible, below the threshold of significance. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 9 4.2.1.1 Applicability to the Proposed Project This document is suitable for use by the CEQA lead agency (i.e., the Town of Danville) for preparation of any CEQA review document for the proposed Project. This Report has been prepared as a Biology Section suitable for incorporation into an Initial Study, Mitigated Negative Declaration, or Environmental Impact Report. 4.2.2 California Endangered Species Act The CDFW is responsible for administering the California Endangered Species Act (CESA). Section 2080 of the California Fish and Wildlife Code prohibits take of any species that the Fish and Wildlife Commission determines to be an endangered species or a threatened species. However, CESA does allow for take that is incidental to otherwise lawful development projects. Sections 2081(b) and (c) of CESA allow the CDFW to issue an incidental take permit for a state listed threatened and endangered species only if specific criteria are met (i.e., the effects of the authorized take are minimized and fully mitigated). The measures required to meet this obligation shall be roughly proportional in extent to the impact of the authorized taking on the species. Where various measures are available to meet this obligation, the measures required shall maintain the applicant's objectives to the greatest extent possible. All required measures shall be capable of successful implementation. 4.2.2.1 Applicability to the Proposed Project No state listed plant or animal species would likely be impacted by the proposed Project (Tables 1 and 2). Historically, the Project site has been highly disturbed due to its location along the shoulder of a busy thoroughfare and within grazed non-native grassland. As a result, there are no native habitats present, and no suitable habitat is present for special-status plants or animals. Furthermore, no special-status plants or animals were detected during surveys conducted by Sequoia in spring and winter of 2021. As such, the proposed Project should not be required to obtain authorization under CESA. 4.2.3 California Fish and Game Code – Section 1600 – Lake or Streambed Alteration Agreement The CDFW regulates activities within watercourses, lakes, and in-stream reservoirs. Under Section 1602 of the California Fish and Game Code (CFGC)—often referred to as the Lake or Streambed Alteration Agreement (LSAA)—the CDFW regulates activities that would alter the flow or change or use any material from the bed, channel, or bank of any perennial, intermittent, or ephemeral river, stream, or lake. Each of these activities requires a Section 1602 permit. Section 1602 requires the CDFW to be notified of any activity that might affect lakes and streams. It also identifies the process through which an applicant can come to an agreement with the state regarding the protection of these resources, both during and following construction. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 10 4.2.3.1 Applicability to the Proposed Project Impacts to the bed, bank, and/or channel, or associated riparian vegetation of East Branch Green Valley Creek would be regulated by the CDFW pursuant to Section 1602 of the CFGC. As such, a Section 1602 Agreement (i.e., Streambed Alteration Agreement) from CDFW would be required for the proposed Project. See Impacts Analysis section below. 4.2.4 California Fish and Game Code – Section 3500 – Nesting Bird Protection CFGC Section 3503 states that it is unlawful to take, possess, or needlessly destroy the nests or eggs of any bird, except as otherwise provided by the CFGC or any regulation made pursuant thereto. CFGC Section 3503.5 protects all birds of prey (raptors) and their eggs and nests. Section 3513 states that it is unlawful to take or possess any migratory non-game bird as designated in the MBTA. These regulations could require that elements of a project (specifically vegetation removal or construction near nest trees) be reduced or eliminated during critical phases of the nesting cycle unless surveys by a qualified biologist demonstrate that nests, eggs, or nesting birds will not be disturbed, which may be subject to approval by the CDFW and/or the USFWS. 4.2.5 California Fish and Game Code – Fully Protected Species CFGC Sections 3505, 3511, 4700, 5050, and 5515 afford full protection to a number of specific wildlife species. Fully protected species cannot be taken or possessed under state law, even if federal take authorization is issued, except in connection with a natural communities conservation plan (NCCP) or for the purpose of scientific research and relocation of bird species for the protection of livestock. 4.2.5.1 Applicability to the Proposed Project The Project site provides suitable habitat for wildlife protected pursuant to CFGC Section 3500 and the MBTA. As such, preconstruction surveys for these species would need to be conducted prior to Project commencement to ensure no mortality of these species occurs as a direct result of the proposed Project. 4.2.6 Regional Water Quality Control Board (RWQCB) – Clean Water Act – Section 401 and Porter- Cologne Water Quality Control Act The State Water Resources Control Board (SWRCB) and RWQCB regulate activities in "waters of the state" (which includes wetlands) through two sources of legal authority: Section 401 of the CWA and the Porter- Cologne Water Quality Control Act (Porter-Cologne Act) (Wat. Code, Div. 7, § 13000 et seq.). The Section 401 water quality certification program allows the state to ensure that activities requiring a federal permit or license comply with state water quality standards. Though similar to Section 404 and 401 requirements, the Porter-Cologne Act applies to all “waters of the state” rather than to the portions thereof below ordinary high water mark. “Waters of the state” is defined as any surface water or groundwater, including saline waters, within the boundaries of the state (Water Code § 13050(e)). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 11 The Porter-Cologne Act requires any person discharging waste or proposing to discharge waste in any region that could affect the quality of the “waters of the state” to file a report of waste discharge. Pursuant to the Porter-Cologne Act, the RWQCB also regulates “isolated wetlands.” Functionally, the RWQCB typically evaluates whether an additional waste discharge requirement is necessary for the balance between federal and state jurisdictional boundaries during the 401 certification process. The RWQCB issues a permit or waiver that includes implementing water quality control plans that reflect the beneficial uses to be protected. Waters of the State subject to RWQCB regulation extend to the top of bank, as well as isolated water/wetland features. On April 2, 2019, the SWRCB adopted Resolution 2019-0015, thereby adopting a document entitled, “State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State” (“Procedures”) for inclusion in the Water Quality Control Plans for Inland Surface Waters, Enclosed Bays, and Estuaries of California. In taking this action, the SWRCB noted that under the Porter-Cologne Act, discharges of dredged or fill material to waters of the state are subject to waste discharge requirements or waivers thereof. The SWRCB further explained that “although the state has historically relied primarily on requirements in the CWA to protect wetlands, U.S. Supreme Court rulings reducing the jurisdiction of the CWA over wetland areas by limiting the definition of ‘waters of the United States’ have necessitated the use of California’s independent authorities under the Porter-Cologne Act to protect these vital resources.” The Office of Administrative Law (OAL) approved the Procedures on August 28, 2019. Pursuant to the Procedures, the effective date is nine months upon OAL approval. Accordingly, the Procedures became effective May 28, 2020. By adopting the Procedures, the SWRCB mandated and standardized the evaluation of impacts and protection of waters of the state from impacts due to dredge and fill activities. The Procedures include: 1) a wetland definition; 2) a jurisdictional framework for determining if a feature that meets the wetland definition is a water of the state; 3) wetland delineation procedures; and 4) procedures for application submittal, and the review and approval of dredge or fill activities. The Procedures define an area as a wetland if it meets three criteria: wetland hydrology, wetland soils, and (if vegetated) wetland plants. An area is a wetland if: (1) the area has continuous or recurrent saturation of the upper substrate caused by groundwater, or shallow surface water, or both; (2) the duration of such saturation is sufficient to cause anaerobic conditions in the upper substrate; and (3) the area’s vegetation is dominated by hydrophytes, or the area lacks vegetation. Waters of the state, by definition, includes more aquatic features than waters of the U.S., which defines the jurisdiction of the federal government. Waters of the state are not so limited. In addition, the federal definition of a wetland requires a prevalence of wetland vegetation under normal circumstances. To account for wetlands in arid portions of the state, the SWRCB’s definition differs from the federal definition in that an area may be a wetland even if it does not support vegetation. If vegetation is present, however, the SWRCB’s definition requires that the vegetation be wetland DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 12 vegetation. The SWRCB’s definition clarifies that vegetated and unvegetated wetlands will be regulated in the same manner. The Procedures also include a jurisdictional framework that applies to aquatic features that meet the wetland definition. The jurisdictional framework will guide applicants and staff in determining whether an aquatic feature that meets the wetland definition will be regulated as a water of the state. The jurisdictional framework is intended to exclude from regulation any artificially-created, temporary features, such as tire ruts or other transient depressions caused by human activity, while still capturing small, naturally-occurring features, such as seasonal wetlands and small vernal pools that may be outside of federal jurisdiction. The Procedures do not expand the SWRCB’s jurisdiction beyond areas already under SWRCB’s jurisdiction. The Procedures exclude the following agricultural features from the protections accorded to wetlands: (1) ditches with ephemeral flow that are not a relocated water of the state or excavated in a water of the state; (2) ditches with intermittent flow that are not a relocated water of the state or excavated in a water of the state, or that do not drain wetlands other than any wetlands described in (4) or (5) below; (3) ditches that do not flow, either directly or through another water, into another water of the state; (4) artificially irrigated areas that would revert to dry land should application of waters to that area cease; or (5) artificial, constructed lakes and ponds created in dry land such as farm and stock watering ponds, irrigation ponds, and settling basins. The Procedures clarify what information and analysis the applicant needs to submit to have a complete application. The Procedures standardize when an alternative analysis needs to be conducted and set a minimum mitigation ratio for any permanent impacts to waters of the state resulting from dredge and fill activities. When an alternatives analysis is required, the applicant must demonstrate that the proposed alternative is the Least Environmentally Damaging Practicable Alternative (LEDPA). The term practicable means available and capable of being done after taking into consideration cost, existing technology, and other logistics in light of the overall project purpose. 4.2.6.1 Applicability to the Proposed Project East Branch Green Valley Creek immediately adjacent to the Project site falls under RWQCB/SWRCB jurisdiction pursuant to Section 401 of the CWA; however, as presently designed, the proposed Project will stay above/outside OHWM and therefore outside of RWQCB/SWRCB jurisdiction. Thus, prior authorization from RWQCB/SWRCB pursuant to Section 401 of the CWA would not be required for the proposed Project. However, portions of the Project alignment appear to encroach below top-of-bank, and a majority of the Project is within the riparian corridor, both of which may be regulated by RWQCB and necessitate state authorization through the Waste Discharge Requirements (WDR) Program. See Impacts Analysis section below. To comply with the Porter-Cologne Act, adequate pre- and post-construction Best Management Practices (BMPs) will be planned and incorporated into Project implementation plans to protect DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 13 downstream waterways. In addition, the Project will develop a Storm Water Pollution Prevention Plan (SWPPP) demonstrating BMPs that will be installed/implemented prior to Project commencement. The SWPPP will be submitted to the Town of Danville as a condition of Project approval. Stormwater protection and treatment measures will be implemented to ensure that the proposed Project remains in compliance with the Porter-Cologne Act and that discharges of dredged or fill material do not enter waters of the State. 4.3 Local 4.3.1 Town of Danville 2030 General Plan The Town of Danville (Town), the lead agency for the proposed Project, adopted a General Plan on March 19, 2013 (Town of Danville 2030 General Plan) to address the Town’s goals, policies, and programs regarding development, resource management, and public safety. The Resources and Hazards Element of the Town’s 2030 General Plan provides the following environmental quality goals and policies pertaining to biological resources applicable to this Project: Goal 21: Protect and enhance Danville’s natural features, including its hillsides, ridgelines, creeks, vegetation, and wildlife. Goal 22: Improve water quality in Danville and the water bodies that receive runoff from Danville, including San Francisco Bay. 4.3.1.1 Applicability to the Proposed Project The proposed Project is located on Diablo Road within highly disturbed ruderal and non-native annual grassland habitat. Due to the location of the Project site along the shoulder of this busy thoroughfare and the subsequent regular disturbance regime, native habitats on the Project site are absent. Thus, no special-status species or their habitats will be impacted by the proposed Project. In addition, although the proposed Project is located immediately adjacent to East Branch Green Valley Creek, Project-related activities will remain outside of this state and federally jurisdictional aquatic feature, and a SWPPP, including pre- and postconstruction BMPs, will be implemented to ensure no discharges of dredged or fill material enter waters of the United States/State. 4.3.2 Town of Danville Tree Preservation Ordinance The Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) requires acquisition of a Tree Removal Permit prior to removal of certain trees within the City Limits. A Tree Removal Permit for tree removal is required if the tree(s) are on the Town’s list of protected, heritage, and/or memorial trees, as defined below: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 14 Protected Trees: Any of the following native trees having a single trunk or main stem 10 inches or greater in diameter or multiple trunk trees with tree trunks totaling 20 inches in diameter, measured 4.5 feet above natural grade: • Blue oak (Quercus douglasii) • California bay (Umbellularia californica) • California black oak (Quercus kelloggii) • California buckeye (Aesculus californica) • California sycamore (Platanus racemosa) • Canyon live oak (Quercus chrysolepis) • Coast live oak (Quercus agrifolia) • Interior live oak (Quercus wislizenii) • Madrone (Arbutus menziesii) • London plane tree (Plantanus acerifolia) • Valley oak (Quercus lobata) • White alder (Alnus rhombifolia) Heritage Trees: Any single trunked tree, regardless of species, which has a trunk diameter of 36 inches or greater, measured 4.5 feet above natural grade. Multi-trunk trees are not considered heritage trees therefore no permit would be required. Memorial Trees: A tree planted on public property in memory of or commemoration of an individual or individuals. 4.3.2.1 Applicability to the Proposed Project Removal of any protected, heritage, and/or memorial trees, as defined in the Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) would require acquisition of a Tree Removal Permit and appropriate mitigation. See Impacts Analysis section below. 5.0 METHODS Sequoia performed various desktop and in-field assessments in support of this Report. Using those results, Sequoia employed various site assessments to evaluate the presence of and/or likelihood of occurrence of sensitive resources on the Project site. 5.1 Definitions 5.1.1 Special-Status Species For the purposes of this document, special-status species include: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 15 • Plant, fish, and wildlife species listed as Threatened or Endangered under FESA (50 CFR 17), and candidates for listing under the statute; • Species protected by the CFGC, including nesting birds and Fully Protected species; • Plant, fish, and wildlife species listed as Threatened or Endangered under CESA; and the laws and regulations for implementing CESA as defined in CFGC §2050 et seq. and the California Code of Regulations (CCR) 14 CCR §670.1 et seq., and candidates for listing under the statute (CFGC §2068); • Species meeting the definition of ‘Rare’ or ‘Endangered’ under CEQA Guidelines 14 CCR §15125 (c) and/or 14 CCR §15380, including plants listed on CNPS Lists 1A, 1B, 2A, and 2B, 3, and 4. Plants occurring on CNPS Ranks 3 and 4 are “plants about which more information is necessary,” and “plants of limited distribution” (CNPS 2001). These plants may be included as special-status species on a case-by-case basis due to local significance or recent biological information (see additional definition information below); • USFWS Birds of Conservation Concern; • Fully Protected species, as designated by the CDFW (CFGC 3511, 4700, 5050, and 5515); • Species of Special Concern, as designated by the CDFW and required by 14 CCR §15380; and/or • Avian species protected under the MBTA of 1918. Addition information regarding these definitions is provided below: 5.1.1.1 Federally Threatened or Endangered Species A species listed as Threatened or Endangered under the FESA is protected from unauthorized “take” (that is, harass, harm, pursue, hunt, shoot, trap) of that species. If it is necessary to take a federally listed Threatened or Endangered species as part of an otherwise lawful activity, it would be necessary to receive permission from the USFWS prior to initiating the take. 5.1.1.2 State Threatened or Endangered Species A species listed as Threatened or Endangered under the CESA is protected from unauthorized “take” (that is, harass, pursue, hunt, shoot, trap) of that species. If it is necessary to “take” a state Threatened or Endangered species as part of an otherwise lawful activity, it would be necessary to receive permission from CDFW prior to initiating the “take.” 5.1.1.3 CDFW Species of Special Concern California Species of Special Concern are species in which their California breeding populations are seriously declining and extirpation from all or a portion of their range is possible. This designation affords no legally mandated protection; however, some of these species could be considered “rare” and must therefore be considered in any project that will, or is currently, undergoing CEQA review, and/or that must obtain an environmental permit(s) from a public agency. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 16 5.1.1.4 CNPS Rank Species The CNPS maintains an inventory of special-status plant species. This inventory has four lists of plants with varying rarity. These lists are Rank 1, Rank 2, Rank 3, and Rank 4. Although plants on these lists have no formal legal protection (unless they are also state or federally listed species), CDFW requests the inclusion of Rank 1 species in environmental documents. In addition, other state and local agencies may request the inclusion of species on other lists as well. Rank 1 and 2 species are defined below: • Rank 1A: Presumed extinct in California; • Rank 1B: Rare, threatened, or endangered in California and elsewhere; • Rank 2A: Plants presumed extirpated in California, but more common elsewhere; • Rank 2B: Rare, threatened, or endangered in California, but more common elsewhere. Under the CEQA review process only CNPS Rank 1 and 2 species are considered due to meeting CEQA’s definition of “rare” or “endangered.” However, Rank 3 and 4 species are not regarded as significant pursuant to CEQA. 5.1.1.5 Fully Protected Birds Fully Protected birds are protected under CFGC 3511 and may not be “taken” or possessed (i.e., kept in captivity) at any time. 5.2 Desktop Review Sequoia reviewed relevant databases and literature for baseline information regarding biological resources occurring and potentially occurring on the Project site and the immediate vicinity. The review included the following sources: • USFWS Information for Planning and Consultation (IPaC) search (USFWS 2021a), and Critical Habitat Portal (USFWS 2021b; Appendix B); • CNPS Online Inventory of Rare and Endangered Plants of California for the Diablo, California USGS 7.5-minute quadrangles (CNPS 2021); • NMFS Online Species List Query (NMFS 2021, Appendix C); • Natural Resources Conservation Service’s (NRCS) Web Soil Survey (2021a), hydric soils list (NRCS 2021b), • USFWS National Wetlands Inventory (NWI; Figure 4); • CDFW California Natural Diversity Database (CNDDB) for the Project polygon and a 3-mile buffer (CDFW 2021; Figures 5 and 6); and, • Aerial photographs (Google Earth Pro 2021). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 17 5.3 Site Assessment Sequoia biologist, Aurelie Muckenhirn, conducted surveys on the Project site on December 15, 2021 to record biological resources and to assess the limits of areas potentially regulated by resource agencies (i.e., preliminary hydrology analysis). Surveys involved searching all habitats on the site and recording all plant and wildlife species observed. Sequoia cross-referenced the habitats occurring on the Project site with the habitat requirements of regional special-status species to determine if the proposed Project could directly or indirectly impact these species. Any special-status species or suitable habitat was documented. Tables 1 and 2 present the potential for occurrence of special-status plant and animal species, respectively, known to occur in the vicinity of the Project site, along with their habitat requirements, occurrence classification, and basis for occurrence classification. 5.4 Habitat Assessments Consecutive transects were traversed at approximately 20-foot intervals throughout the Project site. During the surveys, biologists scanned for special-status species and/or suitable habitat for these species, including foothill yellow-legged frog (Rana boylii), California red-legged frog (Rana draytonii), California tiger salamander (Ambystoma californiense), and Alameda whipsnake (Masticophis lateralis euryxanthus), among others. Any special-status species or suitable habitat was documented. 5.4.1 Potential to Occur Following the site assessment, potential for special-status species to occur in the Project site was evaluated according to the following criteria: • No Potential. Habitat on and adjacent to the site is clearly unsuitable for the species’ requirements (foraging, breeding, cover, substrate, elevation, hydrology, plant community, site history, disturbance regime). • Unlikely. Few of the habitat components meeting the species’ requirements are present, and/or the majority of habitat on and adjacent to the site is unsuitable or of very poor quality. The species is not likely to be found on the site. • Moderate Potential. Some of the habitat components meeting the species’ requirements are present, and/or only some of the habitat on or adjacent to the site is unsuitable. The species has a moderate probability of being found on the site. • High Potential. All of the habitat components meeting the species’ requirements are present and/or most of the habitat on or adjacent to the site is highly suitable. The species has a high probability of being found on the site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 18 • Present. Species is observed on the site or has been recorded (i.e., CNDDB, other reports) on the site recently. 6.0 RESULTS The results of the desktop review and site assessment conducted on December 15, 2021 are presented below. 6.1 Topography and Hydrology The Project site is located along the shoulder of Diablo Road immediately north of East Branch Green Valley Creek on its western side and south of the creek on its eastern side. East Branch Green Valley Creek flows east to west and connects with San Ramon Creek in downtown Danville. The Project site slopes slightly from north to south, with short segments of the proposed footprint located below the top-of-bank of the creek, on the western side of the site. Elevation on the Project site ranges from 465 to 581 feet above mean sea level (MSL). During the site assessment conducted on December 15, 2021, Sequoia performed a preliminary hydrologic analysis and compared information ascertained from the desktop review with present site conditions, specifically, NRCS soil type and USFWS NWI layers (NRCS 2021a, NRCS, 2021b, USFWS 2021c; Figures 3 and 4). This level of analysis does not conform to the amount of detail typically required for a formal wetland delineation suitable for submittal to USACE. On December 9, 2021, a formal wetland delineation was conducted by Sequoia biologists Andrew Ford and Ari Rogers. The Aquatic Resources Delineation Report is provided as Appendix A. The climate of the Project site, and California overall, is Mediterranean (i.e., dry-summer subtropical), characterized by warm, dry summers with average highs between 70- and 80-degrees Fahrenheit and average lows in the 50s and 60s, and cool, wet winters with average highs in the 50s and average lows in the 40s Fahrenheit. The average annual precipitation is approximately 25.04 inches, falling primarily between November and March (U.S. Climate Data 2021). 6.2 Plant Communities and Wildlife Habitats On December 15, 2021, Sequoia staff conducted a survey of the Project site and characterized vegetation present. During the survey, biologists also documented plant and wildlife species observed on the Project site. Nomenclature used for plant names follows The Jepson Manual Second Edition (Baldwin 2012), while nomenclature used for wildlife follows CDFW’s Complete list of amphibian, reptile, bird, and mammal species in California (2016). Table 3 and 4 lists plant and wildlife species observed on the Project site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 19 Figure 3. Soil Types on the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 20 Figure 4. USFWS National Wetlands Inventory on the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 21 6.2.1 Ruderal The Project site is dominated by ruderal herbaceous habitat. Ruderal communities are groupings of plants that thrive in areas disturbed by human activity. Ruderal vegetation is adapted to high levels of disturbance and endures for long periods of time in areas that have continual disturbance. Dominant grass and forb species observed within ruderal communities on the Project site include black mustard (Brassica nigra), bristly ox-tongue (Helminthotheca echioides), California burclover (Medicago polymorpha), poison hemlock (Conium maculatum), and yellow star thistle (Centaurea solstitialis). 6.2.2 Non-Native Annual Grassland Non-native annual grassland is comprised primarily of plant species that mature in spring and early summer, before spreading seed and dying in late summer and fall. Non-native annual grassland is found in large patches throughout the Project site, primarily interspersed with ruderal communities. Dominant grass and forb species observed within non-native annual grassland communities on the Project site include slender wild oat (Avena barbata), ripgut brome (Bromus diandrus), Italian thistle (Carduus pycnocephalus ssp. pycnocephalus), and filaree species (Erodium botrys, E. cicutarium). 6.2.3 Mixed Riparian Woodland Mixed riparian woodlands are diverse habitats that support numerous plant species that can include grasses, annual and perennial forbs, vines, shrubs, and trees. A variety of plants creates a complex layering of understory and overstory which in turn provides habitat to numerous wildlife species. When found within the bed, channel, or bank of any river, stream, or lake, riparian vegetation is also protected under Section §1602 of the CFGC; and the CDFW has included riparian communities in the CNDDB. Riparian woodland habitat is present within and surrounding East Branch Green Valley Creek, which lies just outside the Project site. Dominant plant species observed within the riparian woodland community on the Project site include Italian ryegrass (Festuca perennis), mugwort (Artemisia douglasiana), cattail (Typha spp.), giant reed (Arundo donax), mulefat (Baccharis salicifolia), willows (Salix exigua, S. laevigata, and S. losiolepis), and Fremont cottonwood (Populus fremontii). 6.2.4 Wildlife Corridors Wildlife corridors are habitats that provide connectivity between natural communities otherwise separated by urbanization and other development. Wildlife corridors provide access for animals to travel between these communities for seasonal migration, access to overwintering/summering habitat, breeding, etc. They also allow animals a route to move away from natural disasters and other forms of habitat loss, as well as to recolonize habitats previously extirpated. Wildlife corridors provide opportunities to breed, forage, migrate/emigrate, disperse, and forage (Beier and Loe 1992). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 22 The proposed Project will not interfere with the movement of native wildlife. This Project is located along a narrow strip of shoulder along Diablo Road and within non-native annual grassland. Although East Branch Green Valley Creek functions as a wildlife corridor and is immediately adjacent to the Project site, the creek itself and its function will not be blocked or impeded by the proposed Project. 6.2.5 Special-Status Plants Figure 5 provides a graphical illustration for special-status plant species occurrences within 3 miles of the Project site. Table 1 provides an assessment of potential to occur of special-status plant species on the Project site. Twenty-one (21) special-status plants have been previously documented within 3 miles of the Project site (CNDDB 2021; CNPS 2021); however, no plants have been observed or mapped onsite. Sequoia analyzed the potential to occur for these plants species, as well as species included in CNPS and IPaC resource lists during the desktop review (Table 1). A number of these species require specialized habitats such as cismontane woodland, chaparral, rocky areas, and alkaline soils that are not found on the Project site. Accordingly, due to lack of suitable habitat and/or lack of known/recent occurrences in the Project vicinity, these 21 special-status plant species are not expected to occur and are therefore not discussed further in this analysis. These species are Mt. Diablo manzanita (Arctostaphylos auriculata), Contra Costa manzanita (Arctostaphylos manzanita ssp. laevigata), Mt. Diablo fairy lantern (Calochortus pulchellus), chaparral harebell (Campanula exigua), Congdon's tarplant (Centromadia parryi ssp. congdonii), Hospital Canyon larkspur (Delphinium californicum ssp. interius), western leatherwood (Dirca occidentalis), Mt. Diablo buckwheat (Eriogonum truncatum), Jepson's coyote thistle (Eryngium jepsonii), San Joaquin spearscale (Extriplex joaquinana), fragrant fritillary (Fritillaria liliacea), Diablo helianthella (Helianthella castanea), Brewer's western flax (Hesperolinon breweri), Hall’s bush-mallow (Malacothamnus hallii), woodland woolythreads (Monolopia gracilens), shining navarretia (Navarretia nigelliformis ssp. radians), Mt. Diablo phacelia (Phaceliamphacelioides), rock sanicle (Sanicula saxatilis), Mt. Diablo jewelflower (Strepthanthus hispidus), northern slender pondweed (Stuckenia filiformis ssp. aplina), and oval-leaved viburnum (Viburnum ellipticum) (see Table 1, Figure 5). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 23 Figure 5. Closest Known Records for Special-Status Plant Species Within 3 Miles of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 24 Table 1. Special-Status Plant Species with Potential to Occur on the Diablo Road Trail Project Site. Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence Arctostaphylos auriculata Mt. Diablo manzanita 1B.3 Occurs in sandstone chaparral and cismontane woodland at elevations of 440 to 2,135 feet MSL. Blooms from January through March. None. no suitable habitat occurs on the Project site. Arctostaphylos manzanita ssp. laevigata Contra Costa manzanita 1B.2 Occurs in rocky chaparral at elevations of 1,410 to 3,610 feet MSL. Blooms from January through March. None. no suitable habitat occurs on the Project site. Calochortus pulchellus Mt. Diablo fairy lantern 1B.2 Occurs in chaparral, cismontane woodland, riparian woodland, and valley and foothill grassland at elevations of 95 to 2,755 feet MSL. Blooms from April through June. None. No suitable habitat occurs on the Project site. Campanula exigua chaparral harebell 1B.2 Occurs in rocky, usually serpentinite soils within chaparral at elevations of 900 to 4,100 feet MSL. Blooms from May through June. None. No suitable habitat occurs on the Project site. Centromadia parryi ssp. congdonii Congdon's tarplant 1B.1 Occurs in valley and foothill grassland at elevations of 0 to 754 feet. Blooms from May through October. None. No suitable habitat occurs on the Project site. Delphinium californicum ssp. interius Hospital Canyon larkspur 1B.2 Occurs in chaparral, cismontane woodland, and coastal scrub. Blooms from April through June. None. No suitable habitat occurs on the Project site. Dirca occidentalis western leatherwood 1B.2 Occurs in mesic soils within Broad leafed upland forest, closed cone coniferous forest, chaparral, cismontane woodland, North Coast coniferous forest, riparian forest, and riparian woodland at elevations of 80 to 1,395 feet MSL. Blooms from January through March. None. No suitable habitat occurs on the Project site. Eriogonum truncatum Mt. Diablo buckwheat 1B.1 Occurs in sandy soils in within chaparral, coastal scrub, and valley and foothill grassland at elevations of 5 to 1,150 feet MSL. Blooms from April through September. None. No suitable habitat occurs on the Project site. Eryngium jepsonii Jepson’s coyote thistle 1B.2 Occurs in clay soils within valley and foothill grassland and vernal pools at elevations of 5 to 985 feet MSL. Blooms from April through August. None. No suitable habitat occurs on the Project site. Extriplex joaquinana San Joaquin spearscale 1B.2 Occurs in alkaline soils within chenopod scrub, meadows and seeps, playas as well as valley and foothill grassland at elevations of 3 to 2,739 None. No suitable habitat occurs on the Project site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 25 Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence feet. Blooms from April through October. Fritillaria liliacea fragrant fritillary 1B.1 Often occurs in serpentinite soils within cismontane woodland, coastal prairie, coastal scrub and valley and foothill grassland at elevations of 10 to 1,345 feet. Blooms from February through April. None. No suitable habitat occurs on the Project site. Hesperolinon breweri Brewer’s western flax 1B.2 Occurs in chaparral, cismontane woodland and valley and foothill grassland, usually serpentinite soils, at elevations of 95 to 3,100 feet MSL. Blooms from May through July. None. No suitable habitat occurs on the Project site. Malacothamnus hallii Hall’s bushmallow 1B.2 Occurs in chaparral and coastal scrub at elevations of 30 to 2,495 feet MSL. Blooms from May through September. None. No suitable habitat occurs on the Project site. Monolopia gracilens woodland wooly threads 1B.2 Occurs in serpentinite soils within broadleafed upland forest (openings), chaparral (openings), cismontane woodland, North Coast coniferous forest (openings), and valley and foothill grassland at elevation of 325 to 3,935 feet MSL. Blooms from March through July. None. No suitable habitat occurs on the Project site. Navarretia nigelliformis ssp. radians shining navarretia 1B.3 Occurs in cismontane woodland, valley and foothill grassland, and vernal pools, sometimes in clay soils, at elevations of 210 to 3,280 feet MSL. Blooms from April through July. None. No suitable habitat occurs on the Project site. Phacelia phacelioides Mt. Diablo phacelia 1B.2 Occurs in rocky areas, chaparral, and cismontane woodland. Blooms from April through May. None. No suitable habitat occurs on the Project site. Sanicula saxatilis rock sanicle 1B.2, CR Occurs in rocky, scree, talus within broadleafed upland forest, chaparral, and valley and foothill grassland at elevations of 2,030 to 3,855 feet MSL. Blooms from April through May. None. No suitable habitat occurs on the Project site. Strepthanthus hispidus Mt. Diablo jewelflower 1B.3 Occurs in chaparral, rocky areas, valley and foothill grasslands. Blooms from March through June. None. No suitable habitat occurs on the Project site. Stuckenia filiformis ssp. aplina northern slender pondweed 2B.2 Occurs in marshes and swamps (assorted shallow freshwater). Blooms from May through July. None. No suitable habitat occurs on the Project site. Triquetrella californica coastal triquetrella 1B.2 Occurs in coastal bluff scrub and coastal scrub at elevations of 30 to 330 feet MSL. None. No suitable habitat occurs on the Project site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 26 Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrence Viburnum ellipticum oval-leaved viburnum 2B.3 Occurs in chaparral, cismontane woodland, and lower montane coniferous forest at elevations of 705 to 4,595 feet. Blooms from May through June. None. No suitable habitat occurs on the Project site. Key to status: FT=Federally listed as threatened species CE=California listed as endangered species CNPS Rare Plant Rank 1A=Plants presumed extirpated in California, and either rare or extinct elsewhere 1B=Pants rare, threatened, or endangered in California, or elsewhere 2A=Plants presumed extirpated in California but common elsewhere 2B=Plants rare, threatened, or endangered in California but more common elsewhere 3=Plants about which more information is needed Note: CNPS ranks below 3 were excluded from this analysis. 6.2.6 Special-Status Animals Figure 6 provides a graphical illustration for special-status animal species occurrences within 3 miles of the Project site. Table 3 provides an assessment of potential to occur for special-status animal species on the Project site. Eleven (11) special-status animal species have been previously documented (CNDDB occurrences) within 3 miles. Sequoia analyzed the potential to occur for these species, as well as species included in Calfish, Pisces, NMFS, and IPaC resource lists during the desktop review (Table 3). A number of these species require specialized habitat, such as vernal pools, rocky streams, and scrub, that are not found on the Project site. Due to lack of suitable habitat and/or lack of recent occurrences in the Project vicinity, six (6) special- status animal species are not expected to occur and are therefore not discussed further in this analysis. These six species are San Joaquin kit fox (Vulpes macrotis mutica), California least tern (Sterna antillarum browni), California tiger salamander, Alameda whipsnake, delta smelt (Hypomesus transpacificus), and vernal pool fairy shrimp (Branchinecta lynchi). Descriptions and potential for occurrence of the remaining five (5) species are provided in more detail below (Table 2, Figure 6). 6.2.6.1 Pallid Bat The pallid bat (Antrozous pallidus) is designated as a California Species of Special Concern and a Medium Priority species by the Western Bat Working Group (CDFW 2021). The pallid bat is a relatively large, light-colored bat ranging throughout the western North America from interior British Columbia to Mexico (Hermanson and O’Shea 1983, Sherwin and Rambaldini 2005). They inhabit foothills and lowlands near water throughout California below 6,560 feet in elevation, but are most abundant in arid deserts and grasslands, particularly in areas with rock outcrops near water (Hermanson and O’Shea 1983). Pallid bats typically live in small groups in a variety of day and night roosts including bridges, buildings, tree hollows in coast redwoods, bole cavities in oaks, exfoliating bark, rock crevices in DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 27 outcrops and cliffs, caves, and mines (Sherwin and Rambaldini 2005). Roost sites may change seasonally and are typically reused for a few days to weeks. Pallid bats primarily feed on a variety of arthropods by capturing prey on the ground or gleaning from surfaces near the ground. Parturition varies with latitude, but generally occurs from late April to August; maternal colonies disperse by October (Hermanson and O’Shea 1983). Overwintering is common along the California coast, but individuals may migrate short distances between winter and summer roosts (Sherwin and Rambaldini 2005). Two occurrences of pallid bat are known within 3 miles of the Project site; the nearest occurrence dates to 1991 and is located approximately 1.8 miles west (CNDDB Occurrence No. 134; Figure 6). Trees on the Project site provide marginally suitable roosting habitat. As such, until preconstruction surveys are conducted that confirm or negate this species’ presence on the Project site, impacts to pallid bat would be a potentially significant impact pursuant to the CEQA. If pallid bats are identified roosting on or immediately adjacent to the Project site, mitigation measures will be implemented (see Impacts Analysis section). 6.2.6.2 Townsend’s Big-eared Bat Townsend’s big-eared bat (Corynorhinus townsendii) is designated as a California Species of Special Concern and High Priority species by the Western Bat Working Group (CDFW 2021). The Townsend’s big- eared bat is an uncommon resident throughout California, inhabiting mesic environments. The species is a moth specialist and typically roosts in cavities measuring 16 inches in diameter or greater (pers. comm. Dave Wyatt) in caves, mines, bridges, building, rock crevices, tree hollows in coastal lowlands, and cultivated valleys and nearby hills characterized by mixed vegetation below 11,000. Townsend’s big- eared bats exhibit a high site fidelity and are highly sensitive to disturbance. They forage by gleaning insects from trees and shrubs along edge habitats near water. Foraging bouts peak in late evening and may span long distances. Winter hibernacula are used from October to April. The closest known occurrence of Townsend’s big-eared bat is located approximately 2.2 miles north of the Project site (CNDDB Occurrence No. 423; Figure 6); this observation is historical and occurred in 1926. Trees on the Project site provide marginally suitable roosting habitat. As such, until preconstruction surveys are conducted that confirm or negate this species’ presence on the Project site, impacts to Townsend’s big-eared bat would be potentially significant pursuant to the CEQA. If Townsend’s big-eared bats are identified roosting on or immediately adjacent to the Project site, mitigation measures will be implemented (see Impacts Analysis section). 6.2.4.3 Foothill Yellow-Legged Frog The foothill yellow-legged frog is divided into five distinct clades in California based on genetic divergence and conservation concern (CDFW 2021). The northwest/north coast clade is the most intact population and is designated as a California Species of Special Concern. Historically, foothill yellow- legged frog occurred from west of the crest of the Cascade Mountains in Oregon south to the Transverse Ranges in Los Angeles County, and in the Sierra Nevada foothills south to Kern County DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 28 (Zweifel 1955; Stebbins 2012). The current range now excludes coastal areas south of northern San Luis Obispo County and foothill areas south of Fresno County, where the species is considered extirpated (Jennings and Hayes 1994). In a 1994 report (Fellers 1994), healthy, reproducing populations were reported in suitable habitat throughout the Diablo Range in Alameda, western Stanislaus, Santa Clara, San Benito, and western Fresno counties. Foothill yellow-legged frog are found in or near rocky streams in a variety of habitats, including valley foothill hardwood, valley-foothill riparian, coastal scrub, mixed conifer, mixed chaparral, and wet meadows (Zeiner et al. 1988). This species and aquatic habitat are considered sympatric, and foothill yellow-legged frog rarely migrate far from perennial or intermittent streams (Stebbins 2012). The foothill yellow-legged frog requires shallow, flowing water in small to moderate-sized streams containing some cobble-sized substrate and portions of open canopy important for basking (Hayes and Jennings 1988; Jennings 1988; Bourque 2008). It deposits its egg masses on the downstream side of cobbles and boulders over which a relatively thin, gentle flow of water exists (Storer 1925; Fitch 1936; Zweifel 1955; Kupferberg 1996). The foothill yellow-legged frog is known from one CNDDB occurrence within 3 miles of the Project site. The closest occurrence is located 2.3 miles to the north of the Project site (CNDDB Occurrence No. 2128; Figure 6); this observation occurred in 1953. Although potentially suitable habitat occurs adjacent to the Project site within East Branch Green Valley Creek, no suitable breeding or over-summering habitat occurs on the Project site and Diablo Road and its shoulder where the Project is located do not provide suitable migration/dispersal habitat. Accordingly, no impacts to foothill yellow-legged frog are anticipated from the proposed Project. 6.2.4.4 California Red-Legged Frog The California red-legged frog was listed as a federally threatened species on May 23, 1996 (USFWS 1996; 61 FR 25813), and is designated as a California Species of Special Concern (CDFW 2021). A recovery plan was published for the California red-legged frog on September 12, 2002 (USFWS 2002). Critical habitat was designated for this species on April 13, 2006, and revisions to the critical habitat designation were published on March 17, 2010. The Project site is not located within critical habitat for this species. The California red-legged frog is distributed throughout 26 counties in California, but is most abundant in the San Francisco Bay Area (USFWS 2017b). Populations have become isolated in the Sierra Nevada, northern coast, and northern Transverse Ranges (Jennings and Hayes 1994, Stebbins 2012). The species is believed to be extinct from the southern Transverse and Peninsular ranges, but is still present in Baja California, Mexico (USFWS 2017c). California red-legged frogs predominantly inhabit permanent water sources such as streams, lakes, marshes, natural and man-made ponds, and ephemeral drainages in valley bottoms and foothills up to 4,900 feet MSL (Jennings and Hayes 1994, Bulger et al. 2003, Stebbins 2012). Adults breed in a variety of aquatic habitats, while larvae and metamorphs use streams, deep pools, backwaters of streams and creeks, ponds, marshes, sag ponds, dune ponds, and lagoons. Stock ponds are frequently used for breeding when they provide a suitable hydroperiod, pond structure, and DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 29 vegetative cover, and are managed to control non-native predators such as bullfrogs and exotic fish. Breeding occurs between November and April within still or slow-moving water with light to dense, riparian or emergent vegetation, such as cattails (Typha spp.), tules (Scirpus spp.), or overhanging willows (Salix spp.) (Hayes and Jennings 1988). Egg masses are attached to vegetation below the surface and hatch after 6 to 14 days (Storer 1925, Jennings and Hayes 1994). Larvae undergo metamorphosis 3.5 to 7 months following hatching and reach sexual maturity at 2 to 3 years of age (Jennings and Hayes 1984, 1994). During the dry season, California red-legged frogs may use refugia in upland habitat, such as small mammal burrows or adjacent moist vegetation (USFWS 2002). Tatarian (2008) noted that 57 percent of frogs fitted with radio transmitters in the Round Valley of eastern Contra Costa County stayed at their breeding pools, whereas 43 percent moved into adjacent upland habitat or to other aquatic sites. This study reported a peak of seasonal terrestrial movement in the fall months corresponding to 0.2 inches of precipitation that tapered off into spring. Upland movement activities ranged from 3 to 233 feet, averaging 80 feet, and were associated with a variety of refugia, including ground squirrel burrows at the bases of trees or rocks, logs, grass thatch, crevices, cow hoof prints, and a downed barn door; others were associated with upland sites lacking refugia (Tatarian 2008). The majority of terrestrial movements lasted from 1 to 4 days; however, one female was reported to remain in upland habitat for 50 days (Tatarian 2008). Uplands closer to aquatic sites were more often used and were more commonly associated with areas exhibiting higher object cover (e.g., small woody debris, rocks, and vegetative cover). Most frogs move away from breeding ponds to upland areas. The distance moved is site dependent, though one recent study shows that only a few frogs move farther than the nearest suitable nonbreeding habitat (Fellers and Kleeman 2007). In this Marin County study, the farthest distance traveled was 0.87 miles and most dispersing frogs moved through grazed pastures to reach the nearest riparian habitat (Fellers and Kleeman 2007). Bulger et al. (2003) did not observe habitat preferences among frogs moving between ponds. They did note that when breeding ponds dry, California red-legged frogs use moist microhabitats of dense shrubs and herbaceous vegetation within approximately 330 feet of ponds. The California red-legged frog is known from five CNDDB occurrences within 3 miles of the Project site; the closest occurrence dates to 2004 and is located 0.03 miles north of the Project site in East Branch Green Valley Creek (CNDDB Occurrence No. 817; Figure 6). Although potentially suitable habitat occurs adjacent to the Project site within East Branch Green Valley Creek, no suitable breeding or over- summering habitat occurs on the Project site and Diablo Road and its shoulder where the Project is located do not provide suitable migration/dispersal habitat. Additionally, Diablo Road provides a heavily trafficked barrier between the closest known occurrence and the Project site. Accordingly, no impacts to California red-legged frog are anticipated from the proposed project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 30 6.2.4.5 Western Pond Turtle The western pond turtle, a California Species of Special Concern (CDFW 2021), is the only freshwater turtle native to greater California and is distributed along much of the western coast, from the Puget Sound in Washington south to the Baja Peninsula, Mexico (Storer 1930). Overall, western pond turtles are habitat generalists, and have been observed in slow-moving rivers and streams (e.g., in oxbows), lakes, reservoirs, permanent and ephemeral wetlands, stock ponds, and sewage treatment plants. They prefer aquatic habitat with refugia, such as undercut banks and submerged vegetation (Holland 1994), and require emergent basking sites, such as mud banks, rocks, logs, and root wads to thermoregulate their body temperature (Holland 1994, Bash 1999). Pond turtles are omnivorous and feed on a variety of aquatic and terrestrial invertebrates, fish, amphibians and aquatic plants. Western pond turtles regularly utilize upland terrestrial habitats, most often during the summer and winter, especially for oviposition (females), overwintering, seasonal terrestrial habitat use, and overland dispersal (Reese 1996, Holland 1994). Females have been reported ranging as far as 1,640 feet from a watercourse to find suitable nesting habitat (Reese and Welsh 1997). Nest sites are most often situated on south- or west-facing slopes, are sparsely vegetated with short grasses or forbs, and are scraped in sands or hard-packed, dry silt or clay soils (Holland 1994, Rathbun et al. 1992, Holte 1998, Reese and Welsh 1997). Western pond turtles exhibit high site fidelity, returning in sequential years to the same terrestrial site to nest or overwinter (Reese 1996). Females in southern and central California lay their clutch as early as late April to late July, although they predominantly lay in June and July. In the early morning or late afternoon, gravid females leave the water and move upland to nest (Holland 1994). Natural incubation times vary, ranging from 80 to 100+ days in California. In northern California and Oregon, hatchlings remain in the nest after hatching and overwinter, emerging in the spring. In southern and central California, those that do not overwinter emerge from the nest in the early fall (Holland 1994). The western pond turtle is known from one CNDDB occurrence within 3 miles of the Project site; this 2006 occurrence is located approximately 2.47 miles north of the Project site (CNDDB Occurrence No. 326; Figure 6). Although suitable habitat occurs adjacent to the Project site within East Branch Green Valley Creek, no suitable basking, foraging, and/or migration/dispersal habitat occurs on the Project site. Accordingly, no impacts to western pond turtle are anticipated from the proposed Project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 31 Figure 6. Closest Known Records for Special-Status Wildlife Species Within 3 Miles of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 32 Table 2. Special-Status Animal Species with Potential to Occur on the Diablo Road Trail Project Site. Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrences Mammals Antrozous pallidus pallid bat SSC Occurs in deserts, grasslands, shrublands, woodlands, and forest. Most common in open, dry, habitats with rocky area for roosting. Roost must protect bats from high temperatures. Very sensitive to disturbance of roosting sites. Unlikely. Marginal roosting habitat occurs on the Project site. Preconstruction surveys will be conducted; see text. Corynorhinus townsendii Townsend's big- eared bat SSC Have been found in a diverse array of communities, including but not limited to, evergreen forests, mixed riparian forests, agricultural areas and coastal habitats. Distribution is most strongly correlated with proximity to roosting habitats in rock cavities and caves. Unlikely. Low potential to forage within Project site. Preconstruction surveys will be conducted; see text. Vulpes macrotis mutica San Joaquin kit fox FE, CT Occurs in annual grasslands or open stages with scattered shrubby vegetation. Requires loose sandy textured soils for burrowing. None. No suitable habitat occurs on the Project site. Birds Sterna antillarum browni California least tern FE, CE, FP Occurs and nests along coastal, sandy, open areas usually around bays, estuaries, and creek and river mouths. None. No suitable habitat occurs on the Project site. Amphibians/Reptiles Ambystoma californiense California tiger salamander FT, CT, SSC Occurs in vernal and seasonal pools and associated grasslands, oak savanna, woodland, and coastal scrub. Needs underground refuges (i.e., small mammal burrows, pipes) in upland areas such as grassland and scrub habitats. None. No suitable habitat occurs on the Project site. Rana draytonii California red- legged frog FT, SSC Occurs in semi-permanent or permanent water at least two feet deep, bordered by emergent or riparian vegetation, and upland grassland, forest, or scrub habitats for aestivation and dispersal. None. No suitable habitat occurs on the Project site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 33 Scientific Name Common Name Listed Status Habitat Requirements Potential for Occurrences Emys marmorata western pond turtle SSC Occurs in rivers, ponds, and freshwater marshes, and nests in upland areas (sandy banks or grassy open fields) up to 1,640 feet from water. None. No suitable habitat occurs on the Project site. Masticophis lateralis erymanthus Alameda whipsnake FT, CT A fast-moving, diurnal predator; actively hunts with head held high. Limited range, mostly in Alameda and Contra Costa counties, utilizing chaparral, scrub, and rocky outcrops as core habitat. Also uses surrounding woodlands and grassland for foraging and dispersal. None. No suitable habitat occurs on the Project site. Rana boylii foothill yellow- legged frog west/central coast clade: CE Found in rocky streams and rivers with rocky substrate and open, sunny banks in forests, woodlands, and chaparral. May also occur in isolated pools and vegetated backwaters. None. No suitable habitat occurs on the Project site. Fish Hypomesus transpacificus delta smelt FT, CE Endemic to Sacramento-San Joaquin Delta and its tributaries extending west to Suisun and San Pablo bays. None. No suitable habitat occurs on the Project site. Invertebrates Branchinecta lynchi vernal pool fairy shrimp FT Occurs in vernal pools. Endemic to the grasslands of the Central Valley, Central Coast mountains, and South Coast mountains. None. No suitable habitat occurs on the Project site. FE=Federally listed as endangered species FT=Federally listed as threatened species FC=Federally listed as a candidate species for listing CE=California listed as endangered species CT=California listed as threatened species FP=California listed as fully protected SSC=California species of special concern DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 34 Table 3. Plant Species Observed on the Diablo Road Trail Project Site. Scientific Name Common Name Family Name Native? Aesculus californica California buckeye Sapindaceae Yes Artemisia douglasiana California mugwort Asteraceae Yes Baccharis pilularis coyote brush Asteraceae Yes Bromus diandrus ripgut brome Poaceae No Carduus pycnocephalus Italian thistle Asteraceae No Centaurea solstitialis yellow star thistle Asteraceae No Cirsium vulgare bull thistle Asteraceae No Conium maculatum poison hemlock Apiaceae No Erodium sp. filaree Geraniaceae No Eucalyptus sp. eucalyptus Myrtaceae No Festuca perennis Italian ryegrass Poaceae No Galium aparine cleavers Rubiaceae Yes Geranium dissectum cutleaf geranium Geraniaceae No Heteromeles arbutifolia toyon Rosaceae Yes Hirschfeldia incana summer mustard Brassicaceae No Hordeum brachyantherum meadow barley Poaceae Yes Hordeum murinum foxtail barley Poaceae Yes Juglans californica California black walnut Juglandaceae Yes Medicago polymorpha California burclover Fabaceae Yes Nasturtium gambelii Gambel’s yellowcress Brassicaceae Yes Olea europaea European olive Oleaceae No Prunus sp. plum Rosaceae - Quercus agrifolia coast live oak Fagaceae Yes Quercus lobata valley oak Fagaceae Yes Rumex crispus curly dock Polygonaceae Yes Sambucus sp. elderberry Adoxaceae - Silybum marianum milk thistle Asteraceae No Symphoricarpos sp. snowberry Caprifoliaceae Yes Toxicodendron diversilobum poison oak Anacardiaceae Yes Trifolium sp. clover Fabaceae - Typha angustifolia narrow leaf cattail Typhaceae Yes Urtica dioica stinging nettle Urticaceae Yes Vicia sativa spring vetch Fabaceae Yes Vinca major bigleaf periwinkle Apocynaceae No DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 35 Table 4. Wildlife Species Observed on the Diablo Road Trail Project Site. Scientific Name Common Name Birds Agelaius phoeniceus American crow Aphelocoma california California scrub-jay Baeolophus inornatus oak titmouse Buteo jamaicensis red-tailed hawk Cathartes aura turkey vulture Euphagus cyanocephalus black phoebe Junco hyemalis dark-eyed junco Melanerpes formicivorus acorn woodpecker Mimus polyglottos northern mockingbird Meleagris gallopavo wild turkey Passerella iliaca fox sparrow Mammals Otospermophilus beecheyi California ground squirrel 7.0 DISCUSSION AND IMPACT ASSESSMENT 7.1 Significance Criteria Pursuant to CEQA and CEQA Guidelines, direct and indirect adverse impacts to biological resources are classified as less than significant, potentially significant, or significant. According to CEQA Guideline § 21068, a significant effect on the environment means a substantial, or potentially substantial, adverse change in the environment. According to CEQA Guideline § 15382, a significant effect on the environment is further defined as a substantial, or potentially substantial, adverse change in any of the physical conditions within the area affected by the Project, including land, air, water, minerals, flora, fauna, ambient noise, and objects of historical or aesthetic significance. State, federal, and local jurisdictions and regulations are considered in the evaluation of significance of proposed actions. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 36 Potentially Significant Impact Less than Significant with Mitigation Incorporated Less than Significant Impact No Impact Would the project: a. Have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special-status species in local or regional plans, policies, or regulations, or by the CDFW or U.S. Fish and Wildlife Service? ☐ ☒ ☐ ☐ b. Have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations, or by the CDFW or U.S. Fish and Wildlife Service? ☐ ☒ ☐ ☐ c. Have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? ☐ ☐ ☐ ☒ d. Interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? ☐ ☐ ☐ ☒ e. Conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance? ☐ ☒ ☐ ☐ f. Conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? ☐ ☐ ☐ ☒ DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 37 7.2 Impacts Analysis a. Would the project have a substantial adverse effect, either directly or through habitat modifications, on any species identified as a candidate, sensitive, or special-status in local or regional plans, policies, or regulations, or by the California Department of Fish and Wildlife or the U.S. Fish and Wildlife Service? No special-status plant species are expected to occur on the Project site due to regular disturbance (e.g., immediate proximity to busy thoroughfare, mowing, grazing) and lack of specialized habitats and/or substrates such species require. In addition, no special-status plant species were detected during surveys conducted in the spring and winter of 2021. The Project site may provide marginally suitable habitat for two special-status bat species, pallid bat and Townsend’s big-eared bat. Furthermore, the Project site may provide suitable nesting habitat for migratory birds and raptors. As such, until preconstruction surveys are conducted to confirm or negate presence on the Project site, impacts to special-status bats and nesting birds and raptors would be potentially significant pursuant to the CEQA. Level of Significance: Less than Significant with Mitigation Incorporated 7.2.1 Impact BIO-1: Nesting Birds and Special-Status Bats Based on the database and literature review conducted during the desktop review for the proposed Project, 16 special-status animal species have been previously documented in the vicinity of the Project site (see Tables 2, Figure 6). Due to lack of suitable habitat and/or lack of recent occurrences in the vicinity of the Project site, six special-status animal species are not expected to occur and are not discussed further in this Report. These species are San Joaquin kit fox, California least tern, California tiger salamander, Alameda whipsnake, delta smelt, and vernal pool fairy shrimp. Potential constraints and proposed mitigations associated with each remaining resource with potential to occur on-site, including nesting migratory birds and raptors and roosting bats, are provided below. Level of Significance before Mitigation: Potentially Significant Mitigation Measures: BIO-1a: Migratory Birds and Raptors/Nest Avoidance Tree and vegetation clearing (removal, pruning, trimming, and mowing) shall be scheduled to occur outside the migratory bird nesting season (February 1 through August 31). However, if clearing and/or construction activities will occur during the migratory bird nesting season, then preconstruction surveys to identify active migratory bird and/or raptor nests shall be conducted by a qualified biologist within 14 days of construction initiation on the Project site and within 300 feet (i.e., zone of influence) of DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 38 Project-related activities. The zone of influence includes areas outside the Project site where birds could be disturbed by construction-related noise or earth-moving vibrations. If active nest, roost, or burrow sites are identified within the Project site, a no-disturbance buffer shall be established for all active nest sites prior to commencement of any proposed Project-related activities to avoid construction or access-related disturbances to migratory bird nesting activities. A no-disturbance buffer constitutes a zone in which proposed Project-related activities (e.g., vegetation removal, earth moving, and construction) cannot occur. A minimum buffer size of 50 feet for passerines and 300 feet for raptors will be implemented; sizes of the buffers shall be determined by a qualified biologist based on the species, activities proposed near the nest, and topographic and other visual barriers. Buffers shall remain in place until the young have departed the area or fledged and/or the nest is inactive, as determined by the qualified biologist. If work is required within a buffer zone of an active bird nest, work may occur under the supervision of a qualified avian biologist. The qualified avian biologist monitoring the construction work will have the authority to stop work and adjust buffers if any disturbance to nesting activity is observed. BIO-1b: Roosting Bats A qualified biologist shall be hired to conduct surveys for special-status bats (pallid bat and Townsend’s big-eared bat) no more than two weeks prior to planned commencement of construction activities that have the potential to disturb bat day roosts or maternity roosts through elevated noise levels or removal of trees. If a visual survey is not sufficient to determine the presence/absence of bats, acoustic equipment (e.g., AnaBat) shall be used to determine potential occupancy type of species present. If an active maternity roost is detected, a qualified biologist shall determine an appropriate avoidance buffer to be maintained from April 1 until young are flying (typically through August). If an active day roost is detected in a tree or structure planned for removal, or within a zone of influence (i.e., noise, vibration) that could result in roost abandonment, as determined by a qualified biologist, the bats shall be safely evicted under the guidance of a qualified biologist. Day roosts shall not be removed unless the daytime temperature is at least 50 degrees Fahrenheit and there is no precipitation. Mitigation for day roosts impacted by the Project will be achieved through the installation of bat houses on-site to replace lost roosts at a 1:1 ratio. Replacement roosts will be placed at the discretion of the qualified biologist. Level of Significance after Mitigation: Less than Significant DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 39 b. Would the project have a substantial adverse effect on any riparian habitat or other sensitive natural community identified in local or regional plans, policies, or regulations, or by the California Department of Fish and Wildlife or U.S. Fish and Wildlife Service? 7.2.2 Impact BIO-2. Riparian Habitat and Waters of the United States/State The bed, bank, and channel and associated riparian vegetation of East Branch Green Valley Creek are subject to CDFW jurisdiction under Section 1600 of CFGC. In addition, areas within the riparian corridor and below top-of-bank may be regulated by RWQCB. Accordingly, prior to any impacts to the bed, bank, and/or channel and associated riparian vegetation/canopy of East Branch Green Valley Creek, authorization from CDFW/RWQCB shall be required prior to project commencement. Impacts could be mitigated to a level considered less than significant. Level of Significance: Less than Significant with Mitigation Incorporated Mitigation Measures: BIO-2a: Obtain CDFW Section 1600 Lake or Streambed Alteration Agreement If project activities encroach on the riparian zone of East Branch Green Valley Creek, the Project proponent shall submit a Section 1600 Notification of Lake or Streambed Alteration application to CDFW. The Notification will include a description of impacts, including quantification of impacts to bed, bank, and channel, as well as individual trees, area and linear footage of riparian vegetation, and proposed mitigation for impacts. It is likely that CDFW will require tree replacement mitigation compensation as a condition of the Lake or Streambed Alteration Agreement. Accordingly, the applicant proposes to mitigate for any impacts to native trees greater than 4 inches in diameter at breast height (DBH) via on- site replacement at a 3:1 (replacement to impacts) ratio. This tree replacement mitigation proposal to compensate for the project’s potential encroachment into the riparian canopy will likely satisfy mitigation requirements stipulated by CDFW. In consideration of overall Project site aesthetics, replacement trees shall be planted near East Branch Green Valley Creek to contribute to the existing riparian canopy associated with this waterway. The trees’ health shall be monitored annually for 5 years by a qualified biologist or arborist and documented in annual monitoring reports. At the end of the 5-year monitoring period, at least 70 percent of planted trees shall be in good health. If survival is below 70 percent, additional trees shall be planted to bring the total number of planted trees up to 100 percent of the original number of trees planted. Irrigation and follow-up monitoring shall be established over an additional 3-year period following any replanting. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 40 BIO-2b: Obtain RWQCB Waste Discharge Requirements Permit If project activities encroach on areas, including the riparian zone and canopy of East Branch Green Valley Creek and below top-of-bank, or other areas potentially regulated by the RWQCB, the Project proponent shall submit a report of Waste Discharge in order to obtain WDRs and/or file a completed federal National Pollutant Discharge Elimination System (NPDES) permit application form with the San Francisco Bay RWQCB, as appropriate. In addition, the Project proponent shall develop a SWPPP that will be submitted to the Town of Danville as a condition of project approval demonstrating BMPs that shall be installed/implemented prior to Project commencement. Stormwater protection and treatment measures shall be implemented to ensure that the proposed Project remains in compliance with the Porter-Cologne Act and that discharges of dredged or fill material do not enter waters of the State. Level of Significance after Mitigation: Less than Significant c. Would the project have a substantial adverse effect on state or federally protected wetlands (including, but not limited to, marsh, vernal pool, coastal, etc.) through direct removal, filling, hydrological interruption, or other means? Level of Significance: No Impact d. Would the project interfere substantially with the movement of any native resident or migratory fish or wildlife species or with established native resident or migratory wildlife corridors, or impede the use of native wildlife nursery sites? This Project site does not currently provide a movement corridor for any wildlife species, nor does it provide nursery sites for any species. the proposed Project will not impact fish or wildlife movement, movement corridors, or nursery sites. Level of Significance: No Impact e. Would the project conflict with any local policies or ordinances protecting biological resources, such as a tree preservation policy or ordinance? Level of Significance: Less than Significant with Mitigation Incorporated 7.2.3 Impact BIO-3: Town of Danville Tree Preservation Ordinance The Town of Danville’s Tree Preservation Ordinance (Municipal Code, Section 32-79) requires acquisition of a Tree Removal Permit prior to removal of certain trees within the City Limits. These impacts could be mitigated to a level considered less than significant. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 41 Level of Significance before Mitigation: Potentially Significant Mitigation Measures: BIO-3: Tree Protection Trees on the Project site are subject to the Town of Danville’s Tree Preservation Ordinance. If trees are slated for removal as part of the proposed Project, the Project developer’s consulting arborist shall prepare an arborist report to ensure protected, heritage, and or memorial trees are identified and considered for preservation. At least 90 days prior to project initiation, a Tree Removal Application shall be submitted to the Town for review and for acquisition of a Tree Removal Permit, if required. The Town will consider the following criteria upon receipt of the application and prior to issuing a permit: 1. The condition of the tree with respect to its health, imminent danger of falling, proximity to existing structures, and interference with utility infrastructure; 2. The necessity to remove the tree to allow for the reasonable use, enjoyment, or development of the property; 3. The age and size of the protected tree with regard to the appropriate size of the area in which the tree is planted, and if removal would encourage healthy, more vigorous growth of other plant materials in the area; 4. Planning Commission may authorize removal if the tree is unreasonably adversely impacting the use of the property. Mitigation would be required; 5. The effect of the removal in relation to soil erosion and surface water flow; 6. The number of species, size, and location of other protected trees in the area and the effect of the removal as it pertains to shade, privacy between properties, and scenic beauty of the area; 7. Possible visual impacts within a Town-identified Major Ridgeline or Scenic Hillside Area. To compensate for the removal of any trees protected by the Town of Danville’s Tree Protection Ordinance, the Project developer shall ensure the protection (i.e., health and safety) of trees to be retained and provide mitigation for trees authorized by the Town for removal. Accordingly, the Project developer’s consulting arborist shall calculate the total inches of diameter of Town- protected trees and submit that calculation to the Town’s Planning Division for review. The Project developer shall be required to replace on-site the Town-protected trees to be removed DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 42 with a number, size, and appropriate species of trees (or approved alternate species) equal to the total inches of the diameter of the trees to be removed. If tree mitigation planting cannot be accommodated on the Project site, mitigation may be handled through the Project developer's payment of an in-lieu fee, which shall be made payable to the Town of Danville. In-lieu mitigation funds received by the Town may be applied to an account chosen by the Town to allow the purchase and planting of trees (e.g., beautification trees) within the Town of Danville. f. Would the project conflict with the provisions of an adopted Habitat Conservation Plan, Natural Community Conservation Plan, or other approved local, regional, or state habitat conservation plan? Level of Significance before Mitigation: No Impact DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 43 8.0 REFERENCES Baldwin D.H, Goldman D.H., Keil D.J., Patterson R, Rosatti T.J., Wilken D.H. (ed.). 2012. The Jepson Manual Vascular Plants of California: Second Edition. University of California Press, Berkeley. 1568 pps. Bash, J. S. 1999. The role of wood in the life cycle of western pond turtles (Clemmys marmorata). Unpublished final report to ELWD Systems, a division of Forest Concepts LLC. 14 pp. Beier, P. and S. Loe. 1992. "In my experience.." a checklist for evaluating impacts to wildlife movement corridors. Wildlife Society Bulletin Vol. 20(4): 6. Bourque, R.M. 2008. Spatial Ecology of an Inland Population of the Foothill Yellow-legged Frog (Rana boylii) in Tehama County, California. Master’s Thesis. Humboldt State University. Bulger, J.B., N.J. Scott Jr. and R. Seymour. 2003. Terrestrial Activity and Conservation of Adult California Red-Legged Frogs Rana aurora draytonii in Coastal Forests and Grasslands. Biological Conservation. Vol. 110: pp. 85-95. Calfish. 2021. Calfish Tabular Data Query; [accessed 2021 December]. Website: https://www.calfish.org/DataandMaps/CalFishTabularData.aspx California Natural Diversity Data Base (CNDDB). 2021. RareFind 5. Computer Printout for Special-Status Species Within a 3-Mile Radius of the Project Site. California Natural Heritage Division, California Department of Fish and Wildlife, Sacramento, CA. California Native Plant Society (CNPS). 2001. Inventory of rare and endangered plants of California (Sixth Edition). Rare plant scientific advisory committee, David P. Tibor, convening editor. California Native Plant Society. Sacramento, CA. 338 pps. California Native Plant Society (CNPS). Rare Plant Program. 2021. Inventory of Rare and Endangered Plants of California. Accessed 2021 December. Website: http://www.rareplants.cnps.org California Department of Fish & Wildlife (CDFW). 2016. Complete list of amphibian, reptile, bird and mammal species in California. Published September 2008; updated May 2016. California Department of Fish & Wildlife (CDFW). 2021. Special Animals List. California Natural Diversity Database. Wildlife and Habitat Data Analysis Branch. Updated October 2021. Fellers, G.M., editor. 1994. California/Nevada declining amphibian working group. Newsletter 1, 1 May 1994. 10 pp. Fellers, G.M., and P.M. Kleeman. 2007. California Red-Legged Frog (Rana draytonii) Movement and Habitat Use: Implications for Conservation. Journal of Herpetology 41:276–286. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 44 Fitch, H.S. 1936. Amphibians and Reptiles of the Rogue River Basin, Oregon. American Midland Naturalist 17(3):634–652. Google Earth Pro. 2021. 3D map, Buildings data layer; [accessed 2021 December]. Website: http://www.google.com/earth/index.html Hayes, M.P. and M.R. Jennings. 1988. Habitat Correlates of Distribution of the California Red-legged Frog (Rana aurora draytonii) and the Foothill Yellow-Legged Frog (Rana boylii): Implications for Management. pp. 144-158 In: Szaro, Robert C., Kieth E. Severson and David R. Patton (technical coordinators). July 19-21, 1988. Proceedings of the symposium on the management of amphibians, reptiles and small mammals in North America. United States Department of Agriculture, Forest Service, General Technical Report (GTR)-166. Hermanson, J.W., and T.J. O’Shea. 1983. Antrozous pallidus. Mammalian Species 213:1-8. Holland, D.C. 1994. The western pond turtle: habitat and history. Portland, OR: U.S. Department of Energy, Bonneville Power Administration. Holte, D. L. 1998. Nest site characteristics of the western pond turtle, Clemmys marmorata, at Fern Ridge Reservoir, in west central Oregon. MS Thesis, Oregon State University, Corvallis, Oregon. Jennings, M.R., and M.P. Hayes. 1984. Pre-1900 Overharvest of the California Red-Legged Frog (Rana aurora draytonii): The Inducement for Bullfrog (Rana catesbeiana) Introduction. Herpetologica 41(1):94-103. Jennings, M.R., M.P. Hayes, and Research Section, Animal Management Division, Metro Washington Park Zoo. 1994. Amphibian and Reptile Species of Special Concern in California. Final Report Submitted to the California Department of Fish & Game, Inland Fisheries Division. Rancho Cordova, CA. 255 pp. November 1. Kupferberg, S.J. 1996. Hydrologic and geomorphic factors affecting conservation of a river-breeding frog (Rana boylii). Ecological Applications 6:1332–1344. Natural Resource Conservation Service (NRCS). 2021a. Web Soil Survey. Website at: http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx. Natural Resource Conservation Service (NRCS). 2021b. Lists of hydric soils. Website at: https://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/use/hydric/. Rathbun, G. B., N. Seipel, and D. Holland. 1992. Nesting behavior and movements of western pond turtles. Clemmys marmorata. Southwest. Nat. 37(3):319-324. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 45 Reese, D. A. 1996. Comparative demography and habitat use of western pond turtles in northern California: the effects of damming and related alterations. Dissertation, University of California at Berkeley, Berkeley, California, USA. Reese, D.A.; Welsh, Hartwell H., Jr. 1997. Use of terrestrial habitat by western pond turtles (Clemmys marmorata): implications for management. Pages 352-357 in Proceedings: Conservation, Restoration, and Management of Turtles and Tortoises. An International Conference. New York Turtle and Tortoise Society. Sherwin, R., and D.A. Rambaldini. 2005. Pallid Bat (Antrozous pallidus). Species Account. Western Bat Working Group. Website: http://wbwg.org/speciesinfo/species_accounts/species_accounts.html Stebbins, R.C., and McGinnis, S.M. 2012. Field Guide to Amphibians and Reptiles of California. New York, NY: Houghton Mifflin Company. Storer, T.I. 1925. A synopsis of the amphibia of California. University of California Publications in Zoology 27:1-342. Storer, T. I. 1930. Notes on the range and life-history of the Pacific fresh-water turtle, Clemmys marmorata. Univ. Calif. Publ. Zool. 32:429-441. Tatarian, P. J. 2008. Movement Patterns of California Red-Legged Frogs (Rana Draytonii) in an Inland California Environment. Herpetological Conservation and Biology 3(2):155-169. November. U.S. Climate Data. 2021. [accessed 2021 December]. Website: https://www.usclimatedata.com/climate/walnut-creek/california/united-states/usca2120 U.S. Fish & Wildlife Service (USFWS). 1996. Sacramento Fish & Wildlife Office Guidelines for Conducting and Reporting Botanical Inventories for Federally Listed, Proposed and Candidate Plants. Prepared September 23, 1996. Endangered Species Information. U.S. Fish & Wildlife Service (USFWS). 2002. Recovery plan for the California red-legged frog (Rana aurora draytonii). U.S. Fish and Wildlife Service, Portland, Oregon. Viii + 173 pps. U.S. Fish & Wildlife Service (USFWS). 2021a. Information for Planning and Consultation (IPaC); [accessed 2021 December]. Website: https://ecos.fws.gov/ipac/ U.S. Fish & Wildlife Service (USFWS). 2021b. Critical Habitat Portal; [accessed 2021 December]. Website: http://ecos.fws.gov/crithab U.S. Fish & Wildlife Service (USFWS). 2021c. National Wetlands Inventory; [accessed 2021 December]. Website: https://www.fws.gov/wetlands/ DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 46 Zeiner, D.C., W.F. Laudenslayer, Jr., K.E. Mayer, and M. White. 1988. California's wildlife, volume I, amphibians and reptiles. State of California, the Resources Agency, Department of Fish and Game, Sacramento, California. Zweifel, R.G. 1955. Ecology, Distribution, and Systematics of Frogs of the Rana boylii Group: University of California Publications. Zoology 54(4):207–292. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 A-1 Appendix A Aquatic Resources Delineation Report DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Aquatic Resources Delineation Report Diablo Road Trail Project Town of Danville, California June 2022 Prepared on behalf of: Town of Danville 510 La Gonda Way Danville, CA 94526 (925) 314-3388 Prepared by: Sequoia Ecological Consulting, Inc. 1342 Creekside Drive Walnut Creek, CA 94596 (925) 855-5500 Contact: Andrew Ford DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 i CONTENTS 1.0 INTRODUCTION .....................................................................................................................1 2.0 APPLICANT ............................................................................................................................1 3.0 LOCATION AND SETTING ........................................................................................................1 4.0 WETLAND DELINEATION METHODS ........................................................................................4 5.0 WETLAND DELINEATION RESULTS ...........................................................................................4 5.1 Topography and Hydrology.............................................................................................................. 4 5.2 Soils .................................................................................................................................................. 5 5.3 Vegetation ........................................................................................................................................ 7 6.0 AGENCY JURISDICTION ...........................................................................................................9 6.1 Potential USACE Jurisdiction ............................................................................................................ 9 6.2 Potential State Jurisdiction ............................................................................................................ 11 7.0 LIMITATIONS ....................................................................................................................... 12 8.0 REFERENCES ........................................................................................................................ 13 FIGURES Figure 1. Regional Map of the Diablo Road Trail Project Site. ...................................................................... 2 Figure 2. Location Map of the Diablo Road Trail Project Site. ...................................................................... 3 Figure 3. Soil Types on the Diablo Road Trail Project Site. ........................................................................... 6 TABLES Table 1. Wetland Plant Indicator Status. ...................................................................................................... 8 Table 2. Potentially Jurisdictional Aquatic Resources Delineated in the Study Area. .................................. 9 APPENDICES Appendix A. Wetland Delineation Data Forms Appendix B. Draft Aquatic Resources Delineation Map Appendix C. Project Site Representative Photographs Appendix D. Plant Species Observed on the Diablo Road Trail Project Site DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 1 1.0 INTRODUCTION On behalf of the Town of Danville (Applicant), Sequoia Ecological Consulting, Inc. (Sequoia) conducted a delineation of aquatic resources potentially regulated under section 404 of the federal Clean Water Act (CWA) and the State Water Resources Control Board (SWRCB) State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State, for the Town of Danville’s Diablo Road Trail Project (Project). The proposed Project extends along Diablo Road between Fairway Drive to the west and Ave Nueva to the east in the Town of Danville, California (Figures 1 and 2). The “study area” for the aquatic resource delineation consisted of the entire alignment of the proposed Project and covers approximately 6.5 acres over approximately 0.9 miles along the southern shoulder of Diablo Road (Figure 1). 2.0 APPLICANT Town of Danville 510 La Gonda Way Danville, CA 94526 Contact: Nader Salama Phone: (925) 314-3349 3.0 LOCATION AND SETTING The proposed Project is located along Diablo Road in the Town of Danville, Contra Costa County, California, approximately 0.59-mile east of Interstate 680 and five miles from the western entrance of Mt. Diablo State Park (Figures 1 and 2). The Project site is located within private lands and winds along Diablo Road from the intersection of Fairway Drive to Blackhawk Road to the east. The Project site is located immediately north of East Branch Green Valley Creek, along the shoulder of Diablo Road and property belonging to the Magee Cattle Ranch, and south of single-family residential development. The Project site is characterized as highly disturbed, ruderal (weedy) habitat with overhanging mixed riparian woodland canopy and nonnative annual grassland. Consequently, due to the location of the Project site along the shoulder of a busy thoroughfare and the subsequent regular disturbance regime, native habitats on the Project site are absent. The proposed Project consists of construction of an 8- to 10-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. This trail will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east (Figure 2). Also included is a pedestrian and bicycle roadway crossing at the intersection of Diablo Road in the vicinity of Fairway Drive. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 2 Figure 1. Regional Map of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 3 Figure 2. Location Map of the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 4 4.0 WETLAND DELINEATION METHODS Prior to the field delineation, available reference materials were reviewed, including the Natural Resources Conservation Service’s (NRCS) Web Soil Survey (2021a), hydric soils lists (NRCS 2021b), the National Wetlands Inventory (NWI; USFWS 2021), National Hydrography Dataset (NHD; USGS 2021), geologic data (California Geological Survey 2010), topographic maps (USGS 2021), and aerial imagery. A routine-level aquatic resource delineation was conducted on the Project site on December 9, 2021. The Project site was field checked for indicators of hydrophytic vegetation, wetland hydrology, and hydric soils. During the aquatic resource delineation, 12 sample points were taken on the study area and recorded on U.S. Army Corps of Engineers (USACE) data forms provided in the Regional Supplement to the U.S. Army Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0) (Arid West Manual; USACE 2008). USACE data forms are included in Appendix A. This aquatic resource delineation was conducted in accordance with the Arid West Manual and the U.S. Army Corps of Engineers Wetlands Delineation Manual (USACE Manual; Environmental Laboratory 1987). Based on the presence or absence of field indicators—including vegetation, hydrology, and soils—the limits of potential jurisdictional wetlands and other waters of the United States were determined. In addition to potential jurisdictional wetlands, this study evaluated the presence of any waters of the United States other than wetlands potentially subject to jurisdiction under Section 404 of the CWA. “Other waters” are seasonal or perennial water bodies, such as lakes, stream channels, drainages, ponds, and other surface water features that exhibit an Ordinary High-Water Mark (OHWM) but lack positive indicators of one or more of the three wetland parameters (hydrophytic vegetation, wetland hydrology, hydric soils) (Federal Register 1994). In non-tidal “other waters,” USACE jurisdiction extends to the OHWM, defined as “that line on the shore established by the fluctuations of water and indicated by physical characteristics such as clear, natural line impressions on the bank, shelving, changes in the characteristics of the soil, destruction of terrestrial vegetation, the presence of litter and debris” (Federal Register 1994; USACE 2005; 2008). Potential jurisdictional wetlands and other waters were mapped with a Trimble GPS unit (sub-meter accuracy) and overlain on a digital orthophoto using ArcGIS mapping software (Appendix B). 5.0 WETLAND DELINEATION RESULTS 5.1 Topography and Hydrology The eastern portion of the Project site features undulating topography located within regularly grazed non-native annual grassland. The topography generally slopes from south to north throughout this part of the site, with the Magee Cattle Ranch property upslope and Diablo Road downslope from the Project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 5 Water from sheet flow runoff and direct precipitation converges at topographic low points between multiple hill peaks, before being conveyed by swale- and drainage-like features. The extent of these features is limited to several swales and alluvial features that intersect with the Project site; however, several drainages with incised channels are present in the vicinity but fall outside of and upslope from the Project footprint, within the adjacent Magee Cattle Ranch property. The western portion of the Project site is located along the shoulder of Diablo Road and its topography is consistent with the road alignment. East Branch Green Valley Creek, a perennial waterway and blueline stream (Figure 2), lies directly south of the westernmost portion of the proposed Project. A portion of East Branch Green Valley Creek (PW1) is located just outside the southern boundary of the Project site but within the study area; the extent of PW1 within the study area is approximately 0.689- acre (Appendix B). This feature is a perennial drainage characterized by a deeply incised channel, with a clearly defined bed and bank, and abrupt banks. The creek contained flowing water and in-channel pools at the time of the survey, and indicators of OHWM were observed. 5.2 Soils Two soil types occur within the study area, as mapped by the NRCS (Figure 3). The mapped soil units are Cropley clay, 2 to 5 percent slopes and Botella clay loam, 0 to 2 percent slopes (NRCS 2021). Sequoia dug test pits dug at each sample site to confirm that soils were consistent with the descriptions provided by the NRCS. The mapped soil units are: • Cropley clay, 2 to 5 percent slopes • Botella clay loam, 0 to 2 percent slopes, MRLA 14 A total of 12 soil pits were dug by shovel to a maximum depth of 12 inches at locations representative of various hydrogeomorphic surface conditions (Sheet 1). Soil colors were characterized based on the Munsell Soil Book of Color (2012). The soil colors in wetland positions across the study area were 10YR 2/1, 10YR 2/2, 10YR 3/2, and 10YR 4/2 with prominent redoximorphic features. Each soil sample was generally clay or loamy clay texture with many featuring intrusions or strata of sand. The upland positions were 10YR 3/2 and 10YR 3/3 with insufficient or absent redoximorphic features, and a high sand content. Redoximorphic features (5YR 4/6, 5YR 5/6, and 7.5YR 4/4) were prominent throughout the wetland sample points and were seen at high enough concentrations to qualify for the Redox Dark Surface (F6) hydric soil indicator (Field Indicators of Hydric Soils in the United States). Additionally, criteria were met for the Depleted Matrix (F3) hydric soil indicator, as a matrix of 10YR 4/2 with redoximorphic features of 5YR 4/4) were observed at Sample 1B. Soils observed in the sample pits within the study area are described on USACE wetland delineation data forms in Attachment B (Sheet 1). A soil map is provided as Figure 3. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 6 Figure 3. Soil Types on the Diablo Road Trail Project Site. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 7 5.2.1 Cropley Clay, 2 to 5 Percent Slopes The Cropley series consists of very deep, moderately well and well drained soils that formed in alluvium from mixed rock sources. They are found on alluvial fans, floodplains and in small basins. Slopes range from 0 to 15 percent. Vegetative cover consists of annual grasses and forbs. Elevations range from 10 to 2100-feet elevation. The mean annual rainfall is about 12 to 30-inches and the mean annual temperature is about 57 to 62 degrees F. Frost free season is 200 to 330 days and up to 360 days along the coast. The Alo, Altamont, Diablo, Antioch, Salinas and Sorrento soils are the main associated soils. The surface layer is very dark gray clay 0 to 33 inches thick. The next layer is brown sandy clay loam 33 to 63 inches thick. It is slightly to moderately effervescent. Texture throughout the profile ranges from clay to silty clay loam but is clay in most places. The parent rock, at a depth of 24 to 48 inches is soft, calcareous, interbedded shale and medium-grained sandstone. Cropley soils are used for irrigated row and truck crops, irrigated and dry pasture, apricots, prunes and for urban development. Vegetation in uncultivated or undeveloped areas is annual grasses and forbs with some scattered live oak. Cropley Clay, 2 to 5 percent slopes is not classified as a hydric soil by the NRCS. 5.2.2 Botella Clay Loam, 0 to 2 Percent Slopes, MRLA 14 The Botella series consists of very deep, well-drained soils that formed in alluvial material from sedimentary rocks. They are found on small valley bottoms and on alluvial fans. Slopes range from 0 to 15 percent. Vegetative cover consists of annual grasses and forbs. Elevations range from 50 to 2100-feet elevation. The mean annual rainfall is about 12 to 25-inches and the mean annual temperature is about 62 to 72 degrees F. Frost free season is 250 to 350 days. The Betteravia, Clear Lake, Crow Hill, Elder, Los Osos, Santa Lucia, and Zamora soils are the main associated soils. The surface layer is very dark gray clay 0 to 33 inches thick. The next layer is brown sandy clay loam 33 to 63 inches thick. It is slightly to moderately effervescent. Texture throughout the profile ranges from clay to silty clay loam but is clay in most places. The parent rock, at a depth of 24 to 48 inches is soft, calcareous, interbedded shale and medium-grained sandstone. Botella soils are used for growing field, forage, truck crops, and orchards and non-irrigated grain pasture, hay, and range. Some areas are used for urban development. Uncultivated areas have a cover of annual grasses and forbs with scattered oak trees and coastal sagebrush in some areas. Botella clay loam, 0 to 2 percent slopes, MRLA 14 is not classified as a hydric soil by the NRCS. 5.3 Vegetation On December 9, 2021, Sequoia biologists surveyed the study area to characterize the vegetation communities and document plant species present within the study area. Nomenclature used for plant names follows The Jepson Manual Second Edition (Baldwin 2012). Habitat affinities were assigned DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 8 following the classification of Lichvar et.al (2014), as updated in 2016 and include the categories shown in Table 1 below. Table 1. Wetland Plant Indicator Status. Wetland Indicator Status Definition OBL – Obligate Occur over 99% of the time in wetlands FACW – Facultative Occur 33 to 67% of the time in wetlands FACU – Facultative Upland Occur 1 to 33% of the time in wetlands UPL - Upland Occur less than 1% of the time in wetlands NI – Non-Indicator No classification given due to lack of information Wetland indicator species (i.e., species that can tolerate soil saturation during grow period and/or prolonged inundation) are those classified as OBL, FACW, and FAC and listed in the National Wetland Plant List (USACE 2020). Three (3) vegetation communities occur in the study area (Sawyer and Keeler-Wolf 1995) and are further described below. 5.3.1.1 Ruderal Ruderal herbaceous habitat is prevalent within the study area. Ruderal communities are groupings of plants that thrive in areas disturbed by human activity. Ruderal vegetation is adapted to high levels of disturbance and endures for long periods of time in areas that have continual disturbance. Dominant grass and forb species observed within ruderal communities in the study area include black mustard (Brassica nigra), bristly ox-tongue (Helminthotheca echioides), California burclover (Medicago polymorpha), poison hemlock (Conium maculatum), and yellow star thistle (Centaurea solstitialis). 5.3.1.2 Non-native Annual Grassland The study area is dominated by non-native annual grassland. This community is comprised primarily of plant species that mature in spring and early summer, before spreading seed and dying in late summer and fall. Non-native annual grassland is abundant within the study area, particularly in the eastern portion. Dominant grass and forb species observed within non-native annual grassland in the study area include slender wild oat (Avena barbata), ripgut brome (Bromus diandrus), soft chess (Bromus hordeaceus) Italian thistle (Carduus pycnocephalus ssp. pycnocephalus), and filaree species (Erodium botrys, E. cicutarium). 5.3.1.3 Riparian Woodland Riparian woodlands are diverse habitats that support numerous plant species that can include grasses, annual and perennial forbs, vines, shrubs, and trees. A variety of plants creates a complex layering of understory and overstory, which in turn provides habitat to numerous wildlife species. When found within the bed, channel, or bank of any river, stream, or lake, riparian vegetation is also protected under DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 9 Section §1602 of the California Fish and Game Code; and the California Department of Fish and Wildlife (CDFW) has included riparian communities in the California Natural Diversity Database. Riparian woodland habitat is present within and surrounding Green Valley Creek (PD1), which flows through the western portion of the study area and just south of the Project site. Dominant plant species observed within riparian woodland communities on the Project site include Italian ryegrass (Festuca perennis), mugwort (Artemisia douglasiana), cattail (Typha sp.), giant reed (Arundo donax), mulefat, willows (Salix exigua, S. laevigata, and S. losiolepis), and Fremont cottonwood (Populus fremontii). 6.0 AGENCY JURISDICTION One aquatic resources was identified on the study area during the December 2021 delineation: perennial drainage. Details on this aquatic resources is summarized in Table 2, and potential regulatory jurisdiction over this feature are discussed below. Table 2. Potentially Jurisdictional Aquatic Resources Delineated in the Study Area. Feature Name Area (ft2) Length (ft) Acre(s) Avg Width (ft) Sample Point Bed/Bank /OHWM Hydrology Cowardin Class Latitude, Longitude Potential USACE and State Jurisdiction PD1 30,012 - 0.689 50 - Yes, All Perennial Riverine 37.83480, -121.96689 6.1 Potential USACE Jurisdiction On January 23, 2020, the Environmental Protection Agency (EPA) and the USACE finalized the Navigable Waters Protection Rule to define “waters of the U.S.” The rule took effect on June 22, 2020. On August 30, 2021, the U.S. District Court for the District of Arizona vacated and remanded the Navigable Waters Protection Rule in the case of Pascua Yaqui Tribe v. U.S. Environmental Protection Agency. According to the EPA (2021): “In light of this order, the agencies have halted implementation of the Navigable Waters Protection Rule and are interpreting “waters of the United States” consistent with the pre-2015 regulatory regime until further notice. The agencies continue to review the order and consider next steps. This includes working expeditiously to move forward with the rulemakings announced on June 9, 2021, in order to better protect our nation’s vital water resources that support public health, environmental protection, agricultural activity, and economic growth. The agencies remain committed to crafting a durable definition of “waters of the United States” that is informed by diverse perspectives and based on an inclusive foundation. The agencies are interpreting “waters of the United States” consistent with the pre-2015 regulatory regime until further notice … The term waters of the United States means: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 10 1. All waters which are currently used, or were used in the past, or may be susceptible to use in interstate or foreign commerce, including all waters which are subject to the ebb and flow of the tide; 2. All interstate waters including interstate wetlands; 3. All other waters such as intrastate lakes, rivers, streams (including intermittent streams), mudflats, sandflats, wetlands, sloughs, prairie potholes, wet meadows, playa lakes, or natural ponds, the use, degradation or destruction of which could affect interstate or foreign commerce including any such waters: a. Which are or could be used by interstate or foreign travelers for recreational or other purposes; or b. From which fish or shellfish are or could be taken and sold in interstate or foreign commerce; or c. Which are used or could be used for industrial purposes by industries in interstate commerce; 4. All impoundments of waters otherwise defined as waters of the United States under this definition; 5. Tributaries of waters identified in paragraphs (s)(1) through (4) of this section; 6. The territorial sea; 7. Wetlands adjacent to waters (other than waters that are themselves wetlands) identified in paragraphs (s)(1) through (6) of this section; waste treatment systems, including treatment ponds or lagoons designed to meet the requirements of CWA (other than cooling ponds as defined in 40 CFR 423.11(m) which also meet the criteria of this definition) are not waters of the United States. Waters of the United States do not include prior converted cropland. Notwithstanding the determination of an area’s status as prior converted cropland by any other federal agency, for the purposes of the Clean Water Act, the final authority regarding Clean Water Act jurisdiction remains with EPA” (EPA 2021). According to guidance present prior to the pre-2015 regulatory regime (EPA 2008): “The agencies will assert jurisdiction over the following waters: • Traditional navigable waters • Wetlands adjacent to traditional navigable waters • Non-navigable tributaries of traditional navigable waters that are relatively permanent where the tributaries typically flow year-round or have continuous flow at least seasonally (e.g., typically three months) • Wetlands that directly abut such tributaries The agencies will decide jurisdiction over the following waters based on a fact-specific analysis to determine whether they have a significant nexus with a traditional navigable water: • Non-navigable tributaries that are not relatively permanent DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 11 • Wetlands adjacent to non-navigable tributaries that are not relatively permanent • Wetlands adjacent to but that do not directly abut a relatively permanent non-navigable tributary The agencies generally will not assert jurisdiction over the following features: • Swales or erosional features (e.g., gullies, small washes characterized by low volume, infrequent, or short duration flow) • Ditches (including roadside ditches) excavated wholly in and draining only uplands and that do not carry a relatively permanent flow of water The agencies will apply the significant nexus standard as follows: • A significant nexus analysis will assess the flow characteristics and functions of the tributary itself and the functions performed by all wetlands adjacent to the tributary to determine if they significantly affect the chemical, physical and biological integrity of downstream traditional navigable waters • Significant nexus includes consideration of hydrologic and ecologic factors” Based on current guidance (EPA 2008; 2021), the perennial drainage (PD1) delineated in the study area would presumably qualify as “Non-navigable tributaries of traditional navigable waters that are relatively permanent where the tributaries typically flow year-round or have continuous flow at least seasonally (e.g., typically three months)” and therefore fall under USACE jurisdiction. Sequoia acknowledges that regulatory analysis described above is preliminary and only the USACE can determine jurisdiction over aquatic resources. Due to recent changes based on court decisions, regulatory jurisdiction is in flux, and therefore the USACE would need to determine its jurisdiction in the study area based on a verification of this report. 6.2 Potential State Jurisdiction On April 2, 2019, the SWRCB adopted a State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State (Procedures), for inclusion in the Water Quality Control Plan for Inland Surface Waters and Enclosed Bays and Estuaries and Ocean Waters of California. The Procedures took effect May 28, 2020. The Procedures consist of four major elements: (1) a wetland definition; (2) a framework for determining if a feature that meets the wetland definition is a water of the state; (3) wetland delineation procedures; and (4) procedures for the submittal, review and approval of applications for Water Quality Certifications and Waste Discharge Requirements for dredge or fill activities. Aquatic resources (such as ephemeral tributaries, some drainage ditches, and isolated wetlands), which may be exempt from federal jurisdiction under the Navigable Waters Protection Rule would likely be considered waters of the State under the Porter-Cologne Water Quality Control Act and/or the Procedures that took effect May 28, 2020. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 12 Based on the Procedures, the perennial drainage within the study area would likely qualify as “Waters of the State” subject to jurisdiction by the SWRCB, as discussed above. Work, such as placement of fill material, occurring within USACE jurisdiction normally requires a permit under Section 404 of the federal CWA. In addition, the USACE, under Section 401 of the federal CWA, is required to meet state water quality regulations prior to granting a Section 404 permit. This is accomplished by application to the local RWQCB for Section 401 certification that requirements have been met. Streams, rivers, and lakes up to the top of bank or dripline of riparian vegetation (whichever is greater) also fall within the jurisdiction of the California Department of Fish and Wildlife (CDFW). Work within CDFW jurisdiction normally requires a Streambed Alteration Agreement. 7.0 LIMITATIONS The results of this delineation are preliminary. Regulatory agencies, including the USACE, SWRCB, and CDFW, make the final determination about the location and extent of wetlands and other waters on the study area, and this delineation report should be sent to the USACE for verification. This report does not constitute authorization to conduct the Project, and all necessary permits and approvals should be obtained from regulatory agencies prior to Project implementation. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 13 8.0 REFERENCES Baldwin D.H, Goldman D.H., Keil D.J., Patterson R, Rosatti T.J., Wilken D.H. (ed.). 2012. The Jepson Manual Vascular Plants of California: Second Edition. University of California Press, Berkeley. 1568 pps. California Geological Survey. 2010. Geologic map of California. Website at: http://www.conservation.ca.gov/cgs/cgs_history/Pages/2010_geologicmap.aspx. Environmental Laboratory. 1987. U.S. Army Corps of Engineers Wetlands Delineation Manual. Technical report Y 87-1, U.S. Army Corps of Engineers Waterways Experiment Station, Vicksburg, Mississippi. Environmental Protection Agency (EPA). 2008. Clean Water Act jurisdiction following the U.S. Supreme Court’s Decision in Rapanos v. United States & Carabell v. United States. Dated December 2. EPA. 2021. Current implementation of Waters of the United States. Accessed at https://www.epa.gov/wotus/current-implementation-waters-united-states on November 9, 2021. Federal Register. 1994. Changes in hydric soils of the United States. Washington, DC, July 13. Lichvar, R.W., D.L. Banks, W.N. Kirchner, and N.C. Melvin. 2018. The National Wetland Plant List: 2018 wetland ratings. Website at: http://wetland_plants.usace.army.mil/. Munsell Soil Book of Color. 2012. Munsell Soil Color Charts: with Genuine Munsell Color Chips. Grand Rapids, MI: Munsell Color, Revised 2009. Natural Resource Conservation Service (NRCS). 2021a. Web Soil Survey. Website at: http://websoilsurvey.nrcs.usda.gov/app/WebSoilSurvey.aspx. Natural Resource Conservation Service (NRCS). 2021b. Lists of hydric soils. Website at: https://www.nrcs.usda.gov/wps/portal/nrcs/main/soils/use/hydric/. Sawyer J.O., Keeler-Wolf T. 1995. A Manual of California Vegetation. California Native Plant Society, Sacramento, CA. State Water Resources Control Board (SWRCB). 2019. State Wetland Definition and Procedures for Discharges of Dredged or Fill Material to Waters of the State. Adopted April 2, 2019. U.S. Army Corps of Engineers (USACE). 2008. Regional Supplement to the Corps of Engineers Wetland Delineation Manual: Arid West Region (Version 2.0). Wakeley JS, Lichvar RW, Noble CV, editors. ERDC/EL TR-08-28. Vicksburg, MS: U.S. Army Engineer Research and Development Center. U.S. Army Corps of Engineers (USACE). 2020. National Wetland Plant List. Website at: http://wetland- plants.usace.army.mil/nwpl_static/v34/home/home.html. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project June 2022 14 U.S. Geological Survey (USGS). 2021. National hydrography dataset. Website at: https://nhd.usgs.gov/. U.S. Fish and Wildlife Service (USFWS). 2020. National Wetlands Inventory. Website at: http://www.fws.gov/wetlands. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project March 2022 A-1 Appendix A Wetland Delineation Data Forms DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project March 2022 B-1 Appendix B Draft Aquatic Resources Delineation Map DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project March 2022 C-1 Appendix C Project Site Representative Photographs DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Appendix C. Study Area Photographs Photograph 1: View of culvert that conveys East Branch Green Valley Creek beneath Diablo Road. Photograph 2: View of eucalyptus grove along southern shoulder of Diablo Road (northern bank of East Branch Green Valley Creek) in western section of study area. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 3: View of oak woodlands above grazed non-native annual grassland in central section of study area. Photograph 4: View of natural swale where vertical precipitation runs off hillslope above central portion of study area. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 5: Sample Point 1. Photograph 6: Sample point 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 7: Sample Point 3. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 8: Sample Point 4. Photograph 9: Sample Point 7. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 10: Sample Point 8. Photograph 11: Sample Point 9. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 12: Sample Point 10. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Photograph 13: Sample Point 11. Photograph 14: Sample Point 12. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Aquatic Resources Delineation Report Diablo Road Trail Project March 2022 D-1 Appendix D Plant Species Observed on the Diablo Road Trail Project Site DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Scientific Name Common Name Family Indicator Status Aesculus californica California buckeye Sapindaceae - Avena barbata slender oat Poaceae - Avena fatua wild oat Poaceae UPL Brassica nigra black mustard Brassicaceae - Bromus diandrus ripgut brome Poaceae - Bromus hordeaceus soft chess Poaceae FACU Carduus pycnocephalus Italian thistle Asteraceae - Carex spp. sedges Cyperaceae FAC Cirsium vulgare bull thistle Asteraceae FACU Erodium botrys cranesbill Geraniaceae FACU Erodium cicutarium redstem filaree Geraniaceae - Eucalyptus globulus blue gum Myrtaceae - Festuca perennis Italian ryegrass Poaceae FAC Geranium dissectum cutleaf geranium Geraniaceae - Geranium molle dove’s-foot geranium Geraniaceae - Hirschfeldia incana shortpod mustard Brassicacrae - Hordeum murinum mousetail barley Poaceae FAC Hypochaeris radicata rough cat’s-ears Asteraceae FACU Juncus balticus Baltic rush Juncaceae FACW Juncus effusus bog rush Juncaceae FACW Lepidium nitidum shining pepperweed Brassicaceae FAC Lysimachia arvensis scarlet pimpernel Myrsinaceae FAC Medicago polymorpha California burclover Fabaceae FACU Quercus agrifolia coast live oak Fagaceae - Quercus lobata valley oak Fagaceae FACU Rumex crispus curly dock Polygonaceae FAC Salix laevigata red willow Salicaceae FACW Salix lasiolepis arroyo willow Salicaceae FACW Trifolium spp. clover Fabaceae FAC Typha spp. cattails Typhaceae OBL Umbellularia californica California bay laurel Lauraceae FAC DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 B-1 Appendix B USFWS Information for Planning and Consultation System Report DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 May 25, 2021 United States Department of the Interior FISH AND WILDLIFE SERVICE Sacramento Fish And Wildlife Office Federal Building 2800 Cottage Way, Room W-2605 Sacramento, CA 95825-1846 Phone: (916) 414-6600 Fax: (916) 414-6713 In Reply Refer To: Consultation Code: 08ESMF00-2021-SLI-1902 Event Code: 08ESMF00-2021-E-05510 Project Name: Diablo Road Trail Project Subject:List of threatened and endangered species that may occur in your proposed project location or may be affected by your proposed project To Whom It May Concern: The enclosed species list identifies threatened, endangered, proposed and candidate species, as well as proposed and final designated critical habitat, under the jurisdiction of the U.S. Fish and Wildlife Service (Service) that may occur within the boundary of your proposed project and/or may be affected by your proposed project. The species list fulfills the requirements of the Service under section 7(c) of the Endangered Species Act (Act) of 1973, as amended (16 U.S.C. 1531 et seq.). Please follow the link below to see if your proposed project has the potential to affect other species or their habitats under the jurisdiction of the National Marine Fisheries Service: http://www.nwr.noaa.gov/protected_species/species_list/species_lists.html New information based on updated surveys, changes in the abundance and distribution of species, changed habitat conditions, or other factors could change this list. Please feel free to contact us if you need more current information or assistance regarding the potential impacts to federally proposed, listed, and candidate species and federally designated and proposed critical habitat. Please note that under 50 CFR 402.12(e) of the regulations implementing section 7 of the Act, the accuracy of this species list should be verified after 90 days. This verification can be completed formally or informally as desired. The Service recommends that verification be completed by visiting the ECOS-IPaC website at regular intervals during project planning and implementation for updates to species lists and information. An updated list may be requested through the ECOS-IPaC system by completing the same process used to receive the enclosed list. The purpose of the Act is to provide a means whereby threatened and endangered species and the ecosystems upon which they depend may be conserved. Under sections 7(a)(1) and 7(a)(2) of the Act and its implementing regulations (50 CFR 402 et seq.), Federal agencies are required to DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 05/25/2021 Event Code: 08ESMF00-2021-E-05510 2 ▪ utilize their authorities to carry out programs for the conservation of threatened and endangered species and to determine whether projects may affect threatened and endangered species and/or designated critical habitat. A Biological Assessment is required for construction projects (or other undertakings having similar physical impacts) that are major Federal actions significantly affecting the quality of the human environment as defined in the National Environmental Policy Act (42 U.S.C. 4332(2) (c)). For projects other than major construction activities, the Service suggests that a biological evaluation similar to a Biological Assessment be prepared to determine whether the project may affect listed or proposed species and/or designated or proposed critical habitat. Recommended contents of a Biological Assessment are described at 50 CFR 402.12. If a Federal agency determines, based on the Biological Assessment or biological evaluation, that listed species and/or designated critical habitat may be affected by the proposed project, the agency is required to consult with the Service pursuant to 50 CFR 402. In addition, the Service recommends that candidate species, proposed species and proposed critical habitat be addressed within the consultation. More information on the regulations and procedures for section 7 consultation, including the role of permit or license applicants, can be found in the "Endangered Species Consultation Handbook" at: http://www.fws.gov/endangered/esa-library/pdf/TOC-GLOS.PDF Please be aware that bald and golden eagles are protected under the Bald and Golden Eagle Protection Act (16 U.S.C. 668 et seq.), and projects affecting these species may require development of an eagle conservation plan (http://www.fws.gov/windenergy/eagle_guidance.html). Additionally, wind energy projects should follow the wind energy guidelines (http://www.fws.gov/windenergy/) for minimizing impacts to migratory birds and bats. Guidance for minimizing impacts to migratory birds for projects including communications towers (e.g., cellular, digital television, radio, and emergency broadcast) can be found at: http://www.fws.gov/migratorybirds/CurrentBirdIssues/Hazards/towers/towers.htm; http://www.towerkill.com; and http:// www.fws.gov/migratorybirds/CurrentBirdIssues/Hazards/towers/comtow.html. We appreciate your concern for threatened and endangered species. The Service encourages Federal agencies to include conservation of threatened and endangered species into their project planning to further the purposes of the Act. Please include the Consultation Tracking Number in the header of this letter with any request for consultation or correspondence about your project that you submit to our office. Attachment(s): Official Species List DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 05/25/2021 Event Code: 08ESMF00-2021-E-05510 1 Official Species List This list is provided pursuant to Section 7 of the Endangered Species Act, and fulfills the requirement for Federal agencies to "request of the Secretary of the Interior information whether any species which is listed or proposed to be listed may be present in the area of a proposed action". This species list is provided by: Sacramento Fish And Wildlife Office Federal Building 2800 Cottage Way, Room W-2605 Sacramento, CA 95825-1846 (916) 414-6600 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 05/25/2021 Event Code: 08ESMF00-2021-E-05510 2 Project Summary Consultation Code:08ESMF00-2021-SLI-1902 Event Code:08ESMF00-2021-E-05510 Project Name:Diablo Road Trail Project Project Type:RECREATION CONSTRUCTION / MAINTENANCE Project Description:The proposed project is located along Diablo Road in Danville, Contra Costa County, California. The overall proposed project consists of a 8 to 10-foot wide off-street paved multi-use trail. This trail will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/ Mt. Diablo Park south access to the east. The project site is located along Green Valley creek and Diablo Road, to the south is Magee cattle ranch property and to the north is a residential area. Green Valley creek has an elevation of 361 feet. Vegetative habitats in the surrounding area are characterized as a mixed riparian woodland, non-native annual grassland, ruderal, oak woodland, and residential. The mixed riparian woodland, non-native annual grassland, oak woodland, and ruderal habitats are located on the Magee cattle ranch property and therefore regularly grazed. Project Location: Approximate location of the project can be viewed in Google Maps: https:// www.google.com/maps/@37.835218350000005,-121.9673984695616,14z Counties:Contra Costa County, California DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 05/25/2021 Event Code: 08ESMF00-2021-E-05510 3 1. Endangered Species Act Species There is a total of 8 threatened, endangered, or candidate species on this species list. Species on this list should be considered in an effects analysis for your project and could include species that exist in another geographic area. For example, certain fish may appear on the species list because a project could affect downstream species. IPaC does not display listed species or critical habitats under the sole jurisdiction of NOAA Fisheries , as USFWS does not have the authority to speak on behalf of NOAA and the Department of Commerce. See the "Critical habitats" section below for those critical habitats that lie wholly or partially within your project area under this office's jurisdiction. Please contact the designated FWS office if you have questions. NOAA Fisheries, also known as the National Marine Fisheries Service (NMFS), is an office of the National Oceanic and Atmospheric Administration within the Department of Commerce. Mammals NAME STATUS San Joaquin Kit Fox Vulpes macrotis mutica No critical habitat has been designated for this species. Species profile: https://ecos.fws.gov/ecp/species/2873 Endangered Birds NAME STATUS California Least Tern Sterna antillarum browni No critical habitat has been designated for this species. Species profile: https://ecos.fws.gov/ecp/species/8104 Endangered Reptiles NAME STATUS Alameda Whipsnake (=striped Racer) Masticophis lateralis euryxanthus There is final critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/5524 Threatened 1 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 05/25/2021 Event Code: 08ESMF00-2021-E-05510 4 Amphibians NAME STATUS California Red-legged Frog Rana draytonii There is final critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/2891 Threatened California Tiger Salamander Ambystoma californiense Population: U.S.A. (Central CA DPS) There is final critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/2076 Threatened Fishes NAME STATUS Delta Smelt Hypomesus transpacificus There is final critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/321 Threatened Insects NAME STATUS San Bruno Elfin Butterfly Callophrys mossii bayensis There is proposed critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/3394 Endangered Crustaceans NAME STATUS Vernal Pool Fairy Shrimp Branchinecta lynchi There is final critical habitat for this species. The location of the critical habitat is not available. Species profile: https://ecos.fws.gov/ecp/species/498 Threatened Critical habitats THERE ARE NO CRITICAL HABITATS WITHIN YOUR PROJECT AREA UNDER THIS OFFICE'S JURISDICTION. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Sequoia Ecological Consulting, Inc. Biological Resources Report Diablo Road Trail Project June 2022 C-1 Appendix C NMFS Online Species List Query Report DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Quad Name Diablo Quad Number 37121-G8 ESA Anadromous Fish SONCC Coho ESU (T) - CCC Coho ESU (E) - CC Chinook Salmon ESU (T) - CVSR Chinook Salmon ESU (T) - SRWR Chinook Salmon ESU (E) - NC Steelhead DPS (T) - CCC Steelhead DPS (T) - X SCCC Steelhead DPS (T) - SC Steelhead DPS (E) - CCV Steelhead DPS (T) - X Eulachon (T) - sDPS Green Sturgeon (T) - ESA Anadromous Fish Critical Habitat SONCC Coho Critical Habitat - CCC Coho Critical Habitat - CC Chinook Salmon Critical Habitat - CVSR Chinook Salmon Critical Habitat - SRWR Chinook Salmon Critical Habitat - NC Steelhead Critical Habitat - CCC Steelhead Critical Habitat - SCCC Steelhead Critical Habitat - SC Steelhead Critical Habitat - CCV Steelhead Critical Habitat - Eulachon Critical Habitat - sDPS Green Sturgeon Critical Habitat - ESA Marine Invertebrates Range Black Abalone (E) - Range White Abalone (E) - ESA Marine Invertebrates Critical Habitat DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Black Abalone Critical Habitat - ESA Sea Turtles East Pacific Green Sea Turtle (T) - Olive Ridley Sea Turtle (T/E) - Leatherback Sea Turtle (E) - North Pacific Loggerhead Sea Turtle (E) - ESA Whales Blue Whale (E) - Fin Whale (E) - Humpback Whale (E) - Southern Resident Killer Whale (E) - North Pacific Right Whale (E) - Sei Whale (E) - Sperm Whale (E) - ESA Pinnipeds Guadalupe Fur Seal (T) - Steller Sea Lion Critical Habitat - Essential Fish Habitat Coho EFH - X Chinook Salmon EFH - X Groundfish EFH - Coastal Pelagics EFH - Highly Migratory Species EFH - MMPA Species (See list at left) ESA and MMPA Cetaceans/Pinnipeds See list at left and consult the NMFS Long Beach office 562-980-4000 MMPA Cetaceans - MMPA Pinnipeds - DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 April 7, 2022 4080 Cabrilho Drive · Martinez, CA 94553 · Telephone (925) 930-7901 · Fax (925) 723-2442 Re: Tree Inventory & Preliminary Recommendations for Diablo Trail Project, Danville Note: This is not a comprehensive arborist report – it encompasses the tree and inventory and preliminary recommendations for client review. The report will be completed once input is received. #s: Each tree was given a number ranging from #101-147. Their locations are given in the tree protection plan. Some trees were not surveyed, so I approximately located them on the plan. DBH (Diameter at Breast Height): Trunk diameters in inches were measured at 4.5’ above average grade with a diameter tape. Height of measurement may deviate from the standard on atypical trunks; deviations are noted under the “Comments” section. Health & Structural Condition Rating Dead: Dead or declining past chance of recovery. Poor (P): Stunted or declining canopy, poor foliar color, possible disease, or insect issues. Severe structural defects that may or may not be correctable. Usually not a reliable specimen for preservation. Fair (F): Fair to moderate vigor. Minor structural defects that can be corrected. More susceptible to construction impacts than a tree in good condition. Good (G): Good vigor and color, with no obvious problems or defects. Generally more resilient to impacts. Very Good (VG): Exceptional specimen with excellent vigor and structure. Unusually nice. Dripline: Canopy radius was visually estimated in each cardinal direction. Age Young (Y): Within the first 20% of expected life span. High resiliency to encroachment. Mature (M): Between 20% - 80% of expected life span. Moderate resiliency to encroachment. Overmature (OM): In >80% of expected life span. Low resiliency to encroachment. # Species DBH Health Structure Dripline N E S W Age Comments Preliminary Recommendations 101 Valley Oak (Quercus lobata) 35 F/F-P F 25 5 35 20 M-OM Root crown slightly buried. Codominant stems at 8' with wide attachment. Large scaffold limb removed at 5', has wound wood. Significant dieback up to 4" in diameter, especially on S side of canopy. Pruned for high voltage wire clearance. DBH measured at 3.5'. 2' from proposed trail. To reduce impact, shift trail further from trunk; no native soil compaction & limit excavation within 40' of trunk. Tree may still decline. 102 Coast Live Oak (Quercus agrifolia) 10 G-F F 15 5 5 10 Y Root crown slightly buried. Codominant stems at 15', narrow union, possible included bark. Epicormic growth on S side of trunk. Very minor twig dieback. Sparse canopy. 3' from proposed trail. To reduce impact, shift trail further from trunk; no native soil compaction & limit excavation within 10' of trunk. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Tree Inventory & Preliminary Recommendations, Diablo Trail Project April 7, 2022 Maija Wigoda-Mikkila, Certified Arborist 2 # Species DBH Health Structure Dripline N E S W Age Comments Preliminary Recommendations 103 Valley Oak 21 F/F-P F/F-P 35 15 30 10 M Buried root crown. Vehicle wound on NW side of trunk. 4' × 2.5'; reaction wood. Codominant stems at 7' with wide union. Stunted shoot growth. Moderate dieback up to 2" in diameter. Pruned for high voltage wire clearance. 2' from proposed trail. To reduce impact, shift trail further from trunk; no native soil compaction & limit excavation within 25' of trunk. 104 Coast Live Oak 15 G/G-F F/F-P 25 10 0 25 Y-M Codominant stems with included bark at 5'; 2" bulge on SE side of union. Large wound on stem growing over road; ~60% of wood removed by vehicle. Minor twig dieback and slightly sparse canopy. In proposed trail. Remove 105 Valley Oak 12 G F/F-P 25 SW Y Understory tree. Phototropic growth to SW. Dense buds and foliage. DBH estimated. 9' from proposed trail. To reduce impact, shift trail as close to road as feasible. 106 Valley Oak 30 G/G-F F 50 NW M At edge of top of bank. Phototropic growth to NW. Dense foliage. Very minor twig dieback. DBH estimated. Tree not tagged. 6' from proposed trail. To reduce impact, shift trail as close to road as feasible; no native soil compaction & limit excavation within 30' of trunk. 107 Valley Oak 16 G/G-F F 30 SW M Understory tree. Dense foliage. Doglegs at 25'. DBH estimated. Tree not tagged. 5' from proposed trail. To reduce impact, shift trail as close to road as feasible; no native soil compaction & limit excavation within 15' of trunk. 108 Coast Live Oak 28 G F 25 NW 15 E 25 S M Root crown buried. Codominant stems at 8' with bulging beneath, likely included bark. Dense canopy, good vigor. 4' from proposed trail. To reduce impact, shift trail as close to road as feasible; no native soil compaction & limit excavation within 25' of trunk. 109 Valley Oak 40 F F 40 NE 25 45 40 M Tridominant stems at 7' with wide unions. Grass growing in union. Heading cuts for high voltage wire clearance. Epicormic growth on N scaffold branches. Stunted shoots but dense foliage. DBH estimated. Tree not tagged. In proposed trail. Remove 110 Valley Oak 36 F/F-P G-F/F 10 20 50 15 M Trunk on edge of creek bank. Moderate dieback up to 4" in diameter. Epicormic growth on SE secondary scaffold. DBH estimated. Tree not tagged. 16' from proposed trail. No native soil compaction & limit excavation within 40' of trunk (preferably beneath trail as well). Tree may still decline. 111 Valley Oak 22 F/F-P G-F 25 20 25 15 M Trunk on edge of creek bank. Exterior deadwood up to 8" in diameter. Epicormic growth on stem & scaffold branches. DBH estimated. Tree not tagged. 13' from proposed trail. No native soil compaction & limit excavation within 25' of trunk (preferably beneath trail as well). Tree may still decline. 112 Coast Live Oak 15 G G-F 15 25 15 15 Y-M Very dense canopy, dark green leaf color. Codominant stems at 5' with wide union. In proposed trail. Remove 113 Coast Live Oak 16 G F 20 40 10 15 Y-M Root crown slightly buried uphill. Phototropic growth to E. Dense canopy; vigorous new growth. DBH estimated. In proposed trail. Remove 114 Valley Oak 40 F G-F 10 25 25 20 M Dead 12" stem 7' from grade. Trunk on edge of bank. Dieback up to 1"-2" in diameter. Otherwise, dense foliage. DBH estimated. Tree not tagged. 12' from proposed trail. No native soil compaction & limit excavation within 40' of trunk (preferably beneath trail as well). Tree may still decline. 115 Coast Live Oak 11 G F 20 NE Y Dense foliage, good vigor. Phototropic growth to NE, has corrected. DBH estimated. Tree not tagged. 6' from proposed trail. Install protection fencing, arborist on-site during excavation. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Tree Inventory & Preliminary Recommendations, Diablo Trail Project April 7, 2022 Maija Wigoda-Mikkila, Certified Arborist 3 # Species DBH Health Structure Dripline N E S W Age Comments Preliminary Recommendations 116 Coast Live Oak 13 G/G-F G-F/F 15 10 15 15 Y Root crown slightly buried. Dense canopy. Nice central leader. Topped for high voltage wire clearance. 2' from proposed trail. To reduce impact, shift trail further from trunk; no native soil compaction & limit excavation within 15' of trunk. 117 Valley Oak 19 F/F-P F 10 20 30 25 M Wire embedded in trunk. New wire wrapped around trunk. Abrupt decrease in trunk diameter above wires. Moderate twig dieback and epicormic growth on scaffold branches. Stunted shoot growth in prior years. Pruned back for high voltage clearance. 3' from proposed trail. To reduce impact, shift trail further from trunk; no native soil compaction & limit excavation within 25' of trunk. 118 Valley Oak 24 F G-F 25 20 0 20 M Root crown slightly buried. Wire embedded on S side of trunk. Twig dieback up to 1" in diameter. Less than 1' from proposed trail. Remove 119 Valley Oak 36 F G-F 50 25 30 35 M Moderate dieback up to 1"-2" in diameter. Stunted shoot growth. Epicormic growth on scaffold branches. Dense foliage on new shoots. 11' from proposed trail. To reduce impact, shift trail as close to road as possible; no native soil compaction & limit excavation within 35' of trunk. 120 Coast Live Oak 18 G G-F 25 10 20 25 M Codominant stems at 7' with wide union. Very dense canopy. Good vigor. In proposed trail. Remove 121 Coast Live Oak 36 G G-F 15 35 40 30 M Central leader with wide branch unions. Dense canopy. 14' from proposed trail. To reduce impact, shift trail as close to road as possible; no native soil compaction & limit excavation within 30' of trunk. 122 Coast Live Oak 30 G/G-F G-F 40 30 25 25 M Edge of creek. Roots exposed. 6" branch failure on W side of trunk. Very minor tip dieback. 1' from proposed trail. Remove 123 Valley Oak 42 G-F F 25 20 30 30 M Minor dieback. Dense buds just leafing out. Codominant stems at 15' with wide union. Wire embedded in trunk. In proposed trail. Remove 124 Coast Live Oak 20 G G-F 15 20 20 10 M Nice central leader. Dense canopy. Crack at base on W side of stem. DBH estimated. Tree not tagged. In proposed trail. Remove 125 Valley Oak 25 G-F G-F/F 40 NE M Phototropic growth over street. Minor tip dieback. Epicormic growth on scaffold branches. Dense foliage. Wire embedded on S side of trunk. In proposed trail. Remove 126 Blue Gum (Eucalyptus globulus) 66 F/F-P F/F-P 25 15 30 35 M Trunk on edge of creek bank. Sparse canopy with dieback up to 1" in diameter. Large & overextended watersprouts on scaffold branches. Broken branches up to 8" in diameter. DBH estimated. In proposed trail. Remove 127 Coast Live Oak 14 G/G-F F 30 SW Y-M Phototropic growth to SW. Trunk on edge of creek bank. Upright branching from primary scaffold limb. Broken branches up to 4" in diameter, possibly from failed eucalyptus limbs above. DBH estimated. Tree not tagged. 5' from proposed trail. To reduce impact, no native soil compaction & limit excavation within 10' of trunk. 128 Blue Gum 40 F-P F 10 10 25 15 M Sparse canopy. Dieback up to 1" in diameter. Very upright growth. Few scaffolds. First major scaffold at 40'. DBH estimated. Tree not tagged. 1' from proposed trail. Remove 129 Blue Gum 58 F-P F 35 10 15 15 M Elongated branches with past failures over street. Old wire beginning to girdle trunk. Sparse canopy. Watersprouts on Remove DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Tree Inventory & Preliminary Recommendations, Diablo Trail Project April 7, 2022 Maija Wigoda-Mikkila, Certified Arborist 4 # Species DBH Health Structure Dripline N E S W Age Comments Preliminary Recommendations scaffold branches. Marginal trunk taper. DBH estimated. In proposed trail. 130 Blue Gum 60 F F/F-P 25 20 20 10 M Broken branches up to 6". Sparse canopy and watersprouts on trunk and scaffolds. Marginal trunk taper. In proposed trail. Remove. 131 Valley Oak 26 G-F F 5 30 SE 20 SW M Trunk at edge of creek bank. Minor twig dieback. Phototropic growth to S. Broken branches up to 4" in diameter, possibly from failed eucalyptus limbs. Marginal trunk taper. DBH estimated. Tree not tagged. 10' from proposed trail. To reduce impact, shift trail as close to road as possible; no native soil compaction & limit excavation within 25' of trunk. 132 Blue Gum 57 F/F-P F-P 15 20 20 10 M Sparse canopy. Marginal trunk taper. Watersprouts on trunk and scaffold branches. Broken branches up to 12" in diameter. 1' from proposed trail. Remove 133 Blue Gum 37 F P 0 30 NE 15 5 M Sparse canopy, epicormic growth. Old 14" failure at 40' over street. Stem over-extended over street. Minor tip dieback. Marginal trunk taper. Codominant stems at 50'. Less than 1' from proposed trail. Remove 134 Blue Gum 62 G-F F 40 NE 30 15 M Slightly sparse canopy. Fewer epicormic sprouts than other eucs, but still has moderate watersprouts on scaffold branches. Overextended limbs over street. Better health than other eucalyptus. In proposed trail. Remove 135 Blue Gum 40 F F/F-P 15 15 30 10 M Sparse canopy. Epicormic growth along trunk & scaffold branches. Secondary stem with tight union at 15'. Minor dieback up to 1" in diameter. Marginal trunk taper. In proposed trail. Remove 136 Blue Gum 40 F-P VP 20 10 10 5 M Large limb failures - 14" on S side of canopy, 8" on N side. Top appears to have broken off at 40'. Significant watersprout growth throughout canopy. Roots exposed on S side of trunk. Trunk at edge of creek bank. Marginal trunk taper. In proposed trail. Remove 137 Blue Gum 62 F F/F-P 25 30 25 15 M Fruiting bodies on E side of trunk. Barbed wire embedded in center of trunk. Canopy denser than other eucs. Branch failures up to 12" in diameter. Trunk at edge of creek bank. Minor tip dieback. Marginal trunk taper. In proposed trail. Remove 138 Coast Live Oak 24 F/F-P P 20 25 10 0 M Old stem failure on W side of trunk. Significant decay, hollow trunk. 10" dead branch on W side of canopy. Significant sycamore borer at base on SW side of trunk. Somewhat sparse canopy. Fair vigor. In proposed trail. Remove 139 Coast Live Oak 10 G G-F 0 10 5 20 Y Dense canopy & good vigor. Phototropic growth to W. Roots exposed. DBH estimated. Tree not tagged. 11' from proposed trail. Install protection fencing. 140 Valley Oak 20 F F 0 15 15 15 M Phototropic bow to W; has corrected. Moderate twig dieback. Dead 5" branch on exterior S side of canopy. Moderate epicromic growth on stem & scaffold branches. 10" failure on E side of stem, 5' from grade. Good vigor. DBH estimated above first scaffold branch. Tree not tagged. 18' from proposed trail. Install protection fencing. 141 Valley Oak 15.5 G/G-F G-F 15 15 10 25 Y-M Root crown slightly buried. 6" branch failure on NE side of canopy. Minor tip dieback. In proposed trail. Remove. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Tree Inventory & Preliminary Recommendations, Diablo Trail Project April 7, 2022 Maija Wigoda-Mikkila, Certified Arborist 5 # Species DBH Health Structure Dripline N E S W Age Comments Preliminary Recommendations 142 Coast Live Oak 12 VG F 5 10 20 25 Y Very dense canopy, dark green color, good vigor. Codominant stems at 8'; union not visible. Photototropic growth to W; understory tree. DBH estimated. Tree not tagged. 20' from proposed trail. Install protection fencing. 143 Valley Oak 14 G/G-F F 0 0 10 25 Y-M Poor trunk taper. Minor tip die back. 11' from proposed trail. Install protection fencing. 144 Valley Oak 14 G/G-F G-F/F 15 15 20 20 Y-M Poor trunk taper. Codominant stems at 30'. Appears to be wide union. Minor tip dieback. 8' from proposed trail. Install protection fencing. 145 Coast Live Oak 12 G F-P 10 all Y Dense canopy. At edge of existing bridge. Topped for high voltage wire clearance. Not surveyed. Trunk location & DBH estimated. In proposed trail. Remove 146 Coast Live Oak 12 G P 25 SW Y Dense canopy. Root ball appears to have lifted out of soil, may have stabilized; 30 degree lean to S. No target. Not surveyed. Trunk location & DBH estimated. In proposed trail. Remove 147 Valley Oak 14 F P-VP 5 all Y-M Topped for high voltage wire clearance. Codominant stems. Failed leader. Canopy comprised of watersprouts. Engulfed by poison oak. Not surveyed. Trunk location & DBH estimated. Tree not tagged. 2' from proposed trail, likely in continuation of trail. Remove DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Draft IS/MND September 2022 Appendix C Archaeological Survey Report (Confidential) DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Bay Area Division Phone: 510.524.3991 900 Modoc Street Fax: 510.524.4419 Berkeley, CA 94707 www.pacificlegacy.com Pacific Basin 30 Aulike St. #301 Kailua, HI 96734 808.263.4800 Ph. 808.263.4300 Fax Sierra/Central Valley 4919 Windplay Dr. #4 El Dorado Hills, CA 95762 916.358.5156 Ph. 916.358.5161 Fax March 8, 2022 Marcy Kamerath, QSD/P. CPSWQ Kimley-Horn and Associates, Inc. 1300 Clay Street, Suite 325 Oakland, CA 94612 Re: Phase I Archaeological Survey Letter Report for the Diablo Road Trail Project, Danville, Contra Costa County, California. Dear Ms. Kamerath: This letter report details the results of an archaeological survey conducted by Pacific Legacy, Inc. for the Diablo Road Trail Project (Project). The survey was completed under contract with Kimerley-Horn and Associates, Inc. (Kimerley-Horn) on behalf of the Town of Danville. The project is approximately 0.9 miles adjacent to Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 400 feet west of the intersection of Avenue Nueva and Diablo Road in the Town of Danville, Contra Costa County, California (see Attachment A, Figure 1). Pacific Legacy was retained by Kimerley-Horn in order to review previous cultural resources and studies within the Project and surrounding areas, coordinate contact with the Native American Heritage Commission (NAHC), and conduct an intensive pedestrian survey in order to comply with the California Environmental Quality Act (CEQA). Project Description The Project is envisioned as a 0.9-mile, mostly Class I, mixed-use path for pedestrians and cyclists along the southern shoulder of Diablo Road that will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would include a pedestrian and bicycle roadway crossing at the intersection of Diablo Road in the vicinity of Fairway Drive. The crossing would connect to the existing Diablo Road Trail Class I bicycle/pedestrian path that lies parallel to Diablo Road on the north side of the roadway. Other elements of the Project would include the construction of an 8-foot-wide off-street paved multi-use path with 2-foot shoulders for a total width of 12 feet in most locations, narrowing to a lesser width in constrained locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Associated infrastructure would include guard rails, fencing, and retaining walls, where needed, and the installation of new culverts or culvert extensions along the trail to provide drainage. Vegetation and tree removal would be required to construct the trail and would include the removal of native trees and non-native trees. Access to the construction site would occur from Diablo Road and adjacent roads. While final staging areas would be decided by the contractor, staging would primarily occur within the proposed trail alignment. Completion of the proposed project would include emergency repairs required to protect Diablo Road in place as a result of erosion. The Project would stabilize slope and improve erosion protection. The Project would also provide bicyclists a safer alternative to DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 2 Diablo Road and would help close a multi-purpose trail gap between the existing Diablo Road Trail (aka Barbara Haile Trail) and access to Mount Diablo State Park. The Project Area of Potential Impact (API) encompasses all Project work areas and staging areas. Project Location The 1.05-acre API is located along Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in the Town of Danville, Contra Costa County, California. It is located immediately north of the east branch of Green Valley Creek on property belonging to the Magee Cattle Ranch. The API is depicted on the United States Geological Survey (USGS) 7.5-minute series Diablo, California topographic quadrangle within Township 1 South, Range 1 West, Section 22 (see Attachment A, Figure 1). The API is depicted on a true-color orthophotograph in Attachment A, Figure 2. Archival and Records Search An archival and records search was conducted within a 0.25-mile buffer area around the Project API by staff at the Northwest Information Center (NWIC) of the California Historical Resources Information System (CHRIS) at Sonoma State University (see Attachment B). The search was conducted on December 20, 2021, under NWIC file number 21-0856. This search included a review of: • Office of Historic Preservation Built Environment Resources Directory (California Office of Historic Preservation 2022); • The California Inventory of Historic Resources (State of California 1976); • Archaeological Determinations of Eligibility; • California Historical Landmarks (California Office of Historic Preservation 1996); • Caltrans Historic Bridge Inventory (Caltrans 2015); • California Points of Historical Interest listing May 1992 (State of California 1992); and • The National Register of Historic Places (Directory of Determinations of Eligibility, California Office of Historic Preservation, Volumes I and II, 1990; Office of Historic Preservation Computer Listing 1990 and updates). The archival and records search revealed that no cultural resources have been previously recorded within the API or the 0.25-mile records search buffer. Two prior cultural resources studies encompassed portions of the APE and no additional studies were identified within the 0.25-mile buffer. Details for both studies are presented in Table 1. Table 1. Prior Cultural Resource Studies Associated with the Project Area. Study Number Title Author Year Type S-038908 Magee Ranch, Archaeological Survey and Subsurface Testing Report, Contra Costa County, California Wilberg, Randy S. 2011 Archaeological, Excavation, Field Study DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 3 Study Number Title Author Year Type Cultural Resources Study of the Magee Ranch Property, Danville, Contra Costa County, California (letter report) Holman, Miley Paul 2009 Archaeological, Excavation, Field Study Cultural Resources Assessment Report, Magee Ranch Project, Town of Danville, Contra Costa County, California Bulger, Teresa D., Thomas Young, and Nazih Fino 2015 Archaeological, Field Study COE_2014_1209_001, Section 106 Consultation for the Summerhill Homes in Danville, Contra Costa County, California (COE #2011-00044S) Polcano, Julianne and Jane M. Hicks 2016 OHP Correspondence S-048919 Cultural Resources Inventory for the Diablo Country Club Recycled Water Project, Contra Costa County, California Sikes, Nancy E., Cindy J. Arrington, and Dylan Stapleton 2016 Archaeological, Field Study Historical Resources Evaluation Report For The Diablo Country Club Recycled Water Project, Diablo, Contra Costa County, California Daly, Pamela 2016 Architectural/historical, Evaluation, Field Study S-038908 involved archaeological excavation and survey of the Magee Ranch Property, which is bounded on the north by Diablo Road. Archaeological survey was conducted within the Diablo Road Trail API, but excavation activities took place elsewhere. No archaeological resources were identified during this study. S-048919 partially overlaps a small portion of the western end of the Diablo Road Trail API. The study involved archaeological survey and a historic-built environment survey and evaluation. Two historic period resources associated with the Diablo Country Club Golf Course, P-07-004768 and P-07-004769 were identified. Neither resource is within 0.25 miles of the Diablo Road Trail API. The 2011 report contains a comprehensive background section relevant to the Diablo Road Trail project (Wiberg 2011). This includes a project context addressing the natural environment, regional archaeology, Native American background, and historic land use. The report also suggests that the area is of moderate-to-high geoarchaeological sensitivity. Subsurface excavation (Wiberg 2011) of test trenches further to the south of the Diablo Trail project did not result in the discovery of buried archaeological resources (Wiberg 2011). We have included this report and the preceding report for the same project (Holman 2009) in Attachment B. Both reports were negative for archaeological resources within the Diablo Road Trail API. Native American Contact Pacific Legacy personnel submitted a request to the NAHC for a search of the Sacred Lands File as it encompasses the Project API on November 30, 2021 (see Attachment C). A follow-up email was sent on January 26, 2022. To date, no response has been received from the NAHC. In order to initiate AB 52 consultation, a list of interested Native American stakeholders for Contra Costa County was used that dated to February 24, 2021. This NAHC list was used in lieu of an up-to- DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 4 date list. When a response is received from the NAHC, the contact lists will be compared, and newly added contacts will be sent requests for consultation. The following persons were identified as potentially having knowledge of the API based on the 2019 list: Ms. Irenne Zwierlein, Chairperson of the Amah Mutsun Tribal Band of Mission San Juan Bautista; Mr. Lloyd Mathiesen, Chairperson of the Chicken Ranch Rancheria of Me-Wuk Indians; Mr. Donald Duncan, Chairperson of the Guidiville Indian Rancheria; Ms. Kanyon Sayers-Roods, MLD contact for the Indian Canyon Mutsun Band of Costanoan; Ms. Ann Marie Sayers, Chairperson of the Indian Canyon Mutsun Band of Costanoan; Ms. Monica Arellano, Chairperson of the Muwekma Ohlone Indian Tribe of the SF Bay Area; Mr. Cosme Valdez, Chairperson of the Nashville Enterprise Miwok-Maidu-Nishinam Tribe; Ms. Katherine Erolinda Perez, Chairperson of the North Valley Yokuts Tribe; Timothy Perez of the North Valley Yokuts Tribe; Mr. Andrew Galvan of The Ohlone Indian Tribe; Mr. Jesus Tarango, Chairperson of the Wilton Rancheria; Mr. Steven Hutchason, THPO of the Wilton Rancheria; Mr. Dahlton Brown, Director of Administration for the Wilton Rancheria; and Ms. Corrina Gould, Chairperson of The Confederated Villages of Lisjan. A certified letter was sent to each individual on January 8, 2022, from the Town of Danville requesting any information they might have regarding the Project API and if they wished to participate in AB 52 consultation. The Wilton Rancheria indicated that they have no concern regarding the Project on January 27, 2022. A follow-up email was sent by the Town of Danville to each of the stakeholders on February 4, 2022. No replies have been received to date. Any responses from potential Native American stakeholders regarding the Project will be forwarded upon receipt. Archaeological Survey Pacific Legacy archaeologist Elena Reese, M.A., conducted an intensive pedestrian survey of the Project API on January 18, 2022. The goal of the survey was to identify any Native American or historic period cultural resources visible on the ground surface within the API and document them. Terrain within the API consisted of an east-west ridge that paralleled Diablo Road and the Project API to the south. The east branch of Green Valley Creek meandered along the base of the hillside at the western end of the trail alignment and flowed into a corrugated metal pipe culvert at the Alameda Diablo intersection. The culvert went under Diablo Road and the creek proceeded northeast out of the API. A ranch road is present approximately parallel to and upslope of Diablo Road in the western portion of the API. The survey was conducted walking 10-meter spaced transects within the API and 15-meter transects within a 30-meter buffer on either side of the API, bounded to the north by Diablo Road. A total of 14.81 acres were subject to survey, including the 1.05-acre API. Much of the Project survey corridor was composed of steeply sloped hillsides with 40-degree or more angled slopes. The slopes were inspected for potential Native American milling bedrock outcrops and signs of excavation or changes to the natural slope that might indicate historic period use, where feasible. Surface soils were inspected for the presence of darkened soils, shell, and cultural artifacts, which could be interpreted as evidence of human occupation and for the presence of historic period artifacts and features. Steep slopes above the trail alignment and the DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 5 steep-sloped creek banks were not formally surveyed. Survey coverage is depicted in Attachment A, Figure 3. Ground surface visibility in the survey area ranged from 30-70% along parts of the creek edges and along portions of the ranch road to 0% visibility along the north side of the creek where surface visibility was obscured by thick tree debris and duff. Vegetation observed included eucalyptus trees and oak trees, possible Tree of Heaven seedlings along the creek, and seasonal grasses and forbes. Soils along the length of the survey corridor were dense clays with little gravel that varied slightly in color from gray to dark gray. The eastern segment of the survey corridor has been the subject of some subsurface disturbance. There were five PG&E utility vaults, a utility access hole, and several culverts noted between the ranch road and Diablo Road along the trail alignment. The far east end of the trail alignment was highly disturbed. A section was graded flat next to Diablo Road, slopes had erosion waddles in rows, a new construction gate was installed near the original ranch gate, and the construction area was surrounded by black fabric environmental fencing. In addition, there were concrete pipe segments staged for a large utility line to be installed. No evidence of any Native American cultural resources was identified during the survey. No historic period artifacts or archaeological deposits were identified. Two ranch-related built- environment resources, a water trough and walls, were observed. These were both located at the west end of the trail alignment near where Fairway Drive intersects Diablo Road and are noted on the Project construction plans. The feature closest to the Trail alignment is a cylindrical concrete water trough resting on a seven-sided concrete foundation. The trough is 9 feet in diameter and the walls were 27 inches tall by 6 inches wide. The trough was full of water and appears to be actively in use. The trough is located at UTM 0590627 mE/4188077 mN. Aerial photographs hosted on NETROnline suggest the trough was present in the late 1950s, which would fall within the historic period (NETROnline 2022). It is located 5 feet to the south of the API. The second built-environment resource is located across the creek from the trough and the trail alignment, approximately 20 feet to the south of the API. The feature consists of fragmentary board-molded concrete retaining wall or bridge abutment segments along a bend in the creek. Several sections have broken and fallen into the creek. Photographs of the survey and built-environment features are included in Appendix D. Discussion of Results and Recommendations Archival and records searches revealed that two cultural resource studies had been previously conducted within the Project area, all of which incorporated field study and/or subsurface excavation. Both of the studies produced negative results for archaeological resources. No cultural resources have been previously recorded within 0.25 miles of the API. The results of the sacred lands file search are still pending. Letters were sent to Native American stakeholders to notify them about the Project and provide them an opportunity to address any concerns they may have. To date a single response has been received. The Wilton Rancheria indicated that they have no concern regarding the Project. A pedestrian archaeological survey of the APE and a 30-meter buffer bounded to the north by Diablo Road did not result in the identification of any Native American or historic period cultural materials. Two built-environment features, a DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 6 concrete cattle water trough and a concrete retaining wall were observed during the survey and photographed. Ground disturbing activities have the potential to reveal buried archaeological deposits not visible during surface inspection in any portion of the Project API. Prior to initiating ground disturbing activities associated with the API, construction personnel should be alerted to the possibility of encountering buried prehistoric or historic period cultural material. Personnel should be advised that, upon discovery of buried archaeological deposits, work in the immediate vicinity of the find should cease and a qualified archaeologist should be contacted immediately if one is not already present. Once the find has been identified, plans for the treatment, evaluation, and mitigation of impacts to the find will need to be developed if it is found to be eligible for inclusion in the California Register of Historical Resources. Potential cultural materials include Native American and historic period artifacts and remains. These may consist of, but are not limited to: • Historic period artifacts, such as glass bottles and fragments, tin cans, nails, ceramic and pottery sherds, and other metal objects; • Historic period features such as privies, wells, cellars, foundations, or other structural remains (bricks, concrete, or other building materials); • Native American flaked-stone artifacts and debitage, consisting of obsidian, basalt, and/or chert; • Groundstone artifacts, such as mortars, pestles, and grinding slabs; • Dark, almost black, soil with a “greasy” texture that may be associated with charcoal, ash, bone, shell, flaked stone, groundstone, and fire-affected rock; and, • Human remains. If human remains are encountered during construction, work in that area must cease and the Contra Costa County Coroner must be notified immediately. If the remains are determined to be Native American, the NAHC must be notified within 48 hours as required by Public Resources Code 5097. The NAHC will notify the designated Most Likely Descendant, who will in turn provide recommendations for the treatment of the remains within 24 hours. Should you have any questions regarding this report, please contact Pacific Legacy Principal Investigator John Holson, MA, at 510.524.3991, ext. 1. Sincerely, Christopher Peske, Cultural Resources Specialist Pacific Legacy, Inc. Attachments: Attachment A – Project Figures Attachment B – Records Search Documentation DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 7 Attachment C – Native American Communications Attachment D – Photographic Documentation DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Diablo Road Trail Project Contra Costa County, California February 2022 8 References Cited National Environmental Title Research, LLC (NETRonline) 2022 1959 Aerial Photograph of Diablo Road area. Accessed January 2022. Available at https://www.historicaerials.com; search Diablo Road, Danville, CA. Holman, Miley P. 2009 Cultural Resources Study of the Magee Ranch Property, Danville, Contra Costa County, California (letter report). Report S-038908 on file with the Northwest Information Center of the California Historical Resources Inventory, Sonoma State University. Wiberg, Randy 2011 Magee Ranch, Archaeological Survey and Subsurface Testing Report, Contra Costa County, California. Report S-038908 on file with the Northwest Information Center of the California Historical Resources Inventory, Sonoma State University. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 ATTACHMENT A – PROJECT FIGURES DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 AlamedaCounty ContraCosta County SacramentoCounty SolanoCounty 0 1 Miles 0 1 Kilometers Project Area of Potential Impact (API)¯ 1:24,000 DiabloQuadrangle Figure 1. Location and Vicinity Map for the Diablo Road Trail Project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 S-038908 S-048919 0 1 Miles 0 1 Kilometers Records Search Area Project Area of Potential Impact (API) Previous Study Coverage ¯ 1:24,000 Figure 2. Previous Study Coverage Map for the Diablo Road Trail Project. DiabloQuadrangle DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 R o v i g o C t M i l a n o C t B o r m i o C t Canad a V i a Cl y d e s d a l e D r la Cadena Merano St Av e N u e v a Fa i r w a y D r Cll Ar r o y o Alameda Diabl o Diab l o R d Water Trough Retaining Wall 0 800 Feet 0 200 Meters Area of Potential Impact (API) Built-Environment Feature Survey Coverage¯ 1:4,000 Figure 3. Survey Results for the Diablo Road Trail Project. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 ATTACHMENT B – RECORDS SEARCH DOCUMENTATION DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 California Historical Resources Information System CHRIS Data Request Form 1 of 3 ACCESS AND USE AGREEMENT NO.:________________ IC FILE NO.:______________________ Information Center Use Only DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 California Historical Resources Information System CHRIS Data Request Form 2 of 3 NOTE: All digital data products are subject to availability check with the appropriate Information Center. 1. Map Type Desired: Regardless of what is requested . There is an additional charge for shapefiles, whether they are provided with or without Custom GIS Maps. Mark one map choice only Custom GIS Maps Shapefiles Custom GIS Maps and Shapefiles Hard Copy Hand Drawn Maps only Any selection below left unmarked will be considered a "no. " 2a. ARCHAEOLOGICAL Resource Locations+ NON-ARCHAEOLOGICAL Resource Locations Report Locations+ Resource Database Printout* (list) Resource Database Printout* (detail) Resource Digital Database Records (spreadsheet)+ Report Database Printout* (list) Report Database Printout* (detail) Report Digital Database Records (spreadsheet)+ ARCHAEOLOGICAL Resource Record copies+* NON-ARCHAEOLOGICAL Resource Record copies* Report copies+*: OHP Historic Properties Directory** OHP Archaeological Determinations of Eligibility+ California Inventory of Historical Resources (1976): In order to receive archaeological information, requestor must meet qualifications as specified in Section III of the current version of the California Historical Resources Information System Information Center Rules of Operation Manual and be identified as an Authorized User under an active CHRIS Access and Use Agreement DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 California Historical Resources Information System CHRIS Data Request Form 3 of 3 2b. Caltrans Bridge Survey Ethnographic Information Historical Literature Historical Maps Local Inventories GLO and/or Rancho Plat Maps Shipwreck Inventory Soil Survey Maps DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 12/20/2021 NWIC File No.: 21-0856 Christopher Peske Pacific Legacy, Inc. 900 Modoc Street Berkeley, CA 94707 Re: 3930.01 Diablo Road Trail The Northwest Information Center received your record search request for the project area referenced above, located on the Diablo USGS 7.5’ quad(s). The following reflects the results of the records search for the project area and a ¼ mile radius: Resources within project area: None Resources within ¼ mile radius: None Reports within project area: S-038908; S-048919 Reports within ¼ mile radius: None Resource Database Printout (list): ☐ enclosed ☒ not requested ☐ nothing listed Resource Database Printout (details): ☐ enclosed ☐ not requested ☒ nothing listed Resource Digital Database Records: ☐ enclosed ☐ not requested ☒ nothing listed Report Database Printout (list): ☐ enclosed ☒ not requested ☐ nothing listed Report Database Printout (details): ☒ enclosed ☐ not requested ☐ nothing listed Report Digital Database Records: ☒ enclosed ☐ not requested ☐ nothing listed Resource Record Copies: ☐ enclosed ☐ not requested ☒ nothing listed Report Copies: ☐ enclosed ☒ not requested ☐ nothing listed OHP Built Environment Resources Directory: ☐ enclosed ☐ not requested ☒ nothing listed Archaeological Determinations of Eligibility: ☐ enclosed ☐ not requested ☒ nothing listed CA Inventory of Historic Resources (1976): ☐ enclosed ☐ not requested ☒ nothing listed Caltrans Bridge Survey: ☐ enclosed ☒ not requested ☐ nothing listed Ethnographic Information: ☐ enclosed ☒ not requested ☐ nothing listed Historical Literature: ☐ enclosed ☒ not requested ☐ nothing listed Historical Maps: ☐ enclosed ☒ not requested ☐ nothing listed Local Inventories: ☐ enclosed ☐ not requested ☒ nothing listed GLO and/or Rancho Plat Maps: ☐ enclosed ☒ not requested ☐ nothing listed DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Shipwreck Inventory: ☐ enclosed ☒ not requested ☐ nothing listed Soil Survey Maps: ☐ enclosed ☒ not requested ☐ nothing listed Please forward a copy of any resulting reports from this project to the office as soon as possible. Due to the sensitive nature of archaeological site location data, we ask that you do not include resource location maps and resource location descriptions in your report if the report is for public distribution. If you have any questions regarding the results presented herein, please contact the office at the phone number listed above. The provision of CHRIS Data via this records search response does not in any way constitute public disclosure of records otherwise exempt from disclosure under the California Public Records Act or any other law, including, but not limited to, records related to archeological site information maintained by or on behalf of, or in the possession of, the State of California, Department of Parks and Recreation, State Historic Preservation Officer, Office of Historic Preservation, or the State Historical Resources Commission. Due to processing delays and other factors, not all of the historical resource reports and resource records that have been submitted to the Office of Historic Preservation are available via this records search. Additional information may be available through the federal, state, and local agencies that produced or paid for historical resource management work in the search area. Additionally, Native American tribes have historical resource information not in the CHRIS Inventory, and you should contact the California Native American Heritage Commission for information on local/regional tribal contacts. Should you require any additional information for the above referenced project, reference the record search number listed above when making inquiries. Requests made after initial invoicing will result in the preparation of a separate invoice. Thank you for using the California Historical Resources Information System (CHRIS). Sincerely, Justin Murazzo Researcher DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Report Detail: S-038908 21-0856 :: 3930.01 Diablo Road Trail Citation information Year:2011 (Jul) Title:Magee Ranch, Archaeological Survey and Subsurface Testing Report, Contra Costa County, California Affliliation:Holman & Associates No. pages: Collections:No Disclosure:Not for publication Author(s):Randy S. Wiberg Attributes:Archaeological, Excavation, Field study Inventory size:c 410 ac No. maps: Identifiers Report No.:S-038908 Other IDs: Cross-refs: Year:2009 (Dec) Title:Cultural Resources Study of the Magee Ranch Property, Danville, Contra Costa County, California (letter report) Affiliation:Holman and Associates No. pages: Inventory size: Collections:No Disclosure:Unrestricted Author(s):Miley Paul Holman Report type(s):Archaeological, Excavation, Field study Sub-desig.:a PDF Pages:42-51 Year:2015 (Apr) Title:Cultural Resources Assessment Report, Magee Ranch Project, Town of Danville, Contra Costa County, California Affiliation:WSA No. pages: Inventory size: Collections:No Disclosure:Not for publication Author(s):Teresa D. Bulger, Thomas Young, and Nazih Fino Report type(s):Archaeological, Field study Sub-desig.:b PDF Pages:52-134 Type Name Submitter WSA Project No 2013-100 Submitter WSA Report No. 2015-14 OTIS Report Number COE_2014_1209_001 Agency Nbr File Number 2011-00044S Page 1 of 3 NWIC 12/20/2021 1:50:37 PM DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Report Detail: S-038908 21-0856 :: 3930.01 Diablo Road Trail Database record metadata Entered:6/11/2012 blacke Last modified:7/10/2019 vickeryn IC actions: Associated resources General notes Date User Address: Record status:Verified Location information County(ies):Contra Costa USGS quad(s):Diablo Has informals:No No. resources:0 PLSS: Date User Action taken 7/10/2019 vickeryn Added additional citations 'a' 'b' and 'c'. Year:2016 (Jan) Title:COE_2014_1209_001, Section 106 Consultation for the Summerhill Homes in Danville, Contra Costa County, California (COE #2011-00044S) Affiliation:Office of Historic Preservation, U.S. Army Corps of Engineers No. pages: Inventory size: Collections:No Disclosure:Unrestricted Author(s):Julianne Polanco and Jane M. Hicks Report type(s):OHP Correspondence Sub-desig.:c PDF Pages:135-144 T1S R1W Sec. 21, 22, 23, 27 MDBM Page 2 of 3 NWIC 12/20/2021 1:50:37 PM DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Report Detail: S-048919 21-0856 :: 3930.01 Diablo Road Trail Citation information Year:2016 (Oct) Title:Cultural Resources Inventory for the Diablo Country Club Recycled Water Project, Contra Costa County, California Affliliation:Natural Investigations Company No. pages: Database record metadata Entered:5/31/2017 vickeryn Last modified:1/17/2018 neala IC actions: Associated resources General notes Date User Address: Collections:No Disclosure:Not for publication Record status:Verified Location information Author(s):Nancy E. Sikes, Cindy J. Arrington, and Dylan Stapleton Attributes:Archaeological, Field study County(ies):Contra Costa USGS quad(s):Diablo Inventory size: No. maps: Identifiers Report No.:S-048919 Other IDs: Cross-refs: Has informals:No No. resources:2 PLSS: Date User Action taken 5/31/2017 vickeryn Unprocessed resources 5/31/2017 vickeryn Partial printed copy 12/21/2017 Thibaulte processed resources Primary No.Trinomial Name P-07-004768 Diablo Country Club Property Dis P-07-004769 Diablo Country Club Golf Course Year:2016 (Oct) Title:Historical Resources Evaluation Report For The Diablo Country Club Recycled Water Project, Diablo, Contra Costa County, California Affiliation:Daly & Associates No. pages: Inventory size: Collections:No Disclosure:Not for publication Author(s):Pamela Daly Report type(s):Architectural/historical, Evaluation, Field study Sub-desig.:a PDF Pages:52-102 Page 3 of 3 NWIC 12/20/2021 1:50:38 PM DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MAGEE RANCH ARCHAEOLOGICAL SURVEY AND SUBSURFACE TESTING REPORT CONTRA COSTA COUNTY CALIFORNIA Prepared for: Wendi Baker SummerHill Homes 5000 Executive Parkway, Suite 150 San Ramon, CA 94583 Prepared by: Randy S. Wiberg, M.A., RPA Holman & Associates 3615 Folsom Street San Francisco, CA 94110 July 2011 S-038908 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 SUMMARY OF FINDINGS Holman & Associates, on behalf of SummerHill Homes, completed a pedestrian survey and subsurface mechanical testing for archaeological resources at the MaGee Ranch in the Town of Danville, Contra Costa County, California. This work was done in support of the proposed MaGee Ranch Subdivision 9291. The nature of the proposed undertaking requires compliance with the California Environmental Quality Act (CEQA; Public Resources Code, Section 21000 et seq., revised 2005) and Section 106 of the National Historic Preservation Act of 1966 (36 CFR 800, revised 2004), which mandate federal and California public agencies consider the effects of an undertaking on cultural resources. The archaeological Area of Potential Effects (APE) for the Project includes 119 acres of proposed residential development and another 291 acres of land designated permanent open space. A records search for the project in August 2009 revealed that the APE had never been surveyed for cultural resources and that no archaeological sites were recorded within or immediately adjacent to the property. The pedestrian survey and subsurface testing were completed between 2009 and 2011. The surface survey yielded negative findings for evidence of prehistoric or historic archaeological resources. Thirteen backhoe trenches were subsequently excavated within portions of the proposed construction envelope (Lot 3) to depths averaging approximately 3.0 meters (10 feet) below surface, to gain a representative sample of the subsurface deposits. No subsurface cultural materials were identified in the 13 trenches. No further studies are recommended for the project APE, which appears to have a low sensitivity to contain intact and/or buried archeological deposits. If archaeological material is encountered during construction in the project APE, all work should stop in the area until a qualified archaeologist can evaluate the nature and significance of the find. Additional investigations could also may be required if the project changes substantially to include areas not investigated during this study. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 2 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TABLE OF CONTENTS SUMMARY OF FINDINGS ……………………………………………………………… 2 INTRODUCTION ………………………………………………………………………… 4 PROJECT LOCATION AND DESCRIPTION …………………………………………… 4 PROJECT CONTEXT …………………………………………………………………….. 5 Natural Environment ………………………………………………………………. 5 Prehistoric Background ……………………………………………………………. 8 Ethnographic Background …………………………………………………………. 13 Historic Background ………………………………………………………………. 15 RESEARCH METHODS …………………………………………………………………. 16 Records Search and Literature Review ……………………………………………. 16 Records and Archival Search Findings ……………………………………………. 17 Pedestrian Survey ………………………………………………………………….. 23 Subsurface Testing ………………………………………………………………… 23 DISCUSSION AND RECOMMENDATIONS ………………………………………….. 24 REFERENCES CITED ……………………………………………………………………. 29 APPENDICES A: Trench Descriptions LIST OF FIGURES Figure 1. Project Vicinity ………………………………………………………………….. 6 Figure 2. Project Location ………………………………………………………………… 7 Figure 3. Regional Geology ……………………………………………………………….. 9 Figure 4. Project Area Soils ……………………………………………………………….. 10 Figure 5. Historic Era Setting ……………………………………………………………… 21 Figure 6. 2009 Google Earth Image …………………………………………...................... 22 Figure 7. Test Trench Locations …………………………………………………………… 25 Figure 8. Selected Views of Project Area …………………………………………………. 26 Figure 9. Selected Views of Exploratory Trenches and MaGee Ranch …………………… 27 LIST OF TABLES Table 1. Historic Maps and Census Timeline for Project Area ……………………………. 19 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 3 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 INTRODUCTION Holman & Associates (H&A), on behalf of SummerHill Homes, completed archaeological studies in support of the proposed Magee Ranch Subdivision 9291 in the Town of Danville, Contra Costa County, California (Figure 1). Fieldwork consisted of a pedestrian survey of the approximately 410-acre ranch property and subsurface mechanical testing within the proposed construction envelope (Lot 3) bordering the East Branch of Green Valley Creek. The nature of proposed construction activities and the need to acquire a federal permit require compliance with (1) the California Environmental Quality Act (Public Resources Code, Section 21000 et seq., revised January 2005); and (2) Section 106 of the National Historic Preservation Act of 1966 (36 CFR 800, revised 1999), which require federal and California public agencies to consider the effects of undertakings on historic properties, including archaeological resources buried or obscured by natural landscape evolution processes or the built environment. PROJECT LOCATION AND DESCRIPTION The Project Area of Potential Effects (APE) is an approximately 410 acre property in the Town of Danville, Contra Costa County, encompassing portions of the northeast ¼ of Section 21, the northwest, northeast and southeast ¼ of Section 22, the southwest ¼ of Section 23, and northeast ¼ of Section 27, Township 1 South, Range 1 West, Mount Diablo Base and Meridian. The study area is located on the U.S. Geological Survey (USGS) 1980 Diablo 7.5” topographic quadrangle, a portion of which is reproduced as Figure 2. The property is situated south of Diablo Road and Blackhawk Road, and north of Tassajara Road which runs through Sycamore Valley. Mount Diablo State Park is located approximately one mile northeast of the Project Area. The existing Magee Ranch is part of a historically larger ranch that was subdivided in the 1980s. Portions of the historic ranch north and east of the study area have already been developed. Currently, the property is used for cattle ranching activities. Existing ranch improvements are located at the end of San Andreas Drive, and include a hay barn and stable buildings. There is also an equestrian riding area west of the ranch buildings opposite the end of Creekledge Court. The project includes an application to subdivide the 410-acre site into 85 single-family lots; 75 lots would range in size from approximately 10,000 square feet to 22,000 square feet. The remaining ten lots would be developed as custom homes with lots ranging in size from approximately 218,000 square feet to 750,000 square feet. The project proposes to locate the subdivision on approximately 119 acres on the flatter portions of the site, avoiding steeper slopes and ridgelines. The remaining approximately 291 acres would remain as undeveloped open space. In order to accommodate the proposed project, the site would need to be rezoned to allow the proposed clustered development. The proposed project would rezone portions of the project site that are currently zoned A-4 (Agricultural Preserve District) and A-2 (General Agricultural District) to P-1 (Planned Unit Development District); a portion of the site currently zoned P-1 would also be zoned to the new P-1 district. The project would entail the construction of a roadway from Diablo Road/Blackhawk Road adjacent to Jillian Way, which would serve as the primary entrance to the subdivision; access to the proposed custom home sites would be provided by separate project driveways located near Diablo Road/Clydesdale Drive and south of MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 4 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 the intersection of Diablo Road/McCaully Road. The proposed project would also include an eight-foot decomposed granite trail adjacent to Green Valley Creek. The proposed project would require the construction and installation of infrastructure, including water supply, natural gas and electric, sanitary sewer, and stormwater detention facilities among others. Sanitary sewer services would be provided by the Central Contra Costa Sanitary District. East Bay Municipal Utility District would be responsible for providing water supply, and PG&E would be responsible for natural gas and electric services. The project would also install three bioretention facilities; the proposed custom home-sites would have individual on-site stormwater treatment facilities. PROJECT CONTEXT Natural Environment Topography, soils, and vegetation in the project vicinity comprise an environment favorable to prehistoric and historic human habitation. Information about these characteristics is presented to provide context for discussion of prehistoric and historic occupation of the project vicinity. The Magee Ranch property is located at the headwaters of the San Ramon Creek watershed, at the southeastern periphery of the East Branch of Green Valley Creek. San Ramon Creek is part of the Walnut Creek watershed that flows through the cities of Walnut Creek and Concord before emptying into Suisun Bay. Topographically, the study area can be divided into two areas: upper Green Valley and the surrounding hills, ridges, and ravines. The study area ranges in elevation from approximately 420 ft. (128 m) above mean sea level (msl) at the northwest corner of the property—near the intersection of Diablo and McCauley Roads—to 961 ft. (293 m) on a ridge top peak in the southeast corner of the study area. The property consists of rangelands and horse corrals. Habitats on the site include riparian woodland, valley oak savannah, and non-native grassland. Within the project vicinity, one of the most prominent vegetation types is the non-native grassland community, which encompasses the west- facing slopes. The study area lies within the Coast Ranges geomorphic province, a fold-and-thrust belt characterized by nearly parallel northwest-trending ridges, interspersed with alluvium-filled valleys. The geology of the study area vicinity is to a large extent controlled by major active faults. The San Andreas Fault zone forms the boundary between the Pacific and North American crustal plates and locally separates two bedrock complexes that underlie the region: the Franciscan Formation and the Salinian Block. Contra Costa County lies east of the San Andreas Fault and is underlain by the Franciscan Formation. The Franciscan Formation is an assemblage of sedimentary, volcanic, and metamorphic rocks that formed when the Pacific crustal plate thrust beneath the North American plate during the Jurassic and Cretaceous Age, 65 to 200 million years ago. These sea floor sediments form most of the Coast Ranges and rocks of the Franciscan Formation are exposed widely over much of the Bay Area, including in the Diablo Range (Graymer et al. 1994). MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 5 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Fi g u r e 1 . P r o j e c t V i c i n i t y . MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 6 July 2011 Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 Figure 2. Project Location (source: USGS 7.5’ Diablo topographic quadrangle [National Geographic TOPO, 2007]). MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 7 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 8 July 2011 Different bedrock formations within the vicinity of the study area are defined by fault boundaries. According to Graymer et al. (1994), bedrock underlying the uplands areas consists of Pliocene non-marine sedimentary rock of the Tassajara-Green Valley Formation (Tgvt); referred to as the Orinda Formation (Tor) by Dibblee (2005) (Figure 3). Bedrock of the Orinda Formation typically consists of weakly indurated sandstone, siltstone and claystone with thin beds of pebble conglomerate. Crane (1995) maps Sherburne Tuff, a volcanic ash deposit within the Green Valley Formation, running through the northern portions of Lot 3. Most local valleys, including upper Green Valley, are relatively small and tucked in troughs between ridgelines. Soils deposited by stream flow and sheet wash have accumulated adjacent to Green Valley Creek. As described in a geotechnical study for the Magee Ranch project, the alluvial material consists of stiff to very stiff, interbedded, silty to sandy clays with relatively thin lenses of medium dense to dense clayey sand to depths ranging from 22 feet to greater than 50 feet (ENGEO 2010). Several soil types occur within the project vicinity (Figure 4). South of upper Green Valley, where the valley floor transitions to moderately steep uplands, is a mix of Alo Clay (AaF) and Diablo Clay (DdF). These soils, which are underlain by soft sandstone and shale, are well drained with slopes ranging from 30 to 50 percent (USDA 1977). They have high to moderate erosion potential and can vary from shallow (from 20 inches) to moderately deep (about 48 inches). The alluvial deposits bordering the East Branch of Green Valley Creek are Cropley Clay (CkB) and Botella Clay Loam (BaA). Botella and Cropley soils are hydric―saturated, flooded, or ponded long enough during the growing season to develop anaerobic conditions in the upper part―found on alluvial fans and flood plains in small upland valleys. These are moderately well drained, very deep soils (up to about 60-68 inches) formed in fine-textured alluvium from sedimentary rock. Due to these factors, these depositional soils have some potential to contain archaeological deposits and features. In a representative profile, the surface layer (to about 24 inches) is dark gray clay which is underlain by about 10 inches of dark gray to dark brown calcareous clay. The substratum is dark grayish-brown to dark brown calcareous clay extending to about 44 inches. Below this is yellowish-brown to pale brown calcareous clay that extends to a depth of more than 60 inches. Prehistoric Background Archaeological research in central California began in the late nineteenth century at the University of California, Berkeley. Later, guided by Alfred Kroeber, scientific investigation and excavation of San Francisco Bay area shellmounds began. N.C. Nelson described and mapped over 400 major Bay Area mounds, some of which had already been leveled or destroyed, but many were still large and obvious when the survey was completed in 1908 (Nelson 1909). Uhle had excavated the Emeryville Shellmound (ALA-309) in 1902, where he noted that deeper earlier deposits contained different artifact assemblages, different burial modes, and differing percentages of faunal remains than did shallower later deposits, thus indicating cultural change through time (Uhle 1907). Nelson later reported on excavations at CCO-295 (Nelson 1910) and Loud (1924) reported on CCO-298 and CCO-300, all located along the eastern Bayshore. Kroeber (1925) summarized their data and so did Schenck (1926), adding new data from DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Fi g u r e 3 . R e g i o n a l G e o l o g y ( s o u r c e : ) . LE G E N D Qa A L L U V I U M To r O R I N D A F O R M A T I O N Tn N E R O L Y F O R M A T I O N So u r c e : G e o l o g i c M a p o f D i a b l o Q u a d r a n g l e ( D i b b l e e 2 0 0 6 ) MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 9 July 2011 Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 10 July 2011 Figure 4. Project Area Soils. LEGEND AaF ALO CLAY (30 to 50% slopes) AaG ALO CLAY (50 to 75% slopes) BaA BOTELLA CLAY LOAM (0 to 2% slopes) CkB CROPLEY CLAY (2 to 5% slopes) DdF DIABLO CLAY (30 to 50% slopes) Source: USDA Soil Conservation Service DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 additional excavations at Emeryville. Both rejected Uhle's hypothesis, concluding that the mounds showed great homogeneity internally and between sites and demonstrated very little cultural change through time, and were therefore of scant research value. Kroeber's opinion held sway at UCB until after World War II; meanwhile, UC Berkeley focused on archaeological research outside its immediate vicinity. In 1939, following several years of work by Sacramento Junior College, Lillard, Heizer, and Fenenga (LH&F 1939) presented a cultural sequence based on sites in the Lower Sacramento Valley (LSV) and Delta; this came to be known as the Central California Taxonomic System (CCTS). Formulated before the advent of radiocarbon (and later, obsidian hydration) dating, depositional stratigraphy, cultural patterns, and regular changes in artifact assemblages at LSV sites were used as the key time markers. A tripartite chronological system was proposed, with Early, Middle, and Late Horizons (now called Periods). Absolute and additional relative dating techniques in the area of its origin has since confirmed the LSV sequence. LH&F 1939 emphasized use of the "gravelot" as the basic unit of interpretive data, and suggested that the sequence was applicable to other sites outside the study area, but they were rather equivocal about Bay Area sites. Beardsley (a UCB student) applied the CCTS to Bay Area and Marin County sites (Beardsley 1948, 1954), with limited success. The question of how the LSV sequence relates to Bay Area archaeological data is still a major research topic, but it seems clear that the CCTS becomes less powerfully informative with increasing distance from the original sites researched. Gerow presented an alternative view of culture change, sequence, and Bay-Delta relationships through time (Gerow with Force 1968), hypothesizing that in the earliest manifestations the two regions differed significantly both in culture and in human physical types but became more similar later in time (Gerow 1974). One unfortunate legacy of the CCTS is the chronological nomenclature, still in current use because it’s in all the previous literature, with the “Early” period not starting until central California had already been occupied for at least 5000 years. Fredrickson presented another formulation of the central California cultural sequence, with a different explanatory model, based largely on North Coast data but also applicable to East Bay shellmounds, LSV/Delta sites, and some interior Contra Costa County sites (Fredrickson 1973, 1974). He proposed a different organizational scheme, with 12,000 years of California prehistory divided into five “patterns” based on similar technology, economic practices, mortuary patterns, concepts of wealth, and changes in type, amount, and direction of trade; relative chronology was emphasized over assigning patterns to specific time periods. Not being based solely or primarily on time periods, this model eliminated the problem of the “Early Period” not being nearly early enough. Several of these archaeological cultures (Windmiller, Berkeley and Augustine Patterns, and the Meganos Aspect of the Berkeley Pattern) are relevant to the Project Area archaeological record. Windmiller Pattern The Windmiller Pattern (or Early Horizon in the CCTS) is a cultural archetype dating to the Middle Archaic Period and early portions of the Upper Archaic Period, first identified on raised landforms bordering freshwater marshes and the Cosumnes and Mokelumne Rivers in the Central Valley (Heizer 1949; LH&F 1939; Ragir 1972). More recent investigations indicate MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 11 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Windmiller components are more widespread during the Middle Archaic in the San Joaquin Valley, Sierra Nevada, and along the margins of the northern Diablo Range (Rosenthal, White and Sutton 2007; Wiberg 2010). Furthermore, the origins of the Windmiller culture may not rest in the Central Valley heartland as commonly assumed and may date earlier than previously established. The oldest radiocarbon dated extended burials come from CCO-637 in the Los Vaqueros Reservoir area, dated 700 to 800 years older than burials from SJO-68 (Meyer and Rosenthal 1998). Windmiller sites are characterized by unique artifact associations and mortuary treatments. Almost exclusively, burials are extended and oriented in a westward direction. With regards to burial posture, the body is extended ventrally or dorsally with the arms extended at the sides, the hands usually beside or under the pelvis; invariable burial position may have been maintained by tying the legs together at the ankles and in some cases the arms at the wrists (Heizer 1949:13). Common burial associations include thick rectangular and whole Olivella shell beads, rectangular Haliotis beads and ornaments, ground and polished charmstones, slate pins, asbestos splinters, quartz crystals, and red ochre (Heizer 1949:17-24; Moratto 1984:203). Berkeley Pattern While the origins of the Berkeley Pattern appear to date to the Lower Archaic Period, the cultural expression is best known from components throughout central California dating to the Middle and Upper Archaic, from approximately 7000 to 1000 BP. The Berkeley Pattern includes archaeological manifestations previously assigned to the Middle Horizon. Early Berkeley Pattern sites around San Francisco Bay are contemporaneous with the Windmiller sites in the Central Valley, and the Berkeley Pattern eventually replaced the Windmiller Pattern in the Central Valley after 2500 BP. Normative funerary treatment for the Berkeley Pattern includes tightly flexed burials interred without apparent preference for orientation. Cremations are occasionally encountered associated with more grave goods than inhumations, a mortuary differentiation that may signify higher status. In general, Berkeley Pattern graves contain fewer artifacts and grave lots are smaller with more utilitarian objects than Windmiller burials. Olivella saddle and saucer beads and Haliotis pendants and ornaments are the most common shell artifacts recovered with burials. Though elaborate ground stone artifacts are not as common, a highly developed bone industry is sometimes present. Common bone artifacts include needles, pins, tubes and whistles, serrate "saws," and awls. Meganos Aspect of the Berkeley Pattern The disappearance of Windmiller cultural traits in central California was not sudden and complete. Windmiller Pattern components identified in the Stockton area date to around 500 AD (Moratto 1984:210) and sites assigned to a culture known as the Meganos Aspect—a cultural expression combining Windmiller and Berkeley Pattern traits thought to have originated near Stockton that later expanded westward to Concord and southward to San Ramon and Livermore Valleys, Fremont, and northern Santa Clara Valley—postdate Windmiller sites (Bennyhoff 1968, 1994a, 1994b, 1994c). Meganos peoples are known to have established sites (frequently non- MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 12 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 midden cemeteries) on elevated surfaces in the Delta region of the Sacramento Valley-San Joaquin River system. The most characteristic (and to date documented) feature of the Meganos Aspect is the mortuary complex. Most skeletons are found in ventrally extended positions—e.g., all 500 burials at SJO-147 were reportedly ventrally extended (Bennyhoff 1994b:8) and 30 of 35 extended burials at ALA-413 were ventrally extended (Wiberg 1988)—though a shift to mixed dorsal extension and flexed posture is apparent at some Contra Costa County sites (e.g., CCO-139 and CC-141). Despite the predominance of ventrally extended burials, dorsal extension and tight flexure regularly occur, semiflexed and semiextended postures occur less frequently, and cremation is absent. Two other important aspects of the mortuary complex are orientation and funerary offerings. Orientation is characteristically variable, though Bennyhoff reports a northerly trend at western sites. The rarity of grave goods with Meganos burials may be even more extreme than the low frequency typical of the Berkeley Pattern. Augustine Pattern The Augustine Pattern corresponds with the Emergent Period (or Late Horizon) and is divided into Phases 1 and 2. This cultural expression is identified by intrusive traits accompanying the southward movement of Wintuan peoples into the lower Sacramento Valley. Diagnostic artifacts include simple harpoons, collared/flanged smoking pipes, flanged pestles and "show" mortars, incised bone whistles and tubes, Olivella and clam shell beads, Haliotis "banjo" style ornaments, and the bow and arrow—inferred from the small size of projectile points, especially serrate forms (Bennyhoff 1994c; Moratto 1984:211-213, 283). Economically, intensive fishing, hunting, and gathering strategies, particularly harvesting of acorns and other grass seeds, characterize Augustine Pattern components. Flexed burial posture continues to be the normative burial treatment during the Augustine Pattern, with more frequent cremation and preinterment grave burning—where the corpse is set on fire with the flames extinguished (purposely or naturally) before the remains are totally consumed. The Augustine Pattern is characterized by more settlements, larger populations, and evolving exchange systems requiring greater social and political organization, possibly leading to increased status differentiation and social ranking. Furthermore, a rise in population hypothesized for this period may have contributed to social tensions that led to increased incidences of interpersonal violence and the spread of infectious diseases Ethnographic Background The project area is situated within the territory ascribed to the ethnographic Bay Miwok (Bennyhoff, 1977; Kroeber, 1925; Schenk, 1926). The Bay Miwok were one of the five Miwok groups (Coast, Lake, Bay, Plains, and Sierra) who spoke the Miwokan language. Miwokan, together with Costanoan, comprise the Utian Family of languages. Utian, in turn, is one of California's four Penutian languages, the others being Wintuan, Maiduan, and Yokutsan. Unfortunately, ethnographic data on the Bay Miwok are generally scarce, in part due to the early removal of these peoples from their homeland by the Spanish. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 13 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 The Bay Miwok specifically inhabited the area surrounding Mount Diablo northward to Suisun Bay and eastward to the confluence of the Sacramento and San Joaquin rivers. This region is characterized by a myriad of waterways, marshes, and interior uplands. Bennyhoff (1977), using explorers’ accounts, mission records, historical maps, land grant claims, ethnographic sources, and archaeological data identified five East Bay Miwok groups. Subsequently, Milliken (1995) used mission records to identify two additional local tribes—Jalquin and Tatcan. Milliken mapped the relative locations of all seven groups, using historic diaries together with mission register information regarding intermarriage patterns among East Bay local tribes. According to Milliken, the Tatcans controlled San Ramon Creek just west of Mount Diablo. Their central village area may have been at the present town of Danville or Walnut Creek (Milliken 1995:256). The Bay Miwok were hunter-gatherers adapted to varied ecological landscapes. The natural resources of the East Bay provided for nearly all the needs of aboriginal human populations, consequently in some places villages were continuously occupied for thousands of years. Bay Miwok territory encompassed myriad environments: grassland, oak woodland, chaparral, littoral, riparian, estuarine, and marshland environments. While undoubtedly recurrent lack of resources and cultural strife did not make life perpetually easy, in many ways the Indians of central California practiced a lifestyle similar to contemporary agricultural peoples elsewhere. The Bay Miwok had adapted to and managed their abundant local environment so well that some places were continuously occupied for literally thousands of years. The Bay Miwok had perfected living in and managing myriad slightly differing environments, varying with location, some rich enough to allow large permanent villages of "collectors" to exist, others less abundant and better suited to a more mobile "forager" way of life. Littoral (shoreline) and riparian environments were obviously more productive and were therefore most sought out, most intensively utilized and occupied, and most jealously defined and guarded. The archaeological record indicates the transition from the Early to Middle Period is marked by major population migrations and population growth that resulted in social circumscription, which in turn altered access to resources and trade networks and may have increased regional strife. It also probably brought into contact groups with different cultures, religious beliefs, and word views and these differences may have contributed to increased occurrences of interpersonal violence and even warfare. Acorns, a dietary staple through much of central California, were a major source of carbohydrate calories in areas where enough oaks were found. Seeds from grassland species were also important, perhaps more important than acorns in oak-poor areas. Other plant resources included several types of berries, clover, wild onions, and carrots. A wide variety of animals—e.g., mammals, birds, fish, reptiles, shellfish, insects—were hunted, snared, clubbed, trapped, and caught in fish nets and by harpoon. Terrestrial mammal resources included black-tailed deer, elk, antelope, mountain lion, grizzly bear, coyote/dog and a variety of small game animals such as rabbit and squirrel. Quail and waterfowl resources (including geese, ducks, and coots) were also exploited. Steelhead and salmon were an important part of the diet of groups living near larger rivers and marine mammals were exploited by coastal groups. Traditional trade patterns thousands of years old were operating when the Spanish arrived, supplying the Bay Miwok with products from sources sometimes several hundred kilometers MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 14 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 distant and allowing export of products unique to their region. Of particular interest archaeologically is imported obsidian and exported marine mollusk shell beads and ornaments. Obsidian has the useful property of each source having a unique chemical "fingerprint," allowing obsidian artifacts to be sourced to a specific locality of origin, as well as being datable by technical methods (“hydration”). Obsidian was obtained by the Bay Miwok from the North Coast Ranges and Sierran sources, in patterns that changed through time. Shell beads and ornaments, a major export from the Ohlone region, were made primarily from the shells of abalone (Haliotis), Purple Olive snail (Olivella), and Washington clam (Saxidomus), all ocean coast species. Shell beads and ornaments evolved through many different and definable types through the millennia, allowing chronological typing of these common artifacts to serve as a key to the age and relative cultural position of archaeological complexes. These beads were traded for thousands of years, and have been found in prehistoric sites up and down California and many kilometers east into the Great Basin, showing that prehistoric peoples on the coast were tied into an "international" system of trade. At the time of the Spanish invasion, some central Californians had developed a system of exchange currency or "money" based on clam shell disk beads; the extent to which the Bay Miwok related to that system is unknown. Absolute and relative dating of archaeological sites, the linguistic diversity, and demonstrably ancient trade patterns all indicate that the Bay Miwok and other central California groups had reached a state of demographic and social stability unimaginable to modern city-dwellers—a state in which the same family groups occupied the same locations continuously for hundreds or even thousands of years with few if any changes in population size or cultural profile. This long term stability is reflected in the homogeneity of archaeological sites spanning wide geographic and temporal ranges. Yet, the archaeological record also reflects sweeping changes in ecological setting, technological and economic adaptations, replacement of populations by new groups, and amplified social discord. Historic Background Spanish exploration in Contra Costa County dates to the late 1700s. Spanish Mission records indicate local Native Americans were being taken to Mission San Francisco between 1795 and 1806 (Milliken 1995:272). During this period Native American populations declined significantly in response to the introduction and rapid spread of Euro-American diseases. The Mexican revolt against Spain in 1822 and subsequent secularization of the missions in 1834 changed land ownership in California. While the Spanish system was directed at land ownership by the Crown, the Mexican policy stressed individual ownership of land, and following independence from Spain the vast mission lands were granted to private citizens. The last of the mission holdings were relinquished in 1845, making way for the large ranchos common in California in the mid-1800s. The San Ramon Valley contained three large ranchos: San Ramon (Amador); San Ramon (Carpentier); and San Ramon (Norris). The Project Area is within the San Ramon Carpentier rancho. Following the end of the Mexican-American War in 1847 and ratification of the Treaty of Guadalupe in Hidalgo in 1848, California became a United State territory. In 1850 California was formally admitted into the Union, ushering in the American period of history. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 15 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Contra Costa County was one of the original 27 counties created by the California legislature at the time of statehood. The county was originally named Mt. Diablo but later changed to Contra Costa (“opposite coast”) reflecting its geographical relationship to San Francisco. The Gold Rush of 1848 triggered an enormous influx of immigrants to California. This population explosion created a market for a wide range of services and goods, particularly agricultural products. As an increasing number of gold seekers became discouraged with mining, many turned to farming for their livelihood. The population of Contra Costa County also increased rapidly during the Gold Rush. The large ranchos were divided and sold for agricultural uses, with irrigated farming made possible in parts of the County by the development of irrigation canals. Orchards dominated lowland valleys where sufficient water was available, while drier areas were used for dry farming and cattle ranching. Walnuts were a common crop in the central portions of the County, with farmers relying on English walnut branches grafted to American walnut rootstock. During the 1860s and 1870s Antioch and New York of the Pacific (Pittsburg) became important shipping ports, though by the late 1870s Southern Pacific’s “San Pedro and Tulare Railroad” was constructed through the flourishing agricultural region. The end of the Gold Rush corresponds with the beginnings of industrialization in California, a development centered in San Francisco. The discovery of deposits of soft coal in the foothills of Mount Diablo a few miles northwest of the Project Area hastened this industrial development. While the Project Area was on the fringes of the mining district, by the 1860s small towns materialized adjacent to the coal deposits: Nortonville, Somersville, Stewartsville, Judsonville, and West Hartley (Hulaniski 1917). These towns flourished for a couple of decades and then completely disappeared. The 1880 census contains a whole page of Chinese laborers living in Green Valley, possibly employed by farmer John Griffin (U.S. Census Bureau 1880). From the late 1870s to 1912 John Boyd operated the Oakwood Park Stock Farm, a horse and cattle breeding farm. The farm included the Town of Diablo and the southern slopes of Mt Diablo (Tatam 1996:104). The farm was bought by Robert N. Burgess in 1912 and turned into a country club (Tatam 1996:105). In 1949, Harry H. Magee moved his beef cattle operation from Nevada to Danville. The upper Green Valley ranch property, previously used to grow walnuts and raise sheep, encompassed approximately 1200 acres. In the 1950s Harry Magee sold the walnut orchard portion of the property, which was gradually subdivided. This property, between Diablo Road and the East Branch of Green Valley Creek, was developed as part of the Diablo Creek neighborhood. Today, the remaining Magee Ranch property is operated and maintained by Jed Magee, and his family. RESEARCH METODS Records Search and Literature Review Research for this project consisted of pre-field archival research, an on-foot archaeological survey, and focused subsurface mechanical testing. An archival records search for the Project Area was conducted by Miley Holman at the Northwest Information Center (NWIC) of the California Historical Resources Information System (CHRIS) on December 14, 2009, undertaken MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 16 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 to identify prior archaeological studies and known cultural resources within a ½-mile radius of the property. The records search (File No. 09-0752) included a review of the following archives, registers, and lists: ■ Site records for previously recorded sites ■ Reports of previous studies ■ Listing of California Historical Landmarks ■ The National Register of Historic Places (NRHP) ■ The California Register of Historical Resources (CRHR) ■ The California Office of Historic Preservation (OHP) Historic Properties Directory Additional background research was conducted to obtain a general understanding of the history of the MaGee Ranch property. Research was undertaken at the Contra Costa Historical Society and UC Berkeley Map Library. Also property-specific research was conducted online at the Library of Congress American Memory Collection/Maps; Contra Costa County Historical Society’s online list of maps and photographs; David Rumsey historical map collection; Calisphere/OAC collections online; Mount Diablo Interpretive Association; and the Museum of the San Ramon Valley. Various sources, including area histories, newspaper indices, and maps, were used to develop historical context and themes in which historic-era archaeological resources could be evaluated for significance. Records and Archival Search Findings The NWIC records search found no listings for any prehistoric or historic cultural resources within the Project Area, or within ½-mile. The nearest prehistoric sites are recorded near the peak of Mt. Diablo, north of the Project Area. The records search also found no record of any previous cultural resources studies that covered the Project Area. One archaeological pedestrian survey, yielding negative findings for cultural resources, was previously completed east of the Project Area for the Blackhawk Unit 3 development (Banks 1977, In Holman 2009). An expanded search of the NWIC files beyond the ½-mile radius buffer indicated no prehistoric sites have been recorded along the ridge line that passes through the Project Area or during surveys of the larger Blackhawk development north and east of the Project Area. Research does suggest that the general area was utilized by different tribal groups that maintained permanent habitations along San Ramon Creek to the west. In addition to assessing previous prehistoric archaeological studies in the vicinity of the Project Area, standard sources of information that list and identify known and potential historical resources were examined to determine whether any buildings, structures, objects, districts, or sites had been previously recorded or evaluated in or near the Project Area. H&A reviewed the Office of Historic Preservation Determinations of Eligibility for the NRHP, California Inventory of Historic Resources, California Historic Landmarks, and California Points of Historical MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 17 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Interest. None of these registers or lists identified built environment resources in the Project Area. Historic maps and census data were also examined to establish past land ownership and identify potential historic archaeological resources (Table 1). A map prepared in 1871 indicates there were no buildings within the Project Area (Britton & Rey 1871). The map does not show land ownership though another 1871 map indicates the Project Area was part of a 23,989 acre patent granted to the State of California (GLO Land Records 1871). By 1874, portions of the SE ¼ of Section 22 were part of a 127.9 acre grant to John B. Sydnor (GLO Land Records 1874). The 1870 U.S. Census for Township Two lists John B. Sydnor as a 40-year old farmer from Virginia (U.S. Census Bureau 1870). The earliest map showing a structure in the Project Area is the USGS (1896) quadrangle which shows a building in the NE ¼ of Section 27, along the section line between Sections 26 and 27; at the head of a seasonal drainage immediately east of a hairpin curve in a trail that contours the channel (Figure 5). A 1908 map of Contra Costa County indicates that the NE ¼ of Section 27 was owned by the “Simeas Est.” and the SE ¼ of Section 22 was owned by “Boyd” (McMahon 1908). Simeas still owned the NE ¼ of Section 27 in 1914 and 1930 (Arnold 1914, 1930). By 1938, the NE ¼ of Section 27 is owned by “Short” and the SE ¼ of Section 22 is owned by “MR Diablo Co. Ltd”, along with most of the land surrounding the settlement of Diablo (Arnold 1938). A 1939 aerial photograph (USAAA 1939) shows a corral with a northwest-facing entrance in the NE ¼ of Section 27, on the north side of the drainage near a network of cattle paths. A much higher resolution aerial photograph in 1965 shows three small roofed structures next to (west) of the corral (BATSC 1965). By 1953, a building was constructed in the SE ¼ of Section 22 (USGS 1953); by 1960 the property was owned by H & J Co. (Sauer 1960). The 1965 aerial photo (BATSC 1965) shows three roofed buildings at this location, two small utility structures on the hill east of the ravine and a larger building (probably a barn) that corresponds to the location of a structure shown on a later topographic map (USGS 1973). The larger building west of the ravine and road is much larger than the current structure at the same location. A substantial cattle feed station? is present between the creek and the southernmost bend of the access road, immediately north of the barn. By 1972, the NE ¼ of Section 27 was owned by “Plummer” and the SE ¼ of Section 22 was owned by “Magee” (Sauer 1971). Subsequent maps (USGS 1973, 1980) show no changes in the number or locations of buildings within the Project Area. In sum, the earliest building, show on the 1896 USGS map, was located in the SE ¼ of the NE ¼ of Section 27. By 1939, the location contains a corral and by 1965 there are three small structures. A 2009 Google Earth aerial image clearly shows a remnant rectangular foundation footprint and a small oval silhouette (possibly an adjacent corral) next to a modern livestock water and feed station, on the west side of the section line between Sections 26 and 27 (Figure 6). The western portion of the Magee Ranch complex along the East Branch of Green Valley Creek (SE ¼ of Section 22) contained structures by 1953 and by 1965 there were three buildings and a substantial cattle feed station in this area. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 18 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Table 1. Historic Maps and Census Timeline for Project Area. 1871 Topographical Map of Contra Costa County (Britton & Rey 1871) No structures shown in NE ¼ of Section 27 or SE ¼ of Section 22. Nearest buildings are north of Green Valley Creek in Section 22 (Sydnor), south of Sycamore Creek in Section 27 (Chrissman), and a building north of Sycamore Creek and south of the trail in Section 27 (unattributed). GLO Land Records SE ¼ of the NE ¼ of Section 27 was part of a 23,989.79 acre patent granted to the State of California, 11/15/1871 (www.glorecords.blm.gov/CACAAA 000577 1874 GLO Land Records NE ¼ of the SE ¼ of Township 22 granted as part of a 127.90 acre grant to John B. Sydnor, 6/1/1874 (www.glorecords.blm.gov/CACAAA 136843 1896 USGS Mount Diablo 15’ topographic quadrangle Building in NE ¼ of Section 27 just east of hairpin in trail near head of seasonal drainage. Location slightly different on 1953 and 1968 maps; interpreted as same location. No buildings in SE ¼ of Section 22 1904 County of Contra Costa 1904 Assessment List (page 705) Thomas Simeas, (1/3), Maria Simeas (1/3), and M. M. Freitas (1/3); residence in Livermore and property located in Sycamore, NE ¼ of Section 27, 160 Acres, $15/acre, land value $2450, and improvements value $450. 1908 Official Map of Contra Costa County (McMahon 1908) NE ¼ of Section 27 owned by Simeas Estate SE ¼ of Section 22 owned by Boyd; owns other land in the Township 1914 Official Map of Contra Costa County (Arnold & Glass 1914/collection of CCCHS) Ownership of SE ¼ of Section 22 unmarked but adjacent quarter sections owned by Mount Diablo Development Company, McCauley, and Simeas NE ¼ of Section 27 owned by Simeas 1930 Official Map of Contra Costa County (Arnold, 1930) NE ¼ of Section 27 owned by Simens [?]; buildings not displayed on map No ownership listed for SE ¼ of Section 22 1938 Official Map of Contra Costa County (Arnold, 1930) NE ¼ of Section 27 owned by Short; buildings not displayed on map SE ¼ of Section 22 owned by Diablo Co. Ltd, along with land surrounding the settlement at Diablo MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 19 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Table 1. Historic Maps and Census Timeline for Project Area (continued). 1939 U.S. Agricultural Adjustment Administration aerial photos, 1939 (UCB Air Photo 28, BUU-279-109, 7/25/39) NE ¼ of Section 27: difficult to see buildings but probable corral north of drainage and a network of cattle SE ¼ of Section 22: buildings not visible at scale but may be present as there appear to be roads/trails in the vicinity 1953 USGS 1953 Diablo 7.5’ topographic quadrangle Building in NE ¼ of Section 27 just east of head of seasonal drainage and north of trail; trail does not continue around drainage as it does in 1898 USGS map Building in SE ¼ of Section 22 at location of current structure 1960 Official map of Contra Costa County, California (Sauer 1960) No land ownership listed for NE ¼ of Section 27 SE ¼ of Section 22 owned by “H & J Co.” 1965 Bay Area Transportation Study Commission aerial photos (UCB Air Photo 17) NE ¼ of Section 27: aerial photo shows at least three roofed buildings, two appear to be small utility buildings and one possible residential. An open corral with a northwest-facing entrance is east of the buildings. There may be two small structures east of the drainage channel, just west of the section line at the east of the project area. SE ¼ of Section 22: aerial photo shows at least three roofed buildings, one possible small utility building on the hill east of the ravine and two which correspond to locations from the 1973 map. The larger building to the west of the ravine and road is much larger than the current structures on the same location. A corral complex occupies the space between Green Valley Creek and the southernmost curve of the access road. This area appears to currently have some corral remains. Trails and a small water-hole occupy the current location of the large rectangular corral There seems to be a stone wall or fence running N-S along the section line on the eastern boundary of the study area 1968 USGS 1968 Diablo 7.5’ topographic quadrangle Buildings: same two as on 1953 map, with added structure on hill east of ravine in SE ¼ of Section 22 Photorevised 1953 sheet: major differences in project area include two EBMUD reservoirs and access roads, and a trail to current ranch complex from Diablo Road, east of eastern reservoir. 1972 Official Map of Contra Costa County, California (Sauer 1972) NE ¼ of Section 27 owned by Plummer. SE ¼ of Section 22 owned by Magee. 1973 USGS 1973 Diablo 7.5’ topographic quadrangle Buildings same as 1968 map 1980 USGS 1980 Diablo 7.5’ topographic quadrangle Photorevised 1953 sheet: same buildings as 1973 sheet MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 20 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 21 July 2011 Fi g u r e 5 , H i s t o r i c - e r a S e t t i n g ( s ou r c e : 1 8 9 6 U S G S M o u n t D i a b l o 15 ’ t o p o g r a p h i c q u a d r a n g l e ) . Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 22 July 2011 Fi g u r e 6 . 2 0 0 9 G o o g l e E a r t h I m a g e, s h o w i n g p o s s i b l e f o u n d a t i o n fo o t p r i n t o f 1 8 9 6 s t ru c t u r e a n d c o r r a l next to modern li ve s t o c k wa t e r a n d f ee d st a t i o n . Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 Pedestrian Survey In 2009, Miley Holman conducted a preliminary study of the Magee Ranch property, which included the NWIC literature review and field inspection of the potential development envelope adjacent to the East Branch of Green Valley Creek (Holman 2009). No evidence of historic or prehistoric archaeological materials was observed. Remnants of fences and livestock enclosures, and several recent structures were noted but no Ranch buildings or structures potentially eligible for inclusion in the California Register of Historical Resources (CRHR) or National Register of Historic Places (NRHP). The study concluded by recommending further on-foot survey of upland areas that would be left in open space and mechanical subsurface presence/absence testing for buried prehistoric deposits along the edge of the creek. In 2011, Miley Holman and Matthew Clark completed a more systematic pedestrian survey of the upland portions of the Project Area. The survey included inspection of building locations identified during historic archival research to determine if any standing structures or remnants were still present. While the entire Project Area was examined for cultural resources, some areas were not systematically covered due to steep slopes or dense vegetation that obscured the ground surface. While no subsurface sampling was performed an attempt to view the native ground surface was made, including inspection of rodent burrows, cut banks, areas of disturbance, and clearing vegetation in selected areas that appeared sensitive for archaeological sites. The surveyors noted that no bedrock outcrops were exposed on the property that might contain prehistoric milling features or rock art. Except for steeper slopes, the upland portions of the Project Area―primarily the NW-SE trending ridgeline running through the Project Area―was surveyed utilizing 25 to 30 meter transects. On the more gently sloping ridge tops, the most effective manner to survey was to contour the slopes, which was also undertaken using the same spacing interval. Particular attention was paid to the alluvial fans at the mouth of the drainages and the crest of the ridge. Ground visibility within the Project Area ranged from good, in places highly eroded due to cattle grazing, to poor due to ground cover. No prehistoric cultural resources were identified and no buildings or structures were observed at locations where historic maps indicated structures may once have stood. Subsurface Testing Exploratory testing for buried or obscured prehistoric archaeological resources is becoming an important part of the cultural resources identification process in California. The ability to locate sites that do not exhibit surface indications depends on whether or not appropriate methods are used to find them. When subsurface explorations are designed and conducted in an informed fashion, they often help satisfy the requirement that “a reasonable and good faith effort” is made to identify archaeological resources. Subsurface mechanical testing at the Project Area was conducted on May 25, 2011, under the supervision of Randy Wiberg, assisted by Field Technician Kevin Dobinson. The goals of testing were twofold: (1) test for the presence/absence of subsurface prehistoric archaeological resources within the Project Area; and (2) search for archaeologically-sensitive buried land surfaces in MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 23 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 24 July 2011 order to acquire predictive information on the potential for archaeological resources in portions of the project area not tested. Exploratory trenches were excavated at 13 locations along the south bank of the East Branch of Green Valley Creek, the area encompassing the proposed development (Lot 3) envelope. Testing used a tractor mounted backhoe fitted with a 24-inch bucket provided by C&C Excavating, Inc. Each trench was designated according to the numerical order in which it was excavated. The exact location of each trench was determined in the field based on existing conditions, physical constraints1, and the results of ongoing trenching. A handheld Magellan Explorist XL Global Positioning System (GPS) receiver was used to mark the location of trenches and this information was transferred to Project maps (Figure 7). On average, trenches were 70 centimeters in width, 3 meters in length, and approximately 3 meters in depth. In total, about 80 cubic yards of material were excavated from the 13 trenches. The trench dimensions and descriptions of each trench are contained in Appendix A and Figures 8 and 9 are photographs of the tested Project Area. Excavated soils were raked by hand to identify archaeological materials, with samples periodically screened through a 1/4-inch hardware cloth shaker screen in order to detect smaller cultural materials. In addition, trench sidewalls were examined when possible, though personnel did not enter a trench that was more than 1.5 meters (5 feet) in depth in accordance with the California Occupational Safety and Health Administration (CAL-OSHA) guidelines. All 13 subsurface reconnaissance tests excavated in Lot 3 were negative for archaeological resource indications. Generally, the backhoe trenches encountered fill deposits underlain by natural strata (Trenches 3, 4 and 5), or coarse grained sediments (sand, gravel and cobbles) characteristic of channel deposits and/or fill (Trenches 8-11). At this latter location, a half century or more of grading and cattle activity appears to have removed and/or highly disturbed native topsoil. Several weakly developed old (buried) surfaces were observed in the exploratory trenches that indicated prehistoric archaeological potential, but no actual archaeological materials were identified. Thus the Lot 3 building envelope appears only slightly sensitive for buried prehistoric deposits. DISCUSSION AND RECOMMENDATIONS Because both the archaeological pedestrian survey and subsurface mechanical testing failed to identify evidence of archaeological resources, it is unlikely a significant cultural resource is present within the Project Area. Given this finding, no further archaeological study is recommended unless the project changes substantially to include areas not investigated during this study. However, it is always possible that undetected small, discrete, or isolated archaeological materials or deposits could be encountered during Project construction. In the event that prehistoric or historic-era cultural resources and/or human remains are discovered, there shall be no further excavation or disturbance until a professional archaeologist evaluates the find. Upon completion of the examination, the archaeologist shall submit a report describing the significance of the discovery. Mitigation measures, as recommended by the archaeologist in 1 The decision on trench location benefited from information obtained from Underground Services Alert notifications (Ticket Nos. 156223), though no utilities were in conflict with our testing; the landowner pointed out the location of water lines that fed livestock water troughs and these lines were avoided. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 25 July 2011 Fi g u r e 7 . T e s t T r e n c h L o c a t i o n s . Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 26 July 2011 We s t e r n p or t i o n o f s u b s u r f a c e t e s t i n g a r e a b e t w e e n c r e e k o n r i g ht a n d h i l l s o n l e f t , l o o k i n g w e s t Ea s t l o c u s o f M a g ee R a n c h c o m p le x , l o o k i n g e a s t We s t l o c u s o f M a g ee R a n c h c o m p lex , lookin g wes t Fi g u r e 8 . S e l e c t e d V i e w s o f P r o j e c t A r e a . Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 27 July 2011 Lo o k i n g w e s t a t T r e n c h 2 Lo o k i n g w e s t a t n o r t h w e s t a t h o r s e s t a b l e Lo o k i n g s o u t h w e s t a t o u t b u i l d i n g Fi g u r e 9 . S e l e c t e d V i e w s o f E x p l o r at o r y T r e n c h e s a n d M a g e e R a n c h Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 28 July 2011 Accordance with Section 15064.5 of the CEQA Guidelines, shall be implemented prior to recommencement of construction activity. If human remains of Native American origin are encountered during project construction, it will be necessary to comply with state laws concerning the discovery and disposition of Native American remains, which fall within the jurisdiction of the Native American Heritage Commission (NAHC). If any human remains are discovered or recognized in any location other than a dedicated cemetery, there will be no further excavation or disturbance of the discovery vicinity (typically 100 ft, but under the discretion of the project archaeologist) or any nearby area reasonably suspected to contain additional remains until the County Coroner has been notified and determined that an investigation into the cause of death is not required, the remains are Native American, and the designated Native American Most Likely Descendant (MLD) has been identified by the NAHC and made a recommendation to the land owner or responsible entity for the treatment and disposition of any human remains and associated grave goods as provided in PRC 5097.98; or the NAHC has been unable to identify a descendant or the descendant failed to make a recommendation within 48 hours after being notified. According to the California Health and Safety Code, six or more human burials at one location constitute a cemetery (Section 8100), and any disturbance of Native American cemeteries is a felony (Section 7052). Section 7050.5 requires that construction or excavation be stopped in the vicinity of discovered human remains until the coroner can determine whether the remains are those of a Native American. If the remains are determined to be Native American, the coroner must contact the NAHC within 24 hours. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 REFERENCES CITED Arnold, R.R. 1914 Arnold and Glass Official map of Contra Costa County. On file, Contra Costa County Historical Society [Map G-4]. Scale (ca.1:48,740). 1930 Official map of Contra Costa County. On file, Contra Costa County Historical Society [Map E-070]. Scale (ca.1:67,000). 1938 Official map of Contra Costa County. On file, Contra Costa County Historical Society [Map F-161]. Scale (ca.1:50,000). Banks, P. 1977 Specific reference not known. Cited in Holman 2009 (see below). Bay Area Transportation Study Commission [BATSC] 1965 Aerial photograph. UCB Air Photo 17. Highway Transportation Agency, Department of Public Works, Division of Highways, State of California. Cartwright Aerial Surveys, Inc., Sacramento. Beardsley, R.K. 1948 Cultural Sequences in Central California Prehistory. American Antiquity 14:1:1-28. 1954 Temporal and Areal Relationships in Central California Archaeology. University of California Archaeological Survey Reports 24, 25. Bennyhoff, J.A. 1968 A Delta Intrusion to the Bay in the Late Middle Period in Central California. Paper presented at the Annual Meeting of the Southwestern Anthropological Association and the Society for California Archaeology. San Diego, CA. 1977 Ethnogeography of the Plains Miwok. Center for Archaeological Research at Davis Publication Number 5. University of California at Davis 1994a Central California Augustine: Implications for Northern California Archaeology. In, Toward a New Taxonomic Framework for Central California Archaeology. Contributions of the University of California Archaeological Research Facility, Number 52, pp. 65-74. Berkeley. 1994b Recent Thoughts on Archaeological Taxonomy. In Toward a New Taxonomic Framework for Central California Archaeology, assembled and edited by R.E. Hughes, pp. 105-107. Contributions of the University of California Archaeological Research Facility Number 52. University of California, Berkeley. 1994c Variations within the Meganos Culture. In Toward a New Taxonomic Framework for Central California Archaeology, assembled and edited by R.E. Hughes, pp. 81- 89. Contributions of the University of California Archaeological Research Facility Number 52. University of California, Berkeley Britton & Rey 1871 Topographical map of Contra Costa County. Britton & Rey, San Francisco, CA. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 29 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Crane, R.C. 1995 Geology of the Mount Diablo Region. Northern California Geological Society. Scale (1:24,000). Dibblee, T.W., Jr. 2005 Geologic Map of the Mt. Diablo Quadrangle Contra Costa County, California. Dibblee Geological Center Map No. DF-162. Santa Barbara, CA. ENGEO 2010 Geotechnical Exploration Magee Ranch Danville, California. Submitted to Wendi Baker, SummerHill Homes, San Ramon, CA. Fredrickson, D.A. 1973 Early Cultures of the North Coast Ranges, California. Ph.D. Dissertation, Department of Anthropology, University of California at Davis. 1974 Cultural Diversity in Early Central California: A View from the North Coast Ranges. The Journal of California Anthropology 1:1:41-54. Gerow, B.A. 1974 Co-Traditions and Convergent Trends in Prehistoric California. San Luis Obispo County Archaeological Society Occasional Paper 8. San Luis Obispo, CA. Gerow, B.A. with R.W Force 1968 An Analysis of the University Village Complex with a Reappraisal of Central California Archaeology. Stanford University Press, Stanford, CA. Graymer, R.W., D.L. Jones, and E.E. Brabb 1994 Preliminary Geologic Map Emphasizing Bedrock Formations in Contra Costa County, California: OFR 94-622. Heizer, R.F. 1949 The Archaeology of Central California I: The Early Horizon. University of California Anthropological Records 12:1. University of California Press, Berkeley and Los Angeles. Holman, M.P. 2009 Cultural Resources Study of the Magee Ranch Property, Danville, Contra Costa County, California. Prepared for SummerHill Homes, San Ramon, CA. Hulaniski, F.J. 1917 The History of Contra Costa County California. The Elms Publishing Co., Inc. Berkeley, CA. Kroeber, A.L. 1925 Handbook of the Indians of California. Bureau of American Ethnology Bulletin 78:1-995. (Reprint 1976, Dover, New York). MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 30 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Lillard, J.B., R.F. Heizer, and F. Fenenga [LH&F] 1939 An Introduction to the Archaeology of Central California. Sacramento Junior College, Department of Anthropology Bulletin 2. Loud, L.L. 1924 The Stege Mounds at Richmond, California. University of California Publications in American Archaeology and Ethnology 17:6:355-372. Berkeley. McMahon, T.A. 1908 Official Map of Contra Costa County. Contra Costa County, Martinez, CA. Meyer, J. and J.S. Rosenthal 1998 An Archaeological Investigation of Artifacts and Human Remains from CA-CCO- 637, Los Vaqueros Project Area, Contra Costa County, California. Anthropological Studies Center, Sonoma State University Academic Foundation, Rohnert Park, California. Submitted to the Contra Costa Water District, Concord, California. Technical report on file with the Northwest Information Center, Sonoma State University, Rohnert Park, California. Milliken, R. T. 1995 A Time of Little Choice: The Disintegration of Tribal Culture in the San Francisco Bay Area 1769-1810. Ballena Press Anthropological Papers No. 43. Ballena Press, Menlo Park, CA. Moratto, M.J. 1984 California Archaeology. Academic Press, New York. Nelson, N.C. 1909 Shellmounds of the San Francisco Bay Region. University of California Publications in American Archaeology and Ethnology 7:309-356. Berkeley. 1910 The Ellis Landing Shellmound. University of California Publications in American Archaeology and Ethnology 7:5:357-426. Berkeley. Ragir, S.R. 1972 The Early Horizon in Central California Prehistory. University of California Archaeological Research Facility Contributions 15. Berkeley. Rosenthal, J.S., G.G. White and M.Q. Sutton 2007 The Central Valley: A View from the Catbird’s Seat. In California Prehistory: Colonization, Culture, and Complexity, edited by Terry L. Jones and Kathryn Klar, pp. 147-164. Altamira Press, Walnut Creek, CA. Sauer, V.W. 1960 1960 Official Map of Contra Costa County. On file at the Contra Costa County Historical Society [Map E-283, Map F-100]. Scale (1:95,000). MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 31 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 1971 1965 Official Map of Contra Costa County. On file at the Contra Costa County Historical Society [Map F-66]. Scale (1:100,000). Schenck, W.E. 1926 The Emeryville Shellmound: Final Report. University of California Publications in American Archaeology and Ethnology 23:147-282. Berkeley. Tatam, R.D. 1991 Old Times in Contra Costa: A Journey to the Past. 4th Edition. Highland Publishers, Pittsburg, California. Uhle, M. 1907 The Emeryville Shellmound. University of California Publications in American Archaeology and Ethnology 7:106. Berkeley. United States Agricultural Adjustment Administration [USAAA] 1939 Aerial photograph. UCB Air Photo 28, BUU-279-109, July 25, 1939. United States Census Bureau 1970 Schedule 1 (pg 12), Inhabitants of Township Two, Contra Costa County, United States Census Bureau, Washington, D.C 1980 Schedule 1 (pg 23), Inhabitants of Green Valley, Contra Costa County, United States Census Bureau, Washington, D.C United States Department of Agriculture [USDA] 1977 Soil Survey of Contra Costa County, California. Prepared by the United States Department of Agriculture Soil Conservation Service in cooperation with University of California Agricultural Experiment Station. United States Department of Interior, General Land Office 1871 GLO Land Records (www.glorecords.blm.gov) (CACAAA 000577). 1874 GLO Land Records (www.glorecords.blm.gov) (CACAAA 136843). United State Geological Survey [USGS] 1896 Mt. Diablo, California 15’ Quadrangle. Geological Survey, Washington, D.C. 1953 Mt. Diablo, California 7.5’ Quadrangle, Geological Survey, Washington, D.C. 1973 Mt. Diablo, California 7.5’ Quadrangle, Geological Survey, Washington, D.C. 1980 Mt. Diablo, California 7.5’ Quadrangle, Geological Survey, Washington, D.C. Wiberg, R.S. 1988 The Santa Rita Village Mortuary Complex (CA-Ala-413): Evidence and Implications of a Meganos Intrusion. Master's Thesis, Department of Anthropology, San Francisco State University. Coyote Press Archives of California Prehistory 18 [1988 reprint]. Coyote Press, Salinas, CA. MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 32 July 2011 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 MaGee Ranch Holman & Associates Archaeological Survey and Subsurface Testing 33 July 2011 2010 Archaeological Investigations at CA-CCO-18/548: Final Report for the Vineyards at Marsh Creek Project, Contra Costa County, California. Prepared for Shea Homes, Brentwood, CA. On file, Northwest Information Center, California Historical Resources Information System, Sonoma State University, Rohnert Park, CA. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 APPENDIX A TRENCH DESCRIPTIONS DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 1 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 280 85 312 E-W Depth Strat. Horizon Description of Soil Profile: 0-40 40-70 70-119 119-159 159-240 240-312 Brown silt clay loam, 30cm Ap on surface Very dark gray brown silt clay, few roots decreasing with depth Same with calcium carbonate filaments Gray brown silt clay, calcium carbonate inclusion Gray tan silt, gravels in sandy matrix, poorly sorted Gray brown sandy clay, massive, increasing sand with depth Comments/Results: No cultural materials Trench No. Area Site Locus Setting 2 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 300 80 301 E-W Depth Strat. Horizon Description of Soil Profile: 0-50 50-103 103-141 141-193 193-259 259-301 Brown silt clay loam, 50cm Ap on surface Gray brown silt, increasing calcium carbonate with depth Very dark gray brown silt clay, friable Greenish gray silt clay, massive structure Fine gray brown silt clay, mottled, mineral deposits Brown silt clay, standing water at 290 cm Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 3 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 290 70 278 E-W Depth Strat. Horizon Description of Soil Profile: 0-84 84-119 119-148 148-160 160-172 172-220 220-278 Light tan silt clay (fill) Brown silty clay loam Dark grayish brown silt clay, no rock Sand Fine gray silt clay; moist Very dark grayish brown silt clay; more structure Dark grayish brown clay Comments/Results: No cultural materials Trench No. Area Site Locus Setting 4 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 300 70 293 E-W Depth Strat. Horizon Description of Soil Profile: 0-23 23-125 125-234 234-293 Gravel (fill) Very dark grayish brown silt clay Dark brown silt clay, few small gravels, more friable with depth Same color, higher clay content, more structure Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 5 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 290 70 277 E-W Depth Strat. Horizon Description of Soil Profile: 0-13 13-59 59-66 66-129 129-180 180-277 Sand and small gravel (fill), contains clam shell Very dark gray brown silt clay; reworked soil, scant shell flecks Sand and gravel (fill), some shell Very dark brown silt clay, calcium carbonate Dark brown silt clay Brown silt clay, some water Comments/Results: No cultural materials Trench No. Area Site Locus Setting 6 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 330 70 296 E-W Depth Strat. Horizon Description of Soil Profile: 0-88 88-157 157-228 228-296 Dark grayish brown silt clay, blocky Slightly fainter clay films but fundamentally the same strong SAB structure Brown silty to sandy clay Slightly lighter, higher clay content Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 7 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 290 70 285 E-W Depth Strat. Horizon Description of Soil Profile: 0-40 40-70 70-152 152-177 177-252 252-285 Brown silt clay, 40 cm Ap on surface Dark grayish brown silt clay loam, common root holes Very dark grayish brown silt clay Grayish brown silt clay, more friable Brown silt clay Brown sandy silt clay, friable Comments/Results: No cultural materials Trench No. Area Site Locus Setting 8 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 300 70 262 E-W Depth Strat. Horizon Description of Soil Profile: 0-106 106-152 152-262 Sandy silt with increasing gravels (fill?), cobbles to 10+ cm Sand and gravel Brown to grayish brown silt clay, moderately stiff, no gravel Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 9 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 320 70 291 E-W Depth Strat. Horizon Description of Soil Profile: 0-35 35-78 78-155 155-210 210-291 Grayish brown sandy silt, 25 cm Ap on surface Light brown/tan sandy silt, gravel lens at 57 cm Brown sand with gravel, cobbles to 15 cm Brown silt clay, very stiff, no gravel Yellowish brown silt clay, stiff Comments/Results: No cultural materials Trench No. Area Site Locus Setting 10 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 280 70 70 E-W Depth Strat. Horizon Description of Soil Profile: 0-22 22-70 Gray gravelly sandy silt Large pieces of asphalt at 60-65 cm, trench terminated Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 11 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 309 70 290 E-W Depth Strat. Horizon Description of Soil Profile: 0-35 35-179 179-290 Gray gravelly sand (fill) Dark brown/black silt clay Dark grayish brown silt clay, stiff, gradual transition Comments/Results: No cultural materials Trench No. Area Site Locus Setting 12 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 310 70 308 E-W Depth Strat. Horizon Description of Soil Profile: 0-18 18-136 136-230 230-280 280-308 Brown silt clay Very dark grayish brown/black silt clay, calcium carbonate, stiff Very dark grayish brown silt clay, more friable Grayish brown silt clay Brown sandy clay Comments/Results: No cultural materials DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HOLMAN & ASSOCIATES TRENCH FORM Project: Magee Ranch Date: 5/25/11 Recorded By: RW, KD Trench No. Area Site Locus Setting 13 Lot 3 No N/A Floodplain Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) 330 70 270 E-W Depth Strat. Horizon Description of Soil Profile: 0-25 25-62 62-182 182-220 220-270 Grayish brown silt clay, reworked or fill Very dark grayish brown silt clay, possibly reworked Same but not reworked, stiff Grayish brown silt clay, stiff Brown silt clay, calcium carbonate filaments Comments/Results: No cultural materials Trench No. Area Site Locus Setting Length Width Depth Provenience (datum to SW corner) Orientation (from SW corner) Depth Strat. Horizon Description of Soil Profile: Comments/Results: DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 S - 3 8 9 0 8 a D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 CULTURAL RESOURCES ASSESSMENT REPORT Magee Ranch Project Town of Danville, Contra Costa County, California PREPARED FOR: Wendi Baker Land Acquisition Manager SummerHill Land 5000 Executive Parkway, Suite 150 San Ramon, CA 94583 PREPARED BY: WSA POBox2192 Orinda, CA 94563 S-38908bDocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Do c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 S - 3 8 9 0 8 c D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 D o c u S i g n E n v e l o p e I D : 4 0 3 2 D 1 C 2 - 7 8 8 2 - 4 5 D A - 9 4 5 2 - 9 D 0 6 6 1 6 E 1 1 9 2 ATTACHMENT C – NATIVE AMERICAN COMMUNICATIONS DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Costanoan Me-Wuk Pomo Costanoan Costanoan Amah MutsunTribal Band of Mission San Juan Bautista Irene Zwierlein, Chairperson 3030 Soda Bay Road Lakeport, CA 95453 Phone: (650) 851 - 7489 Fax: (650) 332-1526 amahmutsuntribal@gmail.com Chicken Ranch Rancheria of Me-Wuk Indians Lloyd Mathiesen, Chairperson P.O. Box 1159 Jamestown, CA, 95327 Phone: (209) 984 - 9066 Fax: (209) 984-9269 lmathiesen@crtribal.com Guidiville Indian Rancheria Donald Duncan, Chairperson P.O. Box 339 Talmage, CA, 95481 Phone: (707) 462 - 3682 Fax: (707) 462-9183 admin@guidiville.net Indian Canyon Mutsun Band of Costanoan Kanyon Sayers-Roods, MLD Contact 1615 Pearson Court San Jose, CA, 95122 Phone: (408) 673 - 0626 kanyon@kanyonkonsulting.com Indian Canyon Mutsun Band of Costanoan Ann Marie Sayers, Chairperson P.O. Box 28 Hollister, CA, 95024 Phone: (831) 637 - 4238 ams@indiancanyon.org Muwekma Ohlone Indian Tribe of the SF Bay Area Monica Arellano, Vice Chairwoman 20885 Redwood Road, Suite 232 Castro Valley, CA, 94546 Phone: (408) 205 - 9714 marellano@muwekma.org Costanoan Nashville Enterprise Miwok- Maidu-Nishinam Tribe Cosme Valdez, Chairperson P.O. Box 580986 Elk Grove, CA, 95758-0017 Phone: (916) 429 - 8047 Fax: (916) 429-8047 valdezcome@comcast.net Miwok North Valley Yokuts Tribe Katherine Perez, Chairperson P.O. Box 717 Linden, CA, 95236 Phone: (209) 887 - 3415 canutes@verizon.net Costanoan Northern Valley Yokut North Valley Yokuts Tribe Timothy Perez, P.O. Box 717 Linden, CA, 95236 Phone: (209) 662 - 2788 huskanam@gmail.com Costanoan Northern Valley Yokut The Ohlone Indian Tribe Andrew Galvan, P.O. Box 3388 Fremont, CA, 94539 Phone: (510) 882 - 0527 Fax: (510) 687-9393 chochenyo@AOL.com Bay Miwok Ohlone Patwin Plains Miwok Wilton Rancheria Jesus Tarango, Chairperson 9728 Kent Street Elk Grove, CA, 95624 Phone: (916) 683 - 6000 Fax: (916) 683-6015 jtarango@wiltonrancheria-nsn.gov Miwok Wilton Rancheria Steven Hutchason, THPO 9728 Kent Street Elk Grove, CA, 95624 Phone: (916) 683 - 6000 Fax: (916) 863-6015 shutchason@wiltonrancheria- nsn.gov Miwok 1 of 2 This list is current only as of the date of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of the Health and Safety Code, Section 5097.94 of the Public Resource Section 5097.98 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed 3811-01 Galindo Creek Restoration Project, Contra Costa County. PROJ-2021- 001023 02/24/2021 04:04 PM Native American Heritage Commission Native American Contact List Contra Costa County 2/24/2021 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Wilton Rancheria Dahlton Brown, Director of Administration 9728 Kent Street Elk Grove, CA, 95624 Phone: (916) 683 - 6000 dbrown@wiltonrancheria-nsn.gov Miwok The Confederated Villages of Lisjan Corrina Gould, Chairperson 10926 Edes Avenue Oakland, CA, 94603 Phone: (510) 575 - 8408 cvltribe@gmail.com Bay Miwok Ohlone Delta Yokut 2 of 2 This list is current only as of the date of this document. Distribution of this list does not relieve any person of statutory responsibility as defined in Section 7050.5 of the Health and Safety Code, Section 5097.94 of the Public Resource Section 5097.98 of the Public Resources Code. This list is only applicable for contacting local Native Americans with regard to cultural resources assessment for the proposed 3811-01 Galindo Creek Restoration Project, Contra Costa County. PROJ-2021- 001023 02/24/2021 04:04 PM Native American Heritage Commission Native American Contact List Contra Costa County 2/24/2021 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Pacific Legacy Inc. Native American Contact Log Project No. and Name Diablo Road Trail Project Recorder John Holson Date February 6, 2022 Organization Contact Letter E-mail Phone Comments Amah Mutsun Tribal Band of Mission San Juan Bautista Ms. Irene Zwierlein, Chairperson 1/8/2022 2/4/2022 No comments to date Chicken Ranch Rancheria of Me- Wuk Indians Mr. Lloyd Mathiesen, Chairperson 1/8/2022 2/4/2022 No comments to date Guidiville Indian Rancheria Mr. Donald Duncan, Chairperson 1/8/2022 2/4/2022 No comments to date Indian Canyon Mutsun Band of Costanoan Ms. Kanyon Sayers- Roods, MLD contact 1/8/2022 2/4/2022 No comments to date Indian Canyon Mutsun Band of Costanoan Ms. Ann Marie Sayers, Chairperson 1/8/2022 2/4/2022 No comments to date Muwekma Ohlone Indian Tribe of the SF Bay Area Ms. Monica Arellano, Chairperson 1/8/2022 2/4/2022 No comments to date Nashville Enterprise Miwok- Maidu-Nishinam Tribe Mr. Cosme Valdez, Chairperson 1/8/2022 2/4/2022 No comments to date DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Pacific Legacy Inc. Native American Contact Log Project No. and Name Diablo Road Trail Project Recorder John Holson Date February 6, 2022 Organization Contact Letter E-mail Phone Comments North Valley Yokuts Tribe Ms. Katherine Erolinda Perez, Chairperson 1/8/2022 2/4/2022 No comments to date North Valley Yokuts Tribe Timothy Perez 1/8/2022 2/4/2022 No comments to date The Ohlone Indian Tribe Mr. Andrew Galvan 1/8/2022 2/4/2022 No comments to date Wilton Rancheria Mr. Jesus Tarango, Chairperson 1/8/2022 Cultural Preservation Department, Wilton Rancheria indicated on 1/27/22 it had no concerns regarding the project Wilton Rancheria Mr. Steven Hutchason, THPO 1/8/2022 Cultural Preservation Department, Wilton Rancheria indicated on 1/27/22 it had no concerns regarding the project Wilton Rancheria Mr. Dahlton Brown, Director of Administration 1/8/2022 Cultural Preservation Department, Wilton Rancheria indicated on 1/27/22 it had no concerns regarding the project The Confederated Villages of Lisjan Ms. Corrina Gould, Chairperson 1/8/2022 2/4/2022 No comments to date DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Amah Mutsun Tribal Band of Mission San Juan Bautista Ms. Irene Zwierlein, Chairperson 3030 Soda Bay Road Lakeport, CA 95453 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Zwierlein: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Chicken Ranch Rancheria of Me-Wuk Indians Mr. Lloyd Mathiesen, Chairperson P.O. Box 1159 Jamestown, CA 95327 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Mathiesen: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Ms. Corrina Gould, Chairperson 10926 Edes Avenue Oakland, CA 94603 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Gould: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Guidiville Indian Rancheria Mr. Donald Duncan, Chairperson P.O. Box 339 Talmage, CA 95481 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Duncan: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Indian Canyon Mutsun Band of Costanoan Ms. Ann Marie Sayers, Chairperson P.O. Box 28 Hollister, CA 95024 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Sayers: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Indian Canyon Mutsun Band of Costanoan Ms. Kanyon Sayers-Roods, MLD Contact 1615 Pearson Court San Jose, CA 95122 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Sayers-Roods: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Muwekma Ohlone Indian Tribe of the SF Bay Area Ms. Monica Arellano, Vice Chairwoman 20885 Redwood Road, Suite 232 Castro Valley, CA 94546 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Arellano: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 North Valley Yokuts Tribe Ms. Katherine Perez, Chairperson P.O. Box 717 Linden, CA 95236 RE: Town of Danville Proposed Diablo Road Trail Dear Ms. Perez: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 North Valley Yokuts Tribe Mr. Timothy Perez P.O. Box 717 Linden, CA 95236 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Perez: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Nashville Enterprise Miwok-Maidu-Nishinam Tribe Mr. Cosme Valdez, Chairperson P.O. Box 580986 Elk Grove, CA 95758-0017 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Valdez: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 The Ohlone Indian Tribe Mr. Andrew Galvan P.O. Box 3388 Fremont, CA 94539 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Galvan: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Wilton Rancheria Mr. Dahlton Brown, Director of Administration 9728 Kent Street Elk Grove, CA 95624 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Brown: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Wilton Rancheria Mr. Steven Hutchason, THPO 9728 Kent Street Elk Grove, CA 95624 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Hutchason: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 “Small Town Atmosphere Outstanding Quality of Life” January 8, 2022 Wilton Rancheria Mr. Jesus Tarango, Chairperson 9728 Kent Street Elk Grove, CA 95624 RE: Town of Danville Proposed Diablo Road Trail Dear Mr. Tarango: The Town of Danville, Contra Costa County is conducting environmental studies for a proposed Diablo Road Trail project located in the Town of Danville. The Town of Danville is the lead agency responsible for compliance with the California Environmental Quality Act (CEQA). It is anticipated that an Initial Study/Mitigated Negative Declaration (IS/MND) will be prepared by the Town of Danville as the Lead Agency, in conformance with the California Environmental Quality Act (CEQA), the CEQA Guidelines (Title 14, California Code of Regulations §15000 et seq.), and the regulations and policies of the Town of Danville. The purpose of this IS/MND is to provide the public with objective information regarding the environmental consequences of the proposed project. The Town of Danville wishes to consult with Native American tribes for undertakings early in the project planning process to identify and discuss relevant cultural resource issues, resolve concerns about the confidentiality of information on historic properties, and allow adequate time for consideration of such concerns. The project site is an approximately 0.9 mile long corridor, located south of Diablo Road, extending east from the intersection of Fairway Drive and Diablo Road to approximately 380 feet west of the intersection of Avenue Nueva and Diablo Road in Danville, Contra Costa County, California. The proposed trail would be within the Town of Danville. Please see the attached maps for Project location details (Figures 1 and 2). The project consists of construction of an 8- to 12-foot-wide off-street paved multi-use trail along the southern shoulder of Diablo Road. The proposed project will connect the Diablo Road/Green Valley Road corridor to the west to Blackhawk Road/Mt. Diablo State Park south access to the east. The proposed project would provide bicyclists a safer alternative to Diablo Road and would help close a multi-purpose trail gap between the existing Barbara Haile Trail and access to Mount Diablo State Park. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Page 2 The proposed path would be 8 feet wide with 2-foot shoulders for a total width of 12 feet in most locations. Typically, the trail would be an asphalt trail installed over aggregate base, with gravel shoulders. Guard rails, fencing, and retaining walls would be constructed where the trail is constrained either by existing physical or topographic features, property lines, and easement boundaries. Please consider this letter as formal notification of the Diablo Road Trail project as required under CEQA, specifically Public Resources Code 21080.3.1 and Chapter 532 Statutes of 2014 (i.e., AB 52). We respectfully request that you respond within 30 calendar days of receipt of this letter, pursuant to PRC 21080.3.1(d) if you would like to consult on this project. Please provide a designated lead contact person if you have not provided that information to us already. A record search received from the Northwest Information Center (NWIC) on December 20, 2021, by Pacific Legacy Inc., our cultural resources consultant, indicates there are no previously documented Native American or historic period archeological sites within the Area of Direct Impact (ADI) of the proposed trail. The trail area has been the subject of two previous cultural resource studies with negative results. No resources or reports were reported within 0.25 miles of the ADI by the NWIC. We have requested a Native American Heritage Commission (NAHC) search of the Sacred Lands File on November 30, 2021, but have not received the results as of yet. The Town of Danville would like to afford you with an opportunity to communicate concerns you might have regarding places within the project area that may be important to your community. The Town of Danville requests your participation in the identification and protection of cultural resources, sacred lands, or other heritage sites within the above described project area with the understanding that you or other members of the community might possess specialized knowledge of the area. If you or any of your tribal members have any questions or concerns regarding this project, please contact me at 925-314-3348 or nsalama@danville.ca.gov. Sincerely, Nadar Salama Senior Civil Engineer Town of Danville DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 From:Kamerath, Marcy To:John Holson Subject:FW: Town of Danville Proposed Diablo Road Trail Date:Thursday, January 27, 2022 5:19:24 PM Attachments:image001.png Marcy Kamerath Kimley-Horn | 1300 Clay Street, Suite 325, Oakland, CA 94612 Direct: 510 250 2106 | Cell: 775 412 2770 Connect with us: Twitter | LinkedIn | Facebook | Instagram | Kimley-Horn.com Proud to be one of FORTUNE magazine’s 100 Best Companies to Work For My typical schedule is M-Th 8:30am – 4:30pm From: Nader Salama <nsalama@danville.ca.gov> Sent: Thursday, January 27, 2022 5:18 PM To: Kamerath, Marcy <Marcy.Kamerath@kimley-horn.com> Subject: FW: Town of Danville Proposed Diablo Road Trail FYI From: Cultural Preservation Department Inbox <cpd@wiltonrancheria-nsn.gov> Sent: Thursday, January 27, 2022 10:16 AM To: Nader Salama <nsalama@danville.ca.gov> Cc: Cultural Preservation Department Inbox <cpd@wiltonrancheria-nsn.gov> Subject: Town of Danville Proposed Diablo Road Trail ***CAUTION*** THIS EMAIL WAS NOT SENT FROM DANVILLE STAFFThis email originated from outside of the Town of Danville and was not sent from aTown Staff member! Do not click on links or open attachments unless you recognizethe sender and know the content is safe. Good morning, Thank you for sending over the project notification for the Town of Danville Proposed Diablo Road Trail Project. Wilton Rancheria has no concern on this project. Thank you Cultural Preservation Department Wilton Rancheria Tel: 916.683.6000 | Fax: 916.683.6015 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 9728 Kent Street | Elk Grove | CA | 95624 cpd@wiltonrancheria-nsn.gov wiltonrancheria-nsn.gov DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 ATTACHMENT D – PHOTOGRAPHIC DOCUMENTATION DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D1 Photograph No. 1 Direction: Northwest Date: 1/18/22 Photographer: E. Reese Description: (Frame 6644) At entry gate, facing Alameda Diablo Intersection. Photograph No. 2 Direction: Northwest Date: 1/18/22 Photographer: E. Reese Description: (Frame 6645) At Alameda Diablo/ Diablo Rd intersection, Creek enters large CMP culvert here. Slopes are very steep in area. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D2 Photograph No. 3 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6646) Along the row of eucalyptus trees; no soil visible. Creek banks steep. Photograph No. 4 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6647) At Calle Arroyo intersection; creek bank very steep on opposite side; did not survey. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D3 Photograph No. 5 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6648) Facing Calle Arroyo from west side; showing open space next to creek. Photograph No. 6 Direction: South Date: 1/18/22 Photographer: E. Reese Description: (Frame 6649) Across creek from trail alignment, board- molded concrete retaining walls/bridge abutment at creek bend. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D4 Photograph No. 7 Direction: East- southwest Date: 1/18/22 Photographer: E. Reese Description: (Frame 6650) Across creek from trail alignment, board- molded concrete retaining walls/bridge abutment at creek bend. Photograph No. 8 Direction: North Date: 1/18/22 Photographer: E. Reese Description: (Frame 6651) Concrete cylindrical water trough at Fairway Drive intersection. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D5 Photograph No. 9 Direction: Northwest Date: 1/18/22 Photographer: E. Reese Description: (Frame 6652) View of board-molded concrete walls feature with 6-ft. scale. Photograph No. 10 Direction: Northeast Date: 1/18/22 Photographer: E. Reese Description: (Frame 6653) Overview of board- molded walls from south side of creek. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D6 Photograph No. 11 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6654) East trail segment towards segment end. Photograph No. 12 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6655) East Segment at PG&E vault, facing east; note slope steepness. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D7 Photograph No. 13 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6656) East segment at area near eastern of two road curves-flatter terrain. Photograph No. 14 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6657) East segment at area near eastern of two road curves-flatter terrain. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D8 Photograph No. 15 Direction: - Date: 1/18/22 Photographer: E. Reese Description: (Frame 6658) Close- up of isolated bricks near oak tree with 3- ft scale. Photograph No. 16 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6659) Close- up of isolated bricks near oak tree with 3- ft scale. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D9 Photograph No. 17 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6660) Culvert along Diablo Road edge, east of curves. Photograph No. 18 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6661) East segment overview of east end DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D10 Photograph No. 19 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6662) East end of trail alignment, graded flat and construction impacts. Photograph No. 20 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6663) East end of trail alignment, huge utility pipe construction at east end of trail alignment. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D11 Photograph No. 21 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6664) Utility disturbance, east end trail alignment. Photograph No. 22 Direction: West Date: 1/18/22 Photographer: E. Reese Description: (Frame 6665) Overview of east trail segment. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Attachment D: Pacific Legacy, Inc. Survey Photographic Documentation Diablo Road Trail Project Contra Costa County, California February 2022 D12 Photograph No. 23 Direction: East Date: 1/18/22 Photographer: E. Reese Description: (Frame 6666) East segment, drainage/culvert pipe disturbance between Diablo Rd and ranch road. Photograph No. 24 Direction: Southwest Date: 1/18/22 Photographer: E. Reese Description: (Frame 6667) Concrete cylindrical water trough at Fairway Drive intersection. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville Diablo Road Trail Draft IS/MND September 2022 Appendix D Preliminary Geohazards Study DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 GEOTECHNICAL ENVIRONMENTAL WATER RESOURCES CONSTRUCTION SERVICES COASTAL/MARINE GEOTECHNICS 2010 Crow Canyon Place, Suite 250  San Ramon, CA 94583  (925) 866-9000  Fax (888) 279-2698 www.engeo.com Project No. 8870.000.011 May 25, 2022 Mr. Nader Salama Town of Danville 510 La Gonda Way Danville, CA 94526 Subject: Diablo Road Pedestrian Trail Danville, California PRELIMINARY GEOHAZARDS STUDY References: 1. ENGEO; Preliminary Geotechnical Exploration for Tentative Map, Magee Ranches Project, Danville, California; December 27, 2010, Latest Revision May 1, 2012; Project No. 8889.000.000. 2. Contra Costa County Flood Control and Water Conservation District; Preliminary Upper Green Valley Creek Hydrology Study; Revised April 22, 2021. Dear Mr. Salama: We are pleased to prepare this report in regard to the Diablo Road Pedestrian Trail project located in Danville, California. The purpose of this report is to identify potential geologic hazards associated with the development of the trail and to provide preliminary recommendations to mitigate geologic hazards associated with Green Valley Creek which runs adjacent to the currently proposed trail alignment. PROPOSED PROJECT Based on a draft plan set you provided, dated December 10, 2021, the subject 12-foot-wide trail is proposed to start from Diablo Road near Fairway Drive and extend approximately 0.9 mile along the south side of Diablo Road to approximately the Alameda-Diablo Culvert over Green Valley Creek as shown Figure 1. The preliminary trial alignment is located in a narrow strip of land between Diablo Road and Green Valley Creek, with much of the trail within 20 feet of the Green Valley Creek top-of-bank. Based on our experience with other projects in the area, several retaining walls will need to be constructed at the outboard of the trail in order to accommodate the trail to remain geotechnically stable given the proximity of the alignment to the creek banks. Based on the detail on the plan set, the trail will have an 8-foot-wide paved section with a 2-foot-wide shoulder along each side of the trail. The paved section of the trail will consist of 2-inch asphalt concrete over 8-inch aggregate base and the shoulders will consist of 8-inch aggregate base. A fence will be constructed at the outboard side of the trail where needed and a guardrail will be constructed at the inboard side of the trail near Diablo Road where necessary. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville 8870.000.011 Diablo Road Pedestrian Trail May 25, 2022 PRELIMINARY GEOHAZARDS STUDY Page 2 PREVIOUS EXPLORATION Our preliminary geotechnical exploration (Reference 1) for Magee Ranch project included drilling one boring at the south side of Green Valley Creek near the beginning of the proposed trail in 2010. The approximate location of the boring is shown in Figure 1, and the boring log is presented in Appendix A. GEOLOGIC SETTING As discussed earlier, the proposed trail project is located along a portion of Diablo Road adjacent to Green Valley Creek. Diablo Road within the project limits is located at the edge of a relatively flat alluvial plain, which extends northward towards the base of Mount Diablo. Immediately south of Diablo Road, Green Valley Creek has incised approximately 18 feet vertically into the alluvial plain. The creek banks can be characterized as having near vertical slopes and significant erosional scarps, especially along outer bends of the creek channel. On the opposite bank of Green Valley Creek, a large spur ridge extends approximately 200 feet vertically from the creek bottom at a 2:1(horizontal:vertical) slope. On March 18, 2022, an ENGEO Engineering Geologist and Geotechnical Engineer, walked the reach of creek immediately adjacent to the proposed trail to provide a reconnaissance of the slopes. Geologic mapping is approximately depicted in Figure 1. In general, the creek banks along Green Valley Creek consist of Tassajara-Green Valley Formation bedrock (Tgvt). Bedrock of the Tassajara-Green Valley Formation typically consists of weakly indurated sandstone, siltstone, and claystone with thin beds of pebble conglomerate. Alluvial deposits (Qoal) are also present along terraced areas of the creek bed. The alluvium generally consist of silty clay with interbedded clayey sand. Areas of over steepened creek bank and localized areas of sloughing on or along portions of the creek bank adjacent to where the trail is proposed were not shown on Figure 1. However, some active landsliding was noted on the opposite bank. Surficial soil underlying the trail alignment appears to consist of clayey material. The clayey soil found in the site vicinity is typically expansive. Expansive soil shrinks and swells as a result of seasonal fluctuation in moisture content. This can cause heaving and cracking of slabs-on-grade, pavements, and structures founded on shallow foundations. Damage due to volume changes associated with expansive soil can be reduced through proper foundation design. Soil creep is a natural process that involves slow downhill movement of soil mantle on a slope. Soil creep consists of lateral extension and vertical settlement. Soil creep results when surficial expansive soil is subjected to wetting and drying cycles caused by seasonal moisture changes, precipitation, and/or long-term landscape irrigation; by the growth of roots; and by burrowing animals. The amounts of vertical and horizontal movement are a function of the soil physical characteristics, such as plasticity, height and gradient of the downhill slope, and the depth of wetting and drying cycles. Improvements constructed on or near downhill slopes will be impacted by soil creep. HYDROLOGIC SETTING The path is proposed along a reach of Green Valley Creek immediately downstream of the Alameda Diablo Road culvert. According to the preliminary studies performed by the Contra Costa County Flood Control and Water Conservation District, this reach of Green Valley Creek has a 100-year, 6-hour peak flow rate of approximately 1,879 cubic feet per second (ft3/s). DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville 8870.000.011 Diablo Road Pedestrian Trail May 25, 2022 PRELIMINARY GEOHAZARDS STUDY Page 3 ENGEO conducted a fluvial hydraulic analysis of this portion of the Green Valley Creek using the Hydrologic Engineering Center River Analysis System (HEC-RAS) 6.1 computer program published by the United States Army Corps of Engineers (USACE). HEC-RAS enables us to perform one-dimensional hydraulic analyses for natural channels and is intended for calculating water surface profiles and velocities in steady, gradually varied flow conditions. The basic HEC-RAS computational procedure is based on the solution of the one-dimensional energy equation. Energy losses consist of friction losses based on Manning's equation. The development of the HEC-RAS model specific to this study is described in detail below. Survey data provided by the Town of Danville dated 2022 was used to determine the existing condition cross-sections which were input into the model. The preliminary analysis shows that 100-year water surface elevations are generally contained within the limits of the banks and would not flood the trail as proposed. However, minor overtopping during 100-year storm events may occur between HEC-RAS stations 11+29.75 and 14+52.05 depending on the final vertical elevation of the trail alignment as shown on Figure 2. Creek velocities are generally between 5 and 16 feet per second (ft/s) in the area along the bank where the project is proposed. However, in area where 90-degree bends occur in the creek channel (Stations 11+29.75 and 8+97.45), channel velocities may be somewhat higher on the outer bank than as estimate by HEC-RAS. Based on a methodology published by the Natural Resource Conservation Service (NRCS), velocities may increase by a factor of depending of the radius of curvature. We estimate outer bank velocities for these areas to be approximately 9 and 25 feet per second, respectively. These two bend areas will likely require scour countermeasures such as rock rip-rap to provide effective erosion protection to the creek bank to prevent lateral migration of the creek into the proposed trail alignment. Bank stabilization in these areas should be considered in the final design of the wall proposed along these banks. A more detailed hydraulic study can be performed at the time of final design. HEC-RAS cross sections are shown on Figure 2. The result of the analysis is in Appendix B of this document. DISCUSSION Based on our experience with similar projects in the area, where development directly at the top of bank is proposed, we make the following recommendations. • Areas, where the trail is located beyond a projection of 1:1 (horizontal:vertical) from the toe of creek bank, will likely not require substantial subsurface improvement in order for the trail to be performed adequately over the long term. We do expect the possibility of “creep” movement of the near-surface expansive clayey materials in these areas, which may affect the performance of the trail. As a result, the trail may require periodical monitoring and occasional maintenance of the pavement by the Town of Danville. • In areas where the trail lies greater than 5 feet from the top-of bank but within the above-mentioned 1:1 projection from the toe of creek bank slope, we would recommend providing some soil reinforcement underneath the area where the trail is proposed. This reinforcement would likely consist of several layers of geogrid underlying the pavement section specified on the plans and may also include a mechanically stabilized earth wall. The geogrid would help resist movement of expansive soil underneath the trail towards direction of the creek bank especially under saturated conditions. DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Town of Danville 8870.000.011 Diablo Road Pedestrian Trail May 25, 2022 PRELIMINARY GEOHAZARDS STUDY Page 4 • For areas where the proposed alignment is located less than 5 feet from the top-of-bank, we would recommend the consideration of a retaining wall. The wall would consist of either a soldier pile wall with wood lagging or potentially a sheet pile structure. The retaining walls would need to extend approximately 5 to10 feet below the flowline of the creek and extend upward to the vertical alignment of the trail. We would recommend buried rock toe protection in areas where the walls are proposed in order to prevent scouring of the retaining structure based on velocities determined in our hydraulic analysis. • An existing 12-foot-diameter culvert is located beneath Diablo Road near Alameda Diablo at Station 10+50 of the proposed trail. Based on a corrosion study of the existing culvert conducted in 2020, the culvert has experienced damage due to corrosion and undermining of bedding under the culvert. Based on the height of the culvert and the shallow backfill from the ground surface, the proposed improvement/retaining wall of the trail will impact on the existing culvert. The evaluation of the integrity of the culvert to receive improvements is not within our scope of services and should be performed by a structural engineer. If you have any questions regarding the content of this letter, please do not hesitate to contact us. Sincerely, ENGEO Incorporated Jonathan Buck, GE Macy Tong, GE jb/mt/ca Attachments: Figures 1 and 2 Appendix A – Log of Boring B-5 Appendix B – HEC-RAS Output DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 8870.000.011 May 25, 2022 FIGURE 1 – Geologic Map FIGURE 2 – HEC-RAS Existing Conditions DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Qaf Qc Qc Qoal Qhal/Tgvt Qc Qc ?? Qaf Qls Tgvt Tgvt Tgvt Qc Qc Qoal Qc Qc Qhal/Tgvt Qhal/Tgvt Qhal/Tgvt Qhal/TgvtQhal/Tgvt Qoal Qoal Qoal Qoal Qoal B-5 DiabloRdDiabloRdDiabloRd DiabloRdDiabloRd Alameda DiabloAlamedaDiabloAlamedaDiabloAlamedaDiabloAlamedaDiablo C a l l e A r r o y o C a l l e A r r o y o C a l l e A r r o y o C a l l e A r r o y o C a l l e A r r o y o F a i r w a y D r F a i r w a y D r F a i r w a y D r F a i r w a y D r F a i r w a y D r ? ? ?? EXPLANATION 0 FEET 40 GEOLOGIC MAP DIABLO ROAD PEDESTRIAN TRAIL DANVILLE, CALIFORNIA 8870.000.011 AS SHOWN 1 Qaf Qc Qhal/Tgvt FILL (UNDOCUMENTED) COLLUVIUM HOLOCENE ALLUVIUM OVERLYING BEDROCK IN CREEK CHANNEL OLDER ALLUVIAL TERRACE DEPOSITS TASSAJARA GROUP BEDROCK BORING (ENGEO, 2010) GEOLOGIC CONTACT Tgvt Qoal CONCRETE GRADE CONTROL STRUCTURE CREEK BANK UNDERCUT ALONG THIS STRETCH CONCRETE STRUCTURE DUAL STORM DRAIN OUTFALL CULVERT B-5 PROPOSED TRAIL DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 1 +0 8 .3 5 1 +9 9 .5 9 3 +4 3 .8 3 4 +3 7 .1 4 5 +2 9 .9 6 6+ 0 2 . 8 2 6 + 4 0 .3 5 6+80.92 7 + 4 1 . 8 1 8 +1 7 .5 4 8 +5 8 .3 4 8 +9 7 .4 5 9 +4 0 .2 9 9 +7 8 .4 6 1 0 +2 3 .9 2 1 0 +8 7 .6 1 1 1 + 2 9 . 7 5 1 1 +8 9 .7 4 1 2 +3 8 .0 3 1 3 +0 1 .6 7 1 3 +6 3 .8 8 1 4 +2 0 .0 4 1 4 +5 2 .0 5 1 4 +8 3 .2 9 1 5 +1 4 .0 1 1 5 +4 3 .2 5 1 5 +9 0 .8 4 1 6 +1 7 .7 2 1 6 +5 8 .4 8 1 6 +7 1 .3 3 1 6 + 9 6 . 6 8 2 +0 0 .0 0 3 + 0 0 . 0 0 4 +0 0 .0 0 5 +0 0 .0 0 6 +0 0 .0 0 7+00.00 8 +0 0 .0 0 9 +0 0 .0 0 1 0 +0 0 .0 0 11+00.00 1 2 +0 0 .0 0 1 3 +0 0 .0 0 1 4 +0 0 .0 0 1 5 +0 0 .0 0 1 6 +0 0 .0 0 1 7 + 0 0. 0 0 17 +40.10 1 +5 0 .0 0 2 + 5 0 . 0 0 3 +5 0 .0 0 4 +5 0 .0 0 5 + 5 0 . 0 0 6+50.00 7 +5 0 .0 0 8 +5 0 .0 0 9 +5 0 .0 0 1 0 + 5 0 . 0 0 1 1 +5 0 .0 0 1 2 +5 0 .0 0 1 3 +5 0 .0 0 1 4 +5 0 .0 0 1 5 +5 0 .0 0 1 6 +5 0 .0 0 CONCRETE GRADE CONTROL STRUCTURE CREEK BANK UNDERCUT IN THIS AREA EXISTING CONCRETE APRON EXISTING DUAL STORM DRAIN OUTFALL EXISTING 12 ft DIAMETER CMP STORM DRAIN (466.23') INV PROPOSED TRAIL PROPOSED TRAIL PROPOSED CROSSING CREEK BANK UNDERCUT IN THIS AREA EXPLANATION 0 FEET 50 HEC-RAS EXISTING CONDITIONS DIABLO ROAD PEDESTRIAN TRAIL DANVILLE, CALIFORNIA 8870.000.011 AS SHOWN 2 CREEK FLOWLINE HEC-RAS CROSS SECTION 100-YR W.S.E. - EXISTING CONDITION Cross Section Station W.S.E. (ft) Average Velocity (ft/s) 16+96.68 472.9 4.4 16+71.33 472.5 6.5 16+58.48 472.5 6.1 16+17.72 472.5 5 15+90.84 472.5 4.8 15+43.25 472.5 4.6 15+4.01 472.4 4.8 14+83.29 472.2 5.4 14+52.05 472.3 4.6 14+20.04 471.3 8.3 13+63.88 471.2 6.9 13+01.67 471 5.6 12+38.03 470.6 6.2 11+89.74 470.7 5.0 11+29.75 470.7 9.3* 10+87.61 470.6 3.6 10+23.92 470.3 5.4 9+78.46 467.9 12.2 9+40.29 465.1 15.5 8+97.45 466.9 24.7* 8+58.34 465.4 10.4 8+17.54 464.5 11.2 7+41.81 465.3 4.7 6+80.92 465.1 5.1 6+40.35 465.1 4.5 6+02.82 464.8 5.9 5+29.96 464.7 4.4 4+37.14 464.7 3.5 3+43.83 464.7 2.6 1+99.59 464.6 2.6 1+08.35 464.5 3.6 Existing Conditions HEC-RAS Results *VELOCITIES ADJUSTED TO ACCOUNT FOR OUTER BEND IN CHANNEL DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 8870.000.011 May 25, 2022 APPENDIX A Log of Borings DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 Same as above. SILTY CLAY (CL), very dark gray, stiff, trace fine gravel. SILTY CLAY (CL), very dark brown, very stiff, moist, somefine sand, trace fine gravel. De p t h i n M e t e r s Few carbonates. 21 SANDY CLAY (CL), brown, very stiff, very moist, fine tocoarse sand, trace fine gravel, few carbonates. LO G - G E O T E C H N I C A L 8 8 8 9 G I N T L O G S . G P J E N G E O I N C . G D T 1 2 / 1 3 / 1 0 Bottom of boring at 30.5 feet, groundwater encountered at 23feet. Becomes dark brown, trace coarse gravel. 97.7 4.5* 4.5* 4* 2.5* 2.5* 101.6 32 18.7 23.4 27.2 25 37 32 21 Becomes stiff to very stiff. 107.6 J. White / PJS West Coast Exploration Solid Flight Auger 140 lb. Rope and Cathead Mo i s t u r e C o n t e n t (% d r y w e i g h t ) CLAYEY SAND (SC), dark bluish gray and brown, mediumdense, very moist, some roots, some carbonates. Wa t e r L e v e l Fi n e s C o n t e n t (% p a s s i n g # 2 0 0 s i e v e ) Dr y U n i t W e i g h t (p c f ) Atterberg Limits Pl a s t i c i t y I n d e x Geotechnical ExplorationMagee RanchesDanville, California8889.000.000 Pl a s t i c L i m i t Li q u i d L i m i t DATE DRILLED: HOLE DEPTH: HOLE DIAMETER: SURF ELEV (msl): Lo g S y m b o l 9/22/2010 Approx. 30½ ft. 4.0 in. Approx. 467 ft. DESCRIPTION 1 2 3 4 5 6 7 8 9 De p t h i n F e e t 10 20 30 Bl o w C o u n t / F o o t Sa m p l e T y p e LOG OF BORING B-5 LOGGED / REVIEWED BY: DRILLING CONTRACTOR: DRILLING METHOD: HAMMER TYPE: Un c o n f i n e d S t r e n g t h (t s f ) * f i e l d a p p r o x DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 8870.000.011 May 25, 2022 APPENDIX B HEC-RAS Output DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 HEC-RAS Plan: Plan_01 River: GVTRAIL Reach: GVTRAIL Profile: PF 1 Reach River Sta Profile Q Total Min Ch El W.S. Elev Crit W.S. E.G. Elev E.G. Slope Vel Chnl Flow Area Top Width Froude # Chl (cfs) (ft) (ft) (ft) (ft) (ft/ft) (ft/s) (sq ft) (ft) GVTRAIL 1696.68 PF 1 1879.00 460.00 472.93 465.78 473.22 0.001166 4.35 431.64 43.74 0.24 GVTRAIL 1671.33 PF 1 1879.00 460.00 472.47 473.14 0.003812 6.54 287.11 38.93 0.42 GVTRAIL 1658.48 PF 1 1879.00 460.00 472.49 473.06 0.003044 6.08 309.18 41.68 0.39 GVTRAIL 1617.72 PF 1 1879.00 460.00 472.53 472.91 0.001777 4.96 378.85 48.08 0.31 GVTRAIL 1590.84 PF 1 1879.00 460.00 472.51 472.86 0.001502 4.78 397.99 51.65 0.29 GVTRAIL 1543.25 PF 1 1879.00 460.00 472.46 472.78 0.001406 4.57 410.78 45.22 0.27 GVTRAIL 1514.01 PF 1 1879.00 459.95 472.39 472.74 0.001580 4.75 395.41 46.26 0.29 GVTRAIL 1483.29 PF 1 1879.00 459.90 472.21 472.67 0.002233 5.41 347.21 42.11 0.33 GVTRAIL 1452.05 PF 1 1879.00 459.87 472.25 472.57 0.001491 4.57 411.23 50.38 0.28 GVTRAIL 1420.04 PF 1 1879.00 459.85 471.33 472.41 0.007916 8.32 225.83 37.09 0.59 GVTRAIL 1363.88 PF 1 1879.00 459.80 471.24 471.98 0.004437 6.88 273.06 40.40 0.47 GVTRAIL 1301.67 PF 1 1879.00 459.75 470.99 471.47 0.002791 5.58 337.02 50.37 0.38 GVTRAIL 1238.03 PF 1 1879.00 459.70 470.64 471.25 0.004052 6.22 302.08 49.41 0.44 GVTRAIL 1189.74 PF 1 1879.00 459.65 470.65 471.04 0.002343 5.02 374.44 58.92 0.35 GVTRAIL 1129.75 PF 1 1879.00 459.60 470.71 470.88 0.000984 3.33 564.88 94.22 0.24 GVTRAIL 1087.61 PF 1 1879.00 459.55 470.64 470.84 0.001028 3.61 532.44 104.11 0.25 GVTRAIL 1023.92 PF 1 1879.00 459.35 470.25 470.71 0.003157 5.43 356.89 115.28 0.41 GVTRAIL 978.46 PF 1 1879.00 459.25 467.91 467.91 470.22 0.022181 12.20 154.00 33.38 1.00 GVTRAIL 940.29 PF 1 1879.00 459.00 465.14 466.29 468.85 0.051344 15.46 121.53 37.22 1.51 GVTRAIL 897.45 PF 1 1879.00 458.80 466.90 464.95 467.55 0.005328 6.45 291.46 62.59 0.53 GVTRAIL 858.34 PF 1 1879.00 458.00 465.43 467.12 0.014677 10.41 180.51 38.24 0.84 GVTRAIL 817.54 PF 1 1879.00 457.10 464.49 464.29 466.43 0.018208 11.16 168.30 38.66 0.94 GVTRAIL 741.81 PF 1 1879.00 453.91 465.30 465.64 0.001782 4.65 404.36 58.61 0.31 GVTRAIL 680.92 PF 1 1879.00 452.80 465.11 465.51 0.002184 5.08 370.72 56.18 0.34 GVTRAIL 640.35 PF 1 1879.00 452.70 465.08 465.40 0.001857 4.54 413.77 66.59 0.32 GVTRAIL 602.82 PF 1 1879.00 452.58 464.75 465.28 0.004121 5.86 321.66 69.59 0.46 GVTRAIL 529.96 PF 1 1879.00 452.50 464.74 465.04 0.001549 4.40 439.31 90.17 0.30 GVTRAIL 437.14 PF 1 1879.00 452.40 464.69 464.88 0.001237 3.49 548.96 134.20 0.26 GVTRAIL 343.83 PF 1 1879.00 452.30 464.68 464.78 0.000536 2.62 761.67 138.87 0.18 GVTRAIL 199.59 PF 1 1879.00 452.25 464.63 464.71 0.000356 2.58 875.79 135.30 0.15 GVTRAIL 108.35 PF 1 1879.00 452.00 464.47 460.29 464.65 0.001001 3.60 571.61 94.50 0.24 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 PR E L I M I N A R Y P L A N S - N O T F O R C O N S T R U C T I O N TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T TI T L E S H E E T SC A L E : 1" = 1 0 ' FE E T 01 0 2 0 4 0 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T (P H A S E # 2 ) PR O J E C T V I C I N I T Y M A P NO T T O S C A L E PRO J E C T L I M I T S (; + , % , 7 Fa i r w a y D r i v e t o A l a m e d a D i a b l o ( W e s t S e g m e n t ) PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N EXHIBIT 2 DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N 1 / 3 SC A L E : 1" = 1 0 ' FE E T 01 0 2 0 4 0 PR E L I M I N A R Y P L A N S - N O T F O R C O N S T R U C T I O N PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N 2 / 3 SC A L E : 1" = 1 0 ' FE E T 01 0 2 0 4 0 PR E L I M I N A R Y P L A N S - N O T F O R C O N S T R U C T I O N PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N 3 / 3 SC A L E : 1" = 1 0 ' FE E T 01 0 2 0 4 0 PR E L I M I N A R Y P L A N S - N O T F O R C O N S T R U C T I O N PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T SE C T I O N S SC A L E : 1" = 1 0 ' FE E T 01 0 2 0 4 0 PR E L I M I N A R Y P L A N S - N O T F O R C O N S T R U C T I O N PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DR A F T TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N SC A L E : 1 " = 1 0 0 ' PR O J E C T V I C I N I T Y M A P NO T T O S C A L E PRO J E C T L I M I T S SC A L E : 1" = 5 0 ' 20 0 10 0 50 0 FE E T PL A N NO T T O S C A L E Di a b l o R o a d T r a i l P r o j e c t Al a m e d a D i a b l o t o T a n k A c c e s s R o a d (E a s t S e g m e n t ) PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 DR A F T TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N SC A L E : 1 " = 2 0 ' SC A L E : 1" = 2 0 ' 80 40 20 0 FE E T PR O F I L E 1"= 2 0 ' PL A N 1"= 2 0 ' PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N SC A L E : 1 " = 1 0 0 ' DR A F T PR O F I L E 1"= 2 0 ' PL A N 1"= 2 0 ' SC A L E : 1" = 2 0 ' FE E T 02 0 4 0 8 0 PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N SC A L E : 1 " = 2 0 ' DR A F T PR O F I L E 1"= 2 0 ' PL A N 1"= 2 0 ' SC A L E : 1" = 2 0 ' FE E T 02 0 4 0 8 0 PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 TO W N O F D A N V I L L E DI A B L O R O A D T R A I L P R O J E C T PL A N SC A L E : 1 " = 2 0 ' DR A F T PR O F I L E 1"= 2 0 ' PL A N 1"= 2 0 ' SC A L E : 1" = 2 0 ' FE E T 02 0 4 0 8 0 PR E L I M I N A R Y P L A N S - A L I G N G M E N T A N D E L E V A T I O N NO T F O R C O N S T R U C T I O N DocuSign Envelope ID: 4032D1C2-7882-45DA-9452-9D06616E1192 www.danville.ca.gov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rojects ATTACHMENT B FIGURE 2: Proposed Project Location Diablo Road Trail Diablo R d Diablo R d A v e N u e v a A v e N u e v a Diablo RdDiablo Rd Alameda Dia b l o Alameda Dia b l o Calle Ar r o y o Calle Ar r o y o Cal l e A r r o y o Cal l e A r r o y o Fa i r w a y D r Fa i r w a y D r Project LocationProject Location Source: Nearmap, 2022 ATTACHMENT C Town of Danville Diablo Road Trail Final IS/MND December 2022 Appendix E Response to Public Comments ATTACHMENT D 1-1 1-2 Comment Letter 1 “Small Town Atmosphere Outstanding Quality of Life” East Bay Municipal Utility District David J. Rehnstrom November 3, 2022 Comment Letter 1 Response 1-1 The commenter provides general introductory information. The Town of Danville appreciates and values these comments during the IS/MND participation process. Responses to specific comments are provided below; no further response is required. Response 1-2 As requested, the Town will coordinate any construction activity within the EBBMUD right-of-way; no further response is required. 1 Schooner, Casey From:Schooner, Casey Sent:Tuesday, December 6, 2022 11:51 AM To:Schooner, Casey Subject:FW: Notice of a Public Review and Intent to Adopt Mitigated Negative Declaration of Environmental Significance From: Anesia Canty <Anesia.Canty@pw.cccounty.us> Sent: Thursday, November 17, 2022 5:42 PM To: David Crompton <DCrompton@danville.ca.gov> Cc: Crystal Rosewicz <crosewicz@danville.ca.gov>; Jorge Hernandez <jorge.hernandez@pw.cccounty.us>; Gus Amirzehni <Gus.Amirzehni@pw.cccounty.us> Subject: RE: Notice of a Public Review and Intent to Adopt Mitigated Negative Declaration of Environmental Significance ***CAUTION*** THIS EMAIL WAS NOT SENT FROM DANVILLE STAFF This email originated from outside of the Town of Danville and was not sent from a Town Staff member! Do not click on links or open attachments unless you recognize the sender and know the content is safe. Hello David, The Contra Costa County Flood Control and Water Conservation District (FC District) has reviewed the Initial Study/Mitigated Negative Declaration (IS/MND) dated September 2022, for the Diablo Road Trail project (Project) located in the Town of Danville (Town). We submit the following comments: 1. The Hydrology and Water Quality section (Section 4.10) of the IS/MND should discuss the drainage inadequacies of the downstream areas of Green Valley Creek, including the downstream areas of San Ramon Creek, and the possible adverse impacts to these areas due to increased runoff from the project site. 2. The C.3 criteria described as “C.3.a.1.(4)(d)” should be corrected to “C.3.b.ii.(4)(d)”. 3. The project is in the San Ramon Creek watershed and is upstream of known inadequate reaches of San Ramon Creek and Green Valley Creek. An option for the Town to mitigate adverse impacts would be to contribute to the Green Valley Creek Mitigation fee of $0.10 per square foot of new impervious surface area created by the project. We appreciate the opportunity to comment on the Diablo Road Trail project in the Town of Danville and welcome continued coordination with the Town. If you have any questions, please contact me at your earliest convenience. Thank you, 2-1 2-2 2-3 Comment Letter 2 2 Anesia Canty | Staff Engineer Contra Costa County Flood Control & Water Conservation District 255 Glacier Drive, Martinez, CA 94553 p: 925.313.2109 | f: 925.313.2333 e: anesia.canty@pw.cccounty.us | cccpublicworks.org Hours: 9/80 ( M-Th 9a–6:30p, F 9a–5:30p, B Fri off) From: Crystal Rosewicz <crosewicz@danville.ca.gov> Sent: Monday, October 3, 2022 10:17 AM To: Henry Hilken <HHilken@baaqmd.gov>; caltrans_d4@dot.ca.gov; john.kopchik@dcd.cccounty.us; Flood Control <fldcontr@pw.cccounty.us>; Catherine Windham <catherine.windham@pw.cccounty.us>; Michelle Cordis <michelle.cordis@pw.cccounty.us>; ccchazmat <ccchazmat@cchealth.org>; Jerryfahy@pw.cccounty.us; jreyes@ccta.net; Russ Leavitt <rleavitt@centralsan.org>; John.Wiggins@cchealth.org; Rehnstrom, David <david.rehnstrom@ebmud.com>; info@ionemiwok.net; Muwekma@muwekma.org; MuwekmaOhloneTribe@gmail.com; canutes@verizon.net; Lam, Kimberly <KLam2@republicservices.com>; Roy Wendel <rwendel@srvfire.ca.gov>; ehirst@srvusd.net; much@sonoma.edu; Northwest Information Center <nwic@sonoma.edu>; ryan_olah@fws.gov; romy.deguzman@usps.gov; rhatch@wiltonrancheria-nsn.gov; cpd@wiltonrancheria-nsn.gov; vlopez@amahmutsun.org; indiancanyon.kanyon@gmail.com; ams@indiancanyon.org Cc: David Crompton <DCrompton@danville.ca.gov> Subject: Notice of a Public Review and Intent to Adopt Mitigated Negative Declaration of Environmental Significance - Diablo Road Trail Project CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender and know the content is safe. Good morning, Attached please find a notice for a public review period and intent to adopt a Mitigated Negative Declaration of Environmental Significance regarding the Diablo Trail project. Copies of the Draft Mitigated Negative Declaration and Initial Study of Environmental Significance that was prepared for the project are available at the Town of Danville offices located at 510 La Gonda Way Danville, CA 94526 and are available on the Town’s website at: https://www.danville.ca.gov/853/Diablo-Road-Trail or https://danvilletowntalks.org/diablo-road-trails-project Regards, Crystal Rosewicz | Office Assistant Development Services Town of Danville | 510 La Gonda Way | Danville, CA 94526 (925) 314-3340 | crosewicz@danville.ca.gov www.danville.ca.gov “Small Town Atmosphere Outstanding Quality of Life” Contra Costa County Flood Control & Water Conservation District Anesia Canty, Staff Engineer November 17, 2022 Comment Letter 2 Response 2-1 As discussed on page 6 and in Section 4.10 of the IS/MND, the trail is designed to direct stormwater to pervious surfaces with no flow directed to San Ramon Creek or Green Valley Creek. Flows would be discharged to adjacent non-erodible permeable areas and no increase of flow is expected towards the existing drainage system; no further response is required. Response 2-2 The C.3 criteria has been revised to reflect C.3.b.ii.(4)(d), on page 69 of the IS/MND; no further response is required. Response 2-3 As discussed on page 6 and in Section 4.10 of the IS/MND, the trail is designed to direct stormwater to pervious surfaces with no flow directed to San Ramon Creek or Green Valley Creek. Flows would be discharged to adjacent non-erodible permeable areas and no increase of flow is expected towards the existing drainage system; no further response is required.