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Home My WebLink AboutASRDRB20201015 5.1 DESIGN REVIEW BOARD STAFF REPORT 5.1 TO: Design Review Board Members October 15, 2020 SUBJECT: Review and recommend approval of Development Plan request DEV20- 0010 to allow the construction of a new 4,618 +/- square foot home with a 419 square foot attached Accessory Dwelling Unit and a 523 square foot garage. The site is located within a Town-identified Scenic Hillside area at 2460 Tassajara Lane PROJECT DESCRIPTION/BACKGROUND Scenic Hillside Development Plans require review by the Design Review Board (DRB). After recommendation for approval by the DRB, the Town mails an Appealable Action Letter to surrounding property owners within 350 feet of the property. If an appeal is not received within 10 days, the approval becomes final. EVALUATION •The north and east building elevations feature two-story walls with little relief. Additional architectural articulation should be considered to reduce the boxy appearance of those elevations. •Several additional screen trees should be added to the downhill and side elevations. Landscaping plans for the front yard area is needed. •The proposed stucco wall paint color is Limestone, which appears to be too white. A darker tan color should be considered. RECOMMENDATION Review and recommend approval of Development Plan request DEV20-0010 to allow the construction of a new 4,618 +/- square foot home with a 419 square foot attached Accessory Dwelling Unit and a 523 square foot garage. Prepared by: David Crompton Chief of Planning 2460 Tassajara Lane 2 October 15, 2020 Attachments: A - Project Plans B - Paint Colors ATTACHMENT A GRADING AND DRAINAGE PLAN COVER SHEET DESCRIPTION FF. CE-2 SHT # CE-1 INV. P. GR. FINISHED FLOOR SHEET INDEX EARTH SWALE INVERT PAVEMENT GRATE TW.TOP OF WALL BW.BOTTOM OF WALL FG.FINISH GRADE CE-3 EROSION CONTROL PLAN TC. FL. TOP OF CURB FLOW LINE SAWCUT DETAIL N.T.S. ALL COMPACTED FINISHED GRADES SHOULD BE SLOPED AT A MINIMUM OF 5% FROM THE EXTERIOR FOUNDATION FOR A DISTANCE OF 5 FEET MINIMUM. WATER SHOULD NOT BE ALLOWED TO COLLECT NEAR THE SURFACE OF THE FOUNDATION OF FLOOR SLAB AREAS OF THE STRUCTURE. 11. UNLESS SHOWN OTHERWISE, ALL CUT AND FILL SLOPES SHALL BE GRADED NO STEEPER THAN 2 FEET HORIZONTALLY TO 1 FOOT VERTICALLY. DOWN SPOUTS TO BE DISCHARGED TO LANDSCAPED AREAS ~ NOT INTO UNDERGROUND STORM SYSTEMS. THE CONTRACTOR AND SUBCONTRACTORS TO FIT ALL INTERNAL COMBUSTION ENGINES WITH MUFFLERS WHICH ARE IN GOOD CONDITION, AND TO LOCATE STATIONARY NOISE - GENERATING EQUIPMENT AS FAR AWAY FROM EXISTING RESIDENCES AS FEASIBLE. IF THERE ARE ANY EXISTING WATER WELLS ON THIS PROPERTY, CONTRACTOR IS TO CONTACT THE COUNTY DEPARTMENT OF HEALTH SERVICES, ENVIRONMENTAL HEALTH DIVISION, PRIOR TO ANY GRADING IN THE IMMEDIATE VICINITY OF THESE WELLS. IT SHALL BE THE CONTRACTOR'S RESPONSIBILITY TO NOTIFY THE ENGINEER OF ANY FIELD CONFLICTS AND TO PROCEED AS DIRECTED BY THE ENGINEER. CONTRACTOR SHALL BE RESPONSIBLE FOR REPAIRING OR REPLACING ANY EXISTING IMPROVEMENTS WHICH ARE TO REMAIN, SUCH AS PAVEMENT, CURB, GUTTER, AND SIDEWALK DAMAGED BY HIM, HIS SUBCONTRACTORS, OR MATERIAL SUPPLIERS. THE CONTRACTOR SHALL KEEP ADJOINING PUBLIC STREETS FREE AND CLEAN OF PROJECT DIRT, MUD, MATERIALS AND DEBRIS DURING THE CONSTRUCTION PERIOD. STOCKPILES OF DEBRIS, SOIL, SAND OR OTHER MATERIALS THAT CAN BE BLOWN BY THE WIND SHALL BE COVERED. A WATERING PROGRAM WHICH INCORPORATES THE USE OF A DUST SUPPRESSANT, AND WHICH COMPLIES WITH REGULATION 2 OF THE BAY AREA AIR QUALITY MANAGEMENT DISTRICT SHALL BE ESTABLISHED AND IMPLEMENTED FOR ALL ON AND OFF - SITE CONSTRUCTION ACTIVITIES. EQUIPMENT AND HUMAN RESOURCES FOR WATERING ALL EXPOSED OR DISTURBED SOIL SURFACES SHALL BE SUPPLIED ON WEEKENDS AND HOLIDAYS AS WELL AS WORK DAYS. DUST-PRODUCING ACTIVITIES SHALL BE DISCONTINUED DURING HIGH WIND PERIODS. CONTRACTOR TO MAINTAIN 8" VERTICAL SEPARATION BETWEEN WOOD FRAMING MEMBERS AND ADJACENT EXPOSED EARTH PER IBC SECTION 2304.11 ALL CUT SLOPES SHALL BE ROUNDED TO MEET EXISTING GRADES AND BLEND WITH SURROUNDING TOPOGRAPHY. ALL GRADED SLOPES SHALL BE PLANTED WITH SUITABLE GROUND COVER. 12. 22. 21. 20. 19. 17. 18. 16. 15. 14. 13. GRADING WORK HOURS ARE 7:30 a.m. TO 5:30 p.m.. MONDAY THRU FRIDAY. NO GRADING WORK WILL BE PERFORMED ON OBSERVED FEDERAL AND STATE HOLIDAYS. 8. IT SHALL BE THE CONTRACTOR'S RESPONSIBILITY TO DISPOSE OF ALL STRIPINGS BY PLACING THEM IN THE STOCKPILES AND EXCHANGING CLEARING, STRIPPING, GRUBBING, AND DEBRIS REMOVAL WITH ON-SITE OR APPROVED IMPROTED FILL AS NECESSARY. THE CONTRACTOR SHALL NOTIFY UNDERGROUND SERVICE ALERT, (800) 642 - 2444, 48 HOURS PRIOR TO ANY EXCAVATION. THE USA AUTHORIZATION NUMBER SHALL BE KEPT AT THE JOB SITE. THE CONTRACTOR SHALL BE RESPONSIBLE FOR THE VERIFICATION OF ALL EXISTING UTILITIES IN THE FIELD. UTILITIES SHOWN ON THE PLANS ARE FOR INFORMATION ONLY AND BASED UPON AVAILABLE DATA. ANY UTILITIES EXPOSED OR DAMAGED BY THE CONTRACTOR SHALL BE REPAIRED BY HIM AT HIS EXPENSE. THE CONTRACTOR SHALL IMMEDIATELY NOTIFY THE ENGINEER OF ANY DIFFERENCES IN LOCATION OF EXISTING UTILITIES FROM THAT SHOWN, OR ANY CONFLICTS WITH THE DESIGN, BEFORE CONTINUING WITH WORK IN THAT AREA. ONCE THE GRADING OPERATION IS UNDERWAY AND IT IS APPARENT THAT STRICT CONFORMANCE TO THE GRADING PLAN WILL NOT RESULT IN A BALANCED CUT AND FILL, THE CONTRACTOR SHALL NOTIFY THE ENGINEER IMMEDIATELY. THE PAD IS TO BE CONSTRUCTED LEVEL FRONT TO REAR AND SIDE TO SIDE WITH A TOLERANCE OF 0.1 FEET. IF ARCHAEOLOGICAL MATERIALS ARE UNCOVERED DURING GRADING, TRENCHING OR OTHER ONSITE EXCAVATION, EARTHWORK WITHIN 400 FEET OF THESE MATERIALS SHALL BE STOPPED UNTIL A PROFESSIONAL ARCHAEOLOGIST WHO IS CERTIFIED BY THE SOCIETY OF CALIFORNIA ARCHAEOLOGY (SCA) AND/OR THE SOCIETY OF PROFESSIONAL ARCHAEOLOGY (SOPA) HAS HAD AN OPPORTUNITY TO EVALUATE THE SIGNIFICANCE OF THE FIND AND SUGGEST APPROPRIATE MITIGATION MEASURES IF THEY ARE DEEMED NECESSARY. SHOULD IT APPEAR THAT THE WORK TO BE DONE OR ANY MATER RELATIVE THERETO IS NOT SUFFICIENTLY DETAILED OR EXPLAINED ON THESE PLANS, THE CONTRACTOR SHALL CONTACT DE BOLT CIVIL ENGINEERING AT 925 / 837 - 3780 FOR SUCH FURTHER EXPLANATIONS AS MAY BE NECESSARY. NO TREES SHALL BE REMOVED UNLESS THEY ARE NOTED TO BE REMOVED ON THE GRADING PLAN. ALL TREES CONFLICTING WITH GRADING, UTILITIES, OR OTHER IMPROVEMENTS, OR WHICH ARE OVERHANGING THE SIDEWALK OR PAVEMENT SO AS TO FORM A NUISANCE OR HAZARD, SHALL BE TRIMMED, TREATED, AND SEALED. THE CONTRACTOR ASSUMES SOLE AND COMPLETE RESPONSIBILITY FOR THE JOB SITE CONDITIONS AT ALL TIMES. THE CONTRACTOR SHALL HOLD THE OWNER AND ENGINEER HARMLESS FROM ANY REAL OR ALLEGED LIABILITIES, EXCEPT THOSE ARISING FROM THE SOLE NEGLIGENCE OF THE OWNER OR ENGINEER. 10. 9. 8. 6. 5. 4. 3. 2. 1. GENERAL NOTES SEE ARCHITECTURAL PLANS FOR DETAILS OF WALKS AND FENCES.24. GRADING SECTION GENERAL NOTES ANY DEVIATION FROM APPROVED PLAN REQUIRES APPROVAL FROM THE TOWN OF DANVILLE GRADING INSPECTOR, PRI0R TO ANY CHANGES OCCURRING IN THE FIELD. CONTRACTOR TO NOTIFY THE TOWN 48-HOURS PRIOR TO START OF WORK. OWNER/ CONTRACTOR NEEDS TO SET UP AN INSPECTION (CODE 600) OFF THE PERMIT CARD. ALL GRADING, SITE PREPARATION, PLACING AND COMPACTION OF FILL TO BE DONE IN ACCORDANCE WITH THE TOWN OF DANVILLE GRADING ORDINANCE; ALSO UNDER THE DIRECT SUPERVISION OF THE SOIL ENGINEER. SUBSEQUENT TO COMPLETION OF THE WORK, THE SOIL ENGINEER SHALL SUBMIT TO THE TOWN BUILDING INSPECTION DEPARTMENT A REPORT STATING THAT ALL WORK HAS BEEN DONE TO ITS SATISFACTION. EROSION AND SEDIMENT CONTROL PLANS REQUIRED FOR WORK DURING RAINY SEASON. (OCTOBER 1 THROUGH APRIL 1) EROSION AND SEDIMENT CONTROL MEASURES ARE TO BE INSTALLED BY OCT. 1. COMPLIANCE TO STORMWATER POLLUTION PREVENTION REGULATIONS IS AT ALL TIMES (YEAR-ROUND). A FINAL REPORT BY THE CIVIL ENGINEER CERTIFYING THAT ALL GRADING, LOT DRAINAGE AND DRAINAGE FACILITIES HAVE BEEN COMPLETED AND THE SLOPE PLANNING INSTALLED IN CONFORMANCE WITH THE APPROVED PLANS, SHALL BE SUBMITTED TO THE TOWN PRIOR TO ISSUANCE OF BUILDING PERMITS. DURING GRADING OPERATIONS, CONTRACTOR SHALL IMPLEMENT DUST CONTROL MEASURES ON SITE AND HAUL ROUTES. ALL SLIDE REPAIR WORK, KEYWAYS, SUBDRAIN INSTALLATION, AND BUTTRESS FILLS WORK SHALL BE INSPECTED BY THE GEOTECHNICAL ENGINEER. CONTRACTOR IS RESPONSIBLE FOR MEASURING AND RECORDING HORIZONTAL AND VERTICAL CONTROL OF KEYWAY AND KEYWAY DRAINAGE SYSTEMS. CONTRACTOR SHALL SUBMIT AS-BUILT DRAWING TO CIVIL ENGINEER. GEOTECHNICAL ENGINEER SHALL PROVIDE VERIFICATION THAT THE WORK WAS DONE IN CONFORMANCE WITH THE GEOTECHNICAL REPORT. REPORT FROM THE SOIL ENGINEER SHALL BE SUBMITTED TO THE GRADING SECTION REGARDING THE SLIDE REPAIR AND/OR SUBDRAIN INSTALLATION, AND A SCALED DRAWING OF THE HORIZONTAL AND VERTICAL LOCATION OF ALL KEYWAY EXCAVATIONS, AND ALL SUB DRAIN IMPROVEMENT INSTALLATION. "BY ACCEPTING THIS PERMIT, THE PERMITEE, FOR HIMSELF, HIS CONTRACTORS, AND EMPLOYEES, PROMISE TO SAVE, INDEMNIFY AND HOLD HARMLESS THE TOWN OF DANVILLE AND ITS EMPLOYEES, AGENTS AND REPRESENTATIVES FROM ALL LIABILITIES AND CLAIMS FOR DAMAGES BY REASON IN INJURY OR DEATH TO ANY PERSON(S), OR DAMAGE TO PROPERTY, FROM ANY CAUSE WHATSOEVER WHILE IN, UPON OR ANY WAY CONNECTED WITH THE WORK COVERED BY THE GRADING PERMIT, AND DOES FURTHER PROMISE TO DEFEND THESE INDEMNITY IN ANY CLAIM OR ACTION ARISING OUT OR AS A RESULT OF WORK DONE UNDER THIS PERMIT". 5. 7. 6. 4. 3. 1. 9. 2. SEE STRUCTURAL PLANS FOR FOOTING EMBEDMENT DEPTH AND DETAILS.23. SHOULD THE CONTRACTOR ENCOUNTER ANY DISCREPANCIES IN THE FIELD OR INTERNAL DISCREPANCIES WITHIN THESE PLANS, THE ENGINEER SHALL BE NOTIFIED FOR CLARIFICATION PRIOR TO THE INSTALLATION OF THE ASSOCIATED IMPROVEMENTS. 7. THE CONTRACTOR/DEVELOPER SHALL DEFEND, INDEMNIFY, AND HOLD HARMLESS THE TOWN OF DANVILLE AND ITS AGENTS, OFFICERS, AND EMPLOYEES FROM ANY CLAIM, ACTION, OR PROCEEDING AGAINST THE TOWN OF DANVILLE OR ITS AGENT, OFFICERS, OR EMPLOYEES, TO THE ATTACK, SET ASIDE, VOID, OR ANNUL, AN APPROVAL OF THE TOWN OF DANVILLE OR ITS ADVISORY AGENCY, APPEAL BOARD, OR LEGISLATIVE BODY CONCERNING A SUBDIVISION, WHICH ACTION IS BROUGHT WITHIN THE TIME PERIOD PROVIDED FOR IN SECTION 66499.37 OF THE GOVERNMENT CODE OF THE STATE OF CALIFORNIA. THE TOWN OF DANVILLE SHALL PROMPTLY NOTIFY THE DEVELOPER OF ANY CLAIM, ACTION OR PROCEEDINGS. 25. EXISTING PUBLIC IMPROVEMENTS THAT ARE DAMAGED BY THE PROJECT CONSTRUCTION SHALL BE REPAIRED OR REPLACED TO THE SATISFACTION OF THE CITY ENGINEER, AT FULL EXPENSE TO THE APPLICANT, EXISTING DAMAGED PUBLIC IMPROVEMENTS WITHIN THE PROJECT LIMITS SHALL BE REPAIRED OR REPLACED EVEN IF THE DAMAGE OCCURED PRIOR TO THE START OF CONSTRUCTION. 25. CE-4 STORM WATER CONTROL PLAN REVISIONS Date: Job No.: By: Scale: #DATE EASTON C McALLISTER - R.C.E. 61148 RENEWAL DATE: 12/31/20 811 SAN RAMON VALLEY BLVD #201 YEARS DANVILLE, CALIFORNIA 94526 (925) 837-3780 | DEBOLTCIVIL.COM 2460 TASSAJARA LANE TOWN OF DANVILLE CONTRA COSTA COUNTY CALIFORNIA 05/15/20 EM 19387 No. 61148 N.T.S. COVER SHEET CE-1 N SITE REVISIONS Dat e: Job No.: By: Scale: #DATE EAST ON C McALLIS TER - R.C.E. 61148 RENEWAL DATE: 12/31/20 811 SAN RAMON VALLEY BLVD #201 YEARS DANVILLE, CALIFORNIA 94526 (925) 837-3780 | DEBOLTCIVIL.COM 2460 TASSAJARA LANE TOWN OF DANVILLE CONTRA COSTA COUNTY CALIFORNIA 06/18/20 EM 19387 No. 61148 1" = 10' CE -2 GRADING AND DRAINAGE PLAN 1 2 NDS MODEL 40 6" IN-LINE CIRCULAR DRAIN INLET 12"x12" STORM DRAIN INLET STRUCTURE. OLDCASTLE OR APPROVED EQUAL. 1)ALL DRY UTILITIES, WATER AND SEWER SERVICES BY OTHERS. 2)SPLASH BLOCK ENERGY DISSPATORS TO BE PROVIDED WHERE ROOF DOWNSPOUTS DISHCARGE DIRECTLY TO LANDSCAPE AREAS. 3)BUILDING SETBACKS TO BE CONFIRMED BY OTHERS. 4)CONTRACTOR SHALL MAINTAIN A MINIMUM VERTICAL SEPARATION OF 8" BETWEEN LOWEST WOOD STRUCTURAL MEMBER AND THE ADJACENT EXTERIOR FINISHED GRADE. 5)PAD GRADES ARE ASSUMED, TO BE CONFIRMED WITH FINAL FOUNDATION DESIGN. REVISIONS Dat e: Job No.: By: Scale: #DATE EAST ON C McALLIS TER - R.C.E. 61148 RENEWAL DATE: 12/31/20 811 SAN RAMON VALLEY BLVD #201 YEARS DANVILLE, CALIFORNIA 94526 (925) 837-3780 | DEBOLTCIVIL.COM 2460 TASSAJARA LANE TOWN OF DANVILLE CONTRA COSTA COUNTY CALIFORNIA 06/18/20 EM 19387 No. 61148 1" = 20' EROSION CONT ROL PLAN CE -3 CONSTRUCTION ENTRANCE DETAIL STABILIZED N.T.S. STOCKPILE SAND BAGS AND STRAW WATTLE CONSTRUCTION ENTRANCE INSTALL STRAW WATTLE FENCING, TYP. STRAW WATTLE / SILT FENCE STRAW WATTLE LEGEND CONSTRUCTION ENTRANCE EROSION CONTROL N OTES ENTRENCHMENT DETAIL IN SL OPE AREA ENTRENCHMENT DETAIL IN FLAT AREAS N.T.S.N.T.S. STRAW WATTLE DETAILS N.T.S. REVISIONS Dat e: Job No.: By: Scale: #DATE EAST ON C McALLIS TER - R.C.E. 61148 RENEWAL DATE: 12/31/20 811 SAN RAMON VALLEY BLVD #201 YEARS DANVILLE, CALIFORNIA 94526 (925) 837-3780 | DEBOLTCIVIL.COM 2460 TASSAJARA LANE TOWN OF DANVILLE CONTRA COSTA COUNTY CALIFORNIA 06/18/20 EM 19387 No. 61148 1" = 20' CE -4 STORM WATER CONTROL PLAN ATTACHMENT B