HomeMy WebLinkAboutSupplemental - Rincon ConsultantsDecember 13, 2023
Project No. 23-14340
Henry Perezalonso, CPRE
Recreation, Arts & Community Services Director
Town of Danville
(925) 314-3454
Via email: hperezalonso@danville.ca.gov
Rincon Consultants, Inc.
449 151" Street. Suite 303
Oakland, California 94612
aio 834 4455
info@rinconconsultants.com
www.rinconconsultants.com
Subject: Noise Study for the Osage Park Pickleball Project Supplemental Memorandum, Danville,
California
Dear Mr. Perezalonso:
This memorandum provides supplemental information and data to the noise study prepared by Rincon
on September 8, 2023, for the subject project.
Ambient Noise Measurements
To supplement the September 8, 2023 Noise Study, an additional ambient noise measurement was
conducted on Wednesday, December 13, 2023 The short-term noise measurement was conducted
approximately 50 feet northeast of the existing pickleball court while one game was underway. During
the measurements, the sound level meter was equipped with a windscreen during measurements. The
sound level meter used for noise monitoring (Larson Davis SounclTrack LxT) satisfies the American
National Standards Institute (ANSI) standard for Type 1 instrumentation. The sound level meter was set
to "fast" response and "A" weighting (dBA). The meter was field calibrated before and after the
monitoring period. The measurement was at least five feet above the ground and away from reflective
surfaces. The results of ambient noise monitoring indicate that with a fast response, noise from one
pickleball game at a distance of 50 feet is approximately 60.5 dBA Leq. This is approximately 3 dBA higher
than the highest Leq 50 feet from pickleball activity monitored in July 2023 using a slow meter response,
as detailed in the September 8, 2023 report.
Results
A property of sound is that it attenuates, or drops off, as the distance from the noise source increases.
For a point source, such as pickleball courts, sound levels decrease approximately 6 dBA for each
doubling of distance from the source (Caltrans 2013). The project would generate noise at the nearby
sensitive receptors and the attenuation rate is applied to estimate noise levels at the sensitive
receptors. Shielding effects from buildings, terrain, or other barriers are conservatively not factored into
the attenuation calculations for the purposes of this analysis. For the purposes of this analysis and based
on information from the Town, the pickleball courts operate between the hours of 7:30 a.m. to 9:00
p.m. on weekdays and from 8:00 a.m. to 9:00 p.m. on weekends.
riftcan
Town of Danville
Osage Park Pickleball Noise Study Supplemental
Recreational noise would continue to consist of noise from tennis and/or pickleball being played as
under existing conditions, including noise from the ball hitting a racquet, noise from the ball bouncing
off the court, noise from the ball hitting the chain link fence, and noise from players and spectators
talking. During the additional ambient noise measurement, a single game of pickleball generates noise
levels of up to 60.5 dBA Leq at a distance of approximately 50 feet. A worst-case scenario was modeled
assuming that all pickleball courts and tennis courts were being used simultaneously (and that tennis
courts could conservatively generate noise levels as high as pickleball). The estimated hourly Leq value at
the property line is then converted to an Ldp value assuming a worst-case scenario of all courts in
operation between the hours of 7:30 a.m. to 9:00 p.m. The results of modeling indicate that project
operational recreational noise levels for all eight pickleball and tennis courts operating simultaneously
would result in a noise level of up to 55 Ldp at the closest residential property line to the south and up to
57 Ldr, at the closest residential property line to the west. This would be below the threshold of 60 Ld„
per Town of Danville General Plan Policy 27.09. Therefore, project operational noise impacts would be
less than significant, and no mitigation would be required.
This concludes our operational noise impact assessment of the proposed project. Do not hesitate to
contact me if you have questions about this environmental noise impact assessment or its findings.
Sincerely,
RINCON CONSULTANTS, INC.
Josh Carman, INCE-USA
Director
Page 2