14 ATTACHMENT 04 - Laserfiche WebLink

9.04.040 Noise Limits — Commercial Property: No person shall produce or allow to be produced by any machine, animal, device, or any combination of the same, on commercial property, a noise level in excess of 70 dBA at any point outside of the property plane, unless otherwise provided in this chapter. 9.04.070 Daytime Exceptions: Any noise which does not produce a noise level exceeding seventy (70) dBA at a distance of twenty five feet (25') under its most noisy condition of use shall be exempt from the provisions of sections 9.04.030, 9.04.040, and subsection 9.04.060A of this chapter between the hours of eight o'clock (8:00) A.M. and eight o'clock (8:00) P.M. daily, except Sundays and holidays, when the exemption herin shall apply between ten o'clock (10:00) A.M. and six o'clock (6:00) P.M. EXISTING NOISE ENVIRONMENT The project site is located in the southeast corner of the intersection at Santa Rita Road and West Las Positas Boulevard. A field investigation was conducted to identify land uses that could be significantly impacted by project-generated noise, which includes carwash operations. Multi- family residences are located west (across Santa Rita Road) and northeast (across West Las Positas Boulevard) of the project site. There are single-family residences to the east of the project site, but these noise-sensitive residences would receive shielding from existing commerciaUretail land uses and a restaurant adjacent to the project site. The commerciaUretail land uses surround the project site to the south and southeast. To the north and across West Las Positas Boulevard is a fire station. Figure 1 shows the project site with the surrounding land uses. The main source of noise in the area is currently traffic from Santa Rita Road and West Las Positas Boulevard. Parking lot traffic from the gas station, automotive service shop, and retail plaza also affect the noise environment at noise-sensitive receptors surrounding the project site on a short, intermittent basis. For this noise assessment, measurements were conducted with Larson Davis Laboratories (LDL) Type I Model 820 Sound Level Meters equipped with V2-inch pre-polarized condenser microphones and windscreens. The meters were calibrated with a Larson Davis Model CA250 precision acoustic calibrator prior to and following the measurement survey. Two long-term noise measurements and two short-term noise measurements were made between Friday, November 22, 2013 to Monday, November 25, 2013 to quantify the existing noise environment on the project site and the surrounding area. The noise measurement locations were selected to represent the noise exposure of the nearest multi-family residences and the adjacent commercial land uses. These locations are also shown in Figure 1. Long-term noise measurement LT-1 was made, on the eastern property line of the Las Positas Gardens Townhomes, which was approximately 325 feet from the exit of the proposed carwash and approximately 30 feet from the centerline of the farthest right lane along Santa Rita Road southbound. The daily trend in noise levels at this long-term noise measurement site is summarized in Figure 2. The weekday hourly average noise levels for LT-1 typically ranged from 66 to 74 dBA Leg during the day and from 56 to 68 dBA Leg at night, with a weekday day- night average noise level of 71 dBA L . On the weekend, the hourly average noise levels typically ranged from 63 to 69 dBA Leg during the day and from 55 to 65 dBA Leq at night, with Page 8