Reso13 PC 13-09 2859 Initial Study Mitigated Negative Declaration Kensington

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At 15 feet, maximum instantaneous noise levels for typical activities would be 60 to 70 dBA and up to 80 dBA for car alarms. When these noise events occur,it would temporarily increase ambient noise levels by 10 to 15 dBA during the day and 20 to 25 dBA at night at a distance of 15 feet which would likely be considered intrusive by nearby sensitive receptors. Wl�ile instantaneous noise events would result in occasional temporary noise levels above residential standards,the hourly average ambient noise level in the project area with the parking lot would be 42 dBA at a distance of 40 feet from the center of the parking area which is well below the residential threshold. In addition, operation of the parking lot would result in CNEL noise levels of 49 dBA at the nearest residences which is also well below the residential threshold. Therefore, operation of the proposed parking lot would not significantly increase ambient noise levels in the project area. The residential facility will have staff on duty 24 hours a day. The number of staff will vary throughout the day depending on resident needs. Based on the operation of comparable facilities,the highest number of staff would be on-site between 6:00 AM and 8:00 PM,peaking between 10:00 AM and 1:00 PM. By 10:00 PM, staffing levels would drop significantly with no additional staff beginning work until 6:OOAM. Employees would not be entering the parking lot to begin a work shift during the most sensitive nighttime hours (10:00 PM to 5:00 AM). Approximately one to two employees will, however,be ending their shift and lea�ing the facility during the late night and early morning hours.26 Due to the infrequent nature of the instantaneous noise events,the operating schedule of the proposed facility, and because the project will not increase the overall ambient noise levels above residential thresholds, construction and operation of the parking lot as proposed would have a less than significant noise impact. (Less Than Significant Impact) Construction Related Noise Construction activities would require the use of heavy equipment during demolition, grading, and construction that would temporarily increase noise levels in the project area. Typical hourly average construction-generated noise levels are about 81 to 88 decibels measured at a distance of 50 feet from the center of the site during busy construction periods. These noise levels drop off at a rate of approximately six decibels per doubling of distance between the noise source and the receptor. Based on the anticipated construction schedule, demolition work will take about 20 days, grading will take about 18 days, and full build-out take approximately eight months. The project site is bordered by residential land uses to the north and west. Because of the small size of the site,hourly average construction-generated noise levels would likely be in the upper range at the nearest residences during the busiest construction periods. Therefore,noise generating activities associated with demolition and construction at the project site would temporarily elevate noise levels in the area surrounding the proj ect site. Impact NOI-2: Construction of the proposed project would expose nearby residents to temporary elevated noise levels. (Significant Impact) 26 personal Communication. Billy Shields—Fountain Square Development West,LLC Kensington Assisted Living Facility Project 71 Initial Study Redwood City Apri12013