AgdaPkt 2016-04-25 Closed and Joint SA PFA

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7.B. - Page 94 2 Environmental Analysis The temporary noise from routine construction activity, however,would be within the levels considered normally acceptable at the residential districts on Brewster Avenue and at the Kaiser Permanente facilities. The proposed construction activity and equipment would comply with the City noise ordinance and would not result in prohibited increases in noise levels in residential areas. Once constructed, noise levels from the US 101 undercrossing and Bair Island pump station would be within the levels normally acceptable for the surrounding areas. The replacement pumps would be underground and would typically operate when submerged in the wet well,which would dampen the pump noise. The emergency generator would have a noise enclosure,which would reduce noise levels to 71 dBA at 50 feet. Noise levels at the adjacent commercial uses would be less than 65 dBA. The following measures would reduce noise impacts from project-related construction activities and the emergency generator: Mitigation Measure NOI 1: Construction Scheduling The Contractor shall ensure that noise-generating construction activity is limited to between the hours of 7:30 AM and 4:00 PM,Monday through Friday, and noise levels generated by construction are prohibited on Saturdays, Sundays and holidays. Mitigation Measure NOI 2: Construction Equipment Mufflers and Maintenance The Contractor shall equip all internal combustion engine-driven equipment with intake and exhaust mufflers that are in good condition and designed for the equipment. Mitigation Measure NOI 3: Quiet Equipment Selection The Contractor shall use quiet construction equipment,particularly air compressors,wherever possible. Mitigation Measure NOI 4: Notification of Pile Driving The Contractor shall provide advanced written notification of the schedule for project pile driving activities to homes and businesses on the east side of US 101 within 200 feet of the replacement pump station site. Mitigation Measure NOI 5: Noise Disturbance Coordinator The City shall designate a "noise disturbance coordinator" who would be responsible for responding to any local complaints about construction noise. The disturbance coordinator would determine the cause of the noise complaint (e.g., starting too early,bad muffler, etc.) and institute reasonable measures warranted to correct the problem. The telephone number for the disturbance coordinator shall be posted in a conspicuous location at the construction site. Mitigation Measure NOI 6: Enclosure The Contractor shall select an available sound attenuation enclosure for the emergency generator that would reduce noise levels to 71 dBA at 50 feet. 2-54 US 101 Pedestrian Undercrossing and Bair Island Road Storm Drain Pump Station Project