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05/08/2017 established standard. The attenuating buffers may be removed as soon as the construction noise levels fall under 110 dB at the property boundary. N0I-2: Impact tools (e.g., jackhammers, pavement breakers, and rock drills), if used for project construction, shall be hydraulically or electrically powered wherever possible to avoid noise associated with compressed -air exhaust from pneumatically powered tools. However, where use of pneumatic tools is unavoidable, an exhaust muffler on the compressed -air exhaust shall be used; such mufflers can lower noise levels from the exhaust by up to 10 dBA. External jackets on the tools themselves shall be used where feasible, which could achieve a reduction of 5 dBA. Quieter procedures shall be used, such as drills rather than impact equipment, whenever feasible. N0I-3: Construction activities shall be limited to the hours of 7:00 a.m. and 4:00 p.m., Monday through Friday, which is more restrictive than the noise ordinance requirements. Signs required by the noise ordinance shall reflect the more restrictive construction hour limitation and also include a day and evening contact number for the job site and a day and evening contact number for the City in the event of problems or excessive noise complaints. If the City receives more than 10 noise complaints during one week, the City shall conduct noise measures while construction is occurring to determine the exact level of noise and whether it exceeds the noise ordinance standards. If the noise ordinance standards are being exceeded, the City shall work with the contractor to devise a strategy to bring noise levels into compliance including erection of attenuating buffers as described in NO] -1. Finding: Implementation of Mitigations NO -1, N0I-2 and NO -3 would reduce the prcject- rebted temporary noise during construction to a less than signficant level. Facts in Support of Finding: These mitigation measures are consistent with best management practice to reduce noise impacts during construction. Utilizing property maintained equipment, limiting construction hours and possible use of noise attenuating buffers will reduce the noise impacts associated with construction. Page 9 of 28 ATTY/ RESO.0043/CC RESO HILLSIDE ALTERNATIVE PROJECT RESO. NO. 15582 REV: 05-06-17 PR MUFF NO. 802