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NOISE(SECTION 4.7) Significant Impact Impact 4.7-1: Project construction would result in temporary short-term noise increases due to the operation of heavy equipment and expose people to noise levels in excess of standards established by the City of Pleasanton Noise Ordinance. Finding Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential construction- related noise impacts to a less-than-significant level: Mitigation Measure 4.7-1: Project contractors will be required to comply with Pleasanton Municipal Code (Section 9.04.100), which would restrict noise generation by construction to the hours of 8:00 a.m. and 8:00 p.m. on Mondays through Saturdays. All construction equipment shall generate noise levels no greater than 83 dBA (Leq) at 25 feet. Feasible noise controls that could be implemented to reduce equipment noise levels include the following: ® Implement best available noise control techniques such as mufflers, intake silencers, ducts, engine enclosures, acoustically attenuating shields or shrouds. ▪ Equipment used for project construction shall be hydraulically- or electrically-powered impact tools (e.g., jackhammers, pavement breakers, and rock drills) wherever possible to avoid noise associated with compressed air exhaust from pneumatically-powered tools. However, where use of pneumatically powered tools is unavoidable, an exhaust muffler on the compressed air exhaust shall be used; this muffler should lower noise levels from the exhaust by up to about 10 dBA. External jackets on the tools themselves shall be used where feasible, and this should achieve a reduction of 5 dBA. Quieter procedures such as drilling rather than impact equipment shall be used whenever feasible. ei Stationary noise sources shall be located as far from residential receptors as possible. If they must be located near residential receptors, they should be adequately muffled and enclosed within temporary' sheds. ▪ Limit continuous operation of heavy equipment near sensitive receptors. • The name and phone number of the designated project liaison shall be posted at the project site boundary so that the public can contact the liaison if noise disturbance occurs. This liaison shall immediately take steps to resolve any complaints received, including modifying construction practices as necessary'to address the noise complaint. Significant Impact Impact 4.7-2: Project construction would increase construction-related traffic on local streets for the duration of project construction. Finding Changes or alterations have been required in, or incorporated into, the project which mitigate or avoid the significant effects on the environment. Facts in Support of Finding The City of Pleasanton has adopted the following measures which will reduce potential construction period traffic noise impacts to a less-than-significant level: LUND RANCH II(PUD-25)RESIDENTIAL PROJECT 15 FINDINGS