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contractors/subcontractors,their employees, agents, material haulers, and <br /> all other persons at the applicable construction sites, of the basic <br /> requirements of Mitigation Measures 4.0-la and 4.0-lb. <br /> • Signs shall be posted at the construction sites that include permitted <br /> construction days and hours, a day and evening contact number for the job <br /> site, and a contact number in the event of problems. <br /> • An onsite complaint and enforcement manager shall respond to and track <br /> complaints and questions related to noise. <br /> Site(s) affected: All sites within the Project. <br /> Mitigation Measure 4.C-lb: To reduce daytime noise impacts due to construction <br /> within the EDZ area, all project developers shall require construction contractors <br /> working within 55 feet of the construction site property boundary to implement <br /> the following measures: <br /> • Equipment and trucks used for construction shall use the best available <br /> noise control techniques (e.g., improved mufflers, equipment redesign,use <br /> of intake silencers, ducts, engine enclosures, and acoustically-attenuating <br /> shields or shrouds). <br /> • Impact tools (e.g.,jack hammers, pavement breakers, and rock drills) used <br /> for construction shall be hydraulically or electrically powered where <br /> feasible to avoid noise associated with compressed air exhaust from <br /> pneumatically powered tools. Where use of pneumatic tools is <br /> unavoidable, an exhaust muffler on the compressed air exhaust shall be <br /> used; this muffler can lower noise levels from the exhaust by up to about <br /> 10 dBA. External jackets on the tools themselves shall be used where <br /> feasible;this could achieve a reduction of 5 dBA. Quieter procedures, <br /> such as use of drills rather than impact tools, shall be used unless deemed <br /> not feasible by a geotechnical investigation. <br /> Site(s)affected: All sites within the Project. <br /> (Draft SEIR, pp. 4.0-13 to 4.0-14.) <br /> Impact 4.C-7 <br /> Development within the area of the Project would be exposed to stationary (non- <br /> transportation) noise sources at levels in excess of the City of Pleasanton Noise Standards. <br /> The Revised Final SEIR evaluates the impact of the Project related to the exposure to <br /> stationary (non-transportation)noise sources that would exceed the applicable City of Pleasanton <br /> Noise Standards. <br /> Significance Before Mitigation: Significant <br />