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• Impact 4.0-1 will be reduced to a less-than-significant level, and are hereby <br /> incorporated by reference and described below. <br /> Mitigation Measure 4.0-la: To address nuisance impacts of construction activities <br /> within the EDZ area, all developers of sites within the EDZ area shall ensure that <br /> construction contractors implement the following: <br /> • Signs shall be posted at all construction site entrances to the property upon <br /> commencement of construction, for the purposes of informing all <br /> contractors/subcontractors,their employees, agents, material haulers, and all <br /> other persons at the applicable construction sites, of the basic requirements <br /> 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 proposed Zone. <br /> Mitigation Measure 4.0-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 the <br /> 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 unavoidable, <br /> an exhaust muffler on the compressed air exhaust shall be used; this muffler' <br /> can lower noise levels from the exhaust by up to about 10 dBA. External <br /> jackets on the tools themselves shall be used where feasible; this could <br /> achieve a reduction of 5 dBA. Quieter procedures, such as use of drills <br /> rather than impact tools, shall be used unless deemed not feasible by a <br /> geotechnical investigation. <br /> Site(s)affected: All sites within the proposed Zone. <br /> (Draft SEIR, pp. 4.0-13 to 4.0-14.) <br /> Impact 4.C-7 <br /> Development within the area of the proposed Zone would be exposed to stationary <br /> 21 <br />