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Mitigation Measure 4.0-lb: To reduce daytime noise impacts due to construction within the EDZ area, all project developers shall require construction contractors working within 55 feet of the construction site property boundary to implement the following measures: • Equipment and trucks used for construction shall use the best available noise control techniques (e.g., improved mufflers, equipment redesign, use of intake silencers, ducts, engine enclosures, and acoustically-attenuating shields or shrouds). • Impact tools (e.g.,jack hammers, pavement breakers, and rock drills)used for construction shall be hydraulically or electrically powered where feasible to avoid noise associated with compressed air exhaust from pneumatically powered tools. Where use of pneumatic tools is unavoidable, an exhaust muffler on the compressed air exhaust shall be used; this muffler can lower noise levels from the exhaust by up to about 10 dBA. External jackets on the tools themselves shall be used where feasible; this could achieve a reduction of 5 dBA. Quieter procedures, such as use of drills rather than impact tools, shall be used unless deemed not feasible by a geotechnical investigation. Site(s)affected: All sites within the Project. (Draft SEIR, pp. 4.0-13 to 4.0-14.) Impact 4.0-7 Development within the area of the Project would be exposed to stationary (non- transportation) noise sources at levels in excess of the City of Pleasanton Noise Standards. The Revised Final SEIR evaluates the impact of the Project related to the exposure to stationary (non-transportation)noise sources that would exceed the applicable City of Pleasanton Noise Standards. Significance Before Mitigation: Significant Significance After Mitigation: Less than Significant Finding: Changes have been incorporated into the Project that would avoid the significant environmental effect as identified in the Revised Final SEIR. Mitigation Measures 4.0-lc and 4.0-1d, which are incorporated into the Project, will reduce the significant environmental impact to a less than significant level. Facts in Support of Finding: The following facts and mitigation measures indicate that the impact will be reduced to less than significant. 15