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San Joaquin County Community Environmental Setting, Impacts,and Mitigation Measures Development Department Noise ti Mitigation Measure N-2: Employ Noise-Reducing Operational Practices The Project Applicant shall employ noise-reducing operational practices such that noise at adjacent residential uses does not exceed San Joaquin County noise standards for residential uses(i.e., 50 dBA/45 dBA daytime/nighttime limit for residences south of SR 132 and 60 dBA/57 dBA for residences north of SR 132). Measures to reduce operational noise include but are not limited to the following: _ 1. Main Processing Plant and Recycle Plant operations(not including load out) shall not occur prior to 7 a.m. or after 7 p.m. 2. When night paving projects will require early morning start-up of the asphalt or concrete plants,hoppers shall be fully loaded the afternoon prior to minimize early morning noise generation. 3. Mobile heavy equipment operating prior to 7 a.m. should befitted with radar or strobe based backup warning devices to be used in lieu of backup beepers. 4. To the extent feasible, aggregate stockpiles should be located on the site to provide maximum screening of processing equipment noise in the directions of the nearest residences. L 5. Mobile equipment should be shut off when not in use to minimize idling noise. 6. Localized noise curtains or acoustic panels shall be suspended between the asphalt burner and nearest receiver north of SR 132. The material should be of sufficient size to block line of sight between the main asphalt plant noise source(burner)and that _. residence. The material should be of sufficient mass to reduce asphalt burner noise by at least 5 dB at that residence. 7. Because asphalt plant noise tends to be directional(i.e. louder in some directions than others even at the same distances),the asphalt plant shall be positioned so as to minimize noise exposure at the nearest receiver north of SR 132. 8. Chutes and hoppers of the main processing plant should be lined with urethane sheets to reduce the impulsive sounds generated by rock falling on metal surfaces at those locations. 9. Follow-up tests of asphalt plant and Portland cement concrete plants shall be conducted to determine whether those sources,while operating independently or concurrently,would cause noise levels to exceed the County noise standards during either daytime or nighttime hours. If it is determined from those test that County noise standards would be exceeded, source specific noise control measures ` such as partial or complete enclosures, suspended curtains, lining of 1 DeSilva Gates Quarry Project Draft Environmental Impact Report 3.J-15 AS 05105.05 V t•