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P-9 Follow-up tests of asphalt plant and Portland cement concrete plants should be conducted to determine whether those sources, while operating independently or concurrently, would cause noise levels to exceed the project objectives during either daytime or nighttime hours. If it is determined from those test that the objectives would be exceeded, source specific noise control measures such as partial or complete enclosures, suspended curtains, lining of chutes and hoppers with sound damping materials, etc., should be specified to reduce the noise to acceptable levels. Mining Area Noise Sources As indicated in Table 2, mining area equipment is predicted to satisfy the daytime noise level objectives at all residences in the immediate project vicinity following construction of proposed berming, with the exception of receiver E1. However, mining noise could exceed the nighttime criteria if excavation occurs prior to 7 am. The following measures should therefore be .. implemented to mining area noise sources to ensure satisfaction with both the daytime and nighttime noise levels objectives at all of the nearby residences, and fully mitigate noise impacts at those locations: M-1 Excavation activities should be limited to the hours of 7 am to 7 pm. M-2 Mobile excavation equipment should be shut off when not in use to minimize idling noise. M-3 The proposed earthen berms should be constructed prior to commencement of mining activities within 1,000 feet of an existing residence. M-4 At receiver E-1, the Table 2 data indicate that the 50 dB Leq daytime standard could be exceeded even with construction of the proposed earthern berm at that location. As a _ result, excavation should not encroach within 500 feet of the project site boundary until noise testing can be conducted to verify that mining activity could occur closer to this residence without causing exceedance of the 50 dB Leq daytime standard. Page -7-