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4.Environmental Analysis — Impact Analysis — Impact 4.5.1: Noise generated by mining equipment and excavation activities would result in an increase in the ambient noise levels at the nearest residence(s).This would be a _ potentially significant impact. Mining activities would involve excavation, TABLE 4.5-3 _ earth movement,and loading operations. TYPICAL CONSTRUCTION ACTIVITY NOISE LEVELS Excavation activities would involve scrapers, dozers, and loaders digging up the earth and construction Phase Noise Level(dBA I_J3 loading the material onto trucks for transport to the plant or stockpiles. The entire property Ground Clearing 85 would be mined in nine phases over the course Excavation 91 of 26 to 60 years. Mining equipment is Foundation Construction 76 expected to generate noise levels similar to Erection of Structures 85 construction equipment. Table 4.5-3 shows Finishing 92 — typical construction noise levels that have been Average noise levels correspond to a distance of 50 feet from measured at a distance of 50 feet from the the noisiest piece of equipment associated with a given phase of construction and 200 feet from the rest of the equipment noisiest source and 200 feet from the rest of the associated with that phase. SOURCE: U.S.Environmental Protection Agency,Noise from equipment associated with construction. Noise Construction Equipment and Operations,Building Equipment,and from excavation operations and earth moving Home Appliances,December 1971. activities for mining operations would be similar to the noise levels for ground clearing and excavation shown in Table 4.5-3, which at a distance of 50 feet are 85 dBA and 91 dBA L,q,respectively. When mining is near residences(RI - - R5), these mining operations would be the nearest, loudest activities to each sensitive receptor in the project vicinity, and as discussed below in detail, additional noise from other sources further away would not contribute substantially to the noise levels experienced at the receptors — (see Figures 4.5-3 and 4.5-4). Table 4.5-4 shows typical noise levels for individual construction TABLE 4.5.4 equipment. TYPICAL CONSTRUCTION EQUIPMENT NOISE LEVELS For the purposes of this EIR, on-site mobile Noise Level equipment used for mining, including the Construction Equipment (dBA, Leq at 50 feet) operation of material haul trucks on-site,is Dump Truck 88 Portable Air Compressor 81 considered a stationary noise source because it Concrete Mixer(Truck) 85 would be operated within a fixed area of private Scraper 88 — Dozer 87 land for extended periods of time(26 to Paver 89 60 years). Therefore,noise levels generated by Generator 78 Front Loader 79 — mining activities(except initial stripping is Scraper 88 Grader 85 considered to be a temporary construction Backhoe 85 activity)are subject to the daytime and nighttime _ Standards for stationary ROISe SOUICeS resented SOURCE: CunniH,Environmental Noise Pollution,1977 and P U.S.Environmental Protection Agency,Noise from in Table 4.5-1, Part II from the San Joa uin Construction Equipment and Operations,Building Equipment, q and Home Appliances,1971. County Development Title. _ RMC Pacific Vemalis Quarry Mining and Reclamation Project 4.5-12 ESA/203015 Dreg Environmental Impact Report May 2006