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4. ENVIRONWNTAL ANALYSIS 4.5 NOISE — 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,earth movement,and loading operations. Excavation activities would involve scrapers,dozers,and loaders digging up the earth and loading the material onto trucks for transport to the plant or stockpiles. The entire property would be mined in nine phases over the course of 26 to 60 years. Under the worst case scenario, excavation would occur 24 hours per day,6 days a week(Monday through Saturday)during periods of peak demand. Mining equipment is expected to generate noise levels similar to construction equipment. Table 4.5-3 shows typical construction noise levels that have been measured at a distance of 50 feet from the noisiest source and 200 feet from the rest of the equipment associated with — construction. Noise from excavation operations and earth moving activities for mining operations would be similar to the noise levels for ground clearing and excavation shown in Table 4.5-3, which are 85 dBA and 91 dBA Ley,respectively. Table 4.5-4 shows typical noise levels for individual construction equipment. For the purposes of this EIR, on-site mobile equipment used for mining,including the operation of material haul trucks on-site, is considered a stationary noise source because it would be operated within a fixed area of private land for extended periods of time(26 to 60 years). Therefore, noise levels generated by mining activities are subject to the daytime and nighttime standards for stationary noise sources presented in Table 4.5-1, Part II from the San Joaquin County Development Title. TABLE 4.5-3 TYPICAL CONSTRUCTION ACTIVITY NOISE LEVELS Construction Phase Noise Level(dBA L,)a Ground Clearing 85 Excavation 91 —. Foundation Construction 76 Erection of Structures 85 Finishing 92 a Average noise levels correspond to a distance of 50 feet from the noisiest piece of -- equipment associated with a given phase of construction and 200 feet from the rest of the equipment associated with that phase. SOURCE: U.S.Environmental Protection Agency,Noise from Construction Equipment and Operations,Building Equipment,and Home Appliances,December 1971. RMC Pack Vemalis Qumry Mwng and Reclamation Pmject 4.5-12 PSA/203015 Ad..:of nve Dnft 192 March 2004