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Munn&Perkins Quarry Excavation Permit Existing Noise Environment The noise environments in areas surrounding the project site are influenced primarily by agricultural- associated operations,truck and automobile traffic on local roadways,and existing project aggregate mining and transportation operations. During nighttime hours when the project facility is not in operation, noise exposure at many locations in the project area is dominated by natural sources (e.g., animals, wind). The primary noise-sensitive receivers affected by the project are located along East River Road(north) and Burwood Road(east).Noise-sensitive, single-family residential receivers are located within 1,000 feet north and 1,900 feet east of the project site. Figure 3.4-1 shows the project vicinity. Ambient Noise Level Measurement Results The following information is provided based on the Environmental Noise Assessment completed by BAC on August 18, 2010. Long-term ambient noise level measurements were completed in the project vicinity near the closest noise-sensitive receivers to the project on September 27, 2010 thru October 2, 2010, Sites A and B represent the closest receivers on Burwood Road while Sites 1-5 represent the closest receivers on East River Road. Table 3.4-2 is a summary of the ambient noise level measurement results. TABLE 3.4-2 SUMMARY OF AMBIENT NOISE LEVEL MEASUREMENTS Average Hourly Noise Level,dB 2,3 Daytime Hours(7 a.m.-10 p.m.) Nighttime Hours(10 p.m.-7 a.m.) Measurement Site (Distance to C.L.)' L q Ln_x Lea Lm Lon,dB A 43-51 62-70 42-46 67-70 49-53 B � 48-56 67-88 ��- 45-47 �- 70-72 52-56 1 (40 feet) 71-73 91-106 65-68 88-95 73-75 2(350 feet) 55-58 75-85 53-56 70-85 60-62 3(50 feet) 67-69 89-99 63-65 84-98 70-72 4(60 feet) 64-67 86-96 59-62 82-86 67-69 5(50 feet) 65-69 85-94 61-64 84-92 69-71 1. Distance from centerline of East River Road to noise level measurement site. 2. Daily noise level averages for September 27,2010 thru October 2,2010. 3. Does not include noise exposure from almond harvesting near Sites A and Bon October 2,2010. SOURCE: Bollard Acoustical Consultants,Inc.,August 18,2010. Since the project represents the addition of asphalt plant and associated operations during the hours of 9 p.m.,to 5 a.m., it is of interest to compare project-related noise exposure to existing ambient noise exposure during these hours.A summary of the measure ambient noise exposure in the project vicinity during the hours of 9 p.m.to 5 a.m. on September 28, 2010 thru October 2, 2010 is presented in Table 3.4-3. Munn&Perkins Quarry Excavation Permit 3.4-10 ESA 1211086 Draft EIR April 2011