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In addition, it is important to note that, during several hours in which the Munn & Perkins asphalt plant equipment was not operating, measured ambient noise levels exceeded the County noise level standards at the nearest residences. For example, Appendix B-2 indicates that individual average hourly Leq noise levels measured on September 28"' exceeded the County's nighttime noise level standard during the 10 pm, 11 pm, 2 am, 3 am, and 6 am hours, yet the asphalt plant operating logs for that day clearly indicate that the asphalt plant was shut down during those hours. As noted above, the asphalt plant did operate on that day, but only during the 7 am through 2 pm hours. This is conclusive evidence that local ambient noise sources were responsible for exceedances of County noise standards during the hours in which the plant was not operating, and that exceedances of the County standards when the asphalt plane was operating were caused by local ambient noise sources and not by the Munn & Perkins asphalt plant. Figures 3 through 8 show the logs of asphalt plant usage during the noise survey period. Those figures indicate that the Munn & Perkins Asphalt plant did operate every day during the monitoring period, but that late night and early morning operation of that plant equipment did not occur. The Figure 3-8 data was utilized to identify the hours in which the asphalt plant operated in Appendix B. The hours during which the Rock Plant operated during the noise surveys are also indicated in Appendix B, with that data provided by Munn & Perkins representatives. Ambient Noise Environment at Residences along East River Road There are approximately 22 identified residences located within 350 feet of East River Road between McHenry Avenue to the west and Santa Fe Road to the east. Many of these residences are constructed on actively farmed orchard sites, and primary outdoor activity areas were assumed to be in close proximity to the residences. The closest of these identified residences was scaled from aerial photographs and BAC field surveys to be approximately 60 feet from the centerline of East River Road, Table 6 shows the nearest identified residences and the approximate distances from the centerline of East River Road to the residence. Where the location of the primary outdoor activity area could not be identified it was assumed to be in close proximity to the residence. Environmental Noise Analysis Munn &Perkins Expanded Hours of Operations—San Joaquin County Page 14