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INTRODUCTION This analysis was prepared to evaluate the potential for noise impacts associated with aggregate mining operations at the Teichert Traina site in San Joaquin County,California. The location of the proposed Traina mining site is shown by Figure 1. CRITERIA FOR ACCEPTABLE NOISE EXPOSURES The San Joaquin County Noise Ordinance, (Chapter 16, Section 9-3800) states that no sound level shall exceed 65 dB Ld, at the property line of properties which abut areas either developed residential, zoned residential, or shown for residential use on the General Plan. The 65 dB Ld, standard would also apply to the property lines of parks, schools, hospitals, and rest homes. For uses which are not particularly noise sensitive, such as C-M, R-M, M-1 AND M-2 zones, the _ sound level shall not exceed 75 dB L. at the property line. BBA site observations revealed that there are no existing noise-sensitive uses (residences) located adjacent to either the north,east or west boundary of the mining site. As a result,the property line noise standard at those locations would be 75 dB L.. Along the southern boundary of the proposed mine site, there are two existing residences. The property line noise standard at those residential locations would be 65 dB Ld,. EVALUATION OF EXISTING NOISE ENVIRONMENT The existing noise environment in the project area is defined primarily by traffic on MacArthur Road, as well as by operations at the existing Teichert aggregate plant and mining sites. Other noise sources in the project vicinity include occasional WPRR operations and aircraft activity at the nearby San Joaquin County Airport. Previous noise level measurement surveys conducted for similar Teichert mining applications in Tracy revealed that the ambient noise environment in the project vicinity consists of average daytime noise levels in the low 50's to mid 60's, depending on the proximity of the receiver to the local roadways, railroad tracks and Teichert Aggregate facility. 1