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INTRODUCTION Bollard Acoustical Consultants, Inc. (BAC)has been retained by Resource Design Technology, Inc. to assist in the development of a Noise Control Plan (NCP) for the DeSilva Gates Quarry Project (Project), in San Joaquin County, California. The purpose of this plan is to develop specific strategies for mitigating noise impacts of the project to a less than significant level at the nearest noise-sensitive land uses (residences) to the project site. This NCP utilizes information contained within the Administrative Draft Environmental Impact Report (ADEIR) prepared for this project by Jones & Stokes, Inc., with supplemental analysis by BAC and guidance from San Joaquin County. BACKGROUND The ADEIR noise section prepared for this project contains 3 distinct impact statements. The first and third impact statements (N-1 and N-3), pertain to noise impacts associated with project construction and reclamation, and off-site traffic. These impacts were found to be less than significant with mitigation incorporated, and less than significant without requiring mitigation, respectively. As a result, these impact statements are not the focus of this noise control plan. The second (N-2), pertains to noise impacts associated with ongoing mining and processing activities, and was found to be significant even with mitigation (significant and unavoidable). It is this impact that was subject to additional analysis in an effort to develop this noise control plan which could be implemented to reduce this impact to a less than significant level. As a result, the following sections specifically address noise impacts associated with mining and processing. ADDITIONAL ANALYSIS Standards of Significance _ The ADEIR utilizes the standards contained in Table 3.J-3 (County Code Maximum Allowable Outdoor Noise Exposure for Stationary Sources) for the assessment of project noise impacts associated with mining and processing activities. Specifically, the standards consist of average noise levels of 50 dB Leq during daytime hours, and 45 dB Leq during nighttime hours, at potentially affected noise-sensitive uses (residences). Based on the results of the ambient noise monitoring program reported the ADEIR, it appears that these standards would be appropriate for the nearest residences to the project site on the South _ Side of Highway 132, as ambient noise conditions at these locations appearto be below the County Code standards. Page -1-