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The Table 3 data indicate that,due to the setbacks from the project boundaries to Residences l and 2, early morning / nighttime mining operations are not expected to exceed 45 dB Leq at those residences. However,due to the proximity of Residence 3 to the southeast corner of the site, early morning / nighttime mining activities near that southeast corner could cause exceedance of the recommended 45 dB Leq exterior noise Ievel standard at that location. As a result,additional noise mitigation measures are recommended for such operations. Table 3 indicates that,provided a 600 foot separation of the mining activities is maintained, exterior noise levels of approximately 45 dB Leq can be expected at Residence 3. CONCLUSIONS AND RECOMMENDATIONS This analysis concludes that,with some additional noise control measures,early morning/nighttime mining and processing operations at the DSS quarry site can occur without resulting in significant noise impacts at the nearest residences to this facility. The following specific measures are recommended to ensure compliance with applicable San Joaquin County noise standards and to reduce the potential for adverse public reaction to noise generated during early morning/nighttime mining and processing activities. I. Aggregate stockpiles locations should be maintained at their current positions' as those stockpiles provide partial shielding of processing area noise to the nearest residences to the east and south. 2. Early morning/nighttime mining activities within 600 feet ofany residence should not occur unless that equipment is recessed at least 40 feet within the pit so as to be substantially shielded from that residence. 3. Overburden removal or initial mining activities within 600 feet from existing residences for which the mining equipment is not recessed in the pit should be limited to hours during which operations currently occur. 4. In general,back-up beepers have frequently been cited as a source of annoyance at residential uses due to the tonal content of the beeping. As a result, front-loaders and other equipment which will operate at night should be retrofitted which routinely utilizes back-up beepers with either volume controls(set to the minimum levels required for safety), strobe lights,or radar-based back-up beepers. These conclusions and recommendations are based on the ambient noise level data collected in the project site vicinity for the original DSS quarry EIR,on current noise level data collected by Bollard & Brennan, Inc. at the DSS site, and on standard methodologies for .the prediction of sound propagation over distance. It should be noted that variations in atmospheric conditions (wind, temperature,humidity,etc.) will cause actual noise levels to be higher or lower than those predicted in this analysis. Environmental Noise Evaluation Proposed DSS Quarry Rescheduled Hours of Operation __ Page 6 �'