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I 4.5 Noise V (c)(3) Noise associated with construction, provided such activities do not take place before r. 6:00 AM or after 9:00 PM on any day, shall be exempt from the noise provisions in Table 4.5-1. ` (d) The Review Authority shall require the preparation of an acoustical study in instances where it has determined that a project may expose existing or proposed noise sensitive land uses to noise levels exceeding the noise standards specified in Table 4.5-1. This determination shall be based on the existing or future 65 dBA DNL contour in the San Joaquin County General Plan,the proximity of new noise-sensitive land uses to known noise sources, or the knowledge that a potential for adverse noise impacts exists. Both the San Joaquin County Noise Element and the San Joaquin Development Title institute a standard of 65 dBA DNL for transportation at residential uses. ` Existing Noise Environment The noise environment surrounding the project site is influenced primarily by agricultural �. operations and truck and automobile traffic on local roadways. In order to characterize the existing noise environment in the project vicinity,two 72-hour noise measurements were conducted in September 2003. Noise measurement results are presented in Table 4.5-2. The locations of the noise measurements are shown on Figure 4.5-2. The long-term noise measurements in Table 4.5-2 show that ambient noise levels in the vicinity of the project site during daytime and nighttime are below 60 dBA LeQ The long-term noise measurement(Measurement A)taken near the residence(R4)on Blewett Road shows that 6. ambient noise levels are about 58 dBA DNL on weekdays and lower on weekends.The long-term noise measurement(Measurement B)taken near the Koster Road bridge shows that ambient noise levels are about 58 dBA DNL on both weekdays and weekends. INN A short-term noise measurement(Measurement C) was taken on August 12,2005, about 3:45 p.m. near the intersection of Koster Road and Gaffery to the southwest of the project site. LeQ noise levels were 40 to 45 dBA and this location can be described as extremely quiet. During the measurement, noise could be heard from traffic on I-5 and also from back-up beepers from the compost facility on Gaffery; however, in both cases, the noise levels were generally less than 42 dBA. High berms along the Delta-Mendota Canal buffered noise from the compost facility to the east. 4.5.2 Impacts and Mitigation Measures Significance Criteria Consistent with the CEQA Guidelines Appendix G, and the professional judgment of the County's staff and consultants, the project would result in a significant impact on the environment if it would: r RMC Pacific Vernalis Quarry Mining and Reclamation Project 4.5-9 ESA/203015 Draft Environmental Impact Report May 2006 r