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4. ENVIRONMENTAL ANALYSIS 4.5 NOISE 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 sixty-five(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. (f) The outdoor operation of any industrial,commercial, or residential property maintenance tool or equipment powered by an internal combustion engine or electric motor including,but not limited to,leaf blower,chainsaw,lawn mower, hedger,and vacuum cleaner is prohibited within 500 feet of a residence located in a residential zone between the hours of 9:00 PM and 8:00 AM 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 taken near the residence on Blewett Road shows that ambient noise levels are about 58 dBA DNL on weekdays and lower on weekends. The long-term noise measurement taken near the Kloster Road bridge shows that daytime noise levels are about 58 dBA DNL on both %P weekdays and weekends. y 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 proposed project would result in a significant impact on the environment if it would: • Exposure of persons to or generation of noise levels in excess of standards established in any applicable plan or noise ordinance,or applicable standards of other agencies. • Result in a substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project. • Result in a substantial temporary or periodic increase in ambient noise levels in the project vicinity above existing levels existing without the project. RMC Pacific Venvlis QnartY Mining and Reclamation Project 4.5-9 ESA/203015 Administrative Draft©R March 2004