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III. ENVIRONMENTAL SETTING,IMPACTS AND MITIGATION MEASURES D. NOISE Location A: Trinity Community Church The first long-term(24-hour or more)noise measurement was taken in the central area of the project site on the northern fenceline of the Trinity Community Church. Data were collected in hourly averages, which were then used to calculate the current ambient DNL. Figures A-1 through A-3 in Appendix A show the fluctuations in these hourly noise levels over the measurement period. As shown in Table III.D-2,noise levels of 65 DNL were recorded at this location on Friday, November 19, 1999. Location B: Near Residences on Temple Street A second long-term noise measurement was collected near the western boundary of the project site. The noise measurement was taken on the project site roughly 25 feet from the site boundary and 75 feet from the closest residence on Temple Street. Noise levels were collected in hourly averages over a four-day period. Figures A-4 through A-8 in Appendix A show the fluctuations in these hourly noise levels over the measurement period. As shown in Table IIID-2, noise levels in the range of 61 to 66 DNL were recorded at this location. Table III13-2 suggests that noise levels are typically lower over weekends than on weekdays. Location C: Segment of Fresno Avenue Between Charter Way and Eighth Street The first short-term (15-minute) measurement was taken on Fresno Avenue between Charter Way and Eighth Street, near some existing single-family residences, at roughly 60 feet from the roadway edge. The measurement was taken on Tuesday,November 23, 1999 between 7:01 and 7:16 a.m. Figure III13-2 shows the noise measurement location. Based on the measured data,the a.m. peak-hour noise level at this location is approximately 62 Leq. Location D: Segment of Navy Drive Between Josephine Street and Pershing Avenue The second short-term measurement was taken on the opposite side of Navy Drive from residences between Josephine Street and Pershing Avenue,at roughly 60 feet from the roadway edge. The measurement was taken on Tuesday,November 23, 1999 between 7:25 and 7:40 a.m. Figure III.D-2 shows the noise measurement location. Based on the measured data,the a.m. peak-hour noise level at this location is approximately 63 Leq. IMPACTS AND MITIGATION MEASURES SIGNIFICANCE CRITERIA A project would normally result in a significant noise impact if it would: • Expose persons to or generate noise levels in excess of standards established in the local general 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; or Stockton Scavenger Transfer Station Expansion III.D.7 ESA/990190