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CRITERIA FOR ACCEPTABLE NOISE EXPOSURE San Joaquin County Planning Department Staff have indicated that the focus of this assessment should be on ascertaining compliance with the County General Plan Noise Element standards applicable to residential land uses in the immediate project vicinity. In light of recent court rulings and other CEQA considerations, this analysis also assesses project impacts relative to changes in ambient conditions present without the project and against reasonable criteria for single-event noise exposure at residential uses. As a result, this analysis is presented in two segments; the first dealing specifically with compliance with San Joaquin County standards and the second addressing pertinent CEQA sleep disturbance, and Single-Event Issues. San Joaquin County Noise Standards The San Joaquin County Development Title (Section 9-1025.9) establishes acceptable noise level limits for residential uses affected by both transportation and non-transportation noise sources. For stationary noise sources (such as activities occurring within the Munn & Perkins plant site), the County's maximum allowable noise level (LE,,,) is 70 dB during daytime hours (7 �• a.m. to 10 p.m.) and 65 dB during nighttime hours (10 p.m. to 7 a.m.) at outdoor activity areas of residential land uses. The County also applies an hourly equivalent sound level (Le,,) of 50 dB during daytime hours (7 a.m. to 10 p.m.) and 45 dB during nighttime hours (10 p.m. to 7 a.m.) to outdoor activity areas of residential land uses. For transportation noise sources, such as project traffic on public roadways, the County applies exterior and interior noise level standards of 65 dB Ldn and 45 dB Ldn, respectively, to the outdoor activity areas of residential land uses. The County's noise standards for transportation and non-transportation noise level standards are summarized in Table 3. Table 3 San Joaquin County Noise Level Standards for Residential Uses Noise Source Type Time of Day Descriptor Standard, d8A Transportation Sources 24-hour Standard Ldn 65 (Trucks on East River Road) Stationary Sources 7 am— 10 pm Leq 50 (Asphalt plant operations) Lmax 70 10 pm — 7 am Leq 45 Lmax 65 Source: San Joaquin County General Plan Noise Element Environmental Noise Analysis Munn &Perkins Expanded Hours of Operations—San Joaquin County Page 7