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4.4 NOISE 2. Acoustical Reports. Development of residential or other noise-sensitive land uses in projected noise impacted areas (greater than 60 Db LJ, shall require an acoustical analysis prepared at the applicant's expense (Planning). 3. Enforcement of State and Federal Noise Regulations. The County shall continue to enforce state and federal noise laws regarding vehicle operation equipment and building insulation (Sheriff, Health, Building Inspection). 4. Building Code. The County shall continue to incorporate the most recent noise standards contained in the Uniform Building Code into its own building code(Building Inspection). 5. Noise Ordinance. The County shall prepare a noise ordinance to address community noise problems (Health). ENVIRONMENTAL IMPACTS AND MITIGATION MEASURES Significance Criteria CEQA Guidelines state that a project normally has a significant adverse noise impact if it results in substantial noise level increases in areas adjacent to the project site. In establishing a significant noise impact, the proposed land uses are also evaluated against noise and land use compatibility guidelines adopted by San Joaquin County. Existing residences in and around the project area could be potentially impacted by traffic associated with the proposed project. The General Plan of San Joaquin County does not contain a quantitative noise criterion that defines the noise level increases that the County would consider significant. Environmental noise level changes above 3 dB are generally noticeable. An increase in noise level of 5 dB is considered clearly detectable and can result in adverse community response. In this EIR an increase of 5 dB in the L, at a sensitive receptor is considered significant. The bottoms of the two ephemeral lakes on the site will be excavated for a period of about five years and trucks will be used to transport excavated material out of the site. The County has not adopted a quantitative noise ordinance to assess and regulate the noise output of excavation related activities. The Office of Noise Control, California Department of Health, has proposed a Model Community Noise Control Ordinance to be used as a guide for communities in California(Office of Noise Control, 1974). The Noise Ordinance proposes exterior noise limits for different land uses in California. The exterior noise limits for rural/suburban land uses are 50 dB during daytime (7:00 a.m. - 10:00 p.m. and 40 dB during nighttime (10:00 PM - 7:00 AM). The noise ordinance limits are not to be exceeded at the receiver's property for a period of time no longer than 30 minutes in any hour of the day. 4.4-5