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1 MOUNTAIN HOUSE PROPOSFD ALTAMONT 11 EIGHTS TENTATIVE MAP 4. ENVIRONMENTAL CHECKLIST 4.11 NOISE SPIIIEIR Mitigation Measure 4.13=2'requires that commerczalloffice and lmifed Industrial: buildings on the'`east side of the Machado property and in the M'the House Buslr ess Park, be designed to ensure that noise from outdoor equipment does not exceed 55 dBA Lei during daytime hours (7:00 a.m. to 10:00 p.rm.), or 50 dBA Leduring nighttime hours(10:00 p.m. to q 7:00.a'm.) at off-site noise sensitive receptors (i'e.;residences and schools) :Noise'studies shall be conducted to ensure that acceptable noise levels are not exceeded. . With regard to landscape maintenance, SPIIIEIR Mitigation Meas Ire`4:13-2 requires that equipment be equipped with properly operating exhaust mufflers and engine shrouds.and, for maintenance within 320 feet of noise-sensitive land uses(e.g., residences), operation of equipment shall be limited to the hours from 7:00 a.m. to 10:00 p.m. Implementation of the above mitigation measure would reduce new stationary source noise impacts to a less-than-significant level. A soundwalI is planned for the south side of Grant Line Road(EDAW, 2005a, Figure 11-1). In addition, SPIIIEIR Mitigation Measure 4.13-4 requires sound barriers (walls or berms) along seven segments of arterial streets(identified in Table 4.13-11 of the SPIIIEIR) to attenuate traffic noise. One segment is along Central Parkway south of Grant Line Road and another is along Central Parkway at the community park and Delta Community College. f Mitigation Measure 4.13-4 also requires that sound barriers be constructed along the north side of Interstate 205 when acoustical monitoring indicates noise levels from freeway traffic are greater than the applicable noise thresholds at residential neighborhoods, the community park,the community college, and at limited industrial sites. IMitigation Measure 4.13-4 also requires individual projects that do not comply with interior noise standards included in the San Joaquin County Development Title guidelines to use mitigation measures, such as dual-pane windows and exterior wall insulation, to reduce interior noise exposure to 45 dBA Ldr,/CNEL. These features are common for current residential construction in California. Where individual projects do not comply with exterior noise standards of the San Joaquin Development Title, Mitigation Measure 4.13-4 requires that mitigation measures, such as noise barriers and setbacks between noise sources and sensitive receptors,be implemented to reduce exterior noise levels. Implementation of MM 4.13-4 would reduce noise impacts on residents in the proposed project to a less-than-significant levels. DISCUSSION REGARDING PROPOSED PROJECT" a) Exposure of persons to or generation of noise levels in excess of standards established in the local general plan or noise ordinance, or applicable standards of other agencies? 4-56