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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4. ENv112ONMENTAL CHECKLIST 4.11 Nolsr primarily on distance from nearby roadways and shielding of noise by existing structures. Peak or Lma,,noise levels reach between 76 and 81 dBA and are associated with large trucks and agricultural equipment passing by(EDAW, 2005b). I 2 5 SIGNIFICANT IMPACTS IDENTIFIED N 00 SPIIIEIR The SPIIIEIR identified four potentially significant noise impacts and proposed mitigation measures that would make all of them less than significant if implemented. One impact concerns the impact of increased traffic on existing residences along Grant Line Road. The three potentially significant impacts that would affect the proposed project include the following: Impact 4.13-1: Noise–Generation of Temporary Construction Noise. [Implementation of Specific Plan III] could result in construction-related noise between 9:00 a.m. and 6:00 p.m. that could exceed applicable County noise standards at nearby existing and proposed residential land uses. A significant impact could occur. Impact 4.13-2: Noise—Generation of New Stationary-Source Noise. [Implementation of Specific Plan III] would result in new stationary-source noise (specifically, noise from commercial/off ce/industrial uses and Iandscape maintenance) that could exceed applicable County noise standards at existing and proposed nearby noise-sensitive land uses. A significant impact could occur. Impact 4.13-4: Noise—Compatibility of Proposed Land Uses Exceeding Predicted Noise Levels. [Implementation of Specific Plan III] would result in the n development of noise-sensitive land uses (residential)in an area where predicted noise �1 levels would exceed land use compatibility noise standards established by the San Joaquin County General Plan 2010 and MHMP. A significant impact would occur. MITIGATION MEASURES IDENTIFIED IN 2005 SPIIIEIR In part, SPIIIEIR Mitigation Measure 4.13-1 requires developers to: • Limit project construction activities to the hours between 6:00 a.m. and 9:00 p.m. • Equip all construction vehicles or equipment, fixed or mobile,with properly operating and maintained mufflers and acoustical shrouds. • Arrange alll construction equipment and truck routes to minimize travel adjacent to occupied residences. • Locate stationary construction equipment and staging areas as far as possible from sensitive receptors such as residences. Temporary acoustic barriers may be installed around stationary equipment,if necessary. Implementation of the above mitigation measure would reduce temporary construction- related noise impacts on sensitive receptors to a less-than-significant level. n 4-SS