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MOUNTAIN HOUSE PROPOSED MACHADO TENTATIVE MAP 4. ENVIRONMENTAL.CHECKLIST - 4.11 NOISE As a part of the SPIIIEIR analysis, a noise survey was conducted in May 2004 to document the ambient noise environment at various locations in the Specific Plan III area. Based on the measurements taken, average daytime noise levels (in dBA Lam)in the planning area range from the high 50s dBA to the upper 60s dBA depending primarily on distance from nearby roadways and shielding of noise by existing structures. Peak or I..noise levels reach between 76 and 81 dBA and are associated with large trucks and agricultural equipment passing by(EDAW, 2005b). SIGNIFICANT IMPACTS IDENTIFIED IN 2005 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. The proposed project [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. The proposed project would result in new stationary-source noise (specifically, noise from commercial/office/industrial uses and landscape maintenance)that could exceed — applicable County noise standards at existing and proposed nearby noise-sensitive land uses. A significant impact could occur. Impact 4.134: Noise--Compatibility of Proposed Land Uses Exceeding Predicted Noise Levels. The proposed project would result in the development of noise-sensitive land uses(residential)in an area where predicted noise 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 all 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. 4-56