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MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 5.ENVIRONMENTAL CHECKLIST <br /> 11. NOISE <br /> 5 <br /> Fi c) Would the project result in a substantial permanent increase in ambient <br /> noise levels in the project vicinity above levels existing without the <br /> project? <br /> Refer to the discussion under Item(a) above, Noise mitigation for existing <br /> scattered homes on the east side of Mountain House Parkway and south side of <br /> �- Byron Road is addressed under Item(a) above and in Sections 11.2.2 and <br /> +f 11.2.6 of SPIT. <br /> d) Would the project result in a substantial temporary or periodic increase in <br /> ambient noise levels in the project vicinity above levels existing without <br /> the project? <br /> Temporary increases in noise levels would be associated with construction of <br /> j buildings and infrastructure,schools, parks, and commercial uses.This <br /> construction noise would be of most concern along the perimeter of existing <br /> f neighborhoods. Homes that would be built in Neighborhoods K and L would also <br /> l become new sensitive receptors affected by future construction within the <br /> neighborhoods. This construction would be required to comply with the local <br /> ordinances.While occasionally audible,construction noise is not expected to be <br /> significant and no additional mitigation measures would be necessary. <br /> r e) For a project located within an airport land use plan or, where such a plan <br /> has not been adopted, within 2 miles of a public airport or public use <br /> airport, would the project expose people residing or working in the project <br /> area to excessive noise levels? <br /> The Byron Airport is located several miles to the west of the project area. The <br /> Contra Costa County Airport Land Use Compatibility Plan shows that future <br /> noise levels due to aircraft overflight noise for worst-case conditions would be <br /> less than 50 dB. This noise level is far below the Ldn of 65 dB allowed by the <br /> Master Plan. The aircraft noise impacts anticipated by the 1994 MEIR were <br /> based on information available at that time. Figure 11.1 of the Master Plan, <br /> which shows areas of potential noise impacts, is no longer applicable and the <br /> noise data contained in the current Contra Costa County Airport Land Use <br /> Compatibility Plan should be used. Aircraft noise would not be a significant <br /> impact. <br /> 0 For a project within the vicinity of a private airstrip, would the project <br /> expose people residing or working in the project area to excessive noise <br /> Flevels? <br /> This project is not located near any private airstrip. <br /> + Sources of Information <br /> San Joaquin County,2004. Final Environmental Impact Report, Mountain House <br /> Master Plan. <br /> i <br /> k <br /> (snni) 5-143 <br />