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LMOUNTAIN HOUSE PROPOSED MACHADO 1)�NTATIVE MAP 4. ENVIRONMENTAL CHECKLIST <br /> 4.11 NOISE <br /> L <br /> L c) A substantial permanent increase in ambient noise levels in the project vicinity above <br /> levels existing without the project? <br /> The proposed project would replace a dairy and fallow pasture land with residential housing, <br /> commercial/office, and light industrial land uses. The proposed project is part of the overall <br /> development of the Mountain House Community. Therefore, noise levels would <br /> significantly increase over existing conditions following construction due to increased traffic, <br /> L community activities, and commercial/office and limited industrial operations. As stated in <br /> Item a) above, these impacts were addressed in the SPIIIEIR,and mitigation measures were <br /> proposed that would make the impacts less than significant. <br /> Mitigation Measures <br /> No additional mitigation measures are required. <br /> L <br /> d) A substantial temporary or periodic increase in ambient noise levels in the project <br /> vicinity above levels existing without the project? <br /> r <br /> Temporary increases in noise levels would be associated with construction of houses, <br /> buildings and infrastructure in the various portions of the Mountain House Community. <br /> tr. Whether temporary construction noise would impact the residents of the proposed project <br /> depends on the timing of development of the various neighborhoods and the Mountain House <br /> Business Park to the south. SPHIEIR addresses construction noise impacts and proposes <br /> r. mitigation measures that would make the impacts less than significant. <br /> ` Mitigation Measures <br /> No additional mitigation measures are required. <br /> e) For a project located within an airport land use plan or, where such a plan has not <br /> been adopted, within two miles of a public airport or public use airport, would the <br /> project expose people residing or working in the project area to excessive noise levels? <br /> L• The Byron Airport is located approximately five miles west of the project site. The Contra <br /> Costa County Airport Land Use Compatibility Plan shows that future noise levels due to <br /> L aircraft flyover noise for worst-case conditions would be less than 50 dBA. This is below the <br /> noise standards for the proposed project(65 dBA La„at outdoor activity areas),thus the <br /> impact of aircraft noise would less than significant. <br /> L <br /> Mitigation Measures <br /> L, No mitigation measures are required. <br /> L n For a project within the vicinity of a private airstrip, would the project expose people <br /> residing or working in the project area to excessive noise levels? <br /> ` This proposed project is not located near any private airstrip. <br /> 4-59 <br />