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MOUNTAIN HOUSE NEIGHBORHOOD'F"PROJECT INITIAL STUDY c) A substantial permanent increase in ambient noise levels in the project vicinity above levels existing without the project? The traffic and noise generated by the development of Neighborhood"F" is consistent with the traffic expected in the Master Plan 1994 EIR analysis and this development is a part of the Master Plan. It would in itself have no significant adverse ambient noise impacts. d) A substantial temporary or periodic increase in ambient noise levels in the project vicinity above levels existing without the project? There are no existing residents in the area. The project is part of the Master Plan and any temporary(i.e., construction noise impacts)were anticipated in the Master Plan 1994 EIR. No additional mitigation measures would be necessary. e) For a project located within an airport land use plan or, where such a plan has not been adopted, within two miles of a public airport or public use airport, would the project expose people residing or working in the project area to excessive noise levels? The Byron Airport is located about five miles northwest of the Mountain House New Community. Straight-in, single-event landing approaches at the airport could impact the southern portion of the community. The Master Plan, Section 11.3.5, addresses noise from straight-in, single-event landing approaches and the requirement for deed disclosures for new residents within a mapped "area of potential aircraft noise impact from Byron Airport" (Figure 11.1 of Master Plan). This area includes a portion of the project site. Given that a realignment of the runway occurred since the Master Plan was prepared, the County shall revise Figure 11.1 after Contra Costa County has completed the public draft of the Airport Land Use Compatibility Plan. Figure 11.1 was based on the preliminary pre-construction drawings for the runways. When actual construction occurred(after 1994), the final alignment varied by about five degrees. Condition of Approval NOISE-1: Figure 11.1 of the Master Plan shall be revised by San Joaquin County when the Airport Land Use Compatibility Plan of Contra Costa County is adopted. The deed notice requirements stated in the Master Plan (Section 11.3.5(b)) would then apply to a new area of the overall Mountain House New Community. fi For a project within the vicinity of a private airstrip, would the project expose people residing or working in the project area to excessive noise levels? This project is not in the vicinity of a private airstrip and aircraft noise levels are not expected to be significant on the site. CAJOWSIMMIAL SnMYTMAL1rrLAL=Y-annn.D0C(720M) 85 V.H. NOISE