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MOUNTAIN HOUSE PROPOSED ALTA TONT HEIGHTS TENTATIVE MAP 4. ENVIRONMENTAL CI1ECKLIST 4.9 LAND USE AND PLANNING } SIGNIFICANT IMPACTS IDENTIFIED IN 2005 SPIIIEIR The SPIIIEIR identified two potentially significant land use irripacts and proposed-mitigation measures that, if implemented, would make them less than significant. The potentially significant impacts that would affect the proposed Altamont Heights include ibe following: Impact 4.2-1: Land Use and Agriculture~-- Conflict with Existing Land Uses. The proposed land uses would be compatible with the existing on-site and.adjacent land uses with the exceptions of the BBID irrigation canals and pipelines that cross the site. Apotentially significant impact would occur. Impact 4.2-2: Land Use and Agriculture-- Conflict between Proposed Land Uses. The proposed project would not generate conflicts between proposed land uses, except for the proposed lighted community park facilities that would generate conflicts with proposed adjacent residential uses. A significant impact would occur. I MITIGATION MEASURES IDENTIFIED IN 2005 SPIIIEIR In part, SPIIIEIR Mitigation Measure 4.2-1 requires that developers: i • Fence off the two on-site BBID canals from proposed urban development until such time as the canals are filled; • Implement Mitigation Measure 4.9-5 (Public Health& Safety) that ensures proposed residences are not exposed to an explosion hazard from the natural gas pipelines within the PG&E-Chevron easement that bisects the project site; and • Identify an agricultural buffer of no less than 100 feet for any new units in the residential area in and south of Grant Line Village and adjacent to the County line. Mitigation Measure 4.2.2 refers to Mitigation Measure 4.14-4 in the Visual Quality section of the SPIIIEIR. The impact was determined to be less than significant and no mitigation was ! required because of standards imposed by the MHCSD Design Manual requiring that outdoor ! lights be designed to minimize glare and impacts to adjacent residential uses. In addition,the Design Manual requires significant landscaping and earthen berms to reduce lighting impacts, and light sources must be shielded and directed downward away front adjacent land uses. DISCUSSION REGARDING PROPOSED PROJECT r a) Physically divide an established community? The proposed project would not physically divide an established community because it would be constructed in an area that has been used for agriculture, as discussed above. It is a part of the Mountain House Community and is located directly south of the Grant Line Village homesites. Access to the development would be via new roads that would be constructed as a part of the overall development within the SPIII area. 4-49