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MOUNTArN HOUSE PROPOSED ALTAMONT HEIGHTS TENTTATIVE MAP 4.ENVIRONMENTAL CHECKLIST 4.16 UTILITIES AND SERVICE c) Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which.could cause significant environmental effects? A storm drain system, consisting of drop inlets and 15- and 18-inch-diameter pipelines, would be constructed to serve the proposed project before the residences could be occupied. The storm drain would exit the project site via a 15-foot wide easement between two lots at the north end of Court B and would be extended along F Street and.Central Parkway to connect to the existing main storm drain in Central Parkway. A separate, 48-inch-diameter "clean" storm drain would be installed to convey storm runoff that originates in 1.9square miles of undeveloped area southwest of the Mountain House Community through the project site. In the past, this off-site runoff flowed through the perennial drainage swale that crosses the project site in a southwest-to-northeast direction. Construction of the storm drains within the project site would occur prior to paving the streets and completing the houses and buildings. These storm drain improvements have been subjected to previous separate environmental impact assessments as required by CEQA including the SPIIIEIR. These assessments have identified impacts that may be potentially significant and proposed mitigation measures to reduce the impacts to less-than-significant levels. Therefore, a less-than-significant impact would occur with respect to extension of the storm drain system to serve the proposed project. d) Have sufficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed? MHCSD has completed a Water Supply Assessment (WSA) for Specific Plan III as required by Senate Bill 610 and the California Water Code(West Yost, 2004)_ This assessment is required for any residential development greater than 500 dwelling units (such as Specific Plan III of which the proposed project is a part). A WSA includes a projection of water demand at 5-year increments for the next 20 years and assesses the availability and reliability of the local water supply to meet the demands in normal, single dry,and multiple dry years. The conclusions of the WSA are summarized as follows: • MHCSD has an agreement with BBID for a firm water supply of 9,413-acre feet per year (afy) to serve the Mountain House Community. • Through an agreement with the California Department of Water Resources, the BBID has pre-1914 water rights for 50,000 afy that BBID can use with operational certainty at a rate of no.more than 300 cubic feet per second (194,000,000 gpd)(West Yost, 2004). Therefore, it is highly unlikely that the State Department of Water Resources(DWR) would ever curtail this supply(including the 9,413 afy to MHCSD) even during drought years_ • As presented in Appendix F of the WSA, the total average demand for the Mountain House Community at buildout would be 9,670 afy, assuming 14 percent conservation can be continually maintained without any rationing. This demand exceeds the contracted supply from BBID by 257 afy. 4-83