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5.ENVIRONMENTAL CHECKLIST MOUNTAIN HOUSE NEIGHBORHOODS K AND L INITIAL STUDY 16.UTILITIES AND SERVICE SYSTEMS II 100-year storm has a one-percent chance of occurring every year. Installation of these storm drain systems was subject to earlier environmental review in the 1994 MSIR. No additional mitigation measures are necessary. Storm drainage is also addressed in Section 5.8, Hydrology and Water Quality, of this Initial Study. d) Would the project have sufficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed? The currently proposed development within Neighborhoods K and L would not be substantially different from that evaluated in the 1994 MSIR or the SPII Initial Study. Prior to approval of any Tentative Subdivision Maps, the MHCSD must issue a"will-serve"letter to confirm that adequate water treatment plant capacity is or will be available. For SP11 (which includes Neighborhoods K and L),the MHCSD completed a Water Supply Assessment(WSA)as required by Senate Bill 610 and the California Water Code(West Yost,2004). The MHCSD also completed a "Written Verification"of sufficient water supply in accordance with Senate Bill 221 (West Yost, 2006).3 These water analyses are required for any residential development larger than 500 dwelling units. They include projections of water demand at five-year increments and assess the availability and reliability of the local water supply for the development in normal, single dry, and multiple dry _ years. Although the analyses were specifically written to address SPIT,they also consider water demands for SPI and SPIII to present a complete analysis for the entire Mountain House community. Their conclusions are generally as follows: 1) The MHCSD has a firm water supply of 9,413 afy from BBID to serve the Mountain House community. 2) The total average demand for all of the Mountain House community at buildout would be 9,867 afy assuming water conservation and no reclamation. This demand exceeds the contracted supply from BBID by 454 afy, However,water supplies for the year 2025 should be available to meet the demands of SPI and SPIT. The 2006 Written Verification concludes that sufficient water supplies are available to meet SPII water �[ demands in normal,single dry, and multiple dry years. �f 3 A water assessment was also recently prepared for SPI II and the Mountain House Business Park (MHBP)in accordance with Senate Bill 221 (West Yost&Associates,Senate Bill 221 Wirtten Verification for Mountain House Specific Plan III and Mountain House Business Park,Draft prepared for Mountain House Community Services District,September 29,2006). This assessment(page 28)found that'water supplies for the year 2030 are not sufficient to meet the demands of SPIII." The assessment contained information on SPIT,but indicated that"this SB 221 Written Verification is only for SPIll and the MHBP...A separate Written Verification was prepared for SPIT...any specific water supply and demand information for SPI I should be taken from the Written Verification for SPIL" This Initial Study therefore relies on the 2004 Water Supply Assessment and 2006 Written Verification prepared for Specific Plan II,of which Neighborhoods K and L(the currently proposed project site)are a part. Isnn I 5-202