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LMOUNTAIN HOUSE PROPOSED MACHADO TENTATIVE MAP 4.ENVIRONMENTAL CHECKLIST 4.16 UTILITIES AND SERVICE I paving the streets and completing the houses and buildings. These improvements have been Lsubjected 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. Ld) 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) as required by Senate Bill 610 6. and the California Water Code for Specific Plan III(West Yost, 2004). This assessment is required for any residential development greater than 500 dwelling units(such as the Mountain House Community 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 in normal, single dry, and multiple dry Lyears. The conclusions of the WSA are summarized as follows: • MHCSD has an agreement with BBID for a firm water supply of 9,413 afy to serve the LMountain House Community. • BBID has pre-1914 water rights for 50,000 afy based on operational certainty. Therefore, L it is highly unlikely that the State Department of Water Resources (DWR)would ever curtail this supply(including the 9,413 afy to MHCSD) during drought years. • As presented in Appendix F of the WSA,the total average demand for the Mountain L 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. • The agreement between MHCSD and BBID allows BBID to supply more than 9,413 afy to MHCSD if BBID has excess water available. Projections of all the future demands for BBID are presented in Table 1 of the WSA. The projections indicate that BBID would have 262 afy of excess water in the year 2025 if no water reclamation projects are implemented. However, the future demands include 4,616 afy for the East Altamont Energy Center that was to be supplied with reclaimed water. This project has been Lterminated. Therefore, BBID would have 4,878 afy(262 afy+4,616 afy)of excess available supply in normal years. Therefore, BBID could supply an additional 257 afy to MHCSD to satisfy the excess demand described above in most years. L • ' The MHMP states that lands north of Byron Road between the El Pescado Grant Line and Old River have riparian water rights amounting to 2,600 afy that could be used on these lands if the land owners choose to enter into a transfer agreement with BBID. Mountain House Community Neighborhoods I through L are located in this area. It should be noted that these riparian rights could be curtailed by DWR during a water shortage in dry years. �. • Chapter 2 of MHCSD Ordinance 4056 establishes five stages of water allocations(i.e., rations)that could be enacted to reduce demand during water shortage emergencies. L 4-87 L