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Table 4.5-1 Projected Water Demands (gpd) MHMP Estimated Water Demand Proposed Project Water Demand Difference in Water Demand for Project 1,524,579 1,448,010 76,569 Source:MacKay 8 Somps 2004b. Although the proposed project would create a smaller demand for water from BBID than estimated in the MHMP, and although the MHMP EIR projected that adequate water supplies would be available to serve MHMP 2025 buildout when combining the 9,413 afa contracted supply with the 436 afa from Trimark's riparian water rights, there is no guarantee that Trimark will exercise those riparian water rights.For this reason,the SB 610 WSA prepared for the College Park project concluded that water demand associated with MHMP 2025 buildout would exceed contracted supplies in a normal year by 230 afa, starting in year 2020,with the proportionate share of the — shortfall for College Park being approximately 41 afa. In response to this conclusion,the College Park project proponents added a nonpotable water system component to the College Park proposal whereby 60 afa of nonpotable water would be provided to the College Park site by BBID for landscape irrigation.This system is described more fully in Chapter 3,"Project Description." With implementation of this nonpotable water system, adequate additional water would be provided to make up the _ 41 afa shortfall identified in the SB 610 WSA.Therefore, adequate water would be provided to serve the proposed project,and a less-than-significant impact would occur. Mitigation Measure 4.5-1: Public Utilities—Demand for Water Supply. No mitigation is required. IMPACT Public Utilities—Demand for Water Infrastructure. The proposed project would require the expansion of 4.5.2 the existing Mountain House WTP, the extension of existing water pipelines to the project site, and the development of new waterpumps and water storage tanks to serve the project.Such water infrastructure has already been programmed or would be developed as part of the proposed project.A less-than- significant impact would occur. All existing and planned development in the MHMP area, including the College Park project, would generate a maximum estimated peak domestic water flow demand of 17.1 mgd, of which 1.45 mgd would be generated by the proposed project(MacKay& Somps 2004a). -- Consistent with the MHMP,water for the proposed project would come from the existing Mountain House WTP. The approved capacity of the plant is 20 mgd, a sufficient amount to accommodate buildout of the MHMP area, _ which would have a maximum day demand of approximately 17.1 mgd. The current design capacity of the plant is approximately 1.7 mgd,which will be fully consumed with development of Neighborhoods E, F,and a portion of G in Specific Plan I(MacKay&Somps 2004 a).Two expansions of the plant are programmed,one to 15 mgd and the second to 20 mgd.The 11.9 mgd expansion that would serve College Park is expected to be completed in spring 2007(MacKay& Somps 2004 b).With this programmed expansion of the WTP, sufficient water-treatment capacity would be available to serve the proposed project.In addition,before approval of any tentative subdivision maps, a"will-serve"letter is required for that subdivision by the MHCSD,which would avoid a scenario whereby College Park development would come on-line before availability of adequate water, including adequate water-treatment capacity,to serve it. Therefore, a less-than-significant impact would occur with respect to WTP capacity. EDAW College Park at Mountain House Specific Plan III Draft EIR Public Utilities 4.5-32 San Joaquin County