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`, MOUNTAIN HOUSE PRGPosED ALTAmoNT HEIGHTS T)sNTATivE MAP 4.ENviRoNMENTAL CHECKLIST 4.16 UmniiS AND SERVICE i. • 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 (50,000 afy—49,738 afy). However, the future demands include 4,616 afy for the East Altamont Energy Center. This project has been terminated. 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 4 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., rationing) that could be enacted to reduce demand during water shortage emergencies. The amount of water conservation that is actually achieved will be an important factor in providing a reliable water supply to meet future demands. Specific Plan III Implementation Measure 12.2.3.c states that water use shall be monitored continuously and adjustment to supply made as necessary as directed by the MHCSD. +- The WSA states that Specific Plan III's proportionate share of the 257 afy shortfall is 41 afy. In response to this conclusion, Specific Plan III proponents proposed that an additional 60 afy of non-potable water would be provided to the College Park site by BBID for landscape irrigation. With construction of this non-potable water system, adequate additional water would be provided to make up the 41-afy shortfall identified in the WSA. Therefore, adequate water would be provided to serve the proposed project, and a less-than-significant impact would occur. e) Result in a determination by the wastewater treatment provider which serves or may r serve the project that it has adequate capacity to serve the project's projected demand in addition to the provider's existing commitments? r, The MHCSD, the wastewater treatment provider for the Mountain House Community, does not have a commitment to provide wastewater treatment for any community or area other than the MHMP area. The MHCSD may provide wastewater treatment to existing houses on the south side of Grant Line Road(Grant Line Village) and the south bank of Old River if those property owners choose to annex to the MHCSD,but the amount of wastewater generated by these houses would be small. Future expansions of the W WTP are discussed in SPIIIEIR. Since these expansions must occur prior to occupancy of houses or buildings in the progressive development of Specific Plan I, Specific Plan II, and Specific Plan III, the MHCSD would always have adequate wastewater treatment capacity. Therefore, adequate wastewater treatment capacity would be provided to serve the proposed project, and a less- than-significant impact would occur. 4-84 NW