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Item No. 2 PC: 4-9-92 GP-89-11 Page 11 Water Supply: BBID will be the water purveyor for the entire Mountain House new community. Before BBID can provide water to the new community, several applications must be processed. An annexation application must be processed through LAFCO to add the property north of Byron Road into the District. Most of this area is currently not served by any district and gets its water via riparian rights from Old River. At the eastern edge of this northern property, adjacent to Wickland Cut, is a 200-acre parcel that is within the Westside Irrigation District. This will require a district reorganization, as well as an annexation, to be approved before all of the land is within a single water district. In addition to the proposed annexation/reorganization, BBID is also pursuing an amendment to their pre- 1914 water rights to allow them winter water rights. This would allow them to draw water throughout the year, rather than based on past use (i.e., water required during the growing season). The project proponents are currently processing an application with the State Water Resources Control Board. BBID can convert its agricultural water to M & I (Municipal and IndustriaD uses without limitation. Thus, all of the current water that is being used on the site can be treated and distributed to the new town. The historical average has been about 8,125 acre feet per year. Once the northern portion of the site has been annexed, this allocation must be spread to include this area as well. Estimates for water use over the entire site at buildout are approximately 10,391 acre feet per year. Thus, in order for there to be an adequate water supply, significant water reclamation will need to take place. The proponents propose up to 100 percent water reclamation and plan to use treated wastewater throughout the site to irrigate golf courses, parks, open space areas, and, if required, nearby agricultural lands. Wastewater: The land use diagram indicates that the wastewater treatment plant to serve the new community would be located at the northeastern edge of the site in an area designated for public use. In this location, it would be buffered from neighboring land uses. To the east of the proposed treatment plant outside of the project site boundary, agricultural and open space uses would remain. Since prevailing winds flow to the east and southeast, odors that may be emitted would be blown away from the development. It is important that this use be located on the site, since the Mountain House new community is designed to be self-contained, with all of its supporting water, wastewater, and other services to be located within the boundaries of the site. If the plant were located off the site, away from the proposed project, there could be growth-inducing impacts. Property owners of vacant land adjacent to the plant may propose to extend service lines from the wastewater or water treatment plant to support new islands of development in areas that are not designated for growth. The applicant proposes to reclaim treated wastewater as a disposal method during nine months of the year. This will result in a decreased demand for potable water as noted above under 'Water Supply.' This estimated reduction is based on using reclaimed, treated wastewater to irrigate 1377 acres of the project site. The applicant also plans to use this water to irrigate up to 600 acres of the land available to the west of the project site to dispose of the remainder of the wastewater generated within the project. However,the applicant is still proposing to discharge treated wastewater to Old River during periods when water cannot be reclaimed through irrigation. The Bureau of Reclamation has indicated strong resistance to the proposed treated wastewater discharge to Old River from this project. The Bureau finds the proposed discharge of treated wastewater and urban runoff to Old River unacceptable due to the proximity of the proposed discharge to the intake to the Delta- Mendota Canal. Mitigation measures in the EIR state that more on-site reclamation opportunities should be investigated to reduce the surface water discharge and to reduce the project's water demand. This