ARCHIVED REPORTS_DRAFT ENVIRONMENTAL IMPACT REPORT

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► violate federal, state, or local statutes and regulations related to solid waste. IMPACT ANALYSIS IMPACT Public Services and Utilities—Impacts on Water Supplies. The proposed project would increase 4.10-1 demand for potable and nonpotable water at the WQCF at rates that could be accommodated by existing and planned potable and nonpotable water supply facilities. Therefore, this impact would be less than significant. SSJID,under contract to the Cities of Manteca,Escalon, Lathrop, and Tracy,has constructed the SCWSP. The project provides treated potable water to the participating cities through construction and operation of a water treatment plant(WTP) and water transmission facilities to deliver treated water. The new WTP is located near SSJID's Woodward Reservoir in Stanislaus County. Water is delivered from the reservoir to the approximately 40-acre WTP facility. An approximately 36.5-mile pipeline conveys treated water from the WTP to turnouts for each participating city. Future water supply for the city of Manteca is planned to consist of conjunctive use of groundwater from the City's existing and planned municipal wells and surface water deliveries from the SCWSP. The City currently has approximately 12,600 AFY of available water supplies, all via groundwater production. The SCWSP will deliver up to 11,500 AFY of treated water through 2010. A subsequent phase would increase the City's water allocation to 18,500 AFY by 2027,or 42.9%of the total water deliveries associated with the SCWSP in normal precipitation years. The WQCF is not currently connected to the City's water system.An on-site groundwater well at the site is used to meet the washing and showering needs of facility staff. Bottled water is used for drinking. In the future,the WQCF would connect to the City's water system through existing distribution pipelines. The City does not keep records on groundwater well usage at the WQCF. Potable water demand at the WQCF is approximately 1,386 gallons per day(American Water Works Association 2006). Estimated future demands for potable water are assumed to increase proportionally to the increase in plant capacity from 9.87 mgd ADWF to 27 mgd ADWF (approximately 174%). Therefore,the proposed project would increase the total daily potable water demand to approximately 3,798 gallons per day(an increase of 2,412 gallons per day). This potable water would be supplied by the existing City water system and future surface water deliveries from the SCWSP. The City would construct on-site water infrastructure improvements that would tie into the existing 12-inch water line located in Yosemite Avenue. Furthermore,the WQCF site is located within the City's urban services boundary.As such,the City has planned for water supplies to serve the WQCF through the City general plan. Nonpotable water at the plant is currently used for facility wash water and crop irrigation.Nonpotable water would continue to be used for similar uses with implementation of the proposed project. Demand for nonpotable water is assumed to increase proportionally to the increase in plant capacity. Because nonpotable water is generated from spillover from the potable water supply system and secondary effluent, and the potable water supply and secondary effluent would increase in proportion to the increase in capacity at the WQCF, adequate nonpotable water supplies would be available. Because the City of Manteca would meet future water supply needs through conjunctive use of surface water from the SCWSP and groundwater from the City's existing and planned municipal wells,the City has planned for water supplies to serve the WQCF through the City's general plan, adequate water supply and distribution facilities are available, and no new or expanded facilities would be required to serve the project,the City has adequate capacity to provide water for the proposed project. Water supply impacts would be less than significant. EDAW Manteca WQCF and Collection System Master Plans EIR Public Services and Utilities 4.10-6 City of Manteca