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MOUNTAIN HOUSE PROPOSED ALTAMONT HEIGHTS TENTATIVE MAP 4.ENVIRONMENTAL CHECKLIST 4.16 UTILITIES AND SERy[CE the water treatment plant(WTP)is five million gallons per day(mgd). Expansion of the plant to its ultimate capacity of 20 mgd, sufficient to serve the entire Mountain House Community at build-out, is underway. Wastewater disposal includes collection through sanitary sewers,treatment at a plant owned and operated by the MHCSD,and land disposal or discharge to Old River. The current, _ average annual-flow capacity of the wastewater treatment plant(W WTP)is 3.0 mgd. Average annual-flow capacity of 5.4 mgd would be required to treat the sewage generated by the entire Mountain House community at buildout. The expansion to 5.4 mgd is scheduled to begin in late 2006 and be completed within 12 to 18 months. The expansion would have to be completed before the proposed Altamont Heights project could be served(Machado Checklist,2006). Storm drainage includes storm drains,water quality basins to remove sediment and other pollutants, and improvements to Mountain House Creek. Details regarding Mountain House Community utilities are presented in the SPHIEIR(EDAW, 2005b). SIGNIFICANT IMPACTS IDENTIFIED IN 2005 SPIIIEIR Five potential impacts were identified in the 2005 SPHIEIR. All five were found to be less _ than significant. The potential impacts included demand for water supply, demand for water infrastructure, demand for wastewater treatment and disposal capacity,demand for wastewater infrastructure,and demand for electricity and natural gas supply and infrastructure. MITIGATION MEASURES IDENTIFIED IN 2005 SPIIIEIR Since all the potential impacts were found to be less than significant,there are no mitigation measures identified in the 2005 SPHIEIR. DISCUSSION REGARDING PROPOSED PROJECT `- a) Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board? The proposed project would generate wastewater that would be treated at the MHCSD W WTP. MHCSD has obtained two permits from the Central Valley Regional Water Quality — Control Board(RWQCB); one for discharging 5.4 mgd of treated wastewater into Old River on a year-round basis, and the other for land disposal of 2.6 mgd of treated wastewater. At the present time,treated wastewater from the W WTP is disposed of on land located north and northwest of the W WTP. River discharge is expected to commence by the end of 2006 once MHCSD has satisfied the pre-discharge requirements of the Central Valley RWQCB permit (Machado Checklist,2006). Until then, land disposal of treated wastewater will continue. — Regardless of the method of disposal,wastewater treatment and disposal must comply with the permits issued by the RWQCB or the RWQCB would initiate enforcement actions that 4-81