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