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3.10.3 WASTEWATER WASTEWATER TREATMENT AND DISPOSAL Consistent with the MHMP,wastewater treatment for the proposed project would be provided by the Mountain _ House W WTP,which is located north of Byron Road and east of Mountain House Parkway. The W WTP was planned for and approved as part of the MHMP to include phased expansion of the W WTP to an ultimate capacity of 5.4 mgd.This ultimate design capacity would be adequate to serve the entire MHMP area (including the College Park project site) at buildout. CEQA review of the 5.4 mgd W WTP and associated river discharge to Old River was provided in the Expanded Initial Study and Negative Declaration for the Mountain House New Community Wastewater Treatment Plant,SCH#98032047,January 29, 1999. The 5.4 mgd Mountain House W WTP and associated river discharge were approved under Use Permit Nos. 97-13 and 98-16, and Waste Discharge Requirement National Pollutant Discharge Elimination System Order No. 98-192. The W WTP has a treatment capacity of 0.45 mgd,or enough to serve approximately half of the Specific Plan I Neighborhood F development.Disposal of treated wastewater currently occurs for land owned by Trimark within the MHMP area.The plant is being expanded to 3.0 mgd; completion is estimated for May 2005. The plant would then be expanded to its ultimate capacity of 5.4 mgd; a portion of that capacity would be reserved for College Park. The expansion to 5.4 mgd is planned for end of 2005/beginning of 2006. River discharges to Old River associated with the W WTP have not yet begun.This is because,although permitted by the State Water Resources Control Board(SWRCB)and Central Valley RWQCB, conditions were included in the discharge permit which require the MHCSD to: (1)run the WWTP with land disposal until a representative sample of raw sewage and treated effluent water quality can be obtained; and(2)take samples from the receiving waters (Old River)and analyze these to identify the specific quality of the river water at the planned discharge location.From the above sampling,the permit requires that the MHCSD demonstrate that the W WTP can meet the very strict water-quality requirements of the discharge permit. Water sampling is now taking place, and it is — possible that river discharges (to Old River)to the river could begin in late 2005. In 2003,the California Energy Commission approved a permit for the construction of the East Altamont Energy — Center in Alameda County,a 1,100 megawatt facility that would use natural gas as a fuel to generate electricity. The East Altamont Energy Center would be located just west of the Mountain House community, south of Byron Highway. One condition imposed on the center by the California Energy Commission is that the plant must use treated wastewater from the MHCSD W WTP to provide water for the plant's cooling towers.This potential disposal strategy for MHCSD treated wastewater,should it occur in the future,is not a part of the College Park project and is not evaluated in this EIR(SJCCDD 2005). Because capacity does not exist for the College Park project,the W WTP would be expanded to serve the proposed project. As indicated above, expansion of the W WTP to 5.4 mgd,along with river discharges of 5.4 mgd of treated wastewater,has already been reviewed and approved as a separate project under CEQA. - WASTEWATER COLLECTION Sewer mains were constructed by Trimark in summer 2004 from Central Parkway and DeAnza Boulevard to just south of Mascot Boulevard.As shown in Figure 3-14, sewer service for the proposed College Park project, as well as for other Mountain House development south of Mascot Boulevard,would be provided through the extension of these mains southward.As a temporary option to the extension of the Central Parkway sewer main, the College Park project could be served on an interim basis solely through the DeAnza Boulevard sewer.This option would require a temporary sewer line from DeAnza Boulevard to Central Parkway along the south side of Grant Line Road(Figure 3-13).Flow in this system would be limited by the capacity of the downstream mains. EDAW College Park at Mountain House Specific Plan III Draft EIR Project Description 3-40 San Joaquin County