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IMPACT Public Utilities—Demand for Wastewater-Treatment/Disposal Capacity. The proposed project would 4.5-3 require the expansion of the existing Mountain House WWTP, the commencement of river discharges of treated wastewater from the WWTP,and the provision of interim treated wastewater disposal, until such time as the river discharges commence, to provide adequate wastewater-treatment and disposal capacity to serve the proposed project. Such wastewater-treatment capacity and disposal via river discharge has already been approved and programmed,and an interim treated wastewater disposal infrastructure system is proposed as part of the proposed project.A less-than-significant impact would occur. Consistent with the MHMP, wastewater treatment and disposal for the College Park project would be provided by the Mountain House W WTP.The W WTP was planned for and approved as part of the MHMP to include phased expansion to an ultimate capacity of 5.4 mgd, which would be adequate to serve the entire MHMP area(including the College Park project site)at buildout, according to the MHMP EIR. CEQA review of the 5.4 mgd W WTP and associated river discharge to Old River was provided in the Expanded Initial Study for the Mountain House Community Services District, SCH#98032047,January 29, 1999,and approval of these occurred associated with the approval of Use Permit Nos. 97-14 and 98-16 and Waste Discharge Requirement NPDES Order No. 98-192. The W WTP has a treatment capacity of 0.45 mgd,with all this capacity reserved by Trimark(the Specific Plan I and R developer).MHCSD is in the process of planning and designed the next phase of W WTP expansion. This — expansion would be to the ultimate approved and permitted capacity of 5.4 mgd, which is projected to come on line in 2006 and would serve the balance of MHMP development, including College Park(MacKay& Somps 2004 b). — The MHMP EIR determined that a 5.4 mgd W WTP would have sufficient capacity to serve the MHMP area, based on the land uses planned for under the MHMP.The proposed project would change the land uses assumed _ for the College Park site under the MHMP.Table 4.5-2 estimates wastewater generation under both the College Park project and development of the College Park site under the existing MHMP.The project would generate 3 gallons per day of wastewater less than estimated in the MHMP.Therefore,with the approved and permitted expansion of the W WTP to 5.4 mgd, adequate wastewater-treatment capacity would be available to serve the project, and a less-than-significant impact would occur with respect to wastewater-treatment capacity. Approved and permitted river discharges associated with the W WTP have not commenced.Treated wastewater from the W WTP is disposed of on land located north and northwest of the W WTP(Figure 3-14).MHCSD obtained two permits from the Central Valley RWQCB for discharging 5.4 mgd of treated wastewater into Old River on a year- round basis and for land disposal of an additional 2.6 mgd of treated wastewater.These permits were processed with the required CEQA review.However,until the plant operates for a long enough period and sufficient monitoring data is collected to confirm that the W WTP can reliably and consistently produce effluent that meets Central Valley RWQCB's discharge standards,land disposal would be the only option for all treated wastewater.River discharges associated with the W WTP are expected to commence as early as the end of 2005,once MHCSD has satisfied the predischarge requirements of the Central Valley RWQCB permit(MHCSD 2003). To allow for a portion of the proposed College Park development to commence before commencement of river discharges,GNK,LLC has acquired the Pombo property,consisting of approximately 137 acres located on the east side of Mountain House Parkway and just south of Byron Road(Figure 3-14), for temporary land disposal (spray fields applying tertiary treated wastewater at the agronomic rate).Based on the Irrigation Feasibility Study for the Pombo Property(Appendix F),the Pombo property is sufficient to support land disposal of treated wastewater generated by development proposed for GNK,LLC's portion of the College Park project. Although adequate treated wastewater disposal capacity would be available to serve the College Park project once river — disposal commences associated with the W WTP,disposal capacity does not exist to accommodate other than the proposed GNK, LLC development on the College Park site.However,before submittal of any tentative subdivision maps, a"will-serve"I etter is required for that subdivision by the MHCSD,which would avoid a — scenario whereby College Park development would come on-line before the availability of adequate wastewater disposal capacity.Therefore,a less-than-significant impact would occur with respect to water disposal capacity. EDAW College Park at Mountain House Specific Plan III Draft EIR Public Utilities 4.5-34 San Joaquin County