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Because of declining agricultural activity in the project vicinity and decline in the BBID use of project area _ canals,current groundwater elevations in the vicinity of the canals already reflect the effect of diminished recharge from the canals.Additionally,new sources of recharge to the local groundwater table would occur in the future from new development and new BBID customers.Therefore,it is anticipated that the decline in local groundwater recharge from canals 120 and 155 would be more than offset by new sources of recharge. WASTEWATER Existing Wastewater Generators Wastewater generated by agricultural operations and the existing residences on the College Park project site are treated and disposed of in approximately 70 septic tank leachfield systems, dairy waste ponds, and agricultural drainages (San Joaquin County 1994). Wastewater Infrastructure MHCSD operates the wastewater system that serves the MHMP area.MHCSD's wastewater system consists of three major components: wastewater conveyance,wastewater-treatment,and effluent disposal. MHCSD operates ` sewer main pipelines in Central Parkway and DeAnza Boulevard connecting to the Mountain House Wastewater- treatment Plant(W WTP)located north of Byron Road and east of Mountain House Parkway(see Figure 3-14 in Chapter 3,"Project Description!).The existing sewer pipelines end just south of Mascot Boulevard.Connections + from the College Park project site to the existing stubs are planned along two major alignments, including Central Parkway and DeAnza Boulevard.These pipelines would extend south,beyond Grant Line Road(Figure 3-14). Details regarding the size and other elements of the proposed pipelines are detailed in the Amendments to the Sanitary Sewer Collection System Study(MacKay& Somps 2004a).As a temporary option to the extension of the Central Parkway sewer main,the project may be served on an interim basis solely through the DeAnza Boulevard sewer pipeline.This option would require a temporary sewer line from DeAnza Boulevard to Central Parkway along the south side of Grant Line Road.Flow in this temporary system would be limited by the capacity of the downstream mains. MHCSD is planning an upgrading of the W WTP to increase capacity from 0.45 to 5.4 mgd.This upgrade is planned for completion in 2006-2007.This ultimate 5.4 mgd capacity,which includes conversion of the W WTP to tertiary treatment and disposal of treated wastewater to surface waters(Old River), has already undergone California Environmental Quality Act(CEQA)review and project approval.[ However,MHCSD does not own sufficient land area for the final upgrade,but additional land is expected to be transferred from Trimark to MHCSD. 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 Regional Water Quality Control Board(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.The 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 pre-discharge requirements of the Central Valley RWQCB permit(MHCSD 2003). t CEQA review of the 5.4 mgd Mountain House W W7P and associated river discharges was provided in the Expanded Initial Study for the Mountain House Community Services District, SCH#98032047, January 29, 1999. Approval and permitting of the 5.4 mgd WWTP and associated river discharges occurred under Use Permit Nos. 97-14 and 98-16, and Waste Discharge Requirement National Pollution Discharge Elimination System(NPDES)Order No. 98-192.MHCSD has indicated that these Use Permits provide for a 5.4 mgd W WTP that would have sufficient capacity to serve all of Mountain House. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.5-5 Public Utilities