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Although the phased expansion of the W WTP and associated river discharges have already been approved and ` permitted, and represent a separate project under CEQA, the significant environmental impacts associated with the W WTP expansion and river discharges from the Mitigated Negative Declaration prepared for Use Permit 98- 16 are summarized below. ► The project would remove prime foraging habitat for the Swainson's hawk. ► Construction and development of the W WTP would impact an adjacent small wetland on the northern boundary of the project site. ► The project would store potentially hazardous chemicals on-site, and the project would increase the amount of chemical-laden sludge disposed of in the wastewater-treatment process.However,the use of chemicals/substances would not create an environmental impact if the W WTP is operated in compliance with the terms of the Waste Discharge Permit. The project would use outdoor lighting for W WTP operations and security. ► The project would be potential incompatible with adjacent park, golf course, and residential uses on the northern boundary of the W WTP. ► The project would result in the potential for uncontrolled trespass into the WWTP. All above impacts identified above as identified in the Mitigated Negative Declaration prepared for Use Permit 98-16 are considered"potentially significant unless mitigation incorporated"before implementation of mitigation measures and"less than significant"after implementation of mitigation measures. Mitigation Measure 4.5-3: Public Utilities—Demand for Wastewater-TreatmentfDisposal Capacity. No mitigation is required. IMPACT Public Utilities—Demand for Wastewater Infrastructure. The proposed project would require the use of 4.5-4 existing sewer pipelines and the development of new sewer pipelines to serve the proposed project. Adequate existing downstream sewer pipelines already exist,and the project includes proposals to extend these pipelines to the project site.A less-than-significant impact would occur. The proposed project would generate an estimated 0.93 mgd of wastewater that would require conveyance to the Mountain House W WTP. Existing sewer trunk pipelines already exist from the W WTP to just north of Mascot Boulevard in Central Parkway and DeAnza Boulevard(Figure 3-14). These pipelines have been sized to accommodate wastewater flows from buildout of the MHMP, including from the College Park site(MacKay& Somps 2004b).The College Park project includes proposals to extend these pipelines to the project site. The size and slope of these proposed pipelines are detailed in the Amendment 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 line.This option would require a temporary sewer line from DeAnza Boulevard to Central Parkway along the south side of Grant Line Road(Figure 3-14). Given that the proposed pipelines would be sized to accommodate the buildout of the proposed project, and that downstream pipelines are already sized to accommodate wastewater from the proposed project,adequate wastewater infrastructure would be provided to convey project wastewater to the W WTP. A less-than-significant impact would occur. Mitigation Measure 4.5-4: Public Utilities—Demand for Wastewater Infrastructure. No mitigation is required. College Park at Mountain House Specific Plan III Draft EIR EDAW San Joaquin County 4.5-35 Public Utilities