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MOUNTAIN HOUSE NEIGHBORHOOD'F"PROJECT INITIAL STUDY Potentially Significant Potentially Unless Less Than Significant Mitigation Significant No Impact Incorporated Impact Impact f) Be served by a landfill with sufficient permitted capacity to accommodate the project's solid waste disposal needs? g) Comply with federal, state, and local statutes and regulations related to solid waste? Environmental Checklist Explanations a) Exceed wastewater treatment requirements of the applicable Regional Water Quality Control Board? The project has been granted the necessary waste discharge permit from the California Regional Water Quality Control Board(Order No. 98-109). This permit was granted for the proposed wastewater plant that would be constructed north of the project site, north of Byron Road. The permit, granted in April of 1998, states that the monthly Average Dry Weather Flow(ADWF) shall not exceed 0.46 million gallons per day(mgd), with future expansion allowed to 2.75 mgd ADWF after specific conditions are met. Reclamation of treated wastewater would be allowed under specific conditions set by the RWQCB permit. The permit states that Phase I construction will require up to 239 acres of field for irrigation during dry months and a winter storage pond with 114 million gallons capacity. While portions of the 239 acres would be within the 100-year floodplain, no irrigation with reclaimed water would be allowed from November through March. The applicant's projection of wastewater quantities for the project has been performed in accordance with the CSD Development Standards. Based on the projected population and commercial, industrial, and school acreages, projected average dry weather flow rates would be 530,585 gpd. The initial phase of the wastewater plant would have a capacity of 225,000 gpd. The future second reservoir would increase capacity another 225,000 gpd(for a total of 450,000 gpd). An additional future plant expansion would be needed to meet Neighborhood"F"buildout requirement of 530,585 gpd(Sutton, 2000). Condition of Approval WASTEWATER-1: The Mountain House CSD shall provide proof to the County Department of Public Works that the wastewater treatment plant has adequate capacity to provide service as the community is built out: No final subdivision map shall be approved for any development that would exceed the available capacity of the wastewater treatment plant. b) Require or result in the construction of new water or wastewater treatment facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? A new water and wastewater treatment plant would need to be constructed to serve this first phase of development of the Mountain House New Community. Both of these plants were addressed in the 1992 and 1994 EMS for the overall Mountain House New Community and applicable mitigation measures were identified for the Mitigation Monitoring Program at that time. In addition, the wastewater plant Use Permit-98-16 (which supercedes and replaces Use Permit Application No. UP-97-14)was approved by the San Joaquin County Planning Commission in June of 1999 and was the subject of a Negative Declaration under the California Environmental Quality Act. Specific Conditions of Approval related to this Use Permit were included in a separate Mitigation Monitoring Program to ensure that no significant environmental effects would result. C lJOB&SJUNMAL 9=rFMAL1NMAL=Y•PARTI.D0C(7/21/00) 48 V.E.UTILITIES AND SERVICE SYSTEMS