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MOUNTAIN HOUSE NEIGHBORHOOD"F"PROJECT INITIAL STUDY The proposed water treatment plant was the subject of Use Permit UP-97-13 that also was approved by the San Joaquin County Planning Commission with a Mitigated Negative Declaration. Conditions of Approval were integrated into a Mitigation Monitoring Program for this plant, as was done for the proposed wastewater treatment plant. Both the water and wastewater plants are to be sized to meet only the demands of the projected buildout of the Mountain House New Community, and no development beyond the boundaries of the new community. The jurisdiction of the Mountain House Community Services District, which would be responsible for constructing and maintaining the two plants, is the same as the buildout boundaries of the new community as shown in the Mountain House New Community Master Plan. c) Require or result in the construction of new storm water drainage facilities or expansion of existing facilities, the construction of which could cause significant environmental effects? The storm drainage system to serve the proposed project would consist of catch basins, underground piping, open drainage channels, detention basins, and temporary flood diversion berms. Storm water would ultimately be discharged to Old River north of the project site. Existing agricultural ditches and drains would be abandoned in areas that would be subject to this first phase of development, as addressed in the report entitled Mountain House Farm Irrigation Drainage Report for Neighborhood "F"(Condor Earth Technologies, Inc., 2000). Pipes and/or open channels would be used to intercept and convey storm drainage, and would be designed and constructed to transport the 100-year, 24-hour storm event. The flood diversion berms would be placed along the eastern edge of Mountain House Creek(located just west of the project site) and a ditch is proposed along the entire western and southern edge of the project site (see Figure 3)to prevent flooding of the project site. To reduce water pollution during construction, the applicant would be required to obtain a National Pollutant Discharge Elimination System(NPDES)General Permit from the Central Valley Regional Water Quality Control Board at least 30 days prior to the commencement of construction. Interim detention basins would be located north of Byron Road to reduce peak flows downstream and to catch runoff during the time when its carnes the highest concentration of pollutants. Detention basin designs must conform to San Joaquin Public Works Department standards. Other storm water improvements are addressed in more detail in Section J of this Initial Study that includes recommended conditions of approval. d) Have s�ifficient water supplies available to serve the project from existing entitlements and resources, or are new or expanded entitlements needed? A new water treatment plant would be constructed north of Byron Road to serve the proposed project, and other future phases of the Mountain House New Community. The fust phase of construction of the water treatment plant would allow the treatment of up to 2.6 mgd in terms of"reliable capacity" and 6.0 mgd of installed capacity. Water would be supplied by the Byron Bethany Irrigation District(BBID). This first phase of development would require approximately 0.66 mgd average water demand, or 1.45 mgd maximum water demand, according to calculations prepared by the applicant's consultant, ECOLOGIC. The maximum 1.45 mgd water demand would be about 55 percent of the reliable capacity of the proposed water treatment plant, while the average daily demand(0.66 mgd)would be about 25 percent of the plant's reliable capacity. The plant's capacity has been designed to serve more than this first neighborhood in order to be cost-effective for serving future planned development within the new community. According to the Use Permit for the water treatment plant, the water treatment and C1J0BSVSJC\1NMAL=YWINALJNl1' LMUDY•PARTI.DOC(720/00) 49 V.E.UTILITIES AND SERVICE SYSTEMS