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Water Planning In September 2000,MHCSD completed the Final Potable Water System Master Plan (WSMP),which calculated that the average daily water demand for both domestic water and irrigation water generated by total development of the MHMP area,with consideration of water conservation, would be 8.8 million gallons per day(mgd)(WSMP 2000).The maximum daily demand for full buildout of the MHMP was calculated to be 17.1 mgd.On an annual basis,the average demand for domestic and irrigation water would be 9,849 annual feet per acre(afa)(WSMP 2000). In August 2003, West Yost and Associates updated the WSMP for MHCSD to reflect proposed changes to the MHMP(e.g., addition of the proposed college campus)(WSMP 2003).Using water demand data collected from existing development in San Joaquin County and assuming less water conservation than the 2000 WSMP,the 2003 WSMP Update calculated that the average daily demand for water for the entire MHMP area would be 9.1 mgd, with a maximum daily demand of 20.0 mgd. This demand calculation did not include the college's water needs for landscaping irrigation purposes because Delta College anticipates using irrigation water rather than _ potable water for all non-domestic water uses. Water Infrastructure BBID operates a raw water pumping station and a pipeline to MHCSD's Water Treatment Plant(WTP). In anticipation of planned expansion of the WTP to 20 mgd maximum capacity,the pump station and pipeline are sized for 20 mgd of raw water. However,new pumps at the pumping station would be required when expansion of the WTP occurs. MHCSD's water infrastructure system consists of three major components: water treatment, water storage, and — water conveyance.MHCSD divides its service area into Zone I and Zone ll.The northeast corner of the College Park project site is located in Zone I;the remainder of the project site is in Zone H(see Figure 3-13 in Chapter 3, "Project Description'). The WTP,which is located along the north side of Byron Road(Figure 3-13)just east of Marina Boulevard,has capacity to treat 1.7 mgd of water. This capacity will be fully consumed with development of Neighborhoods E, F,and a portion of G by Specific Plan I. The 2000 WSMP estimated the WTP would need to be expanded to from 17.1 mgd to 20 mgd to meet maximum daily water demand of the whole of the MHMP area at buildout, depending on the level of water conservation.The 2003 WSMP Update estimates that 20 mgd or more would he required.The most recent plans for WTP expansion call for one phase of improvement to increase the WTP's capacity to 11.9 mgd,and a second phase to increase capacity to 17.1 mgd(MacKay& Somps 2004a). A final expansion phase to reach 20 mgd of treatment capacity may ultimately be implemented, if needed. It is anticipated that the 11.9 mgd expansion required to serve College Park will be completed in 2006(MacKay& Somps 2004a). Sludge produced from the water-treatment plant may be disposed through land spreading,dedicated land disposal, or disposal in a landfill. Water storage is required to ensure efficient system operation and back-up supply in the event of an emergency or required system shutdown.Two water storage tanks are proposed on the college property portion of the College Park site; one to serve each water pressure zone(Figure 3-13). Water would be conveyed from the WTP to the project site through the extension of existing water transmission pipelines/water mains in Central Parkway and DeAnza Boulevard just south of Mascot Boulevard(Figure 3-13). These pipelines would form a closed loop to provide pressure equalization and maintain water quality. An existing pump station serves Zone I in the MHMP area, and at least one new water booster pump station would be required to serve Zone II in the College Park area. A potential location for a new booster pump for Zone II would be near Great Valley Parkway and Main Street. EDAW College Park at Mountain House Spedrfic Plan III Draft EIR Public Utilities 4.5-2 San Joaquin County