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of the present worth of Zone water supply facilities), and <br />investment earnings on idle funds. <br /> <br />Water Storage and Distribution <br /> <br /> The service area of the Enterprise is divided into three <br />pressure zones. The approximate range of elevations served by <br />each zone is as follows: (1) Lower Zone up to 390 feet <br />elevation; (2) Bonde Zone from 390 to' 550 feet elevation; and <br />(3) Pleasanton Ridge Zone from 390 to 1,500 feet elevation. A <br />description of water supply, storage, and distribution <br />facilities within each zone is summarized below from the City's <br />Water Master Plan. <br /> <br /> Raw SWP water and surface runoff water stored at Lake Del <br />Valle is treated at Zone 7's Patterson Pass and Del Valle Water <br />Treatment Plants and conveyed to the Enterprise at four turnout <br />points from Zone 7's cross valley water pipeline. During peak <br />demand periods, groundwater drawn from Zone 7 wells is <br />chlorinated and made available to the Enterprise at the four <br />turnout points. <br /> <br /> Lower Zone. The combined water supply capacity of the four <br />Zone 7 turnouts is 11,300 gallons per minute ("gpm"). <br />Additional water supply capacity of the three City-owned wells <br />located in the Zone is 6,800 gpm. Water storage is provided by <br />the Kottinger and Foothill Reservoirs which have a combined <br />capacity of 10 MG. Water is distributed in this zone without <br />the need for booster pumps through pipes ranging in size from <br />six inches to 24 inches. <br /> <br /> Bonde Zone. The required water supply capacity to serve <br />this zone is one maximum day demand at the rate of 1,500 gpm. <br />Two booster pump stations, having a combined capacity of 2,600 <br />gpm, meet this zone's water supply capacity needs. Water <br />storage requirements to meet operational fluctuation, fire <br />protection, and emergency needs of this zone total 2 mg. <br />Available water storage capacity of 3.3 MG exceeds these <br />requirements. <br /> <br /> Pleasanton Ridge Zone. Water supply capacity needs, equal <br />to one maximum demand day at the rate of 200 gpm, are met by <br />four booster pumps having a combined capacity of 400 gpm. <br />Water storage facilities in this zone at 2.52 MG are adequate <br />to meet this zone's water storage needs of .43 MG. <br /> <br />Future Facility Needs <br /> <br /> The City's Water Master Plan evaluated Enterprise <br />facilities and recommended the construction of additional water <br />storage, piping, and pumping facilities. <br /> <br /> 19 <br /> <br /> <br />