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Water Storage <br /> <br />Water Storage reservoirs are used to allow the City's water supply to be <br />delivered at a relatively constant rate over a 24-hour period, to <br />accommodate hourly fluctuations in demand, and to provide the required <br />fire flows and emergency reserves. Pleasanton stores its water in a series <br />of tank reservoirs which are grouped into four main pressure zones and <br />a number of smaller pressure zones throughout the Planning Area. The <br />main water pressure zones consist of the Lower Zone (representing <br />82 percent of total demand), and three Upper Zones serving portions of <br />the Foothill Road area in the west (the Foothill Zone and the 770 Zone) <br />and the Southeast Hills and Ruby Hill in the southeast (the Bonde Zone). <br /> <br />In order to meet the City's projected storage needs to the year 2020, <br />additional water storage reservoirs will be needed in both the City's <br />Lower and Upper Zones. The location for the additional Lower Zone <br />storage has been planned to be adjacent to the City's Tassajara Reservoir <br />constructed north of 1-580 in 1993. The location of the additional storage <br />in the Upper Zones will be dependent on the location of the new <br />development. The exact sizes of these reservoirs and the timing of their <br />construction are dependent upon the water usage patterns of future <br />development and General Plan buildout projections. <br /> <br />Distribution System <br /> <br />The City's distribution system is composed of a system of pipes sized to <br />deliver water at sufficient volumes and pressure to service residential, <br />commercial, and industrial users. Under average conditions, water <br />pressure must be maintained at not less than 40 pounds per square <br />inch (psi) nor more than 125 psi at the location of each user. During peak <br />hourly periods, pressure must be at least 30 psi, and during periods of <br />major fire demands, pressure must be at least 20 psi. Water pipes are <br />located under most City streets to service residential, commercial, and <br />industrial customers. <br /> <br />Numerous additional water pipes will need to be constructed or improved <br />in order to meet the City's projected water use. The most significant of <br />these are a connection between the Ruby Hill and Bonde reservoirs and <br />an extension of water main lines to the North Sycamore Specific Plan <br />Area. These additional lines will be built as new development occurs. <br /> <br /> 6 <br /> <br /> <br />