SR 06:147 - Laserfiche WebLink

delivered water quality (expected in the year 2010), Zone 7 is in the preliminary design for its newest and third surface water treatment plant, the AItamont Water Treatment Plant. This plant, when operational, should further improve the quality of delivered water to Pleasanton. Water Storage 7 Water storage reservoirs are used to allow 24-hour delivery of the City's water supply at a relatively constant rate, to accommodate hourly fluctuations in demand, and to provide the required fire flows and emergency reserves. Throughout the Planning Area, PIeasanton stores its water in tank reservoirs which are grouped into four main pressure zones and a number of smaller pressure zones. The main water pressure zones consist of the Lower Zone (representing 80 percent of total demand) and three Upper Zones serving portions of the Foothill Road area in the west (the Foothill Zone and the 770 Zone) and the Southeast Hills and Ruby Hill areas in the southeast (the Bonde Zone). In order to meet the City's projected storage needs to the year 2025, the City will need additional water-storage tank reservoirs in both the City's Lower and Upper Zones. The City plans additional Lower Zone storage adjacent to the City's Tassajara Reservoir that was constructed north ofI-580 in 1993. The location of the additional Upper Zone storage will depend on the location of the new development. Exact sizes of these reservoirs and the timing of construction depend on future water-usage pattems and General Plan buildout projections. Water Distribution System · A system of pipes sized to deliver sufficient water volumes and pressure to service residential, commercial, and industrial users compose the City's water distribution system. Currently, the City's water system contains over 300 miles of water pipelines ranging from 4 to 36 inches in diameter. For planning purposes, new development must provide an average water pressure of not less than 40 pounds per square inch (psi) nor more than approximately 85 psi at the water-service meter. During peak-hour periods, pressure must be at least 30 psi, and during periods of major fire demands, pressure must be at least 20 psi. To service residential, commercial, and industrial customers, the City has located water pipes under most of its streets. The City completed a Water System Master Plan Update in 2004. The update identified additional water pipes that require construction or improvement to meet the City's projected water use as well as the City's water quality and blending needs. The Water System Master Plan has already scheduled the timeliest facilities needs within the City's current four-year Capital Improvement Program. As the City develops new projects, it will require other new pipelines, pumping stations and storage facility additions. In order to increase the reliability, flexibility, and deIiverability of its water systems, both Zone 7 and the City have recently constructed or are designing a number of infrastructure improvements. These improvements include new wells, new turnouts, and new pipelines. In the past 10 years developers have constructed new water storage tanks for the Preserve, Moller, Ruby Hill, and the 7 Camp Dresser & McKee, 2004. 8 Camp Dresser & McKee, 2004. VI-13