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RES 07163
City of Pleasanton
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RES 07163
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6/15/2009 1:03:17 PM
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12/31/2007 1:57:28 PM
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CITY CLERK
CITY CLERK - TYPE
RESOLUTIONS
DOCUMENT DATE
12/18/2007
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DOCUMENT NO
RES 07163
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City of Pleasanton <br />Final Water Supply Assessment <br />Stoneridge Drive Specific Plan Amendment and Staples Ranch Project <br />vwrora -vwo 11112.01 Stâ– ples Rrich INSANFInstfleal W8Ad.. <br />Cottonwood Creek. Just northeast of the current Pleasanton city limits, the Arroyo Las Positas joins <br />the Arroyo Mocho. Figure 4 shows the Arroyo systems in Zone 7's service area. <br />5.1.1 Water Treatment and Capacity <br />Zone 7 currently operates two water treatment plants (WTP), Del Valle WTP and Patterson Pass <br />WTP. Total surface water treatment design capacity is 55 mgd. At present, Zone 7 is in the final <br />design, permitting and pre -bid stages of constructing a third WTP in the Altamont Hills. The <br />Altamont WTP will initially treat 24 mgd and but is being planned to expand up to 42 mgd as needed <br />over the next 20 years. When all three WTPs are operating at capacity, Zone 7 will be capable of <br />producing up to 98 mgd. Zone 7 also operates seven wells located in Pleasanton within three well <br />fields with a combined peak pumping capacity of 32 mgd. In order to ensure proper distribution of <br />both its treated surface water and groundwater well supplies, Zone 7 also manages a regional <br />pipeline transmission and conveyance system used to transport potable water supplies to the retail <br />water agencies. <br />5.2 City of Pleasanton Service Area and Water System <br />The City of Pleasanton's Water Department supplies water to approximately 22,000 residential, <br />commercial, industrial, govemmental, and landscape irrigation customers throughout the city limits.' <br />The City's water supply system is primarily dependent on the supply of water available from Zone 7 <br />sources (supplying approximately 75 80 percent of the City's annual water demand). The City's <br />transmission and distribution system connects with Zone 7's water conveyance pipelines at seven <br />metering locations (tumouts) located throughout the City. The City also operates three municipal <br />groundwater wells to supplement the purchased supplies. These wells supply the remaining 20 25 <br />percent of total annual City water demand. The City's service area is shown in Figure 5. <br />5.3 Water Supply Setting <br />5.3.1 Climate <br />Pleasanton's climate is best described as Mediterranean, characterized by hot, dry summers and <br />cool, moist winters. Annual precipitation in the region varies from 24 to 28 inches in the westem <br />portions of the Livermore Amador Valley to approximately 14 inches in the more arid, eastem <br />locations. Table 5 -1 shows the average annual precipitation, evapotranspiration and irrigation <br />demands in and around the project area. <br />7 Personal Communication with City of Pleasanton Utilities Department, October 2007. <br />5 -3 <br />4.0 Water Agency Background <br />
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