14 ATTACHMENT 1 EXHIBIT A - Laserfiche WebLink

THE CITY OF Chapter 6 Water Supply Characterization PL£ASANTON 6.2.1.1 City Water Supply from Zone 7 Zone 7 is the City's sole wholesale treated water supplier. The City purchases all potable water required for use within the City's service area from Zone 7, with the exception that the City may extract groundwater per the agreement provisions. The treated water delivered by Zone 7 complies with the Requirements for Drinking Water of the California Department of Health Services and the US Environmental Protection Agency, or their successor regulatory agencies. Zone 7 is also the groundwater manager of the local groundwater basin described in Section 6.2.2. The City has a GPQ of 3,500 AF from the Livermore Valley Main Groundwater Basin (Main Basin) in any calendar year. The City pays Zone 7 a recharge fee for recharging the Main Basin. The City may carry over up to 700 AF of unused pumping quota from one year to another. The City coordinates with Zone 7 on an ongoing basis to track water use and develop future water use projections. 6.2.1.2 Zone 7 Water Supply Sources This section details Zone 7's water supplies and their management in relation with each other. Zone 7's water supply has two major components: 1) incoming water supplies available through contracts and water rights each year, and 2) accumulated water supplies in storage derived from previous years. Incoming water supplies typically consist of annually allocated imported surface water supply and local surface water runoff. Accumulated or "banked" water supplies are available in local and non -local storage locations. To optimize use of its local resources, Zone 7 practices conjunctive use of the Livermore Valley Groundwater Basin. Zone 7 also stores local runoff from the Arroyo Valle watershed in the local reservoir (Lake Del Valle), which is owned and operated by DWR. Two long-term water storage ("banking") agreements with agencies south of Zone 7's service area in Kern County (Semitropic Water Storage District and Cawelo Water District) provide additional flexibility in managing annual fluctuations in supplies. To mitigate the risk associated with significant reliance on imported water supply, Zone 7 continues to develop local sources of water and to diversify its water supply portfolio. In April 2019, Zone 7 completed its 2019 Water Supply Evaluation Update (2019 WSE Update), a follow-up to its 2016 Water Supply Evaluation Update that documents Zone 7's current water supplies based on new information and experience gained since the 2014-2016 drought. The 2019 WSE Update also evaluates various future water supply projects, some of which are discussed in Section 6.2.8. 6.2.1.2.1 Imported Water from the State Water Project Imported water from the SWP, which is owned and operated by DWR, is by far Zone 7's largest water source, providing over 80 percent of the treated water supplied to its customers on an annual average basis. SWP water originates within the Feather River watershed, is captured in and released from Lake Oroville, and flows through the Delta before it is conveyed by the South Bay Aqueduct (SBA) to Zone 7 and two other water agencies: Valley Water (formerly known as Santa Clara Valley Water District) and Alameda County Water District (ACWD). Much of the SWP water continues to southern California via the California Aqueduct. Lake Del Valle is part of the SWP's SBA system and is used for storage of SWP water, as well as local runoff. WEST YOST 6-2 City of Pleasanton 2020 Urban Water Management Plan N-680-00-20-04-wP-a-680-2020uwMP May 2021