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Piutlico Drive Turnout «nd Pipeline Project Envir«iuneirt«l Checklist Project Description "fhe City of Pleasanton's proposed Pimlico Drive Turnout and Pipeline Project consists of the construction and operation of the following facilities: • Anew 5,000 gpm turnout connection from the Zone 7 Water Agency 36-inch Cross- Valley Transmission Main, operated and maintained by Zone 7 Water Agency • Anew fluoridation facility housed in a concrete block building, to be operated and maintained by the City of Pleasanton • Approximately 2,700 feet of 20-inch pipeline, to connect the new turnout to the existing water distribution system in Santa Rita Road, to be operated and maintained by the City of Pleasanton • A fluoride injection vault, to be operated and maintained by the City of Pleasanton • A control valve vault station, adjacent to Santa Rita Road south of Pimlico Drive, to be operated and maintained by the City of Pleasanton. The proposed project facilities are shown on Figure 2 Buckground `fhe City of Pleasanton owns and operates the water distribution system that serves the City and receives most of its water from Zone 7 through six permanent turnouts (a turnout is a connection to an existing water source) to the City of Pleasanton water distribution system. The water distribution system is divided into a number of water pressure zones and the proposed project is located in the Lower Zone, in the northeast quadrant of the City (City of Pleasanton 2004). Purpose The City plans to construct the proposed project to improve operation of the water storage capacity of the Tassajara Reservoir and to improve water quality in the distribution system. Future water demands of the City through build out were presented and analyzed in the City of Pleasanton's 1996 Pleasanton General Plan Update Environmental Impact Report (Mundie & Associates 1996), 1996 General Plan (1996b), and were used in developing the 2003 Water Master Plan update (City of Pleasanton 2003). Water is delivered to and from the Tassajara Reservoir currently through an existing 24-inch water pipeline on Santa Rita Road. The overflow water level of Tassajara Reservoir is 10 to 15 feet higher than the other Lower Zone reservoirs, and as a result, the reservoir cannot be filled to its full storage capacity under current conditions. The proposed project will tie into the existing 24-inch pipeline and provide sufficient increased hydraulic pressure to fill the Tassajara Reservoir to its capacity, and allow better operational use of the reservoir. Improved control capacity of the system with installation of the Santa Rita control valve vault equipment will increase the operational flexibility of the system, which in turn will improve water quality throughout the system. City of Pleasanton 4 Winzler & Kelly Draft h~itial Study/Proposed Negative Declaration August 2006 oaz~3sol