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Pi»~lico Drive Turnout mul pipeline Project Euvironmentnl Checklist Project Description The proposed project will transmit water from the Zone 7 36-inch Cross Valley Pipeline at the eastern boundary of the project area along Pimlico Drive to the existing distribution system at Santa Rita Road. The Zone 7 turnout, fluoridation building, and all associated facilities are located on the north side of Pimlico Drive adjacent to the Zone 7 channel. Water will be metered at the Zone 7 turnout and then piped to an adjacent City of Pleasanton valve vault where water will be fluoridated from an adjacent fluoridation facility before being carried by the proposed 20- inch pipeline along Pimlico and Brockton drives to a tie-in to the City's existing 27-inch water transmission main near the intersection of Santa Rita Road and Pimlico Drive. The existing 27- inch water transmission pipeline connects to a 24-inch water transmission line that delivers water to and from the Tassajara Reservoir. A new control valve vault (Santa Rita control valve) will connect to the existing 24-inch water transmission pipeline adjacent to the western edge of Santa Rita Road, south of the intersection of Pimlico Drive and Santa Rita Road. The Santa Rita control valve will be used to control flows to and from the Tassajara Reservoir and the proposed Pimlico Turnout The Santa Rita control valve vault will be located at the western boundary of the proposed project. The need for the facilities and selection of site location were evaluated based upon review of the overall water system operating requirements and current planning information, as described in the Water Distribution System Master Plan Update (City of Pleasanton 2004). The locations of the facilities were based upon the requirement to place the Zone 7 connection, City of Pleasanton vault and fluoridation building as close to the Zone 7 water source as possible, and to minimize construction impacts to residences. T'he Santa Rita control valve vault site was selected to place the vault as close to the tie-in to the existing 27-inch pipeline under Santa Rita Road, and to minimize impact to commercial businesses and traffic tlow along Santa Rita Road. A detailed description of each of the project facilities is provided below Zone 7 Turnout The Zone 7 turnout will be housed in an underground 9-foot by 13-foot precast concrete vault, approximately 8 feet in depth below grade. The equipment housed in the Zone 7 turnout includes: a flow control valve, a flow meter, pressure gages, a pressure reducing valve, and a check valve. The turnout vault and equipment will be owned and operated by Zone 7, and will be similar to other Zone 7 turnouts in the City of Pleasanton. Access to the vault will be via an interior ladder via a hatch door which will be locked unless in use. 'the vault will be equipped with flood alarms that will be monitored by the Zone 7 operations control center. The Zone 7 turnout will be controlled by a programmable logic controller (PLC), with data telemetered via 2.5 GHz spread-spectntm radio to the Zone 7 operations control center. The radio antenna will be located adjacent to the turnout vault and be approximately 20 to 25 feet high, depending on results of the radio path survey. Zone 7 metering equipment will be mounted adjacent to the turnout vault in an above-grade waterproof housing. City of Pleasanton 6 Winzler & Kelly Draft Initial Study/Proposed Negative Declaration August 2006 04263501