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Turnout 4 Replacement and Booster Station Turnout 4 is located at the southwest corner of the intersection of Stoneridge Drive and Hopyard Road (see Figure 2 below) and was built in 1980 with a capacity of 4,500 gallons per minute (gpm). The City connects to Zone 7's 30-inch supply line in Santa Rita Road with a 12-inch line designed for 4,500 gpm capacity. The control and metering equipment are housed below grade in a concrete vault with a small building to house the fluoride chemicals and control systems. The site is shared with a "Welcome to Pleasanton" sign, electrical cabinet and traffic signal equipment. W yy Ar �- .t lob ,,.,.o, . Figure 2 - Existing Turnout 4 The turnout operates with higher pressure from Zone 7, pushing water into the City's distribution system. As the Tri-Valley area grew, the available pressure from Zone 7's system decreased when other agencies filled their systems, thus reducing the turnout's capacity to below 1,000 gpm during peak demand. A water booster station is required to ensure the demand can be met regardless of other agencies' activity. The booster station will use electric pumps to pull water from Zone 7's system and increase the pressure to the City's system-desired water-pressure setting, and will be designed to meet the future peak demand of 5,200 gpm. If future peak demands exceed the existing 12-inch piping capacity of the existing turnout (control valve and metering), the piping will be upsized to 16 inches to feed the new booster station. The existing site has minimal space. Staff and the consultant recommended purchasing a prefabricated booster station (built off-site) that can be placed using a crane, thereby limiting the site work to the below-grade piping. During construction, the existing turnout, fluoride system, traffic signal controller and temporary booster pump will remain in operation. The existing tree will need to be removed due to the extensive root damage from the installation of the new piping and equipment pad. The new booster station will be placed between the sound wall and the existing welcome sign in the current landscaped area. Additional equipment will be placed adjacent to the existing fluoride building with new fencing, and plantings will be used to screen the equipment. The welcome signage is anticipated to be mounted to the face of the new building. The booster station is anticipated to be similar to the Recycled Water Booster Station in the Ken Mercer Sports Park (see Figure 3). Page 5 of 10