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Pimlico Drive Tttrnout nnrl Pipeline Project Enviroiuneirtnl Checklist City of Pleasanton Vault The City of Pleasanton fluoridates its water before entering the distribution system Therefore, a separate vault for fluoride injection will be located adjacent to the Zone 7 turnout vault. The underground vault will be a 6-foot by 4-foot precast concrete vault, approximately 8 feet in depth, at the same depth as the 'Lone 7 turnout vault. The fluoridation building will house hydrofluorosilic acid, used in the fluoridation process and used throughout the City at other facilities. Access to the vault will be provided by a hatch door which will be locked. City maintenance and operations staff will make daily inspections of the vault and fluoridation building for leaks and take corrective actions as required. Leak alarm detectors, similar to those installed at other City facilities, will be installed at the injection point in the vault and at the chemical tank in the fluoridation building. The vault will be equipped with flood alarms. Information collected by the detectors will be transmitted remotely via the SCADA system installed at the site to the City's Operations Control Center, which operates twenty four hours a day, seven days a week. When an alarm is sounded at the City of Pleasanton's Operations Control Center, an operator is immediately sent to the site for inspection and implementation of corrective actions, as needed. Fluoridation Building Mechanical and SCADA equipment used in the fluoridation system to treat Zone 7 water will be housed in a 10 foot by 16 foot (160 square feet) concrete block building located adjacent to the City of Pleasanton's vault and Zone 7 turnout on the north side of Pimlico Drive. "1'he building will be 10 feet high, and constructed of masonry block. The color and texture of the masonry block will be chosen to blend in with area surroundings. The roof will be asphalt shingles. The floor will be a slab on grade with trenched areas covered by reinforced fiber polymer grating over a secondary containment system for the chemical tank. A set of steel double doors that can be locked will be provided at one end of the building for access. The major equipment and requirements for the fluoridation system that will be housed within the fluoridation building include: • A 500-gallon fluoride storage tank • A fluoride metering pump • Fluoride and chlorine analysis equipment mounted on the wall • Emergency shower and eyewash station • Secondary containment for the fluoride storage tank • Ventilation facilities The 500-gallon fluoride storage tank will be a single walled tank which will be placed over grating and the secondary containment system. The secondary containment under the tank will ensure that any leaks or upsets from the chemical tank are contained within the building. T'he secondary containment stricture will be designed according to all state, federal and local regulations including the California Code of Regulations, Uniform Fire Code, California Occupational and Safety and Health Act and California Health and Safety Code, and will be similar to other secondary containment systems in the fluoridation City of Pleasanton 7 Winzler & Kelly Draft Initial Study/Proposed Negative Declaration August 2006 04263501