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UST Monitoring Plan • Stockton Service Center Stockton Service Center UST Monitoring Compliance Program I. UNDERGROUND STORAGE TANK DESCRIPTION The Stockton Service Center presently operates three (4) Double-Walled Underground Storage: One(1) containing unleaded gasoline fuel, one(1) containing diesel fuel, and one(1) storing waste motor oil, as described below: A. VEHICLE FUEL STORAGE TANKS Construction: TMBuffalo Hide double-walled steel coated with fiberglass-filled resin. Capacity: 10,000 Gallons Unleaded Gasoline, 10,000 Gallons Diesel. Year Installed: 1991. Operating Permit Nos. 006646; 006648;Air Quality Permit No. N601 The facility has two (2) 10,000-gallon capacity underground storage tanks used for storing unleaded gasoline and diesel fuel for motor vehicles. They are located near the center of the service center just south of the garage building and north of the south (main) entrance gate. These tanks are double- walled steel tanks. The tanks' exterior surfaces are coated with fiberglass-filled resin. The tanks' construction is compatible with the stored fuel. Each tank and its' associated piping are continuously monitored for leaks by a Veeder-Root Model TLS-350 electronic system which employs liquid detection sensors at the locations: 1. One sensor at the lowest point of the dry annular space between the inner and outer tank walls. 2. One sensor in bottom of the tank's dry product piping secondary containment collection sump. 3. One sensor in the bottom of each fuel dispenser's dry product secondary containment collection sump. The presence of liquid in any of these spaces will activate an audible and visual alarm in the Garage Building and will shut down the tank's electric fuel pump. If an alarm is activated, the subject fueling system will be immediately inspected to determine the cause. If the source of the alarm cannot be located and corrected, the fuel dispensing system shall be removed from operation and a 0.1 GPH leak test shall be manually initiated. In addition to the three (3) liquid detection probes, each tank's submersible turbine pump is equipped with an electronic line leak detector as a component of the TLS-350 monitoring system. In the eveit of a leak anywhere in the pressurized product piping between the tank and the dispenser(s), the detector will sense the loss in pressure and shut down the pump. The leak will be annunciated at the TLS-350 control panel in the garage building. Each tank's fill-pipe is equipped with an overfill prevention valve that will prevent filling the tank beyond 95% of its' total capacity. In addition, a 15-gallon spill container is provided to collect drainage from the fuel delivery vendor's hose when he disconnects. A pull chain and valve are located inside each container to drain spilled fuel into the tank. At each island, the dispenser nozzles used for filling vehicles from this tank are equipped with automatic shut-off devices to prevent overfilling and spillage. "Topping-off' vehicle tanks and filling of unapproved containers by employees should be highly discouraged. The Division Fleet Supervisor is responsible for daily inspection and the day-to-day operation and maintenance of the fuel and petroleum product storage and dispensing systems and their contents. B. WASTE OIL STORAGE TANKS Construction: TmBuffalo Hide double-walled steel coated with fiberglass-filled resin. Capacity: 1,000 gallons Waste Motor Oil. Year Installed: 1991. Operating Permit Nos. 006639; 006643. The facility has one (1) 1,000-gallon underground tank used for storing waste oil from garage maintenance operations. The waste oil tank is located outside and near the southwest corner of the garage building. The tank is constructed of double-walled steel. The exterior surface of the tank is fiberglass-coated. This construction is compatible with the stored products. To prevent overfilling, the Page 1 of 6 UST Monitoring Plant.0oc