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UST Monitoring Plan • • Stockton Service Center • The facility has one (1) each 1,000-gallon underground tank used for storing automotive hydraulic oil and one (1) each 1,000-gallon underground tank used for storing waste oil from garage maintenance operations. The lube oil tank is located outside near the northwest corner of the garage building. The waste oil tank is located outside and near the southwest corner of the garage building. Both tanks are constructed of double-walled steel. The exterior surfaces of the tanks are fiberglass-coated. This construction is compatible with the stored products. To prevent overfilling, each tank is equipped with a high-level audible and visual alarm that will annunciate once the product level reaches 95% of tank capacity. Each tank and its' associated underground piping is continuously monitored for leaks by a TM Universal Sensors Model LA-04 electronic system which employs one liquid detection sensor at each of the following locations: 1. At the lowest point of the dry annular space between the inner and outer tank walls. 2. In bottom of the tank's dry product piping secondary containment collection sump. The presence of liquid in either of these spaces will activate an audible and visual alarm in the Leak Alert control panel located in the Garage Building. If an alarm is activated, an assessment to determine the cause must be initiated immediately. On the Leak Alert panel, the top row of four (4) green lights shows that power is on and that the sensors are active. Any of the four (4) red lights in the second (middle) row indicate that a liquid sensor has either detected a liquid or has failed. The third (bottom) row of red lights is for vapor-sensing probes, which have not been installed in this system. These lights should be ignored. A suspected leak justifies immediate leak testing by a state-certified commercial leak tester. A state licensed recycler shall pump product in the waste oil tank out at least once every 90 days. The Division Fleet Supervisor is responsible for the day-to-day operation and maintenance of these tanks and their contents. • II. HYDROGEOLOGY AND SITE LAYOUT Most of the yard drainage is by sheet flow over asphalt or concrete paving to catch basins within the yard. The facility catch basins and storm drains are located strategically throughout the yard. Storm water runoff in the vicinity of the underground storage tanks drains into two local catch basins. From these, it flows through underground piping into an underground oil/water separator, which is located south of the garage building. The separator discharges the storm water through underground piping which is connected to the city's storm drain system near the service center's south (main) entrance gate. The facility site map, showing the location of the pump island, fuel tanks and emergency shutoff switch, is Attachment 6. III. TANK PERMITTING REQUIREMENTS A Permits are required by the San Joaquin County Public Health Services Department, Environmental Health Division to operate Underground Storage tanks. The permits are subject to annual renewal. B. A permit issued by the San Joaquin Air Pollution Control District is required for gasoline storage. The permit is numbered. Copies of the permits are shown in Attachment 1 Iv. UNDERGROUND TANK MONITORING REQUIREMENTS Double-Walled tanks and their associated piping systems require the installation of a continuous leak- detection-monitoring device. Frequent circuit testing must be performed to confirm the operational status of • the equipment. Page 2 of 6 UST Montlodng Plant.dac