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4 UNDERGROUND TANK MONITORING PLAN t AND EMERGENCY RESPONSE PLAN Date: August 15, 1996 Facility: Stockton Unified School District Corporation Yard 1944 North El Pinal Drive Stockton, California 95205 Tanks: One (1)20,000-gallon diesel storage tank One (1) 15,000-gallon gasoline storage tank The underground storage tanks at this site are Modern Welding Company manufactured double- wall steel tanks with fiberglass reinforced plastic exterior coating for corrosion resistance. Underground piping is pressurized and consists of a flexible primary fuel line within a flexible containment pipe (Total Containment Enviroflex Piping System). The underground piping slopes to the piping manhole sumps on the tanks. The secondary containment pipe is open to the piping manhole sump so a piping leak would run into the sump. The tank system is monitored continuously by an Incon "Tank Sentinel" monitoring system with liquid sensors located in the double-wall tank annular spaces, the tank manhole sumps and the dispenser sumps. The tank monitor console will be located in the transpiration office and is equipped with a visual and audible alarm. The liquid sensors located in the tank piping manhole sumps will automatically shut down the pumps if a release is detected. The pumps will also be shut down if the monitoring system fails. Tank pumps are equipped with mechanical line leak detectors. Person responsible for monitoring the tanks is Beth Scott, Transportation Director, (209) 953-4734. The tank monitoring system is tested and maintained by a certified third party company on an annual basis. In the event of a leak or spill, the District will notify the San Joaquin County Department of Environmental Health(209)468-3420. The District will notify the following company for the fastest cleanup of the spill or leak possible: 1. Erthco Environmental Service, Inc. 3774 Bradview Drive, Sacramento, CA 95827 (916) 368-0100