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UNDERGROUND STORAGE TANK ROUTINE MONITORING PROCEDURE Sprint Communications Company Stockton Switch Facility 3807 Coronado Avenue Stockton, CA 1.0 UST SYSTEM The 10,000 gallon double walled fiberglass underground storage system (UST) supports 3 standby generators. A Simplex pumping system located in the basement, delivers fuel as called for by low level sensing devices integral to three (3) double walled contained day tanks located at each generator. 2.0 PROTECTIVE MEASURES 2.1 Overfill prevention mechanism are inspected prior to tank filling including; Veeder-Root overfill limit feature set at 90% for activation of the alarm; Proper functioning of the automatic shut-off device installed on the transport company's transfer hose. 2.2 All fuel transfers are performed under the supervision of a facility employee. 2.3 Compartment of the tank truck is holding only the amount of diesel fuel required for transfer to fill UST at 90% capacity. 2.4 Transport vehicle is properly disconnected from transfer lines prior to departure. 2.5 Outlets of trucks are visually inspected for any signs of leakage 2.6 Griswald pressure valves and sustaining valves installed in front of each day tank. 2.7 Return lines from day tanks installed directly back to the UST. 2.8 All underground piping construction is 2" fiberglass in 3" fiberglass (Double walled) 2.9 Audible and visual alarms located in close proximity to UST 3.0 MONITORING UNIT The UST is equipped with a Veeder-Root TLS 350 automatic leak detection /monitoring system. This system consist of a continuous inventory monitoring, 0.1 GPH in -tank leak detection, and interstitial and piping sump leak sensing. The TLS -350 has been programmed for alarm limits that warn of in -tank conditions; product loss due to leaks, high water in tank, potential overfill, low inventory, and product loss due to theft. Monitor Procedure 1 9/6/94 Stockton Switch Facility Revision /94