COMPLIANCE INFO_FILE 10 - Laserfiche WebLink

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.s Description of Tank UST 879-G3U1 is a 23.5-foot long, 11-foot diameter gasoline fuel tank, Systems(continued) located approximately 26 feet south of Building 879 (Figure 1), with a capacity of 15,000 gallons. The tank and associated piping were installed in 1994. Each tank was constructed by Trusco Tank Inc.and consists of a primary steel tank surrounded by a secondary,fiberglass-reinforced plastic tank which encapsulates and isolates the primary tank. The secondary tank is not bonded to the exterior surface of the primary tank,thus creating an interstitial space for fluid migration. A cross-section of UST 879-DlUl is shown in Figure 2;a cross-section of UST 879-G3U1 is shown in Figure 3. The tanks can be accessed from two separate manways. The manway above the west side of the tank accesses the fill port,enclosed in a small sump to manage overspill. The sump is underlain by a larger,piping sump which houses the pipe fittings and sump sensor. A second,and larger manway above the east side of the tank accesses the pipe fittings,sump sensor and liquid level probe. Both manway covers lock airtight to prevent intrusion of precipitation (Figures 2 and 3). The piping systems are composed of flexible,double-walled piping made by Total Containment,Inc. Both the primary and secondary piping are connected to a surface-access containment sump. Monitoring Procedures USTs 879-DlUl and 879-G3U1 are monitored in accordance with 23 CCR 2632(d)(1)by continuous electronic monitoring. The electronic monitoring equipment is tested and maintained through annual equipment tests. Electronic Monitoring of Tank Systems The tank is electronically monitored at all times by a Gilbarco monitoring system which includes three monitoring instruments connected by electrical conduit to a Gilbarco Environmental Management Console(Model# PA02620000000),located in Room 1001 in the west corner of Building 879. The Monitoring System includes the following instruments: • An interstitial space sensor(Model#PA02590084000) is a liquid probe that monitors tank integrity. A leak through either the primary or secondary tank will activate the alarm. • A magnetostrictive probe(Model#PA02650480200)monitors liquid within the tank and can distinguish between fuel product and water. An alarm will warn of an unacceptable level of water in the bottom of the tank, a potential overfill during a bulk delivery from a tank truck, a drop in the level of product in the tank to a selected level (notifying the Operator that a delivery is needed), or a sudden loss of fuel during a leak test. Monitoring and Response Program for 879-DlU1 and 879-G3U1 3 of 14