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A. <br />B. <br />MONITORING PROGRAM Pacific Bell (UE -020) <br />124 W. Elm Street <br />SWITCHING Lodi, California <br />E, .!' 1 H <br /><. <br />P="D (vl!_ ZjLP ' ilU1,_6i <br />Initial Leak Test <br />Initial testing of the underground fuel tank system was performed <br />by the installing contractor. Tests consisted of 5 PSI air test <br />of the primary tank and pressure testing of the pipelines. <br />Installed with the double-wall tank was a Veeder-Root TLS -250i <br />tank level sensing system to monitor secondary containment spaces <br />and product level in tank. <br />The diesel fuel stored at this facility is utilized as an energy <br />source to power "Stand-by Power" electrical generating equipment. <br />As such, the diesel fuel maintained in the underground container <br />remains in a static state except for monthly testing of the <br />equipment and times of commercial power interruption. <br />Tank Monitoring <br />Because of underground tank orientation and facility staffing, <br />inventory control monitoring of the diesel fuel and long-term tank <br />monitoring for product leakage will be accomplished with in -tank <br />and secondary containment monitoring. This will be provided using <br />the TLS -250i tank level sensing system. <br />The TLS -250i system consists of a Computerized Inventory Monitor <br />(CIM), one Digital Sending Probe (DSP), and three liquid sensors. <br />The in -tank probe (DSP) senses product temperature, depth, and <br />water level. Thprobe will also sense a high level _product <br />condition, and wil sound an audible and visual alarm via bell and <br />strobe light mounted on outside building wall in view of fuel <br />delivery personnel. The bell will automatically silence after 30 <br />seconds and the light 30 minutes after a tank overfill event (set <br />at 90% tank diameter). However, the TLS -2501 console will <br />continue to indicate an overfill condition by flashing LCD's <br />(liquid crystal display) until overfill condition is corrected. <br />The three liquid sensors are placed in the double-wall tank <br />annular space, the tank manhole space, and in the tank <br />piping sump, respectively. The liquid sensors will detect <br />either water or diesel fuel and in the event a leak is detected, <br />the TLS -2501 console will sound an audible alarm and in addition <br />an alarm will be telephoned automatically to Pacific Bell's <br />monitoring center in Fresno. The LED display on the TLS console <br />will flash indicating the alarm cause and location. <br />