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• U157 ` (1-84) ATT Communications AT&T J110 W. TURNER ROAD LODI, CALIFORNIA MONITORING SYSTEM AND RESPONSE PLAN The secondary containment system of the underground fuel storage tank is continuously monitored by a Leak Alert Model Number LA -04 manufactured by Universal Sensors and Devices. The system uses three thermal elements for sensing any type of,liquid. One sensor is located on the south spool of the tank, the second on the north spool and the third on the annular space at the north end of the tank. Each active channel of the Leak Alert System is equipped with a tripot for alarm setpoint adjustment. All tri pots have been adjusted at the factory. If for any reason adjustments are required, instructions have been provided. In addition, there is a push button switch mounted on the enclosure cover panel for performing functional tests of the alarm circuit. The Leak Alert System has a central monitoring panel located in the emergency power room next..to the day fuel tank with a separate visual display on each channel being monitored. Each channel has the following: 1. One green light to indicate the system is functioning and is not in an alarm condition. 2. One red light which turns on when the substance being monitored makes contact with the probe. This condition will trigger a visual and audible alarm located on the panel. In addition, a visual and audible alarm will be indicated throughout the building as a major building alarm requiring immediate attention by company personnel. The building is attended 24 hours a day, 7 days a week. The alarm indications are also remoted to another AT&T office in San .Bernardino, California. The indication will display on a VDT with instructions, names and telephone numbers of responsible personnel to be alerted. Another safeguard that will be utilized is maintaining a log of visual inspections to be performed daily. The inspection will consist of the following;