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January 22, 1988 ARCO am/pm No. 5469 130 S. Wilson Way/Washington Stockton, CA 95205 MONITORING SYSTEM AND RESPONSE PLAN The secondary containment system of the underground fuel storage tanks and product delivery lines will be continuously monitored by a Raychem Trace Tek TTGS electronic monitor. The system will use both a water probe and a hydrocarbon probe inside the annular space of each tank, and a hydrocarbon probe inside the pipe sump/turbine area of each tank. The probes respond in less than 10 seconds from the time they make contact with the substance being monitored (either water or hydrocarbons) . The system has a self testing circuit which polls the system continuously. The Trace Tek system includes a central monitor panel which has a separate visual display for each channel being monitored. Each channel has the following: 1. One (1) green light to indicate the system is functioning, and is not in an alarm condition. 2. One (1) red light which turns on if there is any interruption of the circuit 3. One (1) red light which turns on when the substance being monitored makes contact with the probe. This condition will also sound an audio alarm immediately. This monitor panel is located in an area of the store between the sales area and the office/storage area which insures that it is seen by employees several times per shift. It is also easily accessible to maintenance personnel and any other authorized persons required to inspect the system. In addition to the electronic monitoring system, the store operator is required by ARCO to perform daily inventory reconciliation by comparing tank stick readings to dispenser totalizer readings. In the case of an alarm condition, the station operator will immediately contact ARCO Maintenance Department to report the condition. The response consists of dispatching a qualified technician to the site to determine the cause of the alarm, and initiate a cleanup if required. Response will be in accordance with the California Administrative Code, Chapter 23, Subchapter 16, Article 3. Response to an unauthorized release will be handled in the same manner.