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Date: 9123193 liaiMatR` >f i Facility ID: SKTNCA14 Facility Name: Pacific Bell Tank Monitoring Equipment TLS -250i Inventory control monitoring of the fuel and long terra tank monitoring for product leakage is accomplished with in -tank continuous product monitoring provided through the installation of the TLS -2501 Tank Level Sensor manufactured by Veeder-Root. The TLS -250i consists of a Computerized Inventory Monitor (CM and one digital Sending Probe (DSP) for each tank being monitored. The highly accurate, all electronic probe has no moving parts for greater accuracy and less maintenance than other electro -mechanical, float -type devices. A single CIM can handle multiple probes and continuously monitor each one, analyzing their signals for liquid, temperature, depth and water level. Based on this input, the CIM computers volumes and stores this information for remote polling, The RE -2320 Serial Interface Communication port permits access to TLS -250i information from remote location via telephone lines. This serial interface is capable of handling up to 15 polling stations from centralized remote locations. The output of the serial port can be formatted for Teletype or computer (IBM-PC) interface. The TLS System has four modes of operation: In -Tank Leak Detection, Tank Detection, Interstitial/Piping Sump Leak Detection and Automatic Delivery Reporting. When the leak monitor mode is activated, the TLS System continuously monitors fuel levels in each tank and can detect losses of 0.2 gph. An hourly report on each tank shows temperature compensated inventory changes to 0.2 gallon based on inventories when the tank leak mode is initiated. The Leak Monitor is activated through a push-button mounted on the front panel, or remotely through the RS -232 Telecommunications Interface. The Tank Inventory Report presents the current status of each tank. It provides station location, date and time, volume and level of fuel, water level and temperature. Interstitial/Piping Sump Leak monitoring will be provided using two liquid sensors placed in the double-wall tank annular space and in the tank manhole space. The LED display on the TLS console will flash indicating the alarm cause and location. The Automatic Delivery Increase Report features are generated two minutes after fuel is delivered to the tank. The printout includes date, time, volume and temperature before and after the increase and the net increase of inventory.