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�7_ <br />C,,. 2. 1 Single -Wall Tanks <br />Facility #11185'Lathrop <br />tanks. In addition, inventory reconciliation is performed daily on each single-wall UST <br />using an approved meter and comparing the contents of the tanks to the daily sales. <br />Refer to Section 4.0 for the reporting format used by the service station. Leaks would <br />be determined by unexplained losses or gains of material stored in the tank. The <br />single wall fuel pipes are continuously monitored by a mechanical Red Jacket leak <br />detection system. <br />11111glil 1111111111 <br />by the state regulations. The SIR system uses manual tank gauging data and plots <br />the data on a computer to determine if a leak or other problems occur. A written <br />statement is annually sent to the local agency which indicates the results from the SIR <br />reports for the previous 12 months. <br />Tank and Pipe Testing: Tanks which are monitored using SIR are required to be testel-, <br />every two years. Currently, the facility conservatively maintains an annual ta <br />testing program, and all single-wall tanks and piping are tested annually. The singl <br />wall tanks and pipes are tested annually using USEPA and state testing methods an <br />certified testing companies. The monitoring systems are tested annually to certi <br />they are in proper working order. <br />The facility does not operate or have any double-wall tanks on site; therefore this <br />subsection does not apply. <br />The monitoring systems (for single and double-wall tanks) shall be inspected annually <br />by running system functions as recommended by the manufacturer. Additionally, the <br />manufacturer may recommend cleaning the monitoring probes annually. The double - <br />walled tanks and piping were also inspected and pressure tested initially before <br />installation at the station. The double -walled tanks were tested using USEPA and <br />state testing methods and a certified testing company.' <br />