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09/27/1995 10:53 1-510-658-8448 SHIELDS HARPER 00 PAGE 03 <br /> i <br /> - Reaulta of U.S. EPA Standard Evaluation <br /> Automatic Tank Gauging System (ATGS) <br /> This form tells whether the automatic tank gauging system(ATGS)descriibedbelow co>}�plias with <br /> the performance requirements of the federal underground storage tank regulation The evaluation <br /> was conducted by the equipment manufacturer or a consultant to the manufacturer accolyding to <br /> the U.S.EPA's "Standard Test Procedure for Evaluating Leak Detection Methods.Autramatrc <br /> Tank Gauging Systems."The full evaluation repon also includes a form describing the method and <br /> a form summarW4 the test data <br /> Tank owners using this leak detection system should keep this form on file to prove compliance <br /> with the federal.regulations.Tank owners should check with State and local agencies to make sure' <br /> this form satisfies their requirements. <br /> ATGS Description <br /> Name TLS-250/TLS-2501/TLS-350 UST Monitoring Systems <br /> Version number 8473 Digital Sensing Probe fMaonetostrictiv6) <br /> Vendor Veeder-Root <br /> I <br /> 125 Powder Forest Drive, <br /> P.O. Box 2003 <br /> (Street address) <br /> Simsbury, T 06070-2003 b51-27001 <br /> CRY Lp one <br /> i <br /> Evaluation Results <br /> This ATGS, which declares a tank to be leaking when the measured leak rate exceeds the <br /> threshold of 0.093 anon per hour, has a probability of false alarms [P(FA)] of 0.1 %. <br /> The corresponding probability of detection [Pp)] of a 0.20 gallon per hour leak is J4 % <br /> The minimum water level (threshold) in the tank that the ATGS can detect is -_L,32 inches. <br /> The minimum change in water level that can be detected by the ATGS isO.0024 .inches <br /> (provided that the water level is above the threshold). <br /> Therefore, this ATGS 0 does ❑does not meet the federal performance stendarcls <br /> established by the U.S. Environmental Prot Coon Agency (0.20 gallon per hour at PM of 96% <br /> and P(FA) of 5%), and this ATGS 0 does does not meet the federal performance <br /> standard of measuring water in the bottom of the tank to the nearest 118 inch. <br /> Test Conditions During Evaluation <br /> The evaluation testing was conducted in a 10,000 gallon 0 steel ❑fiberglass tank that <br /> was 96 inches in diameter and 324 inches long. <br /> The temperature difference between product added to fill the tank and product already in the <br /> tank ranged from -8.4 'F to 6.1 OF, with a standard deviation of 5.6 F. <br /> The tests were conducted with the tank product levels 50 and 95 % full <br /> The product used in the evaluation was diesel I <br /> I <br /> ATGS - Results Form . ;.;Page 1 of 2 <br />