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Results of U.S. EPA Standard Evaluation <br />Automatic Tank Gauging System (ATGS) <br />This form tells whether the automatic tank gauging system (ATGS) described below complies with the <br />performance requirements of the federal underground storage tank regulation. The evaluation was <br />conducted by the equipment manufacturer or a consultant to the manufacturer according to the U.S. EPA's <br />"Standard Test Procedure for Evaluating Leak Detection Methods: Automatic Tank Gauging Systems." <br />The full evaluation report also includes a form describing the method and a form summarizing the test data. <br />Tank owners using this leak detection system should keep this form on file to provide compliance with the <br />federal regulations. Tank owners should check with State and local agencies to make sure this form <br />satisfies their requirements. <br />ATGS Description <br />Name TLS Series _300/350/350R/Simplicity/PC/TLS2 Monitorina Svstems <br />Version number 8463/8473/8493 Magnetostrictive Probe <br />Vendor Veeder--Root <br />125 Powder Forest Drive, P.O. Sox 2003 <br />(street address) <br />Simsbury. CT 06070-7684 (869) 651-2700 <br />(city) (state) (zip) (phone) <br />Evaluation Results <br />This ATGS which declares tank to be leaking when the measured leak rate exceeds the <br />threshold of 0.126 gallon per hour, has a probability of false alarms [PFA] of 1 �5%. <br />The corresponding probability of detection [Pp] of a 0.20 gallon per hour leak is 99.5 %. <br />The minimum water level (threshold) in the tank that the ATGS can detect is 0.66 inch. <br />The minimum change in water level that can be detected by the ATGS is 0.005 inches (provided <br />that the water level is above the threshold). <br />Therefore, this ATGS (X) does () does not meet the federal performance standards established <br />by the U.S. Environmental Protection Agency (0.20 gallon per hour at Po of 95% and PFA of 5%), <br />and this ATGS (X) does () does not meet the federal performance standard of measuring water <br />in the bottom of the tank to the nearest 1/8 inch. <br />Test Conditions During Evaluation <br />The evaluation testing was conducted in a 13.500 gallon () steel (X) fiberglass tank that was <br />120 inches in diameter and 323.25 inches in length. <br />The temperature difference between product added to fill the tank and product already in the <br />tank ranged from -6.0 deg F to +5.7 deg F, with a standard deviation of 4.3 deg F. <br />The tests were conducted with the tank product levels 50 to 95 % full. <br />The product used in the evaluation was diesel <br />ATGS - Results Form Page 1 of 2 <br />