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Asults 1 EPA Standard <br />Automatic Tank Gauging System (ATGS) <br />This forth 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 conducted <br />by the equipment manufacturer or a consultant to the manufacturer according to the U.S. EPA's "Standard Test <br />Procedure for Evaluating Leak Detection Methods: Automatic Tank Gauging Systems." The full evaluation <br />report also includes a form describing the method and a form summarizing the test data. <br />Tank owners using this Ieak detection system should keep this form on file to prove compliance with the <br />federal regulations. Tank owners should check with State and local agencies to make sure this form satisfies <br />their requirements. <br />ATGS Description <br />Name Tidel Environmental Monitoring System <br />Version number EMS 2000, EMS 3000 Series Models <br />Vendor Tidel Engineering, Inc. <br />2615 E. Beltline Road <br />Carrollton Texas 75006 (214) 416-6222 <br />Evaluation Results <br />This ATGS, which declares a tank to be leaking when the measured leak rate exceeds the <br />threshold of 0.05 gallon per hour, has a probability of false alarms [P(FA)] of 3.00 %. <br />The corresponding probability of detection [P(D)] of a 0.20 gallon per hour leak is 96.20 %. <br />The minimum water level (threshold) in the tank that the ATGS can detect is 1.36 inches. <br />The minimum change in water level that can be detected by the ATGS is 0.036 inches <br />(provided that the water level is above the threshold). <br />Therefore, this ATGS (?Q does ( ) does not meet the federal performance standards <br />established by the U.S. Environmental Protection Agency (0.20 gallon per hour at P(D) of <br />95% and P(FA) of 5%), and this ATGS (X) does () does not meet the federal performance <br />standard of measuring water in the bottom of the tank to the nearest 1/8 inch. <br />? <br />The evaluation testing was conducted in a 10,000 gallon ()C) steel () fiberglass tank <br />that was 1 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 -5.33 deg .F to +5.35 deg F, with a standard deviation of 4.25 deg F. <br />The tests were conducted with the tank product levels 50 and 95 % full. <br />The product used in the evaluation was unleaded gasoline <br />ATGS - Results Form Page 1 of 2 <br />