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Results of U.S. EPA Evaluation <br />Automatic Tank Gauging System (ATGS) <br />Continuous Statistical Leak Detect Method (CSLD) <br />This form tells whether the automatic tank gauging system (ATGS) described below used in a <br />CSLD mode complies with the performance requirements of the federal underground storage tank <br />regulation. The evaluation was conducted by the equipment manufacturer or a consultant to the <br />manufacturer according to the "Alternative Test Procedure Deemed Equivalent to EPA's." The <br />full evaluation report also includes a form describing the method and a fbrm summarizing the test <br />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 <br />sure this form satisfies their requirements. <br />ATGS Description <br />Name TLS Series 300/400 Monitoring Systems with Manifolded Tanks CSLD <br />Version Number 8473 Magnetostrictive Probe <br />Vendor Veeder-Root <br />125 Powder Forest Drive. P.O. Box 2003 <br />street a ress <br />SimsburV CT 06070-2003 203 651-2700 <br />(city) (state) (zip) (phone) <br />Evaluation Results <br />This ATGS, which operates in two modes depending on the specified probability of detection of <br />a leak rate of 0.20 gallon per hour, declares a tank to be leaking when the measured leak rate <br />exceeds a threshold designed for the chosen mode. The threshold, probability of false alarm, <br />P(FA), and probability of detection, P(D), of detecting a leak rate of 0.20 gallon per hour, are <br />given in the table below for the two modes of operation. <br />Threshold Probability of False Alarm (FA) Probability of Detection [P(D)) <br />0.16 < 0.01% 97% <br />0.15 < 0.01% 99% <br />The minimum water level (threshold) in the tank that the ATGS can detect is 0.54 inch for the <br />magnetostrictive version #18473 probe. Note: The probe does not report water levels below <br />0.75 inch in normal use. <br />The minimum change in water level that can be detected by the ATGS is 0.027 inch for the <br />magnetostrictive version #8473 probe. <br />Based on these results, the method ® does ® does not meet the federal performance standards <br />established by the U.S. Environmental Protection Agency of 0.20 gallon per hour at P(D) of 95% <br />and P(FA) of 5%. <br />ATGS—CSLD Method Results Form Page 1 of 3 <br />