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Results of U.S. EPA Evaluation <br /> Automatic Tank Gauging System ( ) <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 form 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 /> ATO 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.U. Box 2003 <br /> street address) <br /> Simsbury CT 06070-2003 203 651-2700 <br /> (city) sta a 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)l <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 #8473 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 19 does 13 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 />