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TraARenearch Corporation <br /> Results of U.S. EPA Standard Evaluation <br /> Nonvolu>lnetric Tank Tightness Testing Method <br /> This form tells whether the tank tightness testing method described below complies with the <br /> performance requirements of the federal underground storage tank regulation. The <br /> evaluation was conducted by the equipment manufacturer or a consultant to the <br /> manufacturer according to the U.S. EPA's "Standard Test Procedure for Evaluating Leak <br /> Detection Methods: Nonvolumetric"Tank Tightness Testing Methods." The full evaluation <br /> 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 prove <br /> compliance with the federal regulations. rank owners should check with State and local <br /> agencies to make sure this forni satisfies their requirements. <br /> Method Description <br /> Name: Tracer Research r orati n <br /> Vendor: Tracer Research Corporation <br /> 3855 North Bkisin ss Center Drive _— <br /> (street address) <br /> TucsOii Arizona 85705 (602) 888-9400 <br /> (city) (state) (zip) phone) - <br /> Evaluation Results <br /> This method, which declares a tank to be leaking when a threshold amount of Tracer <br /> chemical is detected as a va or in the soil outsidethe lgnk has an estimated probability <br /> of false alarins [P(FA)] (if 9 % based on the test results of 1 false alarms out of -34_ <br /> tests. A 95%© confidence interval for P(FA) is from 0 to 8.5 %. <br /> The corresponding probability of detection [P(D)] of a �l ,gallon per hour leak is <br /> % based on the test results of 33 detections out of 34 simulated leak tests. A 95% <br /> confidence interval for P(D) is from 91 to 19k%. <br /> Does this method use additional modes of leak detection? [ ] Yes [X] No <br /> If Yes, complete additional evaluation results on page 3 of this form. <br /> Based on the results above, and on page 3 if applicable, this method [X] does [ ] does not <br /> meet the federal performance standards established by the U.S. Environmental Protection <br /> Agency (0.10 gallon per hour at P(D) of 95% and P(FA) of 5%). <br /> Test Conditions During Evaluation <br /> The evaluation testis was conducted in a varying size gallon [X1 steel [X] fiberglass tank <br /> that was incles in diameter and _ inches long, installled in backfill. <br /> The ground-water level was var.,Lin inches above the bottom of the tank. <br /> NorolMdric TrT Met"-Rcsrlls For= Page 1 of 3 <br />