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1 <br /> California Edition:June 2001 <br /> Veeder-Root <br /> TLS-250, 2501, 300, 300C, 3001, 300PC, 350, 350PC, 350R, 35ORPC UST ATGS <br /> (Models 8473, 8493 Magnetostrictive Probes) <br /> AUTOMATIC TANK GAUGING METHOD <br /> Certification: Leak rate of 0.2 gph with Po=98.9% and PFA=0.3%. <br /> Leak rate of 0.1 gph with Po=95.8%and PFA=0.9%. <br /> Leak Threshold: 0.126 gph for leak rate of 0.2 gph. <br /> 0.071 gph for leak rate of 0.1 gph. <br /> A tank system should not be declared tight if the test result indicates a loss or gain that equals or <br /> exceeds this threshold. <br /> Applicability: Gasoline,diesel, aviation fuel. <br /> Other liquids with known coefficients of expansion and density may be tested after consultation with <br /> the manufacturer. <br /> Tank Capacity: Maximum of 15,000 gallons. <br /> Tanks less than 95%full may be tested. <br /> Minimum product level required is based on tank diameter as follows: <br /> 48"dial min 18"; 64"dial min 21";72"dial min 24 96"dial min 30"; 126"dial min 39". <br /> For other tank diameters,see evaluation report. <br /> Waiting Time: Minimum of 8 hours between delivery and testing. <br /> Minimum of 30 minutes between dispensing and testing. <br /> There must be no delivery during waiting time. <br /> Test Period: Minimum of 2 hours for leak rate of 0.2 gph. <br /> Minimum of 3 hours for leak rate of 0.1 gph. <br /> Test data are acquired and recorded by the system's computer. <br /> Leak rate is calculated from the difference between the first and last data collected. <br /> There must be no dispensing or delivery during test. <br /> Temperature: Average for product is determined by probe which contains 5 thermistors.At least one thermistor <br /> must be submerged in product during test. <br /> Water Sensor: Must be used to detect water ingress.. <br /> Minimum detectable water level in the tank is 0.544 inch. <br /> System is programmed to report water depth only when it exceeds 0.75 inch. <br /> Minimum detectable change in water level is 0.027 inch. <br /> Calibration: Thermistors and probe must be checked and,if necessary, calibrated in accordance with <br /> manufacturer's instructions. <br /> Comments: Not evaluated using manifolded tank systems. <br /> Tests only portion of tank containing product. <br /> As product level is lowered, leak rate in a leaking tank decreases(due to iower head pressure). <br /> Consistent testing at low levels could allow a leak to remain undetected. <br /> EPA regulations require testing of the portion of the tank which routinely contains product. <br /> California regulations require at least one test per month after routine product delivery or <br /> when the tank is filled to within 10%of the highest operating level of the previous month. <br /> If the 8.1 gph test is used as a tank tightness test there must be no water present in the <br /> backfill(groundwater must be below the bottom of the tank),the tank must be equipped with <br /> an overfill protection device,and the product level in the tank must be at the overfill protection <br /> device set point.Local agency pre-approval is required.To use this as a monthly test option <br /> see title 23 CCC section 2643(b)(2). <br /> Veeder-Root Evaluator: Midwest Research Institute <br /> 125 Powder Forest Dr. Tel: (816) 753-7600 <br /> Simsbury, CT 06070-7684 Date of Evaluation: 09104197, 07/01/98 <br /> Tel: (860) 651-2700 <br /> 257 <br /> Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the <br /> performance of the method or equipment. Equipment should be installed and operated in accordance with all applicable laws and <br /> regulations. <br />