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California Edition: June 2001 Veeder-Root TLS -250, 250i, 300, 300C, 300i, 300PC, 350, 350PC, 350R, 350RPC UST ATGS (Models 8473, 8493 Magnetostrictive Probes) AUTOMATIC TANK GAUGING METHOD Certification: Leak rate of 0.2 gph with Pp = 98.9% and PFA = 0.3%. Leak rate of 0.1 gph with Po = 95.8% and PFA = 0.9%. Leak Threshold: 0.126 gph for leak rate of 0.2 gph. 0.071 gph for leak rate of 0.1 gph. A tank system should not be declared tight if the test result indicates a loss or gain that equals or exceeds this threshold. Applicability: Gasoline, diesel, aviation fuel. Other liquids with known coefficients of expansion and density may be tested after consultation with the manufacturer. Tank Capacity: Maximum of 15,000 gallons. Tanks less than 95% full may be tested. Minimum product level required is based on tank diameter as follows: 48" dia/ min 18"; 64" dia/ min 21"; 72" dia/ min 24"; 96" dia/ min 30"; 126" dia/ min 39". For other tank diameters, see evaluation report. Waiting Time: Minimum of 8 hours between delivery and testing. Minimum of 30 minutes between dispensing and testing. There must be no delivery during waiting time. Test Period: Minimum of 2 hours for leak rate of 0.2 gph. Minimum of 3 hours for leak rate of 0.1 gph. Test data are acquired and recorded by the system's computer. Leak rate is calculated from the difference between the first and last data collected. There must be no dispensing or delivery during test. Temperature: Average for product is determined by probe which contains 5 thermistors . At least one thermistor must be submerged in product during test. Water Sensor: Must be used to detect water ingress. Minimum detectable water level in the tank is 0.544 inch. System is programmed to report water depth only when it exceeds 0.75 inch. Minimum detectable change in water level is 0.027 inch. Calibration: Thermistors and probe must be checked and, if necessary, calibrated in accordance with manufacturer's instructions. Comments: Not evaluated using manifolded tank systems. Tests only portion of tank containing product. As product level is lowered, leak rate in a leaking tank decreases (due to lower head pressure). Consistent testing at low levels could allow a leak to remain undetected. EPA regulations require testing of the portion of the tank which routinely contains product. California regulations require at least one test per month after routine product delivery or when the tank is filled to within 10% of the highest operating level of the previous month. If the 0.1 gph test is used as a tank tightness test there must be no water present in the backfill (groundwater must be below the bottom of the tank), the tank must be equipped with an overfill protection device, and the product level in the tank must be at the overfill protection device set point. Local agency pre -approval is required. To use this as a monthly test option see title 23 CCC Section 2643(b)(2). Veeder-Root Evaluator: Midwest Research Institute 125 Powder Forest Dr. Tel: (816) 753-7600 Simsbury, CT 06070-7684 Date of Evaluation: 09/04/97, 07/01/98 Tel: (860) 651-2700 257 Appearance on this list is not to be construed as an endorsement by any regulatory agency nor is it any guarantee of the performance of the method or equipment. Equipment should be installed and operated in accordance with all applicable laws and regulations.