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California Edition:June 2000 <br /> Veeder-Root <br /> TLS-200, 200i, 250, 250i, 300, 300C, 3001, 300PC, 350,350PC, 350R, 350RPC UST ATGS <br /> (Model 8473 Digital Sensing Magnetostrictive Probe) <br /> AUTOMATIC TANK GAUGING METHOD <br /> Certification: Leak rate of 0.2 gph with Po=99%and PFA=0.1%. <br /> Leak rate of 0.1 gph with Pp=99%and PFA= 1%- <br /> Leak <br /> %.Leak Threshold: 0.093 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 /> Tank must be between 50 and 95%full for leak rate of 0.2 gph. <br /> Tank must be minimum 95%full for leak rate of 0.1 gph. <br /> Wafting Time: Minimum of 8 hours, 18 minutes between delivery and testing for leak rate of 0.2 gph. <br /> Minimum of 8 hours, 15 minutes between delivery and testing for leak rate of 0.1 gph. <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 dderence 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 a minimum of 5 thermistors. <br /> Water Sensor: Must be used to detect water ingress. <br /> Minimum detectable water level in the tank is 0.544 inch. <br /> Minimum detectable change in water level is 0.027 inch. <br /> Calibration: Thermistors and probe must be checked and calibrated if necessary in accordance with <br /> manufacturer's instructions. <br /> Comments: Not evaluated using manifold 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 kywer head pressure). <br /> Consistent testing at low levels could allow a leak to remain undetected. <br /> EPA leak detection regulations require testing of the portion of the tank system which routinely <br /> contains product. <br /> California regulations require at least one 0.2 gph test per month after routine product delivery <br /> or when the tank is titled to within 10%of the highest operating level during the previous <br /> month. <br /> If the 0.1 gph test is used as a tank tightness test there must be no water present In the backfill <br /> (groundwater must be below the bottom of the tank),the tank must be equipped with an overfill <br /> protection device,and the product level In the tank must be at the overfill protection device set <br /> point. Local agency pre-approval Is required. To use this as a monthly test option see title 23 <br /> CCR Section 2643(b)(2). <br /> Veeder-Root Evaluator: Midwest Research Institute <br /> 125 Powder Forest Dr. Tel: (816)753-7600 <br /> Simsbury,CT 06070-2003 Date of Evaluation: 05/14/93, 03/14/95 <br /> Tel: (860)651-2700 <br /> 246 <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 />