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Name of ATGS TLS Series 300/400 Monitoring Systems with Manifolded Tanks CSLD Version 8473 Magnetostrictive Probe Test Conditions During Evaluation The data evaluation set included data from tanks of the following sizes Tank Size (gallons) 5929 10,000 12,068 24,284 29,148 Total # of ' Records Percentile of Records Min 20th Median 80th Max 46 (50th) The tanks had various monthly throughputs: Percentile of Records 20th 50 (median) 80th Maximum Monthly throughput (gallons) 8,130 23,410 102,925 226,848 The data included 19 records during hot weather months. 15 records during mild weather months. 12 records during cold weather months. The temperature difference between product added to fill the tanks and product already in the tank ranged from —35.7 OF to 35.3 OF, with a standard deviation of 7.7 OF. The tests were conducted with the tank product levels ranging from 4% to 99% full. L'm'tations on the Results The performance estimates above are only valid when: • The method has not been substantially changed. • The vendor's instructions for installing and operating the ATGS are followed. • The tank contains a product identified on the method description form. • The tank is no larger than 37,000 gallons. • The data records cover days or more. (See Below) • Other limitations specified by the vendor or determined during testing: " The required data length de ends on the throughput and is determined by the statistical a pont m e ata engt range rom 9 days to 28 daVs in Me evaluation The system tests the tank below the liquid product level. The system checks for temperature stability and only accepts data trom penocis of acceptable stability. > Safety disclaimer: This test procedure only addresses the issue of the method's ability to detect leaks. It does not test the equipment for safety hazards. ATGS—CSLD Method Results Form Page 2 of 3