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09/27/1995 11:30 1-510-65B-8448 SHIELDS HARPER CO PAGE 01 ,. Volumetric TTT Methdd • TLS- Oi T -350 UST nit ring Ysteins Version_ 8473 Digital Sensing Probe Magnetostrictive Limitations on the Results The performance estimates above are only valid when: • The method has not been substantially changed. • The vendor's instructions for using the method are followed • The tank is no larger than 15,000 gallons. • The tank contains a product identified on the method description form. *The method tests the tank below the liquid level ' • The tank is at least 95* percent full. Associated testing (at MRI); of the system as an ATG demonstrated that the method is valid when the tank is 50-959 full . • The waiting time after adding any substantial amount Of product to the tank is at least R.95 hours, • The temperature of the added product does not differ more than 8.57 degrees Fahrenheit from that already in the tank. • :The wafting time between the end of "topping off," if any,and the start of the test data collection is at least NA hours. The total data collection time for the test is at least 3 hours. Large vapor pockets are identified and removed (for methods that overfill the tank). • This method E can ❑cannot be used if the ground-water level is above the bottom of the tank. See other limitations below.* • Other limitations specified by the vendor or determined during testing: * in. n `unction with an ATG_Mtem. if the groundwat r level is above .the bottom of the tank, a non-tight tank is detected by means o continuous monitoring of the water level in the bottom of the tank by an 'ATG S stem. Satety disclaimer: This test procedure only addresses the issue of the method' ability to detect leaks. It does not test the equipment for safety hazards. Certification of Results certify that the volumetric tank tightness testing method was operated according to the vendor's instructions. I also certify that the evaluation was performed according to the standard EPA test procedure for volumetric tank tightness testing methods and that the i esutts presented above are those obtained during the evaluation. Dr. J.D. Flora Jr. Mr. G. Joe Hennon MIDWEST RESEARCH INSTITUTE (printed name organ on performing evaluation) KansasCit , Missouri 64110' Ksignature o g, zlp -Anril 26, 1991 (8.16) 753-7600 l ne number) 1 Volumetric TTT Method -Results Form Page 2 of 2 . .