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MAY 12 ' 97 12 : 17 FROM VEEDER-ROOT SERVICE TO 915104205e96 PAGE.006/008 <br /> n 2 <br /> Volumetric TTT Method TLS_20_Q2Qij2Q!2L4 Sgries Monitoring Systems <br /> Version 8473 Digital Sensing ,_qn <br /> Limitations on the Results <br /> The performance estimates above are only valid when: <br /> 0 The method has not been substantially changed. <br /> 0 The vendor's instructions for using the method are followed. <br /> 0 The tank contains a product identified on the method description form. <br /> 0 The tank is no larger than _15,0QQ gallons. <br /> 0 The tank is at least 95 percent full. 1 2 The method tests the tank below the <br /> liquid level. <br /> Associated testing (at MRI) of the system <br /> as an ATG demonstrated that the method <br /> is valid when the tank is 60-95% full. <br /> * The waiting time after adding any substantial amount of product to the tank is at least <br /> 8.25 hours. <br /> * The temperature of the added product does not differ more than 8.57 degrees <br /> Fahrenheit from that already in the tank. <br /> 0 The waiting time between the end of "topping off," if any, and the start of the test <br /> data collection is at least NA hours. <br /> 9 The total data collection time for the test is at least _3 hours. <br /> * Large vapor pockets are identified and removed (for methods that overfill the tank). <br /> 9 This method 0 can 13 cannot be used if the ground-water level is above the bottom of <br /> the tank. <br /> 40 Other limitations specified by the vendor or determined during testing: <br /> This system operates in conjunction with an ATG system. If the groundwater level is <br /> above the bottom of the tanka non-tight tank is detected by mean§ of c <br /> .g n VDMgjL$ <br /> !132nitorina of the water in the bottom of the tank by the ATG system. <br /> > Safety disclaimer: This test procedure only addresses the issue of the method's ability <br /> to detect leaks. It does not test the equipment for safety hazards. <br /> Certification of Results <br /> I certify that the volumetric tank tightness testing method was operated according to the <br /> vendor's instructions. I also certify that the evaluation was performed according to the <br /> standard EPA test procedure for volumetric tank tightness testing methods and that the <br /> results presentad above are those obtained during the evaluation. <br /> G. jgp. Hpnngnjj_ D. Flora Midwest <br /> . Reselrch Institute <br /> (printed nam 1 (organization performing evaluation) <br /> Kansas City, MO 64110 <br /> 99mture) (city, state, zip) <br /> .May 14, 1993 1816) 753-7600 <br /> (date) (phone number) <br />