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ITISIntegrity Tank Testing Systems, Inc. <br /> November 15 , 1988 <br /> Page 2 <br /> Test Data & Results <br /> MY MINI MART <br /> 1756 North Wilson Way <br /> Stockton, California 95205 <br /> Based upon the aboveground visual inspection we made during <br /> testing, and the results we obtained while testing, we believe <br /> the loss as shown on page 1 may be due to a partial collapse of a <br /> vapor pocket rather than a loss of product from your tank 's <br /> system. Vapors are normally trapped in abandoned lines, buried <br /> manways, and/or vents that exit the tank from the same end as the <br /> tank fill . We attempt to totally collapse and hold nonventable <br /> vapor pockets with hydrostatic pressure; however, we are limited <br /> to the amount of pressure we can apply without exceeding the tanks <br /> P.S.I . limits. <br /> Unfortunately, the only positive and assured remedy for vapor <br /> traps is to expose the tank top and establish mechanical venting. <br /> The advantage to exposing the tank' s top is that you can also take <br /> any remedial action necessary if the losses shown are truly losses <br /> from the system and are not collapsing vapor pockets as we <br /> suspect. <br /> If you need assistance in arranging for this type work, we <br /> will provide you with the name of a competent contactor in your <br /> area that specializes in this type of work. <br /> Again, please contact us if you require additional assistance <br /> or information. <br /> 800 262-8378 166 1Yank West Circle Stockton, CA 95206 (209) 466-8036 <br />