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-- <br /> ffibomeMsE ON, <br /> .w <br /> C <br /> Harding Lawson Amsociates <br /> II BACKGROUND <br /> The 7-Eleven facility in Tracy, a convenience store and gasoline station, <br /> was constructed in October, 1978, over a vacant site. The Southland Corpor- <br /> ation installed two 4-inch-diameter, PVC casing pipes as inspection wells <br /> % . within the backfill of the three underground tanks in 1984. We understand <br /> s that these inspection wells were installed during the replacement of a br,-ken <br /> k <br /> concrete slab, and in an effort to provide the station with a crude, early- <br /> q <br /> waxning inspection system. On Murch 27, 1986, Lawrence Tank Testing performed <br /> precision testing on tank systems and product lines. We understand that the <br /> tank test results were inconclusive; it was determined that the station should <br /> =+ have all Dioing isolated from the tanks so that each component could be tested <br /> .; =parately. Because inventory reconciliation records did not indicate a loss <br /> of gasoline, the stc=_e was not given a priority during the first review of <br /> test results; <br /> On October 27, 1986, the tanks and associated lines were exposed, isu- <br /> - laced, and retested 'and it was determined that all but one of the tanks were <br /> tight. We understand from Southland that a 10,000-9allon steel tank contain- <br /> G' 1�e ing unleaded gasoline was found to be leaking at a rate of .092 gallons per <br /> r <br /> ho <br /> ur.during testing. On October 30, 1986, the tank was emptied of all product <br /> `- and on Noivembn 5; 1986, 7-Eleven issued an Underground Storage Tank Unau- <br /> thorized Release Report. No estimate is available of the total quantity of <br /> '4 unleaded as that may have been released. <br /> . 9 y a ; <br /> A . <br /> ti a 3 <br /> r � <br />