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f--; <br /> I� <br /> Herding Lawson Associates <br /> II BACKGROUND <br /> The 7-Eleven facility in Tracy, a convenience store and gasoline station, <br /> i was completed in October of 1978. The facility was constructed over a vacant <br /> site that was probably used for agricultural purposes. <br /> In 1984, the Southland Corporation installed two 4-inch-diameter machine- <br /> slotted PLIC pipes within the backfill of the three underground gasoline tanks. <br /> We understand that these inspection we were installed during the replacement <br /> of a broken concrete slab. This was an attempt to provide the station with <br /> some form of crude, early warning inspection systems. On March 27, 1986, <br /> Lawrence Tank Testing performed precision testing on'all tank systems and <br /> product lines. We understand that the tank test results were inconclusive; <br /> and it was determined that the station should have allin i isolated from <br /> A P� g <br /> the tanks so that each component could be tested separately' Because.inventory ` <br /> reconciliation records did not indicate a loss of any gasoline, and because the <br /> tanks,weren't taking on watar, the stox; was not given a priority during the <br /> first review of- these testing results. n October 27, '1986; the-tanks' and <br /> Y <br /> associatetl lines ware exposed; isolated, and retested, anal it was:detennined F <br /> rthat ail butane'Of the tanks,:were tight A 10,D0O-gallon steel tank <br /> a <br /> : containing unleaded gasoline was determined to:be leaking at a rate <br /> A ( 1 gallons per hour Burin testin o .rations; 0n October, 3Cl1986 ; the tank was <br /> 5 einptied. of all product, and 7-Eleven issued an Underground Storage-Tank <br /> �. - <br /> Unauthorixelease #teport on November 1986. <br /> - s <br />