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1.0 INTRODUCTION This report is being submitted at tine request of ran Joaquin County Public Health Department, Environmental Health Division. It represents the results and findings of a site investigation at Reeves (ADA 'Dick's') Exxon Station, 2360 Fast Street, Tracy, Calif::rnia (Figure 1). r- The property has operated as a gasoline station for 39 years, originally retailing regular gasoline . and diesel fuel. At the time of our investigation the station retailed extra unleaded fuel (Tank r 1), regular unleaded (Tank 2), and diesel fuel (Tank 3) from two fuel islands. A 350 gallon waste oil tank was also located behind the repair shoploffice. The gasoline and diesel fuel tanks were 5500 gallon capacity. For tank and product line locations see:figure 2. i 2.0 SITE:HISTORY In September of 1990 a discrepancy in the inventory of petroleum hydrocarbon product records for the underground storage tanks (USTs) prompted the owners of the property to contact WaterWork to begin a site investigation. In December of 1990, Integrity Testing conducted precision testing of the tanks and product lines. The extra unleaded tank failed precision testing. The decision to retest the USTs and product lines was made on the advice of the petroleum hydrocarbon products distributor, who suspected that product line failure might be the cause of test failure. In January 1991, Banks & Moore Company ratested the USTs and product lines on site using a he!ium pressure test. During testing the extra unleaded tank deveioped a leak and. lost an estimated 300 gallons of prodact into the tank pit-, A verbal report of the leak.was made to San / Joaquin County Public Heald Department, Environmental Health Division, and the tank was emptied of all remaining product the same day. Precision and 'Helium test results are included . in Appendix I. ppeo�.wr ;