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1 <br /> l.0 INTRODUCTION JRW�AEWAW � <br /> This report is being submitted at the request of San Joaquin County Public Health Services, <br /> Environmental Health Division. It represents the results and findings of an Assessment of Soil <br /> and Groundwater Contamination Investigation at Reeves (AKA "Dick's") Exxon Station, 2360 <br /> East Street, Tracy, California (Figure 1). <br /> ' The property Yhas operated as a gasoline station for 39 years, originally retailmg regular gasoline <br /> ' and diesel fuel. Prior to station closure in April of 1991, the station retailed extra unleaded fuel <br /> (Tank 1), regular unleaded (Tank 2), and diesel fuel (Tank 3) from two fuel islands. A 350 <br /> gallon waste oil tank was also located behind the repair shop/office. The gasoline and diesel fuel <br /> tanks were 5500 gallon capacity. For former tank and product line locations see Figure 2. <br /> 2.0 SITE HISTORY <br /> In September of 1990 a discrepancy in the inventory of petroleum hydrocarbon product records <br /> for the underground storage tanks (USTs) prompted the owners of the property to contact <br /> RESNA Industries (RESNA, formerly WaterWork Corporation) to begin a site investigation <br /> ' In December of 1990, Integrity Testing conducted precision testing of the tanks and product <br /> lines The extra unleaded tank failed precision testing The decision to retest the USTs and <br /> product lines was made on the advice of the petroleum hydrocarbon products distributor, who <br /> suspected that product line failure might be the cause of test failure. <br /> 1 <br /> In January 1991, Banks & Moore Company retested the USTs and product lines on site using <br /> a helium pressure test During testing the extra unleaded tank developed a leak and lost an <br /> estimated 300 gallons of product into the tank pit A verbal report of the leak was made to San <br /> Joaquin County Public Health Services, Environmental Health_Department, and the tank was <br /> ' emptied of all remaining product the same day. <br /> On April 11 and 12, 1991, Banks & Company removed the product lines and USTs under the <br /> supervision of RESNA. During the removal, moderate product odor was noted near the tank <br /> R-012792 LF 1 <br />