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_ •-'� _ { � .� v _ F='rte.�rq.iry _�^ --' .r�t <br /> 4 <br /> M+ <br /> F 1.0 RMOD CTIOlt <br /> r <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 /> P- and Groundwater Contamination Investigation at Reeves (AKA "Dick's") Exxon Station, 2360 <br /> East Street, Tracy, California (Figure 1). <br /> The property has operated as a gasoline station for 39 years, originally retaffing regular gasoline <br /> and diesel fuel. Prior to station closure in April of 1991,the station retailed extra unleaded fuel <br /> f ; <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 /> k,f <br /> tanks were 5500 gallon capacity. For former tank and product line locations see Figure 2. <br /> 2.0 SITE HISTORY <br /> ,x. <br /> i 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 <br /> (RESNA, formerly WaterWark 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 hydrecarbon products distributor, who <br /> suspected that product line failure might be the cause of test failure. <br /> 1".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 Ieak and lost an <br /> t <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 /> E <br /> emptied of all remaining product the same day. <br /> On April I I and 12, 199I, Banks & Company removed the product lines and USTs under the -- - -.-- - — <br /> ,, supervision of RESN,A. During the removal, moderate product odor was noted near the tank <br /> x-012M.LF <br /> E <br /> Nil <br /> i <br />