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TANK CLOSURE REPORT <br /> 2320 EL Dorado, Stockton, CA <br /> Aegis Project No. 89-049 <br /> Page b <br /> 3.0 RESULTS <br /> The following subsections present the results of the investigative and <br /> mitigative activities conducted at the site. The information addresses <br /> a site assessment that explored the potential presence of hydrocarbons <br /> around the existing tank basin and within the proposed tank field. <br /> Activities involved in fulfilling tank closure requirements included <br /> evaluating soil conditions and assessing the presence of petroleum <br /> hydrocarbons at the existing tank basin, and mitigation and disposal <br /> of soils containing petroleum hydrocarbons which were encountered <br /> during the tank excavation. <br /> 3. 1 "Pre-Tank Replacement Site Assessment Results Report" Summary <br /> Aegis submitted a "Pre-Tank Replacement Site Assessment Results <br /> Report" in March of 1990. The scope of work and findings are <br /> summarized as follows: <br /> A total of fourteen soil borings were drilled adjacent to <br /> the old tank basin, in the vicinity of the product piping <br /> line near the dispensing islands, and within the area of the <br /> proposed new tank location as shown in figure 2 . <br /> Results from laboratory analysis of soil samples indicated the <br /> following: <br /> Petroleum hydrocarbons were not present at detectable levels <br /> in soil samples submitted from boring locations near the <br /> underground storage tanks. <br /> Toluene and petroleum hydrocarbons as diesel were detected <br /> in soil samples submitted from borings within the proposed <br /> new tank location. <br /> Petroleum hydrocarbons as gasoline and diesel were detected <br /> in soil samples submitted from borings near the product <br /> piping and the dispensing islands. <br /> Additional information on the results of the preliminary site <br /> assessment can be found in Aegis ' "PreTank Replacement Site Assessment <br /> Results Report" (Aegis, March, 1990) . <br /> 'VIRONMENTAL HE, <br /> j,. v1ITrSER'✓! <br />