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TANK CLOSURE REPORT <br /> 2320 EL Dorado, Stockton, CA <br /> Aegis Project. No. 89-.049 <br /> Page 6- <br /> i <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 y ns at the existing tank basin, and mitigation and disposal. <br /> of soils containingetroleum -h hydrocarbons P y ons which were encountered <br /> unt <br /> e d <br /> during the tank excavation. <br /> 3 . 1 "Pre-Tank Replacement Site Assessment Results Reportee 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 !Lthe <br /> underground storage tanks. <br /> I <br /> Toluene and petroleum hydrocarbons as diesel were detected <br /> in soil samples submitted from boring <br /> new tank location. s within the proposed <br /> ij <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 /> I <br /> I <br />