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TANK CLOSURE REPORT <br />2320 EL Dorado, Stockton, CA <br />Aegis Project No. 89-049 <br />Page 6 <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 ba <br />tank sin 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 />J"IM <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 detecterf] <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 />