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1 5 ANALYTICAL RESULTS AND DISCUSSION <br /> i <br /> 5.1 Soil Samples <br /> L'`•. Soil samples collected from each of the soil borings were evaluated for total petroleum <br /> hydrocarbon compounds,and purgeable halocarbons. In addition,the soil samples collected <br /> from the angle borings under the 500 gallon leaded gasoline tank were evaluated for 1,2 <br /> EDB and TEL The laboratory results are summarized and presented in Table 1. Complete <br /> analytical reports are located in Appendix 2. <br /> „. The analytical results show that none of the soil samples collected from the borings contain <br /> detectable levels of petroleum products or purgeable halocarbon compounds. As a result <br /> the borings define a clean zone around the former underground waste ail tank. Only SB-1, <br /> located adjacent to the service garage, contained any visible trace of contamination. The <br /> location of SB-1 therefore, represents a southward limit of the extent of waste oil <br /> contamination remaining in the soil. Since previous sampling of the former waste oil tank <br /> I excavation had confirmed the removal of all contaminated soil in the north, east and west <br /> walls of excavation, (Tank Excavation Assessment Report,February 1990)SB-1 provides an <br /> estimate of the areal and vertical extent of the remaining contamination. <br /> Soil samples collected from beneath the 500 gallon leaded gasoline tank also shows no <br /> -� detectable levels for gasoline, BTXE, EDB and TEL, suggesting that no leakage had <br /> occurred from either the tank or its associated pipelines. <br /> l 9 <br />