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TL 489-0589-02 Page 12 <br /> 6.0 EVALUATION <br /> The results of the laboratory' Y samples <br /> analyses of soil les <br /> P <br /> obtained during this RI from soil borings B-l . through B-4 were <br /> �i <br /> i' <br /> evaluated to. determine the presence of petroleum product <br /> constituents in shallow soils in .the reported vicinity of the <br /> former underground storage tank. In addition, the data obtained <br /> were evaluated to assess the potential environmental effects if <br /> petroleum product constituent's were detected in the shallow on-site <br /> soils. The details of Twining' s evaluation are presented in the_ <br /> .L following subsections. In addition, additional studies and <br /> remedial actions are discussed. <br /> 6. 1 Former Underground Storage Tarok: Assuming the bottom of <br /> the former underground storage tank was at a maximum depth of ten <br /> feet BSG, soil samples collected and chemically- analyzed at ten and <br /> 15 feet BSG should be sufficient in _identifying the presence of <br /> >i <br /> petroleum product constituents within the shallow soil stratas. 1 <br /> I <br /> However; the analytical results of the chemical. analyses of soil i <br /> samples S-1 through S-12 (collected at' five, ten., an& 15 feet BSG) <br /> from soil. borings B=1 through B-4 did not detect the presence of <br /> petroleum product constituents. Based on the -analytical data, the <br /> soils in the reported vicinity of the former - location of the <br /> underground storage tank do not appear to have detectable <br /> concentrations of petroleum product constituents. <br /> 6.2 Potential Environmental Effects: The primary potential . <br /> environmental effect of petroleum product migration is to the <br /> underlying groundwater. The chemical analytical results did not <br /> I <br /> Fresno Modesto Visalia Bakersfield <br /> i <br />