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i <br /> DEFINITION OF THE LA URAL AND <br /> VERTICAL EXTENT OF COMMINATION <br /> The lateral extent of soil contamination is zonfined within. a radius of <br /> approximately 120 ft. from the .leak source. This conclusion is based on <br /> the results of the laboratory analysis and field screening of samples taken <br /> during the drill process. The vertical exte t of soil contamination from <br /> surface to ground water is confined to an ar a immediately surrounding the <br /> storage tanks. However, some evidence of soil contaminatimn exists from <br /> the 35 ft, level to ground water with the 12D ft. radius. <br /> The results of the laboratory analysis of the ground water indicates that <br /> some contamination extends beyond the perimeter monitoring wells. However, <br /> subsequent analysis results have shown the concentrations of soluable <br /> hydrocarbons in the ground water are decreasing as a result of the ground <br /> water pumping and treatment. <br />