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' 4±4 Petroleum Hydrocarbon Groundwater Plume <br /> The areal or horizontal extent of the petroleum hydrocarbon groundwater plume at the site <br />' extended throughout the site All monitoring wells except PT-MW4 and PT-MWS had reportable <br /> concentrations of petroleum hydrocarbons Significant concentrations of TPH-gasoline and <br /> benzene were present in wells PT-MWt,3 and 6 at concentrations above maximum contaminant <br />' levels (MCL's) Significant concentrations of 1,2-DCA were reported to be present in <br /> monitoring well PT-MWL and PT-MW3 and 1,2-EDB was reported to be present in monitoring <br /> well PT-MW3 MTBE was reported to be present at low concentrations in PT-MW3 <br />' A review of past groundwater petroleum hydrocarbon concentrations was made and included in <br /> the tabulations presented in Table 4 No horizontal limit of the petroleum hydrocarbon <br />' contamination plume has been identified to date The past maximum areal extent of the <br /> groundwater petroleum hydrocarbon plume as determined from previous soil boring <br /> investigations suggest the site to have had a minimum areal extent of approximately 200 by 225 <br />' feet(45,000 square feet) We believe the plume to be somewhat larger in areal extent <br /> Figure 6 depicts the extent of the groundwater petroleum hydrocarbon plume at the site and the <br />' groundwater flow direction and gradient <br /> 1 <br />' 00 TP 8 <br />