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1 <br /> 4�4 Petroleum Hydrocarbon Groundwater Plume <br /> iThe 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-MW5 had reportable <br /> concentrations of petroleum hydrocarbons Significant concentrations of TPH-gasoline and <br />' benzene were present to wells PT-MW 1, 2, 3, and 6 at concentrations above maximum <br /> contaminant levels (MCLS) Mucor concentrations of 1,2-DCA were reported to be present in <br /> monitoring wells PT-MW1 and PT-MW3 and 1,2-EDB was reported in a minor concentration in <br /> 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 /> I 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 has 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 /> 1 <br /> • <br /> M=\DlEnvmanmW\ParmuTexwG'RepmslQMR0123105 wpd 8 <br />