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at concentrations of up to 8,500 ppb Benzene was found at concentrations up to 710 ppb The <br />distribution of petroleum hydrocarbons in groundwater beneath the site suggests that the lateral <br />' extent of impacted groundwater extends beyond the limits of the fuel farm site in a southwest <br />direction <br />4.2 Recommendations <br />' The data collected during this investigation identify but do not define the extent of soil and <br />groundwater impacted by petroleum hydrocarbons To define the extent of impacted soil and <br />1 groundwater, IT Corporation recommends an additional investigation be performed at the site <br />The additional site investigation should include soil and groundwater sampling using the <br />rGeoprobe DPT ng and the installation of at least three groundwater monitoring wells The <br />Geoprobe sampling locations should be positioned around the perimeter of the fuel farm site in <br />' an effort to define the extent of impacted groundwater, evaluate groundwater quality, and <br />identify locations for the installation of permanent monitoring wells <br />sAC/2-22-96/ENG/765436 11 <br />