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GEOMATRIX <br /> 5.0 CONCLUSIONS <br /> No TCE or other non-petroleum VOCs have been detected in the deeper soil samples or <br /> groundwater collected in the vicinity of the former drain pipe and TCE is therefore isolated to <br /> shallow soil in this area of the site. The lateral and vertical extent of petroleum hydrocarbon- <br /> affected soil on the subject property has been assessed. TPHd in downgradient groundwater <br /> samples were either non-detect or below water quality objectives. The presence of TPHg, <br />' <br /> benzene, and naphthalene detected in the groundwater sample collected from GMX-6 are likely <br /> from an off-site source and are not from residual crude oil originating from the OVP; GMX-6 <br /> was advanced adjacent to a former gasoline station. No other dissolved petroleum constituents <br /> were detected in the groundwater samples collected downgradient of the residual oil-affected <br /> soil; therefore, the residual petroleum in soil at the Welty Road site is not a significant source <br /> of dissolved petroleum constituents to groundwater. Geomatrix concludes that site <br /> characterization is complete. <br /> i <br /> 1 <br /> L•1pOC SAFE15000S1536d1SOlL GW RPTDOC 5 <br />