ARCHIVED REPORTS_SOIL MANAGEMENT PLAN

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GEOMATRIX . constituents detected on the site should not result in an adverse noncarcinogenic health effect(U.S. EPA, 1989). Therefore,based on this evaluation,the presence of residual petroleum constituents in soil and groundwater at the site does not pose an unacceptable human health risk to hypothetical future residents at the site,under the conditions evaluated. In addition,based on the conservative nature of the PEA evaluation,the presence of residual petroleum constituents in soil and groundwater should also not pose an unacceptable human health risk to future commercial and construction workers at the site. 6.0 CONCLUSIONS AND RECOMMENDATIONS Results of the investigation indicate that the lateral and vertical extent of petroleum hydrocarbon- affected soil on the subject property has been defined. Benzene,toluene,ethylbenzene,xylenes,and MTBE were not detected in any of the soil samples collected at this site. Several PAHs were tdetected at low concentrations in the four soil samples affected by residual petroleum. Low concentrations of two PAHs were detected in the grab groundwater sample collected beneath the affected soil;BTEX or MTBE were not detected. The potential health risk posed by the residual petroleum constituents detected in soil and �• groundwater at the site was evaluated based on the methodology presented in the Human Health Screening Evaluation section of the PEA. This evaluation indicates that exposure to residual petroleum constituents present in soil and groundwater should not pose an unacceptable health risk to hypothetical future on-site residents under the conditions evaluated. In addition,based on the conservative nature of the PEA evaluation,the presence of residual petroleum constituents in soil and groundwater should also not pose an unacceptable human health risk to future commercial and construction workers at the site. \\SF3\DEPTDATA\DOC_SAFE\SOOOS\5650\BURNS\BURNS SOILGW RPT.DOC 5