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6.0 Conclusions and Recommendations <br />Historical fuel storage and handling operations on the property of the Transmission Shop site <br />' resulted in contamination of onsite soil and groundwater with petroleum hydrocarbons, primarily <br />TPH-g and BTEX. Past remedial actions included the operation of an SVE system that had <br />removed several thousands of pounds of hydrocarbons from the vadose zone. Subsequent soil <br />r and groundwater investigations indicated that the bulk of the residual hydrocarbon mass was <br />below the groundwater table, confined in the area around the UST formerly located on the east <br />' end of the property. <br />Several proven treatment technologies were identified as potentially applicable alternatives to <br />address the petroleum hydrocarbon contamination at the site. The selection of the technologies <br />was based on the nature and approximate extent of the onsite contamination as currently <br />determined. After further evaluation and comparison of the technical effectiveness, <br />implementability, and cost effectiveness of the alternatives, biosparging is considered the most <br />applicable and appropriate alternative to address the onsite hydrocarbon contamination in the <br />subsurface. <br />Further delineation of the extent of the hydrocarbon contamination will be conducted at the site <br />in the near future. Findings from the delineation activities will be reviewed and incorporated <br />into this FS as appropriate. Pending any new findings, it is recommended that biosparging be <br />selected the treatment alternative for the site. <br />FS_OnsitePetroleum Hydrocarbon Remediation.doc 6-1 Shaw Environmental, Inc. <br />