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EVALUATION OF REMEDIATION TECHNOLOGIES Soil Remediation Alternatives :J Determining the most appropriate soil remediation technique for the subject site is based on several factors: l • extent of hydrocarbon impaction in the subsurface soil • availability of soil remediation equipment • a scheduled remediation period • cost-effectiveness Soil remediation can be achieved by the following methods: • excavation-and-disposal • soil-vapor extraction (SVE) • bioventing Excavation-and-disposal is a widely used remediation alternative for removing shallow areas of hydrocarbon-impacted soil, particularly from properties where available remediation time is limited. At Village West, hydrocarbon impaction in the subsurface soils appears to extend mainly from the vicinity of well MW-6 towards the condominium complex as impacted ground -< water migrates downgradient. Excavation-and-disposal is not recommended at Village West because of the availability of other remedial techniques which can accomplish the same goals without requiring demolition or alteration of existing improvements, or encroachment of Fourteen-Mile Slough, which would likely require costly shoring procedures to the levee. In-situ treatment involves either soil-vapor extraction (SVE) or bioremediation using bioventing and depends on four variables: • volatility of the fuel • soil type • economics • desired remediation time The depth of impacted soil and the high volatility of hydrocarbons indicate that both bioremediation and SVE are feasible means of source removal. Soil-vapor extraction is an efficient and commonly used process in remediating soils contaminated with volatile and semivolatile hydrocarbons. A typical system consists of a j vacuum blower attached to extraction wells completed in the vadose zone. The vacuum produced by the blower induces a pressure differential across the subsurface causing migration i W.W. Irwin, Inc. Project No. 33016.07 j December 1995 6 i " � 1