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Approximate Cost and Time Frame The approximate cost for implementation depends <br /> upon the volume of material excavated and treatment option Costs are estimated to be <br /> approximately $60 to $150 per cubic yard to excavate and treat petroleum-impacted soil <br /> and use the treated soil as backfill material If 1,000 cubic yards of material were <br /> generated, the anticipated cost may be $60,000 to $150,000 The time required vanes <br /> greatly with the alternative selected and may range from under 1 month to 1 year if ex <br /> situ bioremediation were selected. <br /> Soil Vapor Extraction <br /> Advantages SVE is most effective in coarse-grained soils where the radius of influence <br /> exceeds 100 feet <br /> Disadvantages SVE, suited to gasoline range hydrocarbons (cC 12), would not address <br /> the diesel range (C 10 to C22) hydrocarbon impacts present at the site Diesel fuel is the <br /> contaminant at this site SVE is not a practical remedial alternative given the low <br /> volatility of diesel fuel SVE would also require installation of SVE wells, trenching, and <br /> installation of subsurface piping to the extraction wells <br /> Approximate Cost and Time Frame The approximate cost to implement SVE includes <br /> feasibility testing, design, installation, and system operation and may range from <br /> $100,000 to $300,000 depending on period of system operation Operation may range <br /> from 6 months to 2 years <br /> Passive Bioventing <br /> Advantages The passive soil venting alternative represents a low-cost remediation <br /> alternative Air is transmitted laterally through the subsurface and replenishes oxygen to <br /> facilitate the biodegradation of the diesel range hydrocarbons Momtonng the subsurface <br /> oxygen levels is typically conducted to assist in determining modifications to the <br /> remediation program and provide respirometry data The air flow would replenish <br /> oxygen to the areas of petroleum-impacted soil, thus maintaining aerobic conditions. <br /> Petroleum hydrocarbon degradation rates are higher under aerobic conditions <br /> Department of Energy demonstration sites using similar technology include the <br /> Idaho National Laboratory, the Pacific Northwest Laboratory, and the Savannah River <br /> Laboratory Observed air flows at these case study sites ranged from 0 1 cubic feet per <br /> minute (cfm) to 7 cfm, and the resulting volumes of extracted air ranged from 110 to <br /> 2,400 cubic feet per day <br /> SACW IPM794127941000 ICS-Mcbell 8 fmcon <br /> E4 Rev 0,8/5/98 <br />