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i . OS May 1997 AGE-NC Project No 95-0173 iPage 15 of 29 ' 7 16 Estimated Cost Of Soil Vapor Extraction The costs for installation,operation and general maintenance of SVE systems varies,depending upon the particular system utilized for destruction of the extracted hydrocarbon vapors (thermal destruction, carbon adsorption, etc ) and the established cleanup goals The total cost to operate, sustain, monitor and sample a SVE system could vary from $40,000 00 to $100,000 00 per year 7 2 EX-SITU TREATMENT OF IMPACTED SOIL ' Hydrocarbon-impacted soil can be excavated and treated on-site or transported off-site for recycling/disposal On-site treatment alternatives (ex-situ) include aeration, bioremediation, vapor extraction, and thermal destruction All are feasible methods for above-ground remediation of soil contaminated with gasoline Off-site disposal generally involves the transportation of the impacted soil to a licensed treatment/disposal facility 7 2 1 Excavation All of the mentioned methods of ex-situ treatment require excavation of the impacted soil, which is generally an effective method for soil remediation Once excavated, the impacted soil is generally stockpiled on-site for treatment or transported off-site for disposal If soil is treated on-site and the hydrocarbon concentrations can be reduced to concentrations set by the lead agency or to non- detectable concentrations, the soil may be used to backfill the excavation If the hydrocarbon- impacted soil is disposed of off-site, material must be imported to backfill the excavation 7 2 2 Feasibility Of Excavation The site is currently undeveloped with no operations conducted at the site, which are favorable conditions for excavation Theoretically, all or at least the majority of the impacted soil could be excavated from the site However, excavation of hydrocarbon-impacted soil at the site, followed by ex-situ treatment and/or cJicpn,,al has a low feasibility at the site Special excavating equipment techniques would be re ment and required to reach impacted soil at greater depth Excavation of hydrocarbon-impacted soil at depths greater than 32 feet bsg (estimated depth to ground water) ' would require a ground water pumping system to facilitate the dewatering of the excavation Site excavation activities would also require the destruction of on-site wells.which may or may not have ' to be replaced at another time Other disadvantages of site excavation include limited site space, excessive costs for deeper excavation, excessive backfilling costs, continued liability for landfill • disposal and disruption of adjacent property businesses Future liability for off-site disposal can be Advanced GcoEnvironmeniai,Inc