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1 <br />' 20 January 2005 <br /> AGE-NC Project No 97-0343 <br />' Page 12 of 21 <br />' 9 16 Estimated Cost of Soil Vapor Extraction <br /> The costs for SVE systems vary greatly,depending upon the particular system utilized for destruction <br />' of the extracted hydrocarbon vapor(thermal destruction, carbon adsorption, etc ) The total cost to <br /> operate,maintain, monitor and sample an SVE system could vary from$85,000 00 to $100,000 00 <br /> Maintenance costs can vary significantly, depending upon the specific unit utilized However, <br />' periodic costs(including maintenance,electricity and supplemental fuel)can range from$12,000 00 <br /> to $30,000 00 annually <br />' 92 EX-SITU TREATMENT OF IMPACTED SOIL <br />' Hydrocarbon-impacted soil can be excavated and treated on-site or transported off-site for <br /> recycling/disposal On-site treatment alternatives (ex-situ) include aeration, bioremediation, vapor <br /> extraction, and thermal destruction All are feasible methods for above-ground remediation of soil <br /> Icontaminated with gasoline and diesel fuel Off-site disposal generally involves the transportation <br /> ofthe impacted soil to a licensed treatment/disposal facility Excavation would necessitate disruption <br /> of normal site activities during excavation, backfilling and repaving <br />' 9 2 1 Excavation <br /> All of the mentioned methods of ex-situ treatment require excavation of the impacted soil, which <br /> I is generally an effective method for soil remediation Once excavated,the impacted soil is generally <br /> stockpiled on-site for treatment or transported off-site for disposal If soil is treated on-site and the <br /> hydrocarbon concentrations can be reduced to concentrations set by the lead agency or to non- <br /> detectable concentrations, the soil may be used to backfill the excavation If the hydrocarbon- <br /> impacted soil is disposed of off-site, material must be imported to backfill the excavation <br /> 9 2 2 Feasibility Of Excavation <br /> The vertical extent of petroleum hydrocarbon-impacted soil is in excess of 50 feet bsg Excavation <br /> of impacted soil to depths greater than 25 feet bsg would require specialized excavating equipment <br /> and excavating techniques Site excavation activities would also require the destruction of on-site <br /> I wells, which would necessitate monitoring well replacement at another time Other potential <br /> disadvantages of site excavation include significantly higher costs for deeper excavation and <br /> backfilling and continued liability for offsite disposal Future liability for off-site disposal could be <br /> reduced through indemnification offered by some soil recycling facilities <br /> IAdvanced GeoEnvironmental,Inc <br />