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22 November 2006 <br /> AGE-NC Project No . 95-0167 <br /> Page 8 of 15 <br /> concurrently with SVE to facilitate remediation of the smear zone. <br /> 5 . 1 . 5 . DURATION <br /> Cleanup periods for soil vapor extraction typically range from several months to several years . Based <br /> upon the plume size and the presence of clay-rich soil, an SVE cleanup period of 12 to 18 months <br /> is estimated. <br /> II <br /> 5 . 1 .6., ESTIMATED COST OF SOIL VAPOR EXTRACTION <br /> i 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 cost to <br /> operate, maintain, monitor and sample an SVE system could vary from $40,000. 00 to $ 100,000.00 <br /> per year. Maintenance costs can vary significantly, depending upon the specific unit utilized. <br /> However, periodic costs (including maintenance, electricity and supplemental fuel) can range from <br /> $ 12,000.00 to $30,000.00 annually. <br /> 5 .2. EX-SITU TREATMENT OF IMPACTED SOIL <br /> I <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 /> contaminated with gasoline. Off-site disposal generally involves the transportation of the impacted <br /> soil to a licensed treatment/disposal facility. <br /> I <br /> 5 .2. 1 . EXCAVATION <br /> i <br /> All of the mentioned methods of ex-situ treatment require excavation of the impacted soil, which <br /> is generally the fastest and most effective method for soil remediation. Once excavated, the impacted <br /> soil is generally stockpiled on-site for treatment or transported for disposal. If soil is treated on-site <br /> and the hydrocarbon concentrations can be reduced to concentrations set by the lead agency or to <br /> non-detectable concentrations, the soil can be used to backfill the excavation. If the <br /> hydrocarbon-impacted soil is disposed of off-site, material must be imported to backfill the <br /> excavation. <br /> Advanced GeoEnviron rental, Inc. <br /> f <br />