Laserfiche WebLink
' 01 June 1999 <br /> AGE-NC Project No 95-0137 <br /> Page 11 of 26 <br /> ' 18 months is estimated If the SVE is operated in conjunction with air sparging for ground water <br /> remediation, the duration of the SVE operation may be extended <br /> ' 5 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 cost to <br /> operate,maintain,momtor and sample an SVE system could vary from$40,000 to $75,000 per year <br /> Maintenance costs can vary significantly, depending upon the specific unit utilized <br /> ' 5 2 EX-SITU TREATMENT OF IMPACTED SOIL <br /> Hydrocarbon-impacted soil can be excavated and treated ex-situ on-site or transported off-site for <br /> ' recycling/disposal On-site treatment alternatives include aeration,bioremediation, vapor extraction, <br /> and thermal destruction All are feasible methods for above-ground remediation of soil contaminated <br /> with gasoline Off-site disposal generally involves transportation of the impacted soil to a licensed <br /> treatment/disposal facility <br /> ' 52 1 Excavation <br /> All of the mentioned methods of ex-situ treatment require excavation of the impacted soil, which is <br /> ' 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-sate <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 hydrocarbon- <br /> impacted soil is disposed off-site, material must be imported to backfill the excavation <br /> 5 2 2 Feasibility of Excavation <br /> ' Excavation of impacted soil followed b <br /> p y ex-situ treatment and/or disposal is a very effective method <br /> ' of remediation Theoretically, all or at least the majority of the impacted soil is removed Longer- <br /> chain hydrocarbons are also easily remediated with excavation, while In-situ methods are slower or <br /> are ineffective However, excavation costs can be excessive if the volume of the impacted soil is <br /> ' significant or if the vertical extent of soil impact exceeds 20 feet, resulting in requirements for <br /> special equipment or shoring, or if soil conditions require shoring <br /> AdVarnced GeoEm ironmental,Inc <br />