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1 <br /> ' TABLE 4 <br /> Assessment Matrix of Soil Remediation Alternatives <br /> REMEDIATION TECHNICALLY COST LIMITATIONS AND <br /> OPTION FEASIBLE EFFECTIVE REMARKS <br /> Excavation YES YES Addresses soil contamination only <br /> of contaminated sods Used In conjunction with aeration or <br /> bioremediation Requires additional <br /> technology for ground water <br /> remediation <br /> On-site aeration YES YES Used in conjunction with excavation <br /> ' of excavated sods Addresses volatile components of <br /> contaminants in soil only Probably <br /> not permuted by air quality <br /> regulations <br /> Off-site treatment YES NO Cost prohibitive Does not address <br /> ground water problem <br /> Landfilling YES NO Cost prohibitive,long-term liability <br /> factor Does not address ground <br /> ' water problem <br /> Soil vapor extraction of NO NO Will require additional wells High <br /> volatile components from cost of operation due to tight sods <br /> sod, Field test indicates method not <br /> In-Situ feasible for TCS site <br /> Sod vapor extraction of YES YES Will require amendment of soils to <br /> volatile components from increase permeability <br /> soil, <br /> Ex-Situ <br /> Bioremediation of NO NO Low permeability of site soils makes <br /> contaminants in-situ bioremediation infeasible <br /> in-situ However natural biodegredation will <br /> occur over time Used in conjunction <br /> with other technologies <br /> Bioremediation of YES YES Ex-situ soil remediation can be cost <br /> contaminants effective Used best in conjunction <br /> ex-situ with other technologies <br /> ' Physical containment by NO NO Large area to be contained,may not <br /> installing a barrier around protect from vertical migration of <br /> contaminant plume contaminants Not cost effective <br /> Does not remove problem <br /> ' Neutralization of chemical NO NO Neutralization of petroleum <br /> compounds hydrocarbons not feasible <br /> Incineration of excavated NO NO Requires excavation Soil sterilized <br /> soils by process Relatively fast and <br /> ' complete remediation of soil Cost <br /> prohibitive <br /> Do nothing YES NO Contaminated soils continue to <br /> contaminate ground water, <br /> ' contributing growth of the ground <br /> water plume Unsatisfactory option <br /> from regulatory viewpoint Natural <br /> degradation of contaminants occurs <br /> but may take many years <br /> a <br /> i <br />! American Geological Services,Inc <br /> CA95DE-429 <br /> ' 16 <br />