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treatment or disposal of the hydrocarbons at the site This criterion <br /> also evaluates the uncertainties associated with the long-term <br /> reliability of the alternative <br /> The implementability criterion evaluates the ability of the alternative <br /> to be implemented based on technical and operating experience, <br /> physical site constraints, availability of services, and administrative <br /> limitations <br /> The cost criterion evaluates the major capital cost items and operating <br /> cost items associated with implementation of the alternative In the <br /> following evaluation, the cost of an alternative was based on past <br /> experience and vendor quotes and should be used for comparison <br /> purposes only <br />' The timeliness criterion evaluates the ability of the alternative to meet <br /> governmental or regulatory agency-imposed deadlines A remedial <br />' action may be required in a relatively short period of time, therefore, it <br /> must be possible to implement the selected alternatives within this <br /> time frame <br /> Identification and Screening of Soil Remedial Alternatives <br /> This section presents a description and evaluation of potential soil <br />' remedial alternatives for the two tank sites The soil remedial <br /> alternatives evaluated included those listed in the PAR guidelines <br /> Due to site-specific conditions, some of these alternatives were not <br /> appropriate for remediating the site The inappropriate alternatives are <br /> discussed only briefly The remaining alternatives were evaluated <br /> according to the four criteria described above <br /> Excavatisn <br />' Excavation consists of the removal of the hydrocarbon-containing soils <br /> from the site with conventional excavation equipment (e g , backhoe) <br />' Clean soil would be imported to backfill the excavated area Given the <br /> presence of confined ground water conditions at the site, some <br /> dewatering may be required during excavation activities if the <br /> t excavation approaches the depth of the silt-clay/sand contact A <br /> reduction in the thickness of the silt-clay layer overlying the saturated <br /> sand zone may result in a localized inducement of vertical ground <br /> water flow into the excavation <br /> 4-z <br />