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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 mayor capital cost items and <br /> operating cost items associated with implementation of the <br /> alternative In the following evaluation, the cost of an alternative <br />' was based on past experience and vendor quotes and should be used <br /> for comparison purposes only <br />' The timeliness criterion evaluates the ability of the alternative to <br /> meet governmental or regulatory agency-imposed deadlines. A <br /> remedial action may be required in a relatively short period of time; <br />' therefore, it must be possible to implement the selected alternatives <br /> within this timeframe. <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 <br /> are discussed only briefly. The remaining alternatives were <br />' evaluated according to the four criteria described above. <br /> Excayadon <br /> Excavation consists of the removal of the hydrocarbon-containing <br /> soils from the site with conventional excavation equipment (e g , <br />' backhoe). Clean soil would be imported to backfill the excavated area. <br /> Given the presence of confined ground water conditions at the site, <br /> some dewatering may be required during excavation activities if the <br />' excavation approaches the depth of the silt-clay/sand contact. A <br /> reduction in the thickness of the silt-clay layer overlying the <br /> saturated sand zone may result in a localized inducement of vertical <br /> tground water flow into the excavation. <br /> Excavation by itself is effective in removing the affected soils from the <br />' site to limit potential migration of the hydrocarbons. However, it is <br /> not effective in remediating the affected soils unless further <br /> treatment or disposal is undertaken Excavation would therefore be <br /> 7-2 <br />