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Ism <br /> k ✓. <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 <br /> operating cost items associated with implementation of the <br /> alternative. Because the cost of an alternative is affected by soil <br /> volume, further information is required to accurately evaluate this <br /> criterion. In the following evaluation, the cost of an alternative was <br /> based on past experience and vendor quotes and should be used for <br /> 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 site. The soil remedial alternatives <br /> evaluated included those listed in the PAR guidelines. Due to site- <br /> specific conditions, some of these alternatives were not appropriate <br /> 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 /> . _fav_ atian <br /> Excavation consists of removal of the hydrocarbon-containing <br /> ai backhoe). <br /> soils <br /> from the site with conventional excavation equipment (e. <br /> Clean soil would be imported to backfill the excavated area. <br /> Excavation by itself is effective in removing the affected soils from the <br /> site to limit migration of the hydrocarbons. However, it is not <br /> effective in remediating the affected soils without further treatment <br /> or disposal. Excavation would therefore be appropriate as part of <br /> other alternatives, but will not be considered viable as a separate <br /> remedial alternative for the site. <br /> 6-2 <br />