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remove the hydrocarbon constituents and allow either reuse or <br /> disposal of the clean soil Examples of off-site treatment include <br /> recycling of the hydrocarbon-containing soil as a raw material in the <br /> production of road base material, low temperature thermal desorption, <br /> and soil fixation with reuse as daily landfill cover <br /> This alternative would effectively remediate the soils at the site and <br /> could be easily implemented However, the transportation costs <br /> associated with this alternative make it less cost-effective than equally <br /> effective available on-site treatment alternatives Therefore, off-site <br /> treatment alternatives are not presently considered as options for the <br />' site <br /> Landfilling <br /> This alternative involves the excavation of affected site soils and <br /> subsequent off-site disposal in an appropriate landfill The excavated <br /> area would be backfilled with clean material <br /> Although this alternative would be effective and could be <br /> implemented in a timely fashion, it is not cost-effective Landfilling <br /> costs for the soils at the site would be approximately $150 to $210 per <br /> cubic yard In addition, landfilling does not provide treatment of the <br /> affected soils, and therefore is not preferred by the public or regulatory <br /> agencies For these reasons, landfilling has been eliminated as an <br />' alternative <br /> Soil VcntinWYapor Extractio <br /> This alternative involves eitherP assive or active removal of soil <br /> vapors from unsaturated soils without excavation Passive soil <br /> rventing would consist of the installation of perforated pipes into the <br /> affected sods to allow the volatile hydrocarbon constituents to vent <br /> The specific site soils would probably not respond quickly enough to <br />' passive treatment due to their low permeability In vapor extraction, a <br /> vacuum is applied to the perforated pipes to remove hydrocarbon- <br /> laden vapors from the soil pores The vapors are then either treated <br /> (via an air stripper or granular activated carbon unit) or released <br /> directly to the atmosphere (with an approved air permit) <br /> This soil treatment technology is implementable since it only requires <br /> the use of conventional drilling equipment and a vapor treatment <br /> unit Vapor extraction has also been proven to be effective at <br /> numerous saes and over a wide range of operating conditions <br /> However, vapor extraction is only effective for affected soils above the <br /> 4-4 <br /> 1 <br />