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costs for the soils at the site would be approcimatelY $150 to $210 per <br /> cubic yard. In addition, landfilling does ref provide <br /> reddbyr treatment <br /> blict or <br /> affected soils, and therefore is not p leas been <br /> regulatory agencies. For these reasons, landfilling <br /> eliminated as an alternative. <br /> This atunsaturated so lsrwithout excavation.passive or ictive removal Passive soil <br /> vaporsafrom u erforated pipes into the <br /> venting would consist of the installation. of p <br /> arbon constituents to vent. <br /> affected site to so Isthe <br /> would likely notCrespond quickly enough t <br /> The specificIn active venting <br /> passive treatment due to their low perineabilil ed to the perforated <br /> (known as vapor extraction), a vacuum is app <br /> pipes to remove hydrocarbon-laden vapors from the eoilpores. <br /> vapors are then either treated (via an air stripe granular <br /> activated carbon unit)or released directly to the atmosphere. <br /> This soil treatment technology is implementable since it only <br /> requires the use of conventional drilling equipment and a vapor <br /> treatment unit. Vapor extraction has also been operating ven to bond tions. <br /> effective <br /> at num,rous sites and over a wide rang <br /> However,it may not be effective in the clayey, saturated soils found at <br /> the aecd <br /> oil i <br /> benea <br /> the <br /> the 1515 West a tmenttviaBvaporee tracf onssnotsfeasible(the <br /> water table, t <br /> technology would resulbe a the rnate for the 1325val of wateraWe West berasite if <br /> Vapor extraction may pP P <br /> the low <br /> the affected soils are above the water table. However, <br /> permeability of the clayey. soil ake thethe extraction process effective,process mo el wecult <br /> lls <br /> ells <br /> and time-consu <br /> would be required, increasing the cost of the alternative ($80 to $12 <br /> per cubic yard). Even with the additional wells, treatment in clayey <br /> soils may not be sufficient. For these reasons, vapor extraction is not <br /> a likely alternative for the site. <br /> Bioremediation is a treatment alternative ho affec[ be <br /> Would <br /> remediating soil affected by hydrocarbons. <br /> -- ------------ -- ---- - —-- --- --_- -------be excavated and-treated at the site. After treatment is complets: the <br /> clean soil would be backfilled into the excavation.-- -- - -- <br /> Several soil treatment <br /> bioremediation <br /> and composting.are available <br /> In land£arming, the <br /> landfarming, treatment , <br /> soil is spread out over the ground to a depth of ultural e 12 inches, moistened, <br /> quipment to <br /> water periodically tilled with conventional ag" en stimulates the <br /> provide aeration. The addition of ater and oxyg <br /> fro <br />