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' 8 A 1995 2 April AGE-NC-95-0103 Page 9 of I l I5 2 2 FEASIBILITY OF EXCAVATION ' Excavation of impacted soil, followed by ex-situ treatment and/or disposal is a very effective method of remediation However, excavation is usually too costly, if tine volume of the impacted soil is high and/or the extent of the impacted soil would require special excavating equipment or Iextensive shoring I5 2 3 ESTIMATED COSTS FOR EXCAVATION The cost for excavation will ,ark, depending upon equipment to be used and -volume of impacted soil to be removed At the subject site, excavation would not likely be a Mable alternative because of the depth of the impacted soil Generally, excavation and treatmentldisposal usually costs between S45 00 and $95 00 per cubic %ard, depending upon concentrations of hydrocarbons ' Ho%%ever, these costs do not include special equipment or site conditions that may increase the filial cost Iy iN N/B1 -ENHANCE,\IENT 5 .31�1'-511 CI BIOREi IEDI�T10 0 Acceptance of this treatment technoloLl.\ by the regulatory community has s-zrown sonnewhat in recent year s as success has been denionsti ated at se\eral saes in Califoi nia and else\\Here 5 3 1 BASIC PRINCIPLES In this method, hydrocarbon-degrading microbes in liquid medlunl are inoculated through wells into the zone of contamination The mrciobes degrade hydrocarbons and spread laterally and ertically by mbar ating and reproducing, cl eating an advancing l enledlation front Hydrocarbon-degrading iluciobes are able to metabolize hydrocai boils and assimilate the resulting organic chemicals into biomass for reproduction and growth The light-end hydrocarbons are consumed fir st, followed by hea%ier compounds 5 3 2 NUTRIENT REQUIREMENTS AND TOXICITY U ' The mics obes i equire cei tain essential nutrients, which are usually available in native soil If supplements are needed, the arnlounts are genes ally very low, compai able to light agricultural use I