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05 May 1997 <br /> AGE-NC Project No 95-0173 <br />' Page 16 of 29 <br />' reduced through indemnification offered by some soil recycling facilities <br /> Limited excavation within the core area at the site (the area of TPH-g concentrations greater than <br /> 1000 ppm) could be a more effective method of partial remediation to depths not exceeding 30 feet <br /> bsg This would result in the net removal of an estimated 25 to 50 percent of core-area, resulting in <br /> the net removal of approximately 200 to 400 cubic yards of core area impacted soil <br />' Pnor to any excavation of hydrocarbon-impacted soil at the site, it is likely that a substantial amount <br /> of"clean" soil would have to be removed for logistical reasons and either hauled off-site for disposal <br />' or hauled off-site for storage due to the limited space at the site <br />' 7 2 3 Estimated Costs For Excavation <br /> Once excavated, impacted soil could be treated on-site or transferred to an off-site disposal or <br />' recycling facility Replacement backfill material must be imported if offsite disposal is chosen <br /> Based upon limited site space, it is unlikely that on-site treatment would be acceptable The cost for <br /> 10 excavation, treatment/disposal and backfilling would likely be between $SO 00 and $120 00 per <br /> cubic yard, depending upon actual hydrocarbon concentrations encountered during excavation <br /> Additional soil remediation methods would have to be employed to remove hydrocarbons at greater <br />' depths <br /> 73 IN-SITU BIOREMEDIATION <br /> Acceptance of this treatment technology within the regulatory community has grown recently, due <br /> to documented successful remediation of petroleum-hydrocarbon contaminants at numerous sites <br /> in California <br />' 7 3 1 Principles <br /> For ln._ovt�r l�, ramArl�at�nn 1.—drnr�arlAnn_r�errrarlirNn lkar-tf, ire rtrnnarratArl in n linimi mPripim and <br /> al.a, vx`a} r...a uaaaa.vaa, , J...a,a.aaav . 5aa.a.aaab r—raab—' `1`""' <br /> infected into impacted soil via inoculation wells screened through hydrocarbon-impacted soil If <br />' ground water has been impacted, strategically located ground water monitoring wells can be used , <br /> for inoculation Once in the contaminant plume, the bacteria metabolize hydrocarbons and spread <br /> laterally and iArtw-ally bu mtrrrntinn nnrrll renrr%rh -ma rreatinrs an aduaani-inn remeAintinn frnnt <br /> M 1.J a.11M V1 a1V aa..J V, ....bau .as wa <br />' Hydrocarbon-degrading bacteria metabolize hydrocarbons and assimilate the material into biomass <br /> • for reproduction and growth, and release water and carbon dioxide as waste products The light-end <br /> Advanced GeoEnrironmeniai,Inc <br /> 1 <br />