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Project No S808b-06-02 <br /> ' May 5, 1995 <br /> ' 5 0 DISCUSSION OF REMEDIAL OPTIONS <br /> Environmental studies performed at the site indicate that a plume of petroleum hydrocarbons <br /> remains in soil beneath approximately 55% of the site extending to depths ranging from 25 to 43 <br /> ' feet bgs The site is currently used as a Togo's restaurant under lease from the current property <br /> owner Presented below are discussions of the remedial options typically employed for soil <br />' impacted with petroleum hydrocarbons <br />' 5 1 No Remediation Alternative <br />' Due to the proximity of the soil hydrocarbon plume beneath the southern portion of the site to <br /> groundwater, there exists the potential for the leaching of hydrocarbons from soil beneath the <br /> southern portion of the site to groundwater Leaching could result if a groundwater elevation rise <br /> oc,Lurs to the approximate depth of 43 feet bgs Such leaching would further degrade the current <br /> groundwater quality and could significantly increase the cost of site cleanup through the requirement <br />' for a groundwater remedtation system Due to the possibility of leaching beneath the southern <br /> portion of the site, the "no remediation" alternative will not be given further consideration <br /> 52 Excavation of Soil <br /> The removal of soil impacted with petroleum hydrocarbons would require extensive excavation <br />' beneath approximately 55% of the site to depths ranging from 25 - 30 feet bgs to approximately 43 <br /> feet bgs While specific cost estimates cannot be developed for this option due to the difficulty in <br />' evaluating the indirect cost impact to Togos, Geocon estimates that excavation would cost well in <br /> excess of 1 million dollars <br /> Specific economic and technical issues associated with th excavation include shutting down the Togo <br /> business for an extended period of time, the demolition and reconstruction (or the temporary <br /> -26- <br />