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' <br /> Major limitations to use of this alternative are the areal extent and <br /> depth to which it is physically possible to excavate. Excavation and <br /> removal of the soil can be achieved in approximately I month of field <br /> work. <br /> Active Soil Bioremediation <br /> � The major hazard associated with this remediation alternative he that <br /> water will be injected into the soil to provide oxygen to the soil <br /> The potential exists for impaction of the aquifer by <br /> microbes. <br /> hydrocarbons carried with the downwardly migrating water. The projected <br /> duration for this remediation alternative is 3 to 5 years. The length of <br /> this project duration is an environmental hazard in itself duuetothe <br /> l <br /> rs potential for aquifer isnpaction by hydrocarbons remaining in <br /> es <br /> during this time. These hydrocarbons may migrate down to groundwater <br /> level with the passage of time, or groundwater may come in contact with <br /> periods of higher water table level, <br /> hydrocarbon-impacted soil during <br /> during the winter months of a normal rainfall year. One of the <br /> objectives of the soil remedial program is to prevent contamination of <br /> tion of this remediation alternative <br /> groundwater resources. Implementa <br /> may obstruct achievement of this objective. <br /> COSTS FOR IMPLEMENTATION, OPERATION, AND <br /> MAINTENANCE OF REMEDIATION <br /> LTERNAT <br /> _. VES <br /> In-Situ Vapor Extraction Soil Remediation System <br /> _. The estimated cost for use of this remediation alternative is $50,000. <br /> Soil Excavation and Disposal <br /> The estimated cost for use of this remediation alternative is $600,000. <br /> The estimated cost is so great due to actual excavation costs and the <br /> cost to dispose of the soil at a Class I landfill . <br /> Active Soil Bioremediation <br /> The estimated cost for use of this remediation alternative is 5200,000. <br /> RECOMMENDED REMEDIA H ON ALTERNATIVE <br /> Upon consideration of the conditions at the project site; costs to <br /> implement, operate, and maintain the three remediation alternatives; and <br /> the risks associated with each alternative, EVAX recommends <br /> apor extraction soil remediation system and program. <br /> implementation of a v <br /> .'^. IO - <br /> r .ramie•.fci's7N1��RI�1111MfM17TIiIR�A1RIf1�1i111t�R11 L <br />