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` JAN-18-'91 WED 12: 10 11 AX TECHNOLOGIES TEL NO:478 7; ] o <br /> yr #498 Pit <br /> Active Soil Bioremediation <br /> The major hazard associated with this remediation alternative is that <br /> water will be injected into the soil to provide oxygen to the soil <br /> microbes. The potential exists for impaction of the aquifer by <br /> hydrocarbons carried with the downwardly migrating water. Theprojected <br /> duration for this remediation alternative is 3 to 5 years. The length of <br /> this project duration is an environmental hazard in itself due to the <br /> potential for aquifer impaction by hydrocarbons that remain in the soil <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 /> hydrocarbon-impacted soil during periods of higher water table level , <br /> i .e. , 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 /> groundwater resources , , Implementation of this remediation alternative <br /> may obstruct achievement of this objective. <br /> COSTS FOR IMPLEMENTATION, OPERATION, AND MAINTENANCE OF REMEDIATION! <br /> ALTERNATIVES <br /> In-Situ Vapor Extraction Soil Remediation System <br /> The estimated cost for use of this remediation alternative is $50,000. <br /> i <br /> 4 <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 $200,000. <br /> RECOMMENDED REMEDIATION 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 /> Implementation of a vapor extraction soil remediation system and program. <br /> Vapor extraction provides the most effective remediation technology for <br /> the least cost and with the least amount of risk to the public, field <br /> technicians, and environment. Specifics of the recommended remediation <br /> alternative are given below. <br /> 14 - <br /> I <br />