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' GROUNDWATER REMEDIATION OPTION I Passive Groundwater Remediation-No Action, OPTION II Soil Vapor Extraction and Groundwater Pump and Treat, OPTION III Pump and Treat, and ' OPTION IV Well Inoculation and Low Flow Air Injection A cost-feasibility analysis for several remedial alternatives is included as Appendix G. 6.1 Soil Remediation ' 6 1 1 OPTION I - Passive Soil Remediation-No Action Passive soil remediation relies upon the principle that petroleum hydrocarbon compounds will ' naturally degrade or attenuate over time Such degradation and/or attenuation can be attributed in part to metabolic and co-metabolic processes occurring between indigenous microorganisms found in soil and the hydrocarbon compounds of concern Under proper circumstances, passive remediation ' can be an appropriate choice Sites with soils having adequate populations of petroleum hydrocarbon-degrading bacteria, nutrients, and oxygen levels may be a good choice for this alternative Additionally, sites m areas which pose little risk or threat for potential human contact may also be amenable to this alternative ' 6 12 OPTIOON II - Soil Vapor_Extraction With Off-Gas Treatment Soil vapor extraction (SVE) is a proven in-situ method for removing volatile organics from a soil ' matrix It uses vacuum wells to induce a flow of air through the soil to remove volatile compounds As air is pulled through the soil, contaminants are volatilized from both the soil and the water in the pore spaces The vacuum not only draws vapors from the unsaturated zone, but it also decreases the ' pressure in soil voids, thereby causing the release of additional volatile organic compounds (VOCs) The extracted vapor is either vented to the atmosphere, connected to a vapor phase carbon adsorption system, or thermally oxidized depending on the nature of the VOC impacted soil ' 6 13 OPTION III -In-Situ Bioremediation ' Biological processes for treatment of waste streams utilize microorganisms, principally bacteria, that can use contaminants as part of their metabolism By doing so, the microorganisms remove the contaminate from the waste stream or transform them into a benign form In anaerobic systems, oxygen and other inorganic oxidants are not present to serve as external electron acceptors in biochemical reactions The end result is, therefore, the conversion of complex organics to carbon dioxide and methane that are removed from the system in the form of biogas The microorganisms A 11528J1 ASA 15