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4 PRIMARY REMEDIAL ACTION PROCESS AND SYSTEM <br /> DESCRIPTION <br /> This section describes the proposed remedial strategy for this facility Proposed remedial <br /> activities address hydrocarbon impacted groundwater and unsaturated soil through a phased <br /> approach <br />' Initial remedial actions will involve the application of air sparging and soil vapor extraction <br /> technology in the area considered to be the source of impact The focus of these initial <br /> actions will be to significantly reduce petroleum hydrocarbon concentrations in the source <br />' area by promoting volatilization and aerobic biodegradation Subsequent remedial actions <br /> will involve the monitoring of natural attenuation processes as they diminish the remaining <br />' petroleum hydrocarbon concentrations <br />' 4.1 Primary Remedial Actions <br /> Initial remedial actions will Include the installation and operation of an AS/SVE <br />' system The proposed remedial system consists of air sparging, soil venting, and <br /> vapor process treatment equipment Air sparging will promote significant removal of <br /> petroleum hydrocarbons through aerobic biodegradation and volatilization The <br /> contaminants of concern have favorable Henry's Law values as well as excellent <br /> biodegradability Soil vapor extraction will be utilized to recover fugitive vapors in <br /> the vadose zone <br />' Air will be infected at a depth of approximately 63 feet below ground surface (BGS) <br /> through air sparging well SP-1 Vacuum will be applied to the unsaturated zone <br /> through vent well VW-1 screened in the vadose zone Recovered vapors will be <br /> treated by carbon adsorption Drawings describing the proposed remedial system are <br /> included as sheets 1 through 6 in Appendix C of this report <br /> 1 <br /> Remedial Action Work Plan <br /> Prepared for THE EARTUGRA{NS COMPANY Prepared by Philip services Corp <br /> H 1ENV1624001451RAP61300 doc 10 8/31/00 <br />