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7 w 3 PROPOSED REMEDIATION TECHNOLOGIES ' Air sparging and soil venting are proposed as the most applicable and cost effective methods of remediation of impacted groundwater at this facility. Hydraulic conductivity and grain size analyses performed on soil samples from the site indicate that ' the soil is amenable to air sparging and soil venting technologies. The Henry's constant, volatility, and biodegradation potential of the hydrocarbon compounds present in the subsurface also indicate that air sparging and soil venting are applicable technologies. It has also been Burlington's previous experience that when applicable, air sparging and soil venting are the most cost effective and efficient technologies available for remediating petroleum hydrocarbon -impacted soil and groundwater. 3.1 Air Sparging Air sparging is accomplished by injecting air through a well screened below the dissolved -phase contaminant zone within the saturated zone. The in3ected air bubbles migrate horizontally and vertically upward through the impacted zone. Volatile compounds are stripped by the sparged air and migrate to the vadose zone where they can be carried to the surface by a soil venting system. The high volatility and low water solubility of petroleum hydrocarbons makes removal through the vapor phase much more efficient than through groundwater pumping. Air sparging takes advantage of these properties as the dissolved -phase hydrocarbons are transferred from the dissolved to vapor phase. ' Air sparging also provides oxygen to the subsurface potentially increasing the affect of biological degradation of hydrocarbon compounds dissolved in groundwater and present in the soil matrix. Key requirements for effective implementation of an air sparging system include sufficient air permeability of the aquifer, 07/94/1213821125997/REM REP/1 7uly 1, 1994 9 26am