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65 Soil Vapor Extraction <br /> The VET described herein was performed to evaluate the technical feasibility of employing in-situ <br /> vapor extraction at the site Vapor extraction has proven to be one of the most successful in-situ sol, <br /> treatment technologies for the removal of volatile compounds such as TPHg and BTEX from vadose <br /> zone soil In some cases where VES air flow contacts groundwater, varying degrees of groundwater <br /> ' restoration has occurred <br /> ' The results of the VET performed at this site indicated that vapor extraction is feasible and could <br /> provide an initial stark-up system TPHg mass extraction rate of approximately 300 ppd An effective <br /> ROI in excess of 80 feet (based upon a well VW-1 extraction flowrate of 100 scfm) could be <br /> ' established to capture petroleum hydrocarbons existing in on-site vadose zone and capillary fringe <br /> soil <br /> ' It is estimated that a 100 scfm therm-ox based VES operated for a 12 to 18 month period of time <br /> ' would be required to volatilize and capture the extractable TPHg mass in soil The estimated cost to <br /> construct, operate and maintain such a VES for a period of 24 months (including the purchase of a <br /> new therm-ox) ranges from approximately$90,000 to $125,000 <br /> i <br /> Project No S8100-06-18A -15- December 9, 1996 <br />