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SITE REMEDIATION ACTIVITIES <br /> Limited vapor extraction operations were carried out at 305 South Hutchins Street The VES, <br /> consisting mainly of vapor extraction well VW-1, a suction blower, and a catalytic oxidizer, was <br /> operated by EPM between June 1993 and March 1994 Vapor extraction operations using the <br /> VES reportedly resulted in the removal of approximately 3,300 pounds of fuel hydrocarbons from <br /> beneath the southwestern portion of the site GEOCON estimated that about 500 cubic yards of <br /> soil beneath the southwestem portion of the site were remediated using the VES Following the <br /> operation of the VES, a soil sample from boring DTB1 was taken from 25 foot depth The sample <br /> contained no detectable fuel hydrocarbons or BTEX Before vapor extraction operations took <br /> place, a sample from the same depth in nearby borehole EB11 was found to contain 11,000 mg/kg <br /> of TPHg <br /> 7 <br /> Based on an averaa combin BTEX concentration of 50 mg/kg in soil, GEOCON estimated that <br /> about 168 pounds of BTEX still exists beneath the site GEOCON estimated that about 9000 <br /> pounds of TPH still exists beneath the site using an average TPH concentration of 1,600 mg/kg <br /> --T <br /> No zone of influence was calculated or measured for the VES that was operated at 305 South <br /> Hutchins Street GEOCON estimated that the zone of influence was about 25 feet in radius <br /> according to Figure 4 GEOCON estimates that a zone of influence of as much as 50 feet could <br /> be established in future soil vapor extraction operations,though there is no complete explanation of <br /> how the estimate was derived <br /> 8 <br />