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� I <br /> V <br /> Project No 58080-06-02 <br /> May 5, 1995 <br /> 1 <br /> 4 5 Vapor Extraction Pilot Test <br />' Results of the VET indicate that at extraction flowrates ranging from 30 to 70 acfm, an effective <br /> radius of influence of 50 to 100 feet can be expected Data indicates that the maximum expected <br />' wellhead vacuum will not exceed approximately 30 - 50 inches of water column <br />' Based on an effective radius of influence of 50 feet at a flowrate of 30 acfm, a combination of some <br /> of the six existing vapor extraction wells should provide vacuum influence for the onsite and offsite <br />' portions of the vadose zone petroleum hydrocarbon plume The estimated vacuum response at a <br /> distance of 50 feet from an extraction well operating at 30 acfm ranges from 0 6 to 1 25 inches of <br />' water column <br /> Vapor samples collected during the test were analyzed for TPHg and BTEX in order to evaluate the <br /> expected mass removal rate for a soil vapor extraction system (VES) Calculations indicate that <br /> approximately 100 pounds per day of TPHg per well will be extracted at the time of VES start-up <br />' Based on expected start-up vapor concentrations in excess of 35,000 mg/m3, a thermal oxidizer <br /> should be initially used to provide for the treatment and atmospheric discharge of extracted soil gas <br /> 1 I <br /> V I 1 <br /> ' I <br /> II <br /> -25- <br /> I <br /> 1 V <br />