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Geological Teckaics lac Page 12 <br /> BioventingBiosparging <br /> Pilot Test Work Plan <br /> Project No.770.2 <br /> June 9,2006 <br /> r <br /> 6.0 DUAL PHASE EXTRACTION TEST <br /> Soil vapor extraction and groundwater extraction are two proven technologies for the <br /> remediation of gasoline impacted sites. Dual phase extraction involves the use of high <br /> vacuum technology to simultaneously extract groundwater and soil vapor from one well. By <br /> inducing a cone of depression by extracting groundwater, additional vadose zone soil is <br /> exposed to vapor extraction. For the purpose of this pilot test, GTI proposes to utilize a <br /> mobile treatment unit for a period of one week. Extracted vapors will be treated with a <br /> thermal oxidizer and groundwater will be stored in a trailer and hauled off site for disposal. <br /> GTI will attempt to minimize groundwater extraction (except in MW-5) and apply the full <br /> vacuum to the vadose zone. <br /> As stated above a benefit of this test is to reverse any spreading caused by the bioventing and <br /> biosparging tests. <br /> V <br /> 6.1 Extraction Wells <br /> r The existing monitoring wells and new bioventing wells proposed above will be utilized. <br /> 6.2 Dual Phase Extraction System <br /> r <br /> The general process for dual phase extraction is as follows: <br /> ■ Extract vapors and water using a liquid ring vacuum pump. <br /> ■ Separate the influent vapors and water in a portable vacuum tank. <br /> ■ The contaminated vapor is then oxidized in a thermal oxidizer. <br /> ■ The captured contaminated groundwater is transferred to a tanker truck trailer via a high <br /> vacuum pump. The tank trailer will be emptied at regulator intervals by a licensed hauler <br /> for transportation to a waste disposal facility. <br /> ■ Collect data for actual vacuum flow and contaminant concentrations and temperature. <br /> ■ Delineate the area of influence from the applied vacuum and groundwater draw down <br /> through use of observation wells. <br /> 6.3 Equipment <br /> ■ A self contained trailer unit will be procured with liquid ring blower, water transfer tank, <br /> thermal oxidizer and control panel. <br /> ■ A temporary propane tank will be used as fuel for the thermal oxidizer unit. <br /> ■ Hoses will be used to connect the well heads to a manifold on the trailer input pipe. <br /> ■ A 4000 gallon tank trailer will be used to hold the extracted water and then it will be <br /> hauled off at periodic intervals to a licensed disposal facility. <br /> r <br />