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Project No S8080-06-02 <br /> May 5, 1995 <br /> ' 2 10 Vapor Extraction Pilot Test <br /> IGeocon performed a one day onsite vapor extraction pilot test (VET) on December 9, 1994, to <br /> collect site specific data and evaluate the feasibility of using vapor extraction as a soil remediation <br /> ' alternative The VET had three main objectives (1) to measure the extraction rates that can be <br /> achieved from the vapor extraction wells, (2) to measure the hydrocarbon concentration of extracted <br />' vapors, and (3) to estimate an effective radius of influence for the vapor extraction wells for future <br /> engineering design <br /> The VET system consisted of a 1 5 horsepower Rotron 454 regenerative blower powered by a <br /> I portable 220V generator, one 200 pound granular activated carbon (GAC) bed, instrumentation for <br /> measuring process flowrate, vacuum and temperature, a diaphragm valve for extraction well flowrate <br /> selection and control and Dwyer Magnahelic" gauges to measure vacuum response in observation <br /> wells The VET system was connected to the various vapor extraction wells using flexible hose <br /> equipped with quick disconnect fittings <br /> Eight existing vapor extraction or groundwater monitoring wells were used as either extraction wells <br /> or monitoring points during the VET The location of these wells are shown on Figure 2 The <br /> blower was used to apply a vacuum to the vapor extraction wells and induce air flow through the <br /> subsurface earth materials Extracted hydrocarbon vapor was pumped through the GAC bed for <br /> treatment prior to ambient venting to the atmosphere Two separate tests were performed both on <br />' vapor extraction wells VW-1 and VW-6 Each test Iasted approximately 1 5 hours with selected <br /> flowrates ranging from 30 actual cubic feet per minute (acfm) to the maximum achievable <br /> Vacuum, temperature and flowrate data for the extraction well process flow was recorded every 15 <br /> minutes in addition to the vacuum response in the various monitoring points utilized <br />' Air samples were collected in opaque M lar air sample bags using a sample pump with '/4-inch <br /> Tygon-type tubing connected to a labcock sample port located between the extraction well and the <br /> E <br /> -14- <br /> f <br />