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USA65 Pilot Test-Workplan <br /> The proposed vapor extraction will utilize the four monitor <br /> wells, MW8, S1, S2 and MW4 . The selection of S1 and S2 for the <br /> vapor extraction test is due to past contamination of ground <br /> water from these wells (both of these wells have been dry since <br /> 1991) . MW8 currently has elevated levels of hydrocarbon <br /> contamination to the ground water and MW4 has ' spotty` <br /> occurrences of petroleum hydrocarbon detection. The vapor <br /> extraction system for this test will utilize a regenerative <br /> blower and carbon canisters with a flow capacity of 75 cubic feet <br /> per minute (cfm) . A schematic of the Vapor Extraction unit is <br /> shown in Figure 4 . The carbon canisters are monitored regularly <br /> during the test to ensure that under no circumstances will <br /> untreated soil vapors be vented to the atmosphere . <br /> Equipment : <br /> EG&G Rotron Regenerative Blower, combined with two 200 lb. <br /> activated carbon canisters (Cameron-Yakima TSU 85) for <br /> an emmisions control system (see Figure 4) . <br /> 1 . Vacuum and flow: The system shall be capable of <br /> developing up to a maximum vacuum of 3 . 6" Hg. Flow rates <br /> shall be from 0 to 75 cfm. These conditions will depend <br /> on soil conditions . <br /> 2 . Emissions Control System: The effluent vapor stream is <br /> sent through two ' activated carbon' canisters . The stack <br /> emmisions of the last carbon is monitored for break <br /> thru' which will determine the end of the test . These <br /> carbon canisters will be monitored in the Meld by a <br /> portable chromatograph and/or a Hnu photoionization <br /> detector. <br /> 3 . One inch oriface plate capable of reading flows up to 100 <br /> cfm. <br /> 4 . On-site chromatograph, capable of determining micrograms <br /> per liter Benzene . Photovac lOS50 for field screening. <br /> 5 . Manometers, both mercury and water type for taking vacuum <br /> readings of the wells and the recovery system. <br /> PILOT TEST <br /> The pilot test will be performed by attaching a vapor extraction <br /> pump to one of the monitor wells and pumping the vapor from the <br /> well into an '.activated carbon canister' to control emissions . <br /> During the pilot test, the vapor stream will be repeatedly <br /> sampled, and flow rates and vacuum readings taken. The sample <br /> rate should be such as to show any significant changes in vapor <br /> 3 <br />