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During the site visit on February 21, 1994, it was found that the <br /> the three new vapor wells did not produce sufficient vapor flow <br /> for operation of the system; therefore, MW5 was added to the <br /> vapor extraction system. <br /> With the low concentrations found in the wells further wells <br /> were hooked to the vapor extraction system <br /> The vacuum extraction system currently consists of two Rotron <br /> DR505 blowers pulling 64 . 86 cubic feet per minute (CFM) of soil <br /> vapor from the following wells : B3, VSB5, VSB9, VSB11, VSB13 , <br /> VS814, VSB15 and MW5 As of May 19, 1994 the system is removing <br /> 1. 09 pounds per day of TFH hydrocarbons and less than 0 . 01 pounds <br /> per day of benzene. <br /> CHRONOLOGY <br /> See prior reports for period from 03/31/92 to 11/30/93 <br /> 12/30/93 <br /> Collect influent and effluent samples of the system, and <br /> vapor samples from VSB5, VSB9, VSB11 and MW5 for analysis at <br /> WEGE laboratory. Flow rate 56 3cfm Turn off system. <br /> 1/01/94 - 2/15/94 <br /> System off . No vapor extraction being performed <br /> 02/1.6/94 <br /> System restarted, pumping only from three new vapor <br /> extraction wells, VSB13 , VSB14, and VSB15 . Collect vapor <br /> samples from VSB13 , VSB14 , and VSB15 <br /> 2/21/94 <br /> Add MWS to the vapor extraction system. Collect influent and <br /> effluent samples of the system, and vapor samples from <br /> VSB13 , VSB14 , VSB15, and MW5 for analysis at WEGE <br /> laboratory Flow rate 30 32cfm <br /> 3/23/94 <br /> Collect influent and effluent samples of the system, and <br /> vapor samples from VSB13 , VSB14 , VSB15, and MW5 for analysis <br /> at WEGE laboratory Flow rate 35 16 cfm <br /> 4/26/94 <br /> Collect influent and effluent samples of the system, and <br /> vapor samples from VSB13, VSB14 , VSB15, and MW5 for analysis <br /> at WEGE laboratory. Flow rate 18 50cfm <br /> page 2 of R604 , 06/06/94 <br />