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During the month of May 1990, the blower operating on MW-4 was switched to <br /> operate as a clean air injection blower manifolded to MW-9 and PW-1 to increase the <br /> radius of influence of the VES in the central area of the site, MW-4 was manifolded to <br /> the blower operating 1AW-3 and the vapor extraction wells (VP-1, Vf-2, VP-3, and VP- <br /> 4). The vapor extraction wells were turned back on to remediate this area more <br /> efficiently. After one month, there was no appreciable difference in the rate of <br /> rernediation using clean air injection. Therefore in June 1990, the system was <br /> reconfigured to its, original set-up with MW-4 manifolded to its, own blower and the <br /> vapor extraction wells turned off. <br /> During the summer months of July and August 1990, the groundwater <br /> isoconcentrations were no longer declining at a rate satisfactory to VET's <br /> expectations. This was probably a result of using the monitoring well as a vapor <br /> extraction well. As the operation of the VES progresses, the soils are remediated and <br /> the source of contamination becomes the gasoline partitioned off the surface of the <br /> groundwater. These vapors are focused into the extraction well which creates an <br /> equilibrium condition that exceeds the true groundwater contamination levels of the <br /> monitoring/extraction well causing either an artificial rise or a lack of decline in the <br /> monitoring well concentrations. Therefore, in early August, monitoring wells RW-1 and <br /> MW­3 were taken off the VES and switched to vapor inlet wells in order to monitor the <br /> true rate of remediation in the groundwater iso concentrations of these wells. <br /> Currently, the VIES operates with three blowers, one for MW-4, one for MW-i, and one <br /> on the remaining vapor point system which was reactivated October 3, '1990. <br /> 3 <br /> VAPOR EXTRACTION TECHNOLOGY, INC. <br />