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-,, VES OPERATION <br /> The vapor extraction system began operation on January 5, 1990 utilizing all four <br /> vapor extraction wells and four groundwater monitoring wells. The initial vapor <br /> concentrations were relatively low and vapor development of these wells progressed <br /> through the first 72 hours to higher concentrations. All the vapor wells (VP-1, VP-2, <br /> VP-3, VP-4) and groundwater monitoring wells MW-1, MW-3, MW-4, and RW-1 were <br /> sampled using a calibrated SKC Pump with SKC Chercoal tubes. These samples were <br /> submitted to Superior Analytical Laboratory Inc. for analysis by NIOSH Method <br /> r- 1003/modified EPA Me thods 8015 and 8020 for TPH as gasoline and BTEX. Results <br /> of these analyses are presented in Tables 3 and 5. Vapor concentrations obtained in <br /> the field with the Foxboro OVA 128-GG were taken from these wells and are reported <br /> in Tables 1 and 2. <br /> i <br /> After the first week of operation, the vapor extraction wells (VP-1, VP-2, VP-3, and <br /> VP-4) were removed from service as vapor extraction wells and used as vapor inlet <br /> :veils to increase the flow of gasoline vapors to the vapor extraction wells. This <br /> isolated MW-3 on its own vacuum blower further increasing the rate of vapor extraction <br /> i <br /> from this well. For the next five months the `IES operated with four (4) high capacity <br /> regenerative blowers on four groundwater monitoring/recovery wells (MW-1, MW-3, <br /> - MW-4, and RW-1) using VP-1, VP-2, VP-3, and VP-4 as vapor inlet wells. <br /> During the month of May 1990, the vacuum blower operating on MW-4 was switched <br /> to operate as a clean air injection blower manifolded to MW-9 and PW-1 to increase <br /> 2 <br /> VAPOR EXTRACTION TECHNOLOGY, INC, <br />