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VES OPERAT1®� r- The vapor extraction system began operation on January 5, 1990 utilizing all four \,apor extraction wells and four groundwater monitoring wells. For details of the VES construction please refer to our V,7porEXtPaCt10l1 SVSteM A7Stallatlon Report dated January 23, 1990. The initial vapor concentrations were relatively law and vaper development of these wells progressed through the next sixty hours to higher concentrations. All of the vapor wells (VP-1, VP-2, VP-3, VP-4) and groundwater monitoring wells MW-1, MW-3, MW-4, and RW-1 were sampled using a calibrated'SKC Pump with SKC Charcoal tubes. These samples were submitted to Superior Analytical Laboratory Inc. for analysis by NIOSH Method 1003/modified EPA Methods 8015 and 8020 for TPH as gasoline and STEK Results of these analyses are presented in Table 5. Vapor concenirations obtained in the field with the Foxboro OVA 128-GC were taken frim these wells and are reported in Table 1. After the first weed: of operation, the vapor extraction wells (VP-1, VP-2, VP-3, and VP- 4) were turned off line and used as vapor inlet wells on January 8, 1989 to increase the flow of gasoline vapors to the vapor extraction wells. This isolated MW-3 on its own blower further increasing the rate of vapor extraction from this well. For the next five months the VES operated with four (4) high capacity regenerative blowers on four groundwater monitoring/recovery wells (MW-1, MW-3, MW-4, and RW-1) using VP-1, VP-2, VP-3, and VP-4 as vapor inlet wells. 2 VAPOR EXTRACTION TECHNOLOGY. INC.