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Analytical Results <br /> The results of OVA 128-GC monitoring of the concentration of gasoline vapors from <br /> the individual vapor extraction (monitoring and RW-1) wells are presented in Tables <br /> 1-4 The initial (start-up) and final (January 29, 1991) results of SKC carbon tube <br /> Ianalysis monitoring are found in Tables 6 and 7 respectively The OVA 128-GC <br /> monitoring of the carbon reactors influent and effluent is presented in Table 5 <br /> The extracted hydrocarobon concentrations ranged from an initial high of 6,800 ppm <br /> as methane in MW-1 during the first week of operation to less than detectable in MW-3 <br /> Ion August 14, 1990 All of the extracted vapor concentrations decreased a minimum <br />' of 98% of the original concentrations <br /> 10) These analytical data chart the progress of the remediation because the relative vapor <br />' concentrations and individual components of gasoline are reflective of the quantity of <br />' gasoline remaining in the soils and groundwater <br /> Activated Carbon Utilization <br />' The initial charge of 4,000 pounds of virgin 4 x 6 mesh activated carbon in reactors 1 <br />' and 2 were changed out and replaced with 4,000 pounds of virgin 4 x 6 mesh <br /> activated carbon on January 19, 1990 The carbon in all three reactors became <br /> saturated on February 5, 1990 and was replaced February 14, 1990 Another carbon <br />' changeout was required on March 16, 1990 The total carbon utilization at the site <br /> was 22,000 pounds The final 6,000 pounds of carbon was shipped for regeneration <br />' at Cameron Yakima in Washington following dismantling of the system on January 29, <br /> 1991 <br /> VAPOR EXTRACTION TECHNOLOGY, INC <br />