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January 19, 1990 did not warrant changeout since the third reactor is solely for the -- purpose of trapping fugitive emissions from the first two reactors. The carbon in all three reactors became saturated on February 5, 1990 and was replaced February 12, 1990. Another carbon changeout was required on March 16, 1990. The rate of i carbon utilization is less than 20 pounds per day as of June 19, 1990. Thus, changeout of the carbon should not be required throughout the remaining remediation project using the existing wells. mm DISCUSSION Review of the monitoring data from start-up on January 5, 1990 to June 19, 1990, indicates that 90°/a of the gasoline contamination in the soils has been removed as vapor within the areas of influence of the monitoring wells located between the pump island and the underground tanks. The concentration of gasoline contaminants in the extracted soil vapors are much lower than initial readings and have progressively decreased confirming that vapor extraction is rapidly remediating the soil contamination. The dissolved gasoline constituents in +.he shallow groundwater should already be partitioning off of the shallow groundwater into the capillary fringe of the vadose zone where it is extracted as vapor. Fluctuations of the groundwater level in the upcoming summer months will expose more vertical fractions of the vadose zone and will further improve the groundwater quality. Continued operation of the VES until acceptable groundwater quality is achlaved is recommended. 4 VAPOR EXTRACTION TECHNOLOGY, INC.