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y� <br /> fill that was placed from the 10 foot depth to the 25 foot depth, <br /> in the less permeable silts of the vadose zone. <br /> Vacuum influence measurements taken at wells EX and P1 indicate <br /> _ "- _that the vacuum extraction- from MW1 and MW5 will influence the <br /> vadose zone. <br /> air injection into wells MW2, MW4, MW6, P1 and EX does not <br /> o have accelerated the recovery of hydrocarbon vapors, but <br /> be forming a pressure high at those wells that should <br /> ent the migration encroachment of other offsite plumes that <br /> e located in the area to the north and northwest of the site <br /> 0 o this site. <br /> Ground water beneath the site, located at monitor wells MW3 and <br /> MW5 have been drastically reduced in contaminate levels. <br /> With the increase in ambient temperatures, the concentrations in <br /> the vapor stream has increased. <br /> CONCLUSIONS <br /> 1. Ground water contamination has been drastically reduced via <br /> vapor extraction. <br /> 2. Vapor extraction has created a potentiometric low at the <br /> ground water wells being utilized for vapor extraction (MW1 and <br /> MW5) . <br /> 3. A total of 6,891.9 pounds of gasoline range hydrocarbons have <br /> been removed from the vadose zone and ground water beneath this <br /> site. <br /> 4. Vapor extraction on wells P1 and EX has depleted those areas <br /> of recoverable gasoline range vapors. <br /> 5. Tk.0 "Cyclo-Purge" unit can be utilized as a moisture drop out <br /> that removes from the vapor stream the majority of water vapor <br /> with minor hydrocarbons. Utilized as a carbon scrub rejuventor <br /> has '-e effective in a 45-50% removal of the absorbed weight <br /> prodv ad from vapor extraction. <br /> 6. Ground water elevations are continuing to decline. <br /> a RECOMMENDATIONS <br /> 1. To continue quarterly ground water monitoring, update status <br /> r <br /> reports will be submitted twice yearly. <br /> page 13 <br /> a <br />