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- <br /> _ <br /> 7 <br /> fill that was placed from the to 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 /> Ambient air injection into wells MW2, MW4 MW5 <br /> EX does not <br /> seem. to have accelerated the recovery of�hydrocarbon dvapors, but <br /> should be forming a pressure high at those wells that should <br /> prevent the migration encroachment of other offsite plumes that <br /> maybe located in the area to the north and northwest of the site <br /> onto this site. <br /> Ground water baneath the site, located at monitor wells MW1 and. <br /> MW5 have been drastically reduced in contaminate levels. <br /> With the increase in ambient temperatures, the concentration's in <br /> the vapor stream has increased. <br /> CONCLUSIONS <br /> 1. Ground water contamination has been drastically reduced v <br /> vapor extraction. ia <br /> 2. Vapor extraction has created a potentiometric low at the <br /> ground water wells being utilized for vapor extraction (MWl 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 pl and EX has depleted those areas <br /> of recoverable gasoline range vapors. <br /> 5. The "Cyclo-Purge" unit can be utilized as a moisture drop <br /> that removes from the vapor stream the majority of water apor <br /> with minor hydrocarbons. Utilized as a carbon scrub rejuventor <br /> has be effective in a 45-50% removal of the absorbed weight <br /> produced from vapor extraction. <br /> 6. Ground water elevations.--are-continuing-to-decline. =-------- -�---- <br /> RECOMMENDATIONS <br /> 1• To continueuarterl <br /> 4 y ground water monitoring, update status <br /> reports will be submitted. twice yearly. <br /> page 23 <br />