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' Report—Vapor Extraction/Air Sparge Remedial System Page 9 <br /> Fortner Manna Pro Site <br />' Project No 207 3 <br /> • September 26, 2003 <br />' 4.3 Vapor Extraction System <br /> P Y <br /> The process air is extracted from the ground using a previously installed Fuji 7-HP <br /> tregenerative blower or ring compressor capable of producing 250 SCFM at 10 inches of <br /> water vacuum, or 195 SCFM at 40 inches of water It is expected that at any given time <br />' three to four vapor extraction wells will be operated This will allow the wells to be <br /> "cycled" to maximize the overall efficiency of the vapor extraction In essence, as a <br /> given well's gasoline production declines to a low level, it will be taken off-line and <br />' replaced with another well As the first extractor is allowed to be idle, the gasoline- <br /> impacted sail that it serves will be partially recharged, and eventually the well will be <br /> returned to production Using this system, each well will be in a recharging state for <br />' about 2/3rds of the time and will be in active production for 113 of the time This method <br /> should allow the maximum feasible recovery of gasoline hydrocarbons <br />' 4.5 Air Sparge System <br /> A 7 5 horsepower Ingersoll Rand sparge compressor with a 60-gallon reserve tank was <br /> previously installed This compressor is capable of delivering at least 5 scfm to the face <br />' of 4 sparge wells simultaneously The normal operating manifold pressure is between 20 <br /> and 25 psig, which should result in pressure at the operating face of 5 to 10 psig The <br /> compressor was equippend with a new pressure regulator and accumulator and secondary <br /> filters <br /> 4.6 Carbon Filtration System <br /> fInitially, a single 12,000-pound carbon filter was installed to as the main vapor treatment <br /> device A smaller, 2,000-pound activated carbon filtration unit was also installed down- <br /> stream of the large unit and will be intended as a "polish" unit to remove and residual <br /> gasoline that may escape the main unit prior to discharge to the atmosphere <br /> Subsequently, it was found that excessive head space in the 12,000-pound unit was <br />' allowing blow-by The canister was then filled completely and now contains almost <br /> 17,000 pounds of activated carbon It is expected that is unit will become saturated with <br /> about 3,000 to 3,500 pounds of gasoline <br /> 2937 Veneman Ave,##B240 Geo-Phase Environmental Inc Phone(209)569-0293 <br /> Modesto, CA 95356 Fax(209)569-0295 <br />