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� 4 <br /> . ARCADIS GERAGHTY&MILLER <br /> 2) Conversion of the SVE system to a bioventing system.This could be <br /> accomplished by modifying the current system to inject ambient air at a low <br /> flow rate into the SVE wells after groundwater recedes to approximately 13 <br /> feet bgs Bioventing would enhance the rate of aerobic msitu biodegradation <br /> of residual petroleum hydrocarbons by oxygenating the vadose zone and <br /> capillary fringe Due to the low influent vapor concentrations, bioventing <br /> can be implemented at the site more cost-effectively from a mass removal <br /> standpoint than continuing SVE system operation <br /> Please do not hesitate to call if you have any questions <br /> Sincerely, <br /> ARCADIS Geraghty &Miller, Inc <br /> Aaron O'Brien, CHMM <br /> Staff Engineer/Project Manager <br /> I <br /> i <br /> J <br /> ye qTa'ble <br /> E c President <br /> ent 1 SVE System Operational Parameters <br /> e 2 Air Sparging System Operational Parameters <br /> i <br /> our ref Page <br /> 80000309 0004!1 stgtr98 3/3 <br />