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Electron Acceptor/Metabolic Utilization Factor gm/gm <br /> By Product <br /> Oxygen 314 <br /> Nitrate 49 <br />' Manganese (II) 1102 <br /> Iron (II) 218 <br /> Sulfate 47 <br /> Methane 078 <br /> 6 For a given background concentration of an individual electron <br /> acceptor, the potential contaminant mass removal or "biodegradation <br /> capacity" depends on the "utilization factor" for that electron acceptor <br /> Dividing the background concentration of an electron acceptor by its <br />' utilization factor provides an estimate (in concentration units) of the <br /> intrinsic capacity of the aquifer by that mode of biodegradation <br />' The IBR capacity is measured as recommended in BIOSCREEN User's <br /> Manual (Version 12), Air Force Committee for Environmental Excellence <br /> Techrucal Protocol (April 1996) The IBR capacity (in mg/1) is <br /> Biodegradation Capacity (mg/L) = <br />' { (Average Upgradient Oxygen Conc ) - (Minimum Source Zone Oxygen <br /> Conc ) 1 / 314 <br /> + ( (Average Upgradient Nitrate Conc ) - (Minimum Source Zone Nitrate <br /> Conc ) 1 / 49 <br /> + ( (Average Upgradient Sulfate Conc ) - (Minimum Source Zone Sulfate <br /> Conc ) 1 / 47 <br /> + (Average Observed Dissolved Iron Conc in Source Area) / 218 <br /> + (Average Observed Dissolved Manganese Conc in Source Area) / 1102 <br /> + (Average Observed Methane Conc in Source Area) / 0 78 <br /> A-3 <br />