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Table 2 <br /> ELECTRON ACCEPTOR DATA <br /> Chemical parameters <br /> indicating conducive Typical Background <br /> Utilization Redox biodegradation Concentrations in <br /> Electron Factor(UF) (1) Potential(2) conditions(3) Metabolic Groundwater(4) <br /> Acceptor Process (9/9) (mV) (mgll) Products <br /> Oxygen Aerobic Respir'n 3 14 +800 DO>1 0 CO2,H2O 1 to 12 <br /> i <br /> Nitrate Denitrification 4 90 +750 DO<1 0(for all anaerobic) CO2,N2 or NO2 <1 to 100 <br /> Nitrate Reduction High Nitrate/Nitnte(<0 2) (>1 or 2 mg/L is <br /> likely due to <br /> human activity) <br /> Iron iron Reduction 41 10 Intermediate (5) Fez+>1 5 CO2,Fez+ <1 to 10 <br /> Nitrate<0 2 <br /> NH3>10 <br /> Sulfate Sulfate Reduction 460 -220 Nitrate<0 2 CO2,H2S, S03 1 to several <br /> Sulfite>0 2 HS hundred(rarely <br /> NH3>10 several thousand) <br /> Methane Methanogenesis 078 -240 Methane>1 0 CO2, CH4 0 to>1 (7) <br /> (for water)(6) Sulfate<40 <br /> Sulfite>0 2 <br /> Explanation NH3>1 0 <br /> DO Dissolved oxygen <br /> mV millivolts <br /> g/g grams of electron acceptor reduced per gram of benzene oxidized <br /> mg/L nulligrams per liter <br /> (1) Calculated for benzene after Wiedemeier et al, 1995 <br /> (2) Cookson, 1995 <br /> (3) Values are as a guideline only,after Cookson, 1995 <br /> (4) Hem, 1985 <br /> (5) Conditions for manganese reduction are slightly more aerobic than those for iron <br /> Dissolved Mn>O 2 mg/L indicative of Mn reduction <br /> (6) Methane is the utilizable indicator of methanogenesis but is an end-product For methanogenesls,the OF is <br /> the ratio of product produced(methane)to benzene degraded <br /> (7) Best assessed by wellhead gas measurement <br /> CLEARWATER GROUP(NATURAL ATTENUATION) revised October 3,2002 <br />