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Intrinsic Bioremediation <br /> Groundwater Characterization° <br /> Parameter Objective Method <br /> Electron acceptors Used to calculate mass of - <br /> contaminant biodegraded <br /> Dissolved oxygen Preferred electron acceptor Field meter <br /> and/or HACH Winkler <br /> Field kit <br /> Nitrate Electron a=ptor SW9056 or EPA <br /> Method 300 <br /> Sulfate . Electron acceptor SW9056 or EPA <br /> Method 300 <br /> Sulfide Produced when sulfate is the SW 90301376.2 <br /> electron acceptor <br /> Ferrous iron (FE2+) Produced when ferric iron is the Filtration/EPA <br /> electron acceptor Method 200.7 <br /> Methane Produced when carbon dioxide ASTM D-2820, <br /> or acetate is the electron R.S. Kerr SOP-114 <br /> acceptor. <br /> Alkalinity (Carbonate and Indicators of contaminant EPA Method . <br /> biocarbonate) mineralization 310.2 <br /> Total Organic Carbon (TOC) Total groundwater organic SW9060 <br /> loading, mass balance <br /> BTEX Changes in concentration of SW8020 <br /> contaminants of concern <br /> Oxidation/reduction potential Confirmation of general redox Field Instruments <br /> state as determined from <br /> electron acceptor chemistry <br /> pH, conductivity, Standard water quality Field Instruments <br /> temperature parameters. Determination of <br /> pH especially important. <br /> I <br /> "This list is the "recommended minimum". Additional parameters could include chloride <br /> and cations for groundwater ion balance, and conservative tracers present in source material <br /> .(e.g. trimethyl benzene-in fuel). <br /> STL253/013.WP5 <br /> I . <br />