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' General groundwater parameters of pH, oxidation-reduction potential (ORP or Eh), and <br /> • alkalinity are also valuable in assessing microbial respiration and the associated biodegradation <br />' of hydrocarbons <br /> To assess if hydrocarbons at the site are being biodegraded by microorganisms via either aerobic <br />' or anaerobic respiration, groundwater samples will be collected from upgradient and <br /> downgradient wells, and wells constructed in hydrocarbon-impacted groundwater during <br /> multiple quarterly groundwater monitoring events These samples will be analyzed for <br />' petroleum hydrocarbons, the above-mentioned reactants and products of aerobic and anaerobic <br /> respiration, and general groundwater parameters <br />' A list of these natural attenuation analytes and what can generally be inferred from them about <br /> biodegradation is presented below <br />' Analyte Lab/Field Biodegradation <br /> Method <br /> Aerobic Anaerobic <br />' Dissolved Oxygen Field Electron Acceptor <br /> Measurement <br /> Free Carbon Dioxide SM 4500-CO2 Product Product/Electron <br /> Acceptor <br /> Nitrate EPA 300 0 Electron Acceptor <br /> Nitrite EPA 300 0 Product <br /> • Sulfate EPA 300 0 Electron Acceptor <br /> Sulfide(dissolved) SM 4500 S213 Product <br /> Total Iron EPA 200 7 <br />' Fernc Iron EPA 200 7 Electron Acceptor <br /> Ferrous Iron Hach Co 8146 Product <br /> Manganese EPA 200 7 Electron Acceptor <br />' Methane, Ethane, Ethene RSK 175M Product <br /> H EPA150 1 /Field Altered Altered <br /> Oxygen-Reduction Field Highly+Potential Highly -Potential <br /> Potential Measurement <br /> Total Alkalinity SM 2320B Indicates Indicates bioactivity <br /> bioactivity <br /> This data set will provide further data to evaluate natural attenuation as a viable remedial <br /> alternative, assess if biodegradation, and the associated reduction of mass, is the dominant <br /> mechanism of natural attenuation at the site, and supplement data needed to assess if the mass <br /> degradation rate is sufficient for site conditions <br /> 5.2 PROPOSED PROJECT TASKS <br /> In addition to the investigation of vertical depth of groundwater impact presented previously in <br /> this work plan, the following tasks will be conducted in support of the proposed remedial action <br /> alternative <br /> IGNPMccu1739421MASTERIWP\VM3031WPtxdoc 23 <br />