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Table i Summary of Analytical Methods for Geochemical Parameters Lincoln Center Stockton,California Analyte Lab Test Method- Sample Data Use Procedure Container Field Testing Methods flow-through Oxygen is consumed to create an anaerobic environment. dissolved oxygen field test kit cell Concentrations less than 1 mg/I generally indicate anaerobic conditions. Reductive conditions are more favorable for natural attenuation. oxidation reduction Influenced by the nature of biological degradation of contaminants. potential(ORP) field meter with ORP probe NA Depressed ORP indicates a reductive environment. pH,conductivity, flow-through temperature,and field test kit cell Monitors stabilization of parameters for sampling formation water. turbidity Laboratory Analytical Methods volatile organic EPA 8260B 40 ml VOA Primary analysis for assessing plume migration or changes. chemicals(VOCs) Sulfate is consumed under anaerobic conditions.Lower within VOC sulfate(as sulfur) EPA 300.0(IC) 100 ml plastic plume than areas outside of plume.Standard inorganic parameter measured in groundwater and a substrate for anaerobic microbial respiration.Required for calculating ion balance of groundwater. sulfide(as sulfur) EPA 376.2 100 ml plastic By-product of anaerobic activity.Presence indicates anaerobic environment. Nitrate is consumed under anaerobic conditions.Nutrient for nitrate(as nitrogen) EPA 300.0(IC) 100 ml plastic microorganisms during biodegradation.Required for calculating ion balance of groundwater. nitrite(as nitrogen) EPA 300.0(IC) 100 ml plastic By-product of anaerobic activity. Presence indicates anaerobic environment. ethene and ethane RSK 175 40 nil VOA By-product of dehalogenstion. Ferric iron is consumed under anaerobic conditions(calculated using total iron EPA 6010B 500 ml plastic the analytical result for ferrous iron).Standard inorganic parameter measured in groundwater.Predicts the possible extent of iron reduction in an aquifer.Required for calculated ion balance of groundwater. Manganese is consumed under anaerobic conditions.Standard inorganic manganese EPA 200.7 or 6010A 500 ml plastic parameter measured in groundwater.Required for calculating ion balance of groundwater. hydrogen GC/FID 40 ml VOA Hydrogen is an indicator of anaerobic activity.Helps determine which electron acceptors are active within an anaerobic environment. Notes: GC/FID = gas chromatograph/flame ionization detector mg/1 =milligrams per liter M = milliliter NA =not applicable VOA = volatile organic analysis Table adapted from U.S.Environmental Protection Agency(U.S.EPA 1998). wp-PhV_IRA-Sep07-tblsl-4-Oa750.xis/Pable 1-Geochem Parameters Page 1 of 1 9/11/2007