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M � LFR Inc. The samples for the above-listed analyses will be collected by diverting groundwater directly from the tubing that is discharging groundwater into the flow-through cell and into appropriate laboratory-supplied containers. The samples for the hydrogen analysis require a special sampling method that is described below. Table 2 provides a summary of the specific analytical testing method, sample container, and the data that each analytical method will provide for each of the proposed analyses. Samples for these analyses will be collected after the field parameters have stabilized ' for three successive readings to within the following value ranges: • pH: +/- 0.1 standard units • DO: +/- 10% • conductivity: +/- 3% • turbidity: +/- 10% • ORP: +/- 10 mV Each sample container will be capped, labeled, and placed in an ice-chilled cooler for transport to the analytical laboratories under standard chain-of-custody protocols. Laboratory-prepared trip blanks will be placed in the coolers with the samples to check for possible contamination of the samples during shipment. Duplicate samples will also be submitted for analysis. One duplicate sample will be analyzed for each sampling event, and one trip blank per cooler will be analyzed as a check for sample cross-contamination. These field quality control samples will be collected and analyzed in addition to the quality assurance/quality control procedures that are part of the standard program followed by certified laboratories. Groundwater samples for hydrogen analysis will be collected using the bubble-strip method (or equivalent), as described in the U.S. EPA's September 1998 "Technical Protocol for Evaluating Natural Attenuation of Chlorinated Solvents in Groundwater" (EPA/600/R-98/128). Before sampling begins, the special equipment necessary for hydrogen sampling will be obtained from Microseeps, a state-certified laboratory that specializes in the analysis of dissolved gases. 4.3.2 System Performance Metrics Three primary lines of evidence will be used to evaluate the overall effectiveness of the Phase V IRA: • TOC and TIC: The migration of organic carbon in groundwater (from dissolution of the edible oil) also can be measured as TOC (unfiltered samples) or dissolved organic carbon (DOC, filtered samples) at monitoring well locations. TOC is an indicator of organic substrate available for biodegradation processes. Based on LFR's experience at similar sites, TOC levels of 200 mg/1 or in the ERD barrier wp-PhV_IRA-W7-Final-06750.d=1fr Page 27