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1 <br /> ' 2.5.3 Supplemental Sampling Results <br /> ' Bromate, CrVI and acetone were reported at similar concentrations throughout the pilot testing <br /> activities, with no increasing concentration trends evident as a result of ozonation. The supplemental <br /> ' sampling results of the OS testing are presented in Table 4. <br /> 2.5.4 Quality Assurance/Quality Control <br /> The field QA/QC implemented for the OS pilot test included the collection and submittal of one <br /> duplicate groundwater sample during each groundwater monitoring event. The duplicate samples were <br /> ' collected randomly from selected wells and labeled as either MW-14, a non-existent monitoring well, <br /> or mistakenly labeled after the preexisting well, MW-12. Well MW-12 was not sampled for the entire <br /> ' duration of the pilot testing and any references to MW-12 in the Well Sampling Data Sheets and <br /> laboratory analytical data included herein refers specifically to one or more field duplicates. When <br /> comparing the results of primary samples with their respective duplicate samples, each of the analyzed <br /> ' contaminants were reported at the same or similar concentrations for each of the duplicate samples, <br /> thus showing good repeatability. <br /> We also reviewed the QA/QC data provided with the MTL, BSK and CLS analytical laboratory <br /> reports. These data show acceptable surrogate recoveries and non-detect results for each of the method <br /> blanks and acceptable recoveries and relative percent differences for each of the matrix spikes and <br /> matrix spike duplicates. Appropriate recoveries were noted for each of the laboratory control samples. <br /> Based on the field and laboratory QA/QC data, no qualification of the data presented herein is <br /> necessary, and the data are of sufficient quality for the purposes of this report. <br /> II <br /> 1 <br /> �I <br /> 'I <br /> II <br /> 'I <br /> Project No.59183-06-02 - 8- July 2,2009 <br />