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Page 14 of 24 SOP NUMBER 28.0 Analytical Data Validation • Whether the responses obtained indicate that the instrumentation is still operating within an acceptable range (drift). If the continuing calibration evaluation criteria for any analyte are not satisfied, then all results for that analyte associated with the continuing calibration will be qualified as estimated ("J/UJ" ). A qualifier code of "CCV" or "CCAL" will be used for inorganic and organic methods, respectively. If the data reviewer can discern a probable magnitude and/or direction of bias to the associated sample results based on the information provided, then appropriate qualifier bias codes will be assigned. 4.2.3 Laboratory Control Sample Analysis Laboratory control samples (LCSs) are "clean" well-characterized samples used to monitor the laboratory's day-to-day performance of routine analytical methods. LCSs are prepared by spiking samples of a "clean" matrix with known amounts of target analytes and then processing the sample in the same fashion as all other samples. LCSs are used to monitor the accuracy and precision of the analytical process independent of matrix effects. The accuracy of the analytical process is evaluated using the calculated percent recoveries (%Rs) of the spiked analytes. The reviewer will verify that all target analytes were spiked into the LCS sample. The LCS percent recoveries will then be compared to the acceptance limits in the quality assurance plan, method, or laboratory historical limits (if the laboratory acceptance limits are considered to be comparable to those specified in the methods), as applicable. • If the LCS recovery for an analyte is greater than the upper acceptance limit, suggesting a potential high bias in reported results, all positive results for that analyte in all associated samples will be qualified as estimated ("J") whereas nondetect results will be considered acceptable for use without qualification because the high bias does not affect nondetect results. • If the LCS recovery for an inorganic analyte is less than the lower acceptance limit but >_30%, suggesting a potential low bias in reported results, positive and nondetect results for that analyte in all associated samples will be qualified as estimated ("J" or "UJ" ). • If the LCS recovery for an inorganic analyte is <30%, positive sample results will be qualified as estimated ("J"), whereas nondetect results will be qualified as unusable ("R") for all associated sample results. • If the LCS recovery for an organic analyte is less than the lower acceptance limit but >_10%, positive and nondetect results for that analyte in all associated samples will be qualified as estimated ("J" or "UJ" ). • If the LCS recovery for an organic analyte is <10%, positive sample results will be qualified as estimated ("J") whereas nondetect results will be qualified as unusable ("R") for all associated sample results. In the case of unacceptably low LCS recoveries, the reviewer will verify that the laboratory re- prepared and re-analyzed all associated samples; including the LCS and that acceptable results were obtained for the new LCS. Powertech R Squared Inc Rev 28-1 JAB Attachment A 4/23/2007