PERMIT FILE - 9/3/2008, 9:15:35 AM-MR1

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Page 13 of 24 SOP NUMBER 28.0 Analytical Data Validation received per analysis type per sampling event/episode. If review of any of the laboratory performance parameters indicates a systematic problem may exist, that review parameter will be evaluated for all data packages from that laboratory for that sampling event/episode. Each of the subsections below describes in general how each laboratory performance parameter is evaluated. As noted in the introduction to Section 4, the hierarchy for criteria used to evaluate each parameter is as follows. A parameter is first evaluated against the requirements set forth in the quality assurance plan. If the quality assurance plan addresses that parameter, the parameter is evaluated against the requirements stated in the analytical method. If the method does not specify acceptance criteria, results for the parameter are compared to acceptance ranges based on laboratory historical data. While conducting the review described below, the data reviewer will evaluate whether the case narrative adequately summarizes all issues potentially affecting data quality (i.e., is the case narrative a reliable indicator of potential problems within the entire data package?). This assessment will be used to determine the need to evaluate specific laboratory performance parameters for the entire data set rather than just the predetermined portion of the data set (i.e., 10%). 4.2.1 Initial Calibration The requirements set forth in the quality assurance method, as applicable, will be used to evaluate whether: • The initial calibration was performed at the required frequency using the proper number of standards at the proper concentrations, • Whether the RL or CRQL is supported by the low point standard, • Whether adequate response was obtained for each analyte for each standard, • Whether the applicable linearity criteria were met, and • Whether the initial calibration was verified properly. If the initial calibration evaluation criteria for any analyte are not satisfied, then all results for that analyte associated with the initial calibration will be qualified as estimated (" PUJ" ). A qualifier code of "ICAL" or "ICY" will be used depending on whether the condition was due to the initial calibration or verification of the initial calibration. 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. 4.2.2 Continuing Calibration Verification The requirements set forth in the quality assurance plan and/or method, as applicable, will be used to evaluate whether: • The continuing calibration verification was performed at the required frequency using the proper standard at the proper concentration, • Whether adequate response was obtained for each analyte, and Powertech R Squared Inc Rev 28-1 JAB Attachment A 4/23/2007