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Mr. Jim Pinasco <br /> P;:ge 2 <br /> Section6 2 �age 6-6 It is stated that "QC data that do not meet <br /> established QC requirements will be rejected, and corrective <br /> action. . .will be taken. " What are these established QC <br /> requirements? As stated previously, the QAPP should define <br /> specific QA/QC objectives that must be met and should define <br /> exactly how QA/QC data that do not meet these specific QA/QC <br /> objectives will be used to qualify corresponding environmental <br /> sample data. <br /> Section 7 . 2 In the first paragraph the sentence that reads "a <br /> sample with high background levels" should be changed to read "a <br /> sample with high levels of interferences" . <br /> Section 8 . 1. 5. 1 and Section 8 . 1. 5. 2 Explain the rationale for <br /> not using the percent recovery from actual samples for <br /> purposes. In fact, using percent recoveries from actual samples <br /> Will yield more useful data than using only percent recoveries <br /> from "standard matrix" samples. The moving average percent <br /> recovery is not valid. The percent recovery should be compared <br /> to specific QC requirements and this comparison should be used to <br /> qualify environmental samples in the same lot. <br /> Section 8 . 2 . 1 This section should be rewritten to reflect <br /> comments made in previous section. <br /> Section 8 . 2 . 2 The moving average for accuracy and precision <br /> control is not valid. Accuracy and precision data should be <br /> compared to specific QC requirements and this comparison should <br /> lot. <br /> be used to qualify this <br /> samples in the corresponding <br /> Section 11. 1 Limits for accuracy and precision should be <br /> established prior to the analysis of any samples . <br /> Section 12 . 0 Corrective actions should be defined in relation to <br /> specific QC requirements. <br /> All! � <br /> Neal J. Navarro <br /> Environmental Assessment Unit <br /> Technical Services Unit <br />