Laserfiche WebLink
6. The DQA indicates that for Methods SW8081A, SW8141A and SW8270C the percent <br /> recoveries (%R) for CCVs exceeded the QC criteria. However, it was the %D that <br /> exceeded the QC criteria. Revise Appendix E to indicate the %D exceeded QC criteria <br /> on the CCV for all affected methods. <br /> 7. It is indicated in some of the DVRs (e.g., chlorinated herbicides by Method SW8151A) <br /> that there appear to be instances of linear regressions and quadratic equations being <br /> forced through the origin. However, the QAPP states that this is not allowed. Please <br /> revise Appendix E to indicate what affect this will have on the data, and clarify why these <br /> results do not appear to be qualified. <br /> 8. Field Work Variance (FWV) 70559-009R1 was referenced in Appendix E. However this <br /> document was not provided for review. Therefore, these comments were based on the <br /> assumption that data validation methods in the EPA guidance and the QAPP were <br /> followed. <br /> SPECIFIC COMMENTS <br /> 1. Section 5.4.2.1, Page 5-5: This section indicates that "in cases where one of the results is <br /> below the project quantitation limit (PQL), pairs of field duplicate results are considered <br /> in agreement if the absolute value of the difference between the result and the PQL is <br /> greater than the PQL". This statement appears incorrect. It appears the statement should <br /> read that if the absolute value of the difference is less than the PQL then the results are <br /> acceptable. Furthermore, Table 8-1 of the QAPP states that if an analyte is detected in <br /> one sample but not the duplicate then results should be qualified as J/UJ respectively. In <br /> addition, it appears that qualifiers for field duplicates that exceed QC criteria have not <br /> been listed in Table 5-1. Please revise Appendix E to clarify these discrepancies, to <br /> correctly qualify field duplicate results as per the QAPP and ensure result qualifiers <br /> appear in Table 5-1. <br /> 2. Section 5.4.3, Page 5-5: This section discusses instances where the laboratory PQL <br /> exceeded the cleanup goals. This section appears to incorrectly state that dieldrin PQLs <br /> were exceeded due to moisture content. According to the laboratory sample reports, it <br /> appears that the laboratory PQL, before moisture correction, is 3.0 micrograms per <br /> kilogram (ug/kg). However, according to Table 5-1, the cleanup goal is 2.0 ug/kg. Also, <br /> Table 5-8 appears to indicate that the cleanup goal was exceeded on one sample for <br /> dichlorophenoxyacetic acid. However, this is not discussed in Section 5.4.3. Please <br /> revise Appendix E to resolve these discrepancies. <br /> 3. DVR SDG 02-5942,Method SW8081, Section XII: This section indicates that column <br /> confirmations were within +/- 50%. However, according to Method SW8081 and the <br /> QAPP, the column confirmation requirement is +/- 40%. Please revise Appendix E to <br /> resolve this discrepancy, and ensure data is qualified appropriately. <br /> 2 <br />