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3. Section 4.3.2.6, Page 4-6: The text states that the corrective action to <br /> be taken if the Laboratory Control Sample (LCS) does not meet the <br /> tolerance limits is to re-analyze the LCS or contact the contractor's <br /> project chemist. According the NFGs, "If the LCS criteria are not met, <br /> then the laboratory performance and method accuracy are in question." <br /> Since the laboratory performance and method accuracy are questionable <br /> when the LCS does not meet the tolerance limits and the entire data set <br /> may not be usable, please list specific actions that will be taken if <br /> the LCS criteria is not met (e. g., re-extract and analyze all samples <br /> and associated QC samples, or the project chemist will decide to qualify <br /> the data for just the associated analytes and state this in case <br /> narrative) . <br /> 4. Section 4.3.3.8, Page 4-9: The text does not indicate corrective action <br /> that would take place if contamination is found in the trip blank. <br /> According to the NFGs "If problems with anv blank exist, all associated <br /> data must be carefully evaluated to determine whether or not there is an <br /> inherent variability in the data, or if the problem is an isolated <br /> occurrence not affecting other data." For consistency with the NFGs, <br /> please include specific corrective action(s) that would occur if <br /> contamination in the trip blanks does occur (e. g. , qualify the data <br /> and/or discuss the trip blank contamination in the case narrative) . <br /> 5. Table 4-8, Page 4-34: Analytical methods, such as 8081A for pesticides, <br /> require second column confirmation. However, the QAPP does not include <br /> details on how samples will be identified to ensure similar data quality <br /> between laboratories. For example, the QAPP should specify that all <br /> methods requiring second column confirmation will be run, with <br /> appropriate QC on the second column, and the percent Difference (8D) of <br /> concentrations of samples run on each column should be reported in the <br /> data package. For consistency with the NFGs, please revise the QAPP to <br /> include the above-listed information. <br /> 6. Section 8.3.9, Page 8-4: This section refers to the duplicate samples <br /> that will be sent to the USACE MRL laboratory. The text states that <br /> "Any discrepancies identified by MRL will be resolved." However, the <br /> QAPP does not indicate how these discrepancies will be resolved and <br /> what, if any, corrective action will be taken. For completeness, please <br /> revise the QAPP to indicate how affected sample results will be <br /> reported, i.e. , how problems with the duplicate laboratory analyses will <br /> be tracked with the data reports to assure that decision makers are <br /> aware of potential data problems. <br /> 7. Table 8-1, Page 8-5: Please clarify how environmental samples will be <br /> flagged if the concentration of a compound detected in the sample is <br /> less than 5 times higher than the concentration of that compound in the <br /> method blank (10 times for common laboratory contaminants) . <br /> 3 <br />