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associated with the blank are at least 10 times the calculated blank concentration . The laboratory <br /> must investigate the blank contamination to determine that positive blank results are not due to a <br /> laboratory error and report the affected samples and field -generated blank results with <br /> appropriate qualifiers and/or comments . <br /> 9 . If any quality control measure or calibration verification fails ( including those specified above) <br />, <br /> samples that are associated with the failure must be reanalyzed , if possible . Sample data that are <br /> associated with a failed quality control measure or calibration must be appropriately qualified as <br /> specified in Chapter 62- 160 , F .A. C . An explanatory comment must be attached to the final report for <br /> each result that has a qualifier code other than U , I , or A. Any additional qualifier codes used but not <br /> explicitly listed in Chapter 62- 160 , F .A. C . must be identified and defined in the report . <br /> 10 . The reported MDL and PQL for each sample must be adjusted for dilution factors and any relevant <br /> preparation weights and volumes . <br /> 11 . Field QC duplicates or replicates - The GRANTEE shall ensure that field duplicates (not to <br />be <br /> confused with laboratory duplicates) are analyzed . All field duplicate results greater than the <br /> contracted PQL should agree within 20% RPD for each measured analyte . In the event that field <br /> duplicate agreement is not observed , the laboratory must investigate sufficiently to determine that <br /> poor precision is not due to a laboratory error and report the results with appropriate qualifiers and/or <br /> comments . <br /> 12 . For all organic analyses using either gas chromatography or HPLC , analytes with concentrations <br /> above the method detection limit shall be confirmed by at least one of the qualitative identification <br /> measures listed below. Confirmation must occur the first time an analyte is detected at a sampling <br /> point. <br /> ► Second column/same detector <br /> ► Second column/alternate detector <br /> ► Same column/alternate detector <br /> ► Mass spectrometry <br /> ► Alternate wavelength <br /> Revised 3/05 <br /> DEP Agreement No . GO 143 , Attachment H, Page 10 of 11 <br />