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CALIFORNIA WATER U <br /> Y QUALITY ASSURANCEMUALn-MONTROL <br /> MANAGEMENT SUMMARY <br /> (Contlnued) <br /> Confirmations <br /> During organic analysis, all positive compounds without an established baseline <br /> are confirmed by a secondary GC column or by GC/MS (accepting those compounds <br /> quantitated by pattern recognition. i.e.. PCBs and gasoline.) <br /> Heid QC Samples <br /> Travel blanks and pump/bailer blanks are analyzed only if the associated samples <br /> contain analytes of interest or if results e,cceed historical baseline data. <br /> DATA QUALITY ASSESSMENT AND REPORTING <br /> if all data fall within acceptable QC criteria, all calculations have been verified for <br /> accuracy, and all instrumental calibration data are within acceptable range, the data <br /> are passed as valid. In the event QC does not meet criteria, an immediate review of <br /> all raw data is conducted to determine the source of the discrepancy. If calculations <br /> are correct and instrument data (i.e.. calibration standard response, etc.) are <br /> w acceptable. the results are reviewed to evaluate the potential chemical interferences. <br /> if it is determined that interferences are present, a revised or alternate method of <br /> analysis may be selected and the samples rerun. If it is determined that there is no <br /> other apparent reason for the QC data discrepancy, the samples must be reprepared <br /> and reanalyzed. <br /> All results are reviewed by a supervising chemist prior to final report preparation. <br /> and all Snal reports are reviewed and authorized by a lab director. <br /> The client must specify the level Iof QA/QC reporting required in the results of <br /> analysis prior to beginning the analysis. USEPA Contract Lab Program equivalent <br /> data packages can be arranged through the laboratory Quality Assurance Manager. <br /> For Further Information Contact: <br /> Ms. Gloria Poling <br /> Manager Quality Assurance <br /> Cafifornla Water Labs <br /> Post Office Box 4249 <br /> Modesto, CA 95352 <br /> (209) 527-40.50 <br /> b <br />