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October 21, 2004 Lab ID STK436814 <br /> Micheline Doyle Kipf Customer 3-14626 <br /> Quality Control - Inorganic <br /> Defituttvns <br /> Blank Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples <br /> LCS Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte <br /> recovery <br /> PDS Post Digestion Spike (ICP/GFAA) <br /> MS/MSD Matrix Spikes - A random sample is spiked with a known amount of analyte The recoveries are an indication o <br /> how that sample matrix affects analyte recovery <br /> BS/BSD Blank Spikes - A blank is spiked with a known amount of analyte It is prepared to verify that the preparation <br /> process is not affecting analyte recovery <br /> Dup Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate The relative percent <br /> difference is an indication of precision for the preparation and analysis <br /> CCV Continuing Calibration Verification - Analyzed to verify the instrument calibration is within criteria <br /> ND Non-detect - Result was below the DQO listed for the analyte <br /> DQO Data Quality Objective - This is the criteria against which the quality control data is compared <br /> Report continued on next page <br /> STK436814 Quality Control Page 2 <br />