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September 12, 2003 Lab ID STK335002 <br /> Sierra Organics Co. Customer : 3-14810 <br /> Quality Control - Inorganic <br /> F <br /> 11 <br /> Method Blank - Prepared to verify that the preparation process is not contributing contamination to the samples. <br /> Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte <br /> recovery. <br /> ost Digestion Spike (ICP/GFAA) <br /> 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 /> CCB Continuing Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <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 /> STK335002: Quality Control Page 3 <br />