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December 19, 2006 Lab ID : STK639913 <br /> Luhdorff & Scalmanini, Consulting Eng. Customer : 3-12023 <br /> Quality Control - Inorganic <br /> Explanations <br /> 435 Sample matrix may be affecting this analyte. . Data was accepted based on the ,LCS or CCV recovery. . <br /> Definitions <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 /> 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 /> Dup. Duplicate Sample - A random sample with each batch is prepared and analyzed in duplicate. The relative pereent <br /> difference is an indication of precisionfor the preparation .and analysis. <br /> ICB Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br /> ICV Initial Calibration Verification - Analyzed to verify the instrument calibration is within criteria. <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 /> ,z <br /> STK639913: Duality Control Page 4 <br />