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LI <br />December 18, 2006 <br />SKS Enterprises <br />Quality Control - Inorganic <br />Lab ID : STK650257 <br />Customer: 3-13071 <br />Explanations <br />408 Matrix Spike(MS) or Post Digestion Spike(PDS) has no Acceptance Range (DQO) because of high analyte <br />concentration in the sample. Data was accepted based on the LCS or CCV recovery. <br />430 Post Digestion Spike (PDS) not within Acceptance Range (AR) because of matrix interferences affecting <br />this analyte. <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 />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 <br />how that sample matrix affects analyte recovery. <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 />< �/ High Sample Background - Spike concentration was less than one forth of the sample concentration. <br />DQO Data Quality Objective - This is the criteria against which the quality control data is compared. <br />STK650257: Quality Control Page 3 <br />