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July 29, 2003 <br />Chuck Hartman <br />Quality Control - Inorganic <br />Lab ID STK333648 <br />Customer : 3-15039 <br />Constituent <br />Method <br />Date/ID <br />Type <br />Units <br />Conc. <br />QC Data <br />DQO <br />Note <br />Metals <br />Vanadium <br />6010B <br />06/26/2003:A <br />05 -CCB <br />mg/L <br />ND <br /><0.01 <br />05-CCV <br />mg/L <br />0.5000 <br />101% <br />90-110 <br />06 -CCB <br />mg/L <br />ND <br /><0.01 <br />06-CCV <br />mg/L <br />0.5000 <br />100% <br />90-110 <br />Zinc <br />3050B <br />06/26/2003:A209 <br />Blank <br />mg/kg <br />ND <br /><1 <br />LCS <br />mg/kg <br />40.00 <br />112% <br />85-115 <br />PDS <br />mg/kg <br />40.00 <br />89.1% <br />75-125 <br />MS <br />mg/kg <br />40.00 <br />20.2% <br />75-125 <br />435 <br />(STK333591-01) <br />MSD <br />mg/kg <br />40.00 <br />62.4% <br />75-125 <br />435 <br />MSRPD <br />mg/kg <br />20.2% <br />520 <br />435 <br />6010B <br />06/26/2003:A <br />04 -CCB <br />mg/L <br />ND <br /><0.02 <br />04-CCV <br />mg/L <br />0.5000 <br />107% <br />90-110 <br />05 -CCB <br />mg/L <br />ND <br /><0.02 <br />05-CCV <br />mg/L <br />0.5000 <br />106% <br />90-110 <br />06 -CCB <br />mg/L <br />ND <br /><0.02 <br />06-CCV <br />mg/L <br />0.5000 <br />105% <br />90-110 <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 />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 />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 />Report continued on next page... <br />STK333648: Quality Control Page 5 <br />