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` <br /> 6. <br /> January 22, 2004 <br /> Lab ID : STK338235 <br /> Tom Newhall Customer : 3-15180 <br /> Quality Control - Inorganic <br /> LConstituent Method Date/1D Type Units Conc. QC Data DQO Note <br /> LMetalsZinc 6010B 01/15I2004:A 03-CCV mg/L 1.000 102% 90-110 <br /> Explanations <br /> 210 The method blank was positive. However, samples reported were either ten times greater than the blank <br /> L concentration or non detect and accepted. <br /> 220 The CCB was greater than the DQO. However, all results were either five times greater than the CCB <br /> concentration or ND relative to the PQL. <br /> 435 Sample matrix may be affecting this analyte. Dare 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 /> E%Blk TCLP/STLC Extraction Blank - Prepared to verify that the preparation process is not contributing contamination <br /> to the samples. <br /> LCS Laboratory Control Standard/Sample - Prepared to verify that the preparation process is not affecting analyte <br /> L 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 ul <br /> L how that sample matrix affects analyte recovery. <br /> ExDup TCLP/STLC Extraction Duplicate - A random sample with each batch is prepared in duplicate. The relative <br /> percent difference is an indication of precision for the preparation. <br /> ICD Initial Calibration Blank - Analyzed to verify the instrument baseline is within criteria. <br /> ICV Initial Calibration Verification - Analyzed to verify die instrument calibration is within criteria. <br /> L 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 Nan-detect - Result was below the DQO listed for the analyte. <br /> e iu 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 dam is compared. <br /> L <br /> L <br /> L <br /> L <br /> L <br /> L <br /> LSTK338235: Quality Control Page 5 <br /> L <br />