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April 14, 2004 Lab ID STK431922 <br /> Valley Industries Customer : 3-11146 <br /> Quality Control - Inorganic <br /> Constituent Method Date/ID Type Units Cone. QC Data DQO Note <br /> Metals <br /> Vanadium 6010E 04/06/2004:A 004CV mg/L 1.000 99.1% 90-110 <br /> 01-CCB mg/L ND <0.01 <br /> 01-CCV mg/L 1.000 97.2% 90-110 <br /> 02-CCB mg/L ND <0.01 <br /> 02-CCV mg/L 1.000 98.8% 90-110 <br /> Zinc 3050B 03/24/2004:A209 Blank mg/kg ND <I <br /> LCS mg/kg 100.0 97.2% 85-115 <br /> PDS mg/kg 100.0 96.2% 75-125 <br /> MS mg/kg 100.0 84.8% 75-125 <br /> (STK431993-01) MSD mg/kg 100.0 54.1% 75-125 435 <br /> MSRPD mg/kg 33.7% 520 435 <br /> 3010A 04/02/2004:A207 Blank mg/L ND <0.1 <br /> LCS mg/L 10.00 102% 85-115 <br /> PDS mg/L 10.00 104% 75-125 <br /> MS mg/L 10.00 97.8% 75-125 <br /> (STK431922-01) MSD mg/L 10.00 99.0% 75-125 <br /> MSRPD mg/L 1.1% 520.0 <br /> 6010B 03/24/2004:A 01-CCB mg/L ND <0.02 <br /> 01-CCV mg/L 1.000 102% 90-110 <br /> 02-CCB mg/L ND <0.02 <br /> 02-CCV mg/L 1.000 104% 90-110 <br /> 04/06/2004:A 00-ICB mg/L ND <0.02 <br /> 00-ICV mg/L 1.000 103% 90-110 <br /> 01-CCB mg/L ND <0.02 <br /> 01-CCV mg/L 1.000 99.2% 90-110 <br /> 02-CCB mg/L. ND <0.02 <br /> 02-CCV mg/L 1.000 96.5% 90-110 <br /> Exphmations <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 /> ExBlk 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 /> 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 /> 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 /> 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 instnunent calibration is within criteria. <br /> ND Non-detect - Result was below the DQO listed for the analyte. <br /> <1f 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 /> STK431922: Quality Control Page 10 <br />