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April 14, 2004 Lab ID : STK431922 <br /> Valley Industries Customer : 3-11146 <br /> Quality Control - Inorganic <br /> Constituent Method Date/D) Type Units Conc. QC Data DQO Note <br /> Metals <br /> Thallium 3010A 04/02/2004:A207 Blank mg/L 0.057 <0.05 <br /> LCS mg/L 4.000 102% 85-115 <br /> PDS mg/L 4.000 105% 75-125 <br /> MS mg/L 4.000 98.8% 75-125 <br /> (STK431922-01) MSD mg/L 4.000 99.8% 75-125 <br /> MSRPD mg/L 1.0% 520.0 <br /> STLC 04/08/2004:A217 ExBlk mg/L -0.0013 0.0100 <br /> PDS mg/L 0.8000 <br /> ExDup mg/L 1.6 5.0 <br /> 6010B 03/24/2004:A 01-CCB mg/L ND <0.01 <br /> Ol-CCV mg/L 1.000 99.1% 90-110 <br /> 02-CCB mg/L ND <0.01 <br /> 02-CCV mg/L 1.000 99.1% 90-110 <br /> 03/3112004:A 03-CCB mg/L ND <0.01 <br /> 03-CCV mg/L 1.000 100% 90-110 <br /> 04-CCB mg/L ND <0.01 <br /> 04-CCV mg/L 1.000 99.1% 90-110 <br /> 05-CCB mg/L ND <0.01 <br /> 05-CCV mg/L 1.000 103% 90-110 <br /> 04/06/2004:A 00-ICB mg/L ND <0.01 <br /> 00-ICV mg/L 1.000 100% 90-110 <br /> 01-CCB mg/L ND <0.01 <br /> 01-CCV mg/L 1.000 99.2% 90-110 <br /> 02-CCB mg/L ND <0.01 <br /> 02-CCV mg/L 1.000 98.7% 90-110 <br /> 04/13/2004:A 01-CCB mg/L ND <0.01 <br /> Ol-CCV mg/L 1.000 103% 90-110 <br /> 02-CCB mg/L ND <0.01 <br /> 02-CCV mg/L 1.000 102% 90-110 <br /> Vanadium 3050B 03/24/2004:A209 Blank mg/kg ND <0.5 <br /> LCS mg/kg 40.00 96.5% 85-115 <br /> PDS mg/kg 40.00 102% 75-125 <br /> MS mg/kg 40.00 98.2% 75-125 <br /> (STK431993-01) MSD mg/kg 40.00 58.7% 75-125 435 <br /> MSRPD mg/kg 36.1% 520 435 <br /> 3010A 04/02/2004:A207 Blank mg/L ND <0.05 <br /> LCS mg/L 4.000 101% 85-115 <br /> PDS mg/L 4.000 106% 75-125 <br /> MS mg/L 4.000 99.9% 75-125 <br /> (STK431922-01) MSD mg/L 4.000 101% 75-125 <br /> MSRPD mg/L 0.9% 520.0 <br /> 6010B 03124/2004:A 01-CCB mg/L ND <0.11 <br /> Ol-CCV mg/L 1.000 98.9% 90-110 <br /> 02-CCB mg/L ND <0.01 <br /> 02-CCV mg/L 1.000 100% 90.110 <br /> 04/06/2004:A 00-ICB mg/L ND <0.01 <br /> Report continued on next page... <br /> STK431922: Quality Control Page 9 <br />