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Quality Control Results <br />Job Number: 720-1310-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />01/06/2006 1408 <br />01/06/2006 1412 <br />Laboratory Control/ <br />Laboratory Control Duplicate Recovery Report - Batch: 720-3949 <br />1.0 <br />1.0 <br />Solid <br />LCS Lab Sample ID: <br />LCSD Lab Sample ID: <br />Client Matrix: <br />Date Prepared: <br />Units: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Client Matrix:Solid <br />Date Prepared: <br />Units: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />mg/Kg <br />01/05/2006 1536 <br />Prep Batch: 720-3949 <br />Analysis Batch: 720-4011 <br />1.00 g <br />50 mL <br />1.00 g <br />50 mL <br />mg/Kg <br />01/05/2006 1536 <br />Analysis Batch: 720-4011 <br />Prep Batch: 720-3949 <br />Method: 6010B <br />Preparation: 3050B <br />N/A <br />N/A <br />Varian ICP <br />Varian ICP <br />LCS 720-3949/2-A <br />LCSD 720-3949/3-A <br />Analyte LCSD QualLCS QualRPD LimitRPDLimitLCSDLCS <br />% Rec. <br />9696 80 - 120 0 20Antimony <br />100102 80 - 120 2 20Arsenic <br />105107 80 - 120 2 20Barium <br />9698 80 - 120 2 20Beryllium <br />97100 80 - 120 3 20Cadmium <br />98101 80 - 120 2 20Chromium <br />9799 80 - 120 2 20Cobalt <br />100102 80 - 120 2 20Copper <br />9699 80 - 120 2 20Lead <br />106108 80 - 120 2 20Molybdenum <br />99101 80 - 120 2 20Nickel <br />100103 80 - 120 3 20Selenium <br />99101 80 - 120 2 20Silver <br />100103 80 - 120 2 20Thallium <br />99102 80 - 120 2 20Vanadium <br />9598 80 - 120 2 20Zinc <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 174 of 186