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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 1232 <br />01/06/2006 1236 <br />Solid <br />Matrix Spike/ <br />Matrix Spike Duplicate Recovery Report - Batch: 720-3972 <br />1.0 <br />1.0 <br />MS Lab Sample ID: <br />MSD Lab Sample ID: <br />Client Matrix: <br />Date Prepared: <br />Date Prepared: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Client Matrix:Solid <br />Analysis Batch: 720-4011 <br />Analysis Batch: 720-4011 <br />01/06/2006 0720 <br />01/06/2006 0720 <br />Prep Batch: 720-3972 <br />Prep Batch: 720-3972 <br />1.03 g <br />50 mL <br />1.00 g <br />50 mL <br />Method: 6010B <br />Preparation: 3050B <br />N/A <br />N/A <br />Varian ICP <br />Varian ICP <br />720-1310-38 <br />720-1310-38 <br />Analyte MSD QualMS QualRPD LimitRPDLimitMSDMS <br />% Rec. <br />89 95 75 - 125 9 20Arsenic <br />90 142 75 - 125 20 20 *Lead <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 177 of 186