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Quality Control Results <br />Job Number: 720-1365-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />01/12/2006 1203 <br />01/12/2006 1236 <br />Solid <br />Matrix Spike/ <br />Matrix Spike Duplicate Recovery Report - Batch: 720-4302 <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: 720-4302 <br />Analysis Batch: 720-4302 <br />01/12/2006 1203 <br />01/12/2006 1236 <br />Prep Batch: N/A <br />Prep Batch: N/A <br />011206006.D <br />5.04 g <br />10 mL <br />011206007.D <br />5.12 g <br />10 mL <br />Method: 8260B <br />Preparation: 5030B <br />Latest Chemstation <br />Latest Chemstation <br />720-1365-31 <br />720-1365-31 <br />Analyte MSD QualMS QualRPD LimitRPDLimitMSDMS <br />% Rec. <br />101 100 69 - 129 3 20Benzene <br />100 101 61 - 121 1 20Chlorobenzene <br />87 89 65 - 125 1 201,1-Dichloroethene <br />98 99 70 - 130 0 20Toluene <br />99 100 74 - 134 1 20Trichloroethene <br />Surrogate MS % Rec MSD % Rec Acceptance Limits <br />4-Bromofluorobenzene 124 122 60 - 140 <br />1,2-Dichloroethane-d4 106 110 60 - 140 <br />Toluene-d8 102 102 70 - 130 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 77 of 89