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Quality Control Results <br />Job Number: 720-993-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />12/25/2005 1408 <br />12/25/2005 1443 <br />Solid <br />Matrix Spike/ <br />Matrix Spike Duplicate Recovery Report - Batch: 720-3639 <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: 720-3639 <br />Analysis Batch: 720-3639 <br />12/25/2005 1408 <br />12/25/2005 1443 <br />Prep Batch: N/A <br />Prep Batch: N/A <br />122505012.D <br />5.18 g <br />10 mL <br />122505013.D <br />5.09 g <br />10 mL <br />Method: 8260B <br />Preparation: 5030B <br />Latest Chemstation <br />Latest Chemstation <br />720-993-7 <br />720-993-7 <br />Analyte MSD QualMS QualRPD LimitRPDLimitMSDMS <br />% Rec. <br />102 102 69 - 129 2 20Benzene <br />97 98 61 - 121 2 20Chlorobenzene <br />88 87 65 - 125 1 201,1-Dichloroethene <br />97 96 70 - 130 0 20Toluene <br />92 92 74 - 134 2 20Trichloroethene <br />Surrogate MS % Rec MSD % Rec Acceptance Limits <br />4-Bromofluorobenzene 130 132 60 - 140 <br />1,2-Dichloroethane-d4 122 118 60 - 140 <br />Toluene-d8 105 106 70 - 130 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 108 of 141