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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 />01/09/2006 1547 <br />01/09/2006 1621 <br />Solid <br />Matrix Spike/ <br />Matrix Spike Duplicate Recovery Report - Batch: 720-4123 <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: 720-4123 <br />Analysis Batch: 720-4123 <br />01/09/2006 1547 <br />01/09/2006 1621 <br />Prep Batch: N/A <br />Prep Batch: N/A <br />010906012.D <br />5.05 g <br />10 mL <br />010906013.D <br />5.08 g <br />10 mL <br />Method: 8260B <br />Preparation: 5030B <br />Latest Chemstation <br />Latest Chemstation <br />720-1310-12 <br />720-1310-12 <br />Analyte MSD QualMS QualRPD LimitRPDLimitMSDMS <br />% Rec. <br />94 94 69 - 129 0 20Benzene <br />95 94 61 - 121 2 20Chlorobenzene <br />85 90 65 - 125 4 201,1-Dichloroethene <br />86 82 70 - 130 6 20Toluene <br />90 85 74 - 134 6 20Trichloroethene <br />Surrogate MS % Rec MSD % Rec Acceptance Limits <br />4-Bromofluorobenzene 150 161 60 - 140** <br />1,2-Dichloroethane-d4 116 133 60 - 140 <br />Toluene-d8 90 86 70 - 130 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 142 of 186