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Quality Control Results <br />Job Number: 720-915-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />12/13/2005 1420 <br />12/13/2005 1447 <br />Solid <br />Matrix Spike/ <br />Matrix Spike Duplicate Recovery Report - Batch: 720-3048 <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 />Injection Volume: <br />Column ID: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Injection Volume: <br />Column ID: <br />Client Matrix:Solid <br />Analysis Batch: 720-3048 <br />Analysis Batch: 720-3048 <br />12/13/2005 1420 <br />12/13/2005 1447 <br />Prep Batch: N/A <br />Prep Batch: N/A <br />5 g <br />10 mL <br />PRIMARY <br />5 g <br />10 mL <br />PRIMARY <br />Method: 8021B <br />Preparation: 5030B <br />N/A <br />N/A <br />GC 5 <br />GC 5 <br />720-915-12 <br />720-915-12 <br />Analyte MSD QualMS QualRPD LimitRPDLimitMSDMS <br />% Rec. <br />109 113 65 - 135 4 35Benzene <br />108 111 65 - 135 3 35Toluene <br />104 106 65 - 135 1 35Ethylbenzene <br />104 106 65 - 135 2 35Xylenes, Total <br />Surrogate MS % Rec MSD % Rec Acceptance Limits <br />a,a,a-Trifluorotoluene (pid)110 110 58 - 124 <br />4-Bromofluorobenzene 100 102 58 - 124 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 63 of 72