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Quality Control Results <br />Job Number: 720-1326-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />01/18/2006 1448 <br />01/18/2006 1448 <br />Laboratory Control/ <br />Laboratory Control Duplicate Recovery Report - Batch: 720-4594 <br />100 <br />100 <br />Solid <br />LCS Lab Sample ID: <br />LCSD Lab Sample ID: <br />Client Matrix: <br />Date Prepared: <br />Units: <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 />Date Prepared: <br />Units: <br />Instrument ID: <br />Lab File ID: <br />Initial Weight/Volume: <br />Final Weight/Volume: <br />Injection Volume: <br />Column ID: <br />mg/Kg <br />01/17/2006 1200 <br />Prep Batch: 720-4594 <br />Analysis Batch: 720-4597 <br />4 g <br />10 mL <br />PRIMARY <br />4 g <br />10 mL <br />PRIMARY <br />mg/Kg <br />01/17/2006 1200 <br />Analysis Batch: 720-4597 <br />Prep Batch: 720-4594 <br />Method: 8021B <br />Preparation: 5030B <br />N/A <br />N/A <br />GC 5 <br />GC 5 <br />LCS 720-4594/6-A <br />LCSD 720-4594/7-A <br />Analyte LCSD QualLCS QualRPD LimitRPDLimitLCSDLCS <br />% Rec. <br />9797 77 - 123 0 35Benzene <br />104103 78 - 122 0 35Toluene <br />101101 70 - 130 0 35Ethylbenzene <br />104102 75 - 125 2 35Xylenes, Total <br />Surrogate LCS % Rec LCSD % Rec Acceptance Limits <br />a,a,a-Trifluorotoluene (pid)100 108 58 - 124 <br />4-Bromofluorobenzene 102 102 58 - 124 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 63 of 69