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Quality Control Results <br />Job Number: 720-1051-1Client: Kennedy/Jenks Consultants <br />Date Analyzed: <br />Date Analyzed: <br />Dilution: <br />Dilution: <br />12/21/2005 1613 <br />12/21/2005 1644 <br />Laboratory Control/ <br />Laboratory Control Duplicate Recovery Report - Batch: 720-3359 <br />1.0 <br />1.0 <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 />ug/Kg <br />12/21/2005 1020 <br />Prep Batch: 720-3359 <br />Analysis Batch: 720-3419 <br />30.08 g <br />10 mL <br />PRIMARY <br />30.06 g <br />10 mL <br />PRIMARY <br />ug/Kg <br />12/21/2005 1020 <br />Analysis Batch: 720-3419 <br />Prep Batch: 720-3359 <br />Method: 8081A <br />Preparation: 3550B <br />N/A <br />N/A <br />No Equipment Assigned <br />No Equipment Assigned <br />LCS 720-3359/2-A <br />LCSD 720-3359/3-A <br />Analyte LCSD QualLCS QualRPD LimitRPDLimitLCSDLCS <br />% Rec. <br />111104 37 - 136 7 35Aldrin <br />115108 58 - 135 6 35Dieldrin <br />118112 58 - 134 6 35Endrin <br />114110 40 - 136 4 35Heptachlor <br />115110 55 - 132 5 354,4'-DDT <br />110104 37 - 137 6 35gamma-BHC (Lindane) <br />Surrogate LCS % Rec LCSD % Rec Acceptance Limits <br />Tetrachloro-m-xylene 91 99 50 - 125 <br />DCB Decachlorobiphenyl 99 106 46 - 142 <br />STL San Francisco <br />Calculations are performed before rounding to avoid round-off errors in calculated results. <br />Page 24 of 28