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�• Quality Control Results <br /> Client: ATC Associates, Inc. Job Number: 720-737-1 <br /> Laboratory Control/ Method: 8260B <br /> Laboratory Control Duplicate Recovery Report- Batch: 720-2562 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-2562121 Analysis Batch: 720-2562 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsaturnwsldata12005121120305 <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 12/03/2005 0905 Final Weight/Volume: 10 mL <br /> Date Prepared: 12/03/2005 0905 <br /> LCSD Lab Sample ID:LCSD 720-2562120 Analysis Batch: 720-2562 Instrument ID: Varian 3900A <br /> Client Matrix: Water Prep Batch: NIA Lab File 1D: c:lsatumwsldata12005121120305\1 <br /> Dilution: 1.0 Units:ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 12/03/2005 0926 Final Weight/Volume: 10 mL <br /> Date Prepared: 12/03/2005 0926 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Quai LCSD Qual <br /> Benzene 101 95 69-129 5 25' <br /> MTBE 106 102 65-165 4 25 <br /> Toluene 105 100 70-130 5 25 <br /> . Surrogate_µ _ T^ LCS%Rec LCSD Rec Aoceptance Limits <br /> Toluene-d8 102 106 77-121 <br /> 1,2-Dichloroethane-d4 76 81 73-130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 11 of 13 <br />