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{ <br /> 1 <br /> Quality Control Results <br /> Tient: San Joaquin Company Inc Job Number: 720-4654-1 <br /> . F <br /> Matrix Spike! Method: 8260B <br /> Matrix Spike Duplicate Recovery Report -Batch: 720-11403 Preparation: 5030B <br /> MS Lab Sample ID: 720-4654-1 Analysis Batch: 720-11403 Instrument ID: Varian 3900E <br /> � p <br /> Client Matrix: Water Prep Batch: td1A Lab File ID: c:Ivarianwsldata1200607V <br /> Dilution: 1.0 Initial WeightlVolume: 10 mL <br /> Date Analyzed: 07/27/2006 1455 Final Weight[Volume: 10 mL <br /> Date Prepared: 07/27/2006 1455 <br /> ' MSD Lab Sample ID: 720-4654-1 Analysis Batch: 720-11403 Instrument ID: Varian 3900E <br /> { Client Matrix: Water Prep Batch: IIIA Lab File ID: c:Ivarianwsldata1200607\W <br /> Dilution: 1.0 Initial WelghtfVolume: 10 mL <br /> Date Analyzed: 07/27/2006 1516 Final WeightfVolume: 10 mL <br /> {- Date Prepared: 07/27/2006 1516 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Benzene 102 94 69-129 9 20 <br /> MTBE 102 110 65-165 7 20 <br /> / Toluene 94 88 70-130 7 20 <br /> Surrogate MS %Rec MSD%Rec Acceptance Limits <br /> Toluene-d8 101 96 77- 121 <br /> 1,2-Dichloroethane-d4 125 131 X 73- 130 <br /> i <br /> i <br /> i <br /> � s <br /> I <br /> t <br /> s <br /> i <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> �' STL San Francesco Page 11 of 14 <br />