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Quality Control Results <br /> U� q pa <br /> �Clie :nt: San Joaquin Company y Inc Job Number: 720-2949-1 <br /> Matrix Spike/ Method: 8260B <br /> { Matrix Spike Duplicate Recovery Report- Batch: 720-7554 Preparation: 5030B <br /> Li <br /> { MS Lab Sample ID: 720-2949-11 Analysis Batch: 720-7554 Instrument ID: Varian 3900A I <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsatumwsldata120060411 r` <br /> Dilution: 1.0 Initial WeightlVolume: 10 mL <br /> Date Analyzed: 04/11/2006 0117 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/11/2006 0117 <br /> MSD Lab Sample ID: 720-2949-11 Analysis Batch: 720-7554 Instrument ID: Varian 3900A <br /> Client Matrix: Water Pre Batch: NIA <br /> P Lab Foie ID: c:Isatumwsldata120060410-, <br /> Dilution: 1.0 Initial WeightNolume: 10 mL <br /> Date Analyzed: 04/11/2006 0139 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/11/2006 0139 <br /> I % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Benzene 87 98 69- 129 11 20 <br /> MTBE 100 114 65- 165 9 20 <br /> ? Toluene 87 96 70- 130 10 20 <br /> Surrogate MS%Rec MSD %Rec Acceptance Limits <br /> Toluene-d8 98 � 94 77- 121 <br /> 1,2-Dichloroethane-d4 107 103 73- 130 <br /> L <br /> { <br />'k <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 50 of 54 <br /> _ t <br />