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L <br /> Quality Control Results <br /> ,tient: San Joaquin Company Inc Job Number: 720-4654-1 <br /> I ; <br /> L' LaboratoryMethod: 8260B <br /> Control) <br /> Laboratory Control Duplicate Recovery Report -Batch: 720-11403 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-1140315 Analysis Batch: 720-11403 Instrument 1D: Varian 3900E <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:Ivarianwsldata120060710+ <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 07/27/2006 1144 Final Weight/Volume: 10 mL <br /> l Date Prepared: 07/27/2006 1144 <br /> .._ .......... ............. - -................ . ............ ........._.... _ -- .......... <br /> LCSD Lab Sample ID:LCSD 720-11403/4 Analysis Batch: 720-11403 Instrument ID: Varian 3900E <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lvarianwsldata12006071072 <br /> Dilution: 1.0 Units:ug/L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 07/27/2006 1205 Final Weight/Volume: 10 mL <br /> Date Prepared: 07/27/2006 1205 <br /> j % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> i <br /> Benzene 105 95 69- 129 10 25 <br /> MTBE 94 99 65- 165 5 25 <br /> LToluene 98 90 70- 130 8 25 <br /> Surrogate LCS% Rec LCSD% Rec Acceptance Limits <br /> Toluene-d8 101 96 77- 121 <br /> 1,2-Dichloroethane-d4 108 115 73-130 <br /> 1 <br /> f <br /> t <br /> 4 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STI-San Francisco <br /> ` Page 10 of 14 <br />