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Quality Control Results <br /> Client: H2OGeol Job Number: 720-9207-1 <br /> Lab Control Spike/ Method: 82608 <br /> Lab Control Spike Duplicate Recovery Report- Batch: 720-21994 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-21994/2 Analysis Batch: 720-21994 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\satumwstdata\200705\0! <br /> Dilution: 1.0 Units: mg/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 05/23/2007 0922 Final WeighUVolume: 10 mL <br /> Date Prepared: 05/23/2007 0922 <br /> LCSD Lab Sample ID:LCSD 720-21994/1 Analysis Batch: 720-21994 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:tsatumws\data\200705\05: <br /> Dilution: 1.0 Units: mg/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 05/23/2007 0944 Final Weight/Volume: 10 mL <br /> Date Prepared: 0523/2007 0944 <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 95 95 69-129 0 20 <br /> MTBE 94 97 65-165 3 20 <br /> Toluene 104 106 70-130 2 20 <br /> Surrogate LCS % Rec LCSD %Rec Acceptance Limits <br /> Toluene-d8(Surr) 97 96 70-130 <br /> 1,2-Dichloroethane-d4(Surr) 77 77 60- 140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 14 of 20 <br />