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i <br /> Quality Control Results <br /> I <br /> Client: H2OGeoI Job Number: 720-9207-1 <br /> Lab Control Spike/ Method: 82608 <br /> Lab Control Spike Duplicate Recovery Report-Batch: 720-21994 Preparation: 5030B j <br /> i <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 Lao File ID: c:\satumws\data\200705\0! <br /> Dilution: 1.0 Units: mg/Kg - Initial WeighWolume: 5 g � <br /> Date Analyzed: 05/23/2007 0922 Final WeighWolume: 10 mL <br /> Date Prepared: 05/23/2007'0922 <br /> i <br /> LCSD Lab Sample ID:LCSD 720-21994/1 Analysis Batch: 720-21994 Instrument ID: Varian 3900A i <br /> Client Matrix: Solid Prep Batch: N/A - Lab File ID: casaturnws\data\200705\05: <br /> Dilution: 1.0 Units: mg/Kg Initial WeighWolume: 5 g <br /> Date Analyzed: 05/23/2007 0944 Final WeighWolume: 10 mL <br /> Date Prepared: 05/23/2007 0944 <br /> I ; <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 66- 165 3 20 I <br /> Toluene 104 106 70- 130 2 20 <br /> Surrogate LCS%Rec LCSD% Reo Acceptance Limits <br /> Toluene-dB(Surr) 97 "96 70- 130 <br /> 1,2-Dichloroethane-d4(Surr) 77 .77 - 60- 140 <br /> i <br /> t <br /> i <br /> 1 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> I <br /> STL San Francisco Page 14 of 20 j <br /> 1 <br />