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Quality Control Results <br /> Client: H2OGeoI Job Number: 720-8838-1 <br /> Lab Control Spike/ Method: 8260B <br /> Lab Control Spike Duplicate Recovery Report - Batch: 720-20869 Preparation: 5030B <br /> LCS Lab Sample ID:LCS 720-20869/2 Analysis Batch: 720-20869 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200704\0, <br /> Dilution: 1.0 Units: mg/Kg Initial Weight/Volume: 5.0 g <br /> Date Analyzed: 04/26/2007 0926 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 0926 <br /> LCSD Lab Sample ID:LCSD 720-20869/1 Analysis Batch: 720-20869 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200704\04: <br /> Dilution: 1.0 Units: mg/Kg Initial Weight/Volume: 5.0 g <br /> Date Analyzed: 04/26/2007 0948 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 0948 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 98 98 69- 129 0 20 <br /> MTBE 114 111 65- 165 3 20 <br /> Toluene 112 109 70- 130 3 20 <br /> Surrogate LCS% Rec LCSD% Rec Acceptance Limits <br /> Toluene-d8(Surr) 98 98 70 - 130 <br /> 1,2-Dichloroethane-d4(Surr) 81 80 60- 140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 48 of 84 <br />