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Quality Control Results <br /> Client: H2OGeoI Job Number: 720-8838-1 <br /> Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report - Batch: 720-20869 Preparation: 50308 <br /> MS Lab Sample ID: 720-8838-2 Analysis Batch: 720-20869 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200704\I <br /> Dilution: 1.0 Initial Weight/Volume: 5.27 g <br /> Date Analyzed: 04/26/2007 1139 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1139 <br /> MSD Lab Sample ID: 720-8838-2 Analysis Batch: 720-20869 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\2007040 <br /> Dilution: 1.0 Initial Weight/Volume: 5.11 g <br /> Date Analyzed: 04/26/2007 1201 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1201 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Benzene 88 91 69- 129 7 20 <br /> MTBE 86 96 65- 165 14 20 <br /> Toluene 97 103 70- 130 10 20 <br /> Surrogate MS % Rec MSD % Rec Acceptance Limits <br /> Toluene-d8(Surr) 95 99 70- 130 <br /> 1,2-Dichloroethane-d4(Sun) 79 79 60- 140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 49 of 84 <br />