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Quality Control Results <br /> Client: SECOR International, Inc. Job Number: 720-7408-1 <br /> Matrix Spike/ Method: 8260B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-17728 Preparation: 5030B <br /> MS Lab Sample ID: 720-7453-A-3 MS Analysis Batch: 720-17728 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200701\I <br /> Dilution: 1.0 Initial Weight/Volume: 5.14 g <br /> Date Analyzed: 01/29/2007 1423 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/29/2007 1423 <br /> MSD Lab Sample ID: 720-7453-A-3 MSD Analysis Batch: 720-17728 Instrument ID: Varian 3900A <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200701\01 <br /> Dilution: 1.0 Initial Weight/Volume: 5.15 g <br /> Date Analyzed: 01/29/2007 1445 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/29/2007 1445 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Benzene 94 107 69- 129 _ 13 20 <br /> MTBE 112 121 65- 165 8 20 <br /> Toluene 97 103 70- 130 6 20 <br /> Surrogate MS% Rec MSD% Rec Acceptance Limits <br /> Toluene-d8(Surr) 107 105 70- 130 <br /> 1,2-Dichloroethane-d4(Surr) 112 114 60- 140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 56 of 63 <br />