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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: 720-17673 Preparation: 5030B <br /> MS Lab Sample ID: 720-7408-1 Analysis Batch: 720-17673 Instrument ID: Saturn 2100 <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200701\( <br /> Dilution: 1.0 Initial Weight/Volume: 5.05 g <br /> Date Analyzed: 01/25/2007 2157 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/25/2007 2157 <br /> MSD Lab Sample ID: 720-7408-1 Analysis Batch: 720-17673 Instrument ID. Saturn 2100 <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200701\0' <br /> Dilution: 1.0 Initial Weight/Volume: 5.00 g <br /> Date Analyzed: 01/25/2007 2223 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/25/2007 2223 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qua[ <br /> Benzene 109 115 69- 129 6 20 <br /> MTBE 81 79 65- 165 2 20 <br /> Toluene 106 104 70-130 1 20 <br /> Surrogate MS% Rec MSD% Rec Acceptance Limits <br /> Toluene-d8(Surr) 88 91 70-130 <br /> 1,2-Dichloroethane-d4(Surr) 63 59 X 60-140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 53 of 63 <br />