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Quality Control Results <br /> Client: Secor International, Inc. Job Number: 720-1746-1 <br /> Laboratory Control/ Method: 8260B <br /> Laboratory Control Duplicate Recovery Report-Batch: 720-5394 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-5394/4 Analysis Batch: 720-5394 Instrument ID: Saturn 2100 <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200602\0: <br /> Dilution: 1.0 Units: mg/Kg Initial WeighUVolume: 5 g <br /> Date Analyzed: 02/08/2006 2036 Final Weight/Volume: 10 mL <br /> Date Prepared: 02/08/2006 2036 <br /> LCSD Lab Sample ID:LCSD 720-5394/3 Analysis Batch: 720-5394 Instrument to Saturn 2100 <br /> Client Matrix: Solid Prep Batch: N/A Lab File ID: c:\saturnws\data\200602\02( <br /> Dilution: 1.0 Units:mg/Kg Initial Weight/Volume: 5 g <br /> Date Analyzed: 02/08/2006 2340 Final Weight/Volume: 10 mL <br /> Date Prepared: 02/08/2006 2340 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 116 90 69- 129 25 20 <br /> MTBE 97 98 65- 165 1 20 <br /> Toluene 112 94 70- 130 17 20 <br /> Surrogate LCS%Rec LCSD%Rec Acceptance Limits <br /> Toluene-d8 97 91 70- 130 <br /> 1,2-Dichloroethane-d4 92 86 60-140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 16 of 24 <br />