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Quality Control Results <br /> Client: SECOR International, Inc. Job Number: 720-7408-1 <br /> Lab Control Spike/ Method: 8260B <br /> Lab Control Spike Duplicate Recovery Report- Batch: 720-17645 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-17645/2-AA Analysis Batch: 720-17644 Instrument ID: Varian 3900E <br /> Client Matrix: Solid Prep Batch: 720-17645 Lab File ID: c:\varianws\data\200701\0' <br /> Dilution: 200 Units: mg/Kg Initial Weight/Volume: 5.0 g <br /> Date Analyzed: 01/26/2007 1254 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/26/2007 1553 <br /> LCSD Lab Sample ID:LCSD 720-17645/3-AA Analysis Batch: 720-17644 Instrument ID: Varian 3900E <br /> Client Matrix: Solid Prep Batch: 720-17645 Lab File ID: c:\varianws\data\200701\012 <br /> Dilution: 200 Units: mg/Kg Initial Weight/Volume: 5.0 g <br /> Date Analyzed: 01/26/2007 1316 Final Weight/Volume: 10 mL <br /> Date Prepared: 01/26/2007 1553 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Benzene 105 116 69- 129 10 20 <br /> MTBE 96 108 65- 165 12 20 <br /> Toluene 106 119 70- 130 12 20 <br /> Surrogate LCS% Rec LCSD% Rec Acceptance Limits <br /> Toluene-d8(Surr) 107 118 50- 130 <br /> 1,2-Dichloroethane-d4(Surr) 116 130 60- 140 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 47 of 63 <br />