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Quality Control Results <br /> -"' Client: Secor International, Inc. Job Number: 720-791-1 <br /> Laboratory Control/ Method: 8260B <br /> Laboratory Control Duplicate Recovery Report- Batch: 720-3151 Preparation: 5030B <br /> LCS Lab Sample ID: LCS 720-3151113 Analysis Batch: 720-3151 Instrument ID: Varian 3900C <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsaturnwsldata120051211: <br /> Dilution: 1.0 Units: ug/L Initial WeightNolume: 10 mL <br /> Date Analyzed: 12/13/2005 2103 Final Weight/Volume: 10 mL <br /> Date Prepared: 12/13/2005 2103 <br /> LCSD Lab Sample ID:LCSD 720-3151112 Analysis Batch: 720-3151 Instrument ID: Varian 3900C <br /> Client Matrix: Water Prep Batch: NIA Lab File ID: c:lsaturnwsldata12005121121 <br /> Dilution: 1.0 Units:ug1L Initial Weight/Volume: 10 mL <br /> Date Analyzed: 12/13/2005 2131 Final WeightlVolume: 10 mL <br /> Date Prepared: 12/13/2005 2131 <br /> '7 <br /> -i <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qua] LCSD Qual <br /> Benzene 106 107 69- 129 1 25 <br /> MTBE 99 99 65-165 0 25 <br /> "»- Toluene 99 99 70-130 0 25 <br /> Surrogate LCS% Rec LCSD% Rec Acceptance Limits <br /> Toluene-d8 108 111 77- 121 <br /> 1,2-Dichloroethane-d4 111 108 73- 130 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> i <br /> STL San Francisco Page 9 of 11 <br /> 1 <br />