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Quality Control Results <br /> Client: H2OGeoI Job Number: 720-8838-1 <br /> Lab Control Spike/ Method: 8082 <br /> Lab Control Spike Duplicate Recovery Report - Batch: 720-20862 Preparation: 3550B <br /> LCS Lab Sample ID:LCS 720-20862/2-AA Analysis Batch: 720-20946 Instrument ID: Agilent PCB 2 <br /> Client Matrix: Solid Prep Batch: 720-20862 Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/Kg Initial Weight/Volume: 30.21 g <br /> Date Analyzed: 04/27/2007 1522 Final WeighttVolume: 10 mL <br /> Date Prepared: 04/26/2007 1146 Injection Volume: <br /> Column ID: PRIMARY <br /> LCSD Lab Sample ID:LCSD 720-20862/3-AA Analysis Batch: 720-20946 Instrument ID: Agilent PCB 2 <br /> Client Matrix: Solid Prep Batch: 720-20862 Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/Kg Initial WeighWolume: 30.30 g <br /> Date Analyzed: 04/27/2007 1542 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1146 Injection Volume: <br /> Column ID: PRIMARY <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qua] <br /> PCB-1016 94 97 66-116 2 21 <br /> PCB-1260 88 93 57-110 5 24 <br /> Surrogate LCS % Rec LCSD % Rec Acceptance Limits <br /> Tetrachloro-m-xylene 93 96 54- 102 <br /> DCB Decachlorobiphenyl 90 95 34-95 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 57 of 84 <br />