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Quality Control Results <br /> Client: H2OGeoI Job Number: 720-8838-1 <br /> Matrix Spike/ Method: 8082 <br /> Matrix Spike Duplicate Recovery Report - Batch: 720-20862 Preparation: 35508 <br /> MS Lab Sample ID: 720-8838-2 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 Initial WeighWolume: 30.10 g <br /> Date Analyzed: 04/27/2007 1232 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1146 Injection Volume: <br /> Column ID: PRIMARY <br /> MSD Lab Sample ID: 720-8838-2 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 Initial Weight/Volume: 30.34 g <br /> Date Analyzed: 04/27/2007 1252 Final Weight/Volume: 10 mL <br /> Date Prepared: 04/26/2007 1146 Injection Volume: <br /> Column ID: PRIMARY <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> PCB-1016 86 81 25- 147 7 38 <br /> PCB-1260 75 72 14- 145 5 48 <br /> Surrogate MS % Rec MSD % Rec Acceptance Limits <br /> Tetrachloro-m-xylene 85 80 54- 102 <br /> DCB Decachlorobiphenyl 77 72 34 -95 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 58 of 84 <br />