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Quality Control Results <br /> Client: Geomatrix Consultants Inc. Job Number: 720-9415-1 <br /> Matrix Spike/ Method: 6010B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-22443 Preparation: 3050B <br /> MS Lab Sample ID: 720-9386-A-1-B MS Analysis Batch: 720-22497 Instrument ID: Varian ICP <br /> Client Matrix: Solid Prep Batch: 720-22443 Lab File ID: N/A <br /> Dilution: 1.0 Initial Weight/Volume: 1.01 g <br /> Date Analyzed: 06/08/2007 1157 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/07/2007 1333 <br /> MSD Lab Sample ID: 720-9386-A-1-C MSD Analysis Batch: 720-22497 Instrument ID: Varian ICP <br /> Client Matrix: Solid Prep Batch: 720-22443 Lab File ID: N/A <br /> Dilution: 1.0 Initial Weight/Volume: 1.03 g <br /> Date Analyzed: 06/08/2007 1201 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/07/2007 1333 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Antimony 28 26 75- 125 7 20 F F <br /> Arsenic 87 87 75- 125 1 20 <br /> Barium 85 89 75- 125 1 20 <br /> Beryllium 90 91 75- 125 1 20 <br /> Cadmium 84 85 75- 125 2 20 <br /> Chromium 86 87 75- 125 0 20 <br /> Cobalt 85 86 75- 125 1 20 <br /> Copper 96 93 75- 125 4 20 <br /> Lead 85 85 75- 125 2 20 <br /> Molybdenum 88 88 75- 125 2 20 <br /> Nickel 83 87 75- 125 1 20 <br /> Selenium 87 88 75- 125 2 20 <br /> Silver 92 93 75- 125 1 20 <br /> Thallium 80 80 75- 125 2 20 <br /> Vanadium 89 86 75- 125 3 20 <br /> Zinc 82 82 75- 125 2 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 59 of 64 06/14/2007 <br />