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Quality Control Results <br /> Client: Geomatrix Consultants Inc. Job Number: 720-9514-1 <br /> Matrix Spike/ Method: 6010B <br /> Matrix Spike Duplicate Recovery Report- Batch: 720-22773 Preparation: 3050B <br /> MS Lab Sample ID: 720-9514-1 Analysis Batch: 720-22822 Instrument ID: Varian ICP <br /> Client Matrix: Solid Prep Batch: 720-22773 Lab File ID: N/A <br /> Dilution: 1.0 Initial Weight/Volume: 1.01 g <br /> Date Analyzed: 06/19/2007 1232 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/18/2007 1140 <br /> MSD Lab Sample ID: 720-9514-1 Analysis Batch: 720-22822 Instrument ID: Varian ICP <br /> Client Matrix: Solid Prep Batch: 720-22773 Lab File ID: N/A <br /> Dilution: 1.0 Initial Weight/Volume: 1.02 g <br /> Date Analyzed: 06/19/2007 1235 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/18/2007 1140 <br /> % Rec. <br /> Analyte MS MSD Limit RPD RPD Limit MS Qual MSD Qual <br /> Antimony 11 10 75- 125 8 20 F F <br /> Arsenic 86 85 75- 125 1 20 <br /> Barium 70 74 75- 125 1 20 F F <br /> Beryllium 89 89 75- 125 1 20 <br /> Cadmium 82 81 75- 125 1 20 <br /> Chromium 83 83 75- 125 1 20 <br /> Cobalt 83 82 75- 125 2 20 <br /> Copper 90 91 75- 125 1 20 <br /> Lead 81 81 75- 125 1 20 <br /> Molybdenum 77 76 75- 125 2 20 <br /> Nickel 82 82 75- 125 1 20 <br /> Selenium 85 84 75- 125 2 20 <br /> Silver 88 88 75- 125 2 20 <br /> Thallium 79 78 75- 125 2 20 <br /> Vanadium 85 85 75- 125 0 20 <br /> Zinc 79 80 75- 125 0 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 210 of 222 06/25/2007 <br />