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Quality Control Results <br /> Client: Geomatrix Consultants Inc. Job Number: 720-9514-1 <br /> Lab Control Spike/ Method: 6010B <br /> Lab Control Spike Duplicate Recovery Report- Batch: 720-22773 Preparation: 3050B <br /> LCS Lab Sample ID:LCS 720-22773/2-AA 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 Units: mg/Kg Initial Weight/Volume: 1 g <br /> Date Analyzed: 06/19/2007 1155 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/18/2007 1140 <br /> LCSD Lab Sample ID:LCSD 720-22773/3-AA 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 Units: mg/Kg Initial Weight/Volume: 1 g <br /> Date Analyzed: 06/19/2007 1158 Final Weight/Volume: 50 mL <br /> Date Prepared: 06/18/2007 1140 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Antimony 95 98 80- 120 3 20 <br /> Arsenic 100 101 80- 120 1 20 <br /> Barium 100 101 80- 120 1 20 <br /> Beryllium 99 101 80- 120 1 20 <br /> Cadmium 98 99 80- 120 1 20 <br /> Chromium 97 98 80- 120 1 20 <br /> Cobalt 99 100 80- 120 1 20 <br /> Copper 102 102 80- 120 1 20 <br /> Lead 98 99 80- 120 1 20 <br /> Molybdenum 104 105 80- 120 2 20 <br /> Nickel 98 99 80- 120 1 20 <br /> Selenium 99 100 80- 120 2 20 <br /> Silver 99 100 80- 120 1 20 <br /> Thallium 99 100 80- 120 1 20 <br /> Vanadium 102 103 80- 120 1 20 <br /> Zinc 97 98 80- 120 1 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 209 of 222 06/25/2007 <br />