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Quality Control Results <br /> Client: Geomatrix Consultants Inc. Job Number: 720-10502-1 <br /> Lab Control Spike/ Method: 6010B <br /> Lab Control Spike Duplicate Recovery Report- Batch: 720-25451 Preparation: 3010A <br /> LCS Lab Sample ID:LCS 720-25451/2-A Analysis Batch: 720-25532 Instrument ID: Varian ICP <br /> Client Matrix: Water Prep Batch: 720-25451 Lab File ID: N/A <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 08/30/2007 1426 Final Weight/Volume: 50 mL <br /> Date Prepared: 08/29/2007 1405 <br /> LCSD Lab Sample ID:LCSD 720-25451/3-A Analysis Batch: 720-25532 Instrument ID: Varian ICP <br /> Client Matrix: Water Prep Batch: 720-25451 Lab File ID: N/A <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 08/30/2007 1429 Final Weight/Volume: 50 mL <br /> Date Prepared: 08/29/2007 1405 <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Calcium 100 95 80- 120 5 20 <br /> Copper 102 98 80- 120 4 20 <br /> Iron 100 96 80- 120 4 20 <br /> Potassium 89 89 80- 120 1 20 <br /> Potassium 89 90 80- 120 4 20 <br /> Potassium 94 89 80- 120 1 20 <br /> Potassium 94 90 80- 120 4 20 <br /> Magnesium 96 93 80- 120 4 20 <br /> Manganese 100 97 80- 120 4 20 <br /> Sodium 97 94 80- 120 3 20 <br /> Zinc 99 94 80- 120 5 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 30 of 44 09/04/2007 <br />