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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19656-1 <br /> Lab Control Sample - Batch: 500-63461 Method: 6020 <br /> Preparation: 3005A <br /> Total Recoverable <br /> Lab Sample ID: LCS 500-63461/2-A Analysis Batch: 500-63525 Instrument ID: ThermoElectron ICP-MS <br /> Client Matrix: Water Prep Batch: 500-63461 Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 05/12/2009 0233 Final Weight/Volume: 50 mL <br /> Date Prepared: 05/11/2009 0830 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> Boron 1000 1160 116 80- 120 <br /> Beryllium 50.0 51.2 102 80- 120 ^ <br /> Lab Control Sample - Batch: 500-63461 Method: 6020 <br /> Preparation: 3005A <br /> Total Recoverable <br /> Lab Sample ID: LCS 500-63461/2-A Analysis Batch: 500-63734 Instrument ID: ThermoElectron ICP-MS <br /> Client Matrix: Water Prep Batch: 500-63461 Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 05/13/2009 1807 Final Weight/Volume: 50 mL <br /> Date Prepared: 05/11/2009 0830 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> Antimony 500 531 106 80- 120 <br /> Arsenic 100 108 108 80- 120 <br /> Barium 500 514 103 80- 120 <br /> Chromium 200 192 96 80- 120 <br /> Cobalt 500 474 95 80- 120 <br /> Iron 1000 1020 102 80- 120 <br /> Magnesium 10000 9840 98 80- 120 <br /> Manganese 500 486 97 80- 120 <br /> Potassium 10000 9740 97 80- 120 <br /> Selenium 100 109 109 80- 120 <br /> Molybdenum 1000 1010 101 80- 120 <br /> Sodium 10000 10000 100 80- 120 <br /> Vanadium 500 479 96 80- 120 <br /> Zinc 500 502 100 80- 120 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 59 of 74 <br />