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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: 500-63840 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: 05/14/2009 1529 Final Weight/Volume: 50 mL <br /> Date Prepared: 05/11/2009 0830 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> Cadmium 50.0 56.8 114 80- 120 <br /> Copper 250 268 107 80- 120 <br /> Nickel 500 535 107 80- 120 <br /> Silver 50.0 54.1 108 80- 120 <br /> Thallium 100 118 118 80- 120 ^ <br /> Tin 1000 1110 111 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: 500-63938 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: 05/15/2009 1404 Final Weight/Volume: 50 mL <br /> Date Prepared: 05/11/2009 0830 <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> Lead 100 112 112 80- 120 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 60 of 74 <br />