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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19656-1 <br /> Method Blank- Batch: 720-50045 Method: SM 2540C <br /> Preparation: N/A <br /> Lab Sample ID: MB 720-50045/1 Analysis Batch: 720-50045 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL <br /> Date Analyzed: 05/12/2009 1044 Final Weight/Volume: 100 mL <br /> Date Prepared: N/A <br /> Analyte Result Qual RL <br /> Total Dissolved Solids ND 50 <br /> Lab Control Sample/ Method: SM 2540C <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-50045 Preparation: N/A <br /> LCS Lab Sample ID:LCS 720-50045/2 Analysis Batch: 720-50045 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL <br /> Date Analyzed: 05/12/2009 1044 Final Weight/Volume: 100 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-50045/3 Analysis Batch: 720-50045 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 100 mL <br /> Date Analyzed: 05/12/2009 1044 Final Weight/Volume: 100 mL <br /> Date Prepared: N/A <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Total Dissolved Solids 96 97 80- 120 1 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 67 of 74 <br />