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Quality Control Results <br /> Client: Environmental Cost Management, Inc. Job Number: 720-19656-1 <br /> Method Blank- Batch: 720-49965 Method: 7199 <br /> Preparation: N/A <br /> Lab Sample ID: MB 720-49965/5 Analysis Batch: 720-49965 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 05/06/2009 0910 Final Weight/Volume: 50 mL <br /> Date Prepared: N/A <br /> Analyte Result Qual RL <br /> Cr(VI) ND ^ 0.50 <br /> Lab Control Sample/ Method: 7199 <br /> Lab Control Sample Duplicate Recovery Report- Batch: 720-49965 Preparation: N/A <br /> LCS Lab Sample ID:LCS 720-49965/6 Analysis Batch: 720-49965 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 05/06/2009 0917 Final Weight/Volume: 50 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-49965/7 Analysis Batch: 720-49965 Instrument ID: No Equipment Assigned <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: ug/L Initial Weight/Volume: 50 mL <br /> Date Analyzed: 05/06/2009 0926 Final Weight/Volume: 50 mL <br /> Date Prepared: N/A <br /> % Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Cr(VI) 105 101 85- 115 4 20 ^ ^ <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 63 of 74 <br />