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Quality Control Results <br /> Client: Engeo, Inc. Job Number: 720-9969-1 <br /> Method Blank-Batch: 720-23858 Method: 300.0 <br /> Preparation: N/A <br /> Lab Sample ID: MB 720-23858/2 Analysis Batch: 720-23858 Instrument ID: Dionex IC <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: D:\2007\200707\DX-07180' <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 5 mL <br /> Date Analyzed: 07/18/2007 1647 Final Weight/Volume: 5 mL <br /> Date Prepared: N/A <br /> Analyte Result Qual RL <br /> Nitrate ion ND 1.0 <br /> Lab Control Spike/ Method: 300.0 <br /> Lab Control Spike Duplicate Recovery Report-Batch: 720-23858 Preparation: N/A <br /> LCS Lab Sample ID: LCS 720-23858/3 Analysis Batch: 720-23858 Instrument ID: Dionex IC <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: D:\2007\200707\DX-07180 <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 5 mL <br /> Date Analyzed: 07/18/2007 1703 Final Weight/Volume: 5 mL <br /> Date Prepared: N/A <br /> LCSD Lab Sample ID:LCSD 720-23858/4 Analysis Batch: 720-23858 Instrument ID: Dionex IC <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: D:\2007\200707\DX-0718071 <br /> Dilution: 1.0 Units: mg/L Initial Weight/Volume: 5 mL <br /> Date Analyzed: 07/18/2007 1718 Final Weight/Volume: 5 mL <br /> Date Prepared: N/A <br /> %Rec. <br /> Analyte LCS LCSD Limit RPD RPD Limit LCS Qual LCSD Qual <br /> Nitrate ion 100 105 80-120 5 20 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> STL San Francisco Page 9 of 18 07/24/2007 <br />