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Quality Control Results <br /> Client: Geomatrix Consultants Inc. Job Number: 720-10502-1 <br /> Lab Control Spike - Batch: 720-25357 Method: 9040B <br /> Preparation: N/A <br /> Lab Sample ID: LCS 720-25357/1 Analysis Batch: 720-25357 Instrument ID: Corning pH <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: SU Initial Weight/Volume: 50 mL <br /> Date Analyzed: 08/24/2007 1155 Final Weight/Volume: mL <br /> Date Prepared: N/A <br /> Analyte Spike Amount Result % Rec. Limit Qual <br /> pH 7.00 7.000 100 99- 101 <br /> Duplicate - Batch: 720-25357 Method: 9040B <br /> Preparation: N/A <br /> Lab Sample ID: 720-10493-A-6 DU Analysis Batch: 720-25357 Instrument ID: Corning pH <br /> Client Matrix: Water Prep Batch: N/A Lab File ID: N/A <br /> Dilution: 1.0 Units: SU Initial Weight/Volume: 20 mL <br /> Date Analyzed: 08/24/2007 1216 Final Weight/Volume: mL <br /> Date Prepared: N/A <br /> Analyte Sample Result/Qual Result RPD Limit Qual <br /> pH 7.17 7.160 0 1 <br /> Calculations are performed before rounding to avoid round-off errors in calculated results. <br /> TestAmerica San Francisco Page 40 of 44 09/04/2007 <br />