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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client: Shaw Environmental & Infrastructure, Inc. <br />Project Name : Foothill Landfill, San Joaquin County (New Wells) <br />Project Number: 124591 <br />Sample Matrix : WATER <br />Duplicate Summary <br />Inorganic Parameters <br />Sample Name: Batch QC <br />Lab Code: K0706823-004DUP <br />Test Notes <br />Analysis <br />Analyte Method <br />Solids, Total Dissolved (TDS) SM 2540 C <br />Service Request: <br />P0700704 <br />Date Collected : <br />NA <br />Date Received : <br />NA <br />Date Prepared: <br />NA <br />Date Analyzed: <br />08/06/07 <br />Units: mg/L <br />Basis: NA <br />Duplicate Relative <br />Sample Sample Percent Result <br />MRL Result Result Average Difference Notes <br />5 725 733 729 1 <br />SM Standard Methods for the Examination of Water and Wastewater, 20th Ed., 1998. <br />Report By: CSKII.LERN <br />9 <br />' P' <br />