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1 <br />COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client : Shaw Enviromnental & Infrastructure, Inc. <br />Project Name: Foothill Landfall, 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: P0700695-OOIDUP <br />Test Notes <br />Analysis <br />Analyte Method <br />Total Sulfide SM 4500-52- D <br />1 <br />1 <br />1 <br />1 <br />Service Request : <br />P0700704 <br />Date Collected : <br />NA <br />Date Received: <br />NA <br />Date Prepared: <br />NA <br />Date Analyzed: <br />08/02/07 <br />Units : <br />mg/L <br />Basis : <br />NA <br />Duplicate <br />Relative <br />Sample Sample <br />Percent Result <br />MRL Result Result <br />Average Difference Notes <br />0.05 ND ND <br />ND - <br />SM Standard Methods for the Examination of Water and. Wastewater, 20th Ed., 1998, <br />Report By: CSKILLERN <br />55 <br />00025 <br />