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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client : Shaw Environmental & Infrastructure, Inc. Service Request : P0700704 <br />Project Name: Foothill Landfill, San Joaquin County (New Wells) Date Collected : NA <br />Project Number : 124591 Date Received : NA <br />Sample Matrix: WATER Date Extracted : NA <br />Date Analyzed : 08/01/07 <br />Laboratory Control Sample Summary <br />Inorganic Parameters <br />Sample Name: Laboratory Control Sample Basis: NA <br />Lab Code: P0700704-LCS <br />Test Notes <br />CAS <br />Percent <br />Recovery <br />Analysis Percent Acceptance Result <br />Analyte Units Method True Value Result Recovery Limits Notes <br />Chloride mg/L (ppm) 300.0 5.00 4.65 93 90-110 <br />Nitrate as Nitrogen mg/L (ppm) 300.0 1.13 1.07 95 90-110 <br />Sulfate mg/L (ppm) 300.0 5.00 4.70 94 90-110 <br />0 Approved By: r 2 5Date <br />Report ByD(astillo <br />