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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client : <br />Shaw Environmental & Infrastructure, Inc. <br />Service Request : <br />P0700685 <br />Project Name: <br />Foothill Landfill, San Joaquin County <br />Date Collected : <br />07/24/07 <br />Project Number : <br />124591 (Ground Water) <br />Date Received : <br />07/25/07 <br />Sample Matrix : <br />WATER <br />Date Extracted: <br />NA <br />Date Analyzed : <br />07/25/07 <br />Matrix Spike/Duplicate Matrix Spike Summary <br />Sample Name: MW -2R Units: mb/L (ppm) <br />Lab Code: P0700685-002MS P0700685-002DMS Basis: NA <br />Test Notes : <br />Spike <br />Prep Analysis Spike Level Sample Spike Result Recovery CAS Relative Result <br />Analyte Method Method p L MS DMS Result MS DMS MS DMS Acceptance Percent Notes <br />Y Q Limits Difference <br />Sulfate None 300.0 0.5 10.0 10.0 1.72 10.8 10.8 91 91 80-120 <1 <br />Approved Byi Date <br />Report By:RWONG <br />