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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> Client : Shaw Environmental&Infrastructure,Inc. Service Request : L0600154 <br /> Project Name: North County Landfill,San Joaquin County Date Collected : 01/26/06 <br /> Project Number: 791288(Ground Water) Date Received : 01/27/06 <br /> Sample Matrix: WATER Date Extracted : NA <br /> Date Analyzed : 01/27/06 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Sample Name: G-313 Units : mg/L(ppm) <br /> Lab Code: L0600154-002MS L0600154-002DMS Basis : NA <br /> Test Notes <br /> Spike <br /> Prep Analysis Spike Level Sample Spike Result Recovery CAS Relative <br /> Analyte Method Method Acceptance Percent Result <br /> PQL MS DMS Result MS DMS MS DMS Limits Difference No <br /> Sulfate METHOD 300.0 2 10.0 10.0 3.44 12.9 13.1 95 97 86-113 2 <br /> s <br /> Approved By Date <br /> i <br /> RPn—t AwWkIi nn — <br />