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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: Shaw Environmental&Infrastructure,Inc. Service Request: P0800191 <br /> � Project Name : Foothill Landfill,San Joaquin County Date Collected : NA <br /> + Project Number: 124591 (Ground Water) Date Received : NA <br /> Sample Matrix : WATER Date Extracted : NA <br /> Date Analyzed : 02/06/08 <br /> Laboratory Control Sample Summary <br /> Inorganic Parameters <br /> Sample Name: Laboratory Control Sample Basis: NA <br /> Lab Code : P0800191-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 4.60 92 94-105 N4 <br /> Nitrate as Nitrogen mg/L(ppm) 300.0 1.13 1.09 96 92-107 <br /> Sulfate mg/L(ppm) 300.0 5.00 4.85 97 90-110 <br /> N4 The LCS was outside of laboratory control limits but within method specified control limits;therefore, <br /> data was approved per CAS-CP standard operating procedure. <br /> Approved By: (I n� ; �, �r Date: /'" �, t 27 <br /> Report By:DCastillo <br />