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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />t <br />Client: <br />Shaw Environmental & Infrastructure, Inc. <br />Service Request: P0700115 <br />Project Name : <br />Foothill Landfill, San Joaquin County <br />Date Collected : 01/31/07 <br />Project Number: <br />791289 (Ground Water) <br />Date Received : 02/02/07 <br />Sample Matrix: <br />WATER <br />Date Extracted : NA <br />Date Analyzed : 02/02/07 <br />Matrix Spike/Duplicate Matrix Spike <br />Summary <br />t <br />Sample Name: <br />LW -1 <br />Units: mg/L (ppm) <br />Lab Code: <br />P0700115-004MS P0700115-004DMS <br />Basis : NA <br />Test Notes <br />Spike <br />Analysis Spike Level Sample <br />CAS RelativePreP <br />Spike Result Recovery Result <br />Analyte <br />Method Method PQL MS DMS Result <br />MS DMS MS DMS Acceptance Percent Notes <br />Limits Difference <br />Nitrate as Nitrogen <br />None 300.0 0.2 2.26 2.26 1.20 <br />3.34 3.36 95 96 80-120 <1 <br />1 <br />i <br />1 <br />Approved By _ <br />Date <br />i <br />Report By:RWONG <br />t <br />