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Approved By Date <br />L--- —2Z <br />Report By:RWONG <br />COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client: <br />Shaw Environmental & Infrastructure, Inc. <br />Service Request: <br />P0700115 <br />Project Name: <br />Foothill Landfill, San Joaquin County <br />Date Collected : <br />01/31/07 <br />Project Number : <br />791289 (Ground Water) <br />Date Received : <br />02/02/07 <br />Sample Matrix: <br />WATER <br />Date Extracted : <br />NA <br />Date Analyzed : <br />02/02/07 <br />Matrix Spike/Duplicate Matrix Spike Summary <br />Sample Name: <br />LW -1 <br />Units: <br />mg/L (ppm) <br />Lab Code: <br />P0700115-004MS P0700115-004DMS <br />Basis: <br />NA <br />Test Notes <br />Spike <br />Prep Analysis Spike Level Sample <br />Spike Result Recovery <br />CAS <br />Acceptance <br />Relative <br />Percent Result <br />Analyte <br />Method Method PQL MS DMS Result <br />MS DMS MS DMS <br />Limits <br />Difference Notes <br />Sulfate <br />None 300.0 0.5 10.0 10.0 13.4 <br />23.6 23.5 102 101 <br />80-120 <br /><1 <br />Approved By Date <br />L--- —2Z <br />Report By:RWONG <br />