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COLUMBIA ANALYTICAL SERVICES, INC. <br />QA/QC Report <br />Client: Shaw Environmental & Infrastructure, Inc. Service Request: P0700704 <br />Project Name : Foothill Landfall, San Joaquin County (New Wells) Date Collected: 07/31/07 <br />Project Number : 124591 Date Received : 08/01/07 <br />Sample Matrix : WATER Date Extracted: NA <br />Date Analyzed: 08/01/07 <br />Matrix Spike/Duplicate Matrix Spike Summary <br />Sample Name: <br />MW -4 <br />Units: <br />mg/L (ppm) <br />Lab Code: <br />P0700704-OOIMS <br />P0700704-OOlDMS <br />Basis: <br />NA <br />Test Notes <br />Spike <br />Prep Analysis <br />Spike Level Sample Spike Result <br />Recovery <br />CAS Relative <br />Acceptance Percent Result <br />Analyte <br />Method Method <br />PQL MS DMS Result MS DMS <br />MS DMS <br />Limits Difference Notes <br />Chloride <br />None 300.0 <br />0.5 10.0 10.0 6.80 16.7 16.9 <br />99 101 <br />80-120 1 <br />1,., <br />Approved By_9V Date : 9>16-1 t/ <br />Report By:DCastillo <br />