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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client : Shaw Environmental&Infrastructure,Inc. Service Request: L0600004 <br /> Project Name : N.County LF,San Joaquin County 1st Storm Event Date Collected : 01/03/06 <br /> Project Number: 791288/00005000 Date Received: 01/04/06 <br /> Sample Matrix : WATER Date Extracted • NA <br /> Date Analyzed : 01/05/06 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Sample Name: S-1 Units : mg/L(ppm) <br /> Lab Code : L0600004-OOlMS L0600004-OOIDMS Basis : NA <br /> Test Notes <br /> Spike <br /> Prep Analysis Spike Level Sample Spike Result Recovery CAS Relative Result <br /> Acceptance Percent <br /> Analyte Method Method PQL MS DMS Result MS DMS MS DMS Limits Difference Notes <br /> Sulfate METHOD 300.0 10 50.0 50.0 14.5 59.2 59.8 89 91 86-113 <1 <br /> Approved By Date : Q� <br />