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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 : 01/04/06 <br /> Matrix Spike/Duplicate Matrix Spike Summary <br /> Sample Name : S-1 Units : mg/L(ppm) <br /> Lab Code : L0600004-OOIMS L0600004-OOIDMS Basis : NA <br /> Test Notes <br /> Spike <br /> Prep Analysis Spike Level Sample Spike Result Recovery CAS Relative <br /> Acceptance Percent Result <br /> Analyte Method Method <br /> PQL MS DMS Result MS DMS MS DMS1V s <br /> Limits Difference <br /> Nitrate as Nitrogen METHOD 300.0 2 22.6 22.6 5.58 27.3 27.4 96 97 85-111 <1 <br /> Approved By Date : O fJ <br /> Renort RwNKnnermnn <br />