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COLUMBIA ANALYTICAL SERVICES,INC. <br /> . QA/QC Report <br /> Client: EMCON Service Request: K9505155S <br /> Protect: ARCO#2168/EMCON Project No 1775-234 001 Date Collected: NA <br /> LCS Matrix: Water Date Received: NA <br /> Date Extracted: 8124195 <br /> Date Analyzed: 8130195 <br /> Laboratory Control Sample Summary <br /> Oil and Grease <br /> SM 5520 C&F <br /> Units mg(L(ppm) <br /> CAS <br /> Percent <br /> Recovery <br /> True Percent Acceptance <br /> Analyte Value Result Recovery Limits <br /> Oil and Grease 20 21 105 82-108 <br /> LCS1102194 <br /> Page 16 <br />