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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: EMCON Service Request- L9504200 <br /> Project: ARCO Products Company#2168/#1775-234 001 bate Collected: NA <br /> LCS Matrix. Water Date Received NA <br /> Date Extracted: NA <br /> Date Analyzed: 1217195 <br /> Laboratory Control Sample/Duplicate Laboratory Control Sample Summary* <br /> Total Recoverable Petroleum H%drocarbons (TRPH) <br /> SM5520C/F <br /> Units mg/L(ppm) <br /> Percent Recovery <br /> CAS Relative <br /> True V.ilue Result Acceptance Percent <br /> Analyte LCS DLCS LCS DLCS LCS DLCS Linuts Difference <br /> TRPH 2X15 2 05 182 189 89 92 75-125 4 <br /> * Sample quantity was insufficient to perform matrix spike and matrix spike duplicate Three <br /> separate replicate one liter samples are required to analvze sample and spikes <br /> DLCSM32395 <br /> Page 9 <br />