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COLUMBIA ANALYTICAL SERVICES, INC. <br /> QA/QC Report <br /> OChent. ARCO Products Company Service Request: L9602626 <br /> Project -60 LODI/#21775-212 002/TO#19350 00 Date Collected: NA <br /> LCS Matrix: Nater Date Received: NA <br /> Date Extracted: 5129196 <br /> Date Analyzed: 5131196 <br /> Laboratory Control Sample/Duplicate Laboratory Control Sample Summary* <br /> Total Petroleum Hydrocarbons as Diesel <br /> EPA Methods 3510/Modified 8015/California DHS LUFT Method <br /> Units ug/L.(ppb) <br /> Percent Recovery <br /> CAS Relative <br /> True Value Result Acceptance Percent <br /> Analyte LCS DLCS LCS DLCS LCS DLCS Limits Difference <br /> Diesel 2000 2000 1620 1690 81 84 70-140 4 <br /> * Sample quantity NN as insufficient to perform matrix spike and matrix spike duplicate Three <br /> separate replicate one liter samples are required to analyze sample and spices <br /> DLCS1032395 <br /> Page 12 <br />