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� r <br /> COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: ARCO Products Company Service Request: L9701753 <br /> Project: #2158 Stock-ton/#21775-234 002/TO#21333 00 Date Collected: NA <br /> LCS Matrix: Water Date Received: NA <br /> Date Extracted: 5/22/97 <br /> Date Analyzed: 5/22197 <br /> Laboratory Control Sample/Duplicate Laboratory Control Sample Summary* <br /> Hydrocarbons <br /> SM 5520C/F <br /> Units mg/L(ppm) <br /> Percent Recovery <br /> CAS Relative <br /> True Value Result Acceptance Percent <br /> Analyte LCS DLCS LCS DLCS LCS DLCS Lumts Difference <br /> Hydrocarbons 1 88 188 2 25 189 120 101 75-125 17 <br /> * Sample quantity was insufficient to perform matrix spike and matrix spike duplicate Three <br /> separate,replicate one liter samples are required to analyze sample and spikes <br /> DLCSl032395 <br /> Page 14 <br />