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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: EMCON Service Request: L9504080 <br /> Project: ARCO Products Company#760/#1775-212 001 Date Collected: NA <br /> LCS Matrix: Water Date Received: NA <br /> Date Extracted: 11/27/95 <br /> Date Analyzed: 11/27/95 <br /> Laboratory Control Sample/Duplicate Laboratory Control Sample Summmary <br /> Total Petroleum Hydrocarbons(TPH) <br /> SM5520 B/F <br /> Units mg/L(ppm) <br /> Percent Recovery <br /> CAS Relative <br /> True Vdlue Result Acceptance Percent <br /> Analyte LCS DLCS LCS DLCS LCS DLCS Limits Difference <br /> TPH 649 649 627 61 7 97 95 75-125 2 <br /> Approved By Date <br /> DLC=32395 <br /> Page 13 <br />