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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client ARCO Products Company Service Request. L9901978 <br /> Project WA#24406 0016020-Manteca Date Collected NA <br /> LCS Matrix- Soil Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: 5/1/99 <br /> Laboratory Control Sample Summary <br /> Oxygenates <br /> Sample Name Lab Control Sample Units ug/Kg(ppb) <br /> Lab Code L990501-LCS Basis wet <br /> Test Notes <br /> CAS <br /> Percent <br /> Recovery <br /> Prep Analysis True Percent Acceptance Result <br /> Analyte Method Method Value Result Recovery Limits Notes <br /> Benzene EPA 5030 8260E 500 553 111 70-130 <br /> Toluene EPA 5030 8260B 500 5 52 110 70-130 <br /> 1 Ethylbenzene EPA 5030 8260B 5 00 569 114 70-130 <br /> Approved By �^ Date <br /> LC§MNV3RHwi LCS V4M <br /> Prgc Nn <br />