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COLUMBIA ANALYTICAL SERVICES,INC. <br /> QA/QC Report <br /> Client: <br /> ARCO Products Company Service Request. L9901978 Project: WA#24406 0016020-Manteca Date Collected: NA <br /> LCS Matrix: Sol] Date Received: NA <br /> Date Extracted: NA <br /> Date Analyzed: 512199 <br /> Laboratory Control Sample Summary <br /> Oxygenates <br /> Sample Name Lab Control Sample Units ug/Kg(ppb) <br /> Lab Code L990502-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 8260B 500 515 103 70-130 <br /> Toluene EPA 5030 8260B 500 6 16 123 70-130 <br /> Ethylbenzene EPA 5030 8260B 500 477 95 70-130 <br /> d <br /> Approved By Date <br /> 191 Page No <br /> LC WR HW l LCS(2) 5!099 <br />