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COLUMBIA ANALYTICAL SERVICES,INC <br /> Analytical Report <br /> Client- ARCO Products Company Service Request: L9901977 <br /> Project WA#24406 00/6020-Manteca Date Collected. 4/29/99 <br /> Sample Matrix: Sol] Date Received: 4/30/99 <br /> Oxygenates <br /> Sample Name T-3-M(16') Units ug/Kg(ppb)' <br /> Lab Code L9901977-004 Basis Wet <br /> Test Notes C2A <br /> Prep Analysis sis Dilution Date Date Result <br /> Analyte Method Method MRL Factor Extracted Analyzed Result Notes <br /> tent-Butyl Alcohol EPA 5030 8260B ,100 2 NA 5/3/99 3100 <br /> Diisopropyl Ether EPA 5030 8260B 5 2 NA 5/3/99 <10 <br /> Ethyl tent-Butyl Ether EPA 5030 8260B 5 2 NA 5/3/99 <10 <br /> tert-Amyl Methyl Ether EPA 5030 - 8260B 5 2 NA 5/3/99 <10 <br /> Methyl ten-Butyl Ether EPA 5030 8260B 5 2 NA 5/3/99 1900 <br /> C2A MRL is elevated because of matrix interferences and because the sample required dilutmg <br /> Approved By —� Date s✓�� ��� <br /> IS22=0597P <br /> 01977VOA HW I Sam*(4)514" Page No <br />