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COLUMBIA ANALYTICAL SERVICES, INC <br /> Analytical Report <br /> �Client EMCON Service Request S9901 l90 <br /> Project Apache Plastics,Stockton/22640-100 001 Date Collected 4/9/99 <br /> Sample Matrix Water Date Received 4/13/99 <br /> Fuel Oxygenates <br /> Sample Name MW-9 Units ug/L(ppb) <br /> Lab Code S9901190-002 Basis NA <br /> Test Notes M1 <br /> Prep Analysis Dilution Date Date Result <br /> Analyte Method Method MRL factor Extracted Analyzed Result Notes <br /> Cert-Butyl Alcohol NONE 8260 50 200 NA 4/23/99 <10000 <br /> Methyl Cert-Butyl Ether NONE 8260 05 200 NA 4/23/99 <100 <br /> Diisopropyl Ether NONE 8260 5 200 NA 4/23/99 <1000 <br /> Ethyl tern-Butyl Ether NONE 8260 5 200 NA 4/23/99 <1000 <br /> Cert-Amyl Methyl Ether NONE 8260 5 200 NA 4/23/99 <1000 <br /> I <br /> Mi. The MRL was elevated because of matrix interferences <br /> The sample contained high concentrations of non-target analytes <br /> P.—A <br />