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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Stephani Rossow <br /> Sherwood Labs, Inc. Preparation Date 01/07/99 <br /> P.O. Box 937/ 8071 N. Lander Ave. Analysis Date 01/07/99 <br /> Hilmar, CA 95324- Report Issue Date 01/11/99 <br /> Sample Date 12/29/98 <br /> Submission Number . 9901000008 Sample Time 11:42 <br /> Lab Number . 9204 Sample Type LIQUID <br /> pro,ect Number <br /> Prolect Desc. Olivarez <br /> Sample Description MW-1 <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether 330 µg/L 5.0 4 20 <br /> Di-isopropyl Ether ND WL 5.0 4 20 <br /> Ethyl t-Butyl Ether ND jug/L 5.0 4 20 <br /> t-Amyl Methyl Ether ND pg/L 5.0 4 20 <br /> tert-Butyl Alcohol 480 µg/L 50 4 200 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> Y /L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb - 0.001 ppm <br /> 4Vg Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> g Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 • Phone 209-497-2888, In CA 800-877-8310 0 Fax 209-485-6935 <br />