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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> St:ephani 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 11:33 <br /> Lab Number 92673 Sample Type LIQUID <br /> Pro'ect Number <br /> Protect Desc. Olivarez <br /> Sample Description MW-3 <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> methyl-t-Butyl Ether ND Ag/L 5.0 4 20 <br /> Di-isopropyl Ether ND µg/L 5.0 4 20 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 4 20 <br /> t-Amyl Methyl Ether ND 5.0 4 20 <br /> tert-Butyl Alcohol ND Ig/L 50 4 200 <br /> ND None DetectedPQ L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter = ppm Dil Dilution Factor 1 ppm = 1000 ppb <br />µg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 Qpm <br /> m Milligrams/Kilogram — ppm derived by (PQL x Dil) <br /> 1AMicrograms/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 • Fax 209-485-6935 <br />