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LABORATORIES <br /> Certificate of Analysis <br /> tJohn Pfeiffer <br /> BSK & Associates, Sacramento Preparation Date 01/13/99 <br /> 3140 Gold Camp Drive Suite 160 Analysis Date 01/13/99 <br /> Rancho Cordova, CA 95670 Report Issue Date 02/09/99 <br /> Sample Date 01/08/99 <br /> Submission Number 9901000188 Sample Time 1322 <br /> Lab Number 93696 Sample Type LIQUID <br /> Project Number 07-40-0178 <br /> Project Desc Escalon <br /> Sample Description W-68-MW-4 <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dd DLR <br /> Lethyl-t-Butyl Ether ND Kg/L 50 1 5 <br /> Di-isopropyl Ether ND k/L 50 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 50 1 5 <br /> �t-Amyl Methyl Ether ND /A L 50 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 <br /> 1 <br /> ND None Detected PQL Practical Quantitation Limit Conversions <br /> %Zg <br /> Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> Micrograms/Liter = ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1 <br /> ' 1414 Stanislaus Street , Fresno, CA 93706-1623 , Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />