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A N A L Y T IIPU A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> 'John 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 1226 <br /> Lab Number 93695 Sample Type LIQUID <br /> �Pro�ect Number 07-40-0178 <br /> Protect Desc Escalon <br /> Sample Description W-68-MW-3 <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dd DLR <br /> ethyl-t-Bu 1 Ether ND pg/L 50 1 5 <br /> Di-isopropyl Ether ND pg/L 50 1 5 <br /> Ethyl t-Butyl Ether ND pg/L 50 1 5 <br /> Ot-Amyl Methyl Ether ND pg/L 50 1 5 <br /> Etert-Butyl Alcohol ND pg/L 50 1 50 <br /> ND None DetectedPQL Practical Quantitation Limit Conversions <br /> g/L Milligrams/Later Q ppm Di l Dilution Factor 1 ppm = 1000 ppb <br /> g/L Micrograms/Liter o ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> g Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> ' 1414 Stanislaus Street . Fresno, CA 93706-1623 , Phone 559-497-2888, In CA 800-877-8310 � Fax 559-485-6935 <br />