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10 M A N A L Y T I C A L <br /> LABORATOMES <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 15 16 <br /> Lab Number 93698 Sample Type LIQUID <br /> Project Number 07-40-0178 <br /> Protect Desc Escalon <br /> Sample Description W-70-MW-1 <br /> Oxygenates by GC/MS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 50 1 5 <br /> Di-isopropyl Ether ND 1A 50 1 5 <br /> ,Ethyl t-Butyl Ether ND L 50 1 5 <br /> t-Amyl Methyl Ether ND µg/L 50 1 <br /> tert-Butyl Alcohol ND L 50 1 50 <br /> r <br /> r <br /> ND None Detected PQL Practical Quantitation Limit 1 P 1000 ppb <br /> PPM Conversions <br /> g/L illigrams/Liter — ppm Di Dilution Factor 1 p = <br /> M <br /> ug/L Micrograms/Liter — ppb DLRReportable Detection Limit 1 ppb = 0 001 ppm <br /> kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> g Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> r <br /> 1414 Stanislaus Street , Fresno, CA 93706-1623 j Phone 559-497-2888, In CA 800-877-8310 , Fax 559-485-6935 <br />