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N A 1 Y T I C 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 Analysts 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 1424 <br /> ,Lab Number 93697 Sample Type LIQUID <br /> Prolect Number 07-40-0178 <br /> Project Desc Escalon <br /> Sample Description W-68-MW-2 <br /> ' Oxx eng atgs by GC/MS(8260M <br /> nalyte Result Units PQL Dil DLR <br /> ethyl-t-Butyl Ether ND ug/L 50 1 5 <br /> Di-isopropyl Ether ND pg/L 50 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 50 1 5 <br /> ,t-Amyl Methyl Ether ND ttg/L 50 1 5 <br /> Cert-Butyl Alcohol ND pg/L 50 1 50 <br /> ND None Detected P�L Practical Quantitation Limit Conversions <br /> g/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> g/L Micrograms/Liter — 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 /> r <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />