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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br />'John Pfeiffer <br /> BSK & Associates, Sacramento Preparation Date 06/28/99 <br /> 3140 Gold Camp Drive Suite 160 Analysis Date 06/28/99 <br />'Rancho Cordova, CA 95670 Report Issue Date 07/07/99 <br /> Sample Date 06/19/99 <br />'Submission Number 9906000595 Sample Time 1112 <br /> Lab Number 116985 Sample Type LIQUID <br /> Protect Number 0740-0178 <br /> Prolect Desc Greer Property <br />'Sample Description W-68-MW-4 <br /> Oxygenates by GC/MS (8260M) <br />'Analyte Resent Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 5 0 1 5 <br /> Di-isopropyl Ether ND µg/L 5 0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 50 1 5 <br /> t Amyl Methyl Ether ND µg/L 50 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 <br /> 1� <br /> I <br /> I <br /> ND None Detected PQL Practical Quantitation Limit Conversions <br /> lmg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> µ Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0 001 ppm <br /> g AUigrams/Kilogram s ppm derived by(PQL x Dd) <br />' g 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 />