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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech GeMechnical Services Preparation Date 02/22/99 <br /> 10624 Olive Avenue Analysis Date 02/22/99 <br /> Oakdale, CA 95361 Report Issue Date 03/30/99 <br /> Sample Date 02/10/99 <br /> Submission Number 9902000483 Sample Time 13:11 <br /> Lab Number 98867 Sample Type LIQUID <br /> i Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-6 <br /> a° Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> 1. Methyl-t-Butyl Ether ND /L 5.0 1 5 <br /> 1 Di-isopropyl Ether ND ILVL 5.0 1 5 <br /> Ethyl t-Butyl Ether ND ug/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> tort-Butyl Alcohol ND uVL 50 1 50 <br /> I <br /> ND None DetectedPQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter - ppm Dil Dilution Factor t ppm = 1000 ppb <br /> pg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> µg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> r <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 9 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />