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i <br /> A N A L Y T I C A L <br /> LABORATORIES <br /> r <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical 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 15:00 <br /> Lab Number 98869 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-4 <br /> ,F Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLA <br /> Methyl-t-Bu I Ether <br /> Y ty ND pg/L 5.0 1 5 — <br /> Di-isopropyl Ether ND AWL 5.0 1 5 <br /> Ethyl t-Butyl Ether ND ug/L 5.0 I 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> tert-Butyl Alcohol ND uj/L 50 1 50 <br /> 3 <br /> ND None Detected P L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter – ppm Dil Dilution ctor 1 ppm = 1000 ppb <br /> µg/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 • Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />