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I <br /> A N A L Y T 'I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Li ht <br /> Del-Tecll Geotechnical Services Preparation Date : 02/23/99 <br /> 10624 Olive Avenue Analysis Date : 02/23/99 <br /> Oakdale, CA 95361 Report Issue Date : 03/30/99 <br /> Sample Date 02/11/99 <br /> Submission Number 9902000483 Sample Time 14:02 <br /> Lab Number 98879 Sample Type LIQUID <br /> Proiect Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-2 <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND ttg/L 5.0 1 5 <br /> Di-isopropyl Ether ND ug/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND ug/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND Ag/L 5.0 1 5 <br /> tert-Butyl Alcohol ND 4/L 50 1 50 <br /> I <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Di Dilution Factor 1 ppm = 1000 ppb <br /> ug/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 /> ug/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> {I 1414 Stanislaus Street • Fresno, CA 93706-1623 • Phone 559-497-2888, to CA 800-877-8310 0 Fax 559-485-6935 <br /> I. <br />