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I <br /> A N A L Y ' T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date c 02/22/99 <br /> 10624 Olive Avenue Analysis Date 02/22/99 <br /> Oakdale, CA 95361 Report Issue Date 03/30/99 <br /> r 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 /> Prolect Desc. Ground Water Monitoring <br /> Sample Description MW-4 <br /> Oxygenates by GUMS (8260M) <br /> I . <br /> Analyte Result Units PQL Dil. DLR <br /> ' Methyl-t-Butyl Ether ND µg/L 5.0 1 5 <br /> Di-isopropyl Ether ND Ag/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND ug/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND jug/L 5.0 1 5 <br /> tent-Butyl Alcohol ND }cg/L 50 1 50 <br /> i <br /> i <br /> ND None Detected P L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Di 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 /> F.g/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> f <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, in CA 800-877-8310 Fax 559-485-6935 <br /> 1 ' <br />