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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 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 14:37 <br /> Lab Number 98882 Sample Type LIQUID <br /> I Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-SVE SOUTH <br /> �. <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND jcg/L 5.0 1 5 <br /> Di-isopropyl Ether ND ug/.L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND 1AWL 5.0 1 5 <br /> jtent-Butyl Alcohol ND µg/L 50 1 50 <br /> I <br /> ND None Detected P L : Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> jug/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 /> r <br /> I <br /> 1414 Stanislaus Street 0 Fresno, CA 93706-1623 9 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />