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A N A L Y T I C A L <br /> LABORATORIES <br /> F <br /> Certificate of Analysis <br /> Don Liht <br /> Del-TecT 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 13:11 <br /> Lab Number 98867 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. : Ground Water Monitoring <br /> Sample Description MW-6 <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 �L 5.0 1 <br /> i tert-Butyl Alcohol ND L 50 1 50 <br /> I ' <br /> i <br /> i <br /> I <br /> I ! <br /> f <br /> t <br /> f <br /> 1 ND None Detected <br /> � PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — rn Dil . Dilution Factor 1 b <br /> PP ppm 1000 PP <br /> Ag/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 /> 11 1'g/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> II <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2886, In CA 800-877-8320 Fax 559-485-6935 <br />