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A N A L Y T I C A L <br /> LABORATORIES <br /> r <br /> : Certificate of Analysis <br /> Don Light <br /> �. Del-Tech Geocechnical 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 /> I Sample Date 02/11/99 <br /> Submission Number 9902000483 Sample Time 10:22 <br /> Lab Number 98876 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-10 <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> { Methyl-t-Butyl Ether ND ug/L 5.0 1 5 <br /> Di-isopropyl Ether ND 1,g/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND Pg/L 5.0 1 5 <br /> { t-Amyl Methyl Ether ND 14g/L 5.0 1 5 <br /> tert-Butyl Alcohol ND pg/L 50 1 50 <br /> r <br /> i . <br /> I <br /> P . <br /> l ; <br /> i ND None Detected PQL Practicaluantitation Limit <br /> Conversions: <br /> mg/L Milligrams/Liter — ppm Di Dilution Factor 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 /> J1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />