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A N A L Y T I C A L <br /> LABORATORIES <br /> j Certificate of Analysis <br /> Don Light <br /> Del-Tech 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 : 17:45 <br /> Lab Number 98874 Sample Type LIQUID <br /> Project Number Disco <br /> Protect Desc. Ground Water Monitoring <br /> Sample Description MW-9 <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 5.0 1 5 <br /> Di-isopropyl Ether ND µg/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Aroyl Methyl Ether ND µg/L 5.0 1 5 <br /> tent-Butyl Alcohol ND uVL 50 1 50 <br /> ND None Detected P L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> pee, Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> q/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> r <br /> ` 1414 Stanislaus Street 9 Fresno, CA 93706-1623 + Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />