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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 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 f <br /> Submission Number 9902000483 Sample Time 17:00 <br /> Lab Number 98891 Sample Type LIQUID <br /> Protect Number Disco <br /> Protect Desc. Ground Water Monitoring <br /> Sample Description NP-1-70' <br /> Oxygenates by GUMS (8260M) `. <br /> Analyte Result Units PQL DiI DLR <br /> Methyl-t-Butyl Ether ND /L 5.0 1 5 <br /> Di-isopropyl Ether ND gVL 5.0 I 5 <br /> Ethyl t-Butyl Ether NDL 5.0 . 1 5 <br /> t-Amyl Methyl Ether ND µg//L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 { <br /> I <br /> ND : None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L : Milligrams/Liver - ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> ,ug/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 /> ttg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interfere s <br /> I . <br /> 1414 Stanklaus Street • Fresno, CA 93706-1623 - Phone 559-497-2888, 1n CA 800-877-8310 • Fax 559-485-6935 <br />