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E <br /> 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 /> Submission Number 9902000483 Sample Date 02/11/99Sample Time 18:00 <br /> Lab Number 98894 Sample Type : LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description NP-1-90' <br /> Oxygenates by GUMS (8260M} <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND Mcg/L 5.0 l 5 <br /> Di-isopropyl Ether ND IZVL 5.0 ] 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 I 5 <br /> t-Amyl Methyl Ether NDL 5.0 1 5 <br /> tert-Butyl Alcohol ND µVL 50 1 50 <br /> E <br /> E ' <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> pg/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 /> yg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferene-^ <br /> V <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 • Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />