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i <br /> A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> ii <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 15:48 <br /> Lab Number 98870 Sample Type : LIQUID <br /> Protect Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-7S <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 jcg/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> tert-Butyl Alcohol ND pj/L 50 1 50 <br /> ND None Detected PQL : Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor 1 ppni = 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 /> yg/kg Micrograms/Kilogram — ppb Higher limits may result From exceptional sample matrices or interferences <br /> f. ' <br /> 1414 Stanislaus Street •. Fresno, CA 93706-1623 • Phone 559-497-2888, In CA 800-877-8310 Fax 559-485-6935 <br />