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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Li ht <br /> Del-Tec 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 99020483 Sample Date : 02/11/99Sample Time : 16:13 <br /> Lab Number 98889 Sample Type : LIQUID <br /> Project Number : Disco <br /> P'lect Desc. Ground Water Monitoring <br /> Sample Description MW-1 <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 juVL 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether NDL 5.0 1 5 <br /> tent-Butyl Alcohol ND AVL . 50 1 50 <br /> f <br /> f. <br /> I <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dil Dilution Factor. 1 ppm = 1000 ppb <br /> IKg/L Micrograms/Liter - ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm mg/kg . Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> ,ug/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> i <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2688, In CA 800-877-8310 Fax 559-485-6935 <br />