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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 /> I <br /> Sample Date : 02/11/99 <br /> Submission Number - 9902000483 Sample Time : 17:30 <br /> Lab.Number : 98892 Sample Type : LIQUID <br /> Poject Number : Disco <br /> Prrotect Desc. . Ground Water Monitoring <br /> Sample Description NP-1-80' <br /> t . <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND jAg/L 5.0 1 5 <br /> Di-isopropyl Ether ND ug/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND juVL 5.0 1 5 <br /> t-Amyl Methyl Ether ND IAg/L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 <br /> E <br /> E ; <br /> is <br /> I <br /> ND None DetectedPQL Practical Quantitation Limit Conversions: <br /> mg/L MilligramslLiter — ppm Dil Dilution Factor 1 ppm = 1000 ppb <br /> jg/L Micrograms/Liter - ppb DLR Reportable Detection Limit t ppb = 0.001 ppm <br /> 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 /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 559-497-2888, In CA 840-877-8310 • Fax 559-485-6935 <br />