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MA N A L Y T I C A L <br /> LABORATORIES <br /> r� <br /> Certificate of Analysis <br /> Don Liht <br /> i <br /> Del-TecT 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 /> I <br /> Sample Date : 02/10/99 <br /> Submission Number 9902000483 Sample Time : 16:24 <br /> Lab Number 98872 Sample Type : LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-7D <br /> Oxygenates by GUMS {8260M� <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND pg/L 5.0 1 5 <br /> Di-isopropyl Ether ND pg/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND L 5.0 1 5 <br /> t-Amyl Methyl Ether ND uVL 5.0 1 5 <br /> tert-Butyl Alcohol ND pg/L 50 1 50 <br /> i <br /> ND None Detected P L Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dii 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 /> pg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br />- I SII <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 • Phone 559-497-2888, In CA 800.877-8310 • Fax 559-485-6935 <br />