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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Ligght <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 : 18:21 <br /> Lab Number 98875 Sample Type LIQUID <br /> Project Number Disco <br /> Project Desc. Ground Water Monitoring <br /> Sample Description MW-3 <br /> Oxygenates by GUMS 8260M <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND ug/L 5.0 1 5 <br /> Di-isopropyl Ether ND Ag/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND pi/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND pj/L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 <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 /> 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 /> pg/kg Micrograms/Kilogram - ppb Higher limits may result from exceptional sample matrices or interferences <br /> i <br /> 1414 Stanislaus Street 9 Fresno, CA 93706-1623 0 Phone 559-497-2888, In CA 800-877-8310 6 Fax 559-485-6935 <br />