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A N A L Y T I C A L .. <br /> LABORATORIES <br /> Certificate of Analysis <br /> Ra yy Kablanow <br /> Del-Tech Geotechnical Services Preparation Date 05/10/99 <br /> 10624 Olive Avenue Analysis Date 05/10/99 <br /> Oakdale, CA 95361 Report Issue Date 05/11/99 <br /> Sample Date 05/07/99 <br /> Submission Number 9905000199 Sample Time 00:00 <br /> Lab Number 110835 Sample Type SOLID <br /> Project Number 795.5 <br /> Project Desc. DTQefferson) <br /> Sample Description SP-1 <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/Kg 20 1 20 <br /> Di-isopropyl Ether ND µg/Kg 20 1 20 <br /> Ethyl t-Butyl Ether ND µg/Kg 20 1 20 <br /> t-Amyl Methyl Ether ND µg/Kg 20 1 20 <br /> tert-Butyl Alcohol ND µg/Kg 200 1 200 <br /> ND None DetectedPQL 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 /> µg/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 0 Phone 559-497-2888, In CA 800-877-8310 • Fax 559-485-6935 <br />