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A N A L Y T I.. : C A L <br /> LABORATORIES` <br /> Certificate of Analysis <br /> Don Light Preparation Date 10/03/98- <br /> Del-Tech Geotechnical Services - Analysis Date 10/03/98 <br /> 10624 Olive Avenue Report Issue Date 10/15/98 <br /> Oakdale, CA 95361 <br /> Sample Date 09/23/98 <br /> Submission Number 9809000817 Sample Time 00:00 <br /> Lab Number 79700 Sample Type SOLID <br /> Protect Number 3012 E.Waterloo <br /> Project Desc. Advanced Auto <br /> Sample Description TK-2-N-15' <br /> Oxygenates by GC/MS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> ND µg/Kg 20 1 20 <br /> Methyl-t-Butyl Ether SK 20 1 20 <br /> Di-isopropyl Ether ND Jug Kg 20 1 20 <br /> Ethyl t-Butyl Ether ND µg/Kg 20 1 20 <br /> t-Amyl Methyl Ether ND µg/Kg 200 1 200 <br /> tert-Butyl Alcohol <br /> Q <br /> ND None Detected ions: <br /> s <br /> PQL Practical Quantitation Limit � ppm Conversions: <br /> 000 ppb <br /> mg/L Milligrams/Liter — ppm Di Dilution Factor 1 Ppb = 0.001 ppm <br /> µg/L Micrograms/Liter — ppb . DLR Reportable Detection Limit <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> µg/kg Micrograms/Kilogram = ppb Higher limits may result from exceptional sample in or interferences <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935 <br />