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A N A L Y- T L - C A L <br /> FDTQ <br /> wbjR LAB 0RAT ORI <br /> ES` <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date 10/06/98 <br /> 10624 Olive Avenue Analysis Date 10/06/98 <br /> Oakdale, CA 95361 Report Issue Date 10/.15/98' <br /> Sample Date 09/23/98 <br /> Submission Number 9809000817 Sample Time 00:00 <br /> Lab Number 79705 Sample Type SOLID <br /> Pro*ect Number 3012 E.Waterloo <br /> Project Desc. Advanced Auto <br /> Sample Description Island-N-4' <br /> Oxygenates by GUMS (8260M) <br /> Analyte Result Units PQL Dil DLR <br /> Meth 1-t-Bu 1 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-Am 1 Meth 1 Ether ND Itg/Kg 20 1 20 <br /> tert-Butyl Alcohol N. D. ug/Kg 200 1 200 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dif 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 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935 <br />