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A N A L Y - T�-- 1,::.0 A L <br /> MLABORATORIff - <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 79706 Sample Type SOLID <br /> Pro,ect Number 3012 E.Waterloo <br /> Project Desc. Advanced Auto <br /> Sample Description Island-S-4' <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 /> ND µg/Kg 20 20 <br /> Di-isopropyl Ether 1 <br /> ND µg/Kg <br /> Ethyl t-Bu 1 Ether 20 1 20 <br /> t-Amyl Methyl Ether ND µg/Kg 20 1 20 <br /> tert-Butyl Alcohol ND µg/Kg 2001. 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 11ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram — ppm derived by(PQL x Dil) <br /> ,u /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 />