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I <br /> j <br /> A N A L Y T, I C A L <br /> LABORATORIES <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 09/24/98 <br /> Submission Number 9809000817 Sample Time 00:00 <br /> Lab Number 79707 Sample Type SOLID <br /> Pro*ect Number 3012 E.Waterloo <br /> Protect Desc. Advanced Auto <br /> Sample Description TK-1-S-15' <br /> Oxygenates by GC/MS (8260M1 <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND pg/Kg 20 1 20 <br /> Di-isopropyl Ether ND pg/Kg 20 1 20 <br /> Ethyl t-Bu 1 Ether ND pg/Kg 20 1 20 <br /> t-Amyl Methyl Ether ND pg/Kg 20 1 20 <br /> tert-Butyl Alcohol ND pg/Kg 200 1 200 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter = ppm Di Dilution Factor 1 ppm = 1000 ppb <br /> pg/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 /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935 <br />