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_ rf <br /> A N A L Y `T „I:;.:;.0 A. . W <br /> LABORATORIESL. . <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services _ Preparation Date 10/03/98 <br /> Analysis Date 10/03/98 <br /> 10624 Olive Avenue <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 79702 Sample Type SOLID <br /> Pro*ect Number 3012 E.Waterloo <br /> Pro1ject Desc. Advanced Auto <br /> Sample Description TK-3-S-15' <br /> Oxygenates by GC/MS (8260M) <br /> Analyte <br /> Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/Kg 20 1 20 <br /> Di-isopropyl Ether ND µg/Kg 20 1 220 <br /> 0 <br /> Ethyl t-Butyl Ether ND µg/Kg 20 1 20 <br /> t-Am 1 Methyl Ether ND µg/Kg 20 1 <br /> tert-Butyl Alcohol ND µg/Kg 200 1 200 <br /> ND None Detected PQL Practical Quantitation Limit Conversions:1 ppm 1000 ppb <br /> mg/L Milligrams/Liter = ppm Di Dilution Factor ` = <br /> 1 ppb 0.001 ppm <br /> µg/L Micrograms/Liter — ppb .DLR Reportable Detection Limit <br /> = <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 />