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A N A L Y T I C A L j <br /> LABORATORIES <br /> �4 <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date 09/11/98 <br /> 10624 Olive Avenue ! Analysis Date 09/11/98 <br /> Oakdale, CA 95361 ## Report Issue Date 09/23/98 <br /> '1 Sample Date 09/08/98 <br /> Submission Number 9809000283 Sample Time 13:45 <br /> Lab Number 76894 i; Sample Type LIQUID <br /> Project Number <br /> Protect Desc. Calif.Welding,Tracy {� <br /> Sample Description MW-1 <br /> Oxygenates by GC/MS (826�OM,� <br /> Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 5.0 1 5 <br /> Di-isopropyl Ether ND µg/L ii 5.0 1 5 <br /> Ethyl t-Butyl Ether ND µg/L 5.0 1 5 <br /> t-Amyl Methyl Ether ND µg/L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L50 1 50 <br /> ,f <br /> 4 <br /> L <br /> I <br /> si <br /> it <br /> t <br /> ! <br /> �i <br /> .r <br /> �i <br /> i <br /> ;j <br /> 1! 1,7-1=1V ED <br /> 'i OCT 14 1998 <br /> HUN i -Lr: u ASSOC <br /> j� <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Di Dilution Factor j 1 ppm = 1000 ppb <br /> µg/L Micrograms/Liter — ppb DLR Reportable Detection Limit 1 ppb = 0.001 ppm <br /> mg/kg Milligrams/Kilogram a ppm derived by (PQL x Dil)j <br /> µQ/kg Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> 1 I <br /> �1 <br /> i <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 209-497-28818, In CA 800-877-8310 • Fax 209-485-6935 <br />