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A N A L Y T I C A L <br /> LABORATORIES [j <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services <br /> is Preparation Date : 09/11/98 <br /> 10624 Olive Avenue Analysis Date : 09/11/98 <br /> Oakdale, CA 95361 Report Issue Date : 09/23/98 4 <br /> Submission Number 9809000283 Sample Date 09/08/98 <br /> Lab NumberSample Time 13:33 <br /> 76893 <br /> Project Number Sample Type LIQUID <br /> Protect Desc. Calif. Welding, Tracy it <br /> Sample <br /> Sample Description MW-3 4 <br /> Oxygenates by GC/MS (8260m) <br /> ilAnalyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND µg/L 5.0 1 5 <br /> Di-isopropyl Ether ND µg/L 5.0 1 5 <br /> Ethyl t-Butyl Ether NDyL " 5.0 i <br /> t-Amyl Methyl Ether ND g/L 5.0 1 5 <br /> tert-Butyl Alcohol ND µg/L 50 1 50 <br /> �i <br /> , <br /> :r <br /> ii <br /> RECEIVED <br /> 0 C T 14 1998 <br /> E <br /> HUiv i :, K�SSOC � <br /> ti <br /> Jf <br /> ND None DetectedPQL Practical Quantitation Li" it Conversions: <br /> mg/L Milligrams/Liter — ppm Di 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) ;f <br /> µQ�4� Micrograms/Kilogram = ppb Higher limits may result from exceptional sample matrices or interferences <br /> i <br /> 1414 Stanislaus Street Fresno, CA 93706-1623 Phone 209-497-2888, In CA 800-877-8310 Fax 209-485-6935- <br /> �I \ <br />