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A N A L Y T I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services N/ED Preparation Date 07/23/99 <br /> 10624 Olive Avenue Analysis Date 07/23/99 <br /> Oakdale, CA 95361 AUG 2 11999 Report Issue Date 08/03/99 <br /> HUNTER & ASSOC Sample Date 07/09/99 <br /> Submission Number 9907000435 Sample Time 07:00 <br /> Lab Number 120893 Sample Type LIQUID <br /> Project Number <br /> Project Desc. 2nd Qtr. GW Monitoring <br /> Sample Description Trip Blank <br /> Oxygenates by GC/MS 8260M <br /> j Analyte Result Units PQL Dil DLR <br /> Methyl-t-Butyl Ether ND pg/L 5.0 1 5 <br /> Di-isopropyl Ether ND ug/L 5.0 1 5 <br /> Ethyl t-Butyl Ether ND /L 5.0 1 5 <br /> Fi <br /> t-Amyl Methyl Ether ND ug/L 5.0 1 5 <br /> tert•ButyI Alcohol- ND ug <br /> /L <br /> 50 1 50 <br /> ND None Detected PQL Practical Quantitation Limit Conversions: <br /> mg/L Milligrams/Liter — ppm Dir Dilution Factor 1 ppm = 1000 ppb <br /> ug/L Micrograms/Liter o ppb DLR Reportable Detection-Limit 1 ppb = 0.001 ppm <br /> m Milligrams/Kilogram — ppm derived by(PQL x.Dil) <br /> µ Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interferences <br /> • I <br /> 1414 Stanislaus Street • Fresno, CA 93706-1623 • Phone 559-497-2888, In CA 800=877-8310 Fax 559-485-6935 <br />