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A N A L Y T <br /> I C A L <br /> LABORATORIES <br /> Certificate of Analysis <br /> Don Light <br /> Del-Tech Geotechnical Services Preparation Date 11/24/98 <br /> 10624 Olive Avenue Analysis Date 11/2 /98 <br /> Oakdale, CA 95361 Report Issue Date 12/02/98 <br /> Submission Number 9811000367 Sample Date 11/13/98 <br /> 1P.ro)ect <br /> ab Number Sample Time 1420 <br /> 86363 Number George & Mae Sample Type LIQUID <br /> roject Desc 1600 Durham Ferry <br /> Sample Description MW 3 <br /> Oxygenates by GC/MS 8260M <br /> nalyte Result Units PQL Dil DLR <br /> ethyl t Butyl Ether ND leg/L 5 0 1 <br /> Di-isopropyl Ether 5 <br /> ND leg/L 5 0 1 <br /> ' yl <br /> t-Butyl Ether ND µg/L 50 1 5 <br /> Amyl Methyl Ether 5 <br /> ert-Butyl Alcohol ND l`g/L 5 0 1 5 <br /> ND ug/L 50 1 50 <br /> N-D None DetectedP L Practical Quantitation Limit Conversions <br /> Milli <br /> grarns/Laer pprn Di.l Dilution Factor 1 ppm - 1000 ppb <br /> Lg//LL Micrograms/Liter ppb DLRReportable Detection Limit i ppb = 0 001 pp- <br /> 10 <br /> illigrams/Kilogram ppm denved by (PQL c Dil) <br /> Micrograms/Kilogram — ppb Higher limits may result from exceptional sample matrices or interterences <br /> 1414 Stanislaus Street - Fresno, CA 93706-1623 s Phone 209-497-2888, In CA 800-877-8310 • Fax 209-485-6935 <br />