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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> 4D,,,F Analytical (916) 921-9600 <br /> FAX(916) 921-0100 <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 1433 N. Market Blvd. Project Number: N/A Received: 6/17/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 6/21/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> T-1-N(17')(continued) 5906308-05 &( <br /> Surrogate: 1,2-DCA-d4 60.0-140 92.8 % D <br /> 1-1-S(17') S906308-06 so <br /> Tert-butyl alcohol 9060271 6/18/99 6/17/99 20.0 ND mg/kg D <br /> Methyl tert-butyl ether 0.200 20.0 D <br /> Di-isopropyl ether 0.200 ND D <br /> Ethyl tert-butyl ether 0.200 ND D <br /> Tert-amyl methyl ether 0.200 ND D <br /> Surrogate: 1,2-DCA-d4 60.0-140 74.8 % D <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 3 of 5 <br />