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+ Sequoia 819 Striker Avenue, Suite 8 <br /> j '1 Sacramento, CA 95834 <br /> AnalyAnalytical <br /> tical FAX(916)921-0 1 o0 <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/17/99 <br /> 1433 N. Market Blvd. Project Number: N/A Received: 6117199 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 6121199 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control. <br /> Sequoia Analytical-Saciamentd' <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Anal e Analyzed Level Result Result Units Recov. Limits % Limit % Notes* <br /> Batch: 9066 Extraction Method: FPA 5030IJM!e0HI <br /> JUlank 9p60271-13LK1 <br /> Tert-butyl alcohol 6117199 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND OJ0 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Tert-amyl methyl ether ND 0.100 <br /> Ethanol ND 150 <br /> Surrogate: 1,2-DCA-d4 2.50 2.52 60.0-140 101 <br /> LSA 9-0.60271-BSI <br /> Methyl tert-butyl ether 6117199 2.50 2.62 mg/kg 70.0-130 105 <br /> Surrogate: 1,2-DC444 2.50 2.46 60.0-140 98.4 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 4 of 5 <br />