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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical FAX(916)921-0100 <br /> EMCON-Sac Project: ARCO 2186,Stockton,CA Sampled: 6/21/99 <br /> 1433 N.Market Blvd. Project Number: 21775-237-002 Received: 6/21/99 <br /> Sacramento,CA 95834 Project Manager: Mark Capps Reported: 6/22/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/QuaIity Control <br /> Sequoia Analytical-Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov.Limits % Limit % Notes* <br /> Batch: 9060309 Date Prepared: 6/21/99 Extraction Method: EPA 5030B[MeOH] <br /> Blank 9060309-BLK1 <br /> Tert-butyl alcohol 6/21/99 ND mg/kg 10.0 <br /> Methyl tert-butyl ether ND 0.100 <br /> Di-isopropyl ether ND 0.100 <br /> Ethyl tert-butyl ether ND 0.100 <br /> Ter -amyl methyl ether ND 0.100 <br /> Ethanol ND 150 <br /> Surrogate: 1,2-DCA-d4 2.50 2.33 60.0-140 93.2 <br /> LQS 9060309-BSI <br /> Methyl tert-butyl ether 6/21/99 2.50 2.49 mg/kg 70.0-130 99.6 <br /> Surrogate: 1,2-DCA-d4 2.50 2.36 60.0-140 94.4 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 4 of 5 <br />