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Sequoia 819 Striker Avenue,Suite 8 <br /> Sacramento,CA 95834 <br /> (916)921-9600 <br /> Analytical <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/Quality 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: 9060271 Date Prepared: 6/18/99 Extraction Method: EPA 5030B [ OH] <br /> Blank 9060271-BLKI <br /> Tert-butyl alcohol 6/17/99 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 /> 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 /> LCS 9060271-BSI <br /> Methyl tert-butyl ether 6/17/99 2.50 2.62 mg/kg 70.0-130 105 <br /> Surrogate: 1,2-DCA-d4 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 />