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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: 6/11/99 <br /> 1433 N. Market Blvd. Project Number: 21775-237-002 Received: 6/11/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 6128/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A/Quality Control <br /> Sequoia Analyticat.-.Sacramento <br /> Date Spike Sample QC Reporting Limit Recov. RPD RPD <br /> Analyte Analyzed Level Result Result Units Recov, Limits % Limit % Notes* <br /> fiatch; 9060247 Date Prepared: 611W99 Extraction Method: EPA 50108(PITT <br /> Blank 9060247-BLKI <br /> Tert-butyl alcohol 6117/99 ND ug/l 200 <br /> Methyl tert-butyl ether ND 2.00 <br /> Di-isopropyl ether ND 2.00 <br /> Ethyl tert-butyl ether " ND 2.00 <br /> Tert-amyl methyl ether ND 2.00 <br /> Ethanol ND 3000 <br /> Surrogate: 1,2-DCA-d4 50.0 53.0 60.0-140 106 <br /> LCS 9060247-BSI <br /> Methyl tent-butyl ether 6/17/99 50.0 61.8 ug/l 70.0-130 124 <br /> Surrogate: 1,2-DCA-d4 ff 50.0 54.6 60.0-140 109 <br /> 2060247-BSDI <br /> [tert-butyl ether 6117/99 50.0 59.6 ug/l 70.0-130 119 25.0 4.12 <br /> Surrogate: 1,2-DC-444 50.0 51.4 60.0-140 103 <br /> Matrix Spike 9060247-MS1 5206224-05 <br /> Methyl tert-butyl ether 6/17/99 50.0 5.48 67.2 ug/1 60.0-140 123 <br /> Surrogate: 1,2-DCA-d4 50.0 57.6 60.0-140 115 <br /> Matrix Spike Dile 9060247-MSD/ 5906224-05 <br /> Methyl tert-butyl ether 6117/99 50.0 5.48 63.8 ug/l 60.0-140 117 25.0 5.00 <br /> Surrogate: 1.2-DCA-d4 50.0 54.8 60.0-140 110 <br /> Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 7 of 8 <br />