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I Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650) 364-9233 <br /> Sequoia 404 N.Wiget Lane Walnut Creek CA 94598 (9Z5)988-9600 FAX(9Z5)988-9673 <br /> Analytical 819 Striker Avenue,Suite 8 Sacramento.CA 95834 (916)921-9600 FAX(916)9Z1-0100 <br /> 1455 McDowell Blvd. North.Ste. D Petaluma,CA 94954 (707)792-1865 FAX(707) 792-0342 <br /> EMCON -Sac Project: ARCO 2186, Stockton, CA Sampled: 12/14/98 <br /> 1433 N. Market Blvd. Project Number: 21775-237-003 Received: 12/15/98 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 12/31/98 <br /> Volatile Organic Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> Analyte Number Prepared Analyzed Limits Limit Result Units Nates* <br /> - 5812213-05 Water <br /> rent-amyl methyl ether 8120321 12/18/98 12/18/98 2.00 5.1I ug/l <br /> surrogate: 1,2-DC,4 44 60.0-140 114 <br /> S$11213.0.6 Water <br />^ert-butyl alcohol 8120321 12/18/98 12/18/98 200 ND ug/1 <br /> vlethyl tert-butyl ether 2.00 31.4 " <br />)i-isopropyl ether 2.00 ND " <br /> ithyl tert-butyl ether 2.00 ND " <br />'ert-amyl methyl ether 2.00 ND " <br />'arrogate: 1,2-DC.4-d4 60.0-140 111 <br /> i� <br /> luoia Analytical -Sacramento *Refer to end of report for text of notes and definitions. <br /> nald W. Bobel,Client Services Representative Page 5 of 9 <br />