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- ' Sequoia 680 Chesapeake Drive Redwood City,CA 94063 (650) 364-9600 FAX(650)364-9233 404 N. Wiget lane Walnut Creek, CA 94598 (510) 988.9600 FAX(510) 988-9673 Analytical 819 Striker Avenue,Suite 8 Sacramento,CA 95834 (916) 921-9600 FAX (916)92 1-0 100 EMCON -Sac Project: Arco 2186,Stockton,CA Sampled: 6/24/98 1433 N. Market Blvd. Project Number: 21775-237-002 Received: 6/24/98 Sacramento, CA 95834 Project Manager: Dave Foley Re orted: 711619$ Volatile Organic Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Analyte Number Prepared Analyzed Limits Limit Result Units Notes* S 6338-00 WateI Tert-butyl alcohol 8070211 717/98 7/7198 200 ND " Methyl tert-butyl ether 2.00 3.90 " Di-isopropyl ether 2.00 ND " Ethyl tert-butyl ether 2.00 ND " Tert-amyl methyl ether 2.00 ND " Surrogate., 1,2-DCA-d4 60.0-140 116 % 5806338-01 Water Tert-butyl alcohol 8070211 7/7/98 7/7/98 200 ND ug/I Methyl tert-butyl ether 2.00 3.30 " Di-isopropyl ether 2.00 ND " 1 tert-butyl ether " " " 2.00 ND " amyl methyl ether 2.00 ND Surrogate: 1,2-DCA-d4 60.0-140104 % MW-3(371 5806338-02 Water Tert-butyl alcohol 8070211 717198 717/98 200 ND ug/1 Methyl tert-butyl ether 2.00 2.90 " Di-isopropyl ether 2.00 ND " Ethyl tert-butyl ether 2.00 ND Tert-amyl methyl ether 2.00 ND " Surrogate: 1,2-DCA-d4 60.0-140 117 M (3g1 88116338-03 Water Tert-butyl alcohol 8070211 7/7198 7/7198 200 ND ug/l Methyl tert-butyl ether 2.00 18.1 " Di-isopropyl ether 2.00 ND " Ethyl tent-butyl ether 2.00 ND " Tert-amyl methyl ether 2.00 ND " Surrogate: 1,2-DCA-d4 60.0-140 160 % 2 VW-3(38) 8$05338-04 Water Tert-butyl alcohol 8070211 717/98 7/7/98 200 ND ug/l Methyl tert-butyl ether " " 2.00 ND " Di-isopropyl ether " 2.00 ND " 1 ter-butyl ether 2.00 ND " equoia Analytical-Sacramento *Refer to end of report for text of notes and definitions. Ronald W Bobel,Client Services Representative Page 4 of 9 t�