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819 Striker Avenue, Suite 8 <br /> 4D Sequoia Sacramento,CA 95834 <br /> Analytical (96)921-9600 <br /> FAX(9116)921-0100 <br /> EMCON/Pinnacle-Sacramento Project: ARCO 2186, Stockton, CA Sampled: 9/10/99 <br /> 1433 N.Market Blvd, Project Number: 792232 Received: 9/13/99 <br /> Sacramento,CA 95834 Project Manager: Dave Foley Reported: 9127/99 <br /> Volatile Oxygenate Compounds by EPA Method 8260A <br /> Sequoia Analytical-Sacramento <br /> Batch Date Date Surrogate Reporting <br /> J` Analyte Number Prepared Analyzed Limits Limit Result Units Notes* <br /> M W-1(73') S909157-01 Water <br /> Tert-butyl alcohol 9090110 9/15/99 9/15/99 400 ND ug/1 D <br /> Methyl tert-butyl ether 4.00 800 D <br /> Di-isopropyl ether 4.00 ND D <br /> Ethyl tert-butyl ether 4.00 ND D <br /> Tert-aryl methyl ether 4.00 8.12 D <br /> Surrogate 1,2-DCA-d4 60.0-140 109 % <br /> MW-2(74') S909157-02 Water <br /> Tert-butyl alcohol 9090110 9/15/99 9/15/99 200 ND ug/l <br /> Methyl tert-butyl ether 2.00 3.64 " <br /> Di-isopropyl ether 2.00 ND " <br /> Ethyl tert-butyl ether " 2.00 ND " <br /> Tert-amyl methyl ether 2.00 _ ND <br /> Surrogate: 1,2-DCA-d4 60.0-140 106 % <br /> 3(73'1 5909157-03 Water <br /> Tert-butyl alcohol 9090110 9/13/99 9/13/99 200 ND ug/l <br /> Methyl tent-butyl ether 2.00 ND " <br /> Di-isopropyl ether 2.00 ND " <br /> Ethyl tert-butyl ether 2.00 ND " <br /> Tert-amyl methyl ether 2.00 ND " <br /> Surrogate: 1,2-DCA-d4 F0 " 60.0-140 112 % <br /> MW-4(61 1) S909157-04 Water <br /> Tert-butyl alcohol 9090110 9/15/99 9/15/99 1000 ND ug/1 D <br /> Methyl tert-butyl ether 10.0 1060 D <br /> Di-isopropyl ether 10.0 ND D <br /> Ethyl tert-butyl ether 10.0 ND D <br /> Tert-amyl methyl ether 10.0 ND D <br /> Surrogate: 1,2-DCA-d4 " " 60.0-140 .115 % <br /> VW-3(60') 5909157-05 Water <br /> Tert-butyl alcohol 9090110 9/15/99 9/15/99 1000 ND ug/l D <br /> Methyl tert-butyl ether 10.0 1500 D <br /> Di-isopropyl ether 10.0 ND D <br /> Ethyl tent-butyl ether 10.0 ND D <br /> Tert-amyl methyl ether 10.0 12.3 D <br /> Surrogate: 1,2-DCA-d4 " 60.0-140 110 % <br /> is Analytical-Sacramento *Refer to end of report for text of notes and definitions. <br /> Page 4 of 9 <br />