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Sequoia 819 Striker Avenue Suite Sacramento,CA 95$58344 (916)921-%00 Analytical FAX(916) 00 www sequolalabs alabs com EMCON/IT-Sacramento Protect ARCO 2186,Stockton,CA Sampled 4/3/00 1433N Market Blvd,#1 Project Number 803883 Received 4/3/00 Sacramento,CA 95834 Project Mana er Dave Foley Reported 4/17/00 Volatile Oxygenate Compounds by EPA Method 8260A Sequoia Analytical-Sacramento Batch Date Date Surrogate Reporting Anal e Number Prepared Analyzed Limits Limit Result Units Notes* MW-1 5004017-01 Water Tert-butyl alcohol 0040079 4/10100 4/10/00 200 ND ug/l Methyl tert-butyl ether 200 281 " Di-isopropyl ether 200 ND " Ethyl tert-butyl ether 200 ND " Tert-amyl methyl ether _ 200 246 " Surrogate 1,2-DCA-d4 " 600-140 848 % MW-2 5004017-02 Water Tert-butyl alcohol 0040079 4110/00 4/10/00 200 ND ug/l Methyl tert-butyl ether " 200 ND " Di-isopropyl ether 200 ND " Ethyl tert-butyl ether " 200 ND " _Tert-amyl methyl ether 2 00 ND " 0911te 12-DCA-d4 _ " 600-140 844 % ---- MW-3 5004017-03 Water Tert-butyl alcohol 0040079 4/10/00 4/I0/00 200 ND ug/1 Methyl tert-butyl ether " 1, 200 ND " Di-isopropyl ether 200 ND " Ethyl tert-butyl ether 200 ND Tert-amyl methyl ether to 200 ND Surrogate 12-DCA-d4 " " " 600-140 82 4 % MW-4 6004017-04 Water Tert-butyl alcohol 0040079 4/10/00 4/10/00 200 ND ug/1 Methyl tert-butyl ether 200 106 " Di-isopropyl ether 200 ND " Ethyl tert-butyl ether 200 ND " Tert-amyl methyl ether 200 ND " Surrogate 1,1-DCA-d4 600-140 828 % VW-3 5004017-05 Water Tert-butyl alcohol 0040079 4/10/00 4/10/00 200 ND ug/l Methyl tert-butyl ether 200 25 2 " Di-isopropyl ether 200 ND " Ethyl tert-butyl ether 200 ND " Tert-amyl methyl ether 200 ND " Surrogate 1,2-DCA-d4 600-140 81 6 % Sequoia Analytical-Sacramento *Refer to end of report for text of notes and definitions Page 4 of 9