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TABLE 4 Groundwater Analytical Results Former ARCO Facility No. 2168 441 West Charter Way Stockton, California USEPA METHOD USEPA Method 8015/8020 DHS LUFT USEPA METHOD 8260A 8015(M) Sample ' TPHG Benzene Toluene Ethylbenzene Xylenes 2 MTBE TBA DIPE ETBE TAME 1,2-DCA EDB Ethanol Methano13 MW-1 18,300* 8,600 254 654 650 228 <200 616 <2 0 <2 0 <2 0 <2 0 <3000 <10 0** MW-113 504* 160 690 120 262 <2 0 <200 <2 0 <2 0 <2 0 <2 0 <2 0 <3000 <1 0 MW-1C 53 7* 630 <2 0 <2 0 406 <2 0 1 <200 <2 0 <2 0 <2 0 409 <2 0 <3000 <1 0 MW-2 8,200* 2,310 204 259 322 <2 0 <200 <2 0 <2 0 <2 0 322 <2 0 <3000 <1 0 MW-3 22,900* 9,540 313 2,410 791 127, 244 <2 0 <2 0 <2 0 <2 0 <2 0 <3000 <10 0** MW-4 27,200* 8,180 687 748 1,170 900 392 <2 0 <2 0 <2 0 260 <2 0 <3000 <10 0** MW-5 32,800* 3,460 2,970 664 4,010 <2 0 <200 <2 0 <2 0 <2 0 <2 0 <2 0 <3000 <10 0** MW-6 37,900* 5,290 1,260 1,280 5,570 <2 0 <200 432 <2 0 <2 0 252 <2 0 <3000 <1 0 MW-7 1,590* 222 195 490 102 <2 0 <200 <2 0 <2 0 <2 0 <2 0 <2 0 <3000 <1 0 MW-8 115* <2 0 <2 0 <2 0 <2 0 <2 0 <200 <2 0 <2 0 <2 0 338 <2 0 <3000 <1 0 MW-8B 1,130* 425 496 106 108 <2 0 <200 <2 0 <2 0 <2 0 380 , <2 0 <3000 <1 0 MW-8C 68 5* 156 678 218 758 11 <2 0 <200 <2 0 <2 0 <2 0 <2 0 <2 0 <3000 <1 0 All results m ugll(ppb) TPHG=Total petroleum hydrocarbons as gasoline All samples collected on 8130100 MTBE=Methyl tertiary butyl ether USEPA=U S Environmental Protection Agency TBA=Tertiary Butyl Alcohol 'Sample designation-Boring MWl C, sample depth 10 feet bgs DIPE=Di-isopropyl Ether 2Total Xylenes ETBE=Ethyl Tertiary Butyl Ether 3All samples tested for methanol were outside of USEPA recommended holding time TAME=Tertiary Amyl Methyl Ether *=Chromatogram pattern weathered gasoline C6-C12 1,2-DCA= 1,2-Dichloroethane **=Reporting prints increased due to high concentrations of target analytes EDB=Ethylene Dibromide I DELTA FrontUransfer12168Tablesl 1/27/00 Page 1 of 1 11/27/00