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TABLE 2 GROUNDWATER ANALYTICAL RESULTS FOR OXYGENATES ARCO Service Station No 2130 . 7906 North EI Dorado Street, Stockton, California Well Sample TBA MtBE DIPS ETBE TAME Number Date mg/L mg/L mg/L mg/L mg/L MW-7 11/19/97 NA NA NA NA NA 03/05/98 <100 <2 <2 <2 <2 06/26/98 <100 <2 <2 <2 <2 09/01/98 <100 <2 <2 <2 <2 12/02/98 <200 <2 <2 <2 <2 03/31/99 <200 <2 <2 <2 <2 06/04/99 <200 <2 <2 <2 <2 09/02/99 <200 <2 <2 <2 <2 11/29/99 <200 <2 <2 <2 <2 03/16/00 <200 <2 <2 <2 <2 06/26/00 <100 <2 <2 <2 <2 09/28/00 <200 <2 <2 <2 <2 12/19/00 <200 <2 <2 <2 <2 03/15/01 <200 <2 <2 <2 <2 06/20/01 <100 <2 <2 <2 <2 09/12/01 <200 <2 <2 <2 <2 12/12/01 <5 0 <0 50 <0 50 <0 50 <0 50 03/13/02 <5 0 <0 50 <0 50 <0 50 <0 50 06/18/02 <5 0 <0 50 <0 50 <0 50 <0 50 © 09/11/02 <5 0 <0 50 <0 50 <0 50 <0 50 MW-10 11/19/97 NA NA NA NA NA 03/05/98 <250* <5* <5* <5* <5' 06/26/98 <100 <2 <2 <2 <2 09/01/98 <100 <2 <2 <2 <2 12/02/98 <200 <2 <2 <2 <2 03/31199 <200 <2 <2 <2 <2 06/04/99 <200 <2 <2 <2 <2 09/02/99 <200 <2 <2 <2 <2 11/29/99 <200 <2 <2 <2 <2 03/16/00 <200 <2 <2 <2 <2 06/26/00 <100 <2 <2 <2 <2 09/28/00 <200 <2 <2 <2 <2 12/19/00 <200 <2 <2 <2 <2 03/15/01 Well Covered 06/20/01 <100 <2 <2 <2 <2 09/12/01 Well Covered 12/12/01 Well Covered 03/13/02 Well Covered 06/18/02 Well Covered 09/11/02 Well Covered USEPA=U S Environmental Protection Agency TBA=Tertiary butyl alcohol MtBE=Mothyl tert butyl ether <=Below detection limit for analytical methods used DIPE=Di isopropyl ether NA=Not analyzed ETBE=Ethyl tert-butyl ether `Reporting limits raised due to matrix effects and/or other factors TAME=Teri-amyl methyl ether mg/L= micrograms per liter k V5 BP ARC01021301Qu—FJyV3_QTR 02\. reo_2130_3QMR02 4of4