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Table 5 Historical Groundwater Analytical Results-Fuel Oxygenates Results in Micrograms per Liter(ug/L or ppb) Time Oil Company-Property 04-049 14000 East Highway 88 Lockeford,California WELL DATE ID SAMPLED MtBE TBA DIPE EtBE TAME 1,2-DCA EDB u IL) (ug/L) (u /L) (ug/L) (ug/L) (ug/L) (u-1Lj MW-9 07/14/99 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) 11/24/99 ND(O 5) ND(25) ND(0 5) ND(0 5) ND(0 5) -- — 02/17/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) -- - 06/01/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) 08/18/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) 11/04/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 01/11/01 05 ND(25) ND(0 5) ND(0 5) ND(0 5) NA NA 04/27/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 08/20/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/28/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 03/04/02 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 05/16/02 06 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/25/02 06 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/12/02 06 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 01/16/03 13 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 05/15/03 29 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/24/03 11 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 10/20/03 15 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 01/05/04 24 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 04/01/04 32 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/23/04 20 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 10/04/04 23 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA MW-10 07/14/99 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) -- -- 11/24/99 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) 02/17/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) 06/01/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) -- ' 08/18/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) -- - 11/04/00 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 01/11/01 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) NA NA 04/27/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 1 08/20/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/28/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 03/04/02 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 05/16/02 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA ' 07/25/02 22 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/12/02 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 01/16/03 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 05/15/03 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/24/03 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 10120103` NS NS NS NS NS NS NS 01105104' ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 04/01/04 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA ' 07/23/04 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 10/04/04 ND(O 5) ND(5 0) ND 0 5) ND(0 5) ND(0 5) NA NA Notes ug1L=micrograms per Liter 1,2 DCA=1,2 dichloroethane ' MtBE=Methyl Tert-Butyl Ether EDB= 1,2 dibromoethane TBA=Tert-Butanol ND=Not Detected at or above the reported detection limits DIPE=Di-isopropyl Ether NS=Not Sampled EtBE=Ethyl tert-Butyl Ether NA=Not Analyzed ' TAME=Tert-Amyl Methyl Ether * Elevated reporting levels are due to high concentration of non-target analytes requiring sample dilution 1) Well was reportedly dry during gauging on 10120/03, 115104 and 411104 2) Water levels dropped 0 35'within monitoring well MW-10 following initial gauging of site wells The well was not sampled on 10/20/03 due to an insufficient amount of water in the well 3) Grab sample 4) Insufficient amount of water to sample well Listed concentrations were analyzed via EPA Method 8260 ' I Mme 0dIL0ckefordlTableslSCM&Asmt Tbls xls Page 5 of 5