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Table 5 Historical Groundwater Analytical Results-Fuel Oxygenates Results in Micrograms per Liter(uglL 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 (ugIL) (ug/L) (uIL (u !L) (u 1L) (uglL) ug1L MW-7 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(D 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 18 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 10/20/03 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 01/05/04 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(D 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 10/04/04 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA MW-8 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(D 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) -- - I 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) N NA 5) 01/11/01 ND(0 5) ND(25) ND(0 5) ND(0 5) ND(0 5) NA N 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 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/25/02 ND(0 5) 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(D 5) ND(0 5) NA NA 10/20/03 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 01/05/04 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(0 5) ND(5 0) ND(0 5 ND(O 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 Methyi Ether Elevated reporting levels are due to high concentration of non-target analytes requiring sample dilution 1) Well was reportedly dry during gauging on 10120103, 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 L 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 1 Mme 0i1\LockefordlTableslSC1V1 8 Asmt TbIS xis Page 4 of 5