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Table 5 Historical Groundwater Analytical Results-Fuel Oxygenates Results in Micrograms per Liter(ug1L or ppb) Time Oil Company-Property 04-049 14000 East Highway 88 Lockeford,California WELL7 DATE 1D SAMPLED MtBE TBA DIPE EtBE TAME 1,2-DCA EDB uglL) ug1L (ug1L) (u 1L) (ug1L) ug1L (u-1L) M_W 5 07/14/99 73 ND(25) ND(0 5) ND(0 5) ND(0 5) 11/24/99 49 ND(25) ND(0 5) ND(0 5) ND(0 5) -- 02/17/00 09 ND(25) ND(0 5) ND(0 5) ND(0 5) -- -- 06/01/00 66 ND(25) ND(0 5) ND(0 5) ND(0 5) _= 08/18/00 66 ND(25) ND(0 5) ND(0 5) ND(0 5) 11/04/00 22 ND(25) ND(0 5) ND(0 5) ND(0 5) ND(0 5) ND(0 5) 01/11/01 1 6 ND(25) ND(0 5) ND(0 5) ND(0 5) NA NA 04/27/01 09 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 05 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 05/16/02 NS NS NS NS NS NS NS 07/25/02 NS NS NS NS NS NS NS 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 NS NS NS NS NS NS NS 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' NS NS NS NS NS NS NS 04101104' NS NS NS NS NS NS NS 07123104° NS NS NS NS NS NS NS 10104104' NS NS NS NS NS NS NS MW_; 07/14/99 11 ND(25) ND(0 5) ND(0 5) ND(0 5) 11/24/99 06 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) -- -- 1 08/18/00 11 ND(25) ND(0 5) ND(0 5) ND(0 5) -- -- 11/04/00 05 ND(25) ND(0 5) ND(0 5) ND(0 5) 06 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 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(0 5) ND(0 5) NA NA 10/20/03 ND(0 5) ND(5 0) ND(0 5) ND(O 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(0 5) ND(0 5) NA NA Nates 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 10/20/03 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 ' 1\Time Od\Lockeford\Tables\SCM 8 Asmt Tbls xls Page 3 of 5