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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 WELL DATE 1D SAMPLED MtBE TBA DIPS EtBE TAME 1,2-DCA EDB (ug/L) ((ug/L (ug/L) (u 1L) (ug1L) (ug/L (u-1L MW-3 07/14/99 1 1 ND(25) ND(0 5) ND(0 5) ND(O 5) 11/24/99 ND(5 0) ND(250) ND(5 0) ND(5 0) ND(5 0) — -- 02/17/00 14 ND(25) ND(0 5) ND(0 5) ND(0 5) - -- 06/01/00 1 3 ND(25) ND(0 5) ND(0 5) ND(0 5) _ -- 08/18/00 23 ND(25) ND(0 5) ND(0 5) ND(0 5) 11/04/00 09 ND(25) ND(0 5) ND(0 5) ND(0 5) NO(0 5) ND(0 5) 01/11/01 08 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) NO(5 0) ND(0 5) ND(0 5) ND(O 5) NA NA 11/28/01 ND(0 5) ND(5 0) ND(0 5) ND(0 5) ND(O 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(O 5) ND(0 5) NA NA 11112/02 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 05 ND(5 0) ND(O 5) ND(0 5) ND(0 5) NA NA 07/24/03 ND(O 5) ND(5 0) ND(0 5) ND(O 5) ND(0 5) NA NA 10/20/03 ND(0 5) ND(5 0) NO(O 5) ND(0 5) ND(O 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 05 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(O 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-4 07/14/99 185 ND(25) ND(O 5) ND(0 5) ND(0 5) 11/24/99 175 ND(250) ND(5 O) ND(5 0) ND(5 0) 02/17/00 101 ND(25) ND(0 5) ND(0 5) ND(0 5) 06/01/00 93 50 ND(O 5) ND(0 5) ND(0 5) - 08/18/00 36 ND(25) ND(O 5) ND(0 5) ND(0 5) — - 11/04100 ND(50) ND(2500) ND(50) ND(50) ND(50) ND(50) ND(50) 01/11/01 16 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 1 1 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/28/01 10 ND(5 0) ND(O 5) ND(0 5) ND(0 5) NA NA 03/04/02 07 ND(5 0) ND(O 5) ND(O 5) ND(0 5) NA NA 05/16/02 16 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 07/25/02 1 5 ND(5 0) ND(0 5) ND(0 5) ND(0 5) NA NA 11/12/02 ND(O 5) ND(5 0) ND(0 5) ND(0 5) ND(O 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(O 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) NL5(5 0) ND(0 5) ND(O 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 uglL=micrograms per Liter 1,2 DCA= 1 2 dichloroethane 1 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 ELBE= Ethyl tert-Butyl Ether NA=Not Analyzed 1 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 anal ed via EPA Method 8260 11Time OIIILockefordlTableslSCM&Asmt This As Page 2 of 5