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Table 4 Historical Groundwater Analytical Results Results in Micrograms per Liter(ug1L or ppb) • Time Oil Company-Property 04-049 14000 East Highway 88 Lackeford California WELL DATE ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE (ug/L (ug/L u IL (ug/L (ug/L u1L MW-10 07/19/96 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 - 12/19/96 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 02/26/97 36 28 08 36 256 79 04/16/97 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 07114!97 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<50 10113!97 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<50 01!27198 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<50 04/28196 ND<0 5 ND<0 5 ND<0 5 ND<0 5 545 ND<5 0 08/13/98 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 10/26/98 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<50 01/27/99 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<50 04/26/99 ND<0 5 ND<0 5 ND<0 5 N0<0 5 ND<50 ND<50 07/14/99 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 11/24/99 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 02/17/00 ND<0 5 09 ND<0 5 29 62 ND<0 5 06!01100 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 08118100 ND<0 5 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<0 5 11104!00 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 01!11!01 N0<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 04/27/01 ND<0 5 ND<0 5 ND<0,9 ND<1 0 ND<50 ND<0 5 08/20/01 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 11/28/01 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<0 5 03/04/02 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 • 05/16/02 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 07/25/02 ND<0 5 ND<0 5 N0<0 5 ND<0 5 ND<50 22 11/12/02 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 01116!03 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 05115103 ND<0 5 ND<0 5 ND<0 5 37 ND<50 ND<0 5 07124!03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 10!20!033 NS NS NS NS NS NS 01/051044 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 04/01/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 07/23/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 10/04/04 ND<0 5 ND<0 5 ND<0 5 N0<15 ND<50 ND<0 5 MCL s 1 150 300 1750 13 NOTES ug1L=micrograms per Liter ppb=parts per billion TPHg=Total Petroleum Hydrocarbons as gasoline MtBE=Methyl tert-Butyl Ether by Method 8020 through 4126199 by 8260 thereafter ND=Not Detected at or above the reported detection limits NS=Not Sampled MCL's=Maximum Contaminant Levels for California drinking water reported by the California Department of Health Services 'Title 22 California Code of Regulations as of September 12 2003 '=Elevated reporting levels are due to high concentration of non-target analytes requiring sample dilution 1) Monitoring well MW-5 went dry during purge on 05/16/02 and did not recharge 2) Well was reportedly dry during gauging on 10!20!03 1!5104 and 411104 3) Water levels dropped 0 35'within monitoring well MW-10 following initial gauging of site wells The well was not sampled on 10120!03 due to an insufficient amount of water in the well 4) Grab sample 5) Insufficient amount of water to sample well 6) Sample chromatogram does not match the standard gasoline chromatogram I(Time OdlLockeferdlTahleslSCM 8 Asmt This As Page 10 of 10