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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 Lockeford Cahfomla WELL DATE ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE (ug/L (ug/L (ug/L u 1L (u/L u 1L MW-9 07/19/96 14 ND<0 5 ND<0 5 ND<0 5 ND<50 12119/96 140 90 86 173 2400 --- 02126/07 -- 02126/97 119 674 470 248 1570 --- 04/116/97 --04!16197 9 4 06 14 42 95 07114/97 25 ND<0 5 ND<0 5 ND<0 5 141 10/13/97 25 ND<0 5 ND<0 5 ND<0 5 103 ND<5 0 01/27/98 ND<0 5 16 ND<0 5 ND<0 5 61 ND<5 0 04/26/98 15 ND<0 5 ND<0 5 06 137 ND<5 0 08/13/98 13 ND<0 5 ND<0 5 ND<0 5 825 ND<5 0 10/26/98 28 ND<0 5 ND<0 5 ND<0 5 765 ND<5 0 01/27/99 33 ND<0 5 ND<0 5 06 173 ND<5 0 04/26/99 20 ND<0 5 ND<0 5 ND<0 5 91 ND<5 0 07/14/99 17 ND<0 5 ND<0 5 ND<0 5 69 ND<0 5 11/24/99 13 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 02117/00 52 ND<0 5 07 46 124 ND<0 5 06101/00 77 ND<0 5 ND<0 5 ND<0 5 51 ND<0 5 08/18100 11 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<0 5 11/04/00 16 ND<0 5 ND<0 5 ND<1 0 539 ND<0 5 01/11/01 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 05 04/27/01 056 ND<0 5 ND<0 5 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 06/16/02 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 06 07/25/02 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 06 11112J02 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 06 01/16/03 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 13 05/15/03 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 29 07124/03 07 ND<0 5 ND<0 5 ND<1 0 ND<50 11 10120/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 15 01/05/04 N0<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 24 04/01/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 32 07/23/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 20 10/04/04 ND<0 5 ND<0 5 ND<0 5 ND<1 5 ND<50 23 NOTES uglL=micrograms per Liter ppb=parts per billion TPHg=Total Petroleum Hydrocarbons as gasollne 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 115104 and 411104 3) Water levels dropped 0 35 within monitoring welt 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 4) Grab sample 5) Insufficient amount of water to sample well 6) Sample chromatogram does not match the standard gasoline chromatogram 1(Time OdlLockefordlTabloslSCM&Asmt This As Page 9 of 10