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Table 4 Historical Groundwater Analytical Results Results In Micrograms per Liter)ug/L or ppb) Time Oil Company-Property 04-049 14000 East Highway 88 Lockeford California WELL DATE ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE (ug/L jug/L)( (ug/L (ug/L (ug/L u-!L MW-8 07/19/96 58 ND<0 5 ND<0 5 10 ND<50 12/19/96 101 ND<0 5 ND<0 5 ND<0 5 102 --- 02126/97 -- 02/26/97 4 5 ND<0 5 ND<0 5 07 97 --- 04/16197 27 ND<0 5 ND<0 5 ND<0 5 ND<50 -_- 07/14/97 40 ND<0 5 ND<0 5 ND<0 5 69 10/13/97 20 ND<0 5 ND<0 5 ND<0 5 52 ND<5 0 01/27/98 12 ND<D 5 ND<0 5 05 ND<50 ND<5 0 04/28/98 27 ND<0 5 06 14 261 ND<5 0 08/13/98 13 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 10/26/98 18 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 01/27/99 10 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 04/26/99 09 ND<0 5 ND<0 5 ND<0 5 78 ND<5 0 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 02117100 ND<0 5 ND<0 5 ND<0 5 10 64 ND<0 5 06101100 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 08/18/00 ND<0 5 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<0 5 11/04/00 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 01/11/01 ND<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 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 05/16/02 ND<0 5 08 ND<0 5 10 ND<50 ND<0 5 07/25/02 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 11/12/02 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 01/16/03 NO<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 05/15/03 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 07/24/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 10/20/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 01/05/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 04101/04 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 07123104 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 10104104 N0<0 5 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<0 5 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 MCI-'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 10120103 115104 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 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 w 1%Time DMI-OCkeforMTablesZCM&Asmt Tbls As Page 8 of 10