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Table 4 Historical Groundwater Analytical Results Results in Micrograms per Liter(uglL or ppb) Time Od Company Property04-049 14000 East Highway 88 Lockeford California WELL DATE ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE (ug/L (ug/L (ug/L (ug/L (ug/L u 1L MW-7 07119/96 ND<O 5 ND<0 5 ND<0 5 ND<O 5 ND<50 12/19/96 ND<0 5 ND<O 5 ND<0 5 ND<O 5 ND<50 --- OV26I97 ND<0 5 19 07 27 64 04/16/97 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 07114!97 ND<O 5 ND<O 5 ND<O 5 ND<O 5 ND<50 10/13/97 ND<O 5 ND<0 5 ND<O 5 ND<O 5 73 ND<50 01/27/98 ND<O 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<5 0 04/28/98 ND<O 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<50 08/13/98 ND<0 5 ND<0 5 ND<O 5 07 ND<50 ND<50 10/26/98 ND<0 5 ND<0 5 ND<O 5 ND<0 5 ND<50 ND<50 01/27/99 ND<O 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<5 0 04/26/99 ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<50 07/14/99 ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<O 5 11/24/99 05 ND<O 5 ND<0 5 ND<O 5 ND<50 ND<0,9 02/17/00 ND<O 5 07 ND<O 5 10 ND<50 ND<O 5 06/01/00 ND<0 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<O 5 08/18/00 ND<O 5 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<O 5 11/04/00 ND<O 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<O 5 ND<1 0 ND<50 ND<O 5 04/27/01 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<0 5 08/20/01 ND<O 5 ND<O 5 ND<O 5 ND<1 0 ND<50 ND<0 5 11/28/01 ND<0 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<0 5 • 03/04/02 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<O 5 05/16/02 ND<0 5 ND<0 5 ND<O 5 ND<1 0 ND<50 06 07/25/02 ND<0 5 ND<0 5 ND<O 5 ND<0 5 ND<50 18 11/12/02 ND<O 5 ND<0 5 ND<O 5 ND<0 5 ND<50 ND<O 5 01116/03 ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<O 5 05/15/03 ND<O 5 ND<O 5 ND<O 5 ND<0 5 ND<50 ND<O 5 07/24/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<O 5 10/20/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 01/05104 ND<O 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<O 5 04/01104 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<0 5 07/23/04 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<O 5 10/04/04 ND<O 5 ND<O 5 ND<O 5 ND<l 5 ND<50 ND<O 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 4/26199 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 05116102 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 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 ' 11Time oiIlLoCkefordlTableslSCM&Asmt Tbls xis Page 7 of 10