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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 WELLDATE ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE u !L (ug/ILL( (ug/L (ug/L u !L u !L MW-6 07!19196 143 292 810 495 1370 - 12/19/96 455 452 75 124 515 --- OV26197 930 137 234 297 1510 --- 04116197 --04/18/97 12 6 28 ND<0 5 61 88 = 07/14/97 356 20 39 31 250 10/13/97 26 34 29 461 247 ND<5 0 01/27/98 188 ND<0 5 20 192 166 ND<5 0 04/28/98 798 70 63 146 762 ND<20 08113!98 205 1 5 35 321 328 ND<5 0 10126!98 246 1 9 76 555 310 ND<5 0 01/27/99 48 ND<5 0 1 1 72 68 ND<5 0 04126!99 52 ND<0 5 08 53 73 ND<5 0 07!14199 60 ND<0 5 21 15 94 11 11/24/99 05 ND<0 5 10 ND<O 5 ND<50 06 02/17/00 ND<0 5 ND<O 5 ND<O 5 12 62 ND<0 5 06/01/00 ND<0 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<O 5 08/18/00 ND<0 5 ND<0 5 05 ND05 N0<50 11 11/04/00 ND<O 5 ND<0 5 ND<0 5 ND<1 0 ND<50 05 01/11/01 ND<O 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 04/27/01 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<0 5 08120!01 ND<0 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<O 5 ND<O 5 ND<1 0 ND<O 5 03104!02 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 lie 05116!02 ND<0 5 ND<0 5 ND<0 5 N13<10 ND<50 ND<O 5 07!25!02 ND<O 5 ND<0 5 05 08 ND<50 ND<0 5 11!12102 ND<0 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<O 5 01/16/03 ND<O 5 ND<0 5 ND<0 5 ND<O 5 ND<50 ND<O 5 05/15/03 ND<O 5 ND<O 5 ND<0 5 ND<O 5 ND<50 ND<O 5 07/24/03 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<O 5 10/20/03 ND<0 5 ND<0 5 ND<O 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<O 5 04!01!04 ND<O 5 NO<O 5 ND<0 5 ND<1 0 ND<50 ND<O 5 07!23104 06 ND<0 5 ND<O 5 ND<1 0 ND<50 ND<0 5 10/04/04 ND<O 5 NQ<0 5 ND<0 5 ND<1 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 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 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 OiIlLockefordlTables55CM&Asmf This As Page 6 of 10