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Table 4 Historical Groundwater Analytical Results Results in Micrograms per Liter(uglL 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 u IL (ug/L u IL u1L u 1L MW-3 01/19/95 18 48 13 70 430 05/24/95 13 23 13 29 250 --- 10104195 -- 10/04/95 560 1400 360 1900 8000 --- 12J19195 --12!19195 140 180 78 260 1800 --- 02/28/96 390 110 170 200 2400 05/23/96 137 115 193 222 795 07/19/96 288 242 133 280 2700 --- 12119/96 -- 12/19/96 522 184 191 349 3510 02/26/97 136 374 700 543 2090 04/16/97 246 ND<5 0 ND<5 0 132 2640 07/14/97 364 280 94 329 2970 --- 10/13197 -- 10/13/97 246 72 107 133 2820 ND<200 01/27/98 235 07 351 245 935 93 04/28/98 411 998 103 446 3110 ND<100 08/13/98 113 256 456 604 572 ND<20 10/26198 126 170 746 778 838 ND<20 01127199 455 17 139 184 309 ND<5 0 04126/99 283 117 101 265 306 ND<5 0 07/14/99 343 ND<O 5 87 27 177 11 11/24/99 553 606 322 147 1010 ND<5 0 02/17/00 144 656 51 82 1150 14 06/01/00 905 98 405 718 458 1 3 1 08/18/00 742 1 4 6 40 384 23 11/04/00 ND<0 S ND<0 5 ND<0 5 ND<1 0 ND<50 09 01/11/01 49 06 06 23 ND<50 08 04127/01 ND<O 5 ND<O 5 ND<0 5 ND<1 0 ND<50 ND<O 5 1 08/20/01 ND<O 5 ND<O 5 ND<0 5 ND<1 0 ND<50 ND<O 5 11/28/01 ND<O 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 05 ND<0 5 ND<1 0 ND<50 ND<0 5 1 07/25/02 ND<0 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<O 5 11/12/02 ND<O 5 ND<0 5 ND<O 5 ND<O 5 ND<50 ND<0 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<0 5 ND<O 5 ND<0 5 ND<O 5 ND<50 05 ' 07/24103 ND<0 5 ND<O 5 ND<0 5 ND<1 0 ND<50 ND<O 5 10120/03 ND<O 5 ND<O 5 ND<O 5 ND<1 0 ND<50 ND<O 5 01/05/04 ND<O 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 04/01/04 ND<O 5 ND<0 5 ND<O 5 ND<1 0 ND<50 05 07/23/04 06 ND<0 5 ND<0 S ND<1 0 ND<50 ND<O 5 10/04/04 ND<0 5 ND<0 5 ND<0 5 ND<1 5 ND<50 ND<O 5 NOTES ug/L.=micrograms per Liter ppb=parts per billion TPHg=Total Petroleum Hydrocarbons as gasoline MtBE=Methyl tort-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 Calrfomia 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) Momtonng well MW 5 went dry during purge on 05/16/02 and did not recharge 2) Well was reportedly dry during gauging on 10120/03 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 ' I(Time OillLockefordSTableslSCM&Asmt This As Page 3 o 1`10