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Table 4 <br /> Historical Groundwater Analytical Results <br /> Results in Micrograms per Liter(ug/L or ppb) <br /> Time Oil Company-Property 04-049 <br /> 14000 East Highway 88 <br /> Lockeford California <br /> WELL DATE <br /> ID SAMPLED BENZENE TOLUENE ETHYLBENZENE XYLENES TPHg MtBE <br /> (ug/L u 1L u !L (ug/L (ug/L u 1L <br /> MW-5 07/19/96 163 07 25 14 640 <br /> 12/19/96 96 09 ND<05 15 122 --- <br /> 02126l97 78 10 1 0 28 184 <br /> 04116!97 72 ND<0 5 ND<0 5 22 157 --- <br /> 07114/97 418 420 100 898 5580 <br /> 10/13/97 138 221 284 291 2010 ND<50 <br /> 01/27/98 62 ND<05 08 36 102 ND<50 <br /> 04/28/98 388 494 928 716 4460 122 <br /> 08/13/98 488 852 207 1050 4760 ND<100 <br /> 10/26/98 430 279 211 1130 5600 ND<50 <br /> 01/27/99 139 83 640 445 2060 ND<50 <br /> 04/26/99 395 22 177 608 4050 ND<100 <br /> 07/14/99 191 41 953 572 1490 73 <br /> 11/24199 32 12 07 33 146 49 <br /> 02/17!00 ND<0 5 ND<0 5 ND<0 5 ND<0 5 88 09 <br /> 06/01/00 47 ND<0 5 ND<0 5 ND<0 5 118 66 <br /> 08/18/00 07 ND<0 5 ND<0 5 ND<1 5 ND<50 66 <br /> 11/04/00 106 91 16 10 979 22 <br /> 01/11/01 208 103 406 764 394 16 <br /> 04/27/01 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 09 <br /> 08!20101 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 <br /> 11128/01 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<0 5 <br /> 03/04102 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 05 <br /> 05116102' NS NS NS NS NS NS <br /> 07/25/02 NS NS NS NS NS NS <br /> 11/12/02 NS NS NS NS NS NS <br /> 01/16/03 ND<0 5 ND<0 5 ND<0 5 ND<0 5 ND<50 ND<0 5 <br /> 05/15/03 NS NS NS NS NS NS <br /> 07/24/03 ND<0 5 ND<0 5 ND<0 5 ND<1 0 ND<50 ND<0 5 <br /> 10120/03' NS NS NS NS NS NS <br /> 01105/04' NS NS NS NS NS NS <br /> 04101/04' NS NS NS NS NS NS <br /> 07123/047' NS NS NS NS NS NS <br /> 10104104' NS NS NS NS NS NS <br /> NOTES <br /> ug1L=micrograms per Liter <br /> ppb=parts per billion <br /> TPHg=Total Petroleum Hydrocarbons as gasoline <br /> MtBE=Methyl ter[-Butyl Ether by Method 8020 through 4126199 by 8260 thereafter <br /> ND=Not Detected at or above the reported detection limits <br /> NS=Not Sampled <br /> MCL s=Maximum Contaminant Levels for California drinking water reported by the California Department of Health Services <br /> 'Title 22 California Code of Regulations'as of September 12 2003 <br /> •=Elevated reporting levels are due to high concentration of non-target anatytes requiring sample dilution <br /> 1) Monitoring well MW-5 went dry during purge on 05/16/02 and did not recharge <br /> 2) Well was reportedly dry during gauging on 10120/03 1/5104 and 411104 <br /> 3) Water levels dropped 0 35'within monitoring well MW-10 following initial gauging of site wells The well was not sampled on 10120/03 due to <br /> an insufficient amount of water in the well <br /> 4) Grab sample <br /> 5) Insufficient amount of water to sample well <br /> 6) Sample chromatogram does not match the standard gasoline chromatogram <br /> Page 5of10 <br /> 1 STime t]dlLockefordlTatrleslSCM&Asmt This x15 <br />