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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(, g/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW2 10/19/95 8 13 25 66 -1753 000 240 360 430 1,200 9,500 <50 RW2 02/13/96 8 13 2342 -1529 000 170 370 400 1,100 11,000 -- RW2 04/18/96 8 13 21 10 -1297 000 180 280 350 880 9,600 74 RW2 08/08/96 8 13 2228 -1415 000 160 360 470 1,100 7,800 <50 RW2 11/04/96 8 13 2268 -1455 000 230 180 460 980 t0,000 290 RW2 02/03/97 8 13 1822 -1009 000 170 120 270 640 6,100 240 RW2 05/08/97 676 1775 -1099 000 160 130 330 540 7,400 260 RW2 08/26/97 676 1953 -1277 000 190 170 320 450 7,000 110 RW2 11/11/97 676 2007 -1331 000 200 t70 370 610 7,200 350 RW2 03/03/98 676 1447 -7 71 000 92 160 300 590 6,000 260 RW2 03/03/98 676 <14* RW2 05/20/98 676 1435 -759 000 130 140 310 560 6,600 250 RW2 05/20/98 676 <14* RW2 08/19/98 676 1586 -910 000 100 160 330 800 7,500 1,700 RW2 08/19/98 676 <40* RW2 11/18/98 676 1620 -944 000 110 130 280 510 5,300 95 RW2 03/30/99 676 1430 -754 000 41 74 217 329 5,720 <20 RW2 05/05/99 676 1467 -7 91 000 634 109 263 545 5,380 687 RW2 08/20/99 676 1602 -926 000 120 561 236 265 4,740 251 RW2 12/06/99 676 1635 -959 000 72 41 210 2299 2,500 <5 RW2 02/29/00 676 1376 -7 00 000 17 4 5 28 16 4 1,400 <1 RW2 05/16/00 676 1390 -7 14 000 56 14 100 304 1,700 19 RW2 09/11/00 676 1627 -951 000 140 34 160 1152 3,700 <5 RW2 12/13/00 676 16 13 -937 000 73 12 100 241 2,700 <2 5 RW2 03/08/01 676 1523 -847 000 26 17 62 26 1 2,500 10 RW2 06/21/01 676 1667 -991 000 78 9 9 43 403 3,700 24 RW2 06/21/01 676 <5* RW2 09/20/01 676 1776 -1100 000 72 46 46 697 4,600 <2 5 RW2 12/04/01 676 1754 -1078 000 39 19 150 1133 2,800 <5* RW2 03/05/02 676 1665 -9 89 000 515 29 0 176 182 4,560 h 132 RW2 03/05/02 676 <0 5* RW2 06/11/02 676 1723 -1047 000 360 14 4 106 745 3,830 h 66 0 RW2 06/11/02 676 <0 5* RW2 09/10/02 676 1837 -1161 000 600 240 154 95.0 4,380 It 103 g 1projects1739424mastcAwp\gO902\3942gw xis Page 28 of 41