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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(gg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE RW2 05/20/98 676 1435 -759 000 130 140 310 560 6,600 250 RW2 05/20/98 6 76 <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 -791 000 634 109 263 545 5,380 68 7 RW2 08/20/99 676 16 02 -926 000 120 56 1 236 265 4,740 251 RW2 12/06/99 676 1635 -959 000 72 41 210 2299 2,500 <5 RW2 02/29/00 676 1376 -700 000 17 4 5 28 164 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 62 261 2,500 10 RW2 06/21/01 676 1667 -991 000 78 9 9 43 403 3,700 24 RW2 06/21/01 6 76 <5* RW2 09/20/01 6 76 1776 -1100 000 72 46 46 697 4,600 <2 5 RW2 12/04/01 6 76 1754 -1078 000 39 19 150 1133 2,800 <5* RW2 03/05/02 676 1665 -989 000 515 290 176 182 4,560 h 132 RW2 03/05/02 676 <0 5* RW2 06/11/02 6 76 1723 -1047 000 360 14 4 106 745 3,830 h 660 RW2 06/11/02 676 <0 5* RW2 09/10/02 676 1837 -1161 000 600 240 154 950 4,380 h 103 RW2 09/10/02 676 <5* RW2 12/18/02 676 18 12 -1136 000 540 208 134 694 2,200 h 155 RW2 12/18/02 676 <0 5* RW2 03/24/03 676 1740 -1064 000 262 7 5 558 257 2,950 h 274 RW2 03/24/03 676 <0 5* RW2 06/11/03 676 1776 -1100 0 00 422 15 0 813 42 7 2,450 h 627 RW2 06/11/03 676 <0 5* RW2 09/17/03 676 1915 -1239 000 108 246 179 93 2 3,140 h 138 RW2 09/17/03 676 <0 5* 8 1projects1739424nasterlwp1g1204U942gw As Page 37 of 58