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i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration (ug/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE RW2 08/26/97 171 1111 -1217 000 190 170 320 450 7,000 110 RW2 11/11/97 676 20 07 -1331 000 200 170 370 610 7,200 350 RW2 03/03/98 676 1447 -771 000 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 -9 10 000 100 160 330 800 7,500 1,700 RW2 08/19/98 676 <40* RW2 11/18/98 676 16 20 -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 63 4 109 263 545 5,380 697 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 -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 -9 51 000 140 34 160 1152 3,700 <5 RW2 12/13/00 676 16 13 -937 000 73 12 100 24 1 2,700 <2 5 RW2 03/08/01 676 15 23 -847 000 26 17 62 261 2,500 10 RW2 06/21/01 676 1667 -9 91 000 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 6 76 17 23 -1047 000 360 14 4 106 745 3,830 h 660 RW2 06/11/02 676 <0 5* RW2 09/10/02 676 1837 -11 61 000 600 240 154 950 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 15 5 RW2 12/18/02 676 <0 5* RW2 03/24/03 676 1740 -1064 000 262 7 5 55 8 257 2,950 h 274 RW2 03/24103 676 <0 5* RW2 06/11/03 676 1776 -1100 000 422 15 0 813 427 2,450 h 627 RW2 06/11/03 676 <0 5* g 1pru3Liis173942%iiiastcrlu p\q(K)0313942gu als Page 3l of 47 I