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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(µg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE 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 1812 -1136 000 540 208 134 69 4 2,200 h 155 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 03/24/03 676 <0 5* RW2 06/11/03 676 1776 -1100 0 00 422 I5 0 813 427 2,450 h 627 RW2 06/11/03 676 <0 5* RW2 09/17(03 676 19 15 -1239 000 108 246 179 932 3,140 h 138 RW2 09/17/03 676 <0 5* RW2 12/08/03 676 19 14 -1238 000 689 19 6 106 462 1,400 h 637 RW2 12/08/03 676 <0 5* RW2 03/02/04 676 1761 -1085 000 586 171 113 628 5,460 h 850 RW2 03/02/04 676 <0 5* RW2 06/28/04 676 1883 -1207 000 -- -- -- -- -- -- RW2 06/29/04 676 -- -- -- 19 0 6 8 42 1 212 1,840 h 271 RW2 06/29/04 676 <0 5* RW2 09/27/04 676 1970 -1294 000 697 214 125 533 4,170 h 681 RW2 09/27/04 676 <0 5* RW2 12/01/04 676 1933 -1257 000 -- -- -- -- -- -- RW2 12/02/04 676 -- -- -- 188 8 3 365 22 1 1,530 h 25 8 RW2 12/02/04 676 <0 5* RW2 03/24/05 676 1744 -1068 0 00 103 3 0 184 8 8 894 h 7 9 RW2 03/24/05 676 <0 5* RW2 06/22/05 676 17.49 -10 73 000 -- -- -- -- _ -- RW2 06/23/05 6.76 -- -- — 151 4 0 224 86 1,190 h 16.8 RW2 06/23/05 676 <1* RW3 05/22/90 8 89 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 -- RW3 12/19/90 889 3302 -2368 061 Not sampled-LPH RW3 01/30/91 889 3373 -2412 098 Not sampled-LPH RW3 05/02/91 889 32 75 -2347 054 Not sampled-LPH g Ipmjects1739421masterlwp1gp60513942gw xls Page 38 of 59