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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( L) Well Elevation to Water Elevation Thickness Ethyl- Number _ Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g - MTBE RW2 12/04/01 676 1754 -1078 000 39 19 150 1133 2,800 <5* RW2 03/05/02 676 1665 -989 000 51 5 290 176 182 4,560 h 132 RW2 03/05/02 676 <0 5* RW2 06/11/02 676 1723 -1047 000 360 144 106 745 3,830 h 660 RW2 06/11/02 676 <0 5* RW2 09/10/02 676 18 37 -1161 000 60 0 240 154 950 4,380 h 103 RW2 09/10/02 676 <5* RW2 12/18/02 6 76 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 000 422 15 0 81 3 427 2,450 h 627 RW2 06/11/03 676 <0 5* RW2 09/17/03 676 19 15 -1239 000 108 24 6 179 932 3,140 h 138 RW2 09/17/03 676 <0 5* RW2 12/08/03 676 1914 -12 38 000 68 9 196 106 46 2 1,400 h 637 RW2 12/08/03 676 <0 5* RW2 03/02/04 676 1761 -1085 000 58 6 171 113 628 5,460 h 850 RW2 03/02/04 676 <0 5* I RW3 05/22/90 8 89 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 -- RW3 12/19/90 8 89 3302 -23 68 061 Not sampled-LPH RW3 01/30/91 8 89 3373 -2412 098 Not sampled-LPH RW3 05/02/91 889 3275 -2347 054 Not sampled-LPH RW3 07116-17191 8 89 33 72 -2449 047 Not sampled-LPH RW3 10/15/91 889 35 27 -25 58 1 10 Not sampled-LPH RW3 01/28/92 8 89 3269 -23 70 0 14 Not sampled- LPH RW3 04/30/92 889 3227 -2334 006 Not sampled- LPH RW3 08/13/92 8 89 3467 -2550 039 Not sampled-LPH RW3 10/08/92 889 3536 -2606 056 Not sampled-LPH RW3 02/23/93 8 89 31 34 -2245 000 4,100 4,300 1,600 8,300 47,000 -- RW3 05/18/93 889 3002 -21 13 000 19,000 22,000 3,100 17,000 90,000 -- b*rojects1739421Unasterlwp\gO30413942gw xls Page 35 of 52