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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 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 6 76 1776 -1100 000 422 150 813 427 2,450 h 62 7 RW2 06/11/03 676 <0 5* RW2 09/17/03 676 1915 -1239 000 108 246 179 932 3,140 h 138 RW2 09/17/03 676 <0 5* RW2 12/08/03 676 1914 -1238 000 68 9 19 6 106 462 1,400 h 63 7 RW2 12/08/03 676 <0 5* RW2 03/02/04 676 1761 -1085 000 58 6 171 113 628 5,460 h 85 0 RW2 03/02/04 676 RW2 06/28/04 676 1883 -1207 000 -- <0 5* _ _ _ RW2 06/29/04 676 - - - 19.0 6 8 421 212 1,840 h 271 RW2 06/29/04 676 <0 5* RW3 05/22/90 889 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 RW3 12/19/90 889 3302 -2368 0 61 Not sampled-LPH -- RW3 01/30/91 889 3373 -2412 098 Not sampled-LPH RW3 05/02/91 8 89 3275 -2347 0 54 Not sampled-LPH RW3 07/16-17/91 8 89 3372 -2449 047 Not sampled-LPH RW3 10/15/91 8 89 3527 -25 58 1 10 Not sampled-LPH RW3 01/28/92 889 3269 -2370 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 02/23/93 889 3134 -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 RW3 08/22/93 8 89 3060 -2171 000 18,000 22,000 2,800 16,000 110,000 -- RW3 12/30/93 889 2963 -2074 000 18,000 22,000 2,900 15,000 96,000 -- g 1projects%739421mas[er%wp1g0704\3942gw xis Page 36 of 54