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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(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW4 09/20/01 7 18 40* MW4 12/04/01 7 12 1771 -1059 000 076 <0 5 <0 5 <0 5 69 74* MW4 03/05/02 7 12 1685 -973 000 320 <0 5 <0 5 <0 5 316 h 760 MW4 03/05/02 712 112* MW4 06/11/02 7 12 1741 -1029 000 2 9 <0 5 <0 5 <0 5 424 h 778 MW4 06/11/02 712 40 6* MW4 09/10/02 7 12 1853 -1141 000 2 4 <0 5 <0 5 <0 5 324 h 850 MW4 09/10/02 7 12 94 4* MW4 12/18/02 7 12 1828 -11 16 000 1 8 <0 5 <0 5 <0 5 301 h 82 6 MW4 12/18/02 7 12 92 0* MW4 03/24/03 7 12 1780 -1068 000 <0 5 <0 5 <0 5 <0 5 402 h 723 MW4 03/24/03 712 72 5* MW4 06/11/03 7 12 1793 -1081 000 230 0 6 <0 5 <0 5 372 h 686 MW4 06/11/03 7 12 62 6* MW4 09/17/03 7 12 1927 -12 15 000 330 <0 5 <0 5 <0 5 547 h 108 MW4 09/17/03 712 114* MW4 12/08/03 7 12 1928 -1216 000 170 <0 5 <0 5 <0 5 444 h 126 MW4 12/08/03 712 130* MW4 03/02/04 712 1778 -1066 000 220 <0 5 <0 5 <0 5 354 h 100 MW4 03/02/04 7 12 84 2* MW4 06/28/04 7 12 1896 -1184 000 -- -- -- -- -- -- MW4 3 06/29/04 7 12 -- -- -- 1 20 <0 5 <0 5 <0 5 380 h 99 2* MW4 09/27/04 712 1983 -1271 000 — -- -- -- -- -- MW4 09/28/04 712 -- -- -- 190 <0 5 <0 5 <0.5 406 h 96 3* MW5 07/16/87 958 1669 -711 000 <10 480 280 1,390 2,200 -- MW5 04/11/88 958 2286 -1328 000 <2 0 25 25 85 500 -- MW5 09/13/88 958 2533 -1575 000 44 650 50 110 1,400 -- MW5 11/16/88 958 2531 -1573 000 <1 3 19 25 24 910 -- MW5 02/09/89 9 58 2509 -15 51 000 3 4 12 15 22 1,250 -- MW5 05/31/89 958 2672 -17 14 000 <0 5 14 24 46 790 -- MW5 08/17/89 958 2844 -1886 000 10 29 13 12 1,200 -- 8 1projects%739421master%wp%g090413942gw x1s Page i l of 56