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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 RWI 05/20/98 770 1530 -760 000 310 1,500 670 1,800 13,000 760 RWI 05/20/98 770 <33* RWI 08/19/98 7 70 1675 -905 000 340 1,200 630 1,700 18,000 1,100 RWI 08/19/98 7 70 <40* RWI 11/18/98 7 70 1721 -951 0 00 250 840 520 1,100 8,200 90 RWI 03/30/99 770 1531 -761 000 197 678 432 967 8,150 <20 RWI 05/05/99 770 1566 -796 000 234 833 499 1,270 8,680 584 ! RWI 08/20/99 770 1731 -961 000 234 415 409 728 6,450 315 ! RWI 12/06/99 770 1742 -9 72 000 180 220 310 500 4,300 <5 RWI 02/29/00 770 1505 -735 000 280 200 750 1,270 14,000 <1 RWI 05/16/00 770 1488 -7 18 000 280 190 670 1,010 10,000 15 RWI 09/11/00 770 1725 -955 000 300 240 550 950 9,400 <5 RWI 12/13/00 770 17 17 -947 000 330 470 1,400 3,210 29,000 <120 RW 1 03/08/01 770 1635 -865 000 53 14 120 128 2,300 <0 5 RWI 06/21/01 770 1770 -10 00 0 00 130 300 530 1,450 17,000 24 RWI 06/21/01 770 <5* RWI 09/20/01 770 1886 -11 15 001 -- -- __ -- RWI, -RW1 12/04/01 768 18 64 -1096 000 -- -- __ -- -- RWI 03/05/02 768 1780 -1012 000 148 82 0 214 298 3,360 h 97 0 RWI 03/05/02 768 <0 5* RWI 06/11/02 768 1828 -1060 000 755 250 120 950 1,640 h 23 5 RWI 06/11/02 7 68 <0 5* RWI 09/10/02 768 1950 -11 82 000 634 313 121 116 2,750 h 295 RWI 09/10/02 7 68 <0 5* RWI 12/18/02 7 68 1927 -1159 000 130 910 228 255 2,400 h 240 RWI 12/18/02 768 <5* RWI 03/24/03 768 1875 -1107 000 -- -- -- -- RWI 03/25/03 768 -- -- -- 105 698 163 229 3,690 h 208 RWI 03/25/03 768 <0 5* RWI 06/11/03 768 18 87 -11 19 000 180 115 187 251 4,740 h 706 RWI 06/11/03 768 <0 5* RWI 09/17/03 7 68 2026 -1258 000 176 127 298 590 5,300 h 696 g NproaeMt 739421niaster%wp1g0704U942gw xis Page 33 of 54