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TABLE i GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration(lig/L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE I RW2 12/30/93 813 2788 -1975 000 620 870 690 2,600 26,000 -- 02/17/94 2749 -1936 000 170 140 150 540 5,600 -- 05/10/94 27 17 -1904 000 230 750 410 1,100 10,000 -- 08/02/94 28 65 -2052 000 -- __ 11/01/94 2899 -2086 000 -- -- _- 02/17/95 2644 -18 31 000 220 680 460 1,400 11,000 -- 05/11/95 23 83 -1570 000 350 670 560 1,500 12,000 -- 08/24/95 25 19 -1706 000 200 420 430 1,000 12,000 -- 10/19/95 2566 -1753 000 240 360 430 1,200 9,500 <50 02/13/96 23 42 -1529 000 170 370 400 1,100 11,000 -- 04/18/96 21 10 -12 97 000 180 280 350 880 9,600 74 08/08/96 2228 -14 15 000 160 360 470 1,100 7,800 <50 11/04/96 2268 -1455 000 230 180 460 980 10,000 290 02/03/97 1822 -1009 000 170 120 270 640 6,100 240 05/08/97 676 1775 -1099 000 160 130 330 540 7,400 260 08/26/97 19 53 -1277 000 190 170 320 450 7,000 110 11/11/97 2007 -1331 000 200 170 370 610 7,200 350 03/03/98 1447 -7 71 000 92 160 300 590 6,000 260 03/03/98 <14* 05/20/98 1435 -759 000 130 140 310 560 6,600 250 05/20/98 <14* 08/19/98 15 86 -9 10 000 100 160 330 800 7,500 1,700 08/19/98 <40* 11/18/98 1620 -944 000 110 130 280 510 5,300 95 03/30/99 1430 -754 000 41 74 217 329 5,720 <20 05/05/99 1467 -7 91 000 63 4 109 263 545 5,380 68 7 08/20/99 1602 -926 000 120 56 1 236 265 4,740 251 12/06/99 16 35 -959 000 72 41 210 2299 2,500 <5 02/29/00 1376 -700 000 17 4 5 28 164 1,400 <1 05/16/00 1390 -714 000 56 14 100 304 1,700 19 0941100 1627 -9 51 000 140 34 160 1152 3,700 <5 t 1pra�ects173942hnasterlwp1g9000942yw xis Paye 25 of 37