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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> RW2 01/28/92 8 13 3076 -2263 000 260 1,200 590 2,500 17,000 -- <br /> 04/30/92 Not accessible -- -- <br /> 08/13/92 3247 -2434 000 130 630 280 1,100 8,500 -- <br /> 10/08/92 3303 -2490 000 130 630 250 1,400 11,000 -- <br /> 02/23/93 2971 -2158 000 130 580 1,000 2,000 9,700 -- <br /> 05/18/93 2830 -2017 000 420 1,400 750 2,400 16,000 -- <br /> 08/22/93 2857 -2044 000 330 1,100 620 1,900 15,000 -- <br /> 12/30/93 27 88 -1975 000 620 870 690 2,600 26,000 -- <br /> 02/17/94 2749 -1936 000 170 140 150 540 5,600 -- <br /> 05/10/94 27 17 -1904 000 230 750 410 1,100 10,000 -- <br /> 08/02/94 28 65 -2052 000 -- _- -- -- <br /> 11/01/94 2899 -20 86 000 -- -- -- <br /> 02/17/95 2644 -18 31 000 220 680 460 1,400 11,000 -- <br /> 05/11/95 23 83 -15 70 000 350 670 560 1,500 12,000 -- <br /> 08/24/95 25 19 -1706 000 200 420 430 1,000 12,000 -- <br /> 10/19/95 2566 -17 53 000 240 360 430 1,200 9,500 <50 <br /> 02/13/96 2342 -1529 000 170 370 400 1,100 11,000 -- <br /> 04/18/96 21 10 -1297 000 180 280 350 880 9,600 74 <br /> 08/08/96 2228 -1415 000 160 360 470 1,100 7,800 <50 <br /> 11/04/96 22 68 -1455 000 230 180 460 980 10,000 290 <br /> 02/03/97 1822 -1009 000 170 120 270 640 6,100 240 <br /> 05/08/97 676 1775 -1099 000 160 130 330 540 7,400 260 <br /> 08/26/97 1953 -1277 000 190 170 320 450 7,000 110 <br /> 11/11/97 2007 -13 31 000 200 170 370 610 7,200 350 <br /> 03/03/98 1447 -7 71 000 92 160 300 590 6,000 260 <br /> 03/03/98 <14* <br /> 05/20/98 1435 -7 59 000 130 140 310 560 6,600 250 <br /> f VprojectsM9421masterlwp�gI20C)U942gw As Page 29 of43 <br />