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i <br /> 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 msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> RW2 02/03/97 8 13 1822 -1009 000 170 120 270 640 6,100 240 <br /> 05/08/97 <br /> 6 76 1775 - <br /> 10 99 000 160 130 334 540 7,400 260 <br /> 08/26/97 1953 -1277 000 190 170 320 450 7,000 110 <br /> 11/11/97 20 07 -13 31 000 200 170 370 610 7,200 350 <br /> 03/03/98 1447 -771 000 92 160 300 590 6,000 260 <br /> 03/03/98 <14* <br /> 05/20/98 1435 -759 000 130 140 310 560 6,600 250 <br /> 05/20/98 <14* <br /> 08/19/98 15 86 -910 000 100 160 330 800 7,500 1,700 <br /> 08/19/98 <40* <br /> 11/18/98 1620 -944 000 110 130 280 510 5,300 95 <br /> 03/30/99 1430 -754 000 41 74 217 329 5,720 <20 <br /> 05/05/99 1467 -7 91 000 634 109 263 545 5,380 68 7 <br /> 08/20/99 1602 -926 000 120 56 1 236 265 4,740 251 <br /> 12/06/99 163S -959 000 72 41 210 2299 2,500 <5 <br /> 02/29/00 1376 -700 000 17 4 5 28 164 1,400 <1 <br /> 05/16/00 1390 -714 000 56 14 100 304 1,700 19 <br /> 09/11/00 1627 -951 000 140 34 160 1152 3,700 <5 <br /> 12/13/00 16 13 -937 000 73 12 100 24 1 2,700 <2 5 <br /> 03/08/01 1523 -847 000 26 17 62 261 2,500 10 <br /> RW3 05/22/90 8 89 3095 -2206 000 16,000 41,000 5,500 31,000 160,000 -- <br /> 12/19/90 3302 -2368 061 Not sampled-LPH <br /> 01/30/91 33 73 -24 12 098 Not sampled-LPH <br /> 05/02/91 32 75 -2347 054 Not sampled-LPH <br /> 07/16-17191 33 72 -2449 047 Not sampled - LPH <br /> 10/15/91 3527 -25 58 1 10 Not sampled- LPH <br /> I 1projectn1739421ucasterlKp1g30113942gw xls Page 29 of 41 <br />