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i � i i >• i I• i i � i i � � � � 1• .� � • 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 RW4 08/08/96 923 2491 -15 68 000 730 2,500 970 2,900 15,000 <125 RW4 11/04/96 923 2528 -1605 000 1,600 5,200 1,300 4,900 36,000 <250 RW4 02/03/97 923 21 40 -12 17 000 1,700 6,500 1,900 7,200 42,000 1,300 RW4 05/08/97 786 2005 -12 19 000 540 1,500 720 2,200 16,000 56 RW4 08/26/97 7 86 2151 -13 65 000 98 180 140 340 2,600 56 RW4 11/11/97 7 86 22 12 -1426 000 260 350 320 570 4,100 98 RW4 03/03/98 7 86 1685 -899 000 1,500 4,600 2,100 6,000 38,000 1,100 RW4 03/03/98 7 86 <67* RW4 05/20/98 7 86 16 11 -825 5 0 00 450 460 600 890 7,400 400 RW4 05/20/98 7 86 <6 7* RW4 08/19/98 786 17 51 -965 000 130 240 210 580 3,100 90 RW4 08/19/98 7 86 <12* RW4 11/18/98 7 86 1798 -1012 000 300 480 400 970 5,600 <25 RW4 03/30/99 786 -- -- RW4 05/05/99 786 RW4 08/20/99 7 86 -- RW4 12/06/99 7 86 -- RW4 02/29/00 7 86 -- _- -- RW4 05/16/00 7 86 1520 -734 000 5 6 57 220 363 2,500 21 RW4 09/11/00 786 1795 -1009 000 5 7 5 8 1 7 7 7 550 <0 5 RW4 12/13/00 7 86 1785 -999 000 5 6 088 1 7 4 4 820 <0 5 RW4 03/08/01 7 86 17 10 -924 000 <0 5 1 1 3 5 13 9 640 5 5 RW4 06/21/01 786 1833 -1047 000 3 6 0 81 13 251 350 64 RW4 06/21/01 786 <5* RW4 09/20/01 7 86 1958 -11 72 0 00 <2 5 <2 5 <2 5 <2 5 270 <2 5 RW4 12/04/01 7 86 1947 -1161 000 190 76 320 349 2,600 <5* RW4 03/05/02 7 86 1865 -1079 000 -- __ _- RW4 03/06/02 7 86 -- 198 740 316 304 2,350 h 200 RW4 03/06/02 786 -- <0 5* RW4 06/11/02 7 86 19 13 -1127 000 108 470 230 246 21520 h 190 RW4 06/11/02 7 86 <0 5* RW4 09/10/02 7 86 2038 -12 52 000 599 186 1,240 802 14,800 h 134 g kprojeus173942Vuiasterlwp`g0303U942gw A Page 34 of47