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� � � � � � !■ice � � � >• � � � � � TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(n/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE V3 03/03/98 763 <200* V3 05/20/98 763 1864 -1101 000 88 1,200 2,900 14,000 44,000 730 V3 05/20/98 763 <100* V3 08/19/98 763 1741 -978 000 <25 410 970 4,200 13,000 <125 V3 08/19/98 763 <67* V3 11/18/98 7 63 17 It -948 000 <25 680 1,800 7,000 20,000 <125 V3 03/30/99 7 63 1595 -832 000 <25 781 2,180 8,630 37,500 <100 V3 05/05/99 7 63 15 95 -832 000 <10 389 1,040 4,500 14,400 774 V3 08/20/99 7 63 -- __ __ __ V3 12/06/99 763 V3 02/29/00 7 63 V3 05/16/00 763 -- __ __ -- V3 09/11/00 763 1760 -997 000 8 5 20 8 2 36 390 <0 5 V3 12/13/00 763 1745 -9 82 000 11 110 440 1,150 6,000 <2 5 V3 03/08/01 7 63 1670 -907 000 <25 640 2,100 8,900 40,000 <25 V3 06/21/01 7 63 1807 -1044 0 00 <0 5 3 1 20 346 1,500 30 V3 06/21/01 763 <5* V3 09/20/01 763 1925 -1162 000 9 8 18 46 132 950 <0 5 V3 12/04/01 7 61 1904 -1143 000 <50 260 960 4,200 19,000 <5* V3 03/05/02 761 1820 -1059 000 -- -- -- __ V3 03/06/02 7 61 -- -- -- 260 484 1,390 5,280 13,900 h 102 V3 03/06/02 7 61 <10* V3 06/11/02 7 61 1867 -1106 Sheen 72 0 117 548 2,000 8,300 h 100 V3 06/11/02 7 61 <2 5* V3 09/10/02 761 1998 -1237 000 <50 260 970 3,790 14,100 h 700 V3 09/10/02 761 <50* V3 12/18/02 7 61 19 71 -12 10 000 <50 380 1,310 5,260 17,000 h <50 V3 03/24/03 7 61 19 10 -1149 0 00 -- -- -- __ _ V3 03/25/03 7 61 -- -- -- 340 398 1,760 7,240 27,500 h 920 V3 03/25/03 7 61 <5* V3 06/11/03 7 61 1930 -1169 000 836 320 1,430 5,950 21,900 h 182 V3 06/11/03 7 61 <5* V3 09/17/03 7 61 2075 -13 14 000 75 0 485 2,160 8,640 31,000 h 95 0 g 1proaecls%739421mas[erlwplq 120513942gw xis Page 53 of 59