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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHfNG AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene XXlenes TPH-g MTBE V3 09/11/00 763 1760 -9 97 000 85 20 82 36 390 <0 5 V3 12/13/00 763 1745 -982 000 11 110 440 1,150 6,000 <2 5 V3 03/08/01 763 1670 -907 000 <25 640 2,100 8,900 40,000 <25 V3 06/21/01 7 63 1807 -1044 000 <0 5 3 1 20 346 1,500 30 V3 06/21/01 763 <5* V3 09/20/01 763 1925 -1162 0 00 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 03/06/02 761 -- -- -- 260 484 1,390 5,280 13,900 h 102 V3 03/06/02 7 61 <10* V3 06/11/02 761 1867 -1106 Sheen 720 117 548 2,000 8,300 h 100 V3 06/11/02 761 <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 1971 -12 10 000 <50 380 1,310 5,260 17,000 h <50 V3 03/24/03 7 61 19 10 -1149 000 -- -- -- -- -- -- V3 03/25/03 7 61 -- -- -- 340 398 1,760 7,240 27,500 h 920 V3 03/25/03 761 <5* V3 06/11/03 761 1930 -1169 000 83 6 320 1,430 5,950 21,900 h 182 V3 06/11/03 761 <5* V3 09/17/03 761 2075 -13 14 000 75 0 485 2,160 8,640 31,000 h 950 V3 09/17/03 7 61 <5* V3 12/08/03 7 61 2072 -13 11 000 102 675 3,220 11,700 47,200 h 127 V3 12/08/03 7 61 <0 5* V3 03/02/04 7 61 1923 -1162 000 240 765 3,600 12,100 48,600 h 950 V3 03/02/04 761 <25* V3 06/28/04 7 61 2045 -1284 000 956 460 2,670 10,300 40,400 h 13 9 V3 06/28/04 7 61 <0 5* V3 09/08/04 7 61 - -- -- 163 373 1,980 6,530 28,400 h 115 V3 09/08/04 761 <2 5* V3 09/08/04 7.61 - -- - 228 531 1,980 8,170 39,000 h 142 V3 09108/04 761 <2 5* g tipro)ects173942\tnasteewplgP9Q413942gw xis Page 52 of 56