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mmm mm • • i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Cioundwater LPH Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 08/20/99 854 1785 -931 000 -- -- -- -- -- -- MW3 12/06/99 854 1802 -948 0 00 - - -- -- - -- MW3 02/29/00 854 1567 -7 13 0 00 - - -- - -- MW3 05/16/00 854 1562 -7 08 000 -- -- -- -- -- -- MW3 09/11/00 854 1798 -9 44 000 73 84 5 9 11 5 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 1 8 8 3 90 <0 5 MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 MW3 06/21/01 854 1842 -988 000 <0 5 <0 5 <0 5 <0 5 160 2 9 MW3 06/21/01 854 <5* MW3 09/20/01 854 1955 -1101 000 -- -- -- -- -- -- MW3 12/04/01 8 51 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 851 1850 -999 000 260 100 050 160 290 h 760 MW3 03/05/02 8 51 <0 5* MW3 06/11/02 8 51 18 88 -1037 000 -- -- -- -- -- -- MW3 09/10/02 8 51 2020 -1169 000 1 6 2 6 1 8 5 9 246 h 6 5 MW3 09/10/02 851 <0 5* MW3 12/18/02 851 1997 -1146 000 2 8 2 1 1 6 4 7 323 h <0 5 MW3 03/24/03 8 51 1940 -1089 000 -- -- -- -- -- -- MW3 03/25/03 8 51 -- -- -- 500 1 8 4 0 5 6 755 h <0 5 MW3 06/11/03 851 1956 -11 05 000 182 6 1 14 8 U 3 1,510 h 344 MW3 06/11/03 851 <0 5* MW3 09/17/03 851 2094 -1243 000 920 6 2 124 167 1,510 h 268 MW3 09/17/03 8 51 <0 5* MW3 12/08/03 851 2094 -1243 000 570 6 1 9 0 11 1 1,270 h 163 MW3 12/08/03 8 51 <0 5* MW3 03/02/04 8 51 1945 -1094 000 680 4 4 104 9 7 940 li 224 MW3 03/02/04 851 <0 5* MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- NTW4 0411 I/88 8 13 21 23 -13 10 000 510 <25 490 1,100 8,500 -- MW4 09/13/88 8 13 2366 -15 53 0 00 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 23 81 -1568 0 00 860 340 810 1,000 8,000 MW4 02109!89 8 13 23 55 -1542 000 630 20 530 650 4,800 -- g 1proiccls1739421mastei�wp1gD30413942bnw As N64,8 of 52