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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 EthyI- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE MW9 05/10/94 788 26 15 -1827 000 3,100 29 52 89 7,400 -- MW9 08/02/94 788 2765 -1977 000 4,900 230 120 490 13,000 -- MW9 11/01/94 788 2797 -2009 000 4,300 270 170 700 12,000 -- MW9 02/17/95 788 2538 -1750 000 2,200 89 100 410 7,100 -- MW9 05/11/95 788 2396 -1608 000 2,500 68 110 490 8,300 -- MW9 08/24/95 7 88 2439 -1651 000 490 6 0 38 110 1,200 -- MW9 10/19/95 788 24 85 -1697 000 840 120 100 320 4,900 79 MW9 02/13/96 788 2255 -1467 000 890 <10 110 220 4,400 -- MW9 04/18/96 788 2035 -1247 000 780 220 110 460 5,700 <125 MW9 08/08/96 7 88 2156 -1368 000 510 <10 88 260 2,700 230 MW9 11/04/96 7 88 2194 -1406 000 370 <10 24 26 1,700 160 MW9 02/03/97 7 88 1751 -963 000 320 16 56 160 1,600 230 MW9 05/08/97 657 1725 -1068 000 310 <5 0 39 57 2,600 250 MW9 08/26/97 657 1905 -1248 000 64 <2 0 <2 0 <2 0 1,100 150 MW9 11/11/97 657 1947 -1290 000 31 <1 2 <1 2 <1 2 750 c 170 MW9 11/11/97 657 180* MW9 03/03/98 657 13 81 -724 000 22 <0 5 1 5 2 0 540 60 MW9 03/03/98 657 68* MW9 05/20/98 657 1386 -729 0 00 3 5 <0 5 <0 5 <0 5 220e 22 MW9 05/20/98 657 20* MW9 08/19/98 657 1550 -993 000 081 6 8 <0 5 <0 5 340 45 MW9 08/19/98 657 44* MW9 11/18/98 657 1573 -916 000 <05 <05 <05 <05 310c 18 MW9 03/30/99 657 13 85 -728 000 -- -- -- -- -- MW9 05/05/99 657 1423 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 MW9 08/20/99 657 1569 -912 000 -- -- -- -- MW9 12/06/99 6 57 1583 -926 000 -- -- -- -- -- MW9 02/29/00 657 1333 -676 000 <1 <1 <1 <1 <50 4 8 MW9 05/16/00 657 1339 -6 82 000 -- -- -- -- -- MW9 09/11/00 657 -- -- -- -- -- -- -- -- -- MW9 12/13/00 657 -- -- -- -- -- -- -- MW9 03/08/01 657 1472 -8 15 000 <0 5 <0 5 <0 5 <0 5 <50 7 6 g Iprojecfs1739421masterlwplg0904\3942gw x1s Page 20 of 56