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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 Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW9 07116-17191 7 88 2960 -21 72 a 000 MW9 10/15/91 788 Dry -- -- -- -- -- MW9 01/28/92 7 88 DiyMW9 04/30/92 788 2907 -21 14 000 MW9 08/13/92 7 88 2947 -2159 000 - MW9 10/08/92 7 88 Dry MW9 02/23/93 788 2836 -2048 000 MW9 05/18/93 788 -- __ MW9 08/22/93 788 Not accessible MW9 12/30/93 788 Not accessible MW9 02/17/94 7 88 Not accessible -- -- MW9 05/10/94 788 26 15 -1827 000 3,100 29 52 89 7,400 MW9 08/02/94 7 88 2765 -1977 0 00 4,900 230 120 490 13,000 MW9 11101/94 7 88 2797 -20 09 000 4,300 270 170 700 12,000 MW9 02/17/95 7 88 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 08/24/95 788 2439 -1651 000 490 6 0 38 110 1,200 -- MW9 10!19/95 7 88 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 7 88 2035 -1247 0 00 780 220 110 460 5,700 <125 MW9 08/08/96 7 88 21 56 -1368 000 510 <10 88 260 2,700 230 MW9 11/04/96 7 88 21 94 -14 06 000 370 <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 6 57 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 6 57 68* MW9 05/20/98 657 1386 -729 000 3 5 <0 5 <0 5 <0 5 220e 22 MW9 05/20/98 6 57 20* MW9 08/19/98 657 1550 -8 93 000 0 81 68 <0 5 <0 5 340 45 g%prolect,173942Vmas(Lrlwl)%gD30313942p xIs Page 17 of 47