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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 OWL) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW9 11/16/88 788 2324 -1536 000 70 12 14 19 2,200 MW9 02/09/89 788 2279 -1491 000 12 16 41 34 800 MW9 05/31/89 788 2447 -1659 000 14 <0 5 1 2 13 540 MW9 08/17/89 788 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- MW9 12/19/89 788 2697 -1909 000 66 1 1 <0 5 12 470 MW9 03/21/90 788 2745 -1957 000 84 10 2 1 37 160 -- MW9 05/17/90 788 2823 -2035 000 20 093 089 <0 5 120 MW9 09/25/90 788 Dry -_ -- -- MW9 12/19/90 788 2933 -2145 000 -- MW9 01/30/91 788 Dry -- MW9 05/02/91 788 2945 -2157 000 -- - -- - MW9 07/16-17/91 788 2960 -21 72 a 000 -- MW9 10/15/91 788 Dry -- MW9 01/28/92 788 Dry -- MW9 04/30/92 799 2907 -21 19 000 MW9 08/13/92 788 2947 -21 59 000 -- MW9 10/08/92 788 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 02/17/94 788 Not accessible __ -_ 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 05111/95 788 2396 -1608 000 2,500 68 Ito 490 8,300 MW9 08/24/95 788 2439 -1651 000 490 60 38 110 1,200 MW9 10/19/95 7 88 2485 -1697 000 840 120 100 320 4,900 79 MW9 02/13/96 788 2255 -1467 000 890 <10 110 220 4,400 MW9 04/18/96 798 2035 -1247 000 780 220 110 460 5,700 <125 MW9 08/08/96 788 2156 -1368 000 510 <10 88 260 2,700 230 MW9 11/04/96 7 88 21 94 -1406 000 370 <10 24 26 1,700 160 MW9 02/03/97 788 1751 -963 000 320 16 56 160 1,600 230 g Iprojectsti739421msteAwp1gO9O2U942gw xls Page 15 of 41