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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( ) Well Elevation to Water Elevation Thickness Ethyl- Number_ Date _ (feet) (feet) (feet) (feet) Benzene -Toluene benzene _- Xylenes TPH-g -- MTBE NIW9 05/31/89 788 2447 -1659 000 14 <0 5 12 1 3 540 -- MW9 08/17/89 788 2605 -1817 000 5 <0 5 2 <0 5 <250 -- MM19 12/19/89 788 2697 -1909 000 66 t 1 <0 5 12 470 MW9 03/21/90 788 2745 -1957 000 84 10 2 1 3 7 160 NIW9 05/17/90 788 28 23 -2035 0 00 2 0 093 089 <0 5 120 -- A9W9 09/25/90 788 Dry __ __ __ __ __ MW9 12/19/90 788 2933 -2145 000 NINV9 01/30/91 7 88 Dry MW9 05/02/91 7 88 2945 -2157 000 MW9 07116-17/91 7 88 2960 -21 72 a 000 NIW9 10/15/91 788 Dry MW9 01/28/92 788 Dry MW9 04/30/92 7 88 2907 -21 19 000 MW9 08/13/92 788 2947 -2159 000 MW9 10/08/92 7 88 Dry MW9 02/23/93 788 2836 -2048 000 KIW9 05/18/93 7 88 -- -- -- MW9 08/22/93 7 88 Not accessible MW9 12/30/93 7 88 Not accessible NIW9 02/17/94 788 Not accessible -- -- -- __ MW9 05/10/94 7 88 26 15 -1827 000 3,100 29 52 89 7,400 -- NIM19 08/02/94 788 2765 -1977 000 4,900 230 120 490 13,000 -- MW9 11/01/94 7 88 2797 -2009 000 4,300 270 170 700 12,000 -- NIW9 02/17/95 788 2538 -17 50 000 2,200 89 100 410 7,100 -- NIW9 05/11/95 7 88 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 2485 -1697 000 840 120 100 320 4,900 79 N1 W9 02/13/96 7 88 22 55 -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 NIW9 11/04/96 788 2194 -1406 000 370 <10 24 26 1,700 160 NI W9 02/03/97 788 1751 -963 000 320 16 56 160 1,600 230 g lprojects1739421masterluplg120313942gw xis Page 18 of 51