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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 (,tg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE 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 <12 <12 <1 2 750 c 170 MW9 11/11/97 657 180* MW9 03/03/98 657 1381 -724 000 22 <0 5 15 2 0 540 60 MW9 03/03/98 657 68* MW9 05/20/98 657 1386 -729 000 3 5 <0 5 <0 5 <0 5 220e 22 MW9 05/20/98 657 20* MW9 08/19/98 6 57 1550 -893 000 081 6 8 <0 5 <0 5 340 45 MW9 08/19/98 6 57 44* MW9 11/18/98 657 1573 -9 16 000 <0 5 <0 5 <0 5 <0 5 310c 18 MW9 03/30/99 657 13 85 -728 000 -- -- -- __ __ MW9 05/05/99 657 14 23 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 MW9 08/20/99 657 15 69 -912 000 -- -- _- -- __ MW9 12/06/99 6 57 1583 -926 000 -- -- -- -- -- MW9 02/29/00 6 57 1333 -676 000 <1 <1 <1 <1 <50 48 MW9 05/16/00 6 57 1339 -682 000 -- -- __ __ 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 MW9 06/21/01 6 57 1614 -957 000 <0 5 <0 5 <0 5 <0 5 110 17 MW9 06/21/01 657 19* MW9 09/20/01 657 17 17 -1060 000 -- -- __ __ MW9 12/04/01 652 1685 -1033 000 MW9 03/05/02 652 1600 -948 000 -- __ _- -- _- MW9 03/06/02 652 -- -- -- <0 5 <0 5 <0 5 <0 5 101 h 102 MW9 03/06/02 652 150* MW9 06/11/02 652 -- -- __ -- -_ -- MW9 09/10/02 652 1772 -1120 000 -- -- _- _- MW 10 04/11/88 861 23 18 -14 57 000 640 130 170 140 3,100 MW 10 09/13/88 861 2595 -17 24 000 4,800 130 340 240 7,700 -- MW 10 l 1116188 861 2608 -1747 000 5,800 290 700 340 9,400 -- MW 10 02/09/89 8 61 2570 -1709 000 7,500 450 220 320 8,800 -- g 1pr0ieus1739421masier\wp1gp90213942gw xis Page 16 of 41