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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(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Numbei Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 813 2123 -1310 000 510 <25 490 1,100 8,500 MW4 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 23 81 -1568 0 00 860 340 810 1,000 8,000 MW4 02/09/89 8 13 2355 -1542 000 630 20 530 650 4,800 -- MW4 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -- MW4 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 MW4 03/21/90 8 13 2806 -1993 000 400 68 340 160 3,200 -- MW4 05/17/90 8 13 28 87 -2074 000 300 40 150 93 3,500 -- MW4 01/28/92 813 Dry MW4 04/30/92 8 13 2953 -2140 000 MW4 08/13/92 813 DIy - MW4 10/08/92 813 Dry MW4 02/23/93 8 13 29 12 -2099 000 -- MW4 05/18/93 813 -- MW4 08/22/93 8 13 28 04 -1991 000 MW4 12/30/93 8 13 2785 -1972 000 MW4 02/17/94 8 13 2749 -1936 000 MW4 05/10/94 8 13 27 17 -1904 000 MW4 08/02/94 8 13 2863 -2050 000 MW4 11/01/94 8 13 2898 -20 85 000 MW4 02/17/95 8 13 2641 -18 28 000 6 4 <0 5 3 2 3 4 880 MW4 05/11/95 8 13 2384 -1571 000 9 1 <1 0 8 7 2 9 520 MW4 08/24/95 8 13 2522 -1709 000 28 20 35 7 2 870 MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -1535 0 00 4 4 <1 0 12 1 1 750 MW4 04/18/96 8 13 21 17 -13 04 0 00 10 <1 0 12 1 0 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 5 2 <0 50 450 7 4 MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 MW4 02/03/97 8 13 18 32 -10 19 000 9 3 <2 0 11 3 5 1,400 17 g%projects\73942\master/"p\g43U\3942gw a1s Page 8 or47