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TABLE 2 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casmg Depth Groundwater LPH Concentration(µglL) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene .Xylenes TPH-g MTBE MW4 07/16/87 813 1815 -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 -1553 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 2381 -1568 000 860 340 810 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 12/19/89 813 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 2897 -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 Dry MW4 10/08/92 813 Diy MW4 02/23/93 8 13 29 12 -2099 000 MW4 05/18/93 813 -- -- -_ MW4 08/22/93 8 13 2804 -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 -2085 000 MW4 02/17/95 8 13 2641 -1828 000 64 <0 5 32 34 880 -- MW4 05/11/95 8 13 2384 -1571 000 9 1 <1 0 87 29 520 -- MW4 08/24/95 8 13 2522 -1709 000 28 20 35 72 870 -- MW4 10/19/95 8 13 2570 -1757 000 19 <5 0 18 60 1,000 <25 MW4 02/13/96 8 13 2348 -1535 000 44 <1 0 12 1 1 750 -- MW4 04/18/96 8 13 21 17 -1304 000 10 <10 12 10 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 44 <0 5 52 <0 50 450 74 MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 53 <0 5 730 15 MW4 02/03/97 8 13 1832 -1019 000 93 <2 0 11 35 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 083 35 <0 5 780 10 MW4 08/26/97 7 18 1971 -1253 000 76 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 1projc",\73942kmahterk%k p%gO9OM9 i2gw xla Page 8 of 47