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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCK-TON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration (E /g L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet ms]) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW4 07/16/87 8 13 1815 -1002 000 1,100 <50 850 1,750 4,900 -- <br /> 04/11/88 8 13 2123 -1310 000 510 <25 490 1,100 8,500 -- <br /> 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 -- <br /> 11/16/88 8 13 23 81 -1568 000 860 340 810 1,000 8,000 -- <br /> 02/09/89 8 13 23 55 -1542 000 630 20 530 650 4,800 -- <br /> 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -- <br /> 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- <br /> 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- <br /> 03/21/90 8 13 2806 -1993 000 400 68 340 160 3,200 -- <br /> 05/17/90 8 13 28 87 -20 74 000 300 40 150 93 3,500 -- <br /> 01/28/92 813 Dry __ _- __ -- -- <br /> 04/30/92 8 13 2953 -2140 000 <br /> 08/13/92 8 13 Dry <br /> 10/08/92 813 Dry <br /> 02/23/93 8 13 2912 -2099 000 <br /> 05/18/93 813 -- -- -- <br /> 08/22/93 8 13 28 04 -1991 000 <br /> 12/30/93 8 13 2785 -1972 000 <br /> 02/17/94 8 13 2749 -1936 000 <br /> 05/10/94 8 13 27 17 -1904 000 -- -- -- -- -- __ <br /> 08/02/94 8 13 2863 -2050 000 <br /> 11/01/94 8 13 2898 -20 85 000 -- -- -- -- <br /> 02/17/95 8 13 2641 -1828 000 64 <0 5 3 2 3 4 880 -- <br /> 05/11/95 8 13 23 84 -15 71 000 9 1 <1 0 8 7 2 9 520 -- <br /> 08/24/95 8 13 2522 -1709 000 28 20 35 7 2 870 -- <br /> 10/19/95 8 13 2570 -1757 000 19 <5 0 18 6 0 1,000 <25 <br /> 02113/96 8 13 2348 -15 35 000 44 <1 0 12 1 1 750 -- <br /> g tiprojecis173942�nastenwpNgW I1 3942gw xls Page 8 of 46 <br />