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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942, 4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( /L <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW3 05/20/98 854 <2 0* <br /> 08/19/98 1748 -894 000 5 9 2 2 <0 5 0 63 280 2 6 <br /> 08/19/98 <2 0* <br /> 11/18/98 17 93 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/05/99 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 1785 -931 000 <br /> 12/06/99 1802 -948 000 <br /> 02/29/00 15 67 -713 000 <br /> 05/16/00 1562 -708 000 <br /> 09/11/00 1798 -944 000 73 84 5 9 11 5 220 <0 5 <br /> 12/13/00 1760 -906 000 3 4 11 1 8 8 3 90 <0 5 <br /> 03/08/01 17.06 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 <br /> MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- <br /> 04/11/88 2123 -13 10 000 510 <25 490 1,100 8,500 -- <br /> 09/13/88 23 66 -1553 000 860 40 670 2,400 5,600 -- <br /> 11/16/88 23 81 -15 68 000 860 340 810 1,000 8,000 -- <br /> 02/09/89 2355 -1542 000 630 20 530 650 4,800 -- <br /> 05/31/89 2501 -16 88 000 790 35 720 1,300 6,000 -- <br /> 08/17/89 2650 -1837 000 1,000 45 940 1,100 8,100 -- <br /> 12/19/89 2757 -1944 000 190 2,800 1,100 380 7,900 -- <br /> 03/21/90 2806 -1993 000 400 6 8 340 160 3,200 -- <br /> 05/17/90 2887 -20 74 000 300 40 150 93 3,500 -- <br /> 01/28/92 Dry -- -- -- -- -- -- <br /> 04/30/92 2953 -2140 000 -- -- -- -- -- <br /> 08/13/92 Dry <br /> 10/08/92 Dry <br /> npru3em\73942Uoas(t,nwp\g3OI13942gw x1s <br /> Page 7 oS'41 <br />