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• i ! <br /> 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 ms]) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW7 11/18/98 6 85 15 82 -897 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 05/05/99 1433 -748 000 <0 5 <0 5 <0 5 0 637 542 <2 0 <br /> 08/20/99 15 75 -8 90 000 -- -- -- __ -- -- <br /> 12/06/99 15 97 -912 000 <1 <1 <1 <1 92 <1 <br /> 02/29/00 1351 -666 000 1 6 <1 <1 <1 64 <1 <br /> 05/16/00 13 65 -680 000 <1 <1 <1 <1 <50 <1 <br /> 09/11/00 1592 -907 000 <0 5 <0 5 <0 5 <0 5 53 <0 5 <br /> 12/13/00 15 83 -8 98 000 076 2 8 063 309 <50 <0 5 <br /> 03/08/01 1497 -8.12 0.00 <0.5 <0 5 <0 5 <0.5 <50 <0 5 <br /> MW8 04/11/88 778 2025 -1247 000 740 18,000 5,700 32,000 120,000 -- <br /> 09/13/88 22 58 -14 80 000 470 11,000 3,900 20,000 56,000 -- <br /> 11/16/88 2272 -14 94 000 <500 9,300 3,600 16,000 63,000 -- <br /> 02/09/89 2228 -1450 000 650 13,000 3,900 21,000 62,500 -- <br /> 05/31/89 23 95 -16 17 000 460 8,700 3,700 24,000 66,000 -- <br /> 08/17/89 2549 -1771 000 620 10,000 5,500 25,000 72,000 -- <br /> 12/19/89 2660 -1882 000 190 2,800 1,100 5,300 21,000 -- <br /> 03/21/90 27 11 -1933 000 880 11,000 4,400 22,000 63,000 -- <br /> 05/17/90 2787 -2009 000 520 5,500 3,900 20,000 67,000 -- <br /> 09/25/90 29 17 -2139 000 -- -- -- -- _- <br /> I2/19/90 29 13 -2135 000 <br /> 01/30/91 Dry -- -- -- -- __ <br /> 05/02/91 2939 -2161 000 830 5,900 4,900 23,000 57,000 -- <br /> 07/16-17/91 2990 -22 12 a 000 -- -- -- -- -- <br /> 10/15/91 Dry <br /> 01/28/92 2931 -2153 000 <br /> 04/30192 2884 -2106 a 000 -- -- -- -- -- -- <br /> 1 111rojecls\73942\maslcrlivp\g30113942gw rls Page 13 of 41 <br />