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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 ms]) (feet) (feet MSI) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW9 05/20/98 657 13 86 -729 000 3 5 <0 5 <0 5 <0 5 220e 22 <br /> 05/20/98 20* <br /> 08/19/98 15 50 -8 93 000 081 68 <0 5 <0 5 340 45 <br /> 08/19/98 44* <br /> 11/18/98 15 73 -916 000 <0 5 <0 5 <0 5 <0 5 310 c 18 <br /> 03/30/99 13 85 -728 000 -- -- -- -- -- -- <br /> 05/05/99 1423 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 <br /> 08/20/99 1569 -9 12 000 -- -- -- -- _- <br /> 12/06/99 15 83 -926 000 -- -- -- __ -- -- <br /> 02/29/00 1333 -676 000 <1 <1 <1 <1 <50 48 <br /> 05/16/00 13 39 -682 000 -- -- -- -- -- -- <br /> 03/08/01 1472 -8.15 0.00 <0 5 <0 5 <0 5 <0 5 <50 7 6 <br /> MW 10 04/11/88 861 23 18 -1457 000 640 130 170 140 3,100 -- <br /> 09/13/88 25 85 -1724 000 4,800 130 340 240 7,700 -- <br /> 11/16/88 2608 -1747 000 5,800 290 700 340 9,400 -- <br /> 02/09/89 2570 -1709 000 7,500 450 220 320 8,800 -- <br /> 05/31/89 2744 -18 83 000 11,000 320 1,600 800 24,000 -- <br /> 08/17/89 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 -- <br /> 03/21/90 Not accessible -- -- -- -- -_ <br /> 05/17/90 Not accessible -- -- -- -- __ <br /> 06/27/90 3252 -2391 000 9,700 4,800 2,400 5,300 51,000 -- <br /> 09/25/90 33 95 -25 34 000 13,000 9,900 2,700 8,900 71,000 -- <br /> 12/19/90 33 79 -25 18 000 16,000 16,000 3,300 11,000 81,000 -- <br /> 01/30/91 3424 -25 63 000 18,000 15,000 2,600 9,900 62,000 -- <br /> 05/02/91 3424 -25 63 000 6,900 5,700 2,100 5,900 27,000 -- <br /> 07/16-17/91 35 13 -26 52 a 000 -- -- -- -- -- -- <br /> f�pro3ecis'73942htnasterlwP1g30113942gw x 1s Page 17 of 4 S <br />