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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 /> MW9 03/03/98 657 68* <br /> 05/20/98 657 1386 -729 000 3 5 <0 5 <0 5 <0 5 220e 22 <br /> 05/20/98 657 20* <br /> 08/19/98 657 15 50 -893 000 081 68 <0 5 <0 5 340 45 <br /> 08/19/98 657 44* <br /> 11/18/98 657 1573 -916 000 <05 <05 <05 <05 310c 18 <br /> 03/30/99 657 13 85 -728 000 -- _- _- -- <br /> 05/05/99 657 14 23 -766 000 <0 5 <0 5 <0 5 <0 5 93 1 5 12 <br /> 08/20/99 657 1569 -9 12 000 -- -- _- _- <br /> 12/06/99 657 15 83 -926 000 -- -- -- -_ <br /> 02/29/00 657 13 33 -676 000 <1 <1 <1 <1 <50 48 <br /> 05/16/00 657 13 39 -682 000 -- -- _- -- _- <br /> 09/11/00 657 -- -- -_ <br /> 12/13/00 657 -- -- -- -- -- -- _- <br /> 03/08/01 657 1472 -815 000 <05 <05 <05 <05 <50 76 <br /> 06/21/01 6 57 16.14 -9.57 0.00 <0.5 <0 5 <0.5 <0 5 110 17 <br /> 06/21/01 657 19* <br /> MW 10 04/11/88 861 23 18 -1457 000 640 130 170 140 3,100 -- <br /> 09/13/88 861 25 85 -1724 000 4,800 130 340 240 7,700 -- <br /> 11/16/88 861 2608 -1747 000 5,800 290 700 340 9,400 -- <br /> 02/09/89 861 2570 -1709 000 7,500 450 220 320 8,800 -- <br /> 05/31/89 861 2744 -18 83 000 11,000 320 1,600 800 24,000 -- <br /> 08/17/89 861 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 -- <br /> 03/21/90 861 Not accessible -- -- -- -- -- <br /> 05/17/90 861 Not accessible -- -- -- _- -- <br /> 06/27/90 861 32 52 -2391 000 9,700 4,800 2,400 5,300 51,000 <br /> o%pro3ecrs1739421uiaslerlwply60]ti3942gw x1s Page 18 of 46 <br />