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• TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( /L) Well EIevahon to Water Elevation 1 hickness Ethyl- Nu bu Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE I MW9 03/08/01 657 1472 -815 000 <0 5 <0 5 <0 5 <0 5 <50 76 MW9 06/21/01 657 16 14 -957 000 <0 5 <0 5 <0 5 <0 5 110 17 MW9 06/21/01 657 MW9 09/20/01 657 17 17 -1060 000 -- -_ 19* MW9 12/04/01 652 1685 -1033 000 -- __ __ _ _ MW9 03/05/02 652 1600 -948 000 -- -- MW9 03/06/02 652 -- -- -- <0 5 <0 5 <0 5 <0 5 101 h 102 MW9 03/06/02 652 150* MW9 06/11102 652 -- -_ MW9 09/10/02 652 1772 -1 1 20 000 _� - _-- MW9 12/18/02 652 1738 -1086 000 -- _ MW9 03/24/03 652 1696 -1044 000 __ -- - MW9 03/25/03 652 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h 283 MW9 03/25/0, 652 MW9 06/11/03 652 17 10 -1058 000 -- __ __ 29 2* MW9 09/17/03 652 1859 -1207 000 __ _ -- -- MW9 12/08/03 652 1843 -1191 000 -- _- __ Y MW9 03/02/04 652 1691 -1039 000 <0 5 <0 5 <0 5 <0 5 <50 h 1 7 MW9 03/02/04 652 <0 5* M W 10 04/11/88 8 61 23 18 -1457 000 640 130 170 140 3,100 MW10 09/13/88 861 25 85 -1724 000 4,800 130 340 240 7,700 MWI0 11/16/88 861 2608 -1747 000 5,800 290 700 340 9,400 MW 10 02/09/89 861 2570 -1709 000 7,500 450 220 320 8,800 M W i 0 05/31/89 861 2744 -1883 000 11,000 320 1,600 800 24,000 f MWI0 08/17/89 861 2945 -2084 000 12,000 2,100 3,100 2,500 35,000 MW10 03/21/90 861 Not accessible -- MW 10 05/17/90 861 Not accessible __ MW 10 06/27/90 861 3252 -23 91 000 9,700 4,800 2,400 5,300 51,000 MW 10 09/25/90 8 61 3395 -2534 000 13,000 9,900 2,700 8,900 71,000 MWI0 12/19/90 8 61 33 79 -25 18 000 16,000 16,000 3,300 11,000 81,000 MW 10 01/30/91 861 3424 -2563 000 18,000 15,000 2,600 9,900 62,000 -- g 1pro3cc€sl739421mas€erlwp\gp30413942xw xis Page 20 or 52