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TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON R5 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(Mg/L) _ Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MWI 09/25/90 776 2959 -21 83 000 <0 5 7 0 10 4 7 170 -- MWI 12/19/90 776 Dry __ __ __ __ -- MWI _MW1 01/30/91 776 Dry MWI 05/02/91 776 Dry MWI 07/16-17/91 776 Dry MWI 10/15/91 776 2995 -22 19 a 000 MWI 01/28/92 776 2970 -2194 a 000 MWI 04/30/92 776 2926 -21 50 000 MWI 08/13/92 776 29 85 -2209 000 M W l 10/08/92 776 Dry MWI 02/23/93 776 28 55 -2079 000 -- -- __ -- MWI _MWI 05/18/93 776 27 12 -1936 000 19 <0 5 2 8 1 8 950 M W I 08/22/93 776 2734 -1958 000 8 9 <0 5 <0 5 <0 5 710 MWI 12/30/93 7 76 2678 -1902 000 1 2 <0 5 19 7 7 390 MWI 02/17/94 776 2647 -1871 000 <0 5 1 3 <0 5 <0 5 130 -- MWI 05/10/94 776 26 12 -1836 000 <0 5 1 3 0 6 0 6 510 -- MWI 08/02/94 776 2759 -19 83 0 00 <0 5 3 5 17 5 2 780 _ MWI 11/01/94 776 2794 -20 18 000 <0 5 <0 5 1 0 2 0 400 -- MWI 02/17/95 776 2535 -1759 000 <0 5 098 1 1 1 1 480 - MW 1 05/11/95 776 2272 -1496 000 <0 5 <0 5 <0 5 <0 5 130 MWI 08/24/95 776 24 03 -1627 000 <0 5 <0 5 <0 5 <0 5 140 -- MWI 10/19/95 776 2461 -1685 000 <05 <05 <05 <05 210 <25 M W 1 02/13/96 776 2243 -1467 000 <0 5 <0 5 <0 5 <0 5 190 -- MWI - MWI 04/18/96 776 20 04 -1228 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 MWI 08/08/96 7 76 21 32 -13 56 000 -- -- __ __ MWI 11/04/96 776 2177 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 MWI 02/03/97 776 1700 -924 000 <0 5 <0 5 <0 5 <0 5 82b <2 5 MWI 05/08/97 643 1680 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 08/26/97 643 18 58 -12 15 0 00 -- -- _- __ MWI 11/11/97 643 19 15 -1272 000 MWI 03/03/98 643 13 30 -6 87 000 MWI. 05120/98 643 1348 -7 05 000 g SproJeeu1739421rnasterlwp\gO602U9426nv As Page 3 of 43