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i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration(yg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MWI 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 -2150 000 MWI 08/13/92 776 2985 -2209 000 MWI 10/08/92 776 Dry MWI 02/23/93 776 2855 -2079 000 -- -- __ -- MWI MW1 05/18/93 776 27 I2 -1936 000 19 <0 5 2 8 18 950 -- MWI 08/22/93 776 2734 -1958 000 89 <0 5 <0 5 <0 5 710 MWI 12/30/93 776 2678 -1902 000 12 <0 5 19 77 390 MWI. 02/17/94 776 2647 -1871 000 <0 5 13 <0 5 <0 5 130 MWI 05/10/94 776 26 12 -1836 000 <0 5 13 06 06 510 MWI 08/02/94 776 2759 -1983 000 <0 5 35 17 52 780 MWI 11/01/94 776 2794 -2018 000 <0 5 <0 5 10 20 400 MWI 02/17/95 776 2535 -1759 000 <0 5 098 1 1 1 1 480 -- M W 1 05/11/95 776 2272 -1496 000 <0 5 <0 5 <0 5 <0 5 130 MWI 08/24/95 776 2403 -1627 000 <0 5 <0 5 <0 5 <0 5 140 -- MWI 10/19/95 776 2461 -1685 000 <0 5 <0 5 <0 5 <0 5 210 <2 5 MWI 02/13/96 776 2243 -1467 000 <0 5 <0 5 <0 5 <0 5 190 -- MWI 04/18/96 776 2004 -1228 000 <05 <05 <05 <05 63 <25 MWI 08/08/96 776 2132 -1356 000 -- -- __ -- MWI _MW1 11/04/96 776 2177 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 M W 1 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 15 000 -- -- -- __ -- MWI 11/11/97 643 19 15 -1272 000 MWI 03/03/98 643 1330 -687 000 MWI 05/20/98 643 1348 -705 000 MWI 08/19/98 643 1492 -849 000 -- -_ __ __ __ MW l 11/18/98 643 1534 -891 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW l 03/30/99 643 -- -- __ __ -- MWI _MW1 05/05/99 643 1388 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 g\PMJCLts1739421masterlwntig090213942gw As Page 3 of 41 I