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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(1L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-a MTBE i MWI 01/28/92 776 2970 -2194 a 000 MWI. 04/30/92 776 2926 -2150 000 -- MWI 08/13/92 776 2985 -2209 000MWI 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 28 18 950 MWI 08/22/93 776 2734 -1958 000 89 <0 5 <0 5 <0 5 710 MWI. 12/30/93 776 2678 -19 02 000 12 <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 13 0 6 0 6 510 MWI 08/02/94 776 2759 -1983 000 <0 5 3 5 17 5 2 780 MWI 11/01/94 776 2794 -20 18 000 <0 5 <0 5 10 2 0 400 MWI 02/17/95 776 2535 -1759 000 <0 5 098 1 1 I 1 480 MWI 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 <0 5 <0 5 <0 5 <0 5 63 <2 5 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 MWI 02/03/97 776 17 00 -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 1858 -12 15 000 -- __ -_ -- MWI. _MW1 11/11197 643 19 15 -1272 000 M W 1 03/03/98 643 1330 -687 000 MWI 05/20/98 643 1348 -7 05 000 MWI 08/19/98 643 1492 -849 000 -- -_ __ MWI 11/18/98 643 1534 -891 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MWI 03/30/99 643 -- __ MWI 05/05/99 643 13 88 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MWI. 08/20/99 643 1526 -883 000 -- -- -- MWI, _MW1 12/06/99 643 1542 -899 000MWI 02/29/00 643 -- -- MWI _MW1 05/16/00 643 13 19 -676 000 g 4piojeus173942Vnaste6wp\gD3Q213942gw xls Page 3 of 39