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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 N PERSHM AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(Pg/L) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (ft msl) (ft) (ft ms]) (ft) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> M W 1 04/30/92 776 2926 -2150 000 -- -- -- -- -- -- <br /> 08/13/92 2985 -2209 000 -- -- -- -- -- -- <br /> 10/08/92 Dry -- -- -- -- -- -- <br /> 02/23/93 28 55 -2079 000 -- -- -- -- -- <br /> 05/18/93 27 12 -1936 000 19 <0 5 28 1 8 950 -- <br /> 08/22/93 2734 -1958 000 89 <0 5 <0 5 <0 5 710 -- <br /> 12/30/93 2678 -1902 000 12 <0 5 19 7 7 390 -- <br /> 02/17/94 2647 -18 71 000 <0 5 13 <0 5 <0 5 130 -- <br /> 05/10/94 2612 -1836 000 <0 5 13 0 6 0 6 510 -- <br /> 08/02/94 27 59 -1983 000 <0 5 3 5 17 52 780 11/01/94 2794 -20 18 000 <0 5 <0 5 10 2 0 400 -- <br /> 02/17/95 25 35 -1759 000 <0 5 098 1 1 1 1 480 -- <br /> 05/11/95 22 72 -1496 000 <0 5 <0 5 <0 5 <0 5 130 -- <br /> 08/24/95 24 03 -1627 000 <0 5 <0 5 <0 5 <0 5 140 -- <br /> 10/19/95 2461 -1685 000 <05 <05 <05 <05 210 <25 <br /> 02/13/96 2243 -1467 000 <0 5 <0 5 <0 5 <0 5 190 -- <br /> 04/18/96 2004 -12 28 000 <0 5 <0 5 <0 5 <0 5 63 <2 5 <br /> 08/08/96 21 32 -13 56 000 -- -- -- -- -- -- <br /> 11/04/96 <br /> - <br /> 11/04196 21 77 -1401 000 <0 5 <0 5 <0 5 <0 5 120b <2 5 <br /> 02/03/97 1700 -924 000 <0 5 <0 5 <0 5 <0 5 82b <2 5 <br /> 05/08/97 643 1680 -1037 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 <br /> 08/26/97 18 58 -12 15 000 -- -- -- -- -- -- <br /> 11/11/97 <br /> - <br /> 11/11/97 19 15 -1272 000 -- -- -- -- -- -- <br /> 03/03/98 13 30 -6 87 000 -- -- -- -- -- <br /> 05/20/98 1348 -705 000 -- -- -- -- -- -- <br /> j 08/19/98 1492 -849 000 -- -- -- -- -- -- <br /> 11/18/98 1534 -891 000 <05 <05 <05 <05 <50 <25 <br /> j 03/30/99 -- -- -- <br /> 05/05/99 13 88 -745 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 <br /> 08/20/99 15 26 -8 83 000 -- -- -- -- -- <br /> I hrolerts1739421mestu%tp1Q�CG13942,n els Page 3of37 <br />