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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration ( /L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet ms]) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 05/11/95 8 13 23 84 -15 71 000 91 <1 0 87 2 9 520 MW4 08/24/95 8 13 2522 -1709 000 28 20 35 7 2 870 MW4 10/19/95 8 13 25 70 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -15 35 000 4 4 <1 0 12 1 1 750 -- MW4 04/18/96 8 13 2117 -13 04 000 10 <1 0 12 10 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 52 <0 50 450 74 MW4 11/04/96 8 13 2280 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 MW4 02/03/97 8 13 1832 -10 19 000 93 <2 0 11 3 5 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 0 83 3 5 <0 5 780 10 MW4 08/26/97 7 18 19 71 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 000 8 9 0 80 058 <0 5 640 13 MW4 03/03/98 7 18 6 0* MW4 05/20/98 7 18 1455 -737 000 15 <5 0 35 9 1 1,100 <25 MW4 05/20/98 7 18 65* MW4 08/19/98 7 18 1606 -8 88 000 1 1 16 4 3 <0 5 680 <2 5 MW4 08/19/98 7 18 7 7* MW4 11/18/98 7 18 1640 -922 000 <0 5 14 5 4 <0 5 770 c 15 MW4 03/30/99 7 18 -- -- -- -- -- -- -- -- MW4 05/05/99 7 18 14 90 -7 72 000 <0 5 <0 5 1 14 <0 5 542 7 2 MW4 08/20/99 7 18 1645 -927 000 14 0 151 <0 5 1 68 460 203 MW4 12/06/99 7 18 1655 -937 000 <1 <1 1 8 4 7 330 8 9 MW4 02/29/00 7 18 14 12 -694 000 4 3 <1 <1 <1 100 7 MW4 05/16/00 7 18 14 14 -696 000 19 <1 <1 <1 190 6 9 MW4 09/11/00 718 1649 -931 000 <05 <05 <05 <05 330 72 MW4 12/13/00 7 18 1635 -9 17 000 <0 5 5 8 082 5 1 360 13 MW4 12/13/00 7 18 )0* I SPn,let t�%73I421rnasterlu p�g9O]53942ew x is PdaL 9 of 47 I