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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(,ug/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE - 1w] 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 M1 08/19/98 690 <4 0* IW 1 11/18/98 690 1602 -912 000 16 <5 0 78 40 1,300 26 IW1 03/30/99 690 -- -- -- __ -- _- IW 1 05/05/99 690 1452 -762 000 1 56 <1 0 148 725 2,170 106 IWI 08/20/99 690 1600 -910 0 00 -- -- -- -- _- -- M 1 12/06/99 690 1622 -932 000 <1 <1 19 8 5 420 1 9 1WI 02/29/00 690 1373 -6 83 000 <1 <1 <1 <1 68 <1 1W 1 05/16/00 690 13 82 -6 92 000 7 6 <1 16 <1 490 2 4 IW 1 09/11/00 690 16 15 -925 000 051 <0 5 096 <0 5 590 <0 5 IWI 12/13/00 690 16 00 -910 000 <0 5 <0 5 <0 5 1 92 690 <0 5 1W l 03/08/01 690 15 13 -823 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 1W 1 06/21/01 690 1651 -961 000 <0 5 <0 5 1 5 0 6 800 5 7 IW 1 06/21/01 690 <5* IW 1 09/20/01 690 1761 -1071 000 6 9 <2 5 <2 5 <2 5 <250 <2 5 1W1 12/04/01 687 1737 -1050 000 3 <0 5 13 <0 5 310 <5* 1 W i 03/05/02 687 1653 -966 000 108 070 12 6 130 895 h 121 1W1 03/05/02 687 <5 0* lW 1 06/11/02 6 87 1708 -1021 000 11 1 <0 5 107 13 704 h 8 5 1W1 06/11/02 687 <0 5* 1w) 09/10/02 6 87 1822 -1135 0 00 9 8 <0 5 8 5 1 1 738 h 101 IWI 09/10/02 6 87 <0 5* IWI 12/18/02 6 87 1794 -1107 000 115 0 8 81 1 2 747 h <0 5 IWI 03/24/03 6 87 1740 -1053 000 100 <0 5 7 8 <0 5 859 h 6 6 [WI 03/24/03 6 87 <0 5* 1W] 06/11/03 b 87 1757 -1070 000 182 0 8 9 0 13 1,140 h 122 IWI 06/11/03 6 87 <0 5* M W I 01/87 776 -- -- -- <1 <1 -- <1 <50 -- M W l 07/16/87 776 -- -- -- <0 5 1 5 <0 5 <0 50 <100 i -- MW I 04/11/88 776 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 -- MW 1 09/13/88 776 22 18 -1442 000 1 9 2 5 <0 5 <0 5 70 -- I;1projects1739421masterlwp\gO603139426w xIs Page 2 of 48