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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 ( /L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes Tl1-I-g MTBE i W I 08/19/98 690 1566 -876 000 12 <2 5 120 79 1,600 28 IWI 08/19/98 690 <4 0* IWI 11/18/98 690 1602 -9 12 000 16 <5 0 78 40 1 300 26 IWI 03/30/99 690 -- __ -- IW 1 05/05/99 690 1452 -762 000 156 <1 0 148 725 2,170 106 IWI 08/20/99 690 1600 -9 l0 000 -- -- __ __ IWI 12/06/99 690 1622 -932 000 <1 <1 19 85 420 1 9 IWI 02/29/00 690 1373 -683 000 <1 <1 <1 <l 68 <1 IWI 05/16/00 690 13 82 -692 000 76 <1 1 6 <1 490 24 lW 1 09/11/00 690 1615 -925 000 051 <0 5 096 <0 5 590 <0 5 IWI 12/13/00 690 1600 -9 l0 000 <0 5 <0 5 <0 5 1 92 690 <0 5 1w] 03/08/01 690 15 13 -8 23 000 <0 5 <0 5 <0 5 <0 5 <50 <0 5 IW1 06/21/01 690 1651 -961 000 <05 <05 15 06 800 57 1 W 1 06/21/01 690 <5* ]WI 09/20/01 690 1761 -1071 000 69 <2 5 <2 5 <2 5 <250 <2 5 IWI 12/04/01 687 1737 -1050 000 3 <0 5 13 <0 5 310 <5* IWI 03/05/02 687 16 53 -966 000 108 070 126 1 30 895 h 12 1 IWI 03/05/02 6 87 <5 0* IWI 06/11/02 687 1708 -1021 000 11 1 <0 5 107 13 704 h 85 IWI 06/11/02 687 <0 5* MWI 01187 776 -- -- -- <1 <1 -- <1 <50 -- MWI - MW1 07/16/87 776 -- -- -- <0 5 1 5 <0 5 <0 50 <100 _ MWI 04/11/88 776 2051 -1275 000 <0 5 <0 5 <0 5 <0 5 <100 MWI 09/13/88 776 22 18 -1442 000 1 9 2 5 <0 5 <0 5 70 MWI 11/16/88 776 2307 -1531 000 <05 95 <05 <05 130 MWI 02/09/89 776 2264 -1488 000 1 7 02 02 06 <250 MWI 05/31/89 776 2926 -2150 000 <0 5 <0 5 <0 5 08 <250 -- M W 1 08/17/89 776 2587 -18 11 000 <0 5 <0 5 <0 5 <0 5 <250 MWI 12/19/89 776 2922 -21 46 000 <0 5 1 9 <0 5 <0 5 <250 MWI 03/21/90 776 2746 -1970 000 <0 5 <0 5 08 29 80 MWI 05/17/90 776 2824 -2048 000 <0 5 45 <0 5 <0 5 120 -- blpro3cclsM9421mastcr\wp1gG602\3942gw x1s Page 2 of 43