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� � 1• � � 1• � � � 1• � 1• � � � 1• 1• l• 1• 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 TPH,g MT13E MW8 12/13/00 645 22* MW8 03/08/01 645 1431 -786 000 15 44 880 1,545 13,000 19 MW8 06/21/01 645 1567 -922 000 13 61 240 580 5,700 17 MW8 06/21/01 645 22* MW8 09/20/01 645 1674 -1029 000 -- -- -- __ __ -- MW8 12/04/01 642 1648 -1006 000 MW8 03/05/02 642 1570 -928 000 -- MW8 03/06/02 6.42 -- -- -- 060 500 233 577 215 h <0 5 MW9 04/11/88 788 2081 -1293 000 <50 <50 <50 <50 2,100 -- MW9 09/13/88 788 23 14 -1526 000 85 67 100 90 35,000 -- MW9 11/16/88 788 2324 -1536 000 70 12 14 19 2,200 -- MW9 02/09/89 788 2279 -1491 000 12 16 4 1 34 800 -- MW9 05/31/89 788 2447 -1659 000 14 <0 5 12 1 3 540 -- MW9 08/17/89 788 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- MW9 12/19/89 788 2697 -1909 000 66 1 1 <0 5 l2 470 -- MW9 03/21/90 788 2745 -1957 000 84 1 0 2 1 37 160 -- MW9 05/17/90 788 2823 -2035 000 20 093 089 <0 5 120 -- MW9 09/25/90 788 Dry __ __ __ __ __ _> MW9 12/19/90 788 2933 -2145 000 MW9 01/30/91 788 Dry MW9 05/02/91 788 2945 -21 57 000 MW9 07/16-17/91 788 2960 -2172 a 000 MW9 10/15/91 788 Dry MW9 01/28/92 788 Dry MW9 04/30/92 788 2907 -21 19 000 MW9 08/13/92 788 2947 -2159 000 MW9 10/08/92 788 Dry MW9 02/23/93 788 2836 -2048 000 -- -- __ MW9 05/18/93 788 -- -- __ MW9 08/22/93 788 Not accessible MW9 12/30/93 788 Not accessible MW9 02/17/94 788 Not accessible -- -- __ __ __ MW9 05/10/94 788 26 15 -1827 000 3,100 29 52 89 7,400 -- g5projects1739425masterlwplg030213942gw xis Page 14 of 39