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Mir IMTABLE2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration ( IL) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW9 09/13/88 788 23 14 -1526 000 85 67 100 90 35,000 -- MW9 11/16/88 7 88 2324 -1536 000 70 12 14 19 2,200 -- MW9 02/09/89 788 2279 -1491 000 12 16 4 1 3 4 800 -- MW9 05/31/89 788 2447 -1659 0 00 14 <0 5 1 2 1 3 540 -- MW9 08/17/89 7 88 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- MW9 12/19/89 7 88 2697 -1909 000 66 1 1 <0 5 12 470 -- MW9 03/21/90 7 88 2745 -1957 000 84 1 0 2 1 3 7 160 -- MW9 05/17/90 7 88 28 23 -2035 000 2 0 093 089 <0 5 120 -- MW9 09/25/90 7 88 Dry -- __ __ __ __ MW9 12/19/90 7 88 2933 -2145 000 MW9 01/30/91 788 Dry MW9 05/02/91 788 2945 -21 57 000 MW9 07116-17/91 788 2960 -2172 a 000 MW9 10/15/91 788 Dry MW9 01/28/92 7 88 Dry MW9 04/30/92 788 2907 -21 19 000 MW9 08/13/92 788 2947 -21 59 000 MW9 10/08/92 788 Dry MW9 02/23/93 7 88 2836 -2048 000 MW9 05/18/93 788 -- -- __ MW9 08/22/93 788 Not accessible MW9 12/30/93 7 88 Not accessible MW9 02/17/94 7 88 Not accessible -- -- _. MW9 05/10/94 788 2615 -1827 000 3,100 29 52 89 7,400 -- MW9 08/02/94 788 2765 -1977 000 4,900 230 120 490 13,000 - MW9 11/01/94 7 88 2797 -2009 000 4,300 270 170 700 12,000 - MW9 02/17/95 7 88 2538 -1750 000 2,200 89 100 410 7,100 -- MW9 05/11/95 7 88 2396 -1608 000 2,500 68 110 490 8,300 -- MW9 08/24/95 788 2439 -1651 000 490 6 0 38 110 1,200 -- MW9 I0/19/95 7 88 24 85 -1697 000 840 120 100 320 4,900 79 MW9 02/13/96 7 88 2255 -1467 000 890 <10 110 220 4,400 -- MW9 04/18/96 788 2035 -1247 000 780 220 110 460 5,700 <125 glprojects1739421mas[erlwplg0603U942bw xis Page 17 of 48