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TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration(µglL) <br /> Well Elevation to Water Elevation Thickness Ethyl- <br /> No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE <br /> MW8 08/19/98 645 1491 -846 000 77 1,300 <br /> 2,300 7,800 31,000 310 <br /> 08/19/98 <100* <br /> 11/18/98 1515 -870 000 38 220 2,900 7,100 27,000 <125 <br /> 03/30/99 13 30 -685 000 -- -- __ __ __ -- <br /> 05/05/99 13 67 -722 000 188 789 1,580 3,000 19,100 461 <br /> 08/20/99 15 15 -870 000 -- -- _- __ _- <br /> 12/06/99 1525 -880 000 -- -- __ __ __ <br /> 02/29/00 1276 -631 000 31 110 1,100 2,330 10,000 42 <br /> 05/16/00 1297 -652 000 -- __ __ __ __ -- <br /> 09/11/00 -- -- -- -- -- _ — -- -- <br /> MW9 04/11/88 788 2081 -1293 000 <50 <50 <50 <50 2,100 -- <br /> 09/13/88 23 14 -1526 000 85 67 100 90 35,000 -- <br /> 11/16/88 2324 -1536 000 70 12 14 19 2,200 -- <br /> 02/09/89 2279 -1491 000 12 16 4 1 3 4 800 -- <br /> 05/31/89 2447 -1659 000 14 <0 5 12 13 540 -- <br /> 08/17/89 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- <br /> 12/19/89 2697 -1909 000 66 1 1 <0 5 12 470 -- <br /> 03/21/90 2745 -1957 000 84 10 2 1 3 7 160 -- <br /> 05/17/90 28 23 -2035 000 2 0 093 0 89 <0 5 120 -- <br /> 09/25/90 Dry __ __ __ __ <br /> 12/19/90 2933 -2145 000 <br /> 01/30/91 Dry <br /> 05/02/91 2945 -2157 000 <br /> 07/16-17191 29 60 -2172 a 000 <br /> 10/15/91 Dry <br /> 01/28/92 Dry <br /> 04/30/92 2907 -21 19 000 -- -- -- -- __ <br /> 08/13/92 2947 -2159 000 <br /> 10/08/92 Dry <br /> 02123193 2836 -2048 000 <br /> f 4projecls%739425masteAwplg9ooU942bw As Page l 3 of 37 <br />