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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(µg/L) _ <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 11/11/97 645 1898 -1253 000 <50 700 2,500 9,100 36,000 <250 <br /> 11/11/97 645 69* <br /> 03/03/98 645 13 02 -657 000 <50 780 1,900 6,500 26,000 <250 <br /> 03/03/98 645 <100* <br /> 05/20/98 645 1336 -691 000 71 200 2,000 4,600 31,000 <125 <br /> 05/20/98 645 43* <br /> 08/19/98 645 1491 -846 000 77 1,300 2,300 7,800 31,000 310 <br /> 08/19/98 645 <100* <br /> 11/18/98 645 15 15 -870 000 38 220 2,900 7,100 27,000 <125 <br /> 03/30/99 645 1330 -685 000 -- -- __ -- -- <br /> 05/05/99 645 1367 -722 000 188 789 1,580 3,000 19,100 46 1 <br /> 08/20/99 645 15 15 -870 000 -- -- __ -- <br /> 12/06/99 645 1525 -880 000 <br /> 02/29/00 645 1276 -631 000 31 110 1,100 2,330 10,000 42 <br /> 05/16/00 645 1297 -652 000 -- -- -- -- <br /> 09/11/00 <br /> _09/11/00 645 -- -- -- -- -- -- -- -- <br /> 12/13/00 645 1520 -975 000 31 11 410 3675 4,200 37 <br /> 12/13/00 645 22* <br /> 03/08/01 645 1431 -786 000 15 44 880 1,545 13,000 19 <br /> 06/21/01 645 1567 -922 000 13 61 240 580 5,700 17 <br /> 06/21/01 645 22* <br /> MW9 04/11/88 7 88 2081 -1293 000 <50 <50 <50 <50 2,100 -- <br /> 09/13/88 788 23 14 -1526 000 85 67 100 90 35,000 -- <br /> 11/16/88 7 88 2324 -1536 000 70 12 14 19 2,200 -- <br /> 02/09/89 788 2279 -1491 000 12 16 4 1 3 4 800 -- <br /> 05/31/89 7 88 2447 -1659 000 14 <0 5 12 13 540 -- <br /> 08/17/89 788 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- <br /> 12/19/89 788 2697 -1909 000 66 1 1 <0 5 12 470 -- <br /> 03/21/90 7 88 2745 -1957 000 8 4 10 2 1 3 7 160 -- <br /> 05/17/90 7 88 2823 -2035 000 2 0 093 089 <0 5 120 -- <br /> 09/25/90 788 Dry -- __ -- -_ -- <br /> 12119/90 788 2933 -2145 000 <br /> a'projecls1739421mastcrlttp\g601'3942gw Ms Page 13 of 37 <br />