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TABLE I GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA <br /> Casing Depth Groundwater LPH Concentration ( A- <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 03/30/99 6 45 13 30 -685 000 -- -- __ __ __ <br /> 05/05/99 645 13 67 -722 000 188 78 9 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 12 97 -652 000 -- -- __ _- _- -- <br /> 09/11/00 645 -- -- __ __ __ <br /> 12/13/00 645 1520 -8 75 000 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 6 45 1567 -9.22 0.00 13 61 240 580 5,700 17 <br /> 06/21/01 645 22* <br /> MW9 04/11/88 7 88 2081 -12 93 000 <50 <50 <50 <50 2,100 -- <br /> 09/13/88 7 88 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 1 6 4 1 3 4 800 -- <br /> 05/31/89 7 88 2447 -1659 000 14 <0 5 12 13 540 -- <br /> 08/17/89 7 88 2605 -18 17 000 5 <0 5 2 <0 5 <250 -- <br /> 12/19/89 7 88 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 0 93 0 89 <0 5 120 -- <br /> 09/25/90 7 88 Dry -- -- -- -- <br /> 12/19/90 788 2933 -2145 000 -- -- -- -- -- -- <br /> 01/30/91 788 Dry <br /> 05/02/91 7 88 2945 -2157 000 -- -- -- -- -- __ <br /> 07116-17191 7 88 2960 -2172 a 000 -- -- -- -- -- -- <br /> b'prolccisW39421mastcrl%�p\gMU942gwx1s Page 16 of 46 <br />