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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( /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 /> P1 08/26/97 643 1882 -1239 000 -- -- __ __ <br /> 11/11/97 643 1936 -1293 000 <05 <05 <05 <05 <50 <25 <br /> 03/03/98 643 1341 -698 000 20 1 1 91 28 940 13 <br /> 03/03/98 643 3 7* <br /> 05/20/98 643 13 75 -732 000 20 <5 0 110 19 1,600 <25 <br /> 05/20/98 643 3 1* <br /> 08/19/98 643 15 21 -879 000 16 2 5 17 13 250 3 0 <br /> 08/19/98 643 <2 0* <br /> 11/18/98 643 1561 -918 000 -- -- _- __ <br /> 03/30/99 643 -- -- __ <br /> 05/05/99 643 1437 -7 94 000 <br /> 08/20/99 643 -- -- __ <br /> 12/06/99 643 <br /> 02/29/00 6 43 -- -- -- -_ - -- -- -05/16/00 643 <br /> 09/11/00 643 <br /> 12/13/00 643 <br /> 03/08/01 643 <br /> 06/21/01 643 -- -- -_ -- -- -- -- -- -_ <br /> P2 01/30/91 787 3022 -2235 000 -- -- -- __ __ <br /> 05/02/91 7 87 30 13 -2226 000 140 13 650 610 5,400 -- <br /> 07/16-17/91 7 87 3105 -23 18 000 61 <5 300 220 5,200 -- <br /> 10/15/91 787 3164 -2377 000 20 8 2 90 63 1,500 -- <br /> 01/28/92 7 87 2993 -22 06 000 53 24 170 120 2,900 -- <br /> 04/30/92 7 87 2951 -2164 000 52 <2 5 160 120 2,000 -- <br /> 08/13/92 7 87 31 53 -2366 000 45 12 100 76 2,100 -- <br /> �pm)eus1739421master\,A ply6Ol1 3942gw Is Page 26 of 46 <br />