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TABLE 1 GROUNDWATER MONITORING DATA, FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON, CALIFORNIA Casing Depth Groundwater LPH Concentration ( /L) Well Elevation to Water Elevation Thickness Ethyl- No Date (feet msl) (feet) (feet ms]) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 02/13/96 9 14 2529 -16 15 000 270 68 81 210 2,200 -- 04/18/96 9 14 1940 -1026 000 80 9 5 25 45 1,000 17 08/08/96 9 14 2405 -1491 000 -- -- -- -- __ -- 11/04/96 9 14 2405 -1491 000 -- -- __ __ __ -- 02/03/97 9 14 1963 -1049 000 180 4 6 48 110 1,400 24 05/08/97 854 1942 -1088 000 -- -- -- __ -- 08/26/97 854 2120 -12 66 000 11/11/97 854 Well dry -- -- -- -- __ -- 03/03/98 854 16 16 -762 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 03/03/98 854 <2 0* 05/20/98 854 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 05/20/98 854 <2 0* 08/19/98 854 1748 -8 94 000 5 9 2 2 <0 5 0 63 280 2 6 08/19/98 854 <2 0* 11/18/98 854 1793 -939 000 <05 <05 <05 <05 <50 <25 03/30/99 854 -- -- -- -- -- __ __ -- -- 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 08/20/99 854 1785 -9 31 000 -- -- -- -- -- -- 12/06/99 854 1802 -948 000 -- -- -- -- -- -- 02/29/00 854 1567 -7 13 000 -- -- -- -- -- -- 05/16/00 854 1562 -708 000 -- -- -- -- -- -- 09/11/00 854 1798 -944 000 73 8 4 5 9 11 5 220 <0 5 12/13/00 854 1760 -906 000 3 4 11 18 8 3 90 <0 5 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 06/21/01 854 18.42 -9.88 000 <0.5 <0 5 <0.5 <0.5 160 2 9 06/21/01 854 <5* o`pru3LL[s%73942Z iii.rsler\tNplg6O]S3942gwxls Page 7 o[46