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4r TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH _ Concentration 4LYL) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) (feet) feet Benzene Toluene benzene Xylenes TPH-S MTBE UVB-MW2 10/02/97 775 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 UVB-MW2 11/11/97 775 2143 -1368 000 <0 5 099 066 4 1 <50 <2 5 UVB-MW2 03/03/98 775 1595 -820 000 2,200 190 <20 1,300 12,000 <100 UVB-MW2 03/03/98 775 <20* UVB-MW2 05/20/98 775 15 82 -807 000 2,500 180 950 1,300 16,000 560 UVB-MW2 05/20/98 775 <14* UVB-MW2 08/19/98 775 1703 -928 000 14 4 8 2 7 24 250 16 UVB-MW2 08/19/98 775 <2 0* UVB-MW2 11/18/98 775 17 53 -978 000 230 80 25 23 760 <25 UVB-MW2 03/30/99 775 1663 -888 000 805 76 1 366 240 6,290 <20 UVB-MW2 05/05/99 775 1612 -837 000 693 366 457 225 5,510 35 8 UVB-MW2 08/20/99 775 1753 -978 000 730 759 120 252 2,430 104 UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 9 4 UVB-MW2 02/29/00 775 1533 -758 000 27 12 57 5 2 320 <1 UVB-MW2 05/16/00 7 75 1508 -733 000 87 14 2 8 4 680 7 5 UVB-MW2 09/11/00 775 1755 -980 000 330 7 1 29 27 2,100 <2 5 UVB-MW2 12/13/00 7 75 1741 -966 000 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 1654 -879 000 180 210 44 193 2,700 4 4 UVB-MW2 06/21/01 775 17 93 -10 18 000 38 53 6 307 1,200 19 UVB-MW2 06/21/01 775 <5* UVB-MW2 09/20/01 775 19 13 -1138 000 24 3 6 13 119 1,300 <0 5 UVB-MW2 g 12/04/01 7 74 1892 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 41 0 1,760 h 550 UVB-M W 2 03/05/02 774 <0 5* UVB-MW2 06/11/02 7 74 1855 -1081 000 18 5 0 7 1 1 14 108 h 1 3 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 000 458 2 3 110 120 1,210 h 236 UVB-MW2 09/10/02 774 <0 5* UVB-MW2 12/18/02 7 74 1954 -1180 000 85 6 2 7 143 179 878 h <0 5 a Water in well may be residual water in end cap b Unidentified hydrocarbons present c Hydrocarbons ranging from C6-C 12 identified on the gasoline sample chromatogram g 1prajects1739421masterlwplq I202%39426w xis Page 44 of45