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ll� lump 41111111111111 mm TABLE I 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- Number Date (feet) (feet) - (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE UVB-MW2 d 08/26/97 775 20 87 -1312 000 12,000 23,000 2,700 13,000 120,000 1,300 UVB-MW2 10/02/97 775 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <2 5 UVB-MW2 11/11/97 7 75 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 1582 -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 7 75 1753 -978 000 230 8 0 25 23 760 <25 UVB-MW2 03/30/99 775 16 63 -888 000 805 76 1 366 240 6,290 <20 UVB-MW2 05105/99 775 16 12 -8 37 000 693 366 457 225 5,510 35 8 UVB-MW2 08/20/99 7 75 1753 -978 000 73 0 759 120 252 2,430 104 UVB-MW2 12/06/99 775 1768 -993 000 23 <1 <1 <1 600 94 UVB-MW2 02/29/00 7 75 15 33 -758 000 27 1 2 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 7 75 1755 -980 000 330 71 29 27 2,100 <2 5 UVB-MW2 12/13/00 7 75 1741 -966 0 00 120 180 19 124 1,800 <2 5 UVB-MW2 03/08/01 775 l6 54 -879 0 00 180 210 44 193 2,700 4 4 UVB-MW2 06/21/01 7 75 1793 -1018 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 1 3 119 1,300 <0 5 UVB-MW2 g 12/04/01 774 1892 -11 18 000 41 <0 5 092 119 330 <5* UVB-MW2 03/05/02 774 1800 -1026 000 112 350 110 410 1,760 h 550 UVB-MW2 03/05/02 774 <0 5* UVB-MW2 06/11/02 774 18 55 -1091 000 18 5 0 7 1 1 1 4 108 h 13 UVB-MW2 06/11/02 774 <0 5* UVB-MW2 09/10/02 774 1978 -1204 000 458 2 3 110 l2 0 1,210 h 23 6 UVB-MW2 09/10/02 7 74 <0 5* UVB-MW2 12/18/02 7 74 1954 -11 80 000 85 6 2 7 143 17 9 878 h <0 5 a Water in well may be residual water in end cap b Unidentified hydrocarbons present G IProjects%739421MASTERIWP�WP030313942gw As Page 44 of45