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i • i TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(pg/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE i MW5 06/11/03 858 1960 -1102 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 09/17/03 858 2094 -1236 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 12/08/03 858 2097 -1239 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 03/02/04 858 1950 -1092 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 06/28/04 858 2064 -1206 000 -- -- -- -- -- -- MW5 06/29/04 858 -- -- -- <0 5 15 <0 5 0 9 <50 h <0 5 MW5 09/27/04 858 2147 -1289 000 -- -- -- -- -- -- MW5 09/28/04 858 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 i MW5 12/01/04 858 21 22 -1264 000 -- -- -- -- -- -- MW5 12/02/04 858 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 03124105 858 1931 -1073 000 <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 06/22/05 8 58 1928 -1070 000 -- -- -- -- -- -- MW5 06/23/05 8 58 -- -- -- <0 5 <0 5 <0 5 <0 5 <50 h <0 5 MW5 10/12/05 858 2061 -1203 000 <05 <05 <05 <05 <50 h <25 MW5 12/22/05 858 2049 -1191 000 <0.5 <0.5 <0 5 <0 5 <50 h <2.5 MW6 07/16/87 892 1935 -1043 000 3,100 4,300 1,200 6,600 12,000 -- MW6 04/11/88 892 2304 -1367 062 Not sampled-LPH MW6 09/13/88 892 25 12 -1620 000 19,000 17,000 2,300 12,000 65,000 -- MW6 11/16/88 8 92 2551 -1658 001 19,000 19,000 3,000 12,000 83,000 -- MW6 02/09/89 892 2485 -1593 Sheen Not sampled-LPH MW6 05/31/89 892 2657 -1765 000 20,000 33,000 3,100 23,000 120,000 -- MW6 08/17/89 892 2836 -1944 000 16,000 15,000 2,900 19,000 98,000 -- MW6 12/19/89 892 2880 -1988 000 -- -- -- -- -- MW6 892 Well dry since 03/21/90 MW6 05/11/95 892 25 13 -1621 000 48 25 19 56 720 -- MW6 08/24/95 892 2649 -1757 000 -- -- -- -- -- MW6 10/19/95 892 Well dry -- -- -- -- -- -- MW6 02/13/96 892 Well dry -- -- -- -- -- MW6 04/18/96 892 Well dry -- -- -- -- -- -- MW6 08/08/96 892 Well dry -- -- -- -- -- -- MW6 11/04/96 892 Well dry -- -- -- -- -- -- MW6 02/03/97 892 Well dry -- -- -- -- -- -- glprogects17394Zjnasier<wp1g120513942gw x1s Page M of 59