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TABLE 2 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 RW4 09/11/00 786 1795 -1009 0 00 5 7 58 17 7 7 550 <0 5 RW4 12/13/00 7 86 1785 -999 0 00 5 6 088 1 7 4 4 820 <0 5 R W4 03/08/01 7 86 1710 -924 0 00 <0 5 1 1 3 5 13 9 640 5 5 RW4 06/21/01 7 86 1833 -1047 0 00 3 6 081 t 3 2 51 350 6 4 RW4 06/21/01 7 86 <5* RW4 09/20/01 7 86 1958 -1172 000 <2 5 <2 5 <2 5 <2 5 270 <2 5 RW4 12/04/01 7 86 1947 -1161 000 190 76 320 349 2,600 <5* RW4 03/05/02 786 1865 -1079 000 -- -- -- -- --RW4 03/06/02 786 -- -- 198 74 0 316 304 2,350 h 200 j RW4 03/06/02 7 86 <0 5* RW4 06/11/02 786 19 13 -1127 000 108 470 230 246 2,520 h 190 RW4 06/11/02 786 <0 5* RW4 09/10/02 7 86 2038 -1252 000 599 186 1,240 802 14,800 h 134 RW4 09/10/02 7 86 <5* RW4 12/18/02 786 2014 -1228 000 115 450 195 189 1,750 h 200 RW4 12/18/02 7 86 <5* RW4 03/24/03 7 86 1950 -1164 000 -- -- -- -- -- RW4 03/25/03 7 86 -- -- -- 742 264 117 117 1,400 h 7 6 RW4 03/25/03 7 86 <0 5* RW4 06/11/03 786 1974 -11 88 000 112 337 192 159 2,190 h 467 RW4 06/11/03 786 <05* RW4 09/17/03 786 21 20 -1334 0 00 83 0 29 0 148 115 1,740 h 197 RW4 09/17/03 786 <0 5* RW4 12/08/03 7 86 2114 -1328 000 122 366 162 134 2,340 h 9 4 RIx'4 12/08/03 786 <0 5* SW 1 02/17/94 -- Not accessible since 02/17/94 SW 1 02/17/95 -- 2901 Air sparging well--samples not collected S W 1 05/11/95 -- Air sparging well--samples not collected SWI 08/24/95 -- -- Air sparging well--samples not collected SWI 10/19/95 -- -- Air sparging we11--samples not collected SWI 02/13/96 -- -- Air sparging well--samples not collected g 1pro3ects1739421masterlwplq I20R3942gw As Page 37 of 51