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• i 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 03/06/02 7 86 -- -- -- 198 74 0 316 304 2,350 h 200 RW4 03/06/02 7 86 <0 5* RW4 06/11/02 7 86 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 0 00 599 186 1,240 802 14,800 h 134 RW4 09/10/02 786 <5* RW4 12/18/02 786 2014 -1228 000 115 450 195 189 1,750 h 200 RW4 12/18/02 786 <5* RW4 03/24/03 7 86 1950 -1164 000 -- -- RW4 03/25/03 796 -- -- -- 74 2 264 117 117 1,400 h 7 6 RW4 03/25/03 786 <0 5* RW4 06/11/03 7 86 1974 -1188 000 112 337 192 159 2,190 h 467 RW4 06/11/03 786 <0 5* RW4 09/17/03 7 86 2120 -1334 0 00 83 0 290 148 115 1,740 h 197 RW4 09/17/03 786 <0 5* RW4 12/08/03 7 86 21 14 -1328 000 122 366 162 134 2,340 h 9 4 RW4 12/08/03 786 <0 5* RW4 03/02/04 7 86 1967 -1181 000 108 415 135 164 1,940 h 35 5 RW4 03/02/04 7 86 <0 5* RW4 06/28/04 786 2090 -13 04 000 63 6 189 804 858 1,180 h 8 2 RW4 06/28/04 786 <0 5* SWI. 02/17/94 -- Not accessible since 02/17/94 SWI. 02/17/95 -- 2801 Airs sparging wesamples-- les not collected p p SWI 05/11/95 -- -- Airs sparging ging wet!--samples not collected SWI. 08/24/95 -- Air sparging well--samples not collected SWI 10/19/95 -- -- Air sparging well samples not collected SWI. 02/13/96 -- -- Air sparging well--samples not collected SWI 04/18/96 -- -- Air sparging well--samples not collected SWI 08/08/96 -- Air sparging well--samples not collected SWI 11/04/96 -- 2424 -- 0 00 2,400 3,100 290 2,800 25,000 <250 SWI 02/03/97 -- -- glprojects173942Lnasterlwp1gO70413942gw xls Page 39 of 54