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w w w �■■� ww w w w � w ■w � ■w TA13LE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration Well Elevation to Water Elevation Thickness Ethyl- Number Date feet feet feet feet Benzene Toluene benzene Xylenes TPH- MTBE RW4 06/11/02 786 19 13 -1127 000 108 470 230 246 2,520 h 190 I RW4 06/11/02 7 86 <0 5* RW4 09/10/02 7 86 2038 -1252 000 599 186 1,240 802 14,800 h 134 RW4 09/10/02 786 <5* RW4 12/18/02 7 86 2014 -1228 000 115 45 0 195 189 1,750 h 200 RW4 12/18/02 7 86 <5* RW4 03/24/03 786 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 -1188 000 112 337 192 159 2,190 h 467 RW4 06/11/03 7 86 <0 5* RW4 09/17/03 7 86 2120 -1334 000 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 7 86 <0 5* RW4 03/02/04 786 19 67 -1181 000 108 415 135 164 1,940 h 35 5 RW4 03/02/04 7 86 <0 5* RW4 06/28/04 7 86 2090 -1304 000 63 6 189 804 85 8 1,180 h 8 2 RW4 06/28/04 786 <0 5* RW4 09/27/04 7 86 2191 -1405 000 994 276 lit 112 1,590 h 292 RW4 09/28/04 7 86 <0 5* SWI 02/17/94 -- Not accessible since 02/17/94 SWI. 02/17/95 -- 2801 Air spargmg well--samples not collected SWI 05/11/95 -- -- Aar spargmg well--samples not collected SWI, 08/24/95 -- -- Air sparging well--samples not collected SWI. 10/19/95 -- -- Air spargmg well--samples not collected SWI 02/13/96 -- -- Air spargmg well--samples not collected SWI 04/18/96 -- -- Air spargmg well--samples not collected SWI 08/08/96 -- Air spargmg well--samples not collected SWI 11/04/96 -- 2424 -- 000 2,400 3,100 290 2,800 25,000 <250 SWI, 02/03/97 -- -- -- -- -- -- -- -- -- -- g 1profects1739421masterlwplg0904�3942gw xis Page 40 of 56