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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 I RW4 05/05/99 7 86 -- -- -- -- -- -- __ -- RW4 08/20/99 7 86 -- -- -- -- -- -- -- -- -- RW4 12/06/99 7 86 RW4 02/29/00 7 86 -- -- -- -- -- -- -- -- -- RW4 05/16/00 7 86 1520 -734 000 5 6 57 220 363 2,500 21 RW4 09/11/00 7 86 17 95 -1009 000 57 58 17 7 7 550 <0 5 RW4 12/13/00 7 86 17 85 -9 99 000 5 6 0 88 17 44 820 <0 5 RW4 03/08/01 7 86 17 10 -924 000 <0 5 1 1 3 5 13 9 640 55 RW4 06/21/01 7 86 18 33 40 47 000 3 6 081 13 251 350 6 4 RW4 06/21/01 7 86 <5* R W4 09/20/01 786 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 7 86 1865 40 79 000 -- -- -- -- -- -- RW4 03/06/02 7 86 -- -- -- 198 740 316 304 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 7 86 <0 5* RW4 09/10/02 7 86 2038 42 52 000 599 186 1,240 802 14,800 h 134 RW4 09/10/12 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 -11 64 000 -- -- -- -- -- -- 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 7 86 1974 -1188 000 112 33 7 192 159 2,190 h 467 RW4 06/11/03 7 86 <0 5* RW4 09/17/03 786 2120 -1334 000 830 29.0 148 115 1,740 h 19 7 RW4 09/17/03 7 86 <0 5* S W 1 02/17/94 -- Not accessible since 02/17/94 SW 1 02/17/95 -- 2901 Air spargmg well--samples not collected SWI 05/11/95 -- -- Air spargmg well--samples not collected SWI 08/24/95 -- Air sparging well--samples not collected S W 1 10/19/95 - Air spargmg well--samples not collected g Ipso)eus173�14?UnasterkAplq(K)0313942gw xls Page 34 of 47