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� � awl � � � � 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- T Number Date (feet) feet feet feet Benzene Toluene benzene Xylenes TPH-g MTBE 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 20 14 -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 03/25/03 786 -- -- -- 74 2 264 117 117 1,400 h 7 6 RW4 03/25/03 7 86 <0 5* RW4 06/11/03 7 86 1974 -1188 000 112 337 192 159 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 19 7 RW4 09/17/03 7 86 <0 5* RW4 12/08/03 786 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 7 86 1967 41 81 000 108 415 135 164 1,940 h 35 5 RW4 03/02/04 7 86 <0 5* RW4 06/28/04 786 2090 -1304 000 636 189 804 85 8 1,180 h 8 2 RW4 06/28/04 7 86 <0 5* RW4 09/27/04 786 2191 -1405 000 994 276 111 112 1,590 h 292 RW4 09/28/04 786 <0 5* RW4 12/01/04 7 86 2152 -1366 000 941 292 112 134 1,470 h 322 RW4 12/01/04 7 86 <0 5* RW4 03/24/05 786 1955 -1169 000 -- -- -- -- -- -- RW4 03/25/05 786 -- -- -- 980 290 88 0 100 1,200 h 25 RW4 03/25/05 7 86 <0 5* RW4 06/22/05 7 86 1948 -1162 000 100 23 9 928 104 1,400 h 9 6 RW4 06/22/05 786 <I* RW4 10/12/05 786 2096 -13 10 000 81 23 74 92 1,400 h <12 RW4 12/22/05 7.86 2071 -1285 000 81 20 73 84 990 h <12 SWI 02/17/94 -- Not accessible since 02/17/94 SWI 02/17/95 -- 2801 Air sparging well--samples not collected SWI 05/11/95 -- Aar sparging well--samples not collected SWI 08/24/95 -- Air sparging well--samples not collected g 1pro)edds1739421masterlwp%q 120513942gw xis Page 41 of 59