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w � � 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 05/20/98 7 86 16 11 -825 000 450 460 600 890 7,400 400 RW4 05/20/98 786 <6 7* RW4 08/19/98 786 1751 -965 000 130 240 210 580 3,100 90 RW4 08/19/98 786 <12* RW4 11/18/98 786 1798 -1012 000 300 480 400 970 5,600 <25 RW4 03/30/99 7 86 -- -- __ -- -- -- -- -- -- RW4 05/05/99 7 86 RW4 08/20/99 786 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 1795 -1009 000 5 7 5 8 1 7 7 7 550 <0 5 RW4 12/13/00 7 86 17 85 -999 000 5 6 0 88 17 4 4 820 <0 5 RW4 03/08/01 7 86 17 10 -924 000 <0 5 1 1 3 5 13 9 640 5 5 RW4 06/21/01 7 86 1833 -1047 000 3 6 081 13 251 350 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 7 86 1865 -1079 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 -11 27 000 108 470 230 246 2,520 h 19 0 RW4 06/11/02 7 86 <0 5* RW4 09/10/02 7 86 2038 -12 52 000 599 186 1,240 802 14,800 h 134 RW4 09/10/02 7 86 <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 03/24/03 786 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 06/11/03 786 <0 5* g(protects1739421iiiasterlwp*60313942bw xls Page 35 or 48