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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 X lenes TPH-g MTBE MW 10 12/06/99 729 1766 -1037 0 00 -- -- -- -- -- MW10 02/29/00 729 1534 -805 000 <1 <1 <1 <1 <50 <l MW 10 05/16/00 729 1542 -813 000 -- -- -- -- -' MW10 09/11/00 7 29 1743 -10 14 0 00 0 8 2 <D 5 197 50 <0 5 MW 10 12/13/00 729 17 29 -1000 000 <0 5 <0 5 <0 5 <0 5 62 <0 5 MW 10 03/08/01 729 1654 -925 000 <0 5 <0 5 <0 5 <0 5 78 <0 5 MW 10 06/21/01 729 1792 -1063 000 <0 5 <0 5 <0 5 <0 5 <50 1 2 MW 10 06/21/01 729 <5 MW 10 09/20/01 7 29 1911 -1182 000 -- -- -- -- -- MW 10 12/04/01 725 1889 -1164 000 -- -- -- -- -- MW 10 03/06102 725 1790 -10 65 000 3 10 <0 5 <0 5 <0 5 369 h 140 MW10 03/06/02 7 25 <0 5* MW10 06/11/02 725 -- - _ MW 10 09/10/02 725 -- -- MW 10 12/18/02 725 -- -- -- -- -- -- MW 10 03/24/03 725 1226 -501 000 350 <0 5 <0 5 <0 5 541 h 86 MW l0 03/24/03 725 <0 5* MW10 06/11/03 7 25 19 15 -1190 000 560 05 1 2 3 9 663 h 14 2 MW10 06/11/03 7 25 <0 5* MW l0 09/17/03 725 20 64 -1339 000 4 10 <0 5 <0 5 22 594 h 110 MW10 09/17/03 7 25 <0 5* MW10 12/08/03 725 2054 -13 29 000 17 5 17 0 7 3 1 1,030 h 9 7 MW I0 12/08/03 725 <0 5* MW 10 03/02/04 7 25 19 19 -1194 000 14 8 1 1 0 7 2 1 794 h 163 MW10 03/02/04 7 25 <0 5* MW10 06/28/04 725 2033 -1308 000 880 2 2 05 41 1,040 h 98 MW 10 06/28/04 725 <0 5* MW10 09/27/04 725 2136 -1411 000 -- -- -- -- MW 10 09/28/04 725 -- -- -- 118 17 0 7 6 2 1,190 h 1 1 9 MW 10 09/28/04 725 <0 5* MW10 12/01/04 725 2092 -1367 000 190 2 8 2 2 86 1,320 h 148 <0 5* MW 10 12/01/04 725 Page 23 of 56 g IprojectsM942Vnasterlwplg12040942gw xis