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• i • TABLE 1 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE, STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration(}ig/L) Well Elevation to Water Elevation Thickness Ethyl- Number Date (feet) (feet) _ (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 03/03/98 854 16 16 -762 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/03/98 854 <2 0* MW3 05/20/98 954 1602 -748 000 14 <0 5 <0 5 <0 5 170 <2 5 MW3 05/20/98 854 <2 0* MW3 08/19/98 854 1748 -894 000 5 9 2 2 <0 5 063 280 2 6 MW3 08/19/98 854 <2 0* MW3 11/18/98 954 1793 -939 000 <0 5 <0 5 <0 5 <0 5 <50 <2 5 MW3 03/30/99 854 -- -- -- -- -- -- -- __ MW3 05/05/99 854 1640 -786 000 <0 5 <0 5 <0 5 <0 5 <50 <2 0 MW3 08/20/99 954 1785 -931 000 -- -- -- -- -- -- MW3 12/06/99 854 1802 -948 000 MW3 02/29/00 854 1567 -7 13 000 MW3 05/16/00 854 1562 -708 000 -- -- -- _- -- -- MW3 09/11/00 854 1798 -944 goo 7 3 84 59 115 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 1 8 83 90 <0 5 MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 MW3 06/21/01 854 1842 -9 88 000 <0 5 <0 5 <0 5 <0 5 160 2 9 MW3 06/21/01 854 <5* MW3 09/20/01 854 1955 -1101 000 -- -- -- -- _- -- MW3 12/04/01 851 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 851 1850 -9 99 0 00 260 100 050 1 60 290 h 760 MW3 03/05/02 851 <0 5* MW3 06/11/02 8 51 1888 -1037 0 00 -- -- -- _- -- -- MW3 09/10/02 851 2020 -1169 000 16 2 6 1 8 5 9 246 h 6 5 MW3 09/10/02 851 <0 5* MW3 12/18/02 851 1997 -1146 0 00 2 8 2 1 16 4 7 323 h <0 5 MW4 07/16/87 8 13 18 15 -1002 0 00 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 21 23 -13 10 0 00 510 <25 490 1,100 8,500 -- MW4 09/13/88 8 13 2366 -1553 000 860 40 670 2,400 5,600 -- MW4 11/16/88 8 13 2381 -1568 0 00 860 340 810 1,000 8,000 -- MW4 02/09/89 8 13 2355 -15 42 000 630 20 530 650 4,800 -- G 1Projects173942kMASTERIWP1WP0303U942gw As Page 7 of 45