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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 M1'V3 09/11/00 854 1798 -9 44 000 73 84 59 115 220 <0 5 MW3 12/13/00 854 1760 -906 000 3 4 11 1 8 8 3 90 <0 5 MW3 03/08/01 854 1706 -852 000 <0 5 <0 5 <0 5 <0 5 210 <0 5 NI W 3 06/21/01 854 1842 -9 88 000 <0 5 <0 5 <0 5 <0 5 160 2 9 AIW3 06/21/01 854 <5* MW3 09/20/01 854 1955 -1101 0 00 -- -- -- -- MW3 12/04/01 8 51 1935 -1084 000 077 <0 5 <0 5 <0 5 71 <5* MW3 03/05/02 8 51 1850 -999 000 260 1 00 050 160 290 h 760 NIW3 03/05/02 8 51 <0 5* MW3 06/11/02 8 51 18 88 -1037 000 -- -- -- -- MW3 09/10/02 851 2020 -11 69 000 1 6 2 6 1 8 5 9 246 h 6 5 111 W 3 09/10/02 8 51 <0 5* KM3 12/18/02 851 1997 -1146 000 2 8 2 1 16 4 7 323 h <0 5 NM 03/24/03 851 1940 -1089 000 -- -- -- __ MW3 03/25/03 8 51 -- -- -- 500 18 4 0 5 6 755 h <0 5 MW3 06/11/03 8 51 1956 -1105 000 182 6 1 148 12 3 1,510 h 344 MW3 06/11/03 851 <0 5* MW3 09/17/03 851 2094 -1243 000 920 6 2 12 4 167 1,510 h 268 MNVI:; 09/17/03 851 <0 5* NtW3 12/08/03 8 51 2094 -1243 000 570 61 9 0 11 1 I,270 h 163 R1W3 12/08/03 851 <0 5* MW4 07/16/87 8 13 18 15 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 21 23 -13 10 000 510 <25 490 1,100 8,500 -- NRV4 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 -- AIW4 11/16/88 8 13 23 81 -1568 0 00 860 340 810 1,000 8,000 -- MW4 02/09/89 8 13 23 55 -1542 0 00 630 20 530 650 4,800 -- MW4 05/31/89 8 13 2501 -16 88 000 790 35 720 1,300 6,000 -- MW4 08/17/89 8 13 2650 -1837 000 1,000 45 940 1,100 8,100 -- MW4 12/19/89 8 13 2757 -1944 000 190 2,800 1,100 380 7,900 -- MW4 03/21/90 8 13 2806 -1993 000 400 6 8 340 160 3,200 -- MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 -- 1A\N4 01128192 813 Dry __ -- __ __ -- b Iprojects1739421mas[erlwp1g1203U942gw xis Page 8 of 51