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0 • TABLE 2 GROUNDWATER MONITORING DATA,FORMER EXXON RS 7-3942,4444 NORTH PERSHING AVENUE,STOCKTON,CALIFORNIA Casing Depth Groundwater LPH Concentration( L) Wcll Elevation to Water Elevation Thickness Ethyl- NOrnber Date (feet) (feet) (feet) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW4 05/31/89 8 13 2501 -1688 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 28 06 -1993 000 400 68 340 160 3,200 -- MW4 05/17/90 8 13 2887 -2074 000 300 40 150 93 3,500 -- MW4 01/28/92 813 Dry -_ __ __ __ -- _ MWS 04/30/92 8 13 2953 -21 40 000 MWS 08/13/92 813 Dry MW4 10/08/92 813 Dry MW4 02/23/93 8 13 29 12 -2099 000 MW4 05/18/93 8 13 -- -- __ MW4 08/22/93 813 28 04 -1991 000 MW4 12/30/93 8 13 27 85 -1972 000 MW4 02/17/94 8 13 2749 -1936 000 MW4 05/10/94 8 13 27 17 -1904 000 MW4 08/02/94 8 13 2863 -2050 000 MW4 11/01/94 8 13 2898 -2085 000 -- -- __ __ __ MW4 02/17/95 8 13 2641 -1828 000 6 4 <0 5 3 2 3 4 880 -- MW4 05/11/95 8 13 23 84 -1571 000 9 1 <1 0 8 7 2 9 520 -- MW4 08/24/95 8 13 2522 -1709 000 28 20 35 7 2 870 -- MW4 10/19/95 8 13 25 70 -1757 000 19 <5 0 18 6 0 1,000 <25 MW4 02/13/96 8 13 2348 -1535 000 4 4 <1 0 12 1 1 750 -- MW4 04/18/96 8 13 21 17 -1304 000 10 <1 0 12 1 0 430 <5 0 MW4 08/08/96 8 13 2241 -1428 000 4 4 <0 5 5 2 <0 50 450 74 MW4 11/04/96 8 13 22 80 -1467 000 <0 5 <0 5 5 3 <0 5 730 15 MW4 02/03/97 8 13 18 32 -1019 000 93 <2 0 11 3 5 1,400 17 MW4 05/08/97 7 18 1792 -1074 000 13 083 3 5 <0 5 780 10 MW4 08/26/97 7 18 19 71 -1253 000 7 6 <1 0 <1 0 <1 0 440 c 12 MW4 11/11/97 7 18 2022 -1304 000 <2 0 <2 0 <2 0 <2 0 720 c <10 MW4 03/03/98 7 18 1457 -739 0 00 8 9 080 058 <0 5 640 13 MW4 03/03/98 7 18 6 0* MW4 05/20/98 7 18 1455 -737 0 00 15 <5 0 35 9 1 1,100 <25 9 1Projects1739421tuaslerlui)Ig0304U942bw xjs P4,e 9 of 52