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I ABLE I 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- No Date (feet msl) (feet) (feet msl) (feet) Benzene Toluene benzene Xylenes TPH-g MTBE MW3 06/21/01 854 1842 -988 000 <05 <05 <05 <05 160 29 MW3 06/21/01 854 <5* 11IIW3 09/20/01 854 1955 -1101 000 -- -- -- -- -- -- MW4 07/16/87 8 13 1815 -1002 000 1,100 <50 850 1,750 4,900 -- MW4 04/11/88 8 13 2123 -13 10 000 510 <25 490 1,100 8,500 -, MW4 09/13/88 8 13 2366 -15 53 000 860 40 670 2,400 5,600 MW4 11/16/88 8 13 23 81 -1568 000 860 340 810 1,000 8,000 -I MW4 02/09/89 8 13 23 55 -1542 000 630 20 530 650 4,800 -= MW4 05/31/89 8 13 2501 -1688 000 790 35 720 1,300 6,000 -= MW4 08/17/89 8 13 2650 -18 37 000 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 -- MW4 01/28/92 813 Dry -- -- -- -- -- MW4 04/30/92 8 13 2953 —2140 000 -- -- -- -- -- MW4 08/13/92 813 Dry -- -- -- -- -- _ MW4 10/08/92 813 Dry -- -- -- -- --MW4 02/23/93 8 13 29 12 -2099 000 MW4 05/18/93 813 -- -- -- -- -- -- -- -- MW4 08/22/93 8 13 28 04 —1991 000 -- -- -- -- -- -- MW4 12/30/93 8 13 2785 —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 28 63 —2050 000 -- -- -- -- MW4 11/01/94 8 13 2898 —20 85 000 -- -- -- -- -- -- MW4 02/17/95 8 13 2641 —18 28 000 6 4 <0 5 3 2 3 4 880 -- c �prniects%73942huasteri"p1g9f)IU942,,A als Pape 8 of 47