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Table 1. Summary of Groundwater Monnrm Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in 4g/L m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE DO <br /> ATR-8 <br /> 8/25/91 45 98 -- -- -- -- 110 <0 5 130 98 2700 <br /> 9/25191 8 85 37 13 -- 95 <0 5 51 97 1400 -- <br /> 1/23/92 829 -- 3769 0 56 2 5 <0 5 <0 5 <0 5 <50 <br /> 4120/92 8 11 -- 3787 0 18 <br /> 4121192 -- -- -- -- 14 0 9 14 9 3 140 <br /> 718/92 848 -- 3750 4 0 <0 5 9 2 0 8 87 <br /> 10/7/92 869 -- 3729 -021 <br /> -- -- -- -- -- -- <br /> 10/8/92 -- - -- 7 8 3 2 11 8 8 140 _- <br /> 1/18/93 709 -- 3889 <br /> 1/19/93 -- 14 0 17 11 34 980 - - <br /> 4114/93 7 80 -- 38 I8 <br /> 4/15/93 — -- -- -- 4 2 <0 5 4 6 4 9 110 -- <br /> 8/31/93 981 -- 36 17 -- 15 0 15 41 71 700 <br /> 10/27/93 868 -- 3730 1 13 620 2100 2800 8700 52000 - <br /> 2/17/94 825 0 14 3783 0 43 <br /> 5/20194 8 55 0 14 3753 -030 <br /> 1017/94 870 0 14 3738 -0 15 -- <br /> 12/16/94 821 Sheen 3777 049 <br /> 2/28/95 845 0 02 3754 -024 <br /> 4/26/95 8 51 050 3782 -006 <br /> 7127195 985 0 12 3621 -134 <br /> -- -- -- -- -- <br /> I0/26/95 928 0 03 3672 0 57 <br />� 2/12196 <br /> 7 87 002 38 12 141 <br /> 4/18196 845 002 3754 -058 -- __ -- -- <br /> 7/18/96 895 3703 -050 72 220 620 2500 88000 <500 <br /> 11/15/96 940 -- 3658 -045 110 130 240 1300 52000 <200 <br /> 3/14197 924 -- 3674 0 16 4 2 <0 5 16 26 350 <2 5 0 10 <br /> 614197 NP 869 — 37.29 0 55 42 5 2 8 2 150 1200 <2 5 003 <br /> ATR-9 <br /> 10/16/90 4868 -- -- -- -- <0 5 <0 5 <0 5 <0 5 <50 <br /> 10/19/90 11 11 -- 3757 <br /> 11/0191 1104 -- 37 64 007 <0 5 <0 5 <0 5 <0 5 <50 - <br /> 4/10/91 1082 -- 3786 022 <0 5 <0 5 <0 5 <0 5 <50 <br /> 47471TADLES=93JUN7 XI,% <br /> I i <br /> I <br />