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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in pg/L to r <br /> Top-of-casing Deptlf-to- product Water-level since last <br /> Well nuinber 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 /> 1123192 12.12 Sheen 37.81 0.45 <br /> 4120192 11.93 Sheen 38.00 0.19 <br /> 7/8/92 12.22 Sheen 37.71 -0.29 <br /> 1017192 12.38 Sheen 37.55 -0.16 <br /> 1/18/93 11.22 Sheen 38.71 1,16 <br /> 4114/93 11.49 Sheen 38.44 -0.27 <br /> 8/30/93 12.43 Sheen 37.50 -0.94 <br /> 10/27/93 12.39 Sheen 37.54 0.04 <br /> 2/18/94 12.00 -- 37.93 0.39 200 27 120 140 1900 -- -- <br /> 5/20/94 12.07 Sheen 37.86 -0.07 <br /> 111/7/94 12.38 Sheen 37.55 -0.31 <br /> 12/16/94 12.03 Sheen 37.90 0.35 <br /> 2128195 12.05 0.03 37.90 0.00 <br /> 4/26/95 12.32 Sheen 37.61 -0.29 <br /> 7127195 12.51 -- 37.42 -0.19 <br /> 10/26/95 (c) 12.97 -- -- -0.46 -- -- -- -- -- -- -- <br /> 2/12/96 12.10 -- -- 0.87 89 <0.5 43 150 1500 -- -- <br /> 4118196 12.60 -- -- -0.50 -- -- -- -- _- -- -- <br /> 7/18/96 12.60 -- -- 0.00 26 5.2 70 51 1600 1800 -- <br /> 11/15/96 13.40 -- -- -0.80 -- -- _- -- -- -- <br /> 3/14197 13.34 -- -- 0.06 10 <0.5 43 19 1200 620 0.05 <br /> ATR-4 <br /> 4/23187 49.03 10.85 -- 38.18 -- 3000 200 <10 950 21000 -- -- <br /> 12/22/87 11.00 -- 38.03 -0.15 5300 310 430 270 -- -- <br /> 3/24/88 10.98 -- 38.05 0.02 5800 320 930 740 6000 -- -- <br /> 6/23/88 12.11 361.92 -1.13 237 8.8 2 10 5200 -- -- <br /> 9/29/88 10.72 -- 38.31 1.39 1430 115 350 130 1400 -- -- <br /> 2122/89 1091 -- 38.12 -0.19 1300 82 54 170 22000 -- -- <br /> 6/29/89 11.00 -- 38.03 -0.09 590 38 97 220 1300 -- -- <br /> 9/1889 11.19 -- 37.84 -0.19 280 13 49 100 630 -- -- <br /> 12/28/89 11.08 -- 3795 0.11 500 25 56 160 1300 -- -- <br /> 4'7471TABLES12093 MAR7.XLS <br />