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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093,Tracy, California <br /> Top-of-casing Depth-to- Floating Water-level Change since Concentrations in L <br /> Well number elevation, water, product thickness elevation, last 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 <br /> 7/8/92 8.48 -- 37.50 -0.37 4.0 <0.5 9.2 0.8 87 <br /> 10/7/92 8.69 -- 37.29 -0.21 <br /> 10/8192 -- -- -- -- 7.8 3.2 11 8.8 140 1 -- <br /> 1/18193 7.09 -- 38.89 1.60 <br /> 1/19193 -- -- -- 14.0 1.7 11 34 980 <br /> 4/14/93 7.80 -- 38.18 -0.71 <br /> 4/15/93 -- -- -- -- 4.2 <0.5 4.6 4.9 110 -- <br /> 8/31193 9.81 -- 36.17 -2.01 15.0 15 41 71 700 -- <br /> 10/27/93 8.68 -- 37.30 1.13 620 2100 2800 8700 52000 -- <br /> 2/17/94 8.25 0.14 37.83 0.53 <br /> 5/20/94 8.55 0.14 37.53 -0.30 <br /> 1017/94 8.70 0.14 37.38 -0.15 <br /> 12/16/94 8.21 Sheen 37.77 0.39 <br /> 2/28/95 8.45 0.02 37.54 -0.23 <br /> 4126195 8.51 0.50 37.82 0.28 <br /> 7127195 9.85 0.12 36.21 -1.61 <br /> 10/26/95 9.28 0.03 36.72 0.51 <br /> 2/12196 7.87 0.02 38.12 1.40 <br /> 4/18/96 8.45 0.02 37.54 -0.58 <br /> 7118/96 8.95 -- 37.03 -0.51 72 220 620 2500 88000 <500 <br /> 11/15/96 9.40 36.58 -0.45 110 130 240 1300 52000 <200 <br /> ATR-9 <br /> 10/16/90 48.68 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 <br /> 10/19/90 11.11 37.57 <br /> 1/10191 11.04 -- 37.64 0.07 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4110191 10.82 -- 37.86 0.22 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/10/91 11.06 -- 37.62 -0.24 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 9/24/91 11.29 -- 37.39 -0.23 <br /> 9125191 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 1/23/92 10.96 -- 37.72 0.33 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/20/92 10.88 -- 37.80 0.0$ <br /> 4/21192 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/8/92 11.06 -- 37.62 -0.18 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 3315UABLESU093NOWALS <br />