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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 (benzene Xylenes TPH-G MTBE <br /> 7127195 9.43 -- 37.41 -0.32 <br /> 10/26/95 9.59 -- 37.25 -0.16 <br /> 2112196 8.42 -- 38.42 1.17 <0.5 <0.5 <0.5 <0.5 <50 <br /> 4/18/96 9.03 -- 37.81 -0.61 <br /> 7118196 9.45 -- 37.39 -0.42 <0.5 <0.5 <0.5 <0.5 <50 <5 <br /> 11/15/96 9.95 -- 36.89 -0.50 <br /> ATR-12 <br /> 10/16/90 47.08 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 <br /> 10/19/90 9.33 -- 37.75 <br /> 1/10/91 9.16 -- 37.92 0.17 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/10/91 898 -- 38.10 0.18 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/12/91 9.28 -- 37.80 -0.30 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 9/24/91 9.52 -- 37.56 -0.24 <br /> 9/25/91 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 1/23/92 9.06 -- 38.02 0.46 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/20/92 9.00 -- 38.08 0.06 <br /> 4/21/92 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/8/92 9.21 -- 37.87 -0.21 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 10/7/92 9.32 -- 37.76 -0.11 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 1/18/93 8.32 38.76 1.00 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/14/93 8.79 -- 38.29 -0.47 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 8/31/93 9.39 -- 37.69 -0.60 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 10/27/93 9.36 -- 37.72 0.03 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 2/18194 9.02 38.06 0.34 0.4 0.5 <0.3 <0.5 <10 -- <br /> 5/20/94 9.06 -- 38.02 -0.04 <Q.3 <0.3 <0.3 <0.5 <10 -- <br /> 10/7/94 -- -- -- -- -- -- -- --12/16/94 -- -- -- -- -- -- -- -- -- <br /> 2128/95 <br /> 4/25/95 -- -- -- -- -- -- -- -- <br /> 4/26/95 -- -- -- -- -- -- -- -- -- -- <br /> 7/27/95 <br /> 10/26/95 _- -- _-_ --_ _- <br /> 2/12/96 8.85 -- 38.23 0.21 <0.5 <0.5 <0.5 <0 5 <50 -- <br /> 33151TABLLS12093NOV6.XLS <br />