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si <br /> .r. <br /> 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 /> 2112196 12.30 -- 38.28 1.10 <0.5 <0.5 2.2 <0.5 120 -- <br /> 4/18/96 12.90 -- 37.68 -0.60 -- -- -- -- -- -- <br /> 7/18/96 13.28 37.30 -0.38 <0.5 <0.5 <0.5 <0.5 <50 <5 <br /> t I/15/96 13.74 -- 36.84 -0.46 <br /> ATR-2 <br /> 4/23/87 49.22 11.28 -- 37.94 -- <0.5 0.6 <0.5 <0.5 <100 -- <br /> 12/22/87 11.40 -- 37.82 -0.12 <0.5 <0.5 <0.5 <0.5 -- <br /> 3/24/88 11.35 -- 37.87 0.05 <0.5 <0.5 <0.5 <0.5 -- -- <br /> 6/23/88 11.55 -- 37.67 -0.20 <0.5 <0.5 <0.5 <0.5 -- -- <br /> 9/29/88 11.71 -- 37.51 -0.16 <0.5 <0.5 <0.5 <0.5 -- -- <br /> 2/22/89 11.35 -- 37.87 0.36 1.8 0.7 0.6 3.4 370 -- <br /> 6/21/89 11.45 -- 37.77 -0.10 1.9 <0.3 0.4 <0.3 <50 -- <br /> 9/18/89 11.65 -- 37.57 -0.20 1.9 0.9 1.1 8.2 9 -- <br /> 12/27/89 11.50 -- 37.72 0.15 3.5 <0.3 1.1 0.3 <50 -- <br /> 4/18/90 11.64 -- 37.58 -0.14 2.9 <0.3 <0.3 <0.3 50. -- <br /> 1`0/16790_ 37.41 ,0:17 . ,. _.�0.5�' <0.-5'- '--<0.5 -<0.5_: ._ <_5-0_--- - _-- <br /> 10/19/90 11.81 -- 37.41 0.00 -- -- -- -- -- <br /> 1/10/91 11.58 -- 37.64 0.23 0.8 <0.5 <0.5 <0.5 <50 -- <br /> 4/10/91 11.35 -- 37.87 0.23 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/10/91 11.74 -- 37.48 -0.39 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 9/24/91 12.02 -- 37.20 -0.28 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 1/23/92 11.60 -- 37.62 0.42 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4120/92 11.53 -- 37.69 0.07 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/8/92 11.75 -- 37.47 -0.22 2.8 <0.5 <0.5 <0.5 <50 -- <br /> 1.0/7/92 11.83 -- 37.39 408 5.7 <0.5 <0.5 <0.5 59 1/18/93 <br /> -- -- -- -- <br /> 4/14/93 11.29 -- 37.93 0.54 3.8 0.7 0.8 1.9 55 -- <br /> 8/30/93 11.96 -- 37.26 -0.67 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 10/27/93 11.95 -- 37.27 0.01 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 2/18/94 11.54 -- 37.68 0.41 0.7 0.9 <0.3 0.7 <10 -- , <br /> 5/20/94 11.61 -- 37.61 -0.07 0.9 <0.3 <0.3 <0.5 <10 - <br /> 10/7/94 11.93 -- 37.29 -0.32 <0.5 <0.5 <0.5 <0.5 <50 --if <br /> 12/16/94 11.56 -- 37.66 0.37 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 33151TABLEES12093N0V6.XLS <br />