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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 µg/1, to= L <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 /> 5120194 10.97 -- 37.71 -0.08 <0.3 <0.3 <0.3 <0.5 <10 -- -- <br /> 10/7/94 11.19 -- 37.49 -0.22 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 12/16/94 10.91 -- 37.77 0.28 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/28/95 10.93 -- 37.75 -0.02 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4125195 11.46 -- 37.22 -0.53 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 7/27/95 11.73 -- 3695 -0.27 <br /> 10/26/95 11.80 -- 36.88 -0.07 <0.5 <0.5 <0.5 <0.5 <50 - -- <br /> 2/12196 10,90 -- 37.78 0.90 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/18/96 11.30 -- 37.38 -0.40 <br /> 7/18196 11.68 -- 37.00 -0,38 <0.5 <0.5 <0.5 <0.5 <50 <5 -- <br /> 11/15/96 12.23 -- 361.45 -0.55 -- -- -- -- -- __ __ <br /> 3/14197 12.23 -- 36.45 0.00 <0.5 <0.5 <0.5 <t1.5 <50 -- 0.20 <br /> ATR-10 <br /> 10/16/90 48.07 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> I0/19/90 10.20 -- 37.87 -- -- -- -- _ -- -- -- <br /> 1/10191 10.07 -- 38.00 0.13 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/10/9t 10.00 -- 38.07 0.07 <0.5 <0.5 <0.5 <0.5 <50 --7/12/9) 10.21 -- 37.86 -0.21 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 9124191 10.32 -- 37.75 -0.11 _- <br /> 9/25/91 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 1123192 10.00 -- 38.07 0.32 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/20/92 10,01 -- 38.06 -0.01 -- -- -- -- <br /> 4/21/92 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 7/8/92 10.17 -- 37.90 -0.16 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/7/92 10.23 -- 37.84 -0.06 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 1/18/93 9.61 -- 38.46 0.62 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/14/93 9.94 -- 38.13 -0.33 <0.5 <0.5 <0.5 <0.5 <50 <br /> 8130/93 10.23 -- 37.84 -0.29 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/27/93 10.24 37.83 -0.01 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/18194 10.02 -- 38.05 0.22 <0.3 0.4 <0.3 <0.5 <10 -- -- <br /> 5/20/94 10.09 -- 37.98 -0.07 <0.3 <0.3 <0.3 <0.5 <10 <br /> 474717'ABLE812093 MAR7.XL5 <br />