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Table I. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in µg/L in <br /> gfl- <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well number elevation, ,vater, thickness elevation, measurement, Total <br /> and date in feet (a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene X leases TPH-G MTBE DO <br /> 10/26/95 13.40 -- 37.18 -0.18 - <br /> 10/27/95 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 2112/96 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 /> 11/15/96 13.74 -- 36.84 -0.46 <br /> 3/14/97 13.68 -- 36.90 0.06 <0.5 <0.5 <0.5 <0.5 <50 0.3.0 <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 /> 3/24188 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.I0 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 H.64 37.58 -0,14 2.9 <0.3 <0.3 <0.3 50 -- -- <br /> 10/16/90 11.81 -- 37.41 -0.17 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/19/90 11.81 -- 37.41 0.00 <br /> 1110/91 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 /> 1123192 11.60 -- 37.62 0.42 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/20/92 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 /> 1017/92 11.83 -- 37.39 -0.08 5.7 <0.5 <0.5 <0.5 59 -- -- <br /> 1/18/93 __ __ -- -- -- -- - -- -- -- -- <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 /> 47471TABLES12093MAR7.XJ S <br />