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C <br /> Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093, Tracy, California <br /> Floating Change Concentrations in pg/L to= L <br /> Tap-of-casing Depth-to- product Water-levet 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 /> 1017194 10.24 -- 37.83 -0.15 <0.5 <0.5 <0.5 <0.5 <50 <br /> 12/16/94 9.97 38.10 0.27 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/28195 10.15 -- 37.92 -0.18 <0.5 <0,5 <0.5 <0.5 <50 -- -- <br /> 4125/95 10.27 37.80 -0.12 <0.5 <0.5 <0.5 <0.5 <50 <br /> 7/27195 10.38 -- 37.69 -0.11 -- -- -- -- __ <br /> 10/26/95 10.41 -- 37.66 -0.03 -- -- -- __ <br /> 2/12/96 10.01 -- 38.06 0.40 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/18/96 10.23 -- 37.84 -0.22 -- -- -- _- -_ <br /> 7/18196 10.40 -- 37.67 -0.17 <0.5 <0.5 <0.5 <0.5 <50 <5 -- <br /> 11/15/96 10.93 -- 37.14 -0.53 -- -- -- -- -- -_ <br /> 3/14/97 -- -- - -- -- -- <br /> ATR-1 1 <br /> -ATR-11 <br /> 8/25/9I 46.84 -- -- __ __ <0.5 <0.5 <0.5 <0.5 <50 <br /> 9/24/91 9.50 -- 37.34 -- -- -- -- -- -- -- -- <br /> 9/25/91 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 1/23192 8.95 -- 37.89 0.55 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/20/92 8.78 -- 38.06 0.17 -- -- -- -- -- -- -- <br /> 4/21/92 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 7/8/92 9.12 -- 37.72 -0.34 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 10/7/92 9.30 -- 37.54 -0.18 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 1/18/93 7.80 -- 39.04 1.50 <0.5 <0,5 <0.5 <0.5 <50 <br /> 4/14/93 8.47 -- 38.37 -0.67 <05 <0.5 <0.5 <0.5 <50 -- -- <br /> 8/31/93 9.38 -- 37.46 -0.91 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/27/93 9.31 -- 37.53 0.07 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/18/94 8.83 -- 38.01 0.48 0.8 1 <0.3 0.6 <10 <br /> 5/20/94 8.93 -- 37.91 -0.10 <0.3 <0.3 <0.3 <0.5 <10 -- <br /> 10/7/94 9.34 -- 37.50 -0.41 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 12/16/94 8.91 -- 37.93 0.43 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/28/95 8.85 -- 3799 0.06 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/25/95 9.11 -- 37.73 -0.26 <0.5 <0.5 <0.5 <0.5 <50 - -- <br /> 7/27/95 9.43 -- 37.41 -0.32 -- -- -- -- -_ <br /> 47471TABLES12093 M AEt7,XLS <br />