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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/L m <br /> Tap-of-casing Depth-to- product Water-level since last <br /> Well number elevation, water, thickness elevation, measurement, Total <br /> and date is feet (a) in feet in feet in feet(b) in feet Benzene Toluene Eth lbenzene Xylenes TPH-G MTBE D40 <br /> ATR-1 <br /> 4/23/87 50.58 12.49 -- 38.09 -- <0.5 <0.5 <0.5 23 <100 -- -- <br /> 12/22/87 12.63 -- 37.95 -0.14 5.9 <0.5 0.9 <0.5 -- -- --- <br /> 3/24/88 12.54 38.04 0.09 <0.5 <0.5 <0.5 <0.5 -- -- - <br /> 6/23/88 12.83 -- 37.75 -0.29 <0.5 1.3 4.3 2.2 - <br /> 9/29/88 13.01 -- 37.57 -0.18 <0.5 <0.5 <0.5 <0.5 -- -- - <br /> 2/22/89 12.46 -- 38,12 0.55 1.4 <0.5 <0.5 1.8 <100 -- <br /> 6/21/89 12.37 -- 38.21 0.09 360 0.8 2.1 36 520 -- - <br /> 9/18/89 12.88 37.70 -0.51 250 1200 570 7100 27000 - <br /> 12/27/89 12.68 -- 37.90 0.20 3.4 <0.3 1.3 1.4 <50 -- - <br /> 4/18/90 12.84 -- 37.74 -0.16 21 1.5 16 16 13 --10/16/90 -- -- -- -- 1 <0.5 2 2 <50 -- --- <br /> 10/19/90 13.10 -- 37.48 -0.26 -- -- -- -- -- -- - <br /> 1/10/91 12.78 37.80 0.32 2.4 <0.5 5.7 2.3 <50 -- - <br /> 4/10/91 12.52 -- 38.06 0.26 1.3 <0.5 4.8 <0.5 73 -- --- <br /> 7/10/91 12.95 -- 37.63 -0.43 2 <0.5 4.7 1.7 90 -- - <br /> 9/24/91 13.30 -- 37.28 -0.35 <0.5 <0.5 <0.5 <0.5 <50 -- - <br /> 1/23/92 12.77 -- 37.81 0.53 <0.5 <0.5 <0.5 <0.5 <50 -- --- <br /> 4/20/92 12.58 -- 38.00 0.19 <0.5 <0.5 <0.5 <0.5 <50 -- - <br /> 7/8/92 12.90 37.68 -0.32 <0.5 <0.5 0.6 <0.5 <50 -- - <br /> 10/7/92 13.09 -- 37.49 -0.19 <0.5 <0.5 <0.5 <0.5 <50 --1/18/93 <br /> -- -- __ <br /> 4/14/93 12.31 -- 38.27 0.78 <0.5 <0.5 1.5 <0,5 <50 -- - <br /> 8/30/93 13.18 -- 37.40 -0.87 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/27/93 13.13 -- 37.45 0.05 <0.5 <0.5 <0.5 <0.5 <50 -- --- <br /> 2/18/94 12.65 -- 37.93 0.48 0.6 1 1 0.8 17 -- --- <br /> 5/20/94 12.71 -- 37.87 -0.06 0.6 0.3 1.4 <0.5 27 -- - <br /> 10/7/94 13.14 -- 37.44 -0.43 <0.5 <0.5 <0.5 <0.5 <50 -- --- <br /> 12/16/94 12.74 -- 37.84 0.4 <0.5 <0.5 <0,5 <0.5 <50 -- - <br /> 2/28/95 12.65 -- 37.93 0.09 <0.5 <0,5 I <0.5 <50 -- - <br /> 4/26/95 12.90 -- 37.68 -0.25 <0.5 <0.5 <0.5 <0.5 <50 -- - <br /> 7/27/95 13.22 -- 37.36 -0.32 -- -- -- -- -- -- - <br /> 47471TABLES12093 MAIt7..'R'L._S <br />