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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 pg/L m <br /> Top-of-casing Depth-to- product Water-level since last <br /> Well member elevation, water, thickness elevation, measurement, Total <br /> and dale in feet (a) in feet in feet in feet (b) in feet Benzene Toluene lathâ–º (benzene Xylenes; TPH-G MTBE DO <br /> 8/31193 12.24 -- 37.41 -0.49 <05 <0.5 <0.5 <0.5 <50 <br /> 10/27/93 12.23 -- 37.42 0.01 <0.5 <0.5 <0.5 13 <50 _- <br /> 2/18/94 11.93 -- 37.72 0.30 <0.3 <0.3 <0.3 <0.5 <10 -- -- <br /> 5/20/94 12.00 -- 37.65 -0.07 <0.3 <0.3 <0.3 <0.5 <10 <br /> 10/7/94 12.23 -- 37.42 -0.23 <0.5 <0.5 <0.5 <0.5 <50 -- -_ <br /> 12/16/94 11.94 -- 37.71 0.29 <0.5 <0.5 <0.5 <0.5 <50 <br /> 2128195 12.00 -- 37.65 -0.06 <0.5 <0.5 <0.5 <0.5 <50 <br /> 4125195 12.41 -- 37.24 -0.41 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 7/27/95 12.61 -- 37.04 -0.20 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/26/95 12.67 -- 36.98 -0.06 <0.5 <0.5 <0.5 <0.5 <50 <br /> 2/12/96 11.95 -- 37.70 0.72 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 4/18/96 12.35 -- 37.30 -0.40 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7118/96 12.45 -- 37.20 -0.)0 <0.5 <0.5 <0.5 <0.5 <50 28 -- <br /> 11/15/96 13.11 -- 36.54 -0.66 <0,5 <0.5 <0.5 <0.5 <50 120 -- <br /> 3/14/97 13.21) -- 36.45 -0.09 <t1.5 <0.5 <0.5 X0.5 <50 6.3 0.10 <br /> ATR-8 <br /> 8/25/91 45.98 -- -- -- -- 110 <0.5 130 98 2700 -- -- <br /> 9/25/91 8.85 -- 37.13 -- 95 <0.5 51 97 1400 -- -- <br /> 1/23/92 8.29 -- 37.69 0.56 2.5 <0.5 <0,5 <0.5 <50 -- -- <br /> 4/20/92 8.11 -- 37.87 0.18 -- -- -- __ -- <br /> 4/21/92 <br /> -4/21/92 -- -- -- -- 14 0.9 14 9.3 140 -- -- <br /> 7/8/92 8.48 -- 37,50 -0.37 4.0 <0.5 9.2 0.8 87 <br /> 10/7/92 8.69 37.29 -0.21 -- -- -- -- -- -- <br /> 10/8/92 -- -- -- -- 7.8 3.2 11 8.8 140 -- <br /> 1/18/93 7.09 -- 38.89 1.60 -- -- -_ <br /> 1119193 -- -- -- -- 14.0 1.7 11 34 980 -- -_ <br /> 4/14/93 7.80 -- 38.18 -0.71 -- -- -- -- -- <br /> 4/15/93 -- -- -- -- 4.2 <0.5 4.6 4.9 110 -- -- <br /> 8/31/93 9.81 -- 36.17 -2.01 15.0 15 41 71 700 -- <br /> 10/27/93 8.68 -- 37.30 1.13 620 2100 2800 8700 52000 -- <br /> 2/17/94 8.25 0.14 37.83 0.53 -- -- -- __ __ <br /> 4747VrABLI:S12093 MAU XIS <br />