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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 }Lg/L to <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 /> 10/27/93 t 1.95 -- 3727 0.01 <0,5 <0.5 <0.5 <0.5 <50 -- -- <br /> 2/18/94 11.54 -- 37.68 0.41 0.7 0.9 <0.3 0.7 <10 -- - <br /> 5/20194 11.61 -- 37.61 -0.07 0.9 <0.3 <0.3 <0.5 <10 -- - <br /> ]0/7/94 11.93 -- 37.29 -0.32 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 12/16/94 11.56 -- 37.66 0.37 <0.5 <i0 <0.5 <0.5 <50 -- <br /> 2/28195 11.60 -- 37.62 -0.04 <0.5 <0.5 <0.5 <0.5 <50 -- - <br /> 4125/95 11.95 -- 37.27 -0.35 <0,5 <0.5 <0.5 <0.5 <50 -- -- <br /> 7/27/95 I2.91 -- 36.31 -0.96 <0.5 <0.5 <0.5 <0.5 <50 -- -- <br /> 10/26/95 12.26 -- 36.96 0.65 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 2/12/96 11.40 -- 37.82 0.86 <0.5 <05 <0.5 <0.5 <50 -- -- <br /> 4/18/96 11.90 -- 37.32 -0.50 <2.5 <2.5 <2.5 <2.5 <250 -- -- <br /> 7118/96 12.10 -- 37.12 -0.20 <0.5 <0.5 <0.5 <0.5 <50 500 -- <br /> 11/15/96 12.70 -- 36.52 -0.60 <0.5 <0.5 <0.5 <0.5 <50 750 - <br /> 3/14/97 12.70 -- 36.52 0.00 <0.5 <0.5 <0.5 <0.5 <50 280 0.08 <br /> ATR-3 <br /> 4/23/87 49.93 11.79 38.14 -- 2300 180 <5.0 2300 17000 -- <br /> 12/22/87 11.93 -- 38,00 -0.14 5000 50 530 250 - <br /> 3124/88 12.58 -- 37.35 -0.65 8300 8700 4400 7800 43000 -- -- <br /> 6/23/88 11.17 -- 38.76 1.41 6160 4221 1800 4750 70000 -- -- <br /> 9/29/88 12.23 -- 37.70 -1.06 8850 17600 2190 8I70 57400 -- <br /> 2122189 11.82 -- 38.11 0.41 1000 2100 480 2000 110000 -- -- <br /> 6/29/89 -- -- -- -- 890 520 250 1100 4500 -- -- <br /> 9/18/89 12.19 -- 37.74 -0.37 1000 1300 460 2200 7400 -- - <br /> 12/28/89 12.01 -- 37.92 0.18 840 1400 840 5600 27000 -- -- <br /> 4/18/90 12.15 -- 37.78 -0.14 1000 490 340 1500 4800 -- <br /> 10/16/90 12.35 -- 37.58 -0.20 1900 1300 780 4600 14000 -- - <br /> 10/19/90 12.28 -- 37.65 0.07 <br /> 1/10191 12.01 -- 37.92 0.27 610 230 160 670 2600 -- - <br /> 4/10/91 11.82 -- 38.11 0.19 9t0 120 110 190 3000 -- - <br /> 7/10/91 12.23 -- 37.70 441 420 300 340 760 19000 -- - <br /> 9/24/91 12.57 -- 37.36 -0.34 280 81 69 1.30 2000 -- -- <br /> 47471TABLFS12093MAIZ' NLS <br />