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Table 1. Summary of Groundwater Monitoring Data: Water Elevations and Analyses <br /> ARCO Facility 2093,Tracy, California <br /> Top-of-casing Depth-to- Floating Water-level Change since Concentrations in L <br /> Well number elevation, water, product thickness elevation, last measurement, Total <br /> and date in feet(a) in feet in feet in feet(b) in feet Benzene Toluene Eth (benzene Xylenes TPH-G MTBE <br /> 4/10/91 11.52 -- 37.83 0.12 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 7/10/91 11.76 -- 37.59 -0.24 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 9/24/91 11.95 - 37.40 -0.19 <0.5 <0.5 <0.5 <0.5 <50 <br /> 1/23/92 11.66 -- 37.69 0.29 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4120192 11.56 -- 37.79 0.10 <br /> 4/21/92 -- -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -_ <br /> 7/8192 11.72 -- 37.63 -0.16 <0.5 <0.5 <0.5 <0.5 <50 <br /> 10/7/92 11.82 -- 37.53 -0.10 <0.5 <0.5 <0.5 <0.5 <50 <br /> 1/18193 11.04 -- 38.31 0.78 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 4/14/93 11.42 -- 37.93 -0.38 75 <0.5 <0.5 <0.5 310 <br /> 8/31/93 -- -- -- -- -- -- -- -- -- <br /> 10/27/93 11.84 -- 37.51 -0.42 <0.5 <0.5 <0.5 - <0.5 <50 _. <br /> 2/17/94 -- -- -- -- -- -- -- __ <br /> 5/20/94 -- -- -- -- -- -- -- -- -- <br /> 10/7/94 11.85 -- 37.50 -0.01 <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 12/16/94 11.54 -- 37.81 0.31 <0.5 <0.5 <0.5 <0.5 <50 -. <br /> _. _ <br /> y_ _._... . _.. ._. .- ....__ - ..._. 37:70-- .. -._.._ 0.I f <0.5'-- -45__.,.. <0.5- <0.5 <50 <br /> 4/26195 -- __ -- -- -- -- -- -- __ <br /> 7/27195 -- -- -- -- -- -- -- -- __ <br />` 10/26/95 12.18 -- 37.17 -0.53 <0.5 <0.5 <0.5 <0.5 <S0 <br />' 2/12/96 11.57 -- 37.78 0.61 <0.5 <0.5 <0.5 <0.5 <50 -- <br />' 4/18/96 11.91 -- 37.44 -0.34 <br /> 7/18/96 12.01 -- 37.34 -0.10 <0.5 <0.5 <0,5 <0.5 <50 10 <br /> 11/15/96 12.63 -- 36.72 -0.62 <br /> I ATR-7 <br /> 3/10/89 49.65 -- -- -- -- <0.5 <0.5 <0.5 1.7 <200 -- <br /> 6/21/89 11.90 -- 37.75 -- 1 <0.3 0.6 0.5 <50 -. <br /> 9/18/89 11.98 -- 37.67 -0.08 0.4 <0.3 <0.3 1.1 <50 -- <br /> 12/27/89 11.94 -- 37.71 0.04 10 0.9 2.7 7.9 90 <br /> 4/18/90 12.01 -- 37.64 -0.07 6.1 2.6 2.1 5.8 <50 -- <br /> 10/16/90 -- -- -- <0.5 <0.5 <0.5 <0.5 <50 -- <br /> 10/19/90 12.20 -- 37.45 -0.19 <br /> 1/10/91 -- -- -- -- 6 <0.5 1.8 4.1 <50 <br />!I 33151TABLM2093t+OWALS <br />.E <br />� -��. -.- ..tet-�.-.,,ter-�--- _..._.,,,..-.. .�_..__�,.R __,r_-...�-,..-......�,...,..«-,......-_-•� . .._...,,f- .-.�.,-,.--'-_ - �-.�T�.�,.J.... <br />