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. Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (continued) <br /> Top-of-Casing Depth to Groundwater Change since <br /> Well No and Elevation Water Elevation Last Measurement <br /> date (feet)(a) (feet) (feet) (feet) <br /> 1/23/92 1096 3772 033 <br /> 4/20/92 1088 3780 008 <br /> 7/8/92 1106 3762 -018 <br /> 10/7/92 11 16 3752 -010 <br /> 1/18/93 1034 3834 082 <br /> 4/14/93 1070 3798 -036 <br /> 8/30/93 1117 3751 -047 <br /> ATR-10 <br /> 10/16/90 4807 - - - <br /> 10/19/90 1020 3787 - <br /> 1/10/91 1007 3800 013 <br /> 4/10/91 1000 3807 007 <br /> 7/12/91 1021 3786 -021 <br /> 9/24/91 1032 3775 -011 <br /> 1/23/92 1000 3807 032 <br /> 4/20/92 1001 3806 -001 <br /> 7/8/92 1017 3790 -016 <br /> 10[7/92 1023 3784 -006 <br /> 1/18/93 961 3846 062 <br /> 4/14/93 994 3813 -033 <br /> 8/30/93 1023 37.84 -029 <br /> ATR-11 <br /> 8/25/91 4684 - - - <br /> 9/24/91 950 3734 - <br /> 1/23/92 895 3789 055 <br /> 4/20/92 878 3806 017 <br /> 7/8/92 912 3772 -034 <br /> 1017/92 930 3754 -018 <br /> 1/18/93 780 3904 150 <br /> 4/14/93 847 3837 -067 <br /> 8/31/93 938 37 46 -0.91 <br /> ATR-12 <br /> 10/16/90 4708 - - <br /> 10/19/90 933 3775 - <br /> 1/10/91 916 3792 017 <br /> 4/10/91 898 3810 018 <br />. <br /> 7/12/91 928 3780 -030 <br /> 9/24/91 952 3756 -024 <br />