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. Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (continued) <br /> Tap-of-Casing Depth to Groundwater Change since <br /> Well No and Elevation Water Elevation Last Measurement <br /> date (feet)(a) (feet) (feet) (feet) <br /> 4/20/92 -- — -- <br /> 7/8/92 -- — -- <br /> 1017/92 12.21 3744 — <br /> 1/18/93 1133 3832 088 <br /> ATR-8 <br /> 8/25/91 4598 - - <br /> 9/25/91 885 3713 - <br /> 1/23/92 829 3769 056 <br /> 4/20192 811 3787 018 <br /> 7/8/92 848 3750 -037 <br /> 1017/92 869 3729 -021 <br /> 1/18/93 7.09 38.89 1.68 <br /> ATR-9 <br /> 10/16/90 4868 - - - <br /> 10/19/90 11 11 3757 - <br /> . 1110/91 1104 3764 007 <br /> 4/10/91 1082 3786 022 <br /> 7/10/91 1106 3762 -024 <br /> 9/2.4191 1129 3739 -023 <br /> 1/23/92 1096 3772 033 <br /> 4/20/92 1088 37.80 008 <br /> 7/8/92 1106 3762 -018 <br /> 1017192 1116 3752 -010 <br /> 1/18/93 10.34 38.34 8.82 <br /> ATR-10 <br /> 10/16/90 4807 - - - <br /> 10/19/90 1020 37.87 - <br /> 1110/91 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 /> 4120/92 1001 3806 -001 <br /> 7/8/92 10.17 37.90 -016 <br /> 1017192 1023 3784 -006 <br /> 1/18/93 9.61 38.46 062 <br /> ATR-11 <br /> 8/25/91 4684 - - - <br /> 9/24/91 950 37.34 <br /> 1/23/92 895 3789 055 <br /> 4/20/92 878 3806 017 <br />