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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California(cont'd) <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 /> 9/24/91 1129 3744 -027 <br /> 1/23/92 1078 3795 0.51 <br /> 4120/92 10.70 3803 0.08 <br /> ATR-6 <br /> 3/10/89 4935 - - - <br /> 6/21/89 (b) 1154 3781 - <br /> 9/18/89 (b) 1160 3775 -006 <br /> 1212789 (b) 11-57 3778 003 <br /> 4/18/90 (b) 1168 3767 -011 <br /> 10/16/90 - - - <br /> 10/19/90 1180 3755 - <br /> 1/I0/91 1164 3771 016 <br /> 4/10/91 1152 3783 012 <br /> 7/10/91 1176 3759 -024 <br /> 9/24/91 1195 3740 -019 <br /> 1/23/92 1166 3769 0.29 <br /> 4!20/92 11.56 37.79 0.10 <br /> ATR-7 <br /> 3/10/89 4965 - - - <br /> 6/21/89 1190 3775 <br /> 9/18/89 1198 3767 -008 <br /> 1212789 1194 3771 004 <br /> 4/18/90 1201 3764 -007 <br /> 10/16/90 - - - <br /> 10/19/90 12.20 3745 - <br /> 4/10/91 - - - <br /> 7/10/91 - - - <br /> 9/24/91 1234 3731 - <br /> 1n3/92 _ _ -- <br /> 4/20/92 -- -- -- <br /> ATR-8 <br /> 8/25/91 4598 - - - <br /> 9/25/91 885 3713 - <br /> 1/23/92 829 3769 056 <br /> 4/20/92 8.11 37.87 0.18 <br /> ATR-9 <br /> 10/16/90 4868 - - - <br /> 10/19/90 1111 37.57 - <br /> 1/10/91 1104 3764 007 <br /> 4/10/91 1082 3786 022 <br /> 7/10/91 1106 3762 -024 <br />