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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 /> ATR-6 <br /> 3/10/89 4935 - <br /> 6/21/89 (b) t 1 54 3781 - <br /> 9/18/89 (b) 1160 3775 -006 <br /> 12/27/89 (b) 1157 3778 003 <br /> 4/18/90 (b) 1168 3767 -011 <br /> 10/16/90 - - - <br /> 10/19/90 1180 3755 - <br /> 1/l0/91 1164 3771 016 <br /> 4/10/91 1152 3783 012 <br /> 7/10/91 1176 37 59 -024 <br /> 9124/91 1195 3740 -019 <br /> 1/23192 1L66 3769 0.29 <br /> ATR-7 <br /> 3/10/89 4965 - - - <br /> 6/21/89 1190 3775 - <br /> 9/18/89 1198 3767 -008 <br /> 12/27/89 1194 3771 004 <br /> 4/18/90 1201 3764 -007 <br /> 10/16/90 <br /> 10/19/90 1220 3745 - <br /> 4/10/91 _ - _ <br /> 7/10/91 - - _ <br /> 9/24/91 1234 3731 - <br /> 1123192 -- -- -- <br /> ATR-8 <br /> 8/25/91 4598 <br /> 9/25/91 885 37 13 - <br /> 1/23/92 829 37.69 0.56 <br /> ATR-9 <br /> 10/16/90 4868 - - - <br /> 10/19/90 11 11 3757 - <br /> 1/10/91 1104 3764 007 <br /> 4/10/91 1082 3786 022 <br /> 7/10/91 1106 3762 -024 <br /> 9/24/91 1129 3739 -023 <br /> 1/23192 10.96 3772 0.33 <br /> ATR-10 <br /> 10/16/90 4807 - - - <br /> 10/19/90 1020 3787 - <br /> 1110/91 1007 3800 013 <br /> 4/10/91 1000 3807 007 <br />