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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (continued) <br /> Top-ot-Casing Depth to Groundwater Change since <br /> Well No and Elevation Water Elevation Last Measurement <br /> date (teet) (a) (feet) (feet) (feet) <br /> ATR-6 <br /> 3110189 4935 - - - <br /> 6121189 (b) 11 54 37 81 - <br /> 9/18/89 (b) 11 60 3775 -006 <br /> 12/27/89 (b) 11 57 3778 003 <br /> 4118190 (b) I 1 68 37 67 -0 11 <br /> 10/16/90 - - - <br /> 10/19/90 11 80 3755 - <br /> 1/10/91 1 1 64 3771 016 <br /> 4110191 11 52 3783 012 <br /> 711019 t 1176 3759 -024 <br /> 9/24/91 1195 37 40 -019 <br /> 1123192 11 66 3769 029 <br /> 4120192 11 56 3779 010 <br /> 718192 11 72 3763 -016 <br /> 10/7/92 1182 3753 -010 <br /> ATR-7 <br /> 3110189 4965 - - <br /> 6/21/89 1190 3775 - <br /> 9118/89 1198 3767 -008 <br /> 12/27/89 1194 3771 004 <br /> 4/18/90 12 01 37 64 -0 07 <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 /> 1/23/92 '- -- -- <br /> 4120/92 -- -- <br /> 7/8192 -- <br /> 10/7192 1221 3744 '- <br /> ATR-8 <br /> 8125/91 4598 - - <br /> 9/25/91 885 3713 - <br /> 1/23/92 829 3769 056 <br /> 4/20/92 8 11 3787 018 <br /> 7/8192 848 3750 -037 <br /> 10!1/92 8.69 37.29 -021 <br /> ATR-9 <br /> 10/16/90 4868 - - - <br /> 10/19/90 11 11 3757 - <br /> 1/10/91 l104 3764 007 <br /> 4/10191 1082 3786 022 <br /> 7/10/91 1106 37 62 -024 <br /> 40 9124/91 1129 3739 -023 <br /> 1/23/92 1096 3772 033 <br /> 4120/92 1088 3780 008 <br /> 718/92 1106 37 62 -019 <br /> 10/7/92 11.16 3752 -010 <br />