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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 (feet) (a) (feet) (feet) (teet) <br /> ATR-3 <br /> 4123187 4993 1179 38 14 - <br /> 12/22/87 1193 3800 -014 <br /> 3/24/88 1258 3735 -065 <br /> 6/23/88 11 17 3876 1 41 <br /> 9/29/88 1223 3770 -106 <br /> 2/22/89 11 82 3811 041 <br /> 6129189 - - - <br /> 9/18/89 1219 3774 - <br /> 12/28/89 1201 3792 0 18 <br /> 4/18/90 12 15 3778 -0 14 <br /> 10/16/90 1235 3758 -020 <br /> 10/19/90 1228 3765 007 <br /> 1/10/91 1201 3792 027 <br /> 4/10/91 11 82 38 11 019 <br /> 7110191 1223 3770 -041 <br /> 9124/91 1257 3736 -034 <br /> 1/23/92 1212 3781 045 <br /> 4/20/92 1193 3800 0 t9 <br /> 718/92 1222 3771 -029 <br /> 10/7/92 1238 3755 -016 <br /> 1/18/93 1122 3871 1 16 <br /> 4/14193 11.49 3944 -027 <br /> ATR-4 <br /> 4123/87 4903 1085 38 18 - <br /> 12/22/87 1100 3803 -015 <br /> 3/24188 1098 3805 002 <br /> 6/23/88 1211 3692 -1 13 <br /> 9/29188 1072 3831 1 39 <br /> 2122/89 1091 3812 -019 <br /> 6/29/89 1100 3803 -009 <br /> 9/18/89 11 19 3784 -019 <br /> 12/28/89 1108 3795 Oil <br /> 4/18/90 1125 3778 -017 <br /> 10/16/90 1138 3765 -0 13 <br /> 1110/91 11 16 3787 022 <br /> 4/10/91 1099 3804 0 17 <br /> 7/10191 1132 3771 -033 <br /> 9124/91 1157 3746 -025 <br /> 1/23/92 11 16 3787 041 <br /> 4120/92 11 12 3791 004 <br /> 7/8/92 11 31 3772 -019 <br /> 10/7/92 1145 3758 -014 <br /> 1/18/93 1045 3858 100 <br /> 4/14/93 1087 3816 -042 <br />