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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California <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-1 <br /> 4/23/87 5058 1249 3809 - <br /> 12/22/87 1263 3795 -014 <br /> 3/24/98 12.54 38.04 009 <br /> 6123/88 12.83 3775 -029 <br /> 9/29/88 1301 3757 -018 <br /> 2122/89 1246 3812 0.55 <br /> 6/21/89 1237 3921 009 <br /> 9/18/89 1288 3770 -0.51 <br /> 12J27/89 1268 3790 020 <br /> 4/18/90 1284 3774 -016 <br /> 10/16/90 - - - <br /> 10/19/90 1310 3748 - <br /> 1110/91 1278 3780 032 <br /> 4110/91 1252 3806 026 <br /> 7/10/91 1295 3763 -043 <br /> 9/24/91 1330 37.28 -035 <br /> 1/23/92 1277 3781 053 <br /> 4/20192 12.58 38.00 0.19 <br /> ATR-2 <br /> 4/23/87 4922 1128 3794 - <br /> 12/22/87 1140 3782 -012 <br /> 3124/88 1135 3787 005 <br /> 6/23/88 1155 3767 -020 <br /> 9129/88 1171 3751 -016 <br /> 2/22/89 1135 3787 036 <br /> 6/21/89 1145 3777 -010 <br /> 9/18/89 1165 3757 -020 <br /> 12/27/89 11.50 37.72 015 <br /> 4/18/90 1164 37.58 -014 <br /> 10/16/90 1181 3741 -017 <br /> 10/19/90 1181 37.41 000 <br /> 1/10/91 1158 3764 0.23 <br /> 4/10/91 1135 3787 023 <br /> 7/10/91 1174 3748 -039 <br /> 9/24/91 1202 3720 -028 <br /> 1/23/92 1160 3762 042 <br /> 4120/92 1L53 37.69 0.07 <br /> ATR-3 <br /> 4123/87 4993 1179 3914 - <br /> 12/=7 1193 3800 -014 <br /> 3/24/88 1258 3735 -065 <br /> 6/2`3/88 1117 3876 141 <br />�� 9/29/88 1223 3770 -106 <br />