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Table 1. Vater-Level Elevations <br /> ARCO Station 2093,Tracy, California <br /> Top-ot-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 /> 3/24/88 1254 3804 009 <br /> 6123/88 1283 3775 -029 <br /> 9/29/88 1301 3757 -018 <br /> 2/22/89 1246 38 12 055 <br /> 6/21/89 1237 3821 009 <br /> 9/18/89 1288 3770 -051 <br /> 12/27/89 1268 3790 020 <br /> 4/18/90 1284 3774 -016 <br /> 10/16/90 - - - <br /> 10/19/90 13 10 3748 - <br /> 1/10/91 1278 3780 032 <br /> 4/10/91 1252 3806 026 <br /> 7/10/91 1295 3763 -043 <br /> 9/24/91 1330 3728 -035 <br /> 1/23/92 1277 3781 053 <br /> 4120192 12 58 3800 019 <br /> 7/8/92 1290 3768 -032 <br /> 10!7/92 1309 3749 -019 <br /> ATR-2 <br /> 4/23/87 4922 11 28 3794 <br /> 12/22/87 11 40 3782 -012 <br /> 3/24/88 11 35 3787 005 <br /> 6/23/88 1155 3767 -020 <br /> 9/29/88 1171 3751 -016 <br /> 2/22/89 11 35 3787 036 <br /> 6/21/89 11 45 3777 -010 <br /> 9/18/89 1165 3757 -020 <br /> 12/27/89 1150 3772 015 <br /> 4/18/90 1164 3758 -014 <br /> 10/16/90 11 81 3741 -017 <br /> 10/19/90 11 81 3741 000 <br /> 1/10191 1158 3764 023 <br /> 4/10/91 11 35 3787 023 <br /> 7110/91 11 74 3748 -039 <br /> 9124/91 1202 3720 -028 <br /> 1/23/92 1160 3762 042 <br /> 4/20/92 11 53 3769 007 <br /> 7/8/92 1175 3747 -022 <br /> 10!1/92 1183 3739 -008 <br /> ATR-3 <br /> 4/23/87 4993 11 79 38 14 - <br /> 12/22/87 1 1 93 3800 -014 <br /> 3124/88 1258 3735 -065 <br /> 6/23/88 11 17 3876 1 41 <br /> 9/29/88 1223 3770 -106 <br /> 2/22/89 1 1 82 38 11 041 <br /> 6/29/89 - - - <br /> s <br />