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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 /> 4123187 5058 1249 3809 - <br /> 12/22/87 1263 3795 -014 <br /> 3/24188 1254 3804 009 <br /> 6/23188 1283 3775 -029 <br /> 9129/88 3001 2057 -17 18 <br /> 2/22/89 1246 38 12 1755 <br /> 6/21/89 1237 3821 009 <br /> 9/18/89 1288 3770 -051 <br /> 12/27/89 1269 3790 020 <br /> 4/18/90 1284 3774 -016 <br /> 10/16/90 - - ' <br /> 10/19/90 1310 3748 - <br /> 1/10/91 1278 3780 032 <br /> 4/10/91 1252 3806 026 <br /> 7110/91 1295 3763 -043 <br /> 9124191 1330 3728 -035 <br /> 1/23/92 12.77 37.81 053 <br /> ATR-2 <br /> 4/23/87 4922 1128 3794 - <br /> 12/22/87 1140 3782 -012 <br /> 3/24/88 1135 3787 005 <br /> 6/23/88 1155 3767 -020 <br /> 9/29/88 1171 3751 -016 <br /> 2/22/89 1135 3787 036 <br /> 6121/89 1145 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 1181 3741 000 <br /> 1/10/91 1158 3764 023 <br /> 4/10/91 1135 3787 023 <br /> 7/10/91 1174 3748 -039 <br /> 9/24/91 1202 3720 -029 <br /> 1123192 1L60 37.62 0.42 <br /> ATR-3 <br /> 4/23/87 4993 1179 38 14 - <br /> 12/22/87 1193 3800 -014 <br /> 3/24/88 1258 3735 -065 <br /> 6123/88 1117 38 76 141 <br /> 9/29/88 1223 3770 -106 <br />• 2122189 1182 3811 041 <br /> 6/29/89 <br />