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Table 1 Vater-Level Elevations <br /> ARCO Station 2093, Tracy, California <br /> Top-ot-Casing Depth to Floating Groundwater Change since <br /> Well No and Elevation Water Product Elevation Last Measurement <br /> date (feet) (a) (teet) Thickness,(feet) (feet) (feet) <br /> ATR-1 <br /> 4123187 5058 1249 -- 38 09 - <br /> 12/22/87 1263 -- 3795 -014 <br /> 3/24/88 1254 -- 3804 009 <br /> 6/23/88 1283 -- 37 75 -029 <br /> 9129/88 1301 -- 3757 -0 18 <br /> 2122189 1246 -- 38 12 055 <br /> 6121/89 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 -026 <br /> 1/10/91 1278 -- 37 80 032 <br /> 4/10/91 1252 -- 3806 026 <br /> 7110/91 1295 37 63 -043 <br /> 9/24/91 1330 -- 3728 -0 35 <br /> 1/23192 1277 -- 3781 053 <br /> 4120192 1258 3800 019 <br /> 718/92 1290 3768 -032 <br /> 10/7/92 1309 -- 3749 -019 <br /> 1118/93 (b) - -- <br /> 4/14/93 1231 -- 38 27 078 <br /> 8/30/93 1318 -- 3740 -087 <br /> 10/27/93 13 13 -- 3745 005 <br /> 2/18194 1265 -- 3793 048 <br /> 5/20/94 1271 -- 3787 -0.06 <br /> ATR-2 <br /> 4/23/87 4922 1128 -- 3794 - <br /> 12/22/87 1140 -- 37 82 -012 <br /> 3/24/88 1135 -- 3787 005 <br /> 6/23/88 1155 -- 3767 -020 <br /> 9/29188 1171 -- 3751 -016 <br /> 2/22189 1135 -- 3787 036 <br /> 6/21/89 1145 37 77 -010 <br /> 9118/89 1165 -- 3757 -020 <br /> 12/27/89 1150 -- 3772 0 15 <br /> 4118190 1164 -- 3758 -0 14 <br /> 10/16/90 1181 -- 3741 -0 17 <br /> 10/19/90 1181 -- 3741 000 <br /> 1110/91 1158 3764 023 <br /> 4110191 1135 -- 3787 023 <br /> 7110/91 1174 == 3748 -039 <br /> 9124191 1202 3720 -028 <br /> 1/23/92 1160 -- 3762 042 <br /> 4/20/92 1153 -- 3769 007 <br />