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Table 1. Water-Level Elevations <br /> ARCO Facility 2093, Tracy, California <br /> Top-of-casing Depth-to- Floating Groundwater Change since <br /> Well number elevation water Product elevation last measurement <br /> and date (feet) (a) (teet) Thickness, (feet) (feet) (feet) <br /> ATR-1 <br /> 4123187 5058 1249 _. 3809 <br /> 12/22/87 1263 -- 3795 -014 <br /> 3124188 1254 -- 38 04 009 <br /> 6/23/88 1283 3775 -029 <br /> 9129188 1301 -- 3757 -018 <br /> 2/22/89 1246 -- 38 12 055 <br /> 6/21/89 1237 -- 3821 009 <br /> 9118/89 1288 -- 3770 -051 <br /> 12/27/89 1268 - 3790 020 <br /> 4/18190 1284 -- 3774 -016 <br /> 10/16/90 <br /> 10/19/90 13 I0 3748 -026 <br /> 1110/91 1278 -- 3780 032 <br /> 4/I0191 1252 -- 38 06 026 <br /> 7/10/91 1295 37 63 -043 <br /> 9/24/91 1330 -- 3728 -035 <br /> 1123/92 1277 3781 053 <br /> 4/20192 1258 3800 019 <br /> 7/8/92 1290 -- 3768 -032 <br /> l0/7/92 1309 3749 -019 <br /> 1118/93 (b) <br /> 4/14/93 1231 -- 3827 078 <br /> 8/30/93 13 18 -- 3740 -087 <br /> 10/27/93 13 13 -- 3745 0 05 <br /> 2/18/94 1265 -- 3793 048 <br /> 5/20/94 1271 -- 3787 -006 <br /> 10/7/94 1314 -- 3744 -043 <br /> ATR-2 <br /> 4/23187 4922 1128 -- 37 94 <br /> I2/22/87 1140 -- 37 82 -0 12 <br /> 3/24/88 1135 -- 3787 005 <br /> 6/23/88 1155 -- 3767 -020 <br /> 9129188 1 1 71 37 5l -016 <br /> 2122/89 1 t 35 -- 3787 036 <br /> 6/21/89 1145 -- 3777 -0 10 <br /> 9/t8/89 1165 37 57 -020 <br /> 12/27/89 1150 -- 3772 0 15 <br /> 4/18190 1 164 3758 -0 14 <br /> 10/16/90 1181 -- 3741 -017 <br /> 10/19/90 11 81 -- 3741 000 <br /> 1/10/91 11 58 -- 3764 023 <br /> 4/l0/91 It 35 37 87 0 23 <br /> 7/10191 1174 -- 3748 -039 <br /> 9/24/91 1202 3720 -028 <br /> 1/23/92 1160 -- 3762 042 <br /> 4/20192 11 53 -- 3769 007 <br /> 7/8/92 11 75 -- 3747 -022 <br /> 10/7192 11 83 -- 37 39 -008 <br />