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Table I Water-Level Elevations <br /> ARCO Station 2093, Tracy, California <br /> Top-of-Casing Depth to Floating Groundwater Change since <br /> Well No and Elevation Water Product Elevation Last Measurement <br /> date (feet) (a) (feet) Thickness, (feet) (feet) (feet) <br /> ATR-1 <br /> 4/23187 5058 1249 -- 3809 - <br /> 12/22/87 1263 - 37 95 -014 <br /> 3/24/88 1254 3804 009 <br /> 6/23/88 1283 - 3775 -029 <br /> 9/29/88 1301 - 3757 -0 18 <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 -0 16 <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 13 30 -- 3728 -035 <br /> 1/23/92 1277 -- 37 81 053 <br /> 4120/92 1258 -- 3800 0 19 <br /> 7/8192 1290 3768 -032 <br /> 10/7/92 1309 3749 -0 l9 <br /> 1/18/93 (b) -- -- -- -- <br /> 4/I4/93 1231 -- 3827 -- <br /> 8/30/93 13 18 -- 3740 -087 <br /> 10/27/93 13 13 3745 005 <br /> 2/18/94 1265 -- 3793 048 <br /> ATR-2 <br /> 4/23/87 4922 1128 -- 3794 - <br /> 12/22/87 1140 -- 3782 -012 <br /> 3/24/88 11 35 -- 3787 005 <br /> 6/23/88 1 155 -- 3767 -020 <br /> 9/29/88 1171 -- 3751 -0 16 <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 1150 -- 3772 015 <br /> 4/18/90 1164 3758 -014 <br /> 10/16/90 1181 -- 3741 -0 17 <br /> 10/19/90 1 l 81 -- 3741 000 <br /> 1110191 1158 - 3764 023 <br /> 4114/91 1135 -- 3787 023 <br /> 7110191 1174 37 48 -039 <br /> 9/24191 1202 3720 -028 <br /> 1/23/92 1160 -- 3762 042 <br />