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Table 1. Water-Level Elevations <br /> ARCO Facility 2093, Tracy, California <br /> Top-of-casing Depth-to- Floaung Groundwater Change since <br /> Well number elevation water Product elevation last measurement <br /> and date (feet) (a) (feet) Thickness, (feet) (feet) (feet) <br /> 9/24/91 1195 -- 3740 -0 19 <br /> 1/23/92 1166 -- 3769 029 <br /> 4/20/92 1156 -- 3779 0 10 <br /> 7/8/92 11 72 -- 3763 -0 16 <br /> 10/7/92 1 182 - 3753 -0 10 <br /> 1/18/93 1104 -- 38 31 078 <br /> 4/14/93 1142 3793 -038 <br /> 8/31/93 (e) <br /> 10/27/93 11 84 -- 37 51 -042 <br /> 2117/94(e) <br /> 5/20/94 (e) -- <br /> 10/7/94 1185 -- 3750 -001 <br /> ATR-7 <br /> 3/10/89 49 65 <br /> 6/21/89 1190 -- 3775 9/18/89 1198 -- 3767 -0 08 <br /> 12/27/89 1194 3771 004 <br /> 4/18/90 1201 - 37 64 -007 <br /> 10/16/90 <br /> 10/19/90 1220 -- 3745 -0 19 <br /> 4/10/917/10/91 <br /> 9/24/91 1234 -- 37 31 -0 14 <br /> 1/23/92 <br /> 4/20/92 - -- -- -- <br /> 718192 <br /> 10/7/92 1221 -- 3744 0 13 <br /> 1/18/93 11 33 -- 3832 088 <br /> 4/14/93 1175 -- 3790 -042 <br /> 8/31193 1224 -- 3741 -049 <br /> 10/27/93 1223 -- 3742 001 <br /> 2/18194 1193 -- 3772 030 <br /> 5/20194 1200 -- 3765 -007 <br /> 10/7/94 1223 3742 -023 <br /> A 1 R-8 <br /> 8125/91 4598 <br /> 9/25/91 8 85 -- 37 13 -- <br /> 1/23/92 829 -- 3769 056 <br /> 4/20192 8 11 3787 0 18 <br /> 7/8/92 848 3750 -037 <br /> 1017/92 8 69 -- 3729 -021 <br /> 1/18/93 7 09 -- 3889 160 <br /> 4/14/93 7 80 -_ 38 18 -071 <br /> 8/31/93 9 81 36 17 -201 <br />