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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 /> 4/23/87 5058 12-49 3809 - <br /> 12/22/87 12.63 3795 -014 <br /> 3/24/88 1154 38.04 009 <br /> 6/23/88 12.83 3775 -029 <br /> 9/29/88 1301 3757 -019 <br /> 2/22/89 12.46 3812 055 <br /> 6/21/89 12.37 3821 0.09 <br /> 9/18/89 12.88 3770 -051 <br /> 12J27/89 12.68 3790 020 <br /> 4/18/90 12.84 3774 -016 <br /> 10/16/90 - - - <br /> 10/19/90 13.10 37.48 - <br /> 1/10/91 12.78 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 12.77 3781 053 <br /> 4/20/92 12.58 38.00 0.19 <br /> 7/8/92 12.90 3769 -032 <br /> 10!1/92 1309 3749 -0.19 <br /> 1/18/93 (b) -- -- <br /> ATR-2 <br /> 4/23/87 4922 1128 3794 - <br /> 12/22/87 11.40 37.82 -0.12 <br /> 312A188 11.35 37.87 005 <br /> 6/23/88 111.55 37.67 -0.20 <br /> 9/29/88 11.71 37.51 -0.16 <br /> 2/=9 11.35 37.87 0.36 <br /> 6/21/89 11.45 37.77 -0.10 <br /> 9/18/89 11.65 37.57 -0.20 <br /> 12/27/89 1150 3772 0.15 <br /> 4/18/90 11.64 37.58 -0.14 <br /> 10/16/90 1181 37.41 -0.17 <br /> 10/19/90 11.81 3741 0.00 <br /> 1/10/91 11.58 3764 023 <br /> 4/10/91 1135 37.87 0.23 <br /> 7/10/91 11.74 3748 -0.39 <br /> 9/24/91 12.02 37.20 -028 <br /> 1/23/92 11.60 37.62 0.42 <br /> 4/20/92 11.53 3769 0.07 <br /> 7/8/92 1175 37.47 -0.22 <br /> 10/7/92 11.83 3739 -0.08 <br /> 1/18193(b) -- - -- <br />