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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy,California(cont'd) <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 /> 1/23/92 1096 3772 033 <br /> 4/20/92 1088 3780 008 <br /> 7/8/92 1L06 37.62 -0.18 <br /> ATR-10 <br /> 10/16/90 4807 - - . <br /> 10/19/90 10.20 3787 - <br /> 1/10/91 1007 3800 013 <br /> 4/10/91 1000 3807 007 <br /> 7/12/91 10.21 3786 -0.21 <br /> 9/24/91 1032 3775 -011 <br /> 1/23/92 1000 3807 032 <br /> 4/20/92 1001 3806 -001 <br /> 7/8/92 10.17 37.90 -0.16 <br /> ATR-11 <br /> 8/25/91 4684 - - - <br /> 9/24/91 950 3734 - <br /> 1/23/92 895 3789 0.55 <br /> 4/20/92 878 3806 017 <br /> 7/8192 9.12 37.72 -0.34 <br /> ATR-12 <br /> 10/16/90 4708 - - - <br /> 10/19/90 933 3775 - <br /> 1/10/91 916 3792 0.17 <br /> 4/10/91 898 3810 018 <br /> 7/12/91 9.28 37.80 -030 <br /> 9/24191 9.52 3756 -0.24 <br /> 1123/92 906 3802 046 <br /> 4/20/92 900 3808 006 <br /> 7/8192 9.21 37.87 4021 <br /> (a)All elevations have been corrected to an arbitrary datum bused on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet. <br /> (b)Depth to water for these dates reported mcorrectly in quarterly reports <br /> for October 1990 through July 1991. <br /> NOTE.The water level elevations to this report cannot be compared vnnth any reports prior to <br /> Manch 1991 due to the correction to the arbitrary datum However,these corrections should not <br /> change any previous contour maps <br />