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.*t <br /> Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California(cont'd) <br /> Top-of-Casing Depth to Groundwater Change smce <br /> Well No and Elevation Water Elevation Last Measurement <br /> date feet a feet feet feet <br /> 9/24/91 11.29 3739 -023 <br /> 1/23/92 1096 3772 033 <br /> 4120/92 10.88 37.80 0.08 <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 1021 3786 -021 <br /> 9/24/91 1032 3775 -011 <br /> 1/23/92 1000 3807 032 <br /> 4/20192 1001 38.06 -0.01 <br /> ATR-11 <br /> 8/25/91 4694 - - - <br /> 9/24/91 950 3734 - <br /> 1/23/92 895 3789 0.55 <br /> 4/20/92 8.78 38.06 0.17 <br /> ATR-12 _ _ - <br /> 10/16/90 4708 <br /> 10/19/90 933 3775 - <br /> 1/10/91 916 3792 017 <br /> 4/10/91 898 3810 018 <br /> 7/12/91 928 3780 -030 <br /> 9/24/91 952 3756 -024 <br /> 1/23/92 906 3802 046 <br /> 4120/92 9.00 38.08 0.06 <br /> (a)All elevations have been corrected to an arbitrary datum based on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet <br /> (b)Depth to water for these dates reported incorrectly m quarterly reports <br /> for October 1990 through July 1991 <br /> NOTE.The water level elevations m this report cannot be compared with any reports pnor to <br /> March 1991 due to the correction to the arbitrary datum However,these correcuons should not <br /> change any previous contour maps <br />