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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (continued) <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-11 <br /> 8/25/91 4684 - - <br /> 9/24/91 950 3734 - <br /> 1/23/92 895 3789 055 <br /> 4/20192 878 3806 017 <br /> 7/8/92 912 3772 -034 <br /> 10/7/92 930 3754 -018 <br /> 1/18/93 780 3904 150 <br /> 4/14/93 847 3837 -0.67 <br /> ATR-12 <br /> 10/16/90 4708 - - - <br /> 10/19/90 933 3775 - <br /> 1/10/91 916 3792 017 <br /> 4110191 898 38 10 018 <br /> 7/12/91 928 3780 -030 <br /> 9124191 952 3756 -024 <br /> 1/23/92 906 3802 046 <br /> 4/20/92 900 3808 006 <br /> 7/8/92 921 3787 -021 <br /> 1017192 932 37-76 -011 <br /> 1118/93 832 3876 100 <br /> 4/14193 879 38.29 -0.47 <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)Well could not be located due to recent parking lot repaving <br /> (c)Depth to water for these dates reported incorrectly in quarterly reports <br /> for October 1990 through July 1991 <br /> NOTE The water level elevations En this report cannot be compared with any reports <br /> prior to March 1991 due to the correction to the arbitrary datum However,these <br /> corrections should not change any previous contour maps <br />