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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (continued) <br /> Top-ot-Casing Depth to Groundwater Change since <br /> Well No and Elevation Water Elevation Last Measurement <br /> date (teet)(a) (feet) (feet) (feet) <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 /> 9/24191 1032 3775 -011 <br /> 1/23/92 1000 3807 032 <br /> 4/20/92 1001 3806 -001 <br /> 718192 1017 3790 -016 <br /> 10/7/92 1023 3784 -006 <br /> ATR-11 <br /> 8/25/91 4684 - - - <br /> 9/24/91 950 3734 - <br /> 1/23/92 995 3789 055 <br /> 4/20192 878 3806 017 <br /> 7/8/92 912 3772 -034 <br /> ion/92 930 3754 -018 <br /> ATR-12 - <br /> 10/16/90 4708 <br /> 10/19/90 933 3775 <br /> 1/10191 9 16 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 /> 4/20/92 900 3808 006 <br /> 718192 921 3787 -021 <br /> 10n/92 932 3776 -011 <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 in quarterly reports <br /> for October 1990 through July 1991 <br /> NOTE The water level elevations to this report cannot be compared with any reports prior to <br /> March 1991 due to the correction to the arbitrary datum However,these corrections should not <br /> change any previous contour maps <br />