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Table 1. Water-Level Elevations <br /> ARCO Station 2093, Tracy, California (cont'd) <br /> Top-of-Castng Depth to Floating Groundwater Change since <br /> Well No and Elevation Water Product Elevation last Measurement <br /> date (feet) (a) (feet) Thickness, (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 /> 4/20/92 878 -- 3806 0 17 <br /> 7/8/92 9 12 -- 3772 -034 <br /> 10/7/92 930 -- 3754 -018 <br /> 1/18/93 780 3904 1 50 <br /> 4/14/93 847 -- 3837 -067 <br /> 8/31/93 938 3746 -091 <br /> 10/27/93 931 -- 3753 007 <br /> 2/18/94 883 -- 3801 048 <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 38 10 0 18 <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 /> 7/8/92 921 -- 3787 -021 <br /> 10/7/92 932 -- 3776 -0 I 1 <br /> 1/18/93 832 3876 100 <br /> 4/14/93 879 -- 3829 -047 <br /> 8/31/93 939 -- 3769 -060 <br /> 10/27/93 936 -- 3772 003 <br /> 2/18/94 902 -- 3806 034 <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)Top of casing well has been damaged Water-level measured from the <br /> highest point of well casing <br /> (d) Depth to water for these dates reported incorrectly in quarterly reports <br /> for October 1990 through July 1991 <br /> (e) Well was inaccessible due to on-site construction activities <br /> NOTE The water level elevations in 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 />