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Table I. 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 /> 1/23/92 906 3802 046 <br /> 4/20/92 900 3808 006 <br /> 7/8/92 921 3787 -021 <br /> 10f7/92 932 3776 -011 <br /> 1/18/93 832 3876 100 <br /> 4/14/93 879 3829 -047 <br /> 8/31/93 939 3769 -060 <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 to 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 />