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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 /> 4/10/91 898 38 10 018 <br /> 7/12/91 928 3780 -030 <br /> 9/24/91 952 3756 -024 <br /> 1/23192 906 3802 046 <br /> 4/20/92 900 3808 006 <br /> 718192 921 3787 -021 <br /> 10/7/92 932 3776 -011 <br /> 1/18/93 832 3876 100 <br /> 4114/93 879 3829 -047 <br /> 8131/93 939 3769 -060 <br /> 10/27/93 936 3772 003 <br /> (a) All elevations have been corrected to an arbitrary datum based on a <br /> temporary on-site benchmark witli an assigned clevatiou of 50 feet <br /> (b) Wcll could not be located due to recent parking lot rt-paving <br /> (c) 'lop of casing well has been damaged Water-1t,vel mi,asured from the <br /> 111gliest point of well CdSinb <br /> (d) Depdi to water for tlleSL 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 Ifowever, these <br /> corrections should not change any previous contour maps <br />