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Table 1. Water-Level Elevations <br /> ARCO Facility 2093, Tracy, California <br />• Top-of-casing Depth-to- Floating Water-level Change since <br /> Well number elevation water product elevation last measurement <br /> and date (feet) (a) (feet) thickness,(feet) (feet) (feet) <br /> 8/31/93 938 37 46 -0 91 <br /> 10/27/93 931 -- 3753 007 <br /> 2/18/94 8 83 38 01 0 48 <br /> 5/20/94 893 -- 3791 -010 <br /> 10/7194 934 -- 3750 -0 41 <br /> 12/16/94 891 -- 37.93 043 <br /> ATR-12 <br /> 10/16/90 47 08 -- -- -- <br /> 10/19/90 933 -- 3775 <br /> 1/10/91 9 16 -- 3792 0 17 <br /> 4/10/91 8 98 -- 38 10 018 <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 -- 38 08 006 <br /> 7/8/92 9 21 -- 3787 -0 21 <br /> 10/7/92 932 -- 3776 -011 <br /> 1/18/93 832 -- 3876 100 <br /> 4/14/93 879 -- 3829 -047 <br />• 8/31/93 939 -- 3769 -060 <br /> 10/27/93 936 -- 3772 0 03 <br /> 2/18194 902 -- 3806 034 <br /> 5/20/94 906 -- 38 02 -004 <br /> 10/7/94(f) -- -- -- -- <br /> 12n6/94(f) -- -- -- -- <br /> SMW-1 5024 <br /> 1017/94 1286 -- 3738 -- <br /> 12/16/94 1254 -- 37.70 0.32 <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 /> (f) Unable to open lid <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 />