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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 thickness elevation, last measurement, <br /> and date to feet(a) in feet in feet in feet(b) in feet <br /> 12/16/94(g) <br /> 2/28/95(g) -- -- -- -- <br /> SMW-1 5024 <br /> 1017194 1286 -- 3738 -- <br /> 12/16/94 1254 -- 3770 032 <br /> 2/28/95 12.40 -- 3784 0.14 <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)Corrected water level elevation value(Wlc—WIm+(b)(p)), where WIc—water-level <br /> elevation corrected,Wlm-•water-level elevation measured, b=hydrocarbon thickness(feet), <br /> p—specific gravity (0 7)of hydrocarbon <br /> (c) Well could not be located due to recent parking lot repaving <br /> (d)Top of well casing altered during conversion to soil vapor extraction well Well casing has not <br /> resurveyed Water-level measured from the highest point of well casing <br /> (e) Depth-to-water for these dates reported incorrectly in quarterly reports <br /> for October 1990 through July 1991 <br /> (f)Well was inaccessible due to on-site construction activities <br /> (g) Unable to open well box Iid <br /> NOTE The water level elevations in this report cannot be compared with any reports <br /> pnor to March 1991 due to the correction to the arbitrary datum However,these <br /> corrections should not change any previous contour maps <br />