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Table 1. Water-Level Elevations for <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 in feet(a) in feet in feet in feet(b) in feet <br /> TEX-1 (d) <br /> 10/26/'95 1286 -- -- _. <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=Wlm +(b)(p)), where Wic=water-level <br /> elevation corrected,Wlm=water-level elevation measured, b=hydrocarbon thickness (feet), <br /> p—specitic 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 Well casing has not been resurveyed Water-level measured <br /> 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-sue construction activities <br /> (g) Unable to open well box hd <br /> (h)Water level data collected this date probably not representative of groundwater conditions <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 />