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Table 1. Nater-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) Jin feet <br /> SMW-1 50.24 <br /> 10/7/94 12.86 -- 37.38 -- <br /> 12/16/94 12.54 -- 37.70 0.32 <br /> < 2128195 12.40 -- 37.84 0.14 <br /> 4126195 12.71 -- 37.53 -0.31 <br /> 7127195 13.00 -- 37.24 '-0.29 <br /> 10/26/95 (d) 13.03 -- -- -0.03 <br /> 2112196 12.00 -- -- 1.03 <br /> TEX-1 (d) <br /> 10/26/95 12.86 -- -- — <br /> f 2112196 10.90 -- -- 1.96 <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 Wlc=water-level <br /> elevation corrected,WIm—water-level elevation measured,b=hydrocarbon thickness(feet), <br /> p=specific gravity(0.7)of hydrocarbon. <br /> 1 (c)Well could not be located due to parking lot repaving.; <br /> j (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-site construction activities. <br /> } (g)Unable to open well box lid. <br /> (h)Water level data collected this date probably not representative of groundwater conditions. <br /> NO'T'E: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 /> i <br /> 1 <br /> i <br /> I� <br /> 1 <br />