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Table 1. Water-Level Elevations <br /> ARCO Facility 2093, Tracy, California <br />• Tap-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 teet 3n feet(b) in feet <br /> 1/23/92 906 -- 3802 046 <br /> 4/20/92 900 -- 3808 006 <br /> 7/8/92 921 -- 37 87 -021 <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 003 <br /> 2/18/94 902 -- 3806 034 <br /> 5/20/94 906 -- 3802 -004 <br /> 10/7/94(g) -- -- --12/16/94(g) -- -- -- -- <br /> 2/28/95(g) -- -- -- -- <br /> 4/26/95(g) -- -- -- -- <br /> SMW-1 5024 <br /> 10/7/94 1286 -- 3738 -- <br /> 12/16/94 1254 -- 3770 032 <br /> 2/28/95 1240 -- 3784 014 <br />• 4/26/95 12.71 -- 37.53 -0.31 <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 /> (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 /> been 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 lid <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 /> convections should not change any previous contour maps <br />