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Table 1. Water-Leel Elevations for <br /> ARCO Facility 2093, Tracy, California <br /> Top-of-casing Depth-to- Floating I Water-level Change since <br /> Well number elevation, water, product thickness elevation, last measurement <br /> and date in feet(a) in feet in teet in feet(b) in feet <br /> ATR-12 <br /> 10/16/90 4708 <br /> 10/19/90 933 - 3775 -- <br /> 1/10/91 9 16 -- 3792 0 17 <br /> 4/10/91 898 38 10 0 18 <br /> 7/12/91 928 -- 3780 -030 <br /> 9124/91 9 52 -- 3756 -024 <br /> 1/23/92 906 -- 3802 046 <br /> 4/20/92 900 3808 006 <br /> 7/8192 921 - 3787 -021 <br /> 10/7192 932 -- 3776 -0 1 1 <br /> 1118/93 8 32 -- 3876 100 <br /> 4/14/93 879 - 38 29 -047 <br /> 8/31/93 939 -- 3769 -060 <br /> 10/27/93 936 - 3772 003 <br /> 2/18/94 902 -- 3806 034 <br /> 5/20194 906 -- 3802 -004 <br /> 10/7/94(g) <br /> 12/16/94 <br /> 2/28/95 (g) <br /> 4/26195 (g) -- <br /> 7/27/95 (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 /> 4126/95 1271 -- 3753 -031 <br /> 7/27/95 1300 -- 37.24 -029 <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 (Wle—Wim+(b)(p)), where Wle—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 ltd <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 />