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Table 1. Water-Level Elevations for ARCO Facility 2093, Tracy, California Top-of-casing Depth-to- Floating Water-level Change since Well number elevation, water, product thickness elevation, last measurement and date in feet(a) in feet in feet in feet(b) in feet 10/7/94 (g) -- -- -- __ 12/16/94(g) -- -- -- -- 2/28/95(g) -- -- __ 4126/95 (g) -- -- -- -- 7/27/95 (g) t 0/26/95 (g) -- -- -- -- 2/12/96 885 3823 021 4/18/96 922 -- 3786 -037 7/18/96 953 3755 -031 SMW-1 5024 10/7/94 1286 -- 3738 -- 12/16/94 1254 -- 3770 032 2/28/95 1240 -- 3784 014 4/26/95 1271 -- 3753 -031 7/27/95 1300 -- 3724 -029 I0/26/95 (d) 1303 -- -- -003 2/12/96 1200 -- -- 1 03 4/18196 1258 -- -- -058 7/18/96 12.85 -- -- -027 TEX-1 (d) 10/26/95 1286 -- --2/12/96 1090 -- -- 1 96 4/18/96 11 35 -- -- -045 7/18196 1152 -- -- 134 (a)All elevations corrected to an arbitrary datum based on a temporary on-site benchmark with an assigned elevation of 50 feet (b)Corrected water level elevation value(Wlc=Wlm+(b)(p)),where Wlc=water-level elevation corrected, Wlm=water-level elevation measured, b=hydrocarbon thickness(feet), p=specific gravity(0 7)of hydrocarbon (c)Well could not be located due to parking lot repaving (d)Top of well casing altered Well casing has not been resurveyed Water-level measured from the highest point of well casing (e) Depth-to-water for these dates reported incorrectly in quarterly reports for October 1990 through July 1991 (f)Well was inaccessible due to on-site construction activities (g)Unable to open well box lid (h) Water level data collected this date probably not representative of groundwater conditions NOTE The water level elevations in this report cannot be compared with any reports prior to March 1991 due to the correction to the arbitrary datum However,these corrections should not change any previous contour maps 33151TAB1,ES12093AUG6 XLS