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'fable 1. Water-Level Elevations <br /> ARCO Station 2093,Tracy,California(cont'd) <br /> Top-of-Casing Depth to Groundwater Change since <br /> Well No.and Elevation Water Elevation last Measurement <br /> date <br /> (feet) a !feet) feet) (feet) <br /> ATR-12 <br /> 10116190 47.08 <br /> 9/90 933 37.75 <br /> 1011 <br /> 1/101919/9 9.16 37.92 0.17 <br /> 4/10191 8.98 38.10 0.18 <br /> 12191 9.28 37.80 -0.30 <br /> 719174/91 9.52 37.56 -0.24 <br /> (a)All elevations have been corrected to an a tiitrary datum based on a <br /> temporary on-site benchmark with an assigned elevation of 50 feet. <br /> (b)Depth to water for these dates reported inch rectiy in quarterly reports <br /> for October 1990 through July 1991. <br /> NOTE:The watrr level elevations in this repon can not be compared with any reports prior to <br /> March 1991 due to the correction to the arbitrary datum,However these corrections should not <br /> change any previous contour maps. <br /> Table 2. Groundwater Flow Direction end Gradient, <br /> ARCO Station 2093,Tracy,California <br /> Flaw Average hydraulic <br /> Date direction radient <br /> 4/23/87 -- r <br /> r 12/22187 <br /> 3/24/88 — r <br /> 6123/88 N 0.2 <br /> 9129188 N 0.2 <br /> 2RI/89 NE 0.2 <br /> 6/21/89 NE 0.2 <br /> 9118189 N 0.2 <br /> 12/27189 E <br /> 4118140 NE 0.01 <br /> 10/16x90 <br /> 10/19/90 <br /> 1110191 NE 0.01 <br /> 4/10191 NE 0.01 <br /> 7110/91 NE 0.002 <br /> 9124191 N 0.002 <br />