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Table 2. Groundwater Flow Direction and Gradient, <br /> ARCO Facility 2093, Tracy, California <br /> Approximate Approximate <br /> flow hydraulic <br /> Date direction gradient <br /> 6123188 N 0 002 <br /> 9129/88 N 0 002 <br /> 2/22/89 NE 0 002 <br /> 6/21/89 NE 0 002 <br /> 9/18/89 N 0 002 <br /> 12/27/89 E <br /> 4/18/90 NE 0 001 <br /> 1/10/91 NE 0 002 <br /> 4/10/91 NE 0 003 <br /> 7/10/91 NE 0 002 <br /> 9/24/91 N 0 002 <br /> 1/23/92 N 0 002 <br /> 4120/92 NE 0 003 <br /> 7/8/92 N-NE 0 002 <br /> 10/7/92 NNE 0 002 <br /> 1/18/93 ESE(a) 0 004 <br /> 4114193 N 0 003 <br /> 8/30/93 N 0 003 <br /> 10/27/93 N-NE 0 003 <br /> 2/17/94 NE 0 002 <br /> 5/20194 NE 0 001 <br /> 10/7/94 NE 0 003 <br /> 12/16/94 NE 0 002 <br /> 2/28/95 NE 0 002 <br /> (a) Incorrectly reported as WNW in <br /> 1st quarter 1993 report (April 26, 1993) <br />