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Groundwater Elevation Difference/Middle of Screen Interval Difference = Vertical Gradient(foottfoot) <br /> Vertical Gradient <br /> Well io (foot/foot) <br /> Jan 5, April 5, July 14, Oct 6, Jan 19, Apr 10, Jul 12, <br /> 1999 1999 1999 1999 1 2000 2000 2000 AVERAGE <br /> M01B <br /> M01A -0.0715 -0.0818 -0.0009 -0.0005 -0.0011 -0.0019 -0.026283 <br /> M028 • <br /> M02A -0.0011 -0.0009 -0.0057 -0.0014 0 -0.002 -0.001829 <br /> M05B <br /> M05A 0.00013 -0.0022 -0.0011 -0.0008 -0.0012 -0.0019 -0.0016 -0.001233 <br /> M768 <br /> M16A -0.0037 -0.0083 -0.0046 -0.0032 -0.0101 -0.0087 -0.006441 <br /> The vertical gradients between the B-and A-aquifers in the vicinity of 233 Parallel Avenue predominantly <br /> exhibit a slight downward hydraulic gradient. With the exception of the April 5 and July 14, 1999 <br /> measurements in the M-01 B/A pair, all of the water level differences between the B-and A-aquifers were <br /> less than one foot. The average vertical gradients vary from -0.026 to-0.001 foot/foot. with the flattest <br /> average gradient occurring at well pair M-05B/A, which is closest to the 233 Parallel Avenue well. <br />