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' Attachment E <br /> WATER VELOCITY CALCULATION <br /> ' Ground-water elevations in the monitoring wells were obtained on <br /> August 3, 1992. These measurements were used to define the direction <br /> and gradient of ground-water flow in the vicinity of the Harney Lane Sani- <br /> tary Landfill. The ground-water flow direction in this area is toward the <br /> southwest. The average ground-water velocity in this area was calculated <br /> using the following equation (Darcy's Law): <br /> V= Ki <br /> n <br /> Where V= maximum linear velocity <br /> K=permeability <br /> i = hydraulic gradient <br /> n = porosity <br /> The values used to solve the above equation are as follows: <br /> K=9.0 x 10-3 centimeters per second (cm/sec) <br /> i =0.000122 <br /> n =0.30 <br /> The permeability coefficient was determined by a slug test conducted in <br /> well G-1 at North County Sanitary Landfill (located approximately 1 mile <br /> from the site) to be 9.0 x 10-3 cm/sec. Well G-1 at North County Sanitary <br /> Landfill monitors similar soil types at the equivalent stratigraphic horizon <br /> as the water-bearing zone beneath the Harney Lane Sanitary Landfill. The <br /> ' hydraulic gradient was calculated by dividing the difference in <br /> ground-water elevations between contour lines -21 and -31 by the dis- <br /> tance between the lines (2,450 feet) measured in the direction of <br /> PJ9\939\9390111 c E - 1 Rev. 0 September 9, 1992 <br />