Laserfiche WebLink
' unexpected and probably indicates ground-water mounding to the north and east in the <br /> area around the California Aquaduct and Delta-Mendota canal complex. Additional <br /> water level measurements are required to confirm this flow direction as there may be <br /> significant seasonal variation. <br /> ' The dee regional p eg onal aquifer is overlain by approximately 200 feet of unsaturated low <br /> permeability sediments (see Drawing 2 and 3). These sediments would restrict vertical <br /> infiltration of ground water from the shallow perched aquifer in the Corcoran Clay. The <br /> ' ground-water contour map(Drawing 5) shows that the principal direction of recharge to <br /> the deep regional aquifer is primarily from the valley. <br /> No springs occur at the disposal site or within 1 mile of the site perimeter. <br /> 2.5 ON-SITE PERMEABILITY <br /> 2.5.1 Ground water Gradient and Velocity <br /> Ground water moving beneath the site within the deep regional aquifer flows to the <br /> southeast toward Corral Hollow Creek (see Drawing 5). Ground water in the shallow <br /> ' perched aquifer appears to be mounded near Monitoring Well SB-1 and appears to flow <br /> both to the northwest, and southeast. The flow directions in both water-bearing <br /> zones were determined from ground-water contour maps (Drawings 4 and 5), <br /> constructed from water levels ineasured in June 1988. <br /> ' The average flow velocity (V)was calculated using the following form of Darcy's Law: <br /> ' V=ki/n <br /> ' where: V=Velocity <br /> k=hydraulic conductivity(cm/sec) <br /> ' i=hydraulic gradient <br /> n=porosity (%) <br /> 1 The calculated ground-water gradient (i) for the deep regional water-bearing zone is <br /> STL 9390314 11 Re.no <br />