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The purpose of the splitter embankment is to reduce the <br />• rate of rise of tailings in the lower portions of the disposal <br />area. The embankment will be constructed using 2H:1V side <br />slopes since this is a temporary structure which will <br />eventually be buried within the tailings. The stability of the <br />splitter embankment was not evaluated since it has no effect <br />on the stability of the disposal area as a whale. ' <br />Ramps sloping at 5H:1V will be constructed from the crest <br />of the splitter embankment to the bottom of the upper and 1 ower <br />disposal areas. These ramps will be used for access to skid <br />mounted pump stations for return of water from the free water <br />pool to the milling process. <br />The entire splitter embankment and access ramps will be <br />constructed of relatively low permeability materials. A three <br />foot thick layer of pervious material will underlie the <br />embankment to serve as liner protection and for routing of <br />• the disposal area drainage network. <br />D.6.5.4.3 Perimeter Embankments <br />Two perimeter embankments will be necessary to ensure <br />complete containment of the tailings and design storm as well <br />as aiding in diversion of flows from Drainage Area D. Perimeter <br />embankments will be constructed on the north aed east sides <br />of the tailings disposal areas and are referred to as the North <br />Dike and East Dike, respectively. These dikes will be <br />constructed with side slopes of 3H:1V. The North Dike will be <br />approximately 10 feet in height with a crest width of 30 feet. <br />The East Dike will be approximately 15 feet in (height with a <br />crest width of 20 feet. The embankments will be constructed <br />with locally available material. The internal slopes of this <br />embankment will be lined with a 40-mil VLDPE liner material. <br />n <br />U <br />D-3.7 <br />