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D.6.5.4.1 Main Embankment <br />~~ . •. <br />` The main embankment has been designed as a zoned <br />earthfill which will be constructed in three stages. <br />During Phase 1 of the operations, the embankment will <br />be raised to an elevation of 8,590 feet. Out:slopes will° be <br />3H:1V on the downgradient side and 2.5H:1V on the upgradient <br />side. The downgradient side has been designed at 3H:1V to allow <br />concurrent reclamation and will be revegetated upon completion <br />of construction as discussed in Exhibit E. The Phase 1 <br />embankment will have a crest length of 1,450 feet. A 30 foot <br />wide road will be constructed on the crest for tailings <br />distribution lines and an access road. In addition to the <br />access roads, a bench will be constructed at an elevation of <br />8,550 feet on the upgradient side of the Phase 1 embankment. <br />the bench will be used for initial tailings distribution. <br />_ During Phase 2 of operations two additional raises will <br />be constructed on the upgradient side of the main embankment. <br />The raises will occur when the tailings elevations reach 8,582 <br />feet and 8,600 feet. Construction of the raises will occur to <br />provide that sufficient freeboard is available within the <br />disposal area to contain stormwater inflows resulting from the <br />probable maximum rainfall (PMF). Raises will be of an upstream <br />construction type and will be placed on dewatered, consolidated <br />tailings. The results of the deposition ma~delling and <br />desiccation analyses indicate that the Phase 2 construction <br />over the shallow depth of tailings will be viable. Confirmation <br />of the physical properties and suitability of the tailings will <br />be obtained prior to Phase 2 construction. <br />The final main embankment will have an ultimate crest <br />length of 1,900 feet and an ultimate elevation oi` 8,620 feet. <br />The maximum embankment height will be approximately 155 feet. <br />D~35 <br />