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Valley Fill Area #2 <br />Valley Fill Area # 2 will utilize the same Grass Lined and Rip-Rap Lined channel designs as <br />Valley Fill Area # 1. The grass lined channel will be used along the top of the bench. The <br />grouted rip-rap channel will be placed on the highwall cut area to transition the flow to the bench <br />and along the slope of the valley fill material. Boulder energy dissipaters will be used at the end <br />of the fill slope channel. The channel location can be seen on Map C-2B. <br />6. Topsoil and Overburden Handling <br />Topsoil on the site is approximately 0-6 inches thick and overburden ranges from 15 to 20' thick. <br />Topsoil that is salvaged from the all mining areas will be placed in the existing topsoil stockpiles <br />or placed in berms along the west and north side of the pit. Concurrent reclamation will be <br />conducted by grading mined out areas to the final reclamation topography. Widespread <br />topsoiling will happen after the pit is completely mined out due to the need for a large area of pit <br />floor to be used for product stockpiles. <br />Overburden will be used to backfill the mined out slopes to a 211:1 V. Overburden will also be <br />used to create the center pivot field and valley fills. The existing overburden piles have <br />approximately 100,000-150,000 tons of material. This overburden will be used in the same <br />manner as the freshly disturbed overburden. <br />6-A. Center Pivot Field <br />The overburden encountered during mining will be directly hauled to the northern portion of <br />Mining Areas 1 and 3. The center pivot field will be backfilled to a maximum slope of l OH: l V. <br />The overburden stockpiles in this area will be dozed into position by a D-8 or similar dozer. The <br />center pivot system is already set up on the field the west of the permit area. Additional details of <br />the center pivot field are in Exhibit E Reclamation Plan. <br />6-B. Valley Fill <br />The natural drainages passing through the pit will be filled using excess fines or overburden. <br />This required approximately 210,000 cy to fill Valley #1, has been completed as of July 2008. <br />Cugnini Pit, November 2009 D-12