2011-05-17_PERMIT FILE - M2011013

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Table 1 Estimated Reject Material and Topsoil Volumes Estimated Sandstone Stockpile, cu. yd. 50,000 Historic Reject 40% Estimated Reject Material, cu. yd. 20,000 Estimated Void Spaces 25% Estimated Volume Pore Spaces, cu. yd. 5,000 Reclaimed Area Footprint, sq. ft. 138,473 Depth of Reject Material, ft. 3.90 Volume Topsoil Required,6" deep, cu. yd. 2,564 Equivalent Depth Topsoil (pore plus 6"), ft. 1.47 Total Volume Topsoil and Reject Material, cu. yd. 27,564 The proposed post mining contours are shown on the revised Exhibit F - Reclamation Map. The post mining contours assume no quarrying will occur after all the stockpiled stone is processed. The post mining contours will be revised as part of a permit revision if a decision is made to quarry the Dakota sandstone after the stockpiled stone processing is completed. The soil will be roughed up by small tracked vehicles. Compacted material will be ripped a minimum of 12" prior to placing topsoil. The seed will be broadcast by either a hand held or equipment mounted seeder. The soil will be tested to determine what, if any, soil amendments are required per the recommendations of the local NCRS office. Clean straw will be used as mulch at the rate of one to one and a half tons per acre and crimped using the small tracked equipment or a disc. Seeding will be done in the fall prior to snowfall. The proposed seed mix is: PLS Species Broadcast Streambank wheatgrass 6.6 Western wheatgrass 6.4 Hard fescue 0.8 Arizona fescue 1 Canada bluegrass 0.2 Cicer milkvetch 2.6 Sand dropseed 0.05 White yarrow 0.05 Total 17.7 The proposed reclamation seed mix has been chosen to stabilize the slopes and to have a low palatability so that wildlife is not attracted to the runway area where aircraft could collide with them. Revised 5110111