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Species <br />Rate <br />(lbs PLS /acre) <br />Intermediate Wheatgrass <br />5.0 <br />Russian Wildrye <br />4.0 <br />White Sweetclover <br />1.25 <br />Rates are for broadcast seeding. <br />However, because it is unlikely that all the available soils will be stripped at one time, and <br />stockpile materials will continually be used for reclamation, the stockpiles will likely be <br />disturbed on a frequent basis and seeding the stockpiles may not be practical during the course of <br />the operation. <br />If stockpile seeding is not used, surface roughening will be maintained to limit wind and water <br />erosion. In place of surface roughening, using closely spaced plastic fencing laid out in a north - <br />south direction on the windward side (west) of the stockpiles could also be used. Although these <br />fences create a lot of turbulence they also act to cause windblown particles to drift between the <br />fences similar to a series of snow fences. Additionally, if practicable, the topsoil stockpile <br />should be placed east of the overburden stockpile in the stockpile area north of the pit. This may <br />help shield the topsoil stockpile from most of the harsher winds. <br />Diversions and Impoundments <br />Roads to the north and east of the mining area will effectively minimize stormwater surface <br />run -on to the mining site, therefore run -on diversion structures are not anticipated. Until late in <br />the overall mining operation, the amendment area mining pit will not have a surface outlet, and <br />stormwater that falls directly on the affected area will be contained in the pit. If stormwater flow <br />into the pit exceeds immediate percolation rates, a low and isolated section of the pit will be used <br />to allow standing water to infiltrate with time. <br />As the mining operation nears completion, the southern end of the pit will be contoured to drain <br />freely into the Rock Creek valley. As the pit is opened and drainage contours are developed, <br />best management practices will be used to minimize erosion and sediment transport on disturbed <br />areas. Best management practices may include slope flattening, rock armoring, flow velocity <br />and sedimentation barriers, and timely revegetation. <br />Only during final reclamation will the mine pit area be graded and stabilized to allow surface <br />drainage off of the permit area. During the mining and reclamation period, the appropriate <br />stormwater discharge permit will be obtained from the Colorado Department of Public Health <br />and Environment and the associated monitoring and stormwater management plan will be <br />followed for surface water discharges. <br />Fountain Pit M -1982 -155 <br />DRMS 112 Permit Amendment Revised in Response to Adequacy Review Comments' Page 9 <br />