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Mr. John Haines -2- September 30, 1983 ~ ~ 3. Mhere will the topsoil stockpile for each phase be located and how many cubic yards will be stockpiled in each? 4. Topsoil to be stockpiled for greater than 1 growing season should ~ ~ have a perennial grass cover crop planted to aid 1n protecting the topsoil from wind and water erosion. 5. The proposed mining activity 1s located ~n an inside bend of the South Platt River which is subject to frequent flooding. In order to reduce the potential of the river causing a breach in the pond and potentially altering course, the staff recommends that the operator commit to maintaining a minimum undisturbed setback of 200 feet from the east high water line of the South Platte River and the mining activity. D K The east high water line in this case can be defined as that point where the sand bar ends and cottonwood trees are actively growing. The presence of existing vegetation with their associated roots will significantly assist in stabilizing the setback to maintain the integrity of the proposed lake. C. Exhibit E - Reclamation Plan DK 1~ Please state the average haul distance for topsoil replacement from the topsoil stockpile for each phase of mining. 2. Please justify the application of 200 seeding. The staff would suggest that this ~ ~ and could potentially burn the seed and your necessary, the staff would suggest that the fertilizer during the 2nd growing season to during the first year. lbs/acre of P205 prior to amount of phosphorus is high iy seedlings. If deemed operator apply a balanced avoid encouraging weed growth 3. To reduce the cost of mulch on this site and increase the p K effectiveness, the staff recommends that the operator drill seed winter wheat, by incorporating this species into the seed mix. 4. The proposed seed mix contains an excessive pure live seed rate for each species. The staff suggests that the operator consider using the Off- following grass seed mix which has been figured at 50 pure live seeds per square foot. Intermediate wheatgrass 4.7 lbs. PLS/acre Perennial ryegrass 2.2 lbs. PLS/acre Orchard grass 1.0 lbs. PLS/acre Smooth brome 3.0 lbs. PLS/acre Hinter wheat (mulch) 12.0 lbs. PLS/acre Yellow sweetclover .5 lbs. PLS/acre This seed mix should be planted between July 15 - August 15 for maximum benefit of the winter wheat mulch.