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<br />Additionally, placement of two to four inches of the limited topsoil on the <br />yet to be determined pit benches and floor, over somewhat fractured hedrock, <br />may present a problem with reoard to adequate plant-rooting and water- and <br />nutrient-holding capacity of the plant-growth medium. In tr~eir discussion of <br />the Ponderosa Pine Inte mediate Elevation T.vpes, C.Wa.yne Cook, Robert M. Hyde <br />and Phillip L. Sims, in their Reveqetation Guidelines for Surface Mined <br />Areas, Colorado State University ange c~ence uepar ment c~ence ~e n es No. <br />To; 6ecember, 1974, state that: <br />This vegetation type can be successfully re vegetated when <br />topsoils are added back to a depth of 18 to 24 inches or to a depth of <br />10 inches over subsoils that provide a plant growth medium to at least 18 <br />inches in depth. Many subsoils in this vegetation type can be used as a <br />plant growth medium but replacement or incorporation of topsoil <br />encourages more rapid growth and stabilization. Use of toasoi~ is <br />especially important on drier sites such as south and west-facing <br />slopes. Alluvial soils in swales may serve as plant growth media if <br />saved in the mining process." <br />In addition to utilizing the sediment collected in the settlement as part of <br />the plant growth medium, the Division recommends screening enough fines to <br />replace a total depth of 18 inches of plant growth medium atop the benches. <br />Additionally, the Division requires that the sediments salvaged from the <br />settling basin and any reserved fines from the screeninp process, be <br />stockpiled separately from the topsoil resource. Please provide the location <br />of the the expected topsoil and sediment/fines s*_ockDiles on the Mining Plan <br />Map. <br />At their February 22, 1989 meeting the Colorado Mined Land Reclamation Board <br />directed the Division and Rocky Mountain Asphalt, Inc. to work together to <br />devise a reclamation plan which will satisfy the perfo manse staneards set <br />forth in the tdinerals Rules and Regulations Number 6. The Division supaests <br />that Rocky Mountain Asphalt propose options to demonstrate how final bench <br />configurations and varying depths of topsoil replacement will adequately <br />comply with the perfo manse standards. <br />The revised upper bench(es) design proposed by Schnabel's January 20, 19B9 <br />letter illustrated that the top of the uppermost sloped backwalt was nearly on <br />the U.S. Forest Service/American Christian College, Inc. land boundary. <br />Please provide a 50 ft. buffer zone between the fence olanne~ tc• oe <br />constructed around the Dit perimeter and the landownership boundary. <br />