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RULE 2 PERMITS <br />Topsoil Redistribution Plan <br />Prior to any mining - related disturbances in the Collom area, all available topsoil will be removed from the <br />site to be disturbed as discussed in Section 2.05.3, and will be redistributed or stockpiled as necessary to <br />satisfy the needs of the reclamation timetable as described herein. <br />Final grading before topsoil placement will be conducted in a manner that minimizes erosion and <br />provides a surface for the topsoil that minimizes slippage. If spoil compaction is a problem, the spoil will <br />be ripped with a dozer to minimize compaction, assure stability and minimize slippage after topsoil <br />replacement. Where possible, development of concave landforms (to encourage snow entrapment) will <br />be developed on a case -by -case basis at the discretion of the field supervisor. Such landforms will still <br />have positive drainage in accordance with overall permitted designs. Topsoil will then be redistributed <br />and graded to a variable replacement depth following the general rule of thin topsoil (<6) inches on ridge <br />tops to gradually thicker topsoil moving down the slopes to the drainage bottoms for the grassland land <br />use targeted areas (see representation below). Sagebrush Steppe areas will ideally receive an average of <br />approximately 4 inches of topsoil that will likely be a more uniform application to encourage proper <br />seeding depth and overall shrub establishment conditions (see representation below). Colowyo will track <br />the volume of topsoil applied to each reclamation unit and report it within the Annual Reclamation Report <br />each year. Colowyo utilizes load counts and time card coding to differentiate and accurately assign <br />costs /volumes for all other material movement on the mine site. As such, Colowyo will utilize these tools <br />to ensure the planned and appropriate volume of topsoil is applied to each reclamation unit in the Collom <br />Area. A visual representation of Colowyo's Collom area drainage -wide topsoil replacement strategy is <br />provided below: <br />O -IO% "J"W,g <br />GsnerlC Cn - Section Tor Topsoil <br />Raplamn�wnt Osptlm Awes <br />a l'jrprr�l Crsrnwps <br />�j <br />0 <br />\ Arrnorod y'�� <br />"'.06 slop° <br />A Generally defined as a "thin" zone of topsoil (0 " -6 ") exclusively applicable to Sagebrush Steppe areas which will ideally average 4 inches <br />Areas seeded using the grassland mix will almost always be >10% slope and have > 6 inches of topsoil replaced. <br />B Collom expansion area topsoil replacement depths will begin with approximately 6 inches at the top of slope breaks >10% and gradually <br />increase to approximately 12 -18 inches mid -slope up to potentially 3 to 4 feet down -slope to the base of slopes with armored channels, depending <br />on slope length and topsoil balance considerations. <br />C Generally defined as the area within armored channels that will receive minimal to no volume of topsoil due to the likelihood any topsoil <br />placed within the structure would erode into terminal sediment control structures and be lost On -site experience has demonstrated natural <br />sedimentation processes will support vegetation early post construction, and these areas will be seeded via broadcast method to provide a seed <br />source for beneficial species establishment <br />NOTE: Specific details regarding topsoil replacement depths on special planting areas will be included in the description provided for approval <br />prior to the creation of those areas. <br />The grassland targeted reclamation blocks will by necessity have thicker layers of topsoil than recent <br />reclamation areas due to reduced volume of topsoil that will be placed on sagebrush steppe areas. Unless <br />Colowyo provides specific justi5cation, the topsoil resource will be placed in a manner that is thin on the <br />Collom — Rule 2, Page 106 Revision Date: 9/28/11 <br />Revision No.: PR -03 <br />