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Designs for all elements of the sediment control plan are contained in Appendices 5-2, 5- <br />9, 5-10, and Map 5-10. <br />Stream Channel Reconstruction (Carbon Junction Canyon) <br />The Upper Carbon Junction Canyon was reestablished as requested and approved by <br />CDRMS through TR17. Plans for the modifications are contained in Appendix 5-12. The <br />work was completed in November 2013. <br />2.05.3(5) Topsoil <br />Topsoil salvaged prior to disturbance in a given area was replaced during reclamation of <br />the mine in 2006 and reclamation of the sediment control system in 2008-2009. Topsoil <br />stockpiles #4 and #7 were determined to contain topsoil excess to that required for <br />reclamation as detailed in the approved reclamation plan and were approved for in situ <br />retention (Technical Revision 16). <br />The soil stockpiles were seeded with the following seed mix: <br />Species lbs./acre <br />Slender Wheatgrass <br />10.0 <br />Western Wheatgrass <br />10.0 <br />Thickspike Wheatgrass <br />10.0 <br />Crested Wheatgrass <br />3.0 <br />Perennial Rye Grass <br />3.0 <br />Cicer Milkvetch <br />1.0 <br />Utah Sweetvetch <br />1.0 <br />Total Seed Rate <br />38.0 <br />2.05.3(6) Overburden <br />From the early mining activities the swell factor has been estimated at 30%. This swell is <br />based upon a calculation made from the existing pit and fill area. It should be noted that <br />there is a slight variance between the original topographic maps and those flown in 1990 <br />by Air Photo Surveys. <br />Prior to placement of material in the permanently reclaimed spoils area (box cut spoil), <br />and after the removal of soil materials, the applicant placed a sandstone underdrain in the <br />bottom of the spoil. The size of the underdrain was as designed with no less than 15 feet <br />of sandstone, more than 2 feet in diameter, and had the following approximate size <br />distributions which were confirmed during placement: <br />Abridged Permit Document 5-4 Permit Revision PROI 9/2014 <br />