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revegetated using the project upland seed mix. <br /> 5. A two-foot thick low permeability layer will be placed on top of the existing channel excavation above <br /> all observed mine waste. <br /> 6. An armor layer will be placed on top of the low permeability layer. This armor layer will be a minimum <br /> of one foot thick. The armor layer will be built using reclaimed onsite soils, gravels and cobbles. <br /> 7. Grade control structures will be built into the channel invert through the mine waste sections. The <br /> grade control structures will be built of large cobble to minimize the potential for the channel to <br /> downcut. <br /> 8. The elevation of the new channel through the mine waste area will be raised approximately 2-3 feet <br /> above original design elevations approved under TR02 to accommodate the low permeability and armor <br /> layers. <br /> 9. Channel banks will be armored to minimize the potential for lateral channel migration. Armoring will be <br /> accomplished using a matrix of gravels and cobbles buried outside the active channel section.This lateral <br /> armoring will minimize the potential for future lateral erosion into mine waste. <br /> 10. Mine waste exposed outside of the channel area and in the side cuts of the channel will be capped with a <br /> minimum of two feet of material. <br /> Time is of the essence to keep this important restoration project on track. Expeditious written confirmation of <br /> the acceptance of this notice would be greatly appreciated. If you have any questions, please contact us at your <br /> earliest convenience. Thank you in advance for your attention to this matter. <br /> Sincerely, <br /> r-, <br /> Brian rch <br /> Summit County Open Space and Trails Director <br /> Cc. Scott Vargo, Summit County Manager <br /> Thaddeus Noll, Summit County Assistant Manager <br /> Jason Lederer, Open Space and Trails Resource Specialist <br /> Encl. River Realignment and Mine Waste Mitigation Plan —Sheet 03A <br /> Waste Management Containment Sections—Sheet 06A <br /> Swan River Resource Soil Sampling Analytical Results (July 12, 2016) <br /> IXURoyal Tiger Mine and Mill Site Voluntary Clean-up Plan, Summit County Colorado, Colorado - <br /> approved by the Colorado Department of Public Health and Environment, October 27, 2004. <br /> Environmental Covenant, IXURoyal Tiger Property. Summit County, Colorado. September 20, 2005. <br />