2018-01-23_REVISION - C1981041 (21)

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17 C1981-041 RN7 findings CBA-1 and CBA-2, the Roadside Soil Borrow Area, and the overland conveyor corridor, including the section of conveyor that had been suspended over the Colorado River. Significant reclamation work was completed in 2008 at the South Portal Facilities including, facilities removal, grading, drainage construction and revegetation. The Unit Train Loadout is another facilities area where significant reclamation work was completed in 2009. The entire UTL area has been fully Phase III bond released; the property has been sold and is currently in use as an industrial site. The UTL area has been removed from the current permit area. Fill material from a low hill within the UTL facilities area was used for construction of a new access road and reclamation backfill in the South Portals area, as approved in PR-3. Reclamation of the South Portals area has been completed. Temporary sediment and drainage control structures including diversion and collection ditches and sediment ponds have all been reclaimed. With PR-5, SCC provided demonstrations that vegetation cover is sufficient to ensure that sedimentation from reclaimed areas does not exceed that from adjacent undisturbed areas. SCC has demonstrated that the untreated drainage from Roadside North Portal, Cameo Refuse Disposal Areas and Cameo Borrow Areas will contribute fewer suspended solids to streamflow or runoff outside the permit area than untreated drainage from the natural surrounding premining area. This was accomplished by a soils loss comparison between these disturbed locations and corresponding non-disturbed reference areas using the Universal Soil Loss Equation. SCC adequately demonstrated that the quality of untreated drainage from these disturbed areas meets the State and Federal water quality standard requirements applicable after the sedimentation ponds and other drainage control features are removed, for receiving streams. With PR-5, SCC was approved to make changes to the final reclamation plans of Ponds 6, 10, and 11, Coal Gulch, the Coal Canyon drainage and Roadside North Portal. As part of the design for CRDA-2, the Coal Canyon drainage channel was permanently realigned to provide a more uniform, controlled flow between CRDA 1and 2. Sections of the Coal Canyon permanent channel diversion near Ponds 6 and 10, and the Coal Gulch drainage in the vicinity of Pond 11 were originally planned and approved to be re-aligned and modified in conjunction with removal of the ponds. The Coal Gulch and sections of Coal Canyon drainage were going to be diverted back through the pond locations which would approximate these drainages original configuration. However, during the review process and after meeting with a representative from the U S Corp of Engineers it was recommended that Coal Canyon drainage and Coal Gulch remain in their current configurations. These drainages are stable in their current position and according to Corp of Engineers personnel realignment for the sake of routing the drainage back to its original contours would not be a justifiable reason for issuing a Corp Permit. The Division concurred with not re- disturbing the alignment of Coal Canyon and Coal Gulch and with PR-5 approval left these drainages in their present alignment and configuration. The Xcel Energy Cameo Power Plant, located adjacent to the Roadside North Portals, was demolished in 2013. Several permanent ephemeral drainage channels were originally approved to be constructed across the North Portal facility reclaimed area in association with removal of the temporary upland diversion and Sediment Pond 13. However, with design changes approved with PR-5, the upland