2024-11-22_PERMIT FILE - C1992081 (2)

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Hayden Gulch Loadout C-1992-081 Sediment Control Plan for Remaining Reclaimed Railroad Spur Area 1.0 Introduction The Hayden Gulch Loadout (HGL) is a former coal loadout located in Routt County, approximately 2 miles southeast of Hayden Colorado. The last active use of this facility was for temporary coal storage in 1992. Since that time the loadout facilities, rail spur, and offices have been removed and reclaimed and the former haul road has been transferred to Routt County for use as a public county road. The Hayden Gulch Terminal facility originally consisted of 391.2- acres. However, all but 6.8-acres of the facility, of which 2.3-acres were disturbed, have received complete Phase III Bond Release. The small 2.3-acre parcel was formally associated with the railroad bed that led to main rail spur and is located within the interior of a grass hay agriculture field. The area was reclaimed in 2021 to meet the agriculture postmine landuse of DRMS Permit No. C-1992-081 and the reclaimed ground is indistinguishable from the surrounding, undisturbed, portions of the agriculture field. A Site Map depicting the remaining 2.3-acre parcel that is relevant to this Sediment Control Plan, the three stormwater outfalls established under CDPHE Permit No. C00049071, and receiving water bodies is provided in Appendix A. 2.0 Best Management Practices The HGL has developed a plan to manage runoff from disturbed areas with Best Management Practices (BMPs). The 2.3-acre parcel that this Sediment Control Plan applies to only represents about two percent of the overall agriculture field. This parcel has been reclaimed to meet the postmine land use requirements of DRMS Permit and blends seamlessly with the larger agriculture field. The reclaimed parcel is surrounded by a network of agriculture drainage ditches and the areas downstream of the outfalls are extremely limited and too small to install stormwater collection or infiltration devices, both of which would reduce the area available for production and would also prevent efficient harvesting by the farmer. Therefore, the stormwater runoff control measure implemented for the three outfalls is vegetation. Appendix B includes the SedCAD model that demonstrates that the reclaimed 2.3-acre area will not result in sediment yields that exceed those for the agricultural area prior to disturbance. Due to very small size of this parcel, the dense vegetation, and very flat topography, there is less than a 0.00 cfs peak discharge and no appreciable change in the in the peak settleable solids or peak sediment concentration in response to the10-year, 24-hour design storm event. 3.0 Maintenance/Construction The HGL is fully reclaimed and closed. No industrial equipment or systems are located onsite. The only area applicable to the Sediment Control Plan is a small parcel within a larger agriculture field. This area has been fully reclaimed and the grass hay vegetation is indistinguishable from the vegetation in the surrounding agriculture field. Vegetation is the only practical control that aligns