2018-05-30_PERMIT FILE - C1981022A

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Section - 2.05.6 Surface Mining_Near Underground Mining All historical, existing, and proposed mining operations in the mine permit and adjacent areas have been, are, ox will involve underground mining methods. Given site topography and the location and occurrence of the minable coal seams, the potential for any surface mining in the immediaate area is _____nte. Gipv_n t}?at th PrP is nn it c'_Arby cl_lrfarP M=ning, fl]1S YYOll~atnrV Seffilln i$ nnr annllCa}ll P. - D J l l Subsidence Survey, Subsidence Monitoring, And Subsidence Control It has been determined that no renewable resource lands and a limited number of certain structures are present within the permit and adjacent aeeas. A detailed inventory and description of the structures that could potentially be affected by mining-related subsidence along with a subsidence control and monitoring plan are presented in Exhibit 2.05-E8, Subsidence Control and Monitoring. The following discussion is a general summary of the current conditions, historical subsidence experience, and existing and proposed control, mitigation, and monitoring considerations and measures. Inventory of Structures and Renewable Resource Lands - Structures located within and immediately adjacent to the permit area are shown on the General Facilities Map (Map 2.05-M1) and the Mine Plan Map (Map 2.05-M2}. The majority of the structures in the immediate area are owned and controlled by OMLLC, however, there are a Few privately-owned houses or other structures within or adjacent to the permit area. The Union Pacific railroad line, State Highway 133, Mountain Coal Company's rail load out and Delta-Montrose Electric Association powerlines exist on or cross the south edge of the permit area. The maps also show the predicted area of influence from potential subsidence. The Existing Topography and Land Use Map, (Map 2.04-M1} also shows the location of any surrounding structures, the lack of any renewable resources as a pre-mining land use within the affected areas and the lack of areas used For agriculture or silvicultural production of food and fiber and pasturelands. The predominate use for those portions of the pexntit azea designated as "undeveloped" lands aze rangeland and wildlife uses. In addition, the "Final Environmental Impact Statement; Iron Point Exploration License, Iron Point ",rr~ Coal Lease Tract; Elk Creek Coal Lease Tract; Delta and Gunnison Counties, Colorado", USDI-BLM V° and USDA-Forest Service, February 2000 (EIS) states on page 3-90 "That portion of the forest ~ within which the project area lies has not been subject to intensive logging or forest management ~ practices. Most desirable timber species occur on slopes too steep or are located in drainages too narrow for efficient logging to occur. Typically, slopes oven 40 percent are not subject to commercial logging Qones, 1999a)." The EIS relied upon information found within the BLM Uncompahgre Basin Resource Management Plan (RMP) completed and approved in July 1989 and the amended USFS Land and Resource Management Plan (LRMP) dated September 1991. Observations by ONILLC personnel and conversations with local ranchers in the area axe consistent with the EIS findings. In accordance with Rule 2.05.6(6)(a)(i), if an inventory shows no structures or renewable resource lands exist within the affected area, no further information must be supplied regarding subsidence. OMLLC is therefore not proposing to perform any additional subsidence monitoring other than that which is ongoing to monitor historic, existing landslide features. See the section "Subsidence Monitoring Program" fox details of this program. Worst Case Consequences to Structures and Renewable Resource Lands - In general, as indicated by the maps previously referenced, the majority of the existing structures are outside of the predicted area of influence from potential subsidence-related impacts. For those structures within the area of influence, the worst case consequence to these structures, in the unlikely event it occurred, PROS 2.05-102 Revised September 2002