2011-01-28_REVISION - C1980007 (2)

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West Elk Mine (or lack there of) for constant, high volumes of coal. MCC will notify the Division if plans that may affect the subsidence profile are implemented. Preventive Measures (Surface) - 205.6 (6) (1) NO(C)a-" Surface measures that may be taken to reduce or prevent damage to applicable structures or water resources could include, but are not limited to; (1) Engineering, design, and construction of structures to withstand varying ground stresses, (2) Re-locating structures or ponds to mid-panel or outside the angle of mining influence, and/or (3) Enhancing or reinforcing water resource production or delivery systems (e.g., pipeline), respectively. A total of five reflector stations will be placed in the Deep Creek Ditch at the transition of the ditch into the Dry Fork Basin. Should E-seam longwall panel E6 be extended under Deep Creek Ditch in the Projected Potential Mining Area (see Map 51), additional reflector stations will be added at approximately 300-foot spacing along the entire length of the ditch that is undermined upstream of the aforementioned five stations and surveys conducted as below. The stations will be surveyed on the following schedule. 1) Pre-mining - At least one baseline survey will be conducted within the 30-day period before the longwall starts in Panel E5. If the ditch will be undermined during winter conditions this survey may be done at the end of the period of seasonal access prior to the expected start of mining in panel E5. 2) During mining - Monthly surveying will be conducted while the longwall face is within 1000 feet of being underneath the ditch (if seasonal access permits). The same will occur if longwall panel E6 is extended eastward and under the ditch. 3) Post-mining - Monthly surveys will be completed for the first two months after each longwall face has proceeded to more than 1000 feet from being underneath the ditch (or only one final survey will be done if seasonal access is unavailable during the 30-day period immediately following undermining of the ditch). Data from the surveys will be reported in the subsequent semi-annual subsidence report. Detailed DescHoden ofMidradnz Measures - 2.05.6(6)0960)(A D) Impacts to structures (buildings) and ground and surface water resources will be monitored and mitigated, if necessary, as presented later in this section, in Sections 2.04.7(3) and 2.05.6(6)(e)(ii)(A-C), in Exhibit 19C, and in Exhibit 52. Monitoring personnel (e.g. hydrology, subsidence survey) are regularly in the field throughout the permit area and note observations of cracking, landslides, rockfalls, or other natural and/or subsidence hazards or impacts. The private landowner in the Jumbo Mountain lease tract also observes and reports cracking, sliding, or other unusual conditions. Roads will be repaired through regarding or filling if adversely affected by subsidence. Should cracking or blockage of a trail or an unimproved road that is open for use (i.e. is not blocked, reclaimed, or otherwise "closed" from use) occur from subsidence, the damage would be repaired (i.e. fill crack, buttress, install drains, or remove blockage etc.) or the area barricaded or blocked to prevent access. MCC will also place an informational sign along the primary public access to the USFS lands for mining and/or natural hazards awareness. MCC recognizes that proposed mitigation to surface waters, roads, vegetation, wetlands, etc. on Forest lands in the SOD will be accomplished in accordance with the USFS stipulations specified on the BLM Federal Lease C-1362. This document contains the stipulations agreed to by MCC with the Forest regarding, in part, the mitigation requirements for mining related impacts within the Forests Lands in the SOD area. MCC will repair impacts of subsidence on surface drainages on USFS lands (or other private lands), including revegetation as necessary to control erosion. For any impacts occurring on USFS lands, MCC will consult the USFS immediately to determine a) The level of mitigation needed, and b) The feasibility of employing the proposed mitigations. Should these impacts occur on USFS lands, MCC, in conjunction with the USFS, will evaluate the impacts on a case by case basis to assess the most appropriate mitigation. MCC will seek Forest Service approval for any mitigations) on USFS lands. 2.05-170 Rev. 06105- PR10, 03106- PRIG, 05106- PRIO, 111060- 78107, 04107- TR108, 09107- PRl2, 02108- PR11, 11/10- TR124