2019-01-17_PERMIT FILE - C1996083A

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2.05.6(6) The Operator performed on -the -ground visual monitoring for subsidence damage (including fracturing) in Sheep Corral gulch in the area where multiple seam mining will occur. This monitoring was initially performed within 3 months after the gate road entries are developed, and on a quarterly basis thereafter during mining of the respective panels, and for six months post mining (monitoring to be done as weather permits). Mining occurred in the B-8 and B-9 panels from July 2009 through March 2010. Fractures were surveyed during November 2009 and the results sent to the Forest Service and the DRMS in March 2010. Fractures in this area were surveyed again in July 2010 and the results sent to the Forest Service and the DRMS in August 2010. The Operator has installed 15 subsidence monuments along the Pitkin Mesa Pipeline to monitor subsidence. Since mine activity is moving to the north an additional 7 subsidence monuments will be installed. Because of the monument's close proximity to Stevens Gulch Road, some of the same monuments will serve to measure subsidence along the road if any. Additional monuments will be installed along Stevens Gulch Road as shown on Map 27. The monuments will be installed one year prior to mining under the Road and the Pitkin Mesa Pipeline. The Operator has installed subsidence monuments near its three cabins. The Operator will conduct fish, sediment and macroinverteb rate sampling (as performed by WWE and MEC in 2012) on a biennial schedule during mining activities and twice following mining activities (at 5 and 10 year periods) underneath West Fork Terror Creek prior to bond release. A report will be distributed to the DRMS, BLM, USFS, and the USFWS documenting if statistically significant declines are observed related to mining activities. (BLM Decision Record (DOI-BLM-CO-S050-2013-0010 EA)) TR -100 2.05-171 - 03/15