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Review Checklist for Subsidence Monitoring Report Miae: West Elk Mine Date this review was completed: 10/19/06 Permit No.: C-80-007 CDRMS reviewer: Tom Kaldenbach ,.~J[ Report period: 2005 1 f Monitoring requirement Regulation citation In compliance: Yes / no . Comment Installed and surveyed Prior to 2000, West Elk monuments prior to 2.05.6(6)(c)(i)(A) Yes monitored subsidence in a underminin . monument grid installed over Located monuments to their first three longwail panels. detect vertical 2.05.6(6)(c)(i)(B) Yes This monitoring verified their subsidence and subsidence predictions. Since horizontal dis lacement. then, West Elk has conducted Monitored each only an annual visual inspection structure's orientation, 2.05.6(6)(c)(i)(C) Yes of recently undermined areas and location, elevation. previously identified subsidence Monitored each features. The only structures monument and structure 2.05.6(6)(c)(i)(D) Yes undermined have been USFS at least uarterl ponds and roads. This monitoring Commenced monitoring plan is consistent with the of each monument and existing level of need for structure at least one 2.05.6(6)(c)(i)(D) Yes verifying the subsidence month prior to prediction, as required by undermining. 2.05.6(c)(i)(F). Future mining has recently been approved in the Submitted monitoring South of Divide area where report at least 2.05.6(6)(c)(i)(E) Yes monitoring of monuments and semiannually. submittal ofsemi-annual reports is re uired. The traverses in the 2005 study Conducted sufficient included observations at post-mining monitoring previously identified subsidence to verify subsidence 2.05.6(6(c)(i))(F) Yes features, and the report describes prediction changes to those features that have occurred since the 2004 re ort. Accurately predicted 2.05.6(6)(d)(i) Yes subsidence. There was no imminent or actual material damage or diminution of 2.05.6(6)(d)(i) Yes use of renewable resource lands or structures