2008-10-15_REPORT - C1980007 (2)

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Review Checklist for Subsidence Monitoring Report Mine: West Elk Mine Date this review was completed: 10/15/08 Permit No.: C-80-007 CDRMS reviewer: Tom Kaldenbach Report period: Fall 2007 Ify 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 undermining. monument grid installed over Located monuments to their first three longwall panels. detect vertical 2.05.6(6)I(i)(B) Yes This monitoring verified their subsidence and subsidence predictions. From horizontal displacement. 2000 to Fall 2007, West Elk Monitored each conducted an annual visual structure's orientation, 2.05.6(6)I(i)I Yes inspection of recently undermined location, elevation. areas and previously identified Monitored each subsidence features. The monument and structure 2.05.6(6)1(i)(D) Yes frequency of this visual at least quarterly. inspection was increased to semi- Commenced monitoring annually beginning in Fall 2007. of each monument and The only structures undermined structure at least one 2.05.6(6)I(i)(D) Yes since the Spring 2007 reporting month prior to period have been USFS ponds undermining. and roads. The monitoring plan is consistent with the existing Submitted monitoring level of need for verifying the report at least 2.05.6(6)I(i)(E) Yes subsidence prediction, as required semiannually. by 2.05.6(c)(i)(F). The traverses in the Fall 2007 Conducted sufficient study included observations at previously identified subsidence post-mining monitoring 2.05.6(6I(i))(F) Yes features, and the report describes to verify subsidence changes to those features that prediction have occurred since previous visual inspections. 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