2019-04-24_REPORT - C1980007

• Permit No: C1980007
• IBM Index Class Name: Report
• Doc Date: 4/24/2019
• Doc Name: Subsidence Monitoring Report
• From: Mountain Coal Company, LLC
• To: DRMS
• Annual Report Year: 2018
• Permit Index Doc Type: Subsidence Report
• Email Name: LDS
• Media Type: D
• Archive: No

TABLE OF CONTENTS
Page
1.0 BACKGROUND..............................................................................................................3
2.0 GENERAL SUBSIDENCE OBSERVATION AND REPORTING .....................................5
3.0 OTHER SUBSIDENCE MONITORING............................................................................7
3.1 Monument Dam/Minnesota Reservoir Monitoring ..............................................................7
3.2 USFS Roads and Stock Pond Monitoring...........................................................................8
3.3 Monument Dam/Minnesota Reservoir Aerial Photograph Comparison..............................8
3.4 U.S. Forest Service Water Resources Survey....................................................................8
3.5 Mineable Extent Map ..........................................................................................................9
4.0 FALL 2018 SUBSIDENCE OBSERVATIONS...............................................................10
4.1 Traverse A-A' .................................................................................................................... 10
4.2 Traverse B-B' .................................................................................................................... 11
4.3 Traverse C-C..................................................................................................................... 12
4.3.1 Location 1 ....................................................................................................... 13
4.3.2 Location 2 ....................................................................................................... 14
4.4 Traverse D-D..................................................................................................................... 15
4.4.1 Location 3.......................................................................................................................... 16
4.4.2 Location 4.......................................................................................................................... 17
4.4.3 Location 5 ....................................................................................................... 19
4.4.4 Location 6 ....................................................................................................... 19
4.5 Traverse E-E. .................................................................................................................... 19
4.6 Traverse F-F......................................................................................................................21
5.0 CONCLUSIONS............................................................................................................22
6.0 BIBLIOGRAPHY...........................................................................................................25
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