2012-12-14_REPORT - C1980007

• Permit No: C1980007
• IBM Index Class Name: REPORT
• Doc Date: 12/14/2012
• Doc Name: May 2012 Refuse Pile Expansion East
• From: Mountain Coal Company
• To: DRMS
• Permit Index Doc Type: Waste Pile/Fill Report
• Email Name: JRS
• Email Name: DIH
• Media Type: D
• Archive: No

Refuse Pile Expansion East
TR -128
Haul Road Slide Repair Documentation, Slope Stability Monitoring
Instrumentation, and Drainage Revisions
May 2012, Revised December 2012
Table of Contents
1.0 Introduction and Background 1
1.1 Background 1
1.2 Report Organization 2
2.0 Haul Road HR -1 Slump 3
2.1 Site Characterization 3
2.1.1 Geometry 4
2.1.2 Groundwater 4
2.1.3 Modeling Parameters 4
2.2 Repair Construction 6
2.2.1 Identified Seepage Locations 6
2.2.2 Construction Methodology 6
2.3 Construction Observation 7
2.4 Final Conditions 8
2.4.1 Approach to Slope Stability Analysis 8
2.4.2 Modeling 8
2.4.3 Geometry 9
2.4.2 Results 9
2.4.2.1 Seepage Analysis 9
2.4.2.2 Stability Analysis 9
2.4.3 Recommendations 10
3.0 Slope Monitoring Instrumentation 12
3.1 Haul Road HR -1 Area 12
3.1.1. Survey Mirrors 12
3.1.2. Inclinometers 12
3.1.3. Piezometers 13
3.1.4 Monitoring Schedule 13
3.2 RPEE Buttress and Refuse Pile Area 14
3.2.1 Survey Mirrors 14
3.2.2 Inclinometers 14
3.2.3. Piezometers 15
P. \Mpls \06 CO\26 \06261003 Haul Road Slide Repair \WorkFi]es \Report \MCC_Slump _Repair - Instrumentation -Drain Rev 2012- 12- 12.docx
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