2010-04-26_PERMIT FILE - C1980007A ‎(3)‎

• Permit No: C1980007A
• IBM Index Class Name: Permit File
• Doc Date: 4/26/2010
• Doc Name: Refuse Pile Expansion East
• Section_Exhibit Name: Exhibit 82 Refuse Pile Expansion East
• Media Type: D
• Archive: Yes

Refuse Pile Expansion East Permit Application
Mountain Coal Company, LLC
West Elk Mine
January 2010
Revised March 2010
Revised April 2010
Table of Contents
Certification................................................................................................................... ............................... v
1 .0 Introduction .............................................................................................................. ..............................1
2.0 Geotechnical Investigation and Design ................................................................... ............................... 2
2.1 Geotechnical Investigation ............................................................................ ..............................2
2.2 Geotechnical Analysis and Design .............................................................. ............................... 3
2.2.1 Software .......................................................................................... ............................... 3
2.2.1.1 Seepage Modeling ............................................................ ............................... 4
2.2.1.2 Stability Modeling ............................................................. ..............................4
is 2.2.2 Model Parameters ........................................................................... ............................... 4
2.2.3 Model Results ................................................................................. ...............................
6
2.2.3.1 Refuse Pile Configuration ................................................ ...............................
6
2.2.3.2 Model Results ................................................................... ...............................
6
2.2.3.3 Geotechnical Design ......................................................... ...............................
7
2.3 Subsidence ................................................................................................... ...............................
8
3.0 Hydrologic Analysis and Design .............................................................................. ..............................9
3.1 Hydrologic Water Balance Analysis ............................................................. ..............................9
3.1.1 Hydrologic Inputs ........................................................................... ...............................
9
3.1.2 Model Parameters ........................................................................... .............................10
3.1.3 Model Results ................................................................................. .............................11
3.1.4 Hydrologic and Hydraulic Modeling ............................................ ...............................
11
3.2 Ponds, Impoundments, Other Treatment Facilities and Diversions (Rule 2.05.3(4) & 4.05.6) 12
3.2.1 Design Inputs and Assumptions .................................................... ...............................
12
4.0 RPE East Refuse Pile Permit Design ....................................................................... .............................14
4.1 Stripping ....................................................................................................... .............................14
4.2 Buttress ........................................................................................................ .............................14
4.3 Drainage Blanket .......................................................................................... .............................14
4.4 Underdrain ................................................................................................... .............................15
4.5 Compaction .................................................................................................. .............................15
P:\Mpls \06 CO \26 \06261003 MCC Refuse Pile Site Review & Permit \WorkFiles\Permit Application \Text \2010- 04- 19_RPE East Permit Application.doc i