2015-06-22_PERMIT FILE - C1996083 ‎(2)‎

• Permit No: C1996083
• IBM Index Class Name: Permit File
• Doc Date: 6/22/2015
• Doc Name: CMWB Final Design, WESTEC Report, June 1996
• Section_Exhibit Name: Volume IV Coal Mine Waste Bank Final Design for the mine
• Media Type: D
• Archive: No

VOLUME IV
TABLE OF CONTENTS
SECTION PAGE
1.0 INTRODUCTION....................................................................................................... 1
2.0 SITE CONDITIONS ...................................................................................................2
2.1 SURFACE CONDITIONS.................................................................................2
2.2 SUBUSRFACE CONDITIONS..........................................................................3
3.0 DESIGN PARAMETERS............................................................................................5
4.0 DESIGN ASPECTS ...................................................................................................6
4.1 CONSTRUCTION.............................................................................................6
4.1.1 General................................................................................................6
4.1.2 Underdrain System..............................................................................7
4.1.3 Haul Roads..........................................................................................8
4.1.4 Runoff Control Ditches ...................................................................... 10
4.1.5 Material Balance/Material Stockpile .................................................. 12
4.2 SEDIMENT POND...................................................................................13-13i*
4.2.1 Hydrology .......................................................................................... 14
4.2.2 Sedimentology................................................................................... 15
4.2.3 Estimated Sediment Pond Volumes.................................................. 17
4.2.4 Sediment Pond Embankment............................................................ 17
4.2.5 Sediment Pond Dewatering............................................................... 18
4.2.6 Maintenance...................................................................................... 19
4.3 SLOPE STABILITY.........................................................................................20
4.3.1 Groundwater Conditions....................................................................20
4.3.2 Material Properties ............................................................................20
4.3.3 Sediment Pond Slope Stability..........................................................22
4.3.4 Results...............................................................................................22
5.0 RECLAMATION.......................................................................................................24
6.0 USE OF THIS REPORT..........................................................................................25
7.0 REFERENCES........................................................................................................26
* The Gob Pile Sediment Pond is also known as `Pond D. As part of TR-43. Pond D was
redesigned and the supporting documentation for the new design is no longer part of this
Volume. The PHC for Pond D is located in Volume 111, pages Exh. 8-17 through 19, the
SEDCAD output is now located in Volume 111, pages 207& 208. The upland runoff areas are
shown on Map 20 in Volume Il. Culverts and ditches have also been redesigned and the design
information is included in Exhibit 8 of Volume 111.
MR-168 i 11/14