2007-10-30_PERMIT FILE - C1982057A ‎(3)‎

• Permit No: C1982057A
• IBM Index Class Name: Permit File
• Doc Date: 10/30/2007
• Section_Exhibit Name: Tab 20 Backfilling and Grading
• Media Type: D
• Archive: Yes

i
TAB 20
TABLE OF CONTENTS
Page
Disturbed Area 1
Backfilling and Grading Procedures 2
Postmining Topography 5
General 5
Volume Calculations (Premining Topography) 6
Premining Material Volume 6
Virgin Overburden Material Volume 6
Total In-Place Coal Volume 6
Recoverable Coal Volume 6
Premining Overburden Volume ti
Total Pit Spoil Volume 10
Volume Calculations (Postmining Topography) 10
Postmining Drainage Channel Design 11
Postmining Drainage Channels in the South Area 14
Vegetated Channel Designs 14
Rock Riprap Channel Design 16
Turf Reinforcement Mat Channel Deign 16
References Cited 18
LIST OF FIGURES
Figure No. Page
20-1 Postmining Topography Typical Mass Balance 9
LIST OF TABLES
Table No. P~9?
20-1 Postmining Landform Mass Balance (North Area) 7
20-1A Postmining Material Mass Balance - II-W South Area 8
20-2 Postmine Drainage Channel Summary 13
20-3 Guide to Retardance Class Selection 15
20-4 Turf Reinforcement Mat Performance Guide 17
LIST OF ATTACHMENTS
Attachment No. Description
20-A Pit Backfill Stability Report
20-B 2006 Neckpit Slide Remediation Plan
TR- 59 i Revised 05/07