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4.03.2 Access Roads ................................................................................................. ...............2 • 4.03.3 Light-Use Roads ............................................................................................ ...............3 4.04 SUPPORT FACILITIES ................................................................................... ...............3 4.05 HYDROLOGIC BALANCE ............................................................................ ...............3 4.05.1 General Requirements ................................................................................... ...............3 4.05.2 Water Quality Standards and Effluent Limitations ........................................ ...............5 4.05.3 Diversions and Conveyance of a Watershed Less than One Squaze Mi]e ..... ...............5 4.05.4 Stream Channel Diversions (Relocation of Streams) .................................... ...............6 4.05.5 Sediment Control Measures ........................................................................... ...............6 4.05.6 Sedimentation Ponds ..................................................................................... ...............9 4.05.7 Dischazge Stmctures ...................................................................................... .............13 4.05.8 Acid-forming and Toxic-Forming Spoil ......................................................... ............15 4.05.9 Post-Mining Impoundments ........................................................................... ............1 S 4.05. ] 0 Underground Mine Entry and Access Dischazges .......................................... ............16 4.05.11 Groundwater Protection .................................................................................. ............16 4.05.12 Protection of Groundwater Recharge Capacity .............................................. ............16 4.05.13 Surface and Groundwater Monitoring ............................................................ ............17 4.05.14 - 4.05.18 Various Topics ................................................................................................ ............19 4.06 TOPSOIL ........................................................................................................... ............19 4.07 SEALING OF DRILLED HOLES AND UNDERGROUND OPENINGS ...... ............20 4.08 USE OF EXPLOSNES ..................................................................................... ............20 4.08.2 Pre-Blast Survey ............................................................................................. ............20 4.09 DISPOSAL OF EXCESS SPOIL ...................................................................... ............20 4.10 - 4.12 DISPOSAL OF EXCESS SPOIL ...................................................................... ............23 4.13 CONTEMPORANEOUS RECLAMATION ..................................................... ............23 • 4.14 BACKFILLING AND GRADING ...................................................................: ............23 4.14.1 General Requirements .................................................................................... ............23 4.14.2 General Grading Requirements ...................................................................... ............24 4.14.3 Covering Coal and Acid and Toxic Forming Materials .................................. ............25 4.14.4 Thin Overburden ............................................................................................. ............25 4.14.5 Thick Overburden ........................................................................................... ............25 4.14.6 Re-grading or Stabilizing Rills and Gullies .................................................... ............25 4.15 REVEGETATION REQUIREMENTS ............................................................. ............25 4.15.1 - 4.15.7 Revegetation Requirements, Various ............................................................. ............25 4.15.8 Revegetation Success Criteria ........................................................................ ............25 4.15.9 Cropland Revegetation Success ...................................................................... ............26 4.15.10 Previously Mined Land Revegetation Success Criteria .................................. ............26 4.16 POSTMINING LAND USE .............................................................................. ............26 4.16.1 General ............................................................................................................ ............26 4.16.2 Determining Use of Land ............................................................................... ............26 4.16.3 Alternative Land Uses .................................................................................... ............26 4.17 AIR RESOURCES PROTECTION ................................................................... ............27 4.18 PROTECTION OF FISH, WILDLIFE, AND RELATED VALUES ................ ............27 4.19 PROTECTION OF UNDERGROUND MINING ............................................. ............28 4.20 SUBSIDENCE CONTROL ............................................................................... ............28 4.21 COAL EXPLORATION .................................................................................... ............28 4.22 CONCURRENT SURFACE AND UNDERGROUND MINING .................... ............28 4.23 AUGER AND HIGHWALL MINING .............................................................. ............29 4.23.1 Scope .............................................................................................................. ............29 4.23.2 Maximize Recoverability of Mineral Reserves .............................................. ............29 4.24 OPERATIONS IN ALLUVIAL VALLEY FLOORS ....................................... ............29 South Taylor/LOwer Wuson -iii Revision Date: 3/30/07 Revision No.: PR-02