2008-03-03_PERMIT FILE - C2006085A ‎(4)‎

• Permit No: C2006085A
• IBM Index Class Name: Permit File
• Doc Date: 3/3/2008
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Exhibit V
• Media Type: D
• Archive: Yes

TABLE OF CONTENTS
Section Pale No•
1.0 INTRODUCTION .....................................................................................................1
2.0 HYDROLOGIC CALCULATIONS ......................................................................... 1
2.1 Storm Type .................................................................................................... 2
2.2 Design Storm ................................................................................................ 2
2.3 Rainfall Depth ................................................................................................ 2
2.4 NRCS Distribution Resolution ...................................................................... 2
2.5 Subwatershed Area ........................................................................................ 3
2.6 Time of Concentration ................................................................................... 3
2.7 Muskingum Routing ..................................................................................... 3
2.8 Curve Number ................................................................................................ 3
2.9 Hydrograph Response Shape ......................................................................... 4
3.0 SEDIMENTATION CALCULATIONS ................................................................... 4
3.1 Particle Size Distribution ............................................................................... 4
3.2 RULSE Annual R Factor ............................................................................... 5
3.3 Erodibility Factor ........................................................................................... 5
3.4 Length Slope (I.,S) Factor .............................................................................. 5
3.5 C Factor ......................................................................................................... 5
3.6 P Factor ......................................................................................................... 5
4.0 DIVERSION AND COLLECTION DITCHES ........................................................ 5
5.0 SEDIMENT POND ................................................................................................... 7
6.0 CHANDLER CREEK CROSSING ........................................................................... 7
7.0 TOPSOIL STOCKPILE ............................................................................................. 9
8.0 MINE VENT FAN ACCESS AREA ........................................................................ 9
~ Tables
Table 1: Northfield Project Curve Numbers ............:................................................4
' Table 2: Northfield Project Ditch Design Summary ....:::::::::::::::::::::::::::::::::::::::::::•• 6
Table 3: Northfield Project Sediment Pond Summary •• 8
Sheets
Appendices
Sheet 1: Site Drainage Map
Sheet 2: Sediment Pond Details
Appendix A: NOAA Atlas Maps
Appendix B: SEDCAD4 Printouts