2010-05-07_PERMIT FILE - C2006085 ‎(7)‎

• Permit No: C2006085
• IBM Index Class Name: Permit File
• Doc Date: 5/7/2010
• Doc Name: Drainage and Sediment Control Plan
• Section_Exhibit Name: Exhibit V
• Media Type: D
• Archive: No

TABLE OF CONTENTS
is
Section Page No.
PREFACE....................................................................................................... ..............................1
1.0 INTRODUCTION .......................................................................................... ............................... I
2.0 HYDROLOGIC CALCULATIONS.
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 ...........................................................
............................... 3
3.0 SEDIMENTATION CALCULATIONS .........................................................
..............................4
3.1
Particle Size Distribution ...................................................................
..............................4
3.2
RULSE Annual R Factor ...................................................................
..............................4
3.3
Erodibility Factor ...............................................................................
..............................4
3.4
Length Slope (LS) Factor ..................................................................
..............................5
3.5
C Factor .............................................................................................
..............................5
3.6
P Factor .............................................................................................
..............................5
• 4.0 DIVERSION AND COLLECTION DITCHES .............................................. ..............................5
5.0 SEDIMENT POND ......................................................................................... ..............................6
6.0 CHANDLER CREEK ..................................................................................... ..............................7
6.1 Chandler Creek Floodplain ............................................................... ............................... 7
6.2 Access Road Crossing ...................................................................... ............................... 7
7.0 TOPSOIL STOCKPILES ................................................................................ ..............................9
8.0 MINE VENT FAN ACCESS AREA .............................................................. ..............................9
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
Appendix C: Chandler Creek FEMA Flood Insurance Rate Map
•