2009-04-29_PERMIT FILE - C1982056 ‎(3)‎

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 4/29/2009
• Doc Name: ‎(refer to Figures EX49R-F3 and F4)‎
• Section_Exhibit Name: Exhibit 08DD 18-Left Mine Ventilation Shaft Installation Drainage Designs ‎(TR66)‎
• Media Type: D
• Archive: No

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Table of Contents
Introduction ............................................................................................................................................... I
Pond Design ..............................................................................................................................................1
Pond 1 ....................................................................................................................................................2
Pond 2 ....................................................................................................................................................2
SEDCAD Modeling ..................................................................................................................................3
Scenario 1: During Construction .........................................................................................................3
Scenario 2: After Construction ..............................................................................................................4
Summary of SEDCAD Modeling ..........................................................................................................6
Construction Specifications .......................................................................................................................7
Summary of BMPs ....................................................................................................................................8
• Summary ...................................................................................................................................................8
Certification ...................................................................................................................................................9
List of Tables
Table 1. Scenario 1 SEDCAD Inputs ............................................................................................................3
Table 2. Scenario 2 SEDCAD Inputs ............................................................................................................4
Table 3. Pond 1 Elevation-Area-Capacity .....................................................................................................4
Table 4. Pond 2 Elevation-Area-Capacity .....................................................................................................5
Table 5. SEDCAD Pond Output During Construction ..................................................................................7
Table 6. SEDCAD Pond Output After Construction .....................................................................................7
Twentytmile Coal Company 18L Shaft Pad i Water & Earth Technologies, Inc.
Drainage and Sediment Control System Design March 2, 2009