PERMFILE47910

• Permit No: C1982056
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: & Predication of Subsidence Southwestern District /3/14/94
• Section_Exhibit Name: Exhibit 07f Rockfall Hazard Assessment and Selection of Hazard Control or Mitigation Measures
• Media Type: D
• Archive: No

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List of Figures
Figure Page
No. No.
2-1 Stereoplot of Twentymile Sandstone Discontinuity Data 12
3-1 Cumulative Distribution of Block Volume 16
4-1 Alternative Catchment Area/Berm Configurations 23
4-2 Example of CRSP Output Summary 24
List of Tables
• Table Page
No. No.
2-1 Twentymile Coal Company - Rockfall Hazard Analysis -Boulder Catalog 9
3-1 Summary of Scanline Survey Data 14
3-2 Surface Descriptions for Tangential Coefficient Selection 17
3-3 Surface Descriptions for Restitution Coefficient Selection 17
3-4 CRSP Parameter Ranges for Representative Site Conditions 18
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