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PERMFILE47910
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PERMFILE47910
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Last modified
8/24/2016 10:49:55 PM
Creation date
11/20/2007 1:21:12 PM
Metadata
Fields
Template:
DRMS Permit Index
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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2.0 Field Work <br />Field work was carried out by SubTerra, Inc. personnel between June 26, 1994 and July <br />2, 1994. The objectives of this work were to provide data on slope morphology, surface <br />characteristics, and block-size frequency-distribution, and also to verify the structural <br />assessment presented by SAIC in their 1992 report. <br />Specific tasks, which were carried out concurrently, included; <br />• mapping of slope morphology and surface characteristics, including slope <br />breaks, soil and vegetation type, and man-made features. <br />• compilation of a boulder catalog containing details of blocks from earlier <br />falls including location, approximate dimensions, source area (if <br />determinable), and failure mode (if determinable). <br />• review of SAIC stereographic projection data. <br />• scanline mapping to assess the spacing of the various discontinuity sets <br />present. <br />Features were recorded in the field on 1" to 200' ortho-photographs provided by <br />Twentymile Coal Company, and were located on the photographs by direct inspection, or <br />by intersection of compass bearings. The accuracy of the resulting plots is consistent with <br />these methods. <br />2.1 Slope Morphological Mapping <br />Morphological features were recorded to supplement Twentymile Coal Company's 1" to <br />200' topographic mapping and to aid in developing CRSP models. Features of interest <br />included upper and lower breaks of slope, cliff base and crest lines, and man-made <br />features such as levelled areas, drainage ditches, and cat roads. Several of the recorded <br />
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