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PERMFILE129986
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PERMFILE129986
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Last modified
8/24/2016 10:30:56 PM
Creation date
11/25/2007 8:30:53 PM
Metadata
Fields
Template:
DRMS Permit Index
Permit No
C1982056
IBM Index Class Name
Permit File
Doc Date
12/11/2001
Section_Exhibit Name
EXHIBIT 07a STABILITY INVESTIGATION OF THE TWENTYMILE SANDSTONE CLIFF
Media Type
D
Archive
No
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~ TABLE OF CONTENTS <br />~• 1.C INTRODUCTION .............................. <br /> 2.0 GENERAL GEOLOGIC SETTING ............................. 2 <br /> 2 1 G~nera~ Srntipraphy ................................ . 2 <br /> 2.2 Geneva] Stn~ctural Geology ............................ . 3 <br /> ' <br /> 3,0 ENGI EERI'VG GEfiLOriY ................................ <br />)\ . 4 <br /> 3.1 General ........................................ .4 <br /> 3.2 . <br />Engineering Geologic Hazard Zones . 4 <br /> 3.3 ::::::::::::::::::::: <br />Twentymile Sandstone ....... . . 5 <br /> 3.3.1 Potential Hazards ........................... . 7 <br /> 3.4 Faults ............... .7 <br /> .......................... <br />3.4.1 Potential Hazards . 8 <br /> 3.5 Joints ..............................:.......... .9 <br /> 3.5.1 Potential Hazards ............. 10 <br /> 3.6 ::::::::::::: <br />Toppling, Arcuate, Planar, and Wedge Failures 11 <br /> 3.7 Debris Flows .................................... 13 <br />_~ 4.0 JOINT MAPPING ...................................... 15 <br /> 4.1 Field Work ..................................... 15 <br />{ 4.2 Statistical Validity of Data ............................ 16 <br />• <br />1 4.3 Analysis of Fabric Data .............................. 16 <br /> 4.3.1 All Zones ................................ 17 <br /> 4.3.2 Zones 1-4 ................................ 17 <br /> 4.3.3 ZoneS .................................. 18 <br /> 4.3.4 Zone6 .................................. 18 <br />J 5.0 STABILITY ANALYSIS .................................. 19 <br /> 5.1 General Approach ................................. 19 <br /> 5.2 Material Properties ................................. 19 <br /> 5.3 Analysis of Each Zone .............................. 20 <br /> 5.3.1 Zone 1 . <br />. 20 <br />I 5.3.2 Zone 2 <br />................................ 21 <br /> 5.3.3 Zones 3 and 4 ............................. 21 <br /> 5.3.4 Zone 5 .................................. 21 <br />J 5.3.5 Zone 6 .................................. 22 <br /> 5.4 Effects of Mining on Existing Surface Conditions .............. 22 <br />t 5.4.1 Surface Subsidence .......................... 23 <br />5.4.2 Ground Cracking ............................ 23 <br />5.4.3 Slip Along Faults ........................... 23 <br />J• i <br />
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