PERMFILE135086

• Permit No: C1981038
• IBM Index Class Name: Permit File
• Doc Date: 12/11/2001
• Doc Name: Geotechnical Review
• Section_Exhibit Name: Volume 6 PHASE I STABILITY ANALYSES Appendix
• Media Type: D
• Archive: No

TABLE OF CONTENTS
•
PAGE:
1.0 INTRODUCTION 1
1.1 GENERAL 1
1.2 SCOPE OF GEOTECHNICAL REVIEW 2
1.3 PREVIOUS STUDIES 3
2.0 SITE CONDITIONS 3
2.1 GEOLOGY AND HYDROLOGY 3
2.2 ORCHARD VALLEY MINE SURFACE FACILITIES 5
2.3 GEOTECHNICAL PIAPPING OF THE AREA 5
2.4 ROCK STRUCTURE 6
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3.0 GEOLOGICAL HAZARDS OF THE SITE 7
3.1 LANDSLIDES 7
3.2 POTENTIALLY UNSTABLE SLOPES 8
3.3 ROCKFALL 8
3.4 EXPANSIVE SOIL AND ROCK 8
3.5 SHEET FLOW FLOODING AND EROSION 9
4.0 PRESENT INTEGRITY OF MINE SURFACE FACILITIES 9
4.1 GENERAL 9
4.2 DIVERSION DITCH CUT 10
4.3 ROCK CUTS 12
4.4 SOIL CUTS 14
4.5 MAN-MADE FILLS 15
4.6 SLIDE AT SEDIMENTATION POND N0. 4 17
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GEOMYOQO CON9lUNC, INC.