REV00831

• Permit No: M1980244
• IBM Index Class Name: Revision
• Doc Name: VOLUME V TABLE OF CONTENTS
• Type & Sequence: AM8
• Media Type: D
• Archive: No

III IIIIIIIIIIIIIIII
999
Mazch 2000 -i- 993-2099.150
• VOLUME V
TABLE OF CONTENTS
EXECUTIVE SUMMARY .............................................................................1
1.0 INTRODUCTION ..................................................................................1
1.1 Project Description ............................................................................ 3
1.2 Scope of Work ................................................................................. 5
1.3 Design Criteria .................................................................................7
2.0 SITE DESCRIPTION ............................................................................ 15
2.1 Location and Topography .................................................................. 15
2.2 Climate ........................................................................................ 15
2.3 Geology ........................................................................................ 17
2.4 Underground Workings ..................................................................... 18
2.4.1 Remediation of Underground Workings Within Limits of Phase II and
Phase III Areas ....................................................................... 18
2.4.2 Remediation of Underground Workings Within Limits of Phase IV ....... 19
• 2.5 Seismicity ..................................................................................... 22
3.0 SITE SUBSURFACE CONDITIONS ......................................................... 23
3.1 Previous Site Investigations ................................................................ 23
3.2 Golder Site Investigation ................................................................... 23
3.3 Site Geotechnical Conditions .............................................................. 24
4.0 VALLEY LEACH FACILITY DESIGN .............................. ....................... 26
4.1 General ................................................................. .......................26
4.2 Site Layout ............................................................. ....................... 27
4.3 Staged Construction .................................................. ....................... 28
4.4 Valley Leach Facility Foundation .................................. ....................... 28
4.5 Underdrains ............................................................ ....................... 30
4.6 Liner System ........................................................... ....................... 31
4.6.1 Ore Storage Area ............................................. ....................... 31
4.6.2 Phase IV PSSA ................................................ ....................... 32
4.6.3 External Ponds ................................................ ....................... 34
4.6.3.1 Phase I/II/III External Pond ......................... ....................... 34
4.6.3.2 Phase IV Extetal Pond ............................. ....................... 34
4.7 Leak Detection System .............................................. ....................... 35
4.7.1 Phase IV VLF ................................................. ....................... 35
. 4.7.2 Phase 1V External Pond ..................................... ....................... 35
1:\97~1099\FlNAL REPORT3099MAIN3.DOC Golder Associates