CONTENTS 1. OVERVIEW ................................................................................................ 3 1.1. Scope ......................................................................................................................... 3 2. DESCRIPTION OF WORKS........................................................................... 5 2.1. Surface Facilities Area................................................................................................. 6 2.2. Wharekirauponga Underground Mine ........................................................................ 6 2.3. Willows Rock Stack..................................................................................................... 7 2.4. Topsoil Stockpile ........................................................................................................ 8 2.5. Magazine Storage Area and Access Road .................................................................... 8 2.6. Utility Corridor ........................................................................................................... 9 3. EROSION AND SEDIMENT CONTROL DETAILS ............................................ 9 3.1. Clean Water Diversions .............................................................................................10 3.2. Dirty Water Diversions ..............................................................................................11 3.3. Sediment Retention Ponds ........................................................................................12 3.4. Decanting Earth Bunds ..............................................................................................13 3.5. Chemical Treatment ..................................................................................................13 3.6. Silt Fences and Super Silt Fences................................................................................13 3.7. Stabilisation ..............................................................................................................13 3.8. Dust Management.....................................................................................................14 3.9. Dewatering and Pumping ..........................................................................................14 3.10. General .....................................................................................................................14 3.11. Monitoring and Maintenance ....................................................................................14 4. APPENDIX ............................................................................................... 15 4.1. Appendix A – Erosion and Sediment Control Design Details .......................................15 4.2. Appendix B - Erosion and Sediment Control Drawings................................................20
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