Waihi North Project Preliminary Site Investigation (Ground Contamination) Williamson Water & Land Advisory Limited iv Contents 1. Introduction....................................................................................................................................... 1 1.1 Background and project description .....................................................................................................................................1 1.2 Objectives and scope of this report ......................................................................................................................................2 1.3 Legislative requirements....................................................................................................................................................... 3 2. Site Description ................................................................................................................................ 5 2.1 Property identification ........................................................................................................................................................... 5 2.2 Site layout .............................................................................................................................................................................7 2.2.1 Processing Plant and Water Treatment Plant site (Existing) ................................................................................................ 9 2.2.2 Processing Plant and Water Treatment Plant (Proposed Expansion) ................................................................................ 13 2.2.3 Proposed Gladstone Open Pit ............................................................................................................................................ 15 2.2.4 Existing Tailings Storage Facilities .....................................................................................................................................17 2.2.5 Proposed Tailings Storage Facility 3 ..................................................................................................................................19 2.2.6 Proposed Northern Rock Stack ..........................................................................................................................................21 2.2.7 Willows Road property ........................................................................................................................................................ 24 2.2.8 Coromandel Forest Park..................................................................................................................................................... 26 2.3 Environmental setting ......................................................................................................................................................... 28 3. HAIL Assessment Summary ......................................................................................................... 30 3.1 Site history review methodology .........................................................................................................................................30 3.2 Processing Plant and Water Treatment Plant site .............................................................................................................. 31 3.3 Proposed Gladstone Open Pit ............................................................................................................................................ 34 3.4 Existing Tailings Storage Facilities .....................................................................................................................................36 3.5 Proposed Tailings Storage Facility 3 ..................................................................................................................................38 3.6 Proposed Northern Rock Stack ..........................................................................................................................................40 3.7 Willows Road property........................................................................................................................................................ 42 3.8 Coromandel Forest Park..................................................................................................................................................... 44 4. Preliminary Conceptual Site Model .............................................................................................. 45 5. Development Implications............................................................................................................. 47 5.1 Overview............................................................................................................................................................................. 47 5.2 Investigation requirements.................................................................................................................................................. 47 5.3 Consenting implications ...................................................................................................................................................... 48 5.3.1 NESCS ............................................................................................................................................................................... 48 5.3.2 Waikato Regional Plan ....................................................................................................................................................... 49 5.4 Earthworks requirements .................................................................................................................................................... 50 6. Conclusions .................................................................................................................................... 51 7. References ...................................................................................................................................... 52 Appendices: Appendix A: Site History Information Appendix B: Client Provided Information
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