EGL Ref: 9018 22 June 2022 Page iv WAI-985-000-REP-LC-0006_Rev0.docx This report shall only be read in its entirety. 8.3. Permanent surface water collection systems 14 8.4. Northern Rock Stack Collection Pond sizing 14 9.0 DEVELOPMENT OF THE NORTHERN ROCK STACK 14 9.1. Design concepts 14 9.2. Northern Rock Stack zonation 16 9.3. Subsurface drainage 17 9.4. Stockpile base liner system 17 9.5. Leachate collector drainage 17 9.6. Northern Uphill Diversion Drain and stream diversion 17 9.7. Surface water 17 9.8. Northern Rock Stack Collection Pond 18 9.9. Northern Rock Stack stockpiles 18 9.10. Construction aspects 19 9.11. Closure Plan 21 10.0 DESIGN ASSESSMENT 21 10.1. Stability 21 10.2. Seepage 22 10.3. Northern Uphill Diversion Drain and stream diversion 22 10.4. Surface water collection system 23 10.5. Northern Rock Stack Collection Pond 23 11.0 DRAWINGS 23 12.0 CONSTRUCTION MANAGEMENT 24 13.0 EROSION AND SEDIMENT CONTROL 24 14.0 OPERATION MAINTENANCE AND SURVEILLANCE 25 15.0 CONSENTING REQUIREMENTS 25 15.1. Northern Rock Stack – stockpile and infrastructure 26 15.2. Northern Rock Stack Collection Pond 27 15.3. Workshop relocation 27 15.4. Magazine platform 27 16.0 SUMMARY OF POTENTIAL RISKS AND MITIGATION MEASURES 27 17.0 CONCLUSIONS 28 TABLE 1 TO 7 FIGURES 1 TO 20 APPENDIX A – DRAWINGS APPENDIX B – STABILITY ANALYSES
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