Bulga Coal Plan BULGA COAL WATER MANAGEMENT PLAN EPBC APPROVAL 2012/6637 Table of Contents Bulga Coal Water Management Plan ............................................................................................ 1 Declaration of accuracy ......................................................................................... 3 1. INTRODUCTION ............................................................................................................. 4 1.1 Purpose ..................................................................................................................................... 4 1.2 Scope ........................................................................................................................................ 5 1.3 Objectives .................................................................................................................................. 5 2. PLANNING REQUIREMENTS ............................................................................................. 7 2.1 Overview .................................................................................................................................... 7 2.2 Development Consent Conditions .................................................................................................. 7 2.3 Mining Leases ........................................................................................................................... 16 2.31 Mining Lease (ML 1547) ............................................................................ 16 2.32 Mining Lease (ML 1494) ............................................................................ 16 2.33 Mining Lease (ML 1674) ............................................................................ 17 2.34 Mining Lease (CL 224) .............................................................................. 18 2.4 Exploration Licences .................................................................................................................. 18 2.41 Exploration Licences A450, A447, EL5461, and EL5277 ................................. 18 2.5 Licences ................................................................................................................................... 19 2.51 Environmental Protection Licence ............................................................... 19 2.52 Groundwater Licences ............................................................................... 19 2.53 Surface Water Licences ............................................................................. 19 3. EXISTING SITE OVERVIEW ............................................................................................ 23 3.1 Introduction ............................................................................................................................. 23 3.2 Hydrology ................................................................................................................................ 25 3.3 Geology and Hydrogeology ......................................................................................................... 25 4. WATER MANAGEMENT PRINCIPLES ................................................................................. 26 4.1 General .................................................................................................................................... 26 4.2 Water Management Classes, Design Objectives and Performance Criteria ......................................... 26 4.3 Current Operational Philosophy ................................................................................................... 27 5. EXISTING WATER MANAGEMENT SYSTEM ....................................................................... 28 5.1 Clean Water Management .......................................................................................................... 28 5.2 Mine Water Management ............................................................................................................ 28 5.21 Underground Mine Water Management........................................................ 31 5.22 Open Cut Pit Water Management ................................................................ 31 5.23 CHPP Water Management .......................................................................... 31 5.3 Controlled Discharges ................................................................................................................ 32 5.31 Discharges via Licenced Discharge Points .................................................... 32 5.32 Future Licenced Discharge Point ................................................................. 32 6. FUTURE WATER MANAGEMENT DEVELOPMENTS ............................................................... 33 6.1 General .................................................................................................................................... 33 6.2 Year 1 ...................................................................................................................................... 34 6.3 Year 4 ...................................................................................................................................... 36 BUL SD PLN 0052 (EPBC) Status: Approved Effective: 22/02/2017 Page 1 of 72 BULGA COAL WATER MANAGEMENT PLAN Version: 1.0 Review: 22/02/2020 THIS DOCUMENT IS UNCONTROLLED UNLESS VIEWED ON THE INTRANET Bulga Coal Plan 7. SITE WATER BALANCE .................................................................................................. 38 7.1 Model Overview ........................................................................................................................ 38 7.2 Overall Site Water Balance Model Results ..................................................................................... 42 7.21 Water Supply Reliability ............................................................................ 43 7.22 Controlled Releases .................................................................................. 45 7.23 Hunter River Extraction ............................................................................. 46 7.3 Water Efficiency ........................................................................................................................ 47 7.4 Water Balance Monitoring ........................................................................................................... 47 7.5 Water Balance Model Review ...................................................................................................... 48 8. EROSION AND SEDIMENT CONTROL ............................................................................... 49 8.1 BCC Operations ......................................................................................................................... 49 8.2 BOP Construction Phase ............................................................................................................. 50 9. SURFACE WATER MONITORING PROGRAM ...................................................................... 51 9.1 Baseline Data ........................................................................................................................... 51 9.11 Surface Water Quality ............................................................................... 51 9.12 Mine Water Quality ................................................................................... 52 9.13 Streamflow .............................................................................................. 52 9.2 Surface Water Impact Assessment Criteria ................................................................................... 53 9.3 Surface Water Monitoring ........................................................................................................... 54 9.31 Surface Water Quality ............................................................................... 54 9.32 Onsite Mine Water Quality Monitoring ......................................................... 55 9.33 Stream Health and Channel Stability........................................................... 55 9.34 Private Dams ........................................................................................... 56 10. GROUNDWATER MONITORING PROGRAM ........................................................................ 57 10.1 Groundwater Monitoring Network ................................................................................................ 57 10.2 Baseline Data ........................................................................................................................... 57 10.21 Groundwater Inflows into the Open Cut ................................................... 59 10.3 Groundwater Impact Assessment Criteria ..................................................................................... 59 10.4 Groundwater Monitoring ............................................................................................................. 61 10.41 Groundwater inflows into the Open Cut Pit ............................................... 62 10.42 Seepage from water storages, emplacements and voids ............................. 62 10.43 Regional and local aquifers ..................................................................... 62 10.44 Groundwater supply in privately owned bores ........................................... 63 10.45 Groundwater Dependent Ecosystems ....................................................... 63 10.46 Wollombi Brook