Galilee Energy Limited Glenaras Aquifer Injection Management Plan - Hutton Sandstone 28 July 2020 - RevD RDM Hydro Pty Ltd RDM_GLL_GlenarasHuttonIMP_RevD ABN 83 624 788 870 0 3 February 2020 - RevA www.rdmhydro.com.au Glenaras Aquifer Injection Management Plan - Hutton Sandstone Table of Contents 1. Introduction ............................................................................................................... 2 2. Regulatory Context ................................................................................................... 3 2.1. Petroleum & Gas (Production & Safety) Act 2004 ................................................ 3 2.2. Environmental Protection Act 1994 ...................................................................... 3 2.3. CSG Water Management Policy ........................................................................... 4 2.4. Water Act 2000 ..................................................................................................... 4 2.5. Water (Great Artesian Basin and Other Regional Aquifers) Plan ......................... 5 2.6. Environmental Protection (Water) Policy 2009 ..................................................... 5 2.7. Environment Protection and Biodiversity Conservation Act (1999) ...................... 6 2.8. Great Artesian Basin Sustainability Initiative ........................................................ 7 2.9. GAB Springs Recovery Plan ................................................................................ 7 3. Site location and description ................................................................................... 9 4. Hydrogeological conditions ................................................................................... 13 4.1. Geology and hydrostratigraphy .......................................................................... 13 4.2. Hydraulic properties ............................................................................................ 19 4.3. Fracture pressure ............................................................................................... 22 4.4. Groundwater levels and flow directions .............................................................. 22 4.4.1. Hutton Sandstone - temporal water level changes....................................... 22 4.4.2. Hutton Sandstone - flow directions .............................................................. 22 4.5. Groundwater quality ........................................................................................... 25 4.6. Groundwater users ............................................................................................. 29 4.6.1. Bores ........................................................................................................... 29 4.6.2. Groundwater dependent ecosystems .......................................................... 32 5. Environmental values ............................................................................................. 36 6. Produced water ....................................................................................................... 38 7. Injection system ...................................................................................................... 41 7.1. Injection bores .................................................................................................... 41 7.2. Injectant treatment system ................................................................................. 42 7.3. Trial Operation .................................................................................................... 45 7.3.1. Emergency Planning and Response ............................................................ 45 7.3.2. Non-compliance response ........................................................................... 46 8. Potential impacts .................................................................................................... 47 RDM Hydro Pty Ltd RDM_GLL_GlenarasHuttonIMP_RevD ABN 83 624 788 870 i 23 April 2020 - RevB www.rdmhydro.com.au Glenaras Aquifer Injection Management Plan - Hutton Sandstone 8.1. Hydraulic impacts ............................................................................................... 48 8.1.1. Method ......................................................................................................... 48 8.1.2. Predicted extent of the hydraulic impact zone ............................................. 48 8.1.3. Predicted hydraulic impacts ......................................................................... 49 8.2. Water quality impacts ......................................................................................... 52 8.2.1. Method ......................................................................................................... 52 8.2.2. Predicted extent of the water quality impact zone ........................................ 52 8.2.3. Predicted water quality impacts ................................................................... 53 8.2.4. Geochemical compatibility ........................................................................... 55 9. Monitoring ............................................................................................................... 57 9.1. Locations ............................................................................................................ 57 9.2. Flow and pressure monitoring ............................................................................ 57 9.2.1. Injection system ........................................................................................... 57 9.2.2. Monitoring bores .......................................................................................... 57 9.3. Water quality monitoring ..................................................................................... 58 9.3.1. Injectant ....................................................................................................... 58 9.3.2. Injection bores .............................................................................................. 58 9.3.3. Monitoring bores .......................................................................................... 58 9.3.4. Analytical parameters .................................................................................. 59 9.4. Reporting ............................................................................................................ 60 9.4.1. Flow and pressure ....................................................................................... 60 9.4.2. Water quality ................................................................................................ 60 9.4.3. Technical feasibility assessment .................................................................. 61 10. Public consultation .............................................................................................. 62 11. Risk assessment .................................................................................................. 63 12. References ........................................................................................................... 74 Appendix 1 – Detailed site-specific Hutton Sandstone water quality data ............... 76 Appendix 2 – Detailed produced water quality data ................................................... 77 RDM Hydro Pty Ltd RDM_GLL_GlenarasHuttonIMP_RevD ABN 83 624 788 870 ii 28 July 2020 - RevD www.rdmhydro.com.au Glenaras Aquifer Injection Management Plan - Hutton Sandstone Tables Table 1 Geological and hydrogeological summary for the Glenaras injection site (after Galilee, 2016) .......................................................................................................................................... 15 Table 2 Hydraulic properties of the Hutton Sandstone from GLL water bore monitoring flow tests ................................................................................................................................................... 20 Table 3 Porosity of the Hutton Sandstone at the site .................................................................. 20 Table 4 Site specific target aquifer groundwater quality .............................................................. 27 Table 5 Environmental values and water quality objectives ........................................................ 36 Table 6 Produced water quality .................................................................................................. 39 Table 7 Trial injection bores ....................................................................................................... 42 Table 8 Injection bore construction ............................................................................................. 42 Table 9 Treatment plant set points and compliance limits ........................................................... 43 Table 10 Monitoring locations and summary of scope ................................................................ 57 Table 11 Schedule of bore sampling and analysis ...................................................................... 58 Table 12 Measures of likelihood and consequence for risk assessment ..................................... 64 Table 13 Risk matrix based on the categories in Table 12 .......................................................... 64 Table 14 Environmental risk assessment ................................................................................... 65 Figures Figure 1 Site location .................................................................................................................