Chapter 14 Groundwater
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CHAPTER NORTH STAR TO NSW/QUEENSLAND BORDER ENVIRONMENTAL IMPACT STATEMENT NORTH STAR TO NSW/QUEENSLAND BORDER ENVIRONMENTAL IMPACT STATEMENT i Contents 14. GROUNDWATER 14-1 14.1 Scope of chapter 14-1 14.1.1 Requirements 14-1 14.2 Legislation, policies, standards and guidelines 14-3 14.3 Methodology 14-6 14.3.1 Study area 14-6 14.3.2 Assessment methodology 14-6 14.3.3 Staged assessment approach 14-8 14.3.4 Data sources 14-9 14.4 Existing environment 14-9 14.4.1 Existing hydrogeological understanding 14-10 14.4.2 Registered groundwater bores 14-13 14.4.3 Groundwater levels 14-13 14.4.4 Vertical gradients and aquifer interaction 14-19 14.4.5 Groundwater quality 14-20 14.4.6 Surface water groundwater interactions 14-22 14.4.7 Groundwater dependent ecosystems 14-23 14.4.8 Groundwater use 14-27 14.4.9 Groundwater environmental values 14-28 14.5 Field investigations 14-33 14.5.1 Standpipe piezometer installation 14-34 14.5.2 Permeability testing 14-36 14.5.3 Groundwater level monitoring 14-36 14.5.4 Groundwater sampling 14-36 14.5.5 Summary of field investigations 14-37 14.6 Conceptual groundwater model 14-37 14.6.1 Recharge 14-38 14.6.2 Discharge 14-38 14.7 Potential impacts 14-39 14.7.1 Construction activities 14-39 14.7.2 Construction potential impacts 14-43 14.7.3 Operation potential impacts 14-47 14.8 Mitigation measures 14-47 14.8.1 Design considerations 14-47 14.8.2 Proposed mitigation measures 14-48 14.8.3 Groundwater management and monitoring program 14-52 14.9 Impact assessment 14-55 14.9.1 Temporary impacts 14-55 14.9.2 Long-term impacts 14-56 14.9.3 Significance assessment 14-56 14.10 Conclusions 14-61 ii INLAND RAIL Figures Table 14.15 Summary of construction methods and assumptions 14-39 Figure 14.1 Proposal location and hydrology 14-7 Table 14.16 Summary of proposed structures Figure 14.2a-d Registered bores within the and estimated groundwater level 14-39 groundwater study area 14-14 Table 14.17 Estimated water requirements and Figure 14.3 Piper plot for registered bores from potential water sources during the key aquifers within 10 km of the construction activities 14-42 northern portion of the study area 14-20 Table 14.18 North Star water supply bore Figure 14.4 Aquatic Groundwater dependent summary 14-43 ecosystems 14-24 Table 14.19 Borrow pit summary 14-44 Figure 14.5 Terrestrial Groundwater Table 14.20 Initial mitigations of relevance to dependent ecosystems 14-25 groundwater 14-47 Figure 14.6 Registered bore use within a 10 km Table 14.21 Proposed groundwater mitigation radius of the proposal site 14-28 measures 14-49 Figure 14.7 Conceptual hydrogeological model Table 14.22 Indicative pre-construction for the proposal 14-38 (baseline) Groundwater Figure 14.8 Timeline of estimated water use management and monitoring plan for the proposal 14-42 bore monitoring network for the proposal 14-53 Tables Table 14.23 Significance assessment summary for groundwater 14-57 Table 14.1 Assessment Requirements compliance 14-1 Table 14.2 Summary of legislation, policies, strategies or guidelines 14-3 Table 14.3 Classifications adopted for the significance assessment 14-8 Table 14.4 Data sources for the Groundwater study 14-9 Table 14.5 Summary of Lithostratigraphy for the Groundwater Study Area (Exon, 1976 and Ransley et al., 2015) 14-10 Table 14.6 Summary of alluvium characteristics and depth to the water bearing zone along the proposal alignment 14-10 Table 14.7 Vertical groundwater evaluation form nested bore data from the Border Rivers region 14-19 Table 14.8 Site investigation groundwater results obtained in October 2018 14-21 Table 14.9 Summary of aquatic groundwater dependent ecosystems 14-26 Table 14.10 Summary of terrestrial groundwater dependent ecosystems 14-26 Table 14.11 Summary of 2018 2019 water access licence allocations relevant to the groundwater study area 14-27 Table 14.12 Environmental water quality values relevant to groundwater for the Border Rivers Catchment 14-31 Table 14.13 Summary of site investigations completed in July to October 2018 14-33 Table 14.14 Site investigation proposal monitoring bores 14-35 NORTH STAR TO NSW/QUEENSLAND BORDER ENVIRONMENTAL IMPACT STATEMENT iii 14. Groundwater 14.1 Scope of chapter This chapter includes a description of the groundwater existing environment, environmental values, and impact assessment of the Inland Rail North Star to NSW/Queensland Border project (the proposal) on groundwater resources. The groundwater chapter summarises key aspects of the groundwater impact assessment with full details of the assessment provided in Appendix N: Groundwater Technical Report. The existing environment is described and the potential impacts of the proposal are assessed. Potential short- and long-term impacts on local and regional groundwater resources have been assessed for construction and operation phases. The results of the impact assessment and recommended mitigation measures are outlined. 14.1.1 Secretary s Environmental Assessment Requirements This chapter has been prepared to address the SEARs) as shown in Table 14.1. TABLE 14.1 SECRETARY S ENVIRONMENTAL ASSESSMENT REQUIREMENTS COMPLIANCE Item 9: Water Hydrology Desired Long-term impacts on surface water and groundwater hydrology (including drawdown, flow rates performance and volumes) are minimised. outcome The environmental values of nearby, connected and affected water sources, groundwater and dependent ecological systems including estuarine and marine water (if applicable) are maintained (where values are achieved) or improved and maintained (where values are not achieved). Sustainable use of water resources. Current Biodiversity Assessment Method Operational Manual Stage 1 (OEH, 2018) guideline Managing Urban Stormwater: Soils and Construction Volume 1 (Landcom, 2004) and Managing Urban Stormwater: Soils and Construction Volume 2 (A. Installation of Services; B. Waste Landfills; C. Unsealed Roads; D. Main Roads; E. Mines and Quarries) (DECC, 2008) NSW Aquifer Interference Policy (DPI, 2012a) NSW Sustainable Design Guidelines Version 4.0 (TfNSW, 2017) Risk Assessment Guidelines for Groundwater Dependent Ecosystems: Volume 1 the conceptual framework (Office of Water, 2012) SEARs requirement EIS section Item 9.1 Sections 14.4, The Proponent must describe (and map) the existing hydrological regime for any surface and 14.4.9.3 groundwater resource (including reliance by users and for ecological purposes) likely to be and 14.7 impacted by the project, including stream orders, as per the BAM. Item 9.2 Section 14.6 The Proponent must prepare a detailed water balance for ground and surface water including the proposed intake and discharge locations, volume, frequency and duration, sources, security and licensing requirements. Item 9.3 The Proponent must assess (and model if appropriate) the impact of the construction and operation of the project and any ancillary facilities (both built elements and discharges) on surface and groundwater hydrology in accordance with the current guidelines, including: a) natural processes within rivers, wetlands, estuaries, marine waters and floodplains that affect Sections 14.4, the health of the fluvial, riparian, estuarine or marine system and landscape health (such as 14.4.9.3, modified discharge volumes, durations and velocities), aquatic connectivity and access to 14.6 habitat for spawning and refuge; Section 14.7 b) impacts from any permanent and temporary interruption of groundwater flow, including the Sections 14.7 extent of drawdown, barriers to flows, implications for groundwater dependent surface flows, and 14.8 ecosystems and species, groundwater users and the potential for settlement; NORTH STAR TO NSW/QUEENSLAND BORDER ENVIRONMENTAL IMPACT STATEMENT 14-1 SEARs requirement EIS section c) changes to environmental water availability and flows, both regulated/licensed and Sections 14.7 unregulated/rules‐based sources; and 14.8 d) direct or indirect increases in erosion, siltation, destruction of riparian vegetation or a Chapter 13: reduction in the stability of river banks or watercourses; Surface Water and Hydrology e) minimising the effects of proposed stormwater and wastewater management during Sections 14.7 construction and operation on natural hydrological attributes (such as volumes, flow rates, and 14.8 management methods and re‐use options) and on the conveyance capacity of existing stormwater systems where discharges are proposed through such systems; and f) water take (direct or passive) from all surface and groundwater sources with estimates of Section 14.7 annual volumes during construction and operation. Item 9.4 Section 14.8.3 The Proponent must identify any requirements for baseline monitoring of hydrological attributes. Desired Item 10: Water Quality performance The project is designed, constructed and operated to protect the NSW Water Quality Objectives outcome where they are currently being achieved, and contribute towards achievement of the Water Quality Objectives over time where they are currently not being achieved, including downstream of the project to the extent of the project impact including estuarine and marine waters (if applicable). Current NSW Water Quality and River Flow Objectives at environment.nsw.gov.au/ieo/ guideline Using the Australian and New Zealand Guidelines for Fresh and Marine Water Quality (ANZ Guidelines) (Australian and New Zealand Governments and Australian state and territory governments, 2018) and Using the ANZECC Guidelines and Water Quality Objectives in NSW (DEC, 2006) Australian and New Zealand Guidelines for Fresh and