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Chapter 16 Surface Water Transport for NSW/Sydney Airport Corporation Limited Sydney Gateway Road Project Environmental Impact Statement/ Major Development Plan Chapter 16 Surface water 2020 Environmental Impact Statement / Major Development Plan Contents 16. Surface water .................................................................................................................................... 16.1 16.1 Assessment approach ............................................................................................................. 16.1 16.2 Existing environment ............................................................................................................... 16.5 16.3 Assessment of construction impacts ..................................................................................... 16.12 16.4 Assessment of operation impacts .......................................................................................... 16.19 16.5 Cumulative impacts ............................................................................................................... 16.23 16.6 Management of impacts ........................................................................................................ 16.24 Tables Table 16.1 Pollutant reduction targets for Botany Bay catchment ........................................................ 16.5 Table 16.2 Existing annual pollutant loads ............................................................................................ 16.9 Table 16.3 Comparison of baseline water quality and default trigger values ...................................... 16.10 Table 16.4 Potential water quality impacts during construction .......................................................... 16.17 Table 16.5 Existing versus operational flow from impervious surface area in the project site ............ 16.19 Table 16.7 Modelling results for operational water quality .................................................................. 16.21 Table 16.8 Surface water mitigation measures ................................................................................... 16.27 Table 16.9 Residual impacts – surface water ..................................................................................... 16.28 Figures Figure 16.1 Catchments and watercourses ............................................................................................ 16.6 Figure 16.2 Surface water sampling locations ........................................................................................ 16.9 Chapter 16 Surface water This chapter describes the existing surface water environment, including hydrological conditions and water quality, identifies potential impacts during construction and operation, and provides measures to mitigate and manage the impacts identified. Further information is provided in Technical Working Paper 8 (Surface Water). The SEARs relevant to hydrology and surface water quality are listed below. There are no MDP requirements specifically relevant to surface water, however there is a requirement under section 91(1) of the Airports Act to assess the potential environmental impacts associated with a development (section 91(1)(h)), and to specify how those impacts may be dealt with (section 91(1)(j)). Full copies of the SEARs and MDP requirements, and where they are addressed in this document, are provided in Appendices A and B respectively. Reference Requirement Where addressed Key issue SEARs 10 Water – hydrology 10.1 The Proponent must describe (and map) the existing Section 16.2 and Figure 16.1 hydrological regime for any surface and groundwater resource Key resources described in the (including reliance by users and for ecological purposes) likely to BAM are also considered in be impacted by the proposal, including rivers, streams, estuaries Chapter 22 (Biodiversity) and wetlands as described in the BAM. 10.2 The Proponent must prepare a detailed water balance for Sections 16.3.1 (construction) and ground and surface water including the proposed intake from all 16.4.1 (operation) water supply options and discharge locations (including figures showing these locations), volume, frequency, duration and proposed water conservation and reuse measures for both the construction and operation of the proposal. 10.3 The Proponent must assess (and model if appropriate) the impact of the construction and operation of the proposal 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 Sections 16.3.1, 16.3.2 (for waters and floodplains that affect the health of the fluvial, construction impacts) and 16.4.1 riparian, estuarine or marine system and landscape health and 16.4.2 (for operation impacts) (such as modified discharge volumes, durations and Impacts on aquatic ecology are velocities), aquatic connectivity and access to habitat for considered in Chapter 22 spawning and refuge; (c) changes to environmental water availability and flows, both Not relevant to this project regulated/licensed and unregulated/rules-based sources (d) direct or indirect increases in erosion, siltation, destruction Sections 16.3.1, 16.3.2 and of riparian vegetation or a reduction in the stability of river 16.4.1, 16.4.2 banks or watercourses; Impacts on riparian vegetation are also considered in Chapter 22 (e) minimising the effects of proposed stormwater and Sections 16.3.1 and 16.4.1 wastewater management during construction and operation on natural hydrological attributes (such as volumes, flow rates) and on the conveyance capacity of the existing stormwater systems where discharges are proposed through such systems; and Reference Requirement Where addressed (f) water take (direct or passive) from all surface and No water take (direct or passive) groundwater sources with estimates of annual volumes of surface water is proposed. during construction and operation. Expected groundwater take is identified in section 15.4.3 10.4 The Proponent must identify any requirements for baseline No monitoring of hydrological monitoring of hydrological attributes. attributes (Alexandra Canal or Mill Stream) are considered necessary. Baseline water quality monitoring is recommended in section 16.6.1 10.5 The assessment must include details of proposed surface and Section 16.6.1 groundwater monitoring 11 Water - quality 11.1 (a) Describe the background conditions for any surface and Section 16.2.3 (surface water). groundwater resources likely to be affected by the proposal Groundwater conditions and including leachate from Tempe Tip; leachate from the former Tempe landfill are considered in Chapter 15 (Groundwater) and Technical Working Paper 16 – Landfill Assessment respectively (b) state the ambient NSW Water Quality Objectives (NSW Section 16.1.4 and Table 16.1 WQO) and environmental values for the receiving waters Appendix B, Technical Working relevant to the proposal, including the indicators and Paper 8 – Surface Water associated trigger values or criteria for the identified environmental values; (c) identify and estimate the quality and quantity of all Sections 16.3.1, 16.3.2 16.4.1 and pollutants that may be introduced into the water cycle by 16.4.2 source and discharge point and describe the nature and degree of impact that any discharge(s) may have on the receiving environment, including consideration of all pollutants (including contaminated groundwater) that pose a risk of non-trivial harm to human health and the environment; (d) assess the impacts of leachate generation from proposal Sections 16.3.2 and 16.4.2 related activities on the Tempe Tip site and proposed measures for managing potential impacts during construction and operation; (e) describe the proposed measures for treating and disposing Sections 16.1.4, 16.3.1 and 16.4.1 of construction and operational wastewater flows; (f) identify the rainfall event that the water quality protection Section 7.10.8 measures will be designed to cope with; (g) assess the significance of any identified impacts including Sections 16.3 and 16.4 consideration of the relevant ambient water quality outcomes; (h) demonstrate how construction and operation of the Sections 16.3.2 and 16.4.2 proposal will, to the extent that the proposal can influence, ensure that: where the NSW WQOs for receiving waters are currently being met they will continue to be protected; and where the NSW WQOs are not currently being met, activities will work toward their achievement over time; (i) justify, if required, why the WQOs cannot be maintained or Sections 16.3.2 and 16.4.2 achieved over time; (j) demonstrate that all practical measures to avoid or Section 16.6 minimise water pollution and protect human health and the environment from harm are investigated and implemented Reference Requirement Where addressed (k) identify sensitive receiving environments (which y include Sections 16.2.3 (identification of estuarine and marine waters downstream) and develop a sensitive receiving environments) strategy to avoid or minimise impacts on these and 16.6 (strategy to minimise environments; and impacts) (l) identify proposed monitoring locations, monitoring Section 16.6.1 frequency and indicators of surface and groundwater Existing groundwater quality is quality discussed in Chapter 15 (Groundwater) 11.2 The assessment should consider the results of any current water Sections 16.1.2, 16.1.4 and 16.2.3 quality studies, as available, for the catchment areas traversed
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