Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report
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Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report Ecological_Assessment_Report Issue | 27 August 2020 This report takes into account the particular instructions and requirements of our client. It is not intended for and should not be relied upon by any third party and no responsibility is undertaken to any third party. Job number 267007 Arup Pty Ltd ABN 18 000 966 165 Arup Level 4, 108 Wickham Street Fortitude Valley QLD 4006 GPO Box 685 Brisbane QLD 4001 Australia www.arup.com Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report Contents Page Executive summary 1 1 Introduction 3 1.1 Project overview 3 1.2 Project description 3 1.3 Purpose of the report 4 1.4 Limitations and assumptions 5 2 Policy context and legislative framework 6 2.1 Commonwealth 6 2.2 Territory 6 3 Methodology 9 3.1 Study area 9 3.2 Desktop studies 11 3.3 Terrestrial field surveys 11 3.4 Aquatic habitat assessments 17 3.5 Summary of surveys 18 4 Existing conditions 19 4.1 Site context 19 4.2 Recent fire 21 4.3 Vegetation and flora 21 4.4 Fauna 35 4.5 Aquatic habitat 54 5 Biodiversity impacts 61 5.1 Direct impacts 61 5.2 Indirect impacts 69 5.3 Summary of impacts 72 6 Biodiversity mitigation 75 6.1 Suggested management plans 75 6.2 ISCA – Ecology credits 76 7 Biodiversity residual risk 83 8 Significant impact assessment 87 8.1 Golden Sun Moth 87 8.2 Green and Golden Bell Frog 89 8.3 Murray Cod 91 Ecological_Assessment_Report | Issue | 27 August 2020 | Arup Z:\SYD\PROJECTS\267000\267007-00 QUEANBEYAN STP DETAILED\WORK\INTERNAL\BIODIVERSITY\BAR\FINAL FOR EIS SUBMISSION\ECOLOGICAL_ASSESSMENT_REPORT.DOCX Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report 9 Discussions and considerations 94 9.1 Recommendations 94 10 References 96 Tables Table 1: Conditions during Golden Sun Moth surveys Table 2: Conditions during the Pink-Tailed Worm Lizard habitat assessment Table 3: Site-based vegetation communities Table 4: Significant flora species listed in the EPBC PMST search and Significant Species Database search. Table 5: Significant fauna species listed in the EPBC PMST search and Significant Species Database search. Table 6: Native plant species observed on eastern edge of stockpile paddock. Table 7. Golden Sun Moth records at project site Table 8: Birds recorded at QSTP settling ponds. Table 9: Aquatic habitat assessment locations and summary Table 10: Impacted vegetation communities on the site. Table 11: Potential biodiversity impacts during construction and operation Table 12: Biodiversity mitigation measures Table 13: Biodiversity residual risk Table 14: Assessment against Commonwealth Significant Impact Criteria for Golden Sun Moth Table 15: Assessment against Commonwealth Significant Impact Criteria for Green and Golden Bell Frog Table 16: Assessment against Commonwealth Significant Impact Criteria for Murray Cod Figures Figure 1: QSTP location and site features Figure 2: Survey tracks, meanders and transects Figure 3: Murrumbidgee and Lake George Catchments. The red box indicates the project sites location within the catchment area (OEH, 2006) Figure 4: ACT Vegetation communities (Source: ACTmapi) Figure 5: Site-based vegetation communities Figure 6: Golden Sun Moth habitat and survey location Figure 7: Aquatic habitat assessment sites and the effluent ponds. Figure 8: Vegetation clearing impacts Figure 9: Recommended potential areas for revegetation or rehabilitation Figure 10: Trees and mixed plantings observed during field surveys Ecological_Assessment_Report | Issue | 27 August 2020 | Arup Z:\SYD\PROJECTS\267000\267007-00 QUEANBEYAN STP DETAILED\WORK\INTERNAL\BIODIVERSITY\BAR\FINAL FOR EIS SUBMISSION\ECOLOGICAL_ASSESSMENT_REPORT.DOCX Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report Appendices Appendix A ACT Search Results Appendix B Protected Matters Search Results Appendix C Golden Sun Moth Technical Report Appendix D Green and Golden Bell Frog Investigation Appendix E ACT Government Fire Maps Appendix F Flora List Ecological_Assessment_Report | Issue | 27 August 2020 | Arup Z:\SYD\PROJECTS\267000\267007-00 QUEANBEYAN STP DETAILED\WORK\INTERNAL\BIODIVERSITY\BAR\FINAL FOR EIS SUBMISSION\ECOLOGICAL_ASSESSMENT_REPORT.DOCX Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report Executive summary Queanbeyan Palerang Regional Council (QPRC) (the proponent) is seeking to upgrade and operate a sewage treatment plant (STP) at 7 Mountain Road, Jerrabomberra, ACT (the site). The site is the location of the existing Queanbeyan Sewage Treatment Plant (QSTP). The QSTP Upgrade Project (the project) will utilise a currently undeveloped portion of the site to build new infrastructure facilities that predominantly supersede the currently operational facilities. The site assessment completed by Arup in 2019/2020 determined the QSTP site is dominated by exotic flora species, with poor habitat availability for native fauna. Field assessments identified: • The presence of Golden Sun Moth Synemon plana, a critically endangered species under the Commonwealth Environment Protection and Biodiversity Conservation Act 1999 (EPBC Act) and an endangered species under the ACT Nature Conservation Act 2014 (NC Act), with limited suitable habitat present in the southern stockpile paddock; • Small patches of native grasslands in the southern stockpile paddock that do not meet the key diagnostic characteristics and condition thresholds of the Natural Temperate Grassland of the South Eastern Highlands Threatened Ecological Community (TEC), listed as critically endangered under the EPBC Act; • No suitable habitat for Pink-tailed Worm-Lizard Aprasia parapulchella due to modification of the site; • The Molonglo River is in low to moderate condition in along the project site given the extent of modification of the exotic dominate riparian vegetation of crack willow; • Likely presence of Murray Cod Maccullochella peelii within this reach of the Molonglo River; • The existing effluent ponds are of low to poor habitat quality; however, they provide a source of refugia for fauna species in the wider region; and • Green and Golden Bell Frog Litoria aurea are unlikely to occur due to the presence of the exotic Mosquitofish Gambusia holbrooki. In summary, the following are the key points for biodiversity impacts from the project: • Direct impact to the identified Golden Sun Moth has been mitigated through design of the project, and additional mitigation measures will be implemented to avoid potential indirect impacts; • The project is unlikely to result in an adverse impact on terrestrial biodiversity, and project elements such as weed removal at the Molonglo River and the proposed revegetation works at the current effluent pond sites will result in creation of higher quality habitat on site; Ecological_Assessment_Report | Issue | 27 August 2020 | Arup Page 1 Z:\SYD\PROJECTS\267000\267007-00 QUEANBEYAN STP DETAILED\WORK\INTERNAL\BIODIVERSITY\BAR\FINAL FOR EIS SUBMISSION\ECOLOGICAL_ASSESSMENT_REPORT.DOCX Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report • Notwithstanding the above, some of the trees located within the finalised clearing footprint may meet the criteria for a regulated tree under the Tree Protection Act 2005 and removal of some of the larger mature trees on site may be considered a Key Threatening Processes under the NC Act. Approval will be required to remove regulated trees. This will require tree survey to confirm and a Tree Protection Plan would be recommended to minimise impacts; and • Aquatic biodiversity is not anticipated to be adversely impacted by the project. Discharge from the QSTP will contribute environmental flows to the Molonglo River, providing water for fish even during drought conditions. The key recommended mitigation measures to avoid and/or mitigate impacts to aquatic and terrestrial biodiversity include: • Revegetation works to reinstate native vegetation on site; • Rehabilitation works at the adjacent Molonglo River; • Tree survey for large mature trees on site and preparation of a Tree Protection Plan for the project; • Clearly visible delineation of vegetation clearing boundaries during the works; • Erosion and Sediment Control Plan to be prepared and approved by the Environmental Protection Authority (EPA); • Monitoring of discharge to the Molonglo River; • Dust suppression and noise/vibration measures to minimise disturbance to wildlife; • Supervision by a fauna spotter during vegetation clearing; • Implementation of a pest and weed management plan; and • An exclusion zone around identified suitable habitat for Golden Sun Moth and diversion of stormwater from the exclusion zone. Ecological_Assessment_Report | Issue | 27 August 2020 | Arup Page 2 Z:\SYD\PROJECTS\267000\267007-00 QUEANBEYAN STP DETAILED\WORK\INTERNAL\BIODIVERSITY\BAR\FINAL FOR EIS SUBMISSION\ECOLOGICAL_ASSESSMENT_REPORT.DOCX Queanbeyan-Palerang Regional Council Queanbeyan Sewage Treatment Plant Upgrade Ecological Assessment Report 1 Introduction 1.1 Project overview Queanbeyan-Palerang Regional Council (QPRC) (the Proponent) is seeking to upgrade and operate the Queanbeyan Sewage Treatment Plant (QSTP) at 7 Mountain Road, Jerrabomberra, ACT (the Site). The Project will utilise a currently undeveloped portion of the site to build new infrastructure facilities