Transport for NSW Beaches Link and Gore Hill Freeway Connection Appendix M Contamination transport.nsw.gov.au DECEMBER 2020 e Transport for NSW Beaches Link and Gore Hill Freeway Connection Technical working paper: Contamination December 2020 Prepared for Transport for NSW Prepared by Jacobs Group (Australia) Pty Ltd © Transport for NSW The concepts and information contained in this document are the property of Transport for NSW. You must not reproduce any part of this document without the prior written approval of Transport for NSW. Technical working paper: Contamination Contents Executive Summary ............................................................................................................................................................ iv Glossary and abbreviations ............................................................................................................................................ viii 1. Introduction ............................................................................................................................................................ 1 1.1 Overview ..................................................................................................................................................................................... 1 1.2 The project................................................................................................................................................................................. 1 1.3 Project location ........................................................................................................................................................................ 1 1.4 Key features of the project .................................................................................................................................................. 2 1.5 Key construction activities ................................................................................................................................................... 6 1.6 Purpose of this report ........................................................................................................................................................... 9 1.7 Secretary’s environmental assessment requirements.............................................................................................. 9 1.8 Relevant contamination guidelines .............................................................................................................................. 10 2. Assessment methodology ................................................................................................................................ 12 3. Existing environment ......................................................................................................................................... 13 3.1 Location and land use zones ........................................................................................................................................... 13 3.2 Topography and drainage ................................................................................................................................................ 19 3.3 Geology .................................................................................................................................................................................... 21 3.4 Soils ........................................................................................................................................................................................... 26 3.5 Soil erosion hazard .............................................................................................................................................................. 29 3.6 Acid sulfate soils risk .......................................................................................................................................................... 29 3.7 Soil salinity ............................................................................................................................................................................. 31 3.8 Hydrogeology ........................................................................................................................................................................ 31 3.9 Receiving environments .................................................................................................................................................... 32 3.10 Site inspection ....................................................................................................................................................................... 32 4. Information review ............................................................................................................................................. 34 4.1 Historical aerial photography ......................................................................................................................................... 34 4.2 Other information sources ............................................................................................................................................... 36 4.3 NSW contaminated sites register................................................................................................................................... 60 4.4 Previous contamination site investigations ............................................................................................................... 63 4.5 Local knowledge .................................................................................................................................................................. 73 5. Contamination investigation findings ........................................................................................................... 74 5.1 Potential areas of environmental interest ................................................................................................................. 74 5.2 Summary of areas of environmental interest exposure risk ............................................................................... 93 6. Assessment of construction impacts ............................................................................................................. 96 6.1 Soil erosion hazard .............................................................................................................................................................. 96 6.2 Acid sulfate soils................................................................................................................................................................... 96 6.3 Salinity...................................................................................................................................................................................... 96 6.4 Contamination – soil ........................................................................................................................................................... 97 6.5 Contamination – sediments ............................................................................................................................................. 97 Beaches Link and Gore Hill Freeway Connection Technical working paper: Contamination i Technical working paper: Contamination 6.6 Contamination – groundwater ........................................................................................................................................ 98 6.7 Contamination – landfill gas ........................................................................................................................................... 98 7. Assessment of operational impacts ............................................................................................................... 99 7.1 Soil erosion hazard .............................................................................................................................................................. 99 7.2 Acid sulfate soils................................................................................................................................................................... 99 7.3 Salinity...................................................................................................................................................................................... 99 7.4 Contamination – soil ........................................................................................................................................................... 99 7.5 Contamination – sediments ............................................................................................................................................. 99 7.6 Contamination – groundwater ..................................................................................................................................... 100 7.7 Contamination – ground gas ........................................................................................................................................ 100 8. Cumulative impacts .......................................................................................................................................... 101 9. Environmental management measures ...................................................................................................... 102 10. References .........................................................................................................................................................