LONG-TERM MAINTENANCE DREDGING MANAGEMENT PLAN PORT OF CAIRNS JUNE 2019 PORT OF CAIRNS LTMDMP-01 LONG-TERM MAINTENANCE DREDGING MANAGEMENT PLAN Table of Contents 1. Introduction.................................................................................................................................. 7 1.1. Purpose, Objectives and Scope ............................................................................................. 8 1.2. Transitional Arrangements .................................................................................................... 9 1.3. Policy Context ...................................................................................................................... 10 1.4. Legislation Pertaining to Maintenance Dredging ................................................................ 12 1.5. Existing Maintenance Dredging Approvals ......................................................................... 12 1.6. General Approvals Requirements ....................................................................................... 13 1.7. Publication and Accessibility ............................................................................................... 14 1.8. Roles and Responsibilities of Port Authority and Port Users .............................................. 14 1.8.1. Port Authority .................................................................................................................. 14 1.8.2. Port Users ........................................................................................................................ 15 1.8.3. Responsibilities for Maintenance Dredging .................................................................... 15 1.8.4. Queensland Maintenance Dredging Schedule ................................................................ 17 2. Port Locality, Setting, and Shipping ............................................................................................ 18 2.1. Existing Port Navigational Infrastructure ............................................................................ 19 2.2. Channel and Swing Basins ................................................................................................... 19 2.3. Berth Layout ........................................................................................................................ 21 2.4. Aids to Navigation ............................................................................................................... 24 2.5. Anchorage Areas and Conditions ........................................................................................ 24 2.6. Tidal Restrictions ................................................................................................................. 24 2.7. Under Keel Clearance .......................................................................................................... 24 2.8. Extreme Weather Condition ............................................................................................... 24 2.9. Tidal Information ................................................................................................................. 25 2.10. Maximum Vessel Size ...................................................................................................... 25 3. Port Environmental Values ......................................................................................................... 26 3.1. World Heritage Area and Marine Park ................................................................................ 26 3.2. Matters of National Environmental Significance ................................................................ 28 3.3. Matters of State Environmental Significance ...................................................................... 29 3.4. Coastal Processes ................................................................................................................ 30 3.5. Mangroves ........................................................................................................................... 31 3.6. Intertidal and Sub tidal Sediments, Sand and Mud Flat ...................................................... 32 Doc. Location: http://seaport/sites/environment/For Upload to Environment Page/LMDMPs/Cairns LMDMP_V2.docx Version No.: 2 Printed document is uncontrolled. Electronic document is controlled Page 2 PORT OF CAIRNS LTMDMP-01 LONG-TERM MAINTENANCE DREDGING MANAGEMENT PLAN 3.7. Seagrass ............................................................................................................................... 32 3.8. Terrestrial Fauna and Birdlife of Conservation Significance ............................................... 35 3.9. Marine Turtles ..................................................................................................................... 36 3.10. Climate ............................................................................................................................. 37 3.11. Fisheries and Aquaculture ............................................................................................... 37 3.12. Cultural Heritage Places and Value ................................................................................. 38 3.13. Locations of Values .......................................................................................................... 38 3.14. Social Values .................................................................................................................... 39 2. Community needs. .................................................................................................................. 39 3.15. Economic Values .............................................................................................................. 39 3.16. Historical Significance ...................................................................................................... 40 3.17. Potential Impacts to Sensitive Areas or Values ............................................................... 41 4. Consultation and Key Issues ....................................................................................................... 41 4.1. Identification of Interested and Affected Parties ............................................................... 41 4.2. Port Advisory Group (PAG) .................................................................................................. 42 4.3. Local Marine Advisory Committee (LMAC) ......................................................................... 43 4.4. Technical Advisory Consultative Committee (TACC) ........................................................... 43 4.5. Future Consultation ............................................................................................................. 46 5. Sediment Assessment ................................................................................................................ 47 5.1. Port Sediment ...................................................................................................................... 47 5.1.1. Physical Properties ........................................................................................................... 47 5.1.2. Chemical Properties ......................................................................................................... 47 5.1.3. Introduced Marine Pests ................................................................................................. 47 5.1.4. Potential Contamination Sources .................................................................................... 48 5.1.5. Sediment Movement and Coastal Process within Trinity Bay ......................................... 49 5.2. Minimisation of Sediment Accumulation and Dredging Need ........................................... 52 5.3. Maintenance Dredging and Disposal Requirement ............................................................ 53 5.3.1. Past Maintenance Dredging ........................................................................................... 53 5.3.2. Present Maintenance Dredging ....................................................................................... 54 5.3.2.1. Annual Siltation Trend ................................................................................................. 55 5.3.2.2. Material Placement Area – Ocean Disposal Site .......................................................... 56 5.3.2.3. TSHD Brisbane .............................................................................................................. 57 5.3.2.4. Grab Dredge - Willunga ............................................................................................... 59 5.3.2.5. Bed Levelling ................................................................................................................ 59 Doc. Location: http://seaport/sites/environment/For Upload to Environment Page/LMDMPs/Cairns LMDMP_V2.docx Version No.: 2 Printed document is uncontrolled. Electronic document is controlled Page 3 PORT OF CAIRNS LTMDMP-01 LONG-TERM MAINTENANCE DREDGING MANAGEMENT PLAN 5.3.3. Future Maintenance Dredging......................................................................................... 60 5.4. Examination of Reuse, Recycling, and Disposal Option ...................................................... 61 5.5. Selected Future Dredging and Disposal Strategy ................................................................ 70 6. Risk Assessment Framework