Sustainable Sediment Management

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1 Sustainable Sediment Management Port of Hay Point SSM assessment for navigational maintenance Kevin Kane Senior Manager Environment

2 Port of Weipa Port of Hay Point Port of Hay Point Port of Abbot Point Port of Mackay Port of Hay Point

3 Established as a coal Port in berths, up to 3.8km offshore 9 Mm 3 capital campaign in 2006 Channel approximately 9km long Apron approximately 4km long Maintenance campaigns 2008 and 2010 Tug Harbour Exported 115,768,354 tonnes in 2015/16 Over 1100 ship visits

4 The Waste Hierarchy London Convention Convention on the Prevention of Marine Pollution by Dumping of Wastes and Other Matter London Protocol 1996 modernise the convention Sea Dumping Act 1981 National Assessment Guidelines for Dredging 2009

5 N.A.G.D Waste Prevention For dredge material, this should focus on identifying and managing controllable sources of sediment contamination, such as port loading and unloading practices Evaluating Alternatives Are there opportunities to beneficially use or recycle the material? If they have no beneficial use, can they be treated to destroy, reduce or remove the hazardous constituents? If hazardous constituents are destroyed, reduced or removed, do the materials have beneficial reuse? What are the comparative risks to the environment and human health of the alternatives? What are the costs and benefits of the alternatives?

6 N.A.G.D Clearly not developed with clean dredge material in mind Waste Prevention For dredge material, this should focus on identifying and managing controllable sources of sediment contamination, such as port loading and unloading practices Evaluating Alternatives Are there opportunities to beneficially use or recycle the material? If they have no beneficial use, can they be treated to destroy, reduce or remove the hazardous constituents? If hazardous constituents are destroyed, reduced or removed, do the materials have beneficial reuse? What are the comparative risks to the environment and human health of the alternatives? What are the costs and benefits of the alternatives?

7 New Interpretation agreements under Sea Dumping Act How to avoid or reduce the need for at-sea disposal of clean dredged maintenance material. How to avoid or reduce the need for maintenance dredging at the Port. Better demonstrate why beneficial reuse is feasible or not. Undertake comparative analysis between land-based and at-sea disposal alternative Take a long term whole of port view

8 Re-stated Do we need to undertake maintenance dredging at the Port, now and in the future? What happens if we don t undertake maintenance dredging? Can sedimentation be managed? If dredging is necessary, what is the most suitable and feasible long-term means for disposal? Demonstrate how the greater port community has been considered, including aspects such as human health and safety, operational effects, economic impacts, cultural heritage, environment and social issues.

9 Sustainable Sediment Management Avoid Reduce Exclusion of Future Uses Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis Economic Feasibility Social Consideration Sustainable Sediment Management Hazards and Safety Operational Requirements Human Health and Nuisance Environmental Effects Amora facility Port of Antwerp

10 Work being undertaken Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Sediment Budget GBR scale and drilling down to regional scale 2. Bathymetric Analysis Using historic hydrographic surveys (10 years) 3. Environmental Monitoring NQBP long term ambient monitoring program 4. Bathymetric Modelling Identifying system drivers to change in bathymetry 5. Predictive Modelling Model future sediment volumes in navigational infrastructure 6. Engineered and technological solutions to dredging Non dredging solutions 7. Effects of sedimentation on Port operations Why do we need to dredge 1. Do we need to undertake maintenance dredging now and in the future? 2. Can sedimentation be managed? 3. What happens if we don t undertake maintenance dredging?

11 Avoid or reduce - findings Primary sediment driver is littoral drift travelling north. Reducing fluvial sources of sediment through incatchment sediment control measures will have result in little reduction to future maintenance dredging requirements Erosion from prop-wash, particularly in departure path and apron areas (approx. 500,000m 3 ) Unpredictable change associated with cyclones TC Ului in March 2010 ( no change) TC Dylan in January 2014 (erosion 300, ,000m 3 ) Norther Apron and Berth Pockets are high accretion zones with predictable siltation pattern 215,000m 3 to 265,000m 3 every 3 years, mainly from berth pockets Operational changes may extend frequency to approximately every 5 years.

12 Comprehensive Beneficial Reuse Assessment Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Sediment Properties 2. Material Suitability 3. Opportunity 4. Cost 5. Process 6. Duration 7. GHG emissions 8. Environmental Implications 9. Social Implications 10. Economic Implications 11. Approvals and Permits 12. Constraints 13. Knowledge Gaps 14. Future Considerations 4. If dredging is necessary, what is the most suitable and feasible longterm means for disposal?

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15 Exploring Alternatives Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Integrated Environmental Values Assessment 2. Constraints Mapping 3. Engineering Design Criteria 4. Costs 5. Dredging and Disposal Process 6. Duration 7. GHG emissions 8. Tailwater and Plume Modelling 4. If dredging is necessary, what is the most suitable and feasible longterm means for disposal?

16 Integrated Environmental Values Assessment Document Library Environmental Values GIS Easily Updated User Access Current and Historical Information Monitoring Data Environment Dashboard

17 Structured Decision Making Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Values based thinking 2. What s important 3. Strong stakeholder focus 4. Defendable, transparent decision making Founded on the idea that good decisions are based on an in-depth understanding of both values (what s important) and consequences (what s likely to happen in an alternative is implemented) 4. If dredging is necessary, what is the most suitable and feasible longterm means for disposal? 5. Demonstrate how the greater port community has been considered, including aspects such as human health and safety, operational effects, economic impacts, cultural heritage, environment and social issues.

18 Stakeholder Consultation NQBP is making decisions on how best to manage sedimentation at the Port of Hay Point, now and into the future. They will explore a range of Alternatives DEFINING OBJECTIVES DEVELOPING MEASURES In making that decision what do want NQBP to consider that is important (or of value) to you, your group or the industry you represent? How do you think this is measured?

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20 Developing Measures Example Human Health and Safety

21 Example 1 time only solution Raw Scores Normalised and Weighted Scores

22 Example 25 year solution Raw Scores Normalised and Weighted Scores

23 Conclusions Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Business Case 2. Communication tool for stakeholders 3. Transparent process for regulators 4. Defendable decision making process

24 Conclusions Avoid Reduce Reuse Recycle Treat Onshore Solution At Sea Solution Comparative Analysis 1. Business Case 2. Communication tool for stakeholders 3. Transparent process for regulators 4. Defendable decision making process Ports have been around for generations and will be around for generations to come OUR HOME IS GIRT BY SEA

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