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1 Dredging and Disposal Summary of Proposed Activities and - PowerPoint PPT Presentation

Oct 16, 2022 •193 likes •598 views

1 Dredging and Disposal Summary of Proposed Activities and Discussion on Submissions and Impacts 20 March 2020 2 Our Presentation Today POALs 30 POALs POALs Concerns Some Year Plan Capital Disposal Raised in comments on

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  2. Dredging and Disposal Summary of Proposed Activities and Discussion on Submissions and Impacts 20 March 2020 2

  3. Our Presentation Today POAL’s 30 POAL’s POAL’s Concerns Some Year Plan Capital Disposal Raised in comments on Dredging Consent Consent Northport Consent Submissions Application 3

  4. The Port may move… We figure this will be at least 30 years. This is the horizon used for our 30 Year Masterplan. Port Future Study “Short -term pathways need to be created to enable the Port to continue to operate efficiently prior to a planned new Port being established due to the substantial lead times involved. In this regard, the CWG identifies that additional berth length needs to be provided to fulfil the short and medium term capacity requirements of the Port in response to cruise and multi- cargo requirements.” 4

  5. Infrastructure Update – Complete/Underway Fergusson Container Automation Multi-Cargo Infrastructure Terminal • 3rd berth FN completed • All 27 A-Strads under LET • Building of 5 storey car handling • Demolishing of 3 cranes on • 3 new cranes tested • Over 13,000 hours of testing facility Bledisloe • Road grids remodeled • New tug berth completed approx. 500 hours per A-strad • Consent obtained for disposal of • Hatch Lid Platforms on all 8 • 30 odd Locata poles raised dredgings at sea • 22km of trenching for fibre optic cranes • Consenting for channel deepening • Lash Platforms on all 8 cranes cabling • Development of Freight Hub • New layout, 10 hectares of • Project on planned time line for infrastructure for Supply Chain repaving Phase 1 end March 2020 strategy • Southern Reefer (900 plugs) • Automation from truck grid to Terminal stack – manual from complete • Reclamation ongoing terminal stack to/from crane 5

  6. Project Timeline The remaining Masterplan projects: Demolish Shed 51 and part of Bledisloe B1 Wharf – 2021 1. Construct North Berth at Bledisloe – 2021/2023 2. Construct roof top park on car handling building – 2022 3. Relocate ships from Captain Cook to Bledisloe north – 2023 4. Replace wharf structure at south end of Bledisloe west – 2023/2024 5. Construct new sea wall south of Marsden Wharf – 2023/2024 6. Remove Marsden Wharf and deepen Captain Cook/Bledisloe basin – 2024/2025 7. Deepen channel – within 3 years 8. Engineering Workshop – design underway 9. 10. Rail Grid Automation 11. Extend FN Wharf 6

  7. Proposed Capital Dredging 7

  8. Current Capital Dredging Consent Application 15 year consent sought for 2.5m m 3 • capital dredging • Staged - dredging only when required • Stage 1: for 6-7,000 TEU vessels already calling in NZ – starting in 2021 • Stage 2: for new 13,000 TEU Panamax class vessels – expected to start in 2025 – 2027 • Application includes maintenance dredging within the channel • All main Australia / NZ ports preparing for Panamax class ships 8

  9. Capital Dredging Consent – Regulatory Framework Consenting framework in the Unitary Plan: Capital dredging is a restricted discretionary activity 1. Restricted matters of discretion include: 2. the effects of construction works methods, and the timing and hours of operation; ― the effects of the location, extent, design and materials; ― effects on coastal processes, ecological values, water quality including the release of ― any contaminated sediment, and natural character and landscape values; effects on public access, other users of the coastal marine area, harbour traffic, and ― navigation and safety; effects on existing uses and activities (including significant infrastructure); ― effects on Mana Whenua values; ― effects on historic heritage; and ― consent duration and monitoring. ― Maintenance dredging activities are a controlled activity 3. 9

  10. Recap of Previous Dredging Activities in the Channel Ports need to dredge to maintain • safe navigation • Channel dredged number of times since the 50’s Previous capital dredging • consented to 13.0m in 2001 • Only undertaken to 12.5m 2004- 2007 • Material used to reclaim Fergusson Terminal Historic Channel Dredging Fergusson Terminal complete by • 2021 10

  11. FN Berth and Approaches Stage 1: Dredging • Channel design maximises use of tidal windows to minimise dredge volumes All dredging within existing precincts • Depth of material to be removed varies • Stage 1 Stage 2 Dredged Location Volume Dredged Depth Dredged Depth (m 3 ) (CD) (CD) Shipping lane – bends -13.5m -14.2m 1,105,100 Shipping lane – -13.5m -14m 1,149,300 straights Fergusson -13m -13.5m 184,100 approaches Fergusson North Berth -15.2m -15.2m 61,100 Total 2,409,600 Navigation Channel 11

  12. How do we dredge? • We use a barge mounted excavator • Bottom opening hopper barge loaded directly by excavator Methodology used for many years • around Auckland • Low impact - minimises sediment release and disturbance to other users Duration of works: • ― Stage 1 approximately 2 years ― Stage 2 approximately 3-4 years 12

  13. Dredged Material Disposal 13

  14. Disposal Permit POAL granted (by EPA) a 35 year • disposal consent at Cuvier Disposal Site (CDS) in June 2019 • One of five designated disposal sites in NZ, in use since the end of WWII POAL (and others) have used site • previously • POAL needs at least 1 disposal option when Fergusson Terminal is completed next year Consent authorises disposal of capital • and maintenance dredged material 14

  15. CDS Disposal Site Location 15

  16. Characteristics of Disposal Site Application found disposal will not adversely affect local environment outside designated area (or Great Barrier) Disposal site – 700m deep on side of • continental shelf - currents low and dominated by north-south flow CDS is 4 nautical miles diameter – • disposal to occur within 250m of one location in CDS Water currents Over 90% reaches seabed directly as a • Seabed characteristics plume Behaviour of dumped material 16

  17. Characteristics of Disposal Site Note that the colour bar scale is a logarithm scale −1 and −2 equate to thicknesses of 0.1 and 0.01 mm, respectively. • 10% of fines stripped on way down and deposited in CDS or close to CDS boundary • Contamination and toxicity levels assessed / approved before disposal • Assessments involves contaminant levels - bioavailability (elutriate testing) - species toxicity - • Assessment compared against Near Field Modelling - Depth of published ANZEEC guideline values deposition (microns) • Sediments concentrations that do not Far field modelling output pass assessment(s) not permitted to be disposed off at site 17

  18. Capital Dredging Summary of Submissions 18

  19. Main Points Raised in Submissions • Lack of Consultation • Impacts on the Environment • Impacts on our Food Basket (from disposal) Duration of Consent • Alternatives to Disposal / Beneficial Reuse • • Transit of material through Hauraki Gulf / Emergencies 19

  20. Consultation • POAL has engaged with wide cross section of mana whenua and stakeholders to date POAL requested notification of • dredging consent • POAL is keen to listen to stakeholders and address concerns where we can Unitary Plan Port and Navigation Precincts 20

  21. Environmental Concerns Key topics raised: Nature of material and levels of contamination • Increased sedimentation and effects on marine environment • • Effects of sediment on water clarity and on marine life (e.g. on snapper) • Effects on coastal birds • Effects on marine mammals Biosecurity • 21

  22. Capital Dredged Material Characteristics Material is sediment that filled the historic river • valley when sea level rose after the last ice age. All but surface sediments pre-human. • Surface material ranges from very shelly to muddy sand and sandy mud • Below surface - material consolidated less water content Some subsurface siltstone and Parnell grit at south • bend of channel RC-E-236B RC-B-108B Subsurface sediments in the Rangitoto Channel 22

  23. Sediment Contamination • POAL has examined sediment quality in channel in 2001 and 2019. • Channel remote from any direct sources of contamination. Most of the sediment is subsurface and • expected to be uncontaminated. Some common urban contaminants can be • identified (lead, PAHs etc.) in the surface sediment. • Concentrations are all lower than ANZECC (2018) guidance values with exception two subsamples in FN berth approaches that contained TBT. Consistent levels of contamination over • time - Lead levels decreasing. 23

  24. Sediment Contamination • No waterborne toxicity expected based on 2019 tests and previous waterfront elutriate testing • EPA still requires further testing for any disposal at CDS and must approve sampling plan before sampling and testing Additional sampling for EPA will involve: • ― Coring / samples collected randomly across full depth of dredging ― More analysis for trace elements ― Analysis for persistent organics ― Analysis for TBT particularly focused at FN berth due to results to-date ― Additional elutriate testing if required ― Toxicity testing if required Results reviewed by EPA prior to approving material suitable for disposal at sea • 24

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