This Annex provides a consolidation of the mitigation measures
recommended for the Project. The
Implementation Schedule has the following column headings:
EIA Ref
This denotes the section number or
reference from the EIA Report Main text.
EM&A
Log Ref
This denotes the sequential number
of each of the recommended mitigation measures specified in the Implementation
Schedule.
Environmental Protection
Measures
This denotes the recommended
mitigation measures, courses of action or subsequent deliverables that are to
be adopted, undertaken or delivered to avoid, minimise or ameliorate predicted
environmental impacts.
Objectives
This denotes the objectives of the
recommended mitigation measures and main concerns to address.
Location/Duration of
Measures/Timing of Completion of
Measures
This indicates the spatial area in
which the recommended mitigation measures are to be implemented together with
details of the programming or timing of their implementation.
This denotes where the
responsibility lies for the implementation of the recommended mitigation
measures.
This denotes the stage at which the
recommended mitigation measures are to be implemented either during the Design,
Construction, Operation or Decommissioning.
Relevant Legislation
This section defines the controlling
legislation that is required to be compiled with.
Implementation Schedule
EIA* Ref. |
EM&A Log Ref |
Environmental Protection Measures |
Objectives |
Location/Duration of Measures/Timing of
Completion of Measures |
Implementation Agent |
Implementation Stage** |
Relevant
Legislation & Guidelines |
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WATER QUALITY |
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Section
2.4 of Part 3 |
1 |
Although
there is no requirement for constraints on timing or sequencing apparent from
the assessment, as all scenarios have been demonstrated to be acceptable with
the required mitigation measures in place. The following operational constraints shall be implemented
to ensure no unacceptable water quality impacts. |
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Section 2.4 of Part
3 |
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·
Dredging
operations within the |
To
avoid unacceptable water quality impacts during dredging |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
Backfilling operations within the |
To
avoid unacceptable water quality impacts during backfilling |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
Capping operations within the |
To
avoid unacceptable water quality impacts during capping |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
No overflow is permitted from the trailer suction
hopper dredger but the Lean Mixture Overboard (LMOB) system will be in
operation at the beginning and end of the dredging cycle when the drag head
is being lowered and raised. |
To
avoid unacceptable water quality impacts during dredging |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
Dredged marine mud shall be disposed of in a
gazetted marine disposal area in accordance with the Dumping at Sea Ordinance (DASO)
permit conditions. |
To
avoid unacceptable water quality impacts during dredging |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
2 |
The following good practice
measures shall apply at all times: ·
All disposal vessels should be fitted with
tight bottom seals in order to prevent leakage of material during transport. |
To
prevent leakage of material during transport |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
All barges should be filled to a level, which ensures
that material does not spill over during transport to the disposal site and
that adequate freeboard is maintained to ensure that the decks are not washed
by wave action. |
To
ensure that material does not spill over during transport and the decks are
not washed by wave action |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
After dredging, any excess materials should be
cleaned from decks and exposed fittings before the vessel is moved from the
dredging area. |
To
avoid potential adverse water quality impacts associated with dredging |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
The contractor(s) should ensure that the works
cause no visible foam, oil, grease, litter or other objectionable matter to
be present in the water within and adjacent to the dredging site. |
To
avoid potential adverse water quality impacts associated with dredging |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
If installed, degassing systems should be used
to avoid irregular cavitation within the pump. |
To
avoid adverse water quality impacts due to irregular cavitation within the
pump |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
Monitoring and automation systems should be used
to improve the crew’s information regarding the various dredging parameters
to improve dredging accuracy and efficiency. |
To improve
dredging accuracy and efficiency |
At the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
Control and monitoring systems should be used
to alert the crew to leaks or any other potential risks. |
To
alert the crew to leaks or any other potential risks |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
When the dredged material has been unloaded at
the disposal areas, any material that has accumulated on the deck or other
exposed parts of the vessel should be removed and placed in the hold or a
hopper. Under no circumstances
should decks be washed clean in a way that permits material to be released
overboard. |
To prevent
release of dredged materials overboard |
At the |
Contractor |
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Water Pollution Control Ordinance |
Section 2.4 of Part
3 |
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·
All dredgers should maintain adequate clearance
between vessels and the seabed at all states of the tide and reduce
operations speed to ensure that excessive turbidity is not generated by
turbulence from vessel movement or propeller wash. |
To
ensure that under-vessel turbidity is not generated by turbulence from vessel
movement or propeller wash |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 3 of |
3 |
Water quality
monitoring will be required for the following activities at the ·
Dredging of each pit; ·
Backfilling of each pit with contaminated mud;
and ·
Capping of each pit with uncontaminated Mud. |
To
avoid impacts to water quality during dredging, backfilling and capping |
At
the |
Contractor |
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Water Pollution Control Ordinance |
Section 3 of |
4 |
Sediment quality
monitoring will be required for the backfilling activities at the |
To
avoid impacts to water quality during backfilling |
At
the |
Contractor |
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Water Pollution Control Ordinance |
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MARINE ECOLOGY |
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Section 3 of |
5 |
In accordance with
the guidelines in the EIAO-TM, the
general policy for mitigating impacts to marine ecological resources shall be
applied in order of the following priority:
·
Avoidance: Potential impacts should be avoided
to the maximum extent practicable by adopting suitable alternatives; ·
Minimisation: Unavoidable impacts should be
minimised by taking appropriate and practicable measures such as constraints
on the intensity of works operations (eg dredging rates) or timing of works
operations; and ·
Compensation: The loss of important species and
habitats may be provided for elsewhere as compensation. Enhancement and other conservation measures
should always be considered whenever possible. |
To
avoid potential impacts to marine ecology |
During
project planning and design |
Design Team |
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EIAO-TM |
Section 3 of |
6 |
Sediment toxicity
monitoring will be conducted to assess the potential toxicity impacts to
marine life due to disposal activities. |
To
avoid impacts to marine life due to disposal activities |
At
the |
Contractor |
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7 |
Benthic
recolonisation monitoring will be required to assess the recolonisation
status of benthic fauna on capped pits. |
To
assess the recolonisation status of benthic fauna on capped pits |
At
the |
Contractor |
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Hazard
to Health |
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Section 3 of |
8 |
A
risk assessment to verify that no unacceptable risk are occurring to either
human health or marine mammals as a result of consuming prey species from the
waters in the vicinity of the pits will be required. |
To
assess hazard to health of humans and marine mammals |
In
the vicinity of the |
Contractor |
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CULTURAL HERITAGE |
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Section
7 of Part 2 |
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To
establish the archaeological
potential of the |
At
the South Brothers Facility if it is to be used, |
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ü |
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AMO Marine Archaeological Investigation Guidelines |