Table 11.1 Implementation Schedule for Water Quality
Control
EIA Ref # |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
|||
Des |
C |
O |
Dec |
|||||
S3.60 |
Measures to be implemented during dredging: · Use of a closed grab
dredger with a maximum daily production rate of 500 m3/day; · Deployment of silt
curtain to enclose the grab while dredging works are in progress. This layer of silt curtain shall be a
frame type silt curtain and designed to enclose local pollution caused by the
grab dredging. It shall consist of
floats, curtain and ballast at the bottom.
Mid-ballast may be added as necessary. The Contractor shall install the silt curtain prior to dredging
and shall remove it upon completion of dredging. In case the baseline water
quality monitoring data indicates low ambient suspended solids concentrations
of less than 12.5mg/l, a second silt curtain shall be deployed around the
project site (i.e. hanging type silt curtain) and the dredging rate lowered
to 250 m3/day. The second
layer of silt curtain shall be formed from tough, abrasion-resistant
permeable membranes, supported on floated booms in such a way as to ensure
that egress of turbid waters from the enclosed dredging area shall be
restricted; and · Use of small sized
barge and dredger for dredging works.
The maximum draft of the dredger and barge, when fully loaded, shall
not exceed 2m. The barge shall make
more frequent trips to transport the dredged material to the allocated marine
disposal ground, instead of remaining at Lung Kwu Chau until it is fully
loaded, in order to avoid grounding of the barge during low tide. |
Work site
/ During the construction period & maintenance dredging |
Contractor |
|
Ö |
Ö |
|
EIAO-TM, WPCO |
S3.61 |
Good site practices to be undertaken
during marine works: · Mechanical grabs shall
be designed and maintained to avoid spillage and sealed tightly while being
lifted; · All vessels shall be
sized such that adequate clearance (i.e. minimum clearance of 0.6m) is
maintained between vessels and the seabed in all tide conditions, to ensure
that undue turbidity is not generated by turbulence from vessel movement or
propeller wash; · All pipe leakages
shall be repaired promptly and plant shall not be operated with leaking
pipes; · The decks of all
vessels shall be kept tidy and free of oil or other substances that might be
accidentally or otherwise washed overboard. Litter
and loose objects, e.g. tools, shall not be left lying around. Wires and ropes shall be coiled and
secured, so as to cause least obstruction. Cylindrical shape items (such as
pipes), heavy objects/equipment and stagings/scaffoldings on deck shall be
lashed securely against the rolling movement of vessels. Doors shall be properly secured to open or
closed position to prevent swinging as the vessel rolls; · Adequate freeboard
(i.e. minimum of 200mm) shall be maintained on barges to ensure that decks
are not washed by wave action; · All hopper barges and
dredgers shall be fitted with tight fitting seals to their bottom openings to
prevent leakage of material; · Construction
activities shall not cause foam, oil, grease, scum, litter or other
objectionable matter to be present on the water within the site or dumping
grounds; and · Loading of barges and
hoppers shall be controlled to prevent splashing of dredged material into the
surrounding water. Barges or hoppers
shall not be filled to a level that will cause the overflow of materials or
sediment laden water during loading or transportation. |
Work site
/ During the construction period & maintenance dredging |
Contractor |
|
Ö |
Ö |
|
|
S3.62 |
Demolition
and removal works of the submerged portion of the existing jetty shall be
carried out around low tide to minimize the duration of works taking place
within the marine waters. |
Work site
/ During the construction period |
Contractor |
|
Ö |
|
|
|
# All recommendations and requirements resulted during the course of
EIA/EA Process, including ACE and/or accepted public comment to the proposed
project.
* Des - Design, C - Construction, O – Operation, and Dec -
Decommissioning
Table 11.2 Implementation Schedule for Ecological
Requirements
EIA Ref # |
Environmental Protection
Measures/Mitigation Measures |
Location/ Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
|||
Des |
C |
O |
Dec |
|||||
S4.31 |
Mitigation for terrestrial ecology · Reinstate temporary work sites/disturbed areas immediately after completion of the construction. · Check
the work site boundaries regularly to ensure they are not exceeded and that
no damage occurs to surrounding natural habitats. · Prohibit
and prevent open fires within the work site boundary during construction and
provide temporary fire fighting equipment in the work areas. |
Work site / During the construction period |
Contractor |
|
Ö |
|
|
EIAO-TM |
S4.88 |
General mitigation for Chinese White Dolphin ·
The use
of high-speed vessels in the construction or operation of the jetty shall be
avoided where possible. If high-speed
vessels must be used, they shall be required to slow to under 10 knots which
is the speed restriction for all marine traffic inside the Marine Park
Boundary. Furthermore, marine traffic entering the Marine Park to the
proposed jetty area shall follow a regular and predictable route. ·
All
vessel operators working on the project shall be given a briefing, alerting
them to the conservation significance of the Marine Park and the presence of
dolphins in the area, and setting out guidelines for safe vessel operations
around cetaceans. ·
A policy
of no dumping of rubbish, food, oil, or chemicals shall be strictly
enforced. This shall also be covered
in the contractor briefing. ·
Every
attempt shall be made to minimize the effects of construction and operation
of the jetty on the water quality of the area. Dredging works for the
approach channel shall be scheduled outside the period of late spring to
summer (i.e. May-August), when dolphins are at their peak abundance in North
Lantau waters. ·
Before
dredging, an exclusion zone of 500m radius shall be scanned around the work
area for at least 30 minutes prior to the start of dredging. If dolphins are observed in the exclusion
zone, marine works shall be delayed until they have left the area.
Furthermore, if dolphins enter the exclusion zone after dredging has
commenced, marine works shall cease until they have left the area. ·
Staff
shall monitor for the presence of dolphins within the exclusion zone by
scanning the sea both with and without binoculars whilst positioned at
vantage point near the summit of the hill behind the jetty location. The
vantage point shall enable an extensive view of the 500m exclusion zone in
all directions around the jetty. Staff shall communicate with the Engineer
via a dedicated telecommunications device (e.g. mobile phone or
‘walkie-talkie’). |
Work site / During the construction and
operation periods |
Contractor |
|
Ö |
Ö |
|
|
S4.88 |
Mitigation for minimising possible noise impacts on
dolphins ·
Other
measures recommended to mitigate noise impact on dolphins by allowing their
acclimatization to noise disturbance are to, as far as practicable: -
The
dredging works for the approach channel shall avoid the period of late spring
to summer (i.e. May-August). -
The
number of work vessels and small craft shall be minimised during the
construction phase. -
Dredging
and jetty construction activities shall be continuous without short breaks or
unpredictable noise outbursts at random intervals. -
Events
shall be scheduled on a regular basis with similar activities planned for
similar time period each day. -
Furthermore,
the Contractor shall use quiet or ‘silenced’ plant equipment. All site plant equipment shall be well
maintained. ·
Removal
of the existing jetty structure shall be done in a way that minimise noise
impact on dolphins by following the above recommended measures. Blasting
shall not be permitted. Silenced breakers shall be used and demolition and
removal works of the submerged portion of the jetty shall be carried out
around low tide to minimise transmittance of noise into the water. In addition, demolition of the jetty
structure shall be planned so that, as far as practicable, the structure is
‘cut’ into large manageable sections to minimise the amount of time breakers
are used. ·
During
the operational phase, vessels moored at the jetty for extended periods
shall, as far as practicable, turn off their engines to minimise unnecessary
underwater noise. |
Work site / During the construction and
operation periods |
Contractor |
|
Ö |
Ö |
|
|
# All recommendations and requirements
resulted during the course of EIA Process, including ACE and / or accepted
public comment to the proposed project.
* Des - Design, C - Construction, O - Operation and Dec - Decommissioning
Table 11.3 Implementation
Schedule for Waste Management
EIA Ref # |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
|||
Des |
C |
O |
Dec |
|||||
S7.26 –
S7.27 |
Marine Sediment In accordance with the WBTC No.
3/2000, the material must be dredged, transported and disposed of in a manner
which minimizes the loss of
contaminants either into solution or by resuspension. During transportation and disposal
of the dredged marine sediments, the following measures shall be taken to
minimise potential impacts on water quality. ·
Bottom
opening of barges shall be fitted with tight fitting seals to prevent leakage
of material. Excess material shall be
cleaned from the decks and exposed fittings of barges and hopper dredgers
before the vessel is moved. ·
Monitoring
of the barge loading shall be conducted to ensure that loss of material does
not take place during transportation.
Transport barges or vessels shall be equipped with automatic
self-monitoring devices as specified by the Director of Environmental
Protection. |
Work site
/ During the construction period & maintenance dredging |
Contractor |
|
Ö |
Ö |
|
WBTC
No.3/2000 |
S7.29 |
Good Site Practices and Waste Reduction
Measures Good site
practices during the construction activities include: ·
Nomination
of an approved personnel, such as a site manager, to be responsible for good
site practices, arrangements for collection and effective disposal to an
appropriate facility, of all wastes generated at the site; ·
Training
of site personnel in proper waste management procedures; ·
High
standards of waste management shall be observed on the works vessels and
barges to ensure that no waste arisings or fuel/diesel oils are disposed to
the surrounding marine waters; ·
Careful
control shall be exercised during the demolition works and strict waste
management procedures will be required to ensure that no C&D materials
and machinery fuels enter the marine waters at the site; ·
No
stockpiles of construction material shall be permitted on Lung Kwu Chau
Island; ·
All
wastes, unused construction materials and construction equipment shall be
removed from Lung Kwu Chau Island after the works are completed; ·
A
recording system for the amount of wastes generated, recycled and disposed of
(including the disposal sites); ·
In
order to monitor the disposal of C&D materials at public filling areas,
and to control fly-tipping, a trip-ticket system shall be included as one of
the contractual requirements. One may make reference to WBTC No. 5/99 for
details; and ·
A
Waste Management Plan shall be prepared and this WMP shall be submitted to
the Engineer for approval. One may make reference to WBTC No. 29/2000 for
details. |
Work site
/ During the construction period |
Contractor |
|
Ö |
|
|
Waste Disposal Ordinance (Cap.54) WBTC No.5/99, 29/2000 |
S7.30 |
Waste reduction is best achieved at the planning and
design stage, as well as by ensuring the implementation of good site
practices. Recommendations to achieve waste reduction include: ·
Prior
to disposal of C&D waste, it is recommended that wood, steel and other
metals shall be separated for re-use and / or recycling to minimise the
quantity of waste to be disposed of to landfill; ·
Proper
storage and site practices to minimise the potential for damage or
contamination of construction materials; and ·
Plan
use of construction materials carefully to minimise amount of waste generated
and avoid unnecessary generation of waste. |
Work site
/ During planning & design stage, and construction stage |
Contractor |
Ö |
Ö |
|
|
WBTC
No.4/98, 5/98 |
# All recommendations and requirements resulted during the course of
EIA/EA Process, including ACE and / or accepted public comment to the proposed
project.
* Des - Design, C - Construction, O – Operation, and Dec -
Decommissioning
Table 11.4 Implementation Schedule for Landscape and Visual
EIA Ref # |
Environmental Protection Measures / Mitigation
Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
|||
Des |
C |
O |
Dec |
|||||
S8.70 |
·
Sympathetic design to
minimise visual impact including rounded jetty cope line and irregular armour
rocks on catwalk. ·
Compatible design and
construction materials and finishes e.g. granite stone facing, visually
recessive colours or finishes of “jetty furniture”. ·
Avoidance of light
glare impact to Lung Kwu Tan villagers to be taken into account during design
of lighting system for jetty and catwalk by EMSD. |
Work site / During planning &
design stage |
CED/EMSD |
Ö |
|
|
|
|
S8.70 |
·
Reinstatement of
disturbed land. |
Work site / During construction
stage |
Contractor |
|
Ö |
|
|
|
# All recommendations and requirements resulted during
the course of EIA/EA Process, including ACE and / or accepted public comment to
the proposed project.
*
Des - Design, C - Construction, O – Operation, and Dec - Decommissioning