13
IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION
MEASURES
Table 13.1 Implementation
Schedule for Air Quality Control
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EIA Ref |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
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Dec |
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Construction Phase |
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S |
No adverse air quality impacts at
the ASRs are expected during dredging.
However, the operated dredger should be regularly maintained to
minimise emissions. |
Work
site / during construction |
Contractor |
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Ö |
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EIAO-TM |
* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.2 Implementation
Schedule for Noise Control
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EIA Ref |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
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Des |
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O |
Dec |
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Construction Phase |
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Good Site
Practice: Ÿ
Only
well-maintained plant shall be operated on-site and plant shall be serviced
regularly during the construction program. Ÿ
Silencers
or mufflers on construction equipment shall be utilized and shall be properly
maintained during the construction program. Ÿ
Mobile
plant, if any, shall be sited as far away from NSRs as possible. Ÿ
Machines
and plant (such as trucks) that may be in intermittent use shall be shut down
between works periods or shall be throttled down to a minimum. Ÿ
Plant
known to emit noise strongly in one direction shall, wherever possible, be
orientated so that the noise is directed away from the nearby NSRs. Ÿ
Material
stockpiles and other structures shall be effectively utilized, wherever
practicable, in screening noise from on-site construction activities. |
Work Sites / During Construction |
Contractor |
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Ö |
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EIAO-TM, NCO |
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S |
Use of quiet powered mechanical equipment for the
following tasks: Ÿ
Submarine
pipelines (marine section) |
Work Sites / During Construction |
Contractor |
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Ö |
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EIAO-TM, NCO |
* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.3 Implementation
Schedule for Water Quality Control
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EIA Ref |
Environmental Protection Measures
/ Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
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Des |
C |
O |
Dec |
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Construction Phase |
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S5.8 |
Dredging
for
construction of the water mains shall be carried out
by closed grab dredger.
The corresponding dredging rates shall not be more than |
Work site / During the
construction period |
Contractor |
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Ö |
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EIAO-TM, WPCO |
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S5.8, Figure 5.3 |
Silt screens shall be applied to seawater intakes at interim WDII construction stages as stated below:
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Work site / During the
construction period |
Contractor |
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EIAO-TM, WPCO |
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S5.8 |
Other mitigation measures include: · mechanical grabs, if used, shall be designed and maintained to avoid spillage and sealed tightly while being lifted. For dredging of any contaminated mud, closed watertight grabs must be used; · all vessels shall be sized so that adequate clearance 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 hopper barges and
dredgers shall be fitted with tight fitting seals to their bottom openings to
prevent leakage of material; |
Work site / During the
construction period |
Contractor |
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Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
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· 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; |
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· 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 polluted water during loading or transportation; and |
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S5.8 |
Silt screens are recommended to be deployed at the seawater intakes during the marine works period. Installation of silt screens at the seawater intake points may cause a potential for accumulation and trapping of pollutants, floating debris and refuse behind the silt screens and may lead to potential water quality deterioration at the seawater intake points. Major sources of pollutants and floating refuse include the runoff and storm water discharges from the nearby coastal areas. As a mitigation measure to avoid the pollutant and refuse entrapment problems and to ensure that the impact monitoring results are representative, regular maintenance of the silt screens and refuse collection shall be performed at the monitoring stations at regular intervals on a daily basis. The Contractor shall be responsible for keeping the water behind the silt screen free from floating rubbish and debris during the impact monitoring period. |
Work site / During the construction
period |
Contractor |
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Ö |
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EIAO-TM, WPCO |
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S5.8 |
The
mitigation measures for construction runoff and drainage as listed below
should be implemented where applicable. Construction Runoff and Drainage Exposed soil areas should be minimised to reduce the potential for
increased siltation, contamination of runoff, and erosion. Construction runoff related impacts
associated with the above ground construction activities can be readily
controlled through the use of sediment traps and adequate maintenance of
drainage systems to prevent flooding and overflow. Construction site should
be provided with adequately designed perimeter channel and pre-treatment
facilities and proper maintenance.
The boundaries of critical areas of earthworks should be marked and
surrounded by dykes or embankments for flood protection. Temporary ditches should be provided
to facilitate runoff discharge into the appropriate watercourses, via a silt
retention pond. Permanent
drainage channels should incorporate sediment basins or traps and baffles to
enhance deposition rates. The
design of efficient silt removal facilities should be based on the guidelines
in Appendix A1 of ProPECC PN 1/94. |
Work site / During the
construction period |
Contractor |
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Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
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Ideally,
construction works should be programmed to minimise surface excavation works
during the rainy season (April to September). All exposed earth areas should be completed
as soon as possible after earthworks have been completed, or alternatively,
within 14 days of the cessation of earthworks where practicable. If excavation of soil cannot be
avoided during the rainy season, or at any time of year when rainstorms are
likely, exposed slope surfaces should be covered by tarpaulin or other means. |
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A
sediment tank constructed from pre-formed individual cells of approximately 6
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Open stockpiles of construction materials (for examples,
aggregates, sand and fill material) of more than |
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S5.8 |
Construction Runoff and Drainage
(continued) Manholes
(including newly constructed ones) should always be adequately covered and
temporarily sealed so as to prevent silt, construction materials or debris
being washed into the drainage system and storm runoff being directed into
foul sewers. Precautions
to be taken at any time of year when rainstorms are likely, actions to be
taken when a rainstorm is imminent or forecast, and actions to be taken
during or after rainstorms are summarised in Appendix A2 of ProPECC PN
1/94. Particular attention should
be paid to the control of silty surface runoff during storm events. Oil
interceptors should be provided in the drainage system and regularly cleaned
to prevent the release of oils and grease into the storm water drainage
system after accidental spillages.
The interceptor should have a bypass to prevent flushing during
periods of heavy rain. |
Work site / During the
construction period |
Contractor |
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Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
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All vehicles and plant should be cleaned before leaving a construction
site to ensure no earth, mud, debris and the like is deposited by them on
roads. An adequately designed and
located wheel washing bay should be provided at every site exit, and
wash-water should have sand and silt settled out and removed at least on a
weekly basis to ensure the continued efficiency of the process. The section of access road leading to,
and exiting from, the wheel-wash bay to the public road should be paved with
sufficient backfall toward the wheel-wash bay to prevent vehicle tracking of
soil and silty water to public roads and drains. |
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S5.8 |
Construction Runoff and Drainage
(Continued) It
is recommended that on-site drainage system should be installed prior to the commencement
of other construction activities.
Sediment traps should be installed in order to minimise the sediment
loading of the effluent prior to discharge into foul sewers. There shall be no direct discharge of
effluent from the site into the sea. All
temporary and permanent drainage pipes and culverts provided to facilitate
runoff discharge shall be adequately designed for the controlled release of
storm flows. All sediment control
measures shall be regularly inspected and maintained to ensure proper and
efficient operation at all times and particularly following rain storms. The temporarily diverted drainage
shall be reinstated to its original condition when the construction work is
finished or the temporary diversion is no longer required. All
fuel tanks and store areas shall be provided with locks and be sited on
sealed areas, within bunds of a capacity equal to 110% of the storage
capacity. |
Work site / During the
construction period |
Contractor |
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Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
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S5.8 |
Sewage from Construction Work
Force Construction work force sewage
discharges on site shall be connected to the existing trunk sewer or sewage
treatment facilities. The construction
sewage shall be handled by portable chemical toilets prior to the commission
of the on-site sewer system.
Appropriate numbers of portable toilets shall be provided by a
licensed contractor to serve the large number of construction workers over
the construction site. The
Contractor shall also be responsible for waste disposal and maintenance
practices. |
Work site / During the
construction period |
Contractor |
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Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
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S5.8 |
Floating Debris and Refuse Collection and removal of floating
refuse shall be performed at regular intervals on a daily basis. The contractor shall be responsible
for keeping the water within the site boundary and the neighbouring water free
from rubbish. |
Work site and adjacent water /
During the construction period. |
Contractor |
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Ö |
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WPCO |
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S5.8 |
Storm Water Discharges Minimum distances of 100 m shall
be maintained between the existing or planned stormwater discharges and the existing
or planned WSD flushing water intakes. |
Work site and adjacent water /
During the design and construction period. |
Contractor |
Ö |
Ö |
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WPCO |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.4 Implementation
Schedule for Waste Management
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EIA Ref |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
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Des |
C |
O |
Dec |
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Construction Phase |
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S6.7.2 |
Marine Sediments The dredged marine sediments would
be loaded onto barges, transported to and disposed of at the designated disposal
sites at South of Cheung Chau, East of Ninepin, East of Tung Lung Chau, South
of Tsing Yi and East of Sha Chau to be allocated by the MFC depending on
their level of contamination or at other disposal sites after consultation
with the MFC and EPD. In accordance with the ETWB TCW No. 34/2002, the
contaminated material must be dredged and transported with great care. The mitigation measures recommended in
Section 5 of the EIA Report shall be incorporated. The dredged contaminated
sediment must be effectively isolated from the environment upon final
disposal and shall be disposed of at the Type 2 confined marine disposal
contaminated mud pit. |
Work site
/ During the construction period |
Contractor |
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Ö |
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ETWB TCW No. 34/2002 |
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S6.7.3 |
It will be the responsibility of
the Contractor to satisfy the appropriate authorities that the contamination
levels of the marine sediment to be dredged have been analysed and
recorded. According to the ETWB TCW
No. 34/2002, this will involve the submission of a formal Sediment Quality
Report to the DEP, at least 3 months prior to the dredging contract being
tendered |
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S6.7.4 |
During transportation and disposal
of the dredged marine sediments requiring Type 1 and Type 2 disposal, the
following measures shall be taken to minimise potential impacts on water
quality: |
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·
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. |
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·
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 DEP. ·
Barges or hopper barges shall not be filled to a level that would
cause the overflow of materials or sediment laden water during loading or
transportation. |
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Good Site Practices Recommendations
for good site practices during the construction activities include: ·
nomination of an approved person, 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 and chemical waste
handling procedures; |
Work site
/ During the construction period |
Contractor |
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Ö |
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Waste
Disposal Ordinance (Cap.354) |
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·
provision of sufficient waste disposal points and
regular collection for disposal; |
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·
appropriate measures to minimise windblown litter
and dust during transportation of waste by either covering trucks or by
transporting wastes in enclosed containers; ·
regular cleaning and maintenance programme for drainage
systems, sumps and oil interceptors; and ·
a recording system for the amount of wastes
generated, recycled and disposed of (including the disposal sites). |
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Waste Reduction Measures 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: ·
Sort C&D waste from demolition of the existing
structures to recover recyclable portions such as metals. |
Work site
/ During planning and design stage, and construction stage |
Contractor |
Ö |
Ö |
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·
Segregation and storage of different types of waste
in different containers, skips or stockpiles to enhance reuse or recycling of
materials and their proper disposal. |
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·
Encourage collection of aluminium cans, PET bottles
and paper by providing separate labelled bins to enable these wastes to be segregated
from other general refuse generated by the work force. |
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·
Any unused chemicals or those with remaining
functional capacity shall be recycled. |
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·
Use of reusable non-timber formwork to reduce the
amount of C&D material. |
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·
Proper storage and site practices to minimise the
potential for damage or contamination of construction materials. ·
Plan and stock construction materials carefully to minimise amount of waste
generated and avoid unnecessary generation of waste. |
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General Refuse General refuse
shall be stored in enclosed bins or compaction units separate from C&D
material. A licensed waste collector
shall be employed by the contractor to remove general refuse from the site,
separately from C&D material.
A collection
area shall be provided where wastes can be stored and loaded prior to removal
from site. An enclosed and
covered area is recommended to reduce the occurrence of 'wind blow' light
material. |
Work site
/ During the construction period |
Contractor |
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Ö |
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Public
Health and Municipal Services Ordinance (Cap. 132) |
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Chemical Wastes After use, chemical
wastes (for example, cleaning fluids, solvents, lubrication oil and fuel)
shall be handled according to the Code of Practice on the Packaging,
Labelling and Storage of Chemical Wastes. Spent chemicals shall be collected by
a licensed collector for disposal at the CWTF or other licensed facility in
accordance with the Waste Disposal (Chemical Waste) (General) Regulation. |
Work site
/ During the construction period |
Contractor |
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Ö |
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Waste
Disposal (Chemical Waste) (General) Regulation Code of Practice
on the Packaging, Labelling and Storage of Chemical Wastes |
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Construction and
Demolition Material C&D
material shall be sorted on-site into inert C&D material (that is, public
fill) and C&D waste. All the suitable inert C&D material shall be
broken down to |
Work site
/ During the construction period |
Contractor |
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Ö |
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ETWB TCW
No. 33/2002, 31/2004, 19/2005 |
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In order to monitor the disposal
of public fill and C&D waste at public filling facilities and landfills,
respectively, and to control fly tipping, a trip-ticket system shall be
included as one of the contractual requirements and implemented by the
Environmental Team undertaking the environmental monitoring and audit
work. An Independent Environment
Checker shall be responsible for auditing the results of the system. |
Work site
/ During the construction period |
Contractor and Independent Environmental
Checker |
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Ö |
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ETWB TCW
No. 31/2004 |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.5 Implementation Schedule for Land Contamination
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EIA Ref |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
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Des |
C |
O |
Dec |
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Construction and Operation Phase |
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S. |
As no potential contaminative land
uses were identified within the Study Area, adverse land contamination
impacts associated with the construction and operation of the Project is not
expected. As such, environmental
protection and mitigation measures are considered not necessary. |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.6 Implementation
Schedule for Marine Ecology
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EIA Ref |
Environmental Protection Measures
/ Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
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Des |
C |
O |
Dec |
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Construction & Operation
Phases |
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S.9.7.1 |
As no adverse ecological
impact on marine habitats and associated wildlife is predicted, no necessary
mitigation measure specific for marine ecology is considered as required in
this assessment. The mitigation
measures recommended in the water quality impact assessment to control water
quality would also serve to protect marine ecological resources from indirect
impacts and ensure no adverse impact on marine life would be resulted from
this designated project. |
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*Des - Design, C - Construction, O – Operation, and Dec -
Decommissioning
Table 13.7 Implementation Schedule for
Landscape and Visual
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EIA Ref |
Environmental Protection Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and Guidelines |
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Des |
C |
O |
Dec |
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Construction Phase |
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Refer
to EIA-058/2001 Table 10.13 |
CM2 Minimisation of works areas. |
Work site
/ During Construction Phase |
Contractor |
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Ö |
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EIAO TM |
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Refer
to EIA-058/2001 Table 10.13 |
CM3 Erection of decorative
hoardings. |
Work site
/ During Construction Phase |
Contractor |
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Ö |
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EIAO TM |
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Refer
to EIA-058/2001 Table 10.13 |
CM4 Control night-time lighting. |
Work site
/ During Construction Phase |
Contractor |
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Ö |
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EIAO TM |
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Refer
to EIA-058/2001 Table 10.13 |
CM5 Minimisation of
disruption to public by effective programming of the works. |
Work site
/ During Construction Phase |
Contractor |
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Ö |
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EIAO TM |
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*Des - Design, C - Construction, O –
Operation, and Dec - Decommissioning