13
IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION
MEASURES
Table
13.1 Implementation
Schedule for Air Quality Control
|
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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S |
Four times a day watering of the
work site with active operations. |
Work
site / during construction |
Contractor |
|
Ö |
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|
EIAO-TM |
|
S |
Implementation of dust suppression
measures stipulated in Air Pollution Control (Construction Dust)
Regulation. The following
mitigation measures, good site practices and a comprehensive dust monitoring
and audit programme are recommended to minimise cumulative dust impacts. ·
Strictly
limit the truck speed on site to below ·
Watering
during excavation and material handling; ·
Provision
of vehicle wheel and body washing facilities at the exit points of the site,
combined with cleaning of public roads where necessary; and |
Work
site / during construction |
Contractor |
|
Ö |
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·
Tarpaulin
covering of all dusty vehicle loads transported to, from and between site
locations. |
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Operational Phase |
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|
S |
The design parameters of the East and |
East and |
HyD |
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Ö |
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S |
Air quality monitoring for the operation performance of the |
East Vent Shaft / During operation of the |
HyD |
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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
|
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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S |
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 |
|
Ö |
|
|
EIAO-TM, NCO |
|
S |
Use of quiet powered mechanical
equipment, movable noise barrier and temporary noise barrier for the
following tasks: ·
Slip road 8 tunnel ·
Construction of diaphragm wall and
substructures of the tunnel approach ramp ·
Excavation ·
Construction of slabs ·
Backfill |
Work Sites / During Construction |
Contractor |
|
Ö |
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|
EIAO-TM, NCO |
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|
·
Demolition and construction
of substructures for the IEC ·
Demolition works of existing
piers and crossheads of the marine section of the existing IEC Use of PME grouping for the following tasks: ·
At-grade road construction ·
Substructure for IECL connection |
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Operation Phase |
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S4.8.12 – S4.8.23 |
For Existing NSRs · about · about · about · about · about · low noise road surfacing for the trunk road (except tunnel section
and beneath the landscaped deck at the eastern portal area) with speed limit
of |
Near North Point / Before commencement of
operation of road project |
HyD |
Ö |
Ö |
Ö |
|
EIAO-TM |
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For Future/Planned NSRs · about |
In between the Electric Centre (next to |
HyD |
Ö |
Ö # |
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· The openable
windows of the temple, if any, should be orientated so as to avoid direct line of sight to the existing |
Near Causeway Bay Fire Station / During
detailed design of the
re-provisioned |
Project Proponent for the re-provisioned |
Ö |
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S4.5.21 |
· All the ventilation fans installed in East Ventilation Building (EVB) and Central Ventilation Building (CVB) will be provided with silencers. |
EVB: At the North Point waterfront
/ Before commencement of
operation of the ventilation building CVB: Near the junction of |
HyD |
Ö |
Ö |
Ö |
|
EIAO-TM |
* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
# Only the steel frame for this section of
noise semi-enclosure would be erected in advance during the construction of the
westbound slip road.
Table 13.3 Implementation
Schedule for Water Quality Control
|
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 |
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. 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. A
sediment tank
constructed from pre-formed individual cells of approximately 6 ‑ Open stockpiles of
construction materials (for examples, aggregates, sand and fill material) of
more than |
Work
site / During the construction period |
Contractor |
|
Ö |
|
|
ProPECC PN
1/94; WPCO (TM-DSS) |
|
S5.8 |
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. 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. |
Work
site / During the construction period |
Contractor |
|
Ö |
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|
ProPECC PN
1/94; WPCO (TM-DSS) |
|
S5.8 |
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. |
Work
site / During the construction period |
Contractor |
|
Ö |
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ProPECC PN
1/94; WPCO (TM-DSS) |
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|
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. |
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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 |
|
Ö |
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ProPECC PN 1/94; WPCO (TM-DSS) |
|
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 |
|
Ö |
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WPCO |
|
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 |
|
Operation Phase |
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S5.8 |
For the operation of CWB, a
surface water drainage system would be provided to collect road runoff. The following operation stage mitigation
measures are recommended to ensure road runoff would comply with the TM under
the WPCO: |
CWB/During
design and operational period |
HyD/TD3 |
Ö |
|
Ö |
|
WPCO |
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·
The drainage from tunnel sections shall be directed through petrol interceptors
to remove oil and grease before being discharged to the nearby foul water
manholes. ·
Petrol interceptors shall be regularly cleaned and maintained in good
working condition. ·
Oily contents of the petrol interceptors shall be properly handled and
disposed of, in compliance with the requirements of the Waste Disposal
Ordinance. ·
Sewage arising from ancillary facilities of CWB (for examples, car
park, control room, ventilation and administration buildings and tunnel
portals) shall be connected to public sewerage system. Sufficient capacity in public sewerage
shall be made available to the proposed facilities. ·
Road drainage shall also be provided with adequately designed silt
trap to minimize discharge of silty runoff. ·
The design of the operational stage mitigation measures for CWB shall
take into account the guidelines published in ProPECC PN 5/93 “Drainage Plans
subject to Comment by the EPD.” All operational discharges from the CWB into
drainage or sewerage systems are required to be licensed by EPD under the
WPCO. |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
3 if employ Management, Operation and
Maintenance (MOM) Contract
Table
13.4 Implementation
Schedule for Waste Management
|
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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S6.5.14 |
Floating Refuse During the construction phase, the
project proponent’s contractor will be responsible for the collection of any
refuse within their works area. Floating booms will be provided on the water
surface to confine the refuse from the working barges as well as to avoid the
accumulation of pollutants within temporary embayment as mentioned in Table
13.3. |
Work site
/ During the construction period |
Contractor |
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Ö |
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S6.6.1 |
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; ·
provision of sufficient waste disposal points and
regular collection for disposal; ·
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). |
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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S6.6.2 |
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: ·
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; ·
to encourage collection of aluminium cans, PET bottles and paper,
separate labelled bins shall be provided to segregate these wastes from other
general refuse generated by the work force; ·
any unused chemicals or those with remaining functional capacity shall
be recycled; ·
use of reusable non-timber formwork, such as in casting the tunnel box
sections, to reduce the amount of C&D material. ·
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 and stock construction materials carefully to minimise amount of
waste generated and avoid unnecessary generation of waste. |
Work site
/ During planning and design stage, and construction stage |
Contractor |
Ö |
Ö |
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S6.6.4 |
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 |
|
Ö |
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Public
Health and Municipal Services Ordinance (Cap. 132) |
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S6.6.5 |
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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S6.6.6 |
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 250 mm in size for reuse as public fill in the WDII
reclamation. C&D waste, such
as wood, glass, plastic, steel and other metals shall be reused or recycled
and, as a last resort, disposed of to landfill. A suitable area shall be designated to
facilitate the sorting process and a temporary stockpiling area will be
required for the separated materials. |
Work site
/ During the construction period |
Contractor |
|
Ö |
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ETWB TCW
No. 33/2002, 31/2004, 19/2005 |
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S6.6.7 |
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 |
|
Ö |
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ETWB TCW
No. 31/2004 |
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S6.6.8 |
Bentonite Slurry The disposal of residual used
bentonite slurry shall follow the good practice guidelines stated in ProPECC
PN 1/94 “Construction Site Drainage” and listed as follows: ·
If the disposal of a certain residual quantity cannot be avoided, the
used slurry may be disposed of at the marine spoil grounds subject to
obtaining a marine dumping licence from EPD on a case-by-case basis. ·
If the used bentonite slurry is intended to be disposed
of through the public drainage system, it shall be treated to the respective
effluent standards applicable to foul sewers, storm drains or the receiving
waters as set out in the Technical Memorandum of Standards for Effluents
Discharged into Drainage and Sewerage Systems, Inland and Coastal Waters. ·
If the used bentonite slurry is intended to be
disposed to public fill reception facilities, it will be mixed with dry soil
on site before disposal. |
Work site
/ During the construction period |
Contractor |
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Ö |
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ProPECC
PN 1/94 |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.5 Implementation
Schedule for Land Contamination
|
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.7.1.1 |
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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- |
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* Des - Design, C - Construction, O
– Operation, and Dec - Decommissioning
Table 13.6 Implementation
Schedule for Marine Ecology
|
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 identified, no necessary
mitigation measure 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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- |
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*Des - Design, C - Construction, O –
Operation, and Dec - Decommissioning
Table 13.7 Implementation
Schedule for Landscape and Visual
|
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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Table 10.5 |
CM1 Topsoil, where identified, shall be
stripped and stored for re-use in the construction of the soft landscape
works, where practical. |
Work site
/ During Construction Phase |
Contractor |
Ö |
Ö |
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EIAO TM |
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Table 10.5 |
CM2 Existing trees to be retained on site
shall be carefully protected during construction. |
Work site
/ During Construction Phase |
Contractor |
Ö |
Ö |
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EIAO TM |
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|
Table 10.5 |
CM3 Trees unavoidably affected by the works
shall be transplanted where practical. |
Work site
/ During Construction Phase |
Contractor |
Ö |
Ö |
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|
EIAO TM |
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|
Table 10.5 |
CM4 Compensatory tree planting shall be
provided to compensate for felled trees. |
Work site
/ During Construction Phase |
Contractor |
Ö |
Ö |
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EIAO TM |
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Table 10.5 |
CM5 Control of night-time lighting. |
Work site
/ During Construction Phase |
Contractor |
|
Ö |
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|
EIAO TM |
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Table 10.5 |
CM6 Erection of decorative screen hoarding
compatible with the surrounding setting. |
Work site
/ During Construction Phase |
Contractor |
|
Ö |
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EIAO TM |
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Operation Phase |
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Table 10.6, Figure |
OM1 Aesthetic design of buildings
and road-related structures, including viaducts, vent buildings, subways, footbridges
and noise barriers and enclosure. |
Work site
/ During Design Stage and Operation Phases |
HyD |
Ö |
Ö |
Ö |
|
ETWB
TCW 2/2004 |
|
|
Table 10.6, Figure |
OM3
Buffer
Tree and Shrub Planting to screen proposed roads and associated structures. |
Work site
/ During Design Stage and Operation Phases |
HyD |
Ö |
Ö |
Ö |
|
ETWB
TCW 2/2004 |
|
|
Table 10.6, Figure |
OM5
Aesthetic
streetscape design. |
Work site
/ During Design Stage and Operation Phases |
HyD |
Ö |
Ö |
Ö |
|
ETWB
TCW 2/2004 |
|
|
Table 10.6, Figure |
OM6 Aesthetic
design of roadside amenity areas. |
Work site
/ During Design Stage and Operation Phases |
HyD |
Ö |
Ö |
Ö |
|
ETWB TCW
2/2004 |
|
*Des - Design, C - Construction, O –
Operation, and Dec - Decommissioning