Agreement
No. CE 80/2001(DS)
Drainage
Improvement in Tsuen Wan and Kwai Chung – Tsuen Wan Drainage Tunnel
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EIA Ref. |
Recommended Mitigation Measures |
Who to
implement the measure ? |
Location
of the measure |
When to implement
the measure ? |
What
requirements or standards for the measure to achieve
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Air Quality |
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3.6.1 |
Specific As mentioned in Section
3.5, exceedances of 1-hour and 24-hour average TSP guideline levels have been
predicted at most of the ASRs. Hence,
mitigation measures are considered necessary in order to suppress the
potential dust impact. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
Air Pollution Control (Construction Dust) Regulation |
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The dust suppression
measures set out in the Air Pollution
Control (Construction Dust) Regulation, in fact, are more extensive. Therefore, it is expected that with
watering the construction site every four times daily together with strict
implementation of dust suppression measures as stipulated in the Air Pollution Control (Construction Dust)
Regulation, the dust level is expected to be reduced by over 75%. |
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General To further ensure compliance
with the guideline and AQO limit at the ASRs at all time, it is recommended
to implement the Air Pollution Control
(Construction Dust) Regulation and include good site practice in the
contract clauses to minimize cumulative dust impact. In addition, a comprehensive dust
monitoring and audit programme is recommended to ensure proper implementation
of the identified mitigation measures. Details of the monitoring and audit
requirements are provided in a separate EM&A Manual. |
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·
effective dust
screens, sheeting or netting should be provided to enclose the scaffolding
from the ground floor level of the building or if a canopy is provided at the
first floor level, from the first floor level, up to the highest level of the
scaffolding where a scaffolding is erected around the perimeter of a building
under construction; |
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·
dump truck for
material transport should be totally enclosed by impervious sheeting; |
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·
any excavated dusty
materials or stockpile of dusty materials should be covered entirely by
impervious sheeting or sprayed with water so as to maintain the entire
surface wet, and recovered or backfilled or reinstated within 24 hours of the
excavation or unloading; |
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·
stockpile of
dusty materials should not extend beyond the pedestrian barriers, fencing or
traffic cones; |
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·
dusty materials
remaining after a stockpile is removed should be wetted with water and cleared
from the surface of roads; |
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3.6.1 |
·
the area where
vehicle washing takes place and the section of the road between the washing
facilities and the exit point should be paved with concrete, bituminous
materials or hardcores; |
DSD’s Contractor |
Construction Work Sites |
During Construction |
Air Pollution Control (Construction Dust) Regulation |
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·
where a site
boundary adjoins a road, street or other area accessible to the public, hoarding
of not less than 2.4m high from ground level should be provided along the
entire length except for a site entrance or exit; |
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every main haul
road should be scaled with concrete and kept clear of dusty materials or sprayed
with water so as to maintain the entire road surface wet; |
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the portion of
road leading only to a construction site that is within 30m of a designated
vehicle entrance or exit should be kept clear of dusty materials; |
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·
stockpile of
dusty materials should be either covered entirely by impervious sheeting,
placed in an area sheltered on the top and the 3 sides; or sprayed with water
so as to maintain the entire surface wet; |
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·
all dusty materials
should be sprayed with water prior to any loading, unloading or transfer
operation so as to maintain the dusty material wet; |
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·
vehicle speed
should be limited to 10 kph except on completed access roads; |
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·
every vehicle
should be washed to remove any dusty materials from its body and wheels
before leaving the construction sites; |
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·
the load of
dusty materials carried by vehicle leaving a construction site should be covered
entirely by clean impervious sheeting to ensure that the dusty materials do
not leak from the vehicle; and |
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·
the working area
of excavation should be sprayed with water immediately before, during and immediately
after the operations so as to maintain the entire surface wet. |
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Noise |
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4.6.1 |
During Construction Appropriate mitigation
measures such as the use of quiet equipment and movable barriers will be developed
to ensure that noise can be reduced to acceptable levels without causing
programme delays. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
PN 2/93 Noise from
Construction Activities & EIAO |
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Good Site Practice Good site practice and
noise management can significantly reduce the impact of construction site
activities on nearby NSRs. The
following package of measures should be followed during construction: |
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only well-maintained
plant should be operated on-site and plant should be serviced regularly
during the construction works; |
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·
machines and
plant that may be in intermittent use should be shut down between work periods
or should be throttled down to a minimum; |
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4.6.1 |
·
plant known to
emit noise strongly in one direction should, where possible, be orientated to
direct noise away from the NSRs; |
DSD’s Contractor |
Construction Work Sites |
During Construction |
PN 2/93 & EIAO |
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·
mobile plant
should be sited as far away from NSRs as possible; and |
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material
stockpiles and other structures should be effectively utilised, where practicable,
to screen noise from on-site construction activities. |
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For Drill and Blast Works ·
Charge mass per
delay should be decreased by minimising the number of blastholes firing on
each delay. |
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Smaller blasthole
patterns and longer delays should be used between dependent charges. |
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Times of
blasting should be established to suit the situation and firing blasts when
neighbours are busy with their daily tasks (and at a regular time such as lunch
time). |
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For TBM Tunnelling ·
For the tunnel
excavation, it is anticipated that beyond the initial length (say within
30m), excavation will be carried out well within the tunnel and door should be
provided to further minimize the noise nuisance to the nearby receivers. |
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4.6.2 |
During Operation Good site practice and
noise management can significantly reduce the impact of maintenance
activities on nearby NSRs. The following
package of measures should be followed during
construction: |
DSD’s Contractor |
Project Area |
During Operation |
NCO & EIAO |
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only
well-maintained plant should be operated on-site; |
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·
machines and plant
that may be in intermittent use should be shut down between work periods or
should be throttled down to a minimum; and |
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plant known to
emit noise strongly in one direction should, where possible, be orientated to
direct noise away from the NSRs. |
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Water Quality |
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5.9.1 |
During Construction Mitigation measures and a
spill control and response plan have been prepared for works at the intakes
and work sites. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
Practice Note for
Professional Persons with regard to site drainage (ProPECC PN 1/94) and WQO |
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Precautions to be taken at any time of year when
rainstorms are likely: |
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Temporarily exposed
surfaces should be covered e.g. by tarpaulin. |
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Temporary access
roads should be protected by crushed stone or gravel. |
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Trenches should
be dug and backfilled in short sections. Measures should be taken to minimize
the ingress of rainwater into trenches. |
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Actions to be taken when a rainstorm is imminent or
forecast: |
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Silt removal
facilities, should be checked to ensure that they can function properly. |
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5.9.1 |
·
Open stockpiles
of construction materials on site should be covered with tarpaulin or similar
fabric. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
WQO |
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All temporary
covers to slopes and stockpiles should be secured. |
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Actions to be taken during or after rainstorms: |
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Silt removal
facilities should be checked and maintained to ensure satisfactory working
conditions. |
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Spill
Control and Response Plan |
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1. Prevention and Precaution Measures |
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General Precautions |
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No discharge of
silty water into watercourses. |
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All materials to
be used during construction and operation shall be identified and their hazard
potential evaluated. |
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Maintenance of
vehicles and equipment involving activities with potential for leakage and
spillage shall only be undertaken with the areas appropriately equipped to
control these discharges. |
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Any soil
contaminated with chemicals/oils shall be removed from site and the void
created shall be filled with suitable materials. |
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Any construction
plant which causes pollution to catchwaters or water gathering ground due to leakage
of oil or fuel shall be removed off-site immediately. |
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Suitable
containers shall be used to hold the chemical wastes to avoid leakage or
spillage during storage, handling and transport. |
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Chemical waste containers
shall be suitably labelled to notify and warn the personnel who are handling
the wastes to avoid accidents. |
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Storage areas
shall be selected at safe locations on site and adequate space shall be
allocated to the storage area. |
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Prevent
obstructions and tripping hazards. |
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Storage Precautions |
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All chemical
storage containers shall be correctly labelled. |
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Solid and impermeable
enclosure walls or storage shelves shall be used. |
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Only compatible
chemical wastes shall be stored in the same storage area. |
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The storage areas
shall be inspected to detect any leakages or defective containers on a
regular basis. |
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The condition of
the storage containers shall be checked regularly. |
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Suitable notices
warning of hazards, emergency response plans, telephone numbers etc shall be
posted around the site, including storage areas. |
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Large and heavy
containers shall be stored at ground level. |
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Chemical waste containers
shall be stored below eye level. |
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5.9.1 |
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Adequate space
for handling of the containers shall be provided. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
WQO |
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Spill response kits
shall be located adjacent/near to the storage areas. |
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A log of
chemical wastes shall be maintained. |
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Incompatible
chemicals shall be stored separately. |
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2. Responses/Action
Plan |
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All Workers shall be made
aware of emergency telephone numbers and the location of all relevant
pollution control equipment. Training
be given in emergency response/action plans. The action include the following
steps: |
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Only trained
personnel who are equipped with protective clothing and equipment shall be
allowed to enter the spillage area for clean up. |
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Spills shall be
transferred appropriate back into containers using suitable equipment. |
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Absorbent materials
shall be used to clean up the spills and shall be disposed of as chemical
wastes. |
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Where
appropriate suitable solvents may be used to clean the contaminated area
after removal of all contaminated materials. |
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All necessary
protective devices, safety equipment, containers and clean up materials for
emergency use shall be maintained to a high standard. |
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3. Spill
Clean Up and Disposal |
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Effect
the response plan. |
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Control
the leakage and absorb the spillage using suitably absorbent materials. |
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Provide
safety equipment and personal protective equipment for handling of chemical
wastes would be similar to that for handling of chemicals. |
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Safety equipment includes but is not limited to: |
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Fire
extinguishers. |
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Spades, brushes,
dustpan, mop and bucket (or similar readily available on site). |
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Absorbent material
such as dry sand, tissues and toweling (all materials readily available
on-site). |
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Containers
including plaster bags, drums, etc. |
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Absorbing
materials. |
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Pumps. |
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Personal protective equipment includes as
appropriate: |
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First-aid kits. |
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Safety helmet
and goggles. |
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Gloves which can
resist chemical reaction. |
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Protective boot
and clothing. |
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5.9.1 |
·
Respirators and
gas masks. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
WQO |
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Face visor and
masks. |
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5.9.2 |
Emergency Responses to Spillages Emergency plans and clean up
procedures will need to be provided by the Contractor recognising his
specific working methods and construction programme, activities and
sequences. Agreement must be sought
prior to commencement of the construction work but the following principles
should be considered. |
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The emergency plans should include the procedures
for: ·
spill prevention
and precaution; |
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·
response
actions; and |
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·
spill clean up
and disposal. |
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Spill prevention and precaution embraces good site
practice and covers: |
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·
good
housekeeping practices; |
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chemical storage
requirements; and |
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chemical
transfer and transport. |
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5.9.3 |
During Operation Regular inspection of the
tunnels is essential to monitor the structural integrity and proper
functioning of the drainage tunnel, which allows repairing of structural
deterioration when it begins to develop. It is recommended that routine
inspection shall be carried out at least two times per year for the drainage
tunnel at the beginning and end of wet season from April to September. |
DSD’s Contractor |
Project Area |
During Operation |
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Waste Management |
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6.5.1 |
During Construction Vegetation Removed from Site Clearance Wastes generated from site
clearance shall be sorted and excavated topsoil segregated from roots for
re-use in landscaping works, thus eliminating the need for off-site disposal. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
Waste Disposal Ordinance
(Cap.354); Waste Disposal (Chemical Wastes) (General) Regulation (Cap 354)
and ETWBTC No. 15/2003, Waste Management on Construction Site |
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Construction and Demolition
Materials The Contractor should reuse
any C&D material on-site. C&D waste should be segregated and stored
in different containers to other wastes to encourage the re-use or recycling
of materials and their proper disposal. The use of wooden hoardings shall not
be allowed. An alternative material,
which can be reused or recycled, for example, metal (aluminium, alloy, etc)
shall be used. |
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6.5.1 |
As referred to the section
6.4.1, the 317,936m3 of inert surplus material generated by the project
is suitable for public fill. The public fill reception facility at Tuen Mun
Area 38 provides a suitable facility for the reuse of surplus inert C&D
material generated from the project. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
WDO (Cap.354), ETWBTC No.
15/ 2003, ETWBTC No. 12/2002 and ETWBTC No. 31/2004 |
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Under the contract, the
contractor will be required to minimise the generation of C&D material
and reuse it on site through the following: |
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(a) to plan
in the design and construction, methods to minimise the generation of C&D
material; |
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(b) to
submit a Waste Management Plan (WMP) in accordance with Environment Transport
and Works Bureau Technical Circular (ETWBTC) No. 15/2003 or any superseding
circular(s); |
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(c) to reuse
recycled aggregates in accordance with ETWBTC No. 12/2002 or any superseding
circular(s); |
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(d) to
observe the requirements of the Trip-Ticket System, stipulated in ETWBTC No. 31/2004
or any superceding circular(s), for disposal of C&D material; |
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(e) to
incorporate a Waste Management System into the WMP for effective management
and control of C&D materials to avoid/reduce/minimise the generation of
C&D material during construction. |
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The contractor will be required to
properly sort into inert C&D materials, metals, timber and other
non-inert C&D material in the workplace to prevent cross-contamination. |
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In addition, DSD will conduct site
inspection to monitor the contractors’ performance in the implementation of
the WMP and other relevant specified requirements. |
DSD |
Construction Work Sites |
During Construction |
WDO (Cap.354) and ETWBTC
No. 15/2003 |
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DSD’s Contractor |
Construction Work Sites |
During Construction |
WDO (Cap.354) and ETWBTC
No. 15/2003 |
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Excavated materials should be
segregated from other wastes to avoid contamination thereby ensuring acceptability
at public filling areas and avoiding the need for disposal at landfill. |
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Temporary refuse collection facilities
should be set-up by the contractor and wastes should be stored in appropriate
containers prior to collection and disposal. |
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Domestic effluent generated by the
workforce will be directed to foul sewer or chemical toilets if public
facilities are not available. |
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6.5.1 |
Waste
Management Plan A Waste Management Plan (WMP) for the
construction of the Project should be prepared as part of the contractors
submission. It will provide
recommendations for appropriate recycling or disposal route and should include
method statement for stockpiling and transportation of the excavated material
and other construction wastes should also be included in the WMP and approved
before the commencement of construction. All mitigation measures arising from
the approved WMP shall be fully implemented. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
WDO (Cap.354), ETWBTC No.
15/2003 and ETWBTC No. 33/2002 |
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For the purpose of enhancing the management of
C&D material including rock, and to minimize its generation at source, a
C&D Material Management Plan (C&DMMP) has been prepared for this
project and would be processed in accordance with the Environment, Transport
and Works Bureau Technical Circular (Works) No. 33/2002 - Management of Construction
and Demolition Material Including Rock. |
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Ecology |
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7.7.1 |
Avoidance The surface structures are
located mainly on existing disturbed areas (ie pollution and urbanisation) and
have generally avoided the natural stream sections of higher species
diversity and abundance of aquatic organisms. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
EIAO |
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The major construction
activities at streams are scheduled to avoid wet season of high water flow
which may adversely affect the downstream natural habitats due to the
construction runoff. |
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7.7.2 |
Minimisation The previous discussion in Section
7.6.4 has indicated that the impacts on ecological resources due to the
construction and operation of the proposed Project are generally expected to
be low. The following mitigation
measures to minimise impacts and disturbance to the surrounding habitats, are
recommended. |
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Measures for Construction Runoff |
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Install sheet
piles/cofferdam/weir along the boundary of the works area within the stream habitats
in particular Sam Dip Tam Stream and Tso Kung Tam Stream before the
commencement of works to prevent construction runoff during
construction. Provision of adequate
designed sand/ silt removal facilities such as sand traps, silt traps and
sediment basin in the areas which could potentially be affected may be
required. |
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Good Construction Practice |
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Erect fences along the
boundary of the works area before the commencement of works to prevent tipping,
vehicle movements, and encroachment of personnel onto adjacent areas,
particularly the stream habitats. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
EIAO |
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Avoid any damage and
disturbance, particularly those caused by filling and illegal dumping, to the
remaining and surrounding natural stream habitats. |
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Regularly check the work
site boundaries to ensure that they are not breached and that no damage
occurs to surrounding areas. |
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Prohibit and prevent open
fires within the site boundary during construction and provide temporary fire
fighting equipment in the work areas. |
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Treat any damage that may have
occurred to individual major trees in the adjacent area with surgery. |
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Reinstate temporary work
sites/disturbed areas, particularly stream of natural bottom and bank,
plantation, intertidal habitat, and the areas located within the proposed
Ecological Park, immediately after
completion of the construction works, ie through on-site tree/shrub planting
and reprovision of natural or semi-natural bottom (also refer to Section
7.7.3), in order to facilitate the recolonisation of the wildlife recorded
during the baseline surveys. Tree/shrub species used should make reference
from those in the surrounding area. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
EIAO |
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7.7.3 |
Compensation Provide natural stream bed (approximately
0.03 ha) for the new Dry Weather Flow Channel (created from village-orchard)
by laying natural stones at Intake I-2 (Figure 7.7). The reinstated stream bed shall mimic the
existing natural conditions with certain portion of big boulders creating the
lentic and lotic zones for the aquatic fauna, and while it will be developed
during detailed design may draw on concepts shown in Figure 2.18. |
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Provide natural stream bed (approximately
0.5 ha,) for the Approach Channel and Dry Weather Flow Channel by laying
natural stones at Intake I-3 (Figure 7.8).
The reinstated stream bed shall mimic the existing natural conditions
(rocky bottom with very limited aquatic plants) with certain portion of big
boulders creating the lentic and lotic zones for the aquatic fauna, and while
it will be developed during detailed design may draw on concepts shown in
Figure 2.18. |
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Provide natural bottom (ie retain
the existing stream bed or reinstate the stream bed by providing boulders/
rocks, riprap or gabion) for the temporarily affected stream sections (Figure
7.8) in order to allow natural colonisation of aquatic fauna. |
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Provide at least 2.2 ha of
compensatory planting on the permanent and temporary affected plantation
areas, particularly the slopes along access road and adjacent to Intake I-3
and cascade at Outfall O-1, after construction to stabilise the slope to
present soil erosion and consequent stream sedimentation. Among the 2.2 ha compensatory planting, at
least 0.5 ha of compensatory tree planting on the new formed slope along the
access road of the Intake I-3 and 0.5 ha of compensatory tree planting over
the cascade (by constructing intermediate platform) at Outfall O-1 will be
provided (location refer to Figures 7.4 – 7.6). Species used for planting should take
reference from the species identified in Appendix F and be native to Hong
Kong or South China region. |
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Provide armour rocks for
the affected intertidal habitat in order to allow natural colonisation of
intertidal organisms. |
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Cultural Heritage |
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8.6 |
As no impacts on recorded
archaeological sites or area with archaeological potential were identified
within the Study Area, no mitigation measure for archaeological resources is
considered necessary. |
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The construction methods to
be employed should seek to avoid potential vibration impacts to Kuen Yuen
Tung Monastery at Lo Wai, the Western Monastery, Yuen Yuen Home for the Aged,
Hong Hoi Chee Hong Temple, Chiu Yum Tsing Yuen, Tse’s Grave, Wan Lin Bridge and
Sam Dip Tam Rock Carving in Sam Dip Tam and the Tin Hau Temple, Yam Kom Tau
Village Rural Committee and the Yeung’s Ancestral Hall in Yau Kom Tau as
these sites fall within 50 m of the Preferred Option of the drainage tunnel
alignment or associated Intakes/Outfall construction activities. Construction works that generates excessive
vibration in close proximity to these sites should be restricted to protect
the building from adverse vibration impacts and to ensure that the building
structures will not be damaged as a result of these impacts. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
EIAO |
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In order to ensure that no
structural or superficial damage will be caused by the construction activities,
a precautionary approach involving a pre-construction condition survey and
establishment of appropriate vibration limits for the potentially impacted
structures should be adopted. Protection measures for the potentially
impacted structures, if considered necessary from the pre-construction
condition survey, should be implemented prior to the commencement of
construction works. Vibration
monitoring during the construction phase should be undertaken as part of the
EM&A programme. |
Qualified archaeologist/
built heritage specialist |
Construction Work Sites |
Pre-construction |
EIAO |
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Fisheries |
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10.6 |
In accordance with the
guidelines in the EIAO-TM on
fisheries impact assessment the general policy for mitigating impacts to fisheries,
in order of priority are avoidance, minimization and compensation. |
DSD’s Contractor |
Construction Work Sites |
During Construction |
EIAO |
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Impacts to fisheries
resources and fishing operations have largely been avoided during the construction
and operation of the drainage tunnel through the avoidance of dredging,
reclamation and filling activities. Good construction practice and associated
measures were recommended in Water Quality Assessment in Section 5 to control
water quality impacts to within acceptable levels and are also expected to
control impacts to fisheries resources.
Hence, no fisheries-species mitigation measures are required during
construction and operation of the drainage tunnel. |
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