13.1.1
This chapter presents
the implementation schedule of mitigation measures for the Project. Table
13.1 summarizes the details of the recommended
mitigation measures for all works areas. For each recommended mitigation
measures, both the location and timing for the measure have clearly been identified
as well as the parties responsible for implementing the measure and for
maintenance (where applicable).
Table 13.1 Implementation Schedule of
Mitigation Measures
|
EIA Ref. |
Recommended Mitigation Measures |
Location of the Measures |
Implementation Agent |
Implementation Phase |
Relevant Legislation and
Guidelines |
||||
|
Detailed Design |
Construction |
Operation |
|||||||
|
Air Quality (Construction Phase) |
|||||||||
|
4.7.1 |
To ensure compliance
with the relevant standards, dust suppression measures stipulated in the Air
Pollution Control (Construction Dust) Regulation and good site practices
should be incorporated into the contract document to control potential dust
emission from the site. The major dust
suppression measures include: ·
Use of regular watering to reduce dust emissions from exposed site
surfaces and unpaved roads, particularly during dry weather. ·
Use of frequent watering for particularly dusty construction areas and
areas close to ASRs. ·
Side enclosure and covering of any aggregate or stockpiling of dusty
material to reduce emissions. Where
this is not practicable owing to frequent usage, watering shall be applied to
aggregate fines. ·
Tarpaulin covering of all dusty vehicle loads transported to, from and
between site locations. ·
Establishment and use of vehicle wheel and body washing facilities at
the exit points of the site. ·
Provision of not less than ·
Imposition of speed controls for vehicles on site haul roads. ·
Where possible, routing of vehicles and positioning of construction
plant should be at the maximum possible distance from ASRs. ·
Instigation of an environmental monitoring and auditing program to
monitor the construction process in order to enforce controls and modify
method of work if dusty conditions arise. |
All works areas |
WSD/Contractor |
|
ü |
|
Air Pollution Control Ordinance and Air Pollution Control
(Construction Dust) Regulation |
||
|
Air Quality (Operation Phase) |
|||||||||
|
N/A |
N/A |
N/A |
N/A |
|
|
|
|
||
|
Noise (Construction Phase) |
|||||||||
|
5.6.4- 5.6.6 |
Recommended
Mitigation Measures for Construction Noise Good
Site Practice Although
the noise mitigation effects are not easily quantifiable and the benefits may
vary with site conditions and operating conditions, good site practices are
easy to implement and do not impact upon the works schedule. The site practices listed below should be
followed during each phase of construction: ·
Only well-maintained plant should be operated on-site and plant should
be serviced regularly during the construction program ·
Silencers or mufflers on construction equipment should be utilized and
should be properly maintained during the construction phase ·
Mobile plant, if any, should be sited as far from NSRs as possible ·
Machines and plant (such as trucks) that may be in intermittent use
should be shut down between work periods or should be throttled down to a
minimum ·
Plant known to emit noise strongly in one direction should, wherever
possible, be orientated so that the noise is directed away from the nearby
NSRs ·
Material stockpiles and other structures should be effectively
utilized, wherever practicable, in screening noise from on-site construction
activities. Adoption of Quiet PME In
order to reduce the excessive noise impacts at the affected NSRs during normal
daytime working hours, quieter PME are recommended. The Contractor may use other types of quiet
plant instead of specific items of quiet plant adopted in this assessment,
which have the same total SWL, to meet their needs. Quiet PME adopted in the assessment were
taken from the BS5228: Part 1:2009 or the noise specification of the plant
provided from the supplier, and the PME are known to be available in Hong
Kong. Quiet PME that have been adopted
in the assessment are summarised in Table 5.6 and the proposed mitigated
plant inventory for the demolition/construction works of the Project is
detailed in Appendix 5.6. Use of Movable Noise Barrier The
use of movable noise barrier for certain PME could further alleviate the
construction noise impacts. In
general, 5 dB(A) reduction for movable PME and 10
dB(A) for stationary PME can be achieved depending on the actual design of
movable noise barrier. The Contractor
shall be responsible for design of the movable noise barrier with due
consideration given to the size of the PME and the requirement of
intercepting the line of sight between the NSRs and PME. Barrier material of surface mass in excess
of 14 kg/m2 is recommended to achieve the predicted screening effect. |
All works areas |
WSD/Contractor |
|
ü |
|
Noise Control Ordinance |
||
|
Noise (Operation Phase) |
|||||||||
|
5.6.11 |
Recommended
Mitigation Measures for Fixed Plant Noise Provided
that the fixed plants are properly designed to meet the maximum allowable SWLs,
therefore, no adverse residual impacts would be predicted. However, it is still recommended that the
following noise reduction measures be considered as far as practicable during
the processes of detailed design and procurement: ·
Choose quieter plant such as those which have been effectively
silenced; ·
Include noise levels specification when ordering new plant (including
chillier and E&M equipment); ·
Locate fixed plant/louver away from any NSRs as far as practicable; ·
Locate fixed plant in walled plant rooms or in specially designed
enclosures; ·
Locate noisy machines in a basement or a completely separate building; ·
Install direct noise mitigation measures including silencers, acoustic
louvers and acoustic enclosure where necessary; and ·
Develop and implement a regularly scheduled plant maintenance
programme so that equipment is properly operated and serviced in order to
maintain controlled level of noise.
The programme should be implemented by properly trained personnel. |
Fixed plants |
WSD/ Detailed Design Consultant |
ü |
|
ü |
Noise Control Ordinance |
||
|
Water Quality (Construction Phase) |
|||||||||
|
6.8.1 - 6.8.14 |
Construction
Site Run-off and General Construction Activities The site practices outlined in ProPECC PN 1/94 “Construction Site Drainage” should be
followed to minimise surface run-off and the chance of erosion. Effluent discharged from the construction
site should comply with the standards stipulated in the TM-DSS. The following
measures are recommended to protect water quality and sensitive uses of the
inland and coastal waters, and when properly implemented should be sufficient
to adequately control site discharges so as to avoid water quality impacts: Construction Site Run-off ·
Surface run-off from construction sites should be discharged into
storm drains via adequately designed sand/silt removal facilities such as
sand traps, silt traps and sedimentation basins. Channels or earth bunds or sand bag
barriers should be provided on site to properly direct stormwater to such
silt removal facilities. Perimeter
channels at site boundaries should be provided where necessary to intercept
storm run-off from outside the site so that it will not wash across the site. Catchpits and
perimeter channels should be constructed in advance of site formation works
and earthworks. ·
Silt removal facilities, channels and manholes should be maintained
and the deposited silt and grit should be removed regularly, at the onset of
and after each rainstorm to prevent local flooding. Any practical options for the diversion and
re-alignment of drainage should comply with both engineering and
environmental requirements in order to provide adequate hydraulic capacity of
all drains. Minimum distances of 100 m should be maintained between the discharge
points of construction site run-off and the existing saltwater intakes. While
the locations of the discharge points of construction site run-off have not
been confirmed at the current stage, the discharge points are confirmed to be
located within the construction site boundary. The nearest seawater intake
from the construction site within the same watershed would be the Sha Tin WSD flushing water intakes, which is located at Sha Tin Hoi (5 km away). It is anticipated that the
minimum separation between the discharge points of construction site effluent
and the existing seawater intakes would be satisfied. ·
Construction works should be programmed to minimize soil excavation
works in rainy seasons (April to September) as far as practicable. If excavation in soil cannot be avoided in
these months or at any time of year when rainstorms are likely, for the
purpose of preventing soil erosion, temporary exposed slope surfaces should
be covered e.g. by tarpaulin, and temporary access roads should be protected
by crushed stone or gravel, as excavation proceeds. Intercepting channels should be provided
(e.g. along the crest / edge of excavation) to prevent storm run-off from
washing across exposed soil surfaces.
Arrangements should always be in place in such a way that adequate
surface protection measures can be safely carried out well before the arrival
of a rainstorm. ·
Earthworks final surfaces should be well compacted and the subsequent
permanent work or surface protection should be carried out immediately after
the final surfaces are formed to prevent erosion caused by rainstorms. Appropriate drainage like intercepting
channels should be provided where necessary. ·
Measures should be taken to minimize the ingress of rainwater into
trenches. If excavation of trenches in wet seasons is necessary, they should
be dug and backfilled in short sections.
Rainwater pumped out from trenches or foundation excavations should be
discharged into storm drains via silt removal facilities. ·
Open stockpiles of construction materials (e.g. aggregates, sand and
fill material) on sites should be covered with tarpaulin or similar fabric
during rainstorms. ·
Manholes (including newly constructed ones) should always be adequately
covered and temporarily sealed so as to prevent silt, construction materials
or debris from getting into the drainage system. Wheel Washing Water ·
All vehicles and plant should be cleaned before they leave a
construction site to minimize the deposition of earth, mud, debris on
roads. A wheel washing bay should be
provided at every site exit if practicable and wash-water should have sand
and silt settled out or removed before discharging into storm drains. The section of construction road between
the wheel washing bay and the public road should be paved with backfall to reduce vehicle tracking of soil and to prevent site run-off from
entering public road drains. Wastewater from Building
Construction ·
Before commencing any demolition works, all drainage connections should
be sealed to prevent building debris, soil, sand etc. from entering drains. ·
Wastewater generated from building construction activities including
concreting, plastering, internal decoration, cleaning of works and similar
activities should not be discharged into the stormwater drainage system. If the wastewater is to be tankered off site for disposal into foul sewers, it
should undergo the removal of settleable solids in
a silt removal facility, and pH adjustment as necessary. Acid Cleaning, Etching and Pickling
Wastewater ·
Acidic wastewater generated from acid cleaning, etching, pickling and
similar activities should be neutralized to within the pH range of 6 to 10.
The neutralized wastewater should be tankered off
site for disposal into foul sewers or treated to a standard acceptable to
storm drains and the receiving waters. Effluent Discharge ·
There is a need to apply to EPD for a discharge licence for discharge
of effluent from the construction site under the WPCO. The discharge quality
must meet the requirements specified in the discharge licence. All the
run-off and wastewater generated from the works areas should be treated so
that it satisfies all the standards listed in the TM-DSS. Minimum distances
of 100 m should be maintained between the discharge points of construction
site effluent and the existing seawater intakes. The nearest seawater intake
from the construction site within the same watershed would be the WSD
flushing water intakes, which is located at Sha Tin Hoi (5 km away). It is
anticipated that the minimum separation between the discharge points of
construction site effluent and the existing seawater intakes would be
satisfied. The beneficial uses of the treated effluent for other on-site
activities such as dust suppression, wheel washing and general cleaning etc.,
can minimise water consumption and reduce the effluent discharge volume. If
monitoring of the treated effluent quality from the works areas is required
during the construction phase of the Project, the monitoring should be carried
out in accordance with the relevant WPCO licence which is under the ambit of
regional office of EPD. |
All works areas |
WSD/ Contractor |
|
ü |
|
ProPECC PN 1/94 Construction Site Drainage TM-DSS Water Pollution Control Ordinance |
||
|
6.8.15-6.8.17 |
Accidental
Spillage ·
Any service shop and maintenance facilities should be located on hard
standings within a bunded area, and sumps and oil
interceptors should be provided. Maintenance of vehicles and equipment
involving activities with potential for leakage and spillage should only be
undertaken within the areas appropriately equipped to control these
discharges. ·
Disposal of chemical wastes should be carried out in compl -
Suitable
containers should be used to hold the chemical wastes to avoid leakage or
spillage during storage, handling and transport. -
Chemical
waste containers should be suitably labelled, to notify and warn the
personnel who are handling the wastes, to avoid accidents. -
Storage
area should be selected at a safe location on site and adequate space should
be allocated to the storage area. |
All works areas |
WSD/ Contractor |
|
ü |
|
Waste Disposal Ordinance Waste Disposal (Chemical Waste) (General) Regulation The Code of Practice on the Packaging, Labelling and Storage of
Chemical Wastes |
||
|
6.8.18-6.8.19 |
Sewage Effluent from Construction Workforce ·
The construction workforce on site will generate sewage. It is recommended that all the sewage
generated from the workforce should be properly treated by interim treatment
facilities, such as chemical toilets.
Interim treatment facilities should be properly maintained to avoid
adverse impact upon the nearby water environment. |
All works areas |
WSD/ Contractor |
|
ü |
|
Water Pollution Control Ordinance |
||
|
6.8.20 |
Construction Works in Close Proximity of Inland
Water ·
Construction works would be carried out in close proximity of inland
water courses along Project site. To minimize the potential water quality
impacts from the construction works near any water courses, the practices
outlined in ETWB TC (Works) No. 5/2005 “Protection of Natural Streams/rivers
from Adverse Impacts arising from Construction Works” should be adopted where
applicable.
Relevant mitigation measures are listed below: -
Temporary storage of materials (e.g. equipment,
filling materials, chemicals and fuel) and temporary stockpile of
construction materials should be located well away from any water courses
during carrying out of the construction works.
-
Stockpiling of construction materials and dusty
materials should be covered and located away from any water courses. -
Shoring should be properly erected as appropriate
to prevent soil/ mud from slipping into the watercourses. Stockpiles should be properly covered. -
Construction debris and spoil should be covered
up and/or disposed of as soon as possible to avoid being washed into the
nearby water receivers. -
Construction activities, which generate large
amount of wastewater, should be carried out in a distance away from the
waterfront, where practicable. -
Hoarding should be erected along the site boundary
to protect the nearby watercourses. |
All works areas |
WSD/ Contractor |
|
ü |
|
Water Pollution Control Ordinance |
||
|
6.8.21 - 6.8.22 |
Groundwater ·
If deployment of wastewater treatment is not feasible for handling the
contaminated groundwater, groundwater recharging wells should be installed as
appropriate for recharging the contaminated groundwater back into the ground.
The recharging wells should be selected at places where the groundwater
quality would not be affected by the recharge operation as indicated in
Section 2.3 of the TM-DSS. The baseline
groundwater quality should be determined
prior to the selection of the recharge wells, and a working plan should be
submitted to EPD for agreement.
Pollution levels of groundwater to be recharged shall not be higher
than pollutant levels of ambient groundwater at the recharge well. Groundwater
monitoring wells should be installed near the recharge points to monitor the
effectiveness of the recharge wells and to ensure that no likelihood of
increase of groundwater level and transfer of pollutants beyond the site
boundary. Prior to recharge, free products should be removed as necessary by
installing the petrol interceptor. The
Contractor should apply for a discharge licence under the WPCO through the
Regional Office of EPD for groundwater recharge operation or discharge of
treated groundwater. |
All works areas |
WSD/ Contractor |
|
ü |
|
Water Pollution Control Ordinance |
||
|
Water Quality (Operation Phase) |
|||||||||
|
6.8.23 – 6.8.24 |
Emergency Overflow ·
Standby treatment facilities, such as parallel trains in flash mixing basins,
backwash pumps and pumps in the inter-stage booster pumping station, would be
provided to prevent the occurrence of overflow as a result of equipment
failure or maintenance. ·
Dual power supply should be provided. Dual power supply could be in
the format of ring main, or an automatic-operated emergency generator with
sufficient capacity to cope with the demand loading of the essential plant
equipment. Inlet valve feeding raw water would be closed manually within 30
minutes by the operator-in-charge in case of equipment or power failure. |
|
WSD/ Contractor |
|
|
ü |
Water Pollution Control Ordinance |
||
|
Waste Management (Construction Phase) |
|||||||||
|
7.6.1-7.6.3 |
Good Site Practices ·
Appropriate waste handling, transportation and disposal methods for
all waste arisings generated during the
construction works for the Project should be implemented to ensure that
construction wastes do not enter the nearby streams or drainage channel. ·
It is anticipated that adverse impacts would not arise on the
construction site, provided that good site practices are strictly
followed. Recommendations for good
site practices during the construction activities include: -
Nomination
of approved personnel, such as a site manager, to be responsible for good
site practices, and making arrangements for collection of all wastes
generated at the site and effective disposal to an appropriate facility. -
Training
of site personnel in proper waste management and chemical waste handling
procedures. -
Provision
of sufficient waste reception/ disposal points, of a suitable vermin-proof
design that minimises windblown litter. -
Arrangement
for regular collection of waste for transport off-site and final 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. -
A
recording system for the amount of wastes generated, recycled and disposed
(including the disposal sites) should be proposed. -
A
Waste Management Plan should be prepared and should be submitted to the
Engineer for approval. One may make
reference to ETWB TCW No. 19/2005 for details. ·
In order to monitor the disposal of C&D material at landfills and
public filling areas, as appropriate, and to control fly tipping, a
trip-ticket system should be included as one of the contractual requirements
to be implemented by an Environmental Team undertaking the Environmental
Monitoring and Audit work. One may
make reference to DEVB TCW No.6/2010 for details. |
All works areas |
Contractor |
|
ü |
|
Waste Disposal Ordinance, DEVB TCW No. 6/2010, ETWB TCW No. 19/2005 |
||
|
7.6.4- 7.6.5 |
Waste Reduction Measures ·
Good management and control of construction site activities/ processes
can minimise the generation of waste.
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: -
Segregate
and store different types of construction related waste in different
containers, skips or stockpiles to enhance reuse or recycling of materials
and their proper disposal. -
Provide
separate labelled bins to segregate recyclable waste such as aluminium cans
from other general refuse generated by the work force, and to encourage
collection by individual collectors. -
Any
unused chemicals or those with remaining functional capacity shall be
recycled. -
Maximising
the use of reusable steel formwork 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. -
Adopt
proper storage and site practices to minimise the potential for damage to, or
contamination of, construction materials. -
Plan
the delivery and stock of construction materials carefully to minimise the
amount of waste generated. -
Minimize
over ordering of concrete, mortars and cement grout by doing careful check
before ordering. ·
In addition to the above measures, other specific mitigation measures
are recommended below to minimise environmental impacts during handling,
transportation and disposal of wastes.
|
All works areas |
WSD/ Contractor |
ü |
ü |
|
Waste Disposal Ordinance, ETWB TCW No. 19/2005 |
||
|
7.6.6- 7.6.11 |
Construction and Demolition Material ·
The C&D material generated
from demolition works of existing facilities of the South Works, construction
works of new facilities for the North and the South Works, slope excavation
works and construction works of new access roads should be sorted on-site into
inert C&D material (that is, public fill) and C&D waste. To minimise the impact resulting from
collection and transportation of C&D material for off-site disposal, any
excavated material should be reused on-site as backfilling material as far as
practicable. C&D waste, such as wood, plastic, steel and other metals
should be reused or recycled and, as a last resort, disposed of to
landfill. A suitable area should be
designated within the site for temporary stockpiling of C&D material and
to facilitate the sorting process.
Within the stockpile areas, the following measures should be taken to
control potential environmental impacts or nuisance: -
Covering
material during heavy rainfall; -
Locating
stockpiles to minimise potential visual impacts; and -
Minimising
land intake of stockpile areas as far as possible. ·
For the disposal of any surplus inert C&D materials, the Project
Proponent shall notify CEDD of the estimated spoil volumes to be generated,
and liaise and agree with the PFC. The finalized
C&DMMP has been endorsed by the WSD Vetting Committee on C&DMM in its
meeting on 12 November 2012. Consents on the endorsed C&DMMP and EIA
report were obtained from the PFC on 3 January 2013, 26 August 2013 and 30
September 2014. No construction work is allowed until consensus has been made
on the overall management and disposal arrangements be endorsed by the
relevant authorities such as PFC and EPD. General Refuse ·
General refuse should be stored in enclosed bins or compaction units
separate from C&D material. A reputable
waste collector should be employed by the contractor to remove general refuse
from the site, separately from C&D material. An enclosed and covered area is preferred
to reduce the occurrence of 'wind blown' light
material. Chemical Wastes ·
All storage of asbestos waste should be carried out properly in a
secure place isolated from other substances so as to prevent any possible
release of asbestos fibres into the atmosphere and contamination of other
substances. The storage area should bear warning panels to alert people of
the presence of asbestos waste. ·
A licensed asbestos waste collector will be appointed to collect the
asbestos waste and deliver to the designated landfill for disposal. The
Project Proponent should notify EPD in advance for disposal of asbestos
waste. After processing the notification, EPD will issue specific
instructions and directions for disposal. The waste producer must strictly
follow these directions. ·
If chemical wastes were to be produced at the construction site, the
Contractor would be required to register with the EPD as a Chemical Waste
Producer, and to follow the guidelines stated in the Code of Practice on the
Packaging, Labelling and Storage of Chemical Wastes. Good quality containers compatible with the
chemical wastes should be used, and incompatible chemicals should be stored
separately. Appropriate labels should
be securely attached on each chemical waste container indicating the
corresponding chemical characteristics of the waste, such as explosive,
flammable, oxidizing, irritant, toxic, harmful, corrosive, etc. The Contractor shall use a licensed
collector to transport the chemical wastes.
The licensed collector shall deliver the waste to the Chemical Waste
Treatment Centre at Tsing Yi, or other licenced facility, in accordance with the Waste Disposal
(Chemical Waste) (General) Regulation. ·
A summary of the various waste types likely to be generated during the
construction works for the Project, together with the recommended handling
and disposal methods is provided. |
All works areas |
Contractor |
|
ü |
|
Waste Disposal Ordinance Waste Disposal (Chemical Waste) (General) Regulation Public Health and Municipal Services
Ordinance (Cap. 132) - Public Cleansing and Prevention of Nuisances
Regulation Land (Miscellaneous Provisions)
Ordinance Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes Packaging, Labelling and Storage of
Chemical Wastes |
||
|
Waste Management (Operation Phase) |
|||||||||
|
N/A |
N/A |
N/A |
N/A |
|
|
|
|
||
|
Ecology (Construction Phase) |
|||||||||
|
8.8.1 |
According to the EIAO-TM Annex 16 and
EIAO Guidance Note. 3/2010, ecological impacts on important habitats and the
associated wildlife caused by the proposed development should be mitigated by,
in order of priority, avoidance, minimization, and compensation approaches to
the maximum practical extent. |
All works areas in particular
important habitats |
WSD/Contractor |
ü |
ü |
|
EIAO-TM |
||
|
8.8.2 |
Measures to Avoid/Minimize Impact to Woodland ·
About 90% of the works area is situated
within the existing Sha Tin WTW is of low
ecological value. The impact to
natural habitat is minimized. In
addition, the design of the Project has been revised to avoid and minimize
the impact to secondary woodland habitat.
Retaining wall behind the future WTW Logistics Centre has been adopted
under the current design to minimize impact to woodland. The presence of the bored pile wall would
save about 1,400m2 of woodland at the concerned location (Refer to
Figure 8.5 as illustration). The slope stabilization work adjacent to the
proposed access road at the northern boundary of works area would be
constructed by retaining wall instead of soil nails. This would reduce the amount of vegetation
removal required and thereby minimize the footprint of the slope at the
woodland habitat. |
ü |
ü |
|
EIAO-TM |
||||
|
8.8.3-8.8.4 |
Measures to Avoid/Minimize Impact to Flora Species of Conservation
Importance ·
Vegetation survey revealed that Incense Tree (Aquilaria sinensis)
and Ailanthus (Ailanthus fordii) within the works area were relatively large
in size (2 – 13 m in height) and grown on hillside. The affected individuals
will be transplanted as far as practicable. |
ü |
ü |
|
EIAO-TM |
||||
|
8.8.5-8.8.6 |
Measures to Avoid/Minimize Impact to Bat Roosting Site ·
Evidence of Short-nosed Fruit Bat (Cynopteris sphinx) roosting activity was
recorded within the works area. In
order to avoid impacts on this species, trees showing evidence of roosting
activity should be retained where possible.
Where Chinese Fan-palm (Livistona chinensis) removal is required, these should be
checked by suitably qualified ecologist with over 7 years relevant experience
for roosting bats prior to their removal.
If roosting bats are observed, a strategy for passive removal will be
agreed with the AFCD and implemented.
This could include undertaking the works just after the bats have left
the roost (i.e. dusk). ·
The inclusion of Chinese Fan-palm of similar
size as the affected plant within the areas of compensatory planting or other
suitable areas is recommended to replace affected specimens, and compensate
for the impact to roosting opportunities for this bat species. |
ü |
ü |
|
EIAO-TM |
||||
|
8.8.7 |
Measures to Minimize Disturbance Impact In general, the disturbance impacts to
terrestrial habitat and associated wildlife arising from the land-based
construction activities could be minimized by adopting the following
mitigation measures: ·
Use of Quiet Mechanical Plant during the construction phase should be
adopted wherever possible. ·
Hoarding or fencing should be erected around the works area boundaries
during the construction phase. The
hoarding should screen adjacent habitats from construction phase activities,
reduce noise disturbance to these habitats and also to restrict access to
habitats adjacent to works areas by site workers. ·
Regular spraying of haul roads to minimize impacts of dust deposition
on adjacent vegetation and habitats during the construction activities. |
|
ü |
|
EIAO-TM |
||||
|
8.8.8 |
Measures to Avoid/Minimize Impact to Watercourse To minimize the contamination of
wastewater discharge, accidental chemical spillage and construction site run-off
to the receiving water bodies, mitigation measures such as diverting the site
runoff to silt trap facilities before discharging into storm drain, proper
waste and dumping management and standard good site practice for land-based
construction: ·
The works areas would be reinstated immediately after completion of
works; ·
Waste skips should be provided to collect general refuse and
construction wastes. The wastes should
be disposed of in a timely and appropriate manner; ·
Drainage arrangements should include sediment traps to collect and
control construction run-off; ·
Open burning on works sites is illegal, and should be strictly
prohibited; and ·
Only well-maintained plant should be operated on site and plant should
be serviced regularly during the construction programme. |
|
ü |
|
EIAO-TM |
||||
|
8.8.9-8.8.11 |
Woodland Compensation ·
The Project would unavoidably result in
permanent impact to approximately 0.69 ha of secondary woodland habitat with
high ecological value. To compensate for
the impact, potentially suitable location for woodland compensation within
the Project site has been exhausted. On-site compensation of about 0.23 ha
would be provided considering the site constraint of limited space for the
proposed works. To further reduce the impact, off-site woodland compensation
in the vicinity of the Project site has been extensively explored. The bare
slope areas along Tai Po Road (Sha Tin Heights to
the north of Sha Tin WTW) have been explored. It is
understood that the gradient of the slope areas are steep and engineered
slopes having concrete faced and slope retaining structure. Therefore, they
are considered not suitable for tree planting purpose in accordance with GEO
publication No. 1/2011 – Technical Guidelines on Landscape Treatment and
Bio-engineering for Man-made Slopes and Retaining Walls. ·
Approximately 0.29 ha off-site woodland
compensation at Sha Tin South Freshwater Service
Reservoir and Sha Tin West Service Reservoir would
also be adopted. The impact to woodland would therefore be mitigated with
provision of total woodland compensation area of about 0.52 ha (Figure 8.5 and Figure 8.6
refer). The locations for woodland
compensation are specifically chosen to increase the ecological and
structural linkage with the nearby woodland.
It also serves as a buffer area to screen out the disturbance arising
from the Sha Tin WTW operation. Flora species used
for woodland compensation would be similar to those native species recorded
within the woodland nearby (Table 8.23
refers). For the proposed offsite
woodland compensation at Sha Tin South Freshwater
Service Reservoir, planting would be applied on the existing flat area where
the paved concrete surface would be removed for planting works. According to
Appendix A of ETWB TCW No.2/2004 Maintenance of
Vegetation and Hard Landscape Features, the proposed on-site and
off-site compensation woodland will be managed and maintained by the project
proponent (i.e. WSD). ·
For some kind of whips, since lead time is required for native seedling
production, local suppliers of native species such as Kadoorie
Farm and Botanical Garden should be contacted in advance.
The implementation details and management requirement of the woodland
compensation area would be provided in Woodland Compensation Plan (WCP),
which would be submitted for approval prior to commencement. |
ü |
ü |
|
|
||||
|
Ecology (Operation Phase) |
|||||||||
|
N/A |
N/A |
N/A |
N/A |
|
|
|
|
||
|
Landscape and Visual (Construction Phase) |
|||||||||
|
9.8.1 |
Existing
trees to be retained on site shall be carefully protected during
construction. Trees unavoidably
affected by the works shall be transplanted as far as possible in
accordance with DEVB TCW No. 10/2013 – Tree Preservation. |
All works areas |
WSD |
|
ü |
|
DEVB TCW No. 10/2013, EIAO TM |
||
|
9.8.1 |
Compensatory
Planting shall be provided in accordance with DEVB TCW No. 10/2013 – Tree
Preservation. |
All works areas |
WSD |
|
ü |
|
DEVB TCW No. 10/2013, EIAO TM |
||
|
9.8.1 |
Control
of night-time lighting glare. |
All works areas |
WSD |
|
ü |
|
EIAO TM |
||
|
9.8.1 |
Erection
of decorative screen hoarding compatible with the surrounding setting. |
All works areas |
WSD |
|
ü |
|
EIAO TM |
||
|
9.8.1 |
Management
of facilities on work sites which give control on the height and
disposition/arrangement of all facilities on the works site to minimize
visual impact to adjacent VSRs. |
All works areas |
WSD |
|
ü |
|
EIAO TM |
||
|
Landscape and Visual (Operation Phase) |
|||||||||
|
9.8.1 |
Aesthetically
pleasing design as regard to the form, material and finishes shall be
incorporated to proposed permanent aboveground structures of the project so as
to blend in the structures to the adjacent landscape and visual context. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004 |
||
|
9.8.1 |
Buffer
Tree and Shrub Planting to screen the proposed structures. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004, ETWB TC No.
7/2002 |
||
|
9.8.1 |
Landscape
Enhancement of affected area with amenity planting where practical. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004, ETWB TC No.
7/2002 |
||
|
9.8.1 |
Vertical
Greening shall be incorporated to soften the proposed structures where
practical. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004 |
||
|
9.8.1 |
Green
Roof shall be proposed to enhance the landscape quality of the structures and
mitigate any potential visual impact on adjacent VSRs. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004 |
||
|
9.8.1 |
Landscape
Treatments on slope to enhance the landscape and visual amenity value of the
proposed man made slopes. |
Within the site boundary |
WSD |
ü |
|
ü |
ETWB TCW 2/2004, ETWB TC No.
23/93, ETWB TC No. 12/2000 and GEO Publication No. 1/2011 |
||
|
9.8.1 |
Woodland
mix planting (within the site and off-site) (refer to Figures 8.5 and 8.6) |
Within the site boundary and off site in Sha Tin
South Freshwater Service Reservoir and Sha Tin West
Service Reservoir at Po Fook Shan |
WSD |
ü |
|
ü |
ETWB TCW 2/2004, ETWB TC No.
23/93, ETWB TC No. 12/2000 and GEO Publication No. 1/2011 |
||
|
Cultural Heritage (Construction Phase) |
|||||||||
|
10.6.1-10.6.2 |
As no impact is anticipated for the three graded
historic buildings in Hin Tin village, no mitigation measure is therefore
required for them. It is noted that the nearest
Works Area to the Ex KCR Beacon Hill Tunnel would involve only refurbishment
works for four existing staff quarters as construction site office without
major construction works (Refer to Figure
2.1 and Figure 10.1) during
construction phase (Refer to Section 10.5.3).
The possible piling and drilling activities of the new administration
building would take place at approximately 120 m away (horizontally)
(and 8 m vertically) from the
tunnel portal (Refer to Figure 10.1). As a
precautionary measure, a peak particle velocity (ppv)
limit of 7.5mm/s is recommended, measuring at the façade wall of tunnel portal and inside the tunnel where it is closest to
the Works Area during piling and drilling works. |
Work site |
WSD/Contractor |
|
ü |
|
EIAO-TM |
||
|
Cultural Heritage (Operation Phase) |
|||||||||
|
N/A |
N/A |
N/A |
N/A |
|
|
|
|
||
|
Land Contamination (Construction Phase) |
|||||||||
|
11.7.1-11.7.6 |
Review of
Remediation Options, Methods and Targets ·
Based on the findings of SI, if contamination is found, appropriate
remediation methods should be investigated. The following factors should be
considered when evaluating different remediation methods: -
Nature and level of contamination; -
Extent of contamination; -
Site characteristics (such as site hydrogeology,
soil and groundwater chemical characteristics); -
Site constraints (such as available space,
surrounding areas); and -
Time available for remediation. ·
Remediation options applicable to the Project site should be addressed
based on the following criteria: -
Technical and cost effectiveness; -
Technology development status; -
Environmental benefits and disbenefits; -
Commercial availability; -
Experience; and -
Expertise requirement. ·
According to the CAP, the potential contaminants at the Project site
will be determined after site investigation works. Towards the potential
contaminants, the applicability and limitations of potential remediation
techniques for soil and groundwater for this Project are listed. ·
For any contamination found, in-situ remediation measures and possible
recycling and reuse of remediated materials should be considered as the
preferred remediation options whereas ex situ remediation the second. Due to
limited space in landfills, offsite disposal to landfill will only be
considered as the last resort. For any soil or groundwater contaminated with
both organic carbon and heavy metals, the remediation method should be chosen
with caution as certain contaminants present may affect the effectiveness of
other remediation methods. ·
Closure assessment should be carried out to confirm the completion of
remediation of the Project site and ensure that the soil and groundwater are
treated to meet the cleanup targets. Confirmatory samples should be collected
to analyze for the targeted contaminants. RR shall be submitted to EPD to
report on the remediation process and demonstrate that contaminated soils and
groundwater are all treated to meet the relevant standards or properly
handled. All relevant information,
including details of closure assessment, sampling results, photographs and
certification of independent checker, the quantities of treated soil and
recovered free product, final backfill site of treated soil and disposal site
of free product shall be included in the RR. ·
According to the findings from desktop review and site appraisal, if
land contamination was identified, the impact should not be insurmountable as
the remediation options recommended in the Practice Guide would be
applicable. |
Within the site boundary where
signs of contamination are identified |
WSD/ Contractor |
|
ü |
|
Guidance Note for Contaminated Land Assessment and Remediation Guidance Manual for Use of Risk-based Remediation Goals for
Contaminated Land Management (Guidance Manual) |
||
|
11.7.7- 11.7.8 |
Proposed
Precautionary Measures to Be Undertaken during Construction |
Other site areas with no SI
proposed |
|
|
ü |
|
|
||
|
11.7.9- 11.7.10 |
Recommended
Health and Safety Measures and Environmental Mitigation Measures during
Remediation ·
In order to minimise the potentially environmental impacts arising
from the handling of potentially contaminated materials, the following
environmental mitigation measures are recommended during the course of the
Project site remediation: -
Excavation profiles must be properly designed and
executed with attention to the relevant requirements for environment, health
and safety; -
Excavation should be carried out during dry
season as far as possible to minimise contaminated runoff from contaminated
soils; -
Supply of suitable clean backfill material is
needed after excavation; -
In case chemicals are used in remediation, they
should be stored securely, separately and away from sources of ignition or oxidizable items.
Handling should be undertaken by persons specifically trained and
wearing appropriate PPE. -
Vehicles containing any excavated materials
should be suitably covered to limit potential dust emissions or contaminated
wastewater run-off, and truck bodies and tailgates should be sealed to
prevent any discharge during transport or during wet conditions; -
Speed control for the trucks carrying
contaminated materials should be enforced; -
Vehicle wheel and body washing facilities at the
Project site’s exit points should be established and used; and -
Pollution control measures for air emissions,
noise emissions, and water discharges should be implemented and complied with
relevant regulations and guidelines. -
Set up a list of safety measures for site
workers; -
Provide written information and training on
safety for site workers; -
Keep a log-book and plan showing the contaminated
zones and clean zones; -
Maintain a hygienic working environment; -
Avoid dust generation; -
Provide face and respiratory protection gear to
site workers if necessary; -
Provide personal protective clothing (e.g.
chemical resistant jackboot, liquid tight gloves) to site workers if
necessary; and -
Provide first aid training and materials to site
workers. |
Within the site boundary where
signs of contamination are identified |
|
|
ü |
|
Occupation Safety and Health Ordinance |
||
|
Land Contamination (Operation Phase) |
|||||||||
|
N/A |
N/A |
N/A |
N/A |
|
|
|
|
||
|
Hazard to Life (Construction Phase, Onsite Hazards) |
|||||||||
|
Table 12.22 |
Good
Practice Measures to Protect Reprovisioning Workers |
|
|
|
ü |
|
EIAO-TM |
||
|
|
1.
Ensure speed limit enforcement
is specified in the contractor's Method Statement to limit the speed of
construction vehicles on site; |
All works areas |
Engineer/WSD |
|
|
|
|
||
|
|
2.
Develop an audit procedure
to ensure enforcement of speed limits and to ensure adequate site access
control; |
All works areas |
Engineer/WSD |
|
|
|
|
||
|
|
3.
Ensure construction
Method Statement is endorsed by the
Engineer and WSD; |
All works areas |
Engineer/WSD |
|
|
|
|
||
|
|
4.
Ensure designated
manoeuvring area for the new access road construction to be away from the
Chlorination House; |
New access road area |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
5.
Provide training for
both chlorine delivery vehicle drivers and construction vehicles drivers to
ensure the right access route is used at any stage during the reprovisioning
activities; |
All works areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
6.
Ensure that the emergency
response plan and procedures (including drills) cover the reprovisioning
activities; |
All works areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
7.
Safety training to
be provided to construction workers and WSD/Engineer staff regarding evacuation
procedures; |
All works areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
8.
Ensure
communication protocol is in place between construction and operation staff
with regard to the change of chlorine delivery route and the switchover from the
existing to new chlorinated water piping; |
All works areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
9.
Ensure temporary
suspension of crane operation and construction truck movements during
chlorine delivery; |
All works areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
10.
Provide a crash
barrier between the construction site and the north side of the Chlorination House; |
Chlorination House area |
Engineer/WSD |
|
|
|
|
||
|
|
11.
Conduct vibration monitoring
at the Chlorination House during piling activities to ensure vibration levels
are acceptable and will not lead to any damage of the Chlorination House; |
Chlorination House area |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
12.
Dedicated person to
supervise the crossover between the construction access and operational
access routes; |
Site gate and any other potential crossover areas |
WSD/Engineer/Contractor |
|
|
|
|
||
|
|
13.
Civil engineering calculation
to be performed to confirm differential settlement from excavation work is within acceptable limits for the
Chlorination House; |
Chlorination House area |
Engineer/WSD |
|
|
|
|
||
|
|
14.
Provide settlement monitoring
for the Chlorination House to ensure no subsidence occurs from nearby
excavation works; |
Chlorination House area |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
15.
Confirm the chlorine
concentration for the chlorinated water before the switchover from the
existing to new piping. This is to avoid the potential for chlorine gas
vapours being released if the concentration is too high and there is spillage
during switchover; |
Chlorinated water piping |
WSD |
|
|
|
|
||
|
|
16.
Develop an
operating procedure for performing the chlorinated water switchover from the
existing piping to new piping; |
All works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
17.
Ensure the
location/height of the tower crane is such there is no impact on Chlorination
House/chlorine delivery route in case of falling, swinging or dropped load; |
Chlorination House area |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
18.
Ensure the location/height
of the lifting equipment is such there is no impact on Chlorination
House/chlorine delivery route in case of falling, swinging or dropped load; |
Chlorination House area |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
19.
Implement the controlled
demolition of the existing E&M workshop to ensure that any steel
structural elements can only fall away from the Chlorination House; |
Existing E&M Workshop and Chlorination House areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
20.
Confirm whether
slope/boulder stabilisation is required along the chlorine delivery route; |
Work areas along the chlorine delivery route |
Engineer/WSD |
|
|
|
|
||
|
|
21.
Conduct vibration monitoring
at the slopes with potential for slope/boulder disturbance located close to
chlorine delivery route; |
Work areas along the chlorine delivery route |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
22.
Stop any construction
activities which may lead to vibrations and potential slope/boulder
disturbance during the chlorine deliveries; |
All works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
23.
Installation of
chlorine gas monitors with audible alarms in the relevant reprovisioning work
areas; |
Reprovisioning works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
24.
Provision of an
accompanying vehicle for the chlorine truck on the WTW site and ensuring that
during the chlorine drums delivery construction works are stopped and the
construction workers moved away from Chlorination House; |
Chlorine delivery route and all works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
25.
Establish a liaison
between the contractor and HKCG and develop a chlorine/town gas emergency
plan to ensure gas safety during the Construction Phase; |
Beacon Hill North Gas Offtake
Station and Gas Pipelines in Old Beacon Hill Tunnel |
WSD/Engineer /Contractor/HKCG |
|
|
|
|
||
|
|
26.
Temporarily suspend
chlorine delivery during the short period of construction of the concerned
section of elevated walkway to avoid mobile crane impact on the chlorine
truck; |
Not applicable |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
27.
Instruct the
construction team and chlorine delivery team to suspend operation in case of
concurrent operation and this clause will be added to the respective
contractor’s contract; |
All works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
28.
Provide clear road
signs for site vehicles |
Chlorine Delivery Route and reprovisioning works
access roads |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
29.
Large
equipment/plant movement should be controlled by “Permit-to-move” system |
All works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
30.
Define restricted
zone for the equipment (i.e. keep the equipment from the Chlorination
Building at a safe distance). The extent of the restricted zone would be
determined by the size of the equipment |
Chlorination House area |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
31.
Locate the
construction site office at or near property boundary away from the
Chlorination House as far as possible |
Construction Office area |
WSD/Engineer /Contractor |
|
|
|
|
||
|
|
32.
The number of
workers on-site should be kept to the minimum required to maintain the
construction programme. Entry of non-authorized personnel to the construction
site to be prohibited |
All works areas |
WSD/Engineer /Contractor |
|
|
|
|
||
|
Hazard to Life (Operation Phase, Onsite Hazards) |
|||||||||
|
N/A |
N/A |
|
|
|
|
|
|
||
|
Hazard to Life (Construction and Operation Phases,
Offsite Transport of chlorine) |
|||||||||
|
12.15.4, 12.18.1, 12.22.9 |
1.
GPS fleet management
system with driver training to help enforce truck speeds |
Chlorine delivery trucks, fleet
management centre |
WSD/Relevant Authorities/Chlorine Supply Contractor |
|
ü |
ü |
EIAO-TM |
||
|
2.
Improved clamps with
independent checks to prevent load shedding |
Chlorine delivery trucks |
|
ü |
ü |
|
||||
|
3.
Installation of
fire screen and larger fire extinguishers to prevent engine and wheel fires
from spreading to the cargo area |
Chlorine delivery trucks |
|
ü |
ü |
|
||||
|
4.
Adoption of the
chlorine delivery route from Sham Shui Kok Dock to Sha Tin WTW (as described in Section 12.18) |
Chlorine delivery route |
|
ü |
ü |
|
||||
|
5.
Provision of
emergency repair kit |
Chlorine delivery trucks |
|
ü |
ü |
|
||||
|
Note: the above
improvements are either already implemented or are currently in progress and
will be in place before commencement of the project. These formed the basis
of the assessment. |
|
|
|
|
|
||||
|
Section12.34.3, Tables 12.37
and 12.38 |
1.
It is recommended to ban the use of
retreaded tyres and perform regular visual checks
on the tyres. This measure should be implemented
before the start of the reprovisioning project (Item 2.8 of Table 12.37). |
Chlorine delivery trucks |
WSD/Relevant Authorities/Chlorine Supply Contractor |
|
ü |
ü |
EIAO-TM |
||
|
|
2.
It is recommended to have a vehicle
accompanying chlorine truck along critical road sections in Sha Tin. The vehicle should be equipped with emergency
kit, fire extinguisher, radio set for communication (Item 4.4 of Table
12.37). The accompanying vehicle will be ahead of the chlorine truck after
the vehicles entering the water treatment works site. - An accompanying
vehicle may provide rapid response to an incident (collision, fire, etc.) but
any action would be limited to containing a small leak. |
Chlorine delivery trucks |
|
|
ü |
ü |
|
||
|
|
3.
It is recommended to limit fuel tanks capacity
at the beginning of the Project (Item 2.3 of Table 12.37 – advance measure). |
Chlorine delivery trucks |
|
|
ü |
ü |
|
||
|
|
4.
It is recommended to further review the
practicality of reducing combustible materials or use of fire retardant materials
in the cab. (Item 2.3 of Table 12.37 – further measure) |
Chlorine delivery trucks |
|
|
ü |
ü |
|
||
|
|
5.
Annual periodic radiography or
ultrasonic test inspections of the chlorine drums should be considered for implementation
as soon as feasible (Item 3.8 of Table 12.37). |
Chlorine drums |
|
|
ü |
ü |
|
||
|
|
6.
It is recommended to implement side,
front and rear crash guards with high energy absorption in coordination and accordance
with the relevant authorities. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
7.
It is recommended to implement a sturdy
steel frame to minimise the potential for chlorine
release due to truck rollover. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
12.34.4 |
The following additional recommendations relating to
the transport of Chlorine from SSK dock to Sha Tin
WTW have been made to ensure the risk remains in the ALARP region: |
|
WSD/Relevant Authorities/Chlorine Supply Contractor |
|
ü |
ü |
EIAO-TM |
||
|
|
1.
WSD will continue to keep under
review the latest development of use of alternative disinfectants in water
supply industry to aim at minimising on-site chlorine storage. |
Chlorine Delivery Route |
|
|
|
|
|
||
|
|
2.
Training should be provided for
the use of the GPS fleet management and improved safe driving. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
3.
It should be ensured that
independent checks are performed to ensure proper chlorine drum latching and clamping. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
4.
Chlorine truck drivers or
driver attendants should be further trained to check and detect potential
chlorine leaks during transport. This should include the timely application of
the emergency kit. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
5.
Training should be provided to
driver and driver attendant for the emergency use of the new 2 × 9L AFFF
extinguishers. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
6.
Induction training for new
drivers and driver attendant should include familiarisation with the route,
familiarisation with chlorine risks, defensive driving, application of
emergency kits, use of fire extinguishers and emergency response. |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
7.
Provision of a fire screen
between the cab and cargo as well as fire retardant materials for the wheel
arches on the chlorine truck should be planned and provided; and |
Chlorine delivery trucks |
|
|
|
|
|
||
|
|
8.
To keep under review alternate
chlorine receiving dock in Sha Tin/Tai Po area for
chlorine delivery to STWTW. |
Chlorine delivery trucks |
|
|
|
|
|
||
~ End of
Section 13 ~