Table 13.1 Implementation Schedule for Land Contamination
|
EIA Ref # |
Environmental Protection
Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
|||
|
Des |
Sl/ Dem |
Ex |
Tre |
|||||
|
S.4.96 & S.4.214 S.4.97 S.4.95, S.4.222 & S.4.290 S.4.222 S.4.158–S.4.160 S.4.158 & S.4.206- S.4.219 S.4.214 S.4.220 S.4.221-S.4.222 S.4.223-S.4.265 S.4.239-S.4.243 S.4.251-S.4.256 S.4.265 |
Site
decontamination and Soil remediation ·
Where free product is detected at groundwater surface at during
excavation, the free product shall be skimmed off, containerised and disposed
of properly. Monitoring of free
product and sampling/analysis of groundwater shall be conducted to ensure
complete removal of the free product. ·
Where dewatering is necessary during excavation, the groundwater shall
be recharged within 10m of the extraction point and below the water
table. Regular monitoring of groundwater
level at various locations shall be undertaken to ensure insignificant
migration of contaminant in groundwater or soils due to locally risen
groundwater level. ·
Personal protective equipment (PPE) shall be used by site workers
during soil excavation / free product skimming / groundwater dewatering. ·
Excavated areas shall be fenced off to restrict unauthorised entrance. ·
All contaminated soils at CLS shall be excavated and treated on site
or transported out of the site for off-site treatment. ·
After excavation, confirmation sampling and testing shall be conducted
to ensure complete excavation of contaminated soils. ·
Contaminated soils shall be sorted and handled with respect of their
contamination. ·
Precautionary measures shall be implemented to avoid environmental
nuisance during excavation. ·
Health and safety plan for excavation shall be followed. ·
The following remediation processes shall be applied for different
types of soil contamination: -
Biopiling for TPH/SVOCs contamination; -
Cement solidification for metal contamination; and -
Thermal desorption for dioxin contamination. ·
Upon completion of biopile treatment, confirmation sampling and
testing shall be undertaken for biopile closure assessment to ensure the
cleanup targets have been attained. ·
Upon completion of solidification treatment, confirmation sampling and
testing shall be undertaken to ensure the cleanup targets have been attained. ·
Upon completion of thermal desorption process, confirmation sampling
and testing shall be undertaken to ensure the cleanup target has been
attained. ·
Mitigation measures for air quality and water quality impacts
associated with the site decontamination and soil remediation works are
presented in the relevant sections of this schedule. |
At CLS / During Soil Excavation At CLS / During Soil Excavation At CLS / During Soil
Excavation At CLS / During Soil
Excavation At CLS and/or TKW / During Design, Soil Excavation, & Soil
Treatment At CLS / During Design
& Soil Excavation At CLS / During Soil Excavation At CLS / During Soil Excavation At CLS / During Soil Excavation At CLS and/or TKW / During Design, Soil Excavation, & Soil
Treatment At TKW / During Design & Soil Treatment At CLS & TKW / During Design & Soil Treatment At TKW / During Design & Soil Treatment |
Contractor Contractor Contractor Contractor CED / Contractor CED / Contractor Contractor Contractor Contractor CED / Contractor CED / Contractor CED / Contractor CED / Contractor |
3 3 3 3 3 3 |
|
3 3 3 3 3 3 3 3 3 3 |
3 3 3 3 3 |
Occupational Safety & Health Ordinance; Guidelines on Occupational
Exposure |
|
S.4.290 |
Health and Safety Measures (General) ·
During the course of the site remediation, the following basic health
and safety measures shall be implemented as far as practicable: -
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; -
Prohibit eating and cooking inside the contaminated zones; -
Avoid dust generation; -
Provide face and respiratory protection gear to site workers; -
Provide personal protective clothing (e.g. chemical resistant
jackboot, liquid tight gloves) to site workers; and -
Provide first aid training and materials to site workers. |
At CLS & TKW sites / During Soil Excavation & Soil Treatment |
Contractor |
|
|
3 |
3 |
Occupational Safety & Health Ordinance; Guidelines on Occupational
Exposure |
|
S.4.291-S.4.294 |
Personal
Protective Equipment for Workers during Excavation of Dioxin-contaminated
Soil The workers
engaged in the excavation of dioxin-contaminated soil shall put on
appropriate PPE to minimise the exposure to the carcinogens via inhalation,
ingestion and dermal contact: ·
An air
purifying respirator; ·
Latex
gloves; ·
Protective
clothing. If other
contaminants are identified or the levels of contaminant are expected to be
very high, a higher level of protection, such as self-supplied respirators,
space suit, may be required. |
At CLS / During Soil Excavation |
Contractor |
|
|
3 |
|
Occupational Safety & Health Ordinance; Guidelines on Occupational
Exposure |
|
S.4.295 |
Safety Measures for Handling Dioxin-containing Residue Storage and conveyance of dioxin-containing residue shall be
undertaken in accordance with the relevant Dangerous Goods Ordinance. |
At TKW / During Soil Treatment |
Contractor |
|
|
|
3 |
Dangerous Goods Ordinance |
# All recommendations and requirements resulted
during the course of EIA/EA Process, including ACE and / or accepted public comment
to the proposed project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment
Table 13.2 Implementation Schedule for Air Quality Control
|
EIA Ref # |
Environmental Protection
Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
|||
|
Des |
Slo/ Dem |
Exc |
Tre |
|||||
|
S5.75 |
General Measures for Construction Sites ·
Dust mitigation measures stipulated in the Air Pollution Control (Construction Dust) Regulation shall be incorporated to control dust emission.
Notice shall be given to the authority prior to commencing of work. |
CLS, slope behind CLS and TKW /
During building demolition, slope improvement soil excavation and setting up
of treatment plant |
Contractor |
|
3 |
3 |
3 |
Air Pollution Control (Construction Dust) Regulation |
|
S5.76 |
Transportation from CLS to TKW ·
Dioxins
contaminated soils shall be transported in enclosed roll-off truck with
sealable top, which shall be delivered to enclosed material handling shed and
storage areas. In addition,
material handling process such as screening and crushing shall be conducted
in an enclosed environment. ·
General
contaminated soils transported to the storage bin at TKW by truck shall be properly
covered with impermeable sheeting to minimize wind erosion and fugitive
emission. The storage bin shall
be fully enclosed on four sides and top to eliminate dust emission. |
Haul road between CLS
and TKW/ During soil transportation and unloading |
Contractor |
|
|
3 |
3 |
|
|
S5.76 |
Soil Excavation ·
Excavation of dioxins contaminated soils shall be limited to 200 m3/hr;
whereas excavation of styrene and chromium VI contaminated soils shall be
limited to 20 m3/hr. ·
The top layer soils shall be sprayed with fine misting of water
immediately before the excavation. ·
Inactive excavated area shall be covered by impermeable sheeting to
minimise dust emissions. |
At CLS site / During
soil excavation |
Contractor |
|
|
3 |
|
-- |
|
S5.77-S5.79 |
Solidification ·
Temporary stockpiles shall be covered by impermeable sheets to
minimize wind erosion. ·
Handling and mixing of cement shall follow Air Pollution Control
(Construction Dust) Regulation to limit cement emission. ·
Mixing process at TKW shall be conducted in enclosed area. Biopiling ·
Emission characterisation study to identify exact concentration of
individual species of VOCs. ·
Biopiles
shall be at all times covered by impermeable sheeting to prevent wind
erosion. ·
TOC emission to the atmosphere shall be limited to 20mg/m3,
with maximum flow of no more than 56 m3/min, expressed at 298K, 1
atmosphere, dry and 11% oxygen content condition.. ·
Carbon absorber with 99% control efficiency shall be installed to
ensure TOC level of off-gas comply with the emission limit before discharged. Thermal desorption ·
Gaseous
fuel shall be used for thermal desorption ·
The thermal
desorption shall be of enclosed process. ·
The flue
stack shall be of at least 10m high. ·
The
following emission limits (expressed at 298K, 1 atmosphere, dry and 11% oxygen
content condition) from the
thermal desorption process shall be satisfied; -
0.1ng/m3 for dioxin; -
20mg/m3 for TOC; and -
exhaust gas flowrate of no more than 60m3/min. ·
The air
treatment unit associated with the thermal desorption facility shall allow no
more than 0.0001% of SVOC, PAHs and dioxins from the soils, escaped as
gaseous pollutants. ·
Approval
from authority is required for installation of chimney with gaseous
consumption rate more than 1150 MJ/hr |
At CLS and TKW site /
During soil treatment At TKW site / During
soil treatment At TKW site / During
soil treatment At TKW site / During
soil treatment |
Contractor Contractor Contractor Contractor |
|
|
|
3 3 3 3 |
Air Pollution Control (Construction Dust) Regulation – Air Pollution Control
(Furnaces, Ovens and Chimneys) (Installation and Alternation) Regulation |
# All recommendations and requirements resulted
during the course of EIA/EA Process, including ACE and / or accepted public
comment to the proposed project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment
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 |
|||
|
Des |
Slo/ Dem |
Exc |
Tre |
|||||
|
S7.70 – S7.73 S7.74 S7.75 S7.76 S7.77 |
Building Demolition, Slope
Improvement, Soil Remediation Plants Construction and Remediation Plant s
Decommissioning Surface Run-off Catchpits and perimeter
channels shall be constructed in advance of site formation works and
earthworks. Surface run-off from the construction sites shall be directed
into storm drains via adequately designed wastewater treatment facilities
such as sand traps, silt traps and sediment basins. Channels, earth bunds or sand bag barriers shall be
provided on site to properly direct stormwater to such facilities Silt removal
facilities, channels and manholes shall be maintained and the deposited silt
and grit shall be removed regularly, at the onset of and after each rainstorm
to ensure that these facilities are functioning properly at all times. Open stockpiles
of demolition materials on site shall be avoided or where unavoidable covered
with tarpaulin or similar fabric during rainstorms. Measures shall be taken to prevent the washing away of
construction materials, soil, silt or debris into any drainage system. Manholes
(including any newly constructed ones) shall 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 shall be cleaned before they leave the construction site to ensure that
no earth, mud or debris is deposited by them on roads. A wheel washing bay shall be provided
at every site exit, if practicable, and wash-water shall have sand and silt
settled out or removed before being discharged into the storm drains. In any case, discharge of wheel wash
water shall be minimised and recycled where possible. The section of construction road
between the wheel washing bay and the public road shall be paved with
backfill to reduce vehicle tracking of soil and to prevent surface run-off
from entering public road drains Wastewater from
Site Facilities Shall the use of
chemical toilets be necessary then these shall be provided by a licensed
contractor, who will be responsible for appropriate disposal and maintenance
of these. Storage and
Handling of Oil, Other Petroleum Products and Chemicals All fuel tanks
and chemical storage areas shall be provided with locks and be sited on
sealed areas. The storage areas
shall be surrounded by bunds with a capacity equal to 110% of the storage
capacity of the largest tank to prevent spilled oil, fuel and chemicals from
reaching the receiving waters.
The Contractors shall prepare guidelines and procedures for immediate
clean-up actions following any spillages of oil, fuel or chemicals. Wastewater
Treatment Facilities Sufficient wastewater treatment
facilities shall be provided to treat the surface runoff and wheel wash water
to the discharge standards as stipulated in the Technical Memorandum on Standards for Effluents Discharged into
Drainage and Sewerage Systems, Inland and Coastal Waters. In addition, discharge licence under
the Water Pollution Control Ordinance
shall be obtained for any discharge of treated runoff and wheel wash water to
the environment. |
1.
Building demolition at CLS 2.
Slope Improvement behind CLS 3.
Remediation Plant Construction at TKW 4.
Remediation plant decommissioning at TKW |
Contractor |
|
3 3 |
|
3 3 |
EIAO-TM, WPCO |
|
S7.79 – S7.81 |
Soil Remediation Excavation and Dewatering at CLS All exposed
pits shall be whenever possible backfilled immediately or covered and bunded.
Further, all excavated soil shall be loaded into dump truck directly to avoid
stockpiles of contaminated soil next to excavation pits Final
surfaces after excavation shall be well compacted and the subsequent
permanent work or surface protection shall be carried out as soon as
practical after the final surfaces are formed to prevent erosion caused by rainstorms. Appropriate intercepting channels and
partial shelters shall be provided where necessary to prevent rainwater from
collecting within the trenches or footing excavations. The contractor shall
develop contingency plans for capture and control of any runoff prior to
backfill during runoff-producing rainfall events. Groundwater
drawn from the dewatering process during excavation and rainwater collected
within the trenches or excavation pits shall be pumped out and recharged back
the ground in the vicinity. |
Soil excavation
at CLS |
Contractor |
|
|
3 |
|
-- |
|
S7.83 – S7.85 |
Operation of the
Solidification Facility The designated
stockpiling area before incepting contaminated soils shall be concrete-paved
or lined with impervious floor membrane and shall have its perimeter
constructed of a concrete bund in order to avoid any contaminated leachate
from migrating out of the area. The leachate shall be collected and treated
prior to disposal. Temporary
stockpiles upon formation shall be immediately covered with low permeability
cover to stop precipitation from washing the contaminated soil thus
generating contaminated runoff. The contractor shall formulate contingency
plans for the runoff collection and control. The
solidification facility shall be sheltered and area of soil unloading/
loading shall be provided with shed to avoid contaminated runoff. Excessive addition of water during
the process shall be avoided during the process. As an additional measure, any pits used for
solidification area shall be shallower than the water table to minimize the
leaching of the contaminated soils.
And a impermeable membrane/sheet shall be placed at the bottom of any
solidification pit during the solidification process |
Operation of the solidification facility at
CLS |
Contractor |
|
|
|
3 |
-- |
|
S7.86 |
Decontamination Water and
Wheel Wash Water During soil excavation, dump trucks or excavators
shall be decontaminated before they leave the site to ensure that no
contaminated earth, mud or debris is deposited by them on roads. A wheel washing bay shall be provided
at every site exit that equipped with an adequately sized centralised
wastewater treatment unit. The wastewater treatment unit shall deploy flocculation/
sedimentation and activated carbon filtering by which processes sands/ silts
with dioxin cohered are to be settled out and other soil contaminants in
wheel washes and decontamination water removed. The polluting parameters in effluent shall comply with TM
discharge standards and dioxin in effluent shall be cleared of to an
undetectable range before the effluent being discharged into the storm
drains. The installation and
operation of the wastewater treatment unit shall be licensed and subject to
the effluent monitoring as required under the Waste Disposal Ordinance. In any case, discharge of wheel wash
water shall be minimised and recycled where possible. The section of construction road
between the wheel washing bay and the public road shall be paved with
backfill to reduce vehicle tracking of soil and to prevent surface runoff
from entering public road drains. |
Soil excavation at CLS |
Contractor |
|
|
3 |
|
EIAO-TM, WDO |
|
S7.89- S7.90 |
Biopiling Impermeable
liner shall be placed at the bottom of the biopiles and leachate collection
sump shall be constructed along the perimeter of the biopiles to prevent
leachate from contaminating the underlying soil/groundwater. Concrete bund
shall be constructed along the perimeter of biopiles to prevent the runoff
coming out from the contaminated soil.
All leachate collected shall be treated in a centralised wastewater
treatment unit. The wastewater treatment unit shall deploy flocculation/
sedimentation and activated carbon filtering by which processes sands/ silts
with dioxin cohered are to be settled out and other soil contaminants in
wheel washes and decontamination water removed. The polluting parameters in effluent shall comply with TM
discharge standards and dioxin in effluent shall be cleared of to an undetectable
range before the effluent being discharged into the storm drains. The installation and operation of the
wastewater treatment unit shall be licensed and subject to the effluent
monitoring as required under the Waste
Disposal Ordinance Biopiles after
formation and during rain shall be covered by anchored impermeable
geotextiles to prevent contaminated runoff. The exposed biopile section at
any time shall not be more than 5m in length. |
Soil treatment at TKW |
Contractor |
|
|
|
3 |
EIAO-TM, WDO |
|
S7.91 |
Thermal Desorption The storage bin
for the dioxin-contaminated soils shall be sheltered and bottom lined to
prevent generation of contaminated runoff. The storage bin shall be equipped with leachate sump to
collect any leachate from the soil stack and subsequently the leachate will
be treated in the centralised wastewater treatment unit before
discharging. Concrete bund and
adequately sized sump shall be constructed at the perimeter of thermal
desorption plant to collect any runoff within the plant to cater occasionally
very heavy downpour during the remediation period. The runoff from the desorption plant of the first 30
minutes of a rainstorm is considered to be contaminated and shall be
collected and treated in the centralised wastewater treatment unit. The
wastewater treatment work shall contain sedimentation, filters, coagulation/
flocculation unit and activated carbon adsoption. The treatment plant will be
subject to the effluent monitoring requirement under the Waste Disposal Ordinance. . All non-aqueous
condensates from the thermal desorption processes shall be stored in
sealable, leak-proof containers for off-site disposal. The aqueous phase of
the condensate shall be used to quench the thermally-treated soil and
rehumidify it to reach a specified moisture content. Excessive aqueous product shall be
treated in the wastewater treatment unit before discharged. No direct
discharge of excessive aqueous product into the local drains or drainage
channel shall be allowed. |
Soil treatment at TKW |
Contractor |
|
|
|
3 |
EIAO-TM, WDO |
|
S7.92 – S7.93 |
Solidification The
solidification facility shall be sheltered and area of soil unloading/
loading shall be provided with shed to avoid contaminated runoff. Excessive addition of water during
the process shall be avoided during the process. As an additional
measure, Any pit used for solidification area shall be shallower than the
water table to minimize the leaching of the contaminated soils. And a impermeable membrane/sheet
shall be placed at the bottom of any solidification pit during the solidification
process.. |
Soil treatment at TKW |
Contractor |
|
|
|
3 |
EIAO-TM |
# All recommendations and requirements resulted during the course of
EIA/EA Process, including ACE and / or accepted public comment to the proposed
project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment
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 |
|||
|
Des |
Slo/ Dem |
Exc |
Tre |
|||||
|
S6.76 |
Good Site
Practice and Waste Reduction Measures · Recommendations for good site practice during the decommissioning and demolition activities: - Use waste haulier authorised or licensed to collect specific category of waste; - Obtain the necessary registration and licences under the Waste Disposal Ordinance and the Waste Disposal (Chemical Waste) (General) Regulation from the Environmental Protection Department; - Nomination of an approved person, such as a site manager, to be responsible for good site practice, 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; - separation of chemical wastes for special handling and appropriate treatment at a licensed facility; - regular cleaning and maintenance programme for drainage systems, sumps and oil interceptors; - a recording system for the amount of wastes generated, recycled and disposed of (including the disposal sites); - In order to monitor the disposal of C&D material and solid wastes at public filling facilities and landfills, and control fly-tipping, a trip-ticket system shall be included as one of the contractual requirements and implemented by the Environmental Team. One may make reference to WBTC No. 5/99 for details; and - A Waste Management Plan (WMP) shall be prepared and this WMP shall be submitted to the Engineer for approval. One may make reference to WBTC No. 29/2000 for details. |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
Waste Disposal Ordinance
(Cap. 54) |
|
S6.77 |
· The following measures shall be implemented where applicable: - 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, paper waste and plastic bottles by individual collectors, separate labelled bins shall be provided to segregate this 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 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 the amount of waste generated and avoid unnecessary generation of waste. |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
Waste Disposal Ordinance
(Cap. 54) |
|
S6.79 |
Waste Recycling · To minimise the amount of waste disposal to landfill, the general refuse (not contaminated) shall be reused and recycled as much as practical. Waste sorting and segregation shall be carried out in accordance with the following categories for recycling: - Plastic (i.e. plastic bag, plastic bottle, plastic packaging, etc.) - Rubber; - Paper; - Wood/ timber; - Glass; - Textile; and - Metal (i.e. aluminium can, steel metal, ferrous metal, and non-ferrous metal). |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
- |
|
S6.37 – S6.38, S6.81 – S6.85 |
Chemical Waste ·
The Contractor shall register with EPD as chemical waste producer. ·
To maximise
the opportunity for recycling/ reuse, during the decommissioning stage,
recoverable chemical wastes (in particular oil, paint and solvent) shall be
separated from the rest and collected by licensed collector for recovery at
licensed plant. ·
The chemical waste, including asbestos wastes, shall be separated from
non-chemical waste. Workers
involved in the handling of chemical waste shall be suitably trained and
shall wear appropriate protective masks and clothing when handling such
materials. Chemical wastes shall
be handled according to the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes. Spent chemicals shall be stored and
collected by an approved operator for disposal at a licensed facility in
accordance with the Chemical Waste (General)
Regulation. ·
Containers
used for storage of chemical waste shall: - Be suitable for the substance they are holding, resistant to corrosion, maintained in good condition, and securely closed. - Have a capacity of less than 450 litres unless the specifications have been approved by the EPD. - Display a label in English and Chinese in accordance with instructions prescribed in Schedule 2 of the Regulations. ·
The storage
area for chemical waste shall: - Be clearly labelled and used solely for the storage of chemical waste. - Be enclosed on at least 3 sides. - Have an impermeable floor and bunding, of capacity to accommodate 100% of the volume of the largest container or 20% by volume of the chemical waste stored in that area, whichever is the greatest. - Have adequate ventilation. - Be covered to prevent rainfall entering (water collected within the bund must be tested and disposal as chemical waste if necessary). - Be arranged so that incompatible materials are adequately separated. ·
Disposal of
chemical waste shall: - Be via a licensed waste collector. - Be at a facility licensed to receive chemical waste, such as CWTC which offers a chemical waste collection service and can supply the necessary storage containers. - Be a recycler of the waste, with waste disposal licence from the EPD. |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
Waste Disposal Ordinance and
Waste Disposal (Chemical Waste) (General) Regulation. |
|
S6.86 |
C&D Material ·
The
Contractor shall separate the C&D material including steel, timber and
scrap metals from other wastes, as far as practical, and shall arrange for
recycling and reuse on site to the extent possible. All C&D materials arising from demolition work shall
be sorted on-site and be separated into different groups for disposal at
landfills, PFAs, or recycling as appropriate in accordance with WBTC No. 5/98. Due to limited space at landfills,
disposal at reclamation sites or PFAs would be the preferred option. A trip-ticket system for disposal of
C&D material as detailed in WBTC
No. 5/99 shall be followed.
Finally, a method statement for the sorting, processing and disposal
of C&D materials arising from demolition work shall be submitted by the
Contractor to the Engineer for his approval. |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
Waste Disposal Ordinance
(Cap. 354); New Disposal Arrangements For Construction Waste (1992); WBTC No.
5/98, On Site Sorting Of Construction Waste On Demolition Sites. |
|
S6.87 – S6.89 |
Contaminated
Residues ·
Building
sampling shall be carried out prior to demolition to characterise the
contaminants present on the building surfaces and identify suitable reagents
for decontamination. After
contaminants characterisation, a Decommissioning Plan shall be prepared by
the specialist Contractor recommending the indoor remediation protocols as
well as the demolition method
for the Engineer’s approval.
Scabbling is the preferred method of cleaning. ·
Adequate
on-site supervision by competent personnel is required. ·
After completion of building decontamination, the material can be
discarded as normal C&D waste.
The chemical deposits or residues from scabbling will be disposed of
to CWTC. |
At CLS site / During
building demolition |
Contractor |
|
3 |
|
|
Waste Disposal Ordinance
(Cap. 354) |
|
S6.90 – S6.91 |
General Refuse · General refuse shall be stored in enclosed bins or compaction units separated from C&D material and chemical wastes. No open stockpile of general refuse is allowed on site to minimise environmental impacts. A reputable waste collector shall be employed by the contractor to remove general refuse from the site, separately from C&D material and chemical wastes, on a daily or every second day basis to minimise odour, pest and litter impacts. · Aluminium cans, paper waste and plastic bottles are often recovered from the waste stream by individual collectors if they are segregated or easily accessible, so separate labelled bins for their deposit shall be provided if feasible. Site office waste can be reduced through recycling of paper if volumes are large enough to warrant collection. Participation in a local collection scheme shall be considered if one is available. |
CLS, slope behind CLS and
TKW / During building demolition, slope improvement, soil excavation and soil
treatment |
Contractor |
|
3 |
3 |
3 |
Waste Disposal Ordinance
(Cap. 354); New Disposal Arrangements For Construction Waste (1992); WBTC No.
5/98, On Site Sorting Of Construction Waste On Demolition Sites. |
|
S6.92 – S6.93 |
Slope Works
behind CLS · The excavated soil and rock shall be disposed of to PFAs. In addition, a Waste Management Plan shall be prepared by the Contractor in order to keep waste arising to a minimum and to ensure that waste is handled, transported and disposed of in a suitable manner. · The design of slope work shall be planned carefully to maximise the preservation of existing profiles with stabilisation as necessary to minimise cutting. |
At slope behind CLS/ during slope improvement |
Contractor |
|
3 |
|
|
- |
|
S6.94 |
Land Formation ·
The C&D material generated from
this Project shall be reused/ recycled as far as practicable in the land
formation works within CLS site so as to minimise the amount of C&D
material to be disposed of at PFAs.
|
CLS, slope behind CLS and
TKW / During building demolition, slope improvement |
Contractor |
|
3 |
|
|
- |
|
S6.95 – S6.96 |
Soil Excavation
at CLS · The buried chemical wastes shall be handled in compliance with the provisions of Chemical Waste Regulations. The site contractors, workers and operatives shall also be required to follow appropriate procedures on handling chemical wastes according to the Code of Practice on the Packaging, Labelling and Storage of Chemical Wastes and with the Code of Practice on the Handling, Transportation and Disposal of Asbestos Waste for asbestos wastes. |
At CLS site / During soil
excavation |
Contractor |
|
|
3 |
|
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354); Code of Practice on the Packaging,
Labelling and Storage of Chemical Wastes, Code of Practice on the Handling,
Transportation and Disposal of Asbestos Waste |
|
S6.98 |
Collection and
Transportation of Wastes ·
Dump trucks
will be extensively used for the transit of waste, other than material
contaminated with dioxin which will be transported by roll-off trucks between
the excavation area and TKW. The
following precautionary measures shall be taken to avoid spillage, wind
erosion and incident in transit. - Transportation of contaminated soil shall be escorted to improve road safety; - The haul road shall be properly illuminated if there are any night works. - Strict speed limit (50km/hr.) shall be imposed on the whole length of the haul road; - Never overload the dump truck to prevent spillage of contaminated soil; -
Dioxin-contaminated material shall be transported in roll-off trucks
with sealable top; -
Always cover the payload on each dump truck with strong and
impermeable sheeting to withstand wind and rain while the truck is
travelling; -
Adequately but not excessively wet the payload to check the dust
generation. |
From CLS to TKW site / During soil excavation and soil treatment |
Contractor |
|
|
3 |
3 |
- |
|
S6.99 – S6.101 |
· As dioxin-contaminated soil is classified as chemical waste, the trucks shall be labelled, handled and transported in accordance with the Waste Disposal Ordinance and the Waste Disposal (Chemical Waste) (General) Regulation. In addition, Chemical Waste Collection Licence under S.21 of the Waste Disposal Ordinance shall be obtained for the collection and transportation of such chemical waste. When the trucks approach the TKW Site, they will approach from west well clear of the east side of the site thereby avoid disturbance to the area where the group of egrets was sighted. ·
Dioxin
condensate (oily residue) generated from the thermal desorption plant shall
be transported in heavy duty and sealable drums, which will then be collected
by CWTC’s own fleets which are designed and licensed for the collection of
hazardous and chemical wastes. ·
A
contingency plan shall be prepared by the Contractor to spell out the
necessary procedures to be taken and in case of accident and/ or emergency
when transporting the contaminated soil to off-site location(s). All responsible parties and/ or
persons and their contact numbers shall be listed in the plan. |
From CLS to TKW site / During soil excavation and soil treatment |
Contractor |
|
|
3 |
3 |
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354) |
|
S6.103 – S6.106 |
Material Handling
and Transportation ·
The general
contaminated material in the trucks shall be covered with impermeable
sheeting (i.e. HDPE) to prevent ingress of rainwater during transportation.
Movements by sea of material contaminated with heavy metals, PAH and TPH could
use self-propelled barges. ·
For
material contaminated with dioxin, roll-off trucks (with sealable top) are
recommended to minimise the risk of material loss during material handling
and transportation, particularly in the event of an incident. Direct loading
of material into containers at the point of excavation is recommended to
minimise double handling and any associated losses. |
From CLS to TKW site / During soil excavation and soil treatment |
Contractor |
|
|
3 |
3 |
- |
|
S6.107 – S6. 116 |
Storage ·
The stockpile
shall be formed on a paved area.
To reduce air quality impact, the storage area shall be roofed. The roof structure shall be in place
prior to the deposition, storage or removal of material from the storage
building. ·
For the
bulk storage of general contaminated material for solidification only, a
stockpile is proposed for storage up to an overall height of 5 metres over a
net storage area of 1.0ha. Material stored to the design height shall be
covered using a impermeable sheeting.
|
At TKW site/ During soil
treatment |
Contractor |
|
|
|
3 |
- |
|
S6.117 |
Treatment Area ·
The
containment structure and concrete floor at the treatment site shall be
decontaminated after completion of remediation. It is recommended that these structures be decontaminated
by scabbling and then be discarded as normal C&D material. The chemical deposits or residues
from scabbling will be disposed of at CWTC for ultimate disposal. |
At TKW site / During soil
treatment |
Contractor |
|
|
|
3 |
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354) |
|
S6.118 – S6.119 |
Off-Site
Decontamination Works ·
All soils after treatment will turn to clean inert materials suitable
for public filling. The
condensate as the end product of the thermal desorption process and other
chemical wastes (e.g. spent activated carbons & filters) generated shall
be temporarily stored in a secure hut.
Such waste will be collected by licensed collectors and disposed of at
the CWTC to avoid bulk storage at treatment site. Pending collection, the chemical waste shall be packaged
and where necessary stored temporarily on-site in accordance with the Waste Disposal (Chemical Waste) (General)
Regulation. ·
Prior
arrangement with CWTC shall be made to avoid compromising the daily operation
of CWTC. |
At TKW site / During soil treatment |
Contractor |
|
|
|
3 |
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354) |
|
S6.120 |
Off-Site
Decontamination Works ·
A batch of the oily condensate will
be sent to CWTC for a performance test and treatment shall begin only after
performance tests have been passed. ·
Treatment of condensate shall be in
batches with a campaign every
week or every two weeks. |
At TKW site / During soil
treatment |
Contractor |
|
|
|
3 |
- |
|
S6.121 |
Precautionary Measures during Wet and
Typhoon Seasons ·
Surface runoff from the treatment site shall be
directed into storm drains via adequately designed sand/ silt removal
facilities such as sand traps, silt traps and sediment basins. Channels, earth bunds or sand bag
barriers shall be provided on site to properly direct stormwater to such site
removal facilities. ·
Catch-pits and perimeter channels shall be
constructed in advance of site preparation works. ·
Open stockpiles on site shall be covered with
tarpaulin during rainstorms.
Measures shall be taken to prevent the washing away of soil into any
drainage system. ·
The storage area for excavated soil from CLS shall
be roofed and covered. In
addition, run-on/ run-off control elements shall be constructed. Finally, the floor shall be concrete
paved. ·
A dedicated wastewater treatment unit shall be
constructed for the treatment of contaminated run-off, leachate collected and
decontamination water |
At TKW site / During soil
treatment |
Contractor |
|
|
|
3 |
- |
|
S6.122 – 6.125 |
Equipment Decontamination Requirement ·
For
excavation and transport equipment at the CLS or treatment site, if it stays
within the contaminated zone, such as excavation and stockpiling areas, it
shall be decontaminated (typically steam cleaning) prior to leaving the
contaminated zone. The
contaminated zone shall need to be clearly defined with fencing. The exit of the contaminated zone
shall have a decontamination pad for cleaning of the equipment before it
leaves the zone. The decontamination
water shall be collected and disposed of at the on-site wastewater treatment
unit. Care shall be exercised by
the Contractor to prevent contamination of areas outside the contaminated
zone. ·
In
treatment area, particularly for a large-scale ongoing operation, separate
equipment shall be employed for transport of treated materials to prevent any
potential for recontamination. A
“contaminated” loader shall load only the contaminated soils into the
decontamination system, and a “clean” loader shall be assigned to remove the
treated soils from the stockpile at the outlets of the decontamination
systems. ·
Lining of
trucks with plastic is recommended to prevent spills and leakage during
transport. Besides, draping of
plastic over the sides of trucks can minimise the amount of soil accumulates
on the outside of the body. For
transport within the contaminated zone, the cover fabrics/ plastic sheeting
can be reused depending on the truck and cover configuration, otherwise they
shall be dumped into landfill. ·
No water
discharge is allowed prior to on-site treatment. |
From CLS to TKW site / During soil excavation and soil treatment |
Contractor |
|
|
3 |
3 |
Waste Disposal (Chemical
Waste) (General) Regulation (Cap 354) |
# All recommendations and
requirements resulted during the course of EIA/EA Process, including ACE and /
or accepted public comment to the proposed project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment
Table 13.5 Implementation Schedule for Ecological Impact
|
EIA Ref # |
Environmental Protection Measures / Mitigation
Measures |
Location /
Timing |
Implementation
Agent |
Implementation
Stages* |
Relevant
Legislation and Guidelines |
|||
|
Des |
Slo/ Dem |
Exc |
Tre |
|||||
|
S8.78-S8.94
S8.135-S8.139 |
Impacts to restricted / protected plant species ·
Where possible, restricted/protected plant species
are to be preserved in situ. Areas
supporting the highest concentrations of restricted or protected species have
been fenced off to prevent tipping, vehicle movement and encroachment of
personnel into these areas. ·
Plants directly affected by the proposed works will
be transplanted to suitable receptor sites that have been identified at Tai
Tam Country Park. To maximize the transplantation success, seeds will be
collected prior to transplantation and kept in specialist storage facilities. In case the transplantation is
unsuccessful, the stored seeds will be germinated and cultivated, and
reintroduced to the receptor sites. A 3-year post-transplantation monitoring
will be undertaken to ensure successful establishment of the plants
concerned. |
Behind CLS and near MTHS / During building
demolition, slope improvement and soil excavation |
Contractor |
|
3 |
3 |
|
Forests and Countryside Ordinance (cap. 96) Animals and Plants (Protection of Endangered
Species) Ordinance (Cap. 187) Country Parks Ordinance (Cap. 208) |
|
S8.95-S8.115. |
Impacts to MTHS and Rice Fish population ·
The lower course of MTHS will be affected by the
proposed works at Cheoy Lee.
Mitigation measures will focus on re-creating a suitable habitat of
the Rice Fish further upstream of MTHS, where impacts arising from
construction works to the re-created habitat is minimal. More detailed surveys of the Rice
Fish will be carried out prior to the commencement of fill works. ·
If Rice Fish are found in future surveys, they shall
be temporarily relocated to holding aquaria. A recreated habitat suitable for
the fish shall then be constructed at MTHS, and the fish returned to the
habitat. Maintenance of the
holding facilities and care for the captive fish will be undertaken prior to
relocation to the re-created habitat. ·
If no Rice Fish are found in future surveys, it may
be possible to source a captive population, and re-introduce the fish to a
re-created habitat at MTHS. Post
relocation monitoring of the Rice Fish in the re-created habitat will be undertaken. ·
Incorporation of environmentally friendly design of
the future drainage channel to encourage recolonisation of the lower stream
fauna. |
At MTHS / During building demolition, and soil
excavation |
Contractor |
|
3 |
3 |
|
- |
|
S8.118 |
The following measures will be
implemented to reduce disturbance to the coastal area of TKW in view of the
previous incidental sighting of a small population of ardeids: -
The
construction of biopiles (where high levels of activity may disturb the
birds) shall take place from October-February, outside of the Ardeid breeding
season; -
Thermal
Desorbers shall be placed at the west of the site, as far from potential
nesting sites as possible |
At TKW site / During soil treatment |
Contractor |
|
|
|
3 |
- |
|
S8.117 |
Other Mitigation Measures ·
All potentially harmful contaminants from CLS shall
be handled, treated and disposed of in an appropriate manner; to minimise
risks to human health and flora and fauna. |
At CLS site / During decommissioning |
Contractor |
|
|
3 |
3 |
- |
|
S8.119-S8.121 |
Fill / Slope works ·
Shotcrete shall not be used for the slope works. The
design of slope works shall make reference to the GEO Publication No. 1/2000
“Technical Guidelines on Landscape Treatment and Bioengineering for Man-made
Slopes and Retaining Walls”. ·
Works on slopes supporting natural vegetation shall
be minimised as far as slope safety standards allow. ·
Hydroseeding and planting of trees and shrubs
including native species will be undertaken on newly created slopes. |
At slope
behind CLS / During slope improvement |
Contractor |
|
3 |
|
|
Technical Guidelines on Landscape Treatment and
Bioengineering for Man-made Slopes and Retaining Walls. |
|
S8.122-S8.130 |
General Mitigation Measures ·
Before commencement of works, staff shall be
informed by the Site Engineer of the conservation significance of
restricted/protected plant species directly impacted by the development. ·
Placement of equipment or stockpile in the work
areas and access routes shall be selected on existing disturbed land to
minimise disturbance to natural habitats. ·
Construction activities shall be restricted to the
work areas that shall be clearly demarcated. ·
The work areas shall be reinstated immediately after
completion of the works. ·
Waste skips shall be provided to collect general
refuse and construction wastes. The wastes shall be disposed of timely and
properly off-site. ·
Drainage arrangements shall include sediment traps
to collect and control construction run-off. ·
Open burning shall be strictly prohibited. |
All works sites / During all work phases |
Contractor |
|
3 |
3 |
3 |
- |
# All recommendations and requirements resulted
during the course of EIA/EA Process, including ACE and / or accepted public
comment to the proposed project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment
Table 13.6 Implementation Schedule for Cultural Heritage Impact
|
EIA Ref # |
Environmental Protection
Measures / Mitigation Measures |
Location / Timing |
Implementation Agent |
Implementation Stages* |
Relevant Legislation and
Guidelines |
|||
|
Des |
Slo/ Dem |
Exc |
Tre |
|||||
|
S9.23 – S9.28 |
·
Impermeable
sheeting shall be used to cover the archaeological potential site for areas
where are not subject to rescue excavation. ·
Detailed
design of filling work or ground level adjustment work shall consider
diversion of site runoff to prevent any waterlogged conditions. |
At CLS site / during design and building demolition |
CED, Contractor |
3 |
3 |
|
|
- |
|
S9.23-S9.28 |
The impacted
area shall be mitigated by rescue excavation prior to decontamination works. The rescue excavation team shall adopt
the following procedures to ensure the safe and healthful work environment. ·
Smoking, open flames and the carrying of matches and lighters is not
allowed in the rescue areas; ·
Personal protective clothing shall be worn by the team members at all
time; ·
Respirator and gloves for vapour exposure protection shall be worn
during excavation; ·
Impermeable liners shall be placed at the bottom of the stockpile to
prevent leachate from contaminating the underlying soil/groundwater; ·
Inactive excavated area shall be covered with low permeable sheet; ·
Any material shall be backfilled on site after completion of the
rescue works; ·
Temporary stockpiles beside excavation areas shall be covered by
impermeable sheet to prevent dust emission and contaminated runoff. |
At CLS site / During building
demolition |
AMO |
|
3 |
|
|
- |
|
S9.23 |
·
On-site
monitoring |
At CLS/ During building demolition
and soil excavation |
AMO |
|
3 |
3 |
|
|
# All recommendations and requirements resulted
during the course of EIA/EA Process, including ACE and / or accepted public
comment to the proposed project.
* Des - Design, Slo/Dem – Slope Improvement and Building Demolition, Exc
– Soil Excavation, and Tre – Soil Treatment