6.1
This
section identifies the types of waste that are likely to be generated during
construction and operation phases of the Project, and evaluates the potential environmental
impacts that may result from these wastes.
Mitigation measures and good site practices, including waste handling,
storage and disposal, are recommended with reference to the applicable waste
legislation and guidelines.
Environmental
Legislation, Policies, Plans, Standards and Criteria
6.2
The
criteria and guidelines for assessing waste management implications are
outlined in Annex 7 and Annex 15 of the Technical Memorandum on Environmental
Impact Assessment Process (EIAO-TM), respectively.
6.3
The
following legislations also cover the handling, treatment and disposal of waste
in
·
Waste
Disposal Ordinance (Cap. 354) and subsidiary Regulations;
·
Land
(Miscellaneous Provisions) Ordinance (Cap. 28);
·
Public
Health and Municipal Services Ordinance (Cap. 132);
·
Waste
Disposal (Chemical Waste) (General) Regulation; and
·
Waste
Disposal (Charges for Disposal of Construction Waste) Regulation.
Waste
Disposal Ordinance (Cap. 354)
6.4
The
Waste Disposal Ordinance (WDO) prohibits any unauthorized disposal of waste. Construction waste, defined under Cap.
354N of the WDO refers to a substance, matter or thing which is generated from
construction works. It includes all
abandoned materials, whether processed or stockpiled or not, before being
abandoned, but does not include sludge, screenings or matter removed or
generated from desludging, desilting or dredging works. Under WDO, waste can be disposed of only
at designated waste disposal facilities licensed by the Environmental
Protection Department (EPD).
Public
Health and Municipal Services Ordinance (Cap. 132)
6.5
The
Public Cleansing and Prevention of Nuisances Regulation provides control on
illegal tipping of waste on unauthorized (unlicensed) sites.
Land
(Miscellaneous Provisions) Ordinance (Cap 28)
6.6
The
inert portion of Construction and Demolition (C&D) materials (including
rocks, soil, broken concrete, building debris, etc.) may be taken to public
fill reception facilities. Public
fill reception facilities (PFRFs) usually form part of land reclamation schemes
and are operated by the Civil Engineering and Development Department (CEDD) and
others. The Land (Miscellaneous
Provisions) Ordinance requires that individuals or companies who deliver public
fill to the public fill reception facilities to obtain Dumping Licences. The licences are issued by CEDD under
delegated authority from the Director of Lands.
6.7
Individual
licences and windscreen stickers are issued for each vehicle involved. Under the licence conditions, public
fill reception facilities will only accept soil, sand, rubble, brick, tile,
rock, boulder, concrete, asphalt, masonry or used bentonite. In addition, in accordance with
paragraph 11 of the Environment, Transport and Works Bureau (ETWB) Technical
Circular (Works) (TC(W)) No. 31/2004, Public Fill Committee will advise on
the acceptance criteria. The
material will, however, be free from marine mud, household refuse, plastic,
metal, industrial and chemical wastes, animal and vegetable matter and any
other materials considered unsuitable by the public fill reception facility
supervisor.
6.8
Other
guidelines which detail how the Contractor should comply with are as follow:
·
A
Guide to the Registration of Chemical Waste Producers, Environmental Protection
Department,
·
A
Guide to the Chemical Waste Control Scheme, Environmental Protection
Department,
·
Code
of Practice on Package, Labelling and Storage of Chemical Wastes (1992),
Environmental Protection Department,
·
Works
Branch Technical Circular (WBTC) No. 2/93, Public Dumps;
·
Works
Branch Technical Circular No. 2/93B, Public Filling Facilities;
·
ETWB
TC(W) No. 33/2002, Management of Construction/Demolition Materials including
Rocks;
·
ETWB
TC(W) No. 31/2004, Trip-ticket System for Disposal of Construction and
Demolition Materials; and
·
ETWB
TC(W) No. 19/2005, Environmental Management on Construction Sites.
Assessment
Approach and Methodology
6.9
Criteria
for assessing waste management implications are outlined in Annex 7 of
EIAO-TM. Whereas methods for
assessing potential waste management impacts during construction and operation
phases of the Project would be examined in accordance with Annex 15 of EIAO-TM,
which includes the following:
·
Estimation
of types and quantities of the wastes generated;
·
Assessment
of potential impacts from the management of waste with respect to potential
hazards, air and odour emissions, noise, wastewater discharge and public
transport; and
·
Impacts
on the capacity of waste collection, transfer and disposal facilities.
6.10
Opportunities
for waste reduction have been assessed based upon the following:
·
Avoidance
and minimization of waste generation throughout design, construction and
operation stage;
·
Segregation
of waste materials would be promoted and considered as the best management
practices;
·
Reuse
and recycling on site or on other projects; and
·
Material
diversion to public fills as far as possible.
Identification of
Environmental Impacts
6.11
Construction
activities to be carried out for this proposed Project could generate a variety
type of wastes that can be divided into distinct categories based on their
composition and ultimate method of disposal. The identified waste types are:
·
Excavated
materials;
·
Construction
and demolition (C&D) materials;
·
Chemical
waste; and
·
General
refuse.
Operation
Phase
6.12
Major
type of wastes to be generated during the operation phase of OWTF would
include:
·
Wastes
generated from pre-treatment process;
·
Chemical
waste; and
·
General
refuse.
6.13
Waste
to be generated from construction and operation phases could both cause impacts
and nuisances to the environment if handling and disposal methods are not
properly managed. Potential impacts
and proposed mitigation measures will be discussed in the following sections.
Evaluation of
Environmental Impacts during Construction Phase
Excavated
Materials
6.14
During
the construction phase, excavated materials will be generated from site
formation, foundation works and the possible construction of access roads. It is estimated that approximately 7,000
m3 of materials will be excavated, while 1,300 m3 of the
excavated materials could be reused on site.
6.15
Excavated
materials should be reused on site for filling works, for instance site
formation, backfilling and access road construction, as far as possible to
minimise the net amount of such materials generated from the Project. With careful planning for reusing
excavated materials on site, secondary environmental impacts and potential
impacts on waste handling is expected to be minimal.
6.16
The
quantities of excavated materials to be reused, delivered to public fill and
disposed of at landfill have been estimated in Table
6.1 below.
Table 6.1 Estimated
Amount of Excavated Materials to be Generated, Reused and Disposed of
|
|
Estimated
Amount of Excavated Materials to be Generated (m3) |
|
Excavated Materials |
7,000 |
|
Reuse on Site |
1,300 |
|
Deliver to Public Fills |
5,100 |
|
Dispose of at Landfills |
600 |
6.17
The
Project Proponent should obtain an advance agreement from the Public Fill Committee
to ensure the availability and capacity of public fill facility for disposal of
the anticipated amount of excavated materials.
6.18
Provided
that waste management practices as detailed in Sections 6.44 to 6.46
and Table
6.5 are properly implemented, the secondary
environmental impacts arising from on-site handling of excavated materials
would be minimal.
Construction
and Demolition (C&D) Materials
6.19
C&D
materials can be divided into two categories, namely inert materials and
non-inert materials. Inert
materials, such as rock and concrete, should be reused as much as possible. Whereas non-inert materials, including
timber, glass, steel and plastics are not suitable for land reclamation. Subject to the recovery / recycling rate
of non-inert materials, the rest of the materials should be disposed of at the
landfills.
6.20
The
following C&D materials are expected to be generated during the
construction phase of OWTF:
·
Timber
from formwork and falsework;
·
Materials
and equipment wrappings;
·
Unusable
/ surplus concrete or grouting mixes
6.21
Approximately
1,100 m3 of C&D materials would be generated from the
Project. A more detailed account of
C&D material generation should be provided in the Environmental Management
Plan (EMP) to be prepared by the Contractor.
6.22
The
quantities of C&D materials to be delivered to public fill and disposed of
at landfills have been estimated as shown in Table
6.2.
Table 6.2 Estimated
Amount of C&D Materials to be Generated, Reused and Disposed of
|
|
Estimated
Amount of C&D Materials to be Generated (m3) |
|
C&D Materials |
1,100 |
|
Reuse on Site |
0 |
|
Deliver to Public Fills |
900 |
|
Dispose of at Landfills |
200 |
6.23
The
project proponent should obtain an advance agreement from the Public Fill Committee
to ensure the availability and capacity of public fill facility for disposal of
the anticipated amount of C&D materials.
6.24
Provided
that waste management practices as detailed in Sections 6.44 to 6.46 and
Table
6.5 are properly implemented, the secondary
environmental impacts arising from on-site handling of the C&D materials
would be minimal.
Chemical Waste
6.25
During
construction phase, construction plant and equipment will require regular
maintenance and servicing that will generate chemical waste such as cleaning
fluids, solvents and lubrication oil.
Such chemical waste would likely pose serious environmental and health
and safety hazards if it is not properly managed in accordance with the Waste
Disposal (Chemical Waste) (General) Regulation and the Code of Practice on
Packaging, Labelling and Storage of Chemical Waste. These hazards may include:
·
Toxic
effects to workers;
·
Adverse
effects on water quality from spill; and
·
Fire
hazards.
6.26
Should
any chemical waste be generated, the Contractor must register with EPD as a
chemical waste producer. These
types of waste will be readily accepted for disposal of at the Chemical Waste
Treatment Centre (CWTC) in Tsing Yi.
A detailed account of chemical waste generation should be provided by
the Contractor during preparation of the WMP.
6.27
The
potential environmental impacts associated with the storage, handling and
disposal of the chemical waste will be minimal provided that relevant
mitigation measures in Section 6.47 and
Table
6.5 are implemented.
General Refuse
6.28
Throughout
construction phase, the workforce would generate refuse comprising food scraps,
waste paper, empty containers, etc.
Release of general refuse into coastal waters should not be permitted,
as the introduction of these wastes will likely have detrimental effects on
water quality in the area. Rapid
and effective collection of site wastes would be required to prevent waste
materials being blown around by wind, flushes into the coastal waters or
stream, or causing visual impacts.
The work site may also attract pests and vermin and create odour
nuisance if the waste storage area is not well maintained and cleaned
regularly. Disposal of refuse at
sites other than approved waste transfer or disposal facilities can also result
in similar impacts. With the
implementation of good waste management practices at the site, adverse
environmental impacts would not be expected to arise from the storage, handling
and transportation of workforce wastes.
The number of construction workers to be employed is estimated to be about
60 workers. Based on a generation
rate of 0.65 kg per worker per day and the recycling rate of 45% (the rate of
recycling in Hong Kong in 2007), the maximum daily arising and recycling of
general refuse during the construction phase would be approximately 39 kg and
18 kg respectively.
6.29
Potential
environmental impacts will be insignificant provided that the mitigation
measures and appropriate site practices suggested in Section 6.48 and Table 6.5 are implemented.
6.30
Table
6.3 provides a summary of the waste types that are likely to be generated from
construction phase of the Project, together with the recommended disposal
methods.
Table 6.3 Summary
of Waste Generation during Construction Phase
|
Waste Type |
Source of Generation |
Total Amount Generated |
Amount to be Disposed of |
|
Excavated materials |
Site formation and foundation works |
7,000m3 |
5,700m3 |
|
C&D materials |
Building and road construction works |
1,100m3 |
1,100m3 |
|
Chemical waste |
Maintenance of construction plant and equipment (cleaning fluids,
solvents and lubrication oil) |
Insignificant |
Insignificant |
|
General refuse |
Construction Workforce (food scraps, waste paper, empty containers,
etc.) |
39 kg/day |
21 kg/day |
Evaluation of
Waste Impacts for Operational Phase
Wastes
Generated from Pre-Treatment Process
6.31
Even
though source-separated organic wastes are collected for treatment in OWTF, a
contamination rate of no more than 10% could still occur in the waste
stream. In order to minimise the
contamination rate and to maximise the process efficiency, waste sorting should
be carried out on site to separate contaminants / non-organics from the
feedstock before putting through the biological treatment processes. Therefore, with a daily throughput of
approximately 200 tonnes, the amount of wastes to be generated from
pre-treatment process should be around 20 tonnes per day (tpd).
6.32
The
release of wastes generated from pre-treatment process into coastal waters
should be prohibited. Rapid and
effective collection of such wastes would be required to prevent waste
materials being blown around by wind, flushes into the coastal waters or
stream, or causing visual impacts.
With food waste being a major component of organic wastes, if the
reception and the storage of pre-treated material area are not well maintained
and cleaned regularly, the work site may be especially attractive to pests and
vermin, while as well creating odour nuisance. Disposal of such waste at sites other
than approved waste transfer or disposal facilities can result in similar
impacts. The implementation of good
waste management practices on-site could minimise adverse environmental impacts
arised from the storage, handling and transportation of wastes generated from
pre-treatment process.
6.33
Provided
that waste management practices as detailed in Section 6.52 and Table 6.6 are properly implemented, the secondary
environmental impacts arising from on-site handling of wastes generated from
pre-treatment process would be minimal.
Chemical
Waste
6.34
An
insignificant amount of chemical waste in the form of cleaning fluids, solvents
and lubrication oil would be generated during regular maintenance and servicing
of on-site mechanical equipment.
6.35
Chemical
waste could pose serious environmental, health and safety hazards if not
properly managed in accordance with the Waste Disposal (Chemical Waste)
(General) Regulation and the Code of Practice on Packaging, Labelling and
Storage of Chemical Wastes.
6.36
Should
any chemical waste be generated, the Operator must register with EPD as a
chemical waste producer. The
chemical wastes will be readily accepted for disposal of at the CWTC in Tsing
Yi. These chemical wastes should be
collected in drum-type containers by licensed chemical waste collector
periodically. With proper storage,
handling and disposal of small amount chemical waste, adverse environmental
impacts are not anticipated.
6.37
The
potential environmental impacts associated with the storage, handling and
disposal of the chemical waste will be insignificant provided that relevant
mitigation measures in Sections 6.53 to 6.56 and Table 6.6 are implemented.
General
Refuse
6.38
Quantity
of general refuse generated by visitors and on-site staff during daily operation
of OWTF will not be substantial provided that proper WMP is implemented.
6.39
Potential
environmental impacts arising from the handling and disposal of the general
refuse will be negligible and will not cause major environmental concerns
provided that the mitigation measures and appropriate site practices suggested
in Sections 6.57 to 6.58 and Table
6.6 are implemented.
6.40
Table
6.4 provides a summary of the waste types that are likely to be generated
during operation phase of the Project, together with the recommended disposal
methods.
Table 6.4 Summary
of Waste Generation during Operation Phase
|
Waste
Type |
Source of
Generation |
Total
Amount Generated |
Amount to
be disposed of |
|
Wastes generated
from pre-treatment process |
During pre-treatment sorting of organic waste feedstock |
20
tonnes/day |
20
tonnes/day |
|
Chemical waste |
From plant,
equipment and machinery maintenance and servicing |
Insignificant |
Insignificant |
|
General refuse |
Visitors and on-site
staff |
Insignificant |
Insignificant |
Mitigation of Adverse Environmental Impacts during
Construction Phase
6.41
Adverse
environmental impacts in related to waste management are not expected, provided
that good site practices are strictly followed. Recommendations for good site practices during
the construction phase would include:
·
Obtain
relevant waste disposal permits from appropriate authorities, in accordance
with the Waste Disposal Ordinance (Cap. 354) and subsidiary Regulations and the
Land (Miscellaneous Provisions) Ordinance (Cap. 28);
·
Provide
staff training for proper waste management and chemical handling procedures;
·
Provide
sufficient waste disposal points and regular waste collection;
·
Provide
appropriate measures to minimize windblown litter and dust during
transportation of waste by either covering trucks or by transporting wastes in
enclosed containers;
·
Carry
out regular cleaning and maintenance programme for drainage systems, sumps and
oil interceptors;
·
Separate
chemical wastes for special handling and disposed of to licensed facility for
treatment; and
·
Employ
licensed waste collector to collect waste.
Waste Reduction Measures
6.42
Good
management and control can prevent the generation of a significant amount 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:
·
Design
foundation works that could minimise the amount of excavated material to be
generated;
·
Provide
training to workers on the importance of site cleanliness and appropriate waste
management procedures, including waste reduction, reuse and recycling;
·
Sort
out demolition debris and excavated materials from demolition works to recover
reusable/ recyclable portions (i.e. soil, broken concrete, metal etc.);
·
Segregate
and store different types of waste in different containers, skips or stockpiles
to enhance reuse or recycling of materials and their proper disposal;
·
Encourage
the collection of aluminium cans by providing separate labelled bins to enable
this waste to be segregated from other general refuse generated by the
workforce; and
·
Plan
and stock construction materials carefully to minimize the amount of waste to
be generated and to avoid unnecessary generation of waste.
6.43
In
addition to the above measures, specific mitigation measures are recommended
below for the identified waste so as to minimise environmental impacts during
handling, transportation and disposal of waste.
Excavated
and C&D Materials
·
A
WMP, which becomes part of the Environmental Management Plan (EMP), should be
prepared in accordance with ETWB TCW No.19/2005;
·
A
recording system for the amount of wastes generated, recycled and disposed of (including
the disposal sites) should be adopted for easy tracking; and
·
In
order to monitor the disposal of excavated and C&D material at public
filling facilities and landfills and to control fly-tipping, a trip-ticket
system should be adopted (refer to ETWB TCW No. 31/2004).
6.45
The
Contractor should prepare and implement an EMP in accordance with ETWB TCW No.
19/2005 which describes the arrangements for avoidance, reuse, recovery,
recycling, storage, collection, treatment and disposal of different categories
of waste to be generated from construction activities. Such a management plan should
incorporate site specific factors, such as the designation of areas for
segregation and temporary storage of reusable and recyclable materials. The EMP should be submitted to the
Engineer for approval. The
Contractor should implement waste management practices in the EMP throughout
the construction stage of the Project.
The EMP should be reviewed regularly and updated by the Contractor,
preferably on a monthly basis.
Chemical
Wastes
General
Refuse
6.49
Table
6.5 provides a summary of the various waste types likely to be generated
during the construction of OWTF, together with the recommended handling and
disposal methods.
Table 6.5 Summary
of Waste Handling Procedures and Disposal Routes during Construction Phase
|
Waste Type |
Total Amount
Generated |
Amount to be
disposed of |
Handling Procedure |
Recommended
Disposal Outlets |
|
Excavated materials |
7,000m3 |
1,300m3 |
Segregate and store materials in different containers, skips or
stockpiles to avoid contamination and to enhance reuse of materials and
proper disposal |
Reuse on site as far as practicable |
|
5,700m3 |
Public fill and / or landfill reception facilities |
|||
|
C&D materials |
1,100m3 |
900m3 |
Segregate inert C&D materials from non-inert C&D materials,
while also storing materials in different containers, skips or stockpiles to
avoid contamination and to enhance reuse of materials and proper disposal |
Reuse and recycle as much as possible before disposal of at public
fill reception facilities |
|
200m3 |
Reuse and recycle as much as possible before disposal of at landfills |
|||
|
Chemical waste |
Insignificant |
Insignificant |
Stored on-site in suitably designed containers before being collected
and disposed of by licensed collector |
Recycle by licensed facility and / or dispose of at CWTC |
|
General refuse |
39 kg/day |
18 kg/day |
Provide on-site refuse collection points |
Reuse or recycle as much as possible |
|
21 kg/day |
Deliver to North Lantau Transfer Station (NLTS) for onward
transportation to landfill |
Mitigation of
Adverse Environmental Impacts during Operation Phase
Good
Site Practices
6.50
It
is recommended that the following good operational practices should be adopted
to minimise waste management impacts:
·
Obtain
the necessary waste disposal permits from the appropriate authorities, in
accordance with the Waste Disposal Ordinance (Cap. 354), Waste Disposal
(Chemical Waste) (General) Regulation and the Land (Miscellaneous Provision)
Ordinance (Cap. 28);
·
Nomination
of an approved person to be responsible for good site practice, arrangements
for collection and effective disposal to an appropriate facility of all wastes
generated at the site;
·
Use
of a waste haulier licensed to collect specific category of waste;
·
A
trip-ticket system should be included as one of the contractual requirements
and implemented by the Environmental Team to monitor the disposal of solid
wastes at public filling facilities and landfills, and to control fly tipping.
Reference should be made to ETWB TCW No. 31/2004.
·
Training
of site personnel in proper waste management and chemical waste handling
procedures;
·
Separation
of chemical wastes for special handling and appropriate treatment at a licensed
facility;
·
Routine
cleaning and maintenance programme for drainage systems, sumps and oil
interceptors;
·
Provision
of sufficient waste disposal points and regular collection for disposal;
·
Adoption
of appropriate measures to minimize windblown litter and dust during
transportation of waste, such as covering trucks or transporting wastes in
enclosed containers; and
·
Implementation
of a recording system for the amount of wastes generated, recycled and disposed
of (including the disposal sites).
Waste
Reduction Measures
6.51
Good
management and control can prevent the generation of significant amounts of
waste. It is recommended that the following good operational practices should
be adopted to ensure waste reduction:
·
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;
·
Encourage
collection of aluminium cans, plastic bottles and packaging material (e.g.
carton boxes) and office paper by individual collectors. Separate labelled bins should be
provided to help segregate this waste from other general refuse generated by
the work force; and
·
Any
unused chemicals or those with remaining functional capacity should be reused
as far as practicable.
Wastes Generated from Pre-Treatment Process
Chemical Wastes
6.54
Plant
/ equipment maintenance schedules should be planned in order to minimize the
generation of chemical waste.
6.55
Non-recyclable
chemical wastes and lubricants should be disposed of at appropriate facilities,
such as CWTC. Copies or
counterfoils from collection receipts issued by the licensed waste collector
should be kept for recording purpose.
General
Refuse
6.59
Table
6.6 provides a summary of the various waste types likely to be generated
during the operation of OWTF, together with the recommended handling and
disposal methods.
Table 6.6 Summary
of Waste Handling Procedures and Disposal Routes during Operation Phase
|
Waste Type |
Total Amount
Generated |
Amount to be
disposed of |
Handling Procedure |
Recommended
Disposal Outlets |
|
Wastes generated
from pre-treatment processes |
20 tonnes
/day |
20 tonnes/day |
Provide on-site collection points |
Reuse or recycle as much as possible before delivering to NLTS for
onward transportation to landfill |
|
Chemical waste |
Insignificant |
Insignificant |
Stored on-site in suitably designed containers before being collected
and disposed of by licensed collector |
Recycle by licensed facility and / or dispose of at CWTC |
|
General refuse |
Insignificant |
Insignificant |
Provide on-site refuse collection points |
Reuse or recycle as much as possible before delivering to NLTS for
onward transportation to landfill |
Impacts Caused by
Handling, Collection and Disposal of Waste
6.60
The
assessment should cover the following area: potential hazard, air and odour
emission, noise and wastewater discharge. With the implementation of mitigation
measures recommended in the Sections
6.41 to 6.59, impacts from the above mentioned issue is expected to be
minimal. The issue would be addressed in other relevant sections of this EIA
report.
Contamination Preventive Measures
6.61
With
reference to Clause 3.4.4.3 of the EIA Study Brief, the following tasks have
been conducted in accordance with the Guidance
Manual for Use of Risk-based Remediation Goals for Contaminated Land Management
and the Guidance Note for Contaminated
Land Assessment and Remediation to prevent potential contamination problems
during the operational phase of OWTF:
·
Identify
the possible sources of contamination associated with the operation of the
Project; and
·
Formulate
appropriate operational practices, waste management strategies and
precautionary measures for the prevention of contamination problems.
Potential
Sources of Contamination
6.62 Chemicals would be used during operation of the OWTF and thus some chemical wastes would be generated from the Project. Without proper management of the chemicals and chemical wastes, there is potential for land contamination due to uncontrolled spillages, or improper handling and disposal of these materials.
6.63 The expected types and quantities of the materials involved in operation of the OWTF with contamination potential are presented in Table 6.7.
Table 6.7 Materials
used during the Operational Phase of the Project with Land Contamination
Potential
|
Diesel fuel |
150-200 m3 |
4-5 m3 |
|
Lubrication
oil |
10 – 12 m3 |
2-3 m3 |
|
Caustic soda (NaOH 33 % solution) |
0.5 – 2 m3 |
0.5 – 1.5 m3 |
|
|
50 – 60 m3 |
|
6.64
Chemical
wastes would arise if chemicals are over-ordered and cannot be consumed before
the expiry of the chemicals. Only a minimum amount of waste lubrication oil is
expected to be generated during operation phase.
Approach to Prevent Land Contamination
Fuel
Oil Spillage Prevention
6.65
Precautionary
measures to prevent fuel oil spillage are as follows:
(i)
Fuel Oil Containers
·
Fuel
oil should be stored in suitable containers.
·
All
fuel oil containers should be securely closed.
·
Appropriate
labels showing the name of fuel oil should be posted on the containers.
·
Drip
trays should be provided for all containers.
(ii) Storage Area
·
Distance
between the fuel oil refuelling points and the fuel oil containers should be
minimized.
·
The
storage area should be used for fuel oil storage only.
·
No
surface water drains or foul sewers should be connected to the storage area.
·
The
storage area should be enclosed by three sides by a wall and have an
impermeable floor or surface.
(iii) Fuel Oil Spillage Response
o
Training
Training
on oil spill response actions should be given to relevant staff. The
training should cover the followings:
-
Tools
& resources to combat oil spillage and fire, e.g. locations of oil spill
handling equipment and fire fighting equipment;
-
General
methods to deal with oil spillage and fire incidents;
-
Procedures
for emergency drills in the event of oil spills and fire; and
-
Regular
drills should be carried out.
o
Communication
Establish
communication channel with the Fire Services Department (FSD) and EPD to report
any oil spillage incident so that necessary assistance from relevant department
could be quickly sought.
o
Response Procedures
Any fuel
oil spillage within the Project Site should be immediately reported to the Site
Manager with necessary details including location, source, possible cause and
extent of the spillage.
Site
Manager should immediately attend to the spillage and initiate any appropriate
action to confine and clean up the spillage. The response procedures
should include the following:
-
Identify
and isolate the source of spillage as soon as possible.
-
Contain
the oil spillage and avoid infiltration into soil/ groundwater and discharge to
storm water channels.
-
Remove
the oil spillage.
-
Clean
up the contaminated area.
-
If
the oil spillage occurs during refuelling, the refuelling operation should
immediately be stopped.
-
Recovered
contaminated fuel oil and the associated material to remove the spilled oil
should be considered as chemical waste. The handling and disposal
procedures for chemical wastes are discussed in the following paragraphs.
Chemicals
and Chemical Wastes Handling & Spillage Prevention
6.66
The
precautionary measures to prevent improper handling / use of chemicals and
chemical waste spillage are presented below:
(i)
Chemicals and Chemical
Wastes Handling & Storage
·
Chemicals
and chemical wastes should only be stored in suitable containers in
purpose-built areas.
·
The
storage of chemical wastes should comply with the requirements of the Code of Practice
on the Packaging, Labelling and Storage of Chemical Wastes.
·
The
storage areas for chemicals and chemical wastes should have an impermeable
floor or surface. The impermeable floor / surface should possess the
following properties:
o
Not liable to chemically react with the materials and their containers
to be stored.
o
Able to withstand normal loading and physical damage caused by
container handling
o
The integrity and condition of the impermeable floor or surface should
be inspected at regular intervals to ensure that it is satisfactorily
maintained
·
For
liquid chemicals and chemical wastes storage, the storage area should be bunded
to contain at least 110% of the storage capacity of the largest containers or
20% of the total quantity of the chemicals/chemical wastes stored, whichever is
the greater.
·
Storage
containers should be checked at regular intervals for their structural
integrity and to ensure that the caps or fill points are tightly closed.
·
Chemical
handling should be conducted by trained workers under supervision.
(ii) Chemicals and Chemical Wastes Spillage Response
o
Training
Training
on spill response actions should be given to relevant staff. The training
should cover the followings:
-
Tools
& resources to handle spillage, e.g. locations of spill handling equipment;
-
General
methods to deal with spillage; and
-
Procedures
for emergency drills in the event of spills.
o
Communication
Establish
communication channel with Fire Services Department (FSD) and EPD to report the
spillage incident so that necessary assistance from relevant department could
be quickly sought.
o
Response Procedures
Any
spillage within OWTF site should be reported to the Site Manager.
Site Manager
shall attend to the spillage and initiate any appropriate actions needed to
confine and clean up the spillage. The response procedures should include
the followings:
-
Identify
and isolate the source of spillage as soon as possible;
-
Contain
the spillage and avoid infiltration into soil / groundwater and discharge to
storm water channels (in case the spillage occurs at locations out of the
designated storage areas);
-
Remove
the spillage; the removal method / procedures documented in the Material Safety
Data Sheet (MSDS) of the chemicals spilled should be observed;
-
Clean
up the contaminated area (in case the spillage occurs at locations out of the
designated storage areas); and
-
The
waste arising from the cleanup operation should be considered as chemical
wastes.
Incident Record
6.67
After
any spillage, an incident report should be prepared by the Site Manager.
The incident report should contain details of the incident including the cause of
the incident, the material spilled and estimated spillage amount, and also the
response actions undertaken. The incident record should be kept carefully
and able to be retrieved when necessary.
6.68
The
incident report should provide sufficient details for the evaluation of any
environmental impacts due to the spillage and assessment of the effectiveness
of measures taken.
6.69
In
case any spillage or accidents results in significant land contamination, EPD
should be informed immediately and the Project operator should be responsible
for the clean up of the affected area. The responses procedures described
in Sections 6.65 to 6.66 above should be followed
accordingly together with the land contamination assessment and remediation
guidelines stipulated in the Guidance
Manual for Use of Risk-based Remediation Goals for Contaminated Land Management
and the Guidance Note for Contaminated
Land Assessment and Remediation.
Evaluation of
Residual Impacts
6.70
With
the implementation of mitigation measures recommended for the handling,
transportation and disposal of the identified waste arisings, no residual
impact is expected to arise during the construction and operation stages of the
proposed Project.
Environmental
Monitoring and Audit
6.71
It
would be the Contractor’s responsibility to ensure that all wastes produced during
the construction of the Project are handled, stored and disposed of in
accordance with the recommended good waste management practices and EPD’s
regulations and requirements. A WMP
which would become part of the EMP should be prepared in accordance with ETWB TCW No.19/2005 by the
Contractor. Mitigation measures
recommended in this section should form the basis of the WMP.
6.1
Waste
materials generated from construction activities, such as excavated materials,
C&D materials and general refuse, are recommended to be audited at regular
intervals (at least once per week as part of the regular site inspections
described in EM&A Manual) to ensure that proper storage, transportation and
disposal practices are being implemented.
The Contractor would be responsible for the implementation of mitigation
measures to minimise waste or redress problems arising from the waste
materials.
6.2
Waste
types to be generated during the construction of OWTF would likely to include
excavated materials (from site formation and foundation works), C&D
materials (from building and road construction works), chemical waste (from
maintenance of construction plant and equipment) and general refuse (from
construction workforce). Provided
that waste is handled, transported and disposed of using approved methods and
that the recommended good site practices are strictly followed, adverse
environmental impacts would not be expected during the construction phase.
6.3
During
the operation of OWTF, waste types to be generated would likely include wastes
generated from pre-treatment processes (from pre-treatment sorting of organic
waste feedstock), chemical wastes (from maintenance of mechanical equipment)
and general refuse (from visitors and on-site staff). Provided that waste is also handled,
transported and disposed of using approved methods and that the recommended
good site practices are strictly followed, adverse environmental impacts would
not be anticipated during the operation phase.
6.4
Potential
sources of contamination in OWTF operation have been identified. It is estimated that limited amount of
chemicals or chemical wastes would be used / produced during the operation. Good practices and response procedures
for contamination prevention have been recommended. With proper implementation of the
recommended practices and procedures, the potential for contamination due to
OWTF operation is expected to be minimal.