Table of Contents
6. Waste
management implications
6.2 Environmental
Legislation, Policies, Plans and Standards
6.4 Identification
of Potential Sources of Impacts
6.5 Prediction
and Evaluation of Environmental Impacts
6.6 Mitigation
Measures for Adverse Environmental Impacts
6.7 Evaluation
of Residual Impacts
6.8 Environmental
Monitoring and Audit
6.9 Land
Contamination Assessment
6. Waste
management implications
6.1 Introduction
6.2 Environmental
Legislation, Policies, Plans and Standards
6.3 Assessment
Methodology
6.4 Identification
of Potential Sources of Impacts
6.5 Prediction
and Evaluation of Environmental Impacts
6.6 Mitigation
Measures for Adverse Environmental Impacts
6.7 Evaluation
of Residual Impacts
6.8 Environmental
Monitoring and Audit
6.9 Land
Contamination Assessment
6.10 Conclusions
List of Tables
Table 6‑1 Government Waste Disposal Facilities for
Construction Waste
Table 6‑2 Summary
of Estimated Quantities of Waste Arising from the Project
Table 6‑3 Summary
of Findings of Aerial Photographs Reviewed
Table 6‑4 Potentially
Contaminative Land Uses along Tsuen Wan Road
List
of Figures
Figure 6-1 Locations
and Associated Extent of Cut and Fill Areas
Figure
6-2 Locations of Potential
Contaminated Land Uses
6.1.1
This Chapter identifies the waste, which may arise during the
construction works, and the potential environmental impact resulting from the
handling, collection and disposal of the construction waste. It also presents
an assessment of the potential for the occurrence of ground contamination along
the route of the TWR upgrading works and the potential implications of
alignment widening. This contamination assessment is carried out in accordance
with Annex 19 of the Technical Memorandum on Environmental Impact Assessment
Process (EIAO-TM), while both existing and historical land uses along the
highway footprint have been taken into consideration.
6.1.2
Options for waste minimization, recycling, storage, collection, and
disposal of waste arising from the Project have been examined and procedures
for minimizing environmental impacts due to handling and disposal of waste are
recommended. The handling and disposal of this small amount of
waste are anticipated to have negligible environmental impacts and thus will
not be evaluated further in this EIA Study.
6.2.1
The criteria and guidelines for evaluating waste management
implications are provided in Annexes 7 and 15 of the EIAO-TM. The following
legislation covers, or has some bearing upon, the handling, treatment and
disposal of waste, and are used as assessment criteria:
·
Waste Disposal Ordinance (Cap. 354);
·
Waste Disposal (Chemical Waste) (General)
Regulation (Cap. 354C);
·
Land (Miscellaneous Provisions) Ordinance
(Cap. 28); and
·
Public Health and Municipal Services
Ordinance (Cap. 132) - Public Cleansing and Prevention of Nuisances (Urban
Council) and (Regional Council) By-laws.
6.2.2
The Waste Disposal Ordinance (WDO) prohibits the unauthorized disposal
of waste, with waste defined as any substance or article which is abandoned.
Construction and demolition (C&D) waste is not directly defined in the WDO
but is considered to fall within the category of "trade waste". Trade
waste is defined as waste from any trade, manufacturer or business, or any
waste building, or civil engineering materials, but does not include animal
waste.
6.2.3
Under the WDO, waste can only be disposed of at a licensed site. A
breach of these regulations can lead to the imposition of a fine and/or a
prison sentence. The WDO also provides the issuing of licenses for the
collection and transport of wastes. However, licenses are not currently
required to be issued for the collection and transport of C&D waste and/or
trade waste.
6.2.4
The Waste Disposal (Charges for Disposal of Construction Waste)
Regulation defines construction waste as any substance, matters or things that
is generated from construction work and abandoned, whether or not it has been
processed or stockpiled before being abandoned, but does not include any
sludge, screening or matter removed in or generated from any desludging,
desilting or dredging works.
6.2.5
The Construction Waste Disposal Charging Scheme has come into operation
on 1 December 2005. Processing of account applications by the EPD started on
the same day. Starting from 1 December 2005, main Contractor who undertakes
construction work under a contract with value of HK$1 million or above is
required to open a billing account solely for the contract. Application shall
be made within 21 days after the contract is awarded. Failing this will be an
offence under the law.
6.2.6
For construction work under a contract with value less than HK$1
million, such as minor construction or renovation work, any person such as the
owner of the premises where the construction work takes place or his/her
Contractor can open a billing account; the account can also be used for
contracts each with value less than $1 million. The premises owner concerned
may also engage a Contractor with a valid billing account to make arrangement
for disposal of construction waste.
6.2.7
Charging for disposal of construction waste has been started on 20
January 2006 and from this day, any person before using waste disposal
facilities for disposal of construction waste needs to open an account.
6.2.8
The scheme encourages reduce, reuse and sorting of construction waste
such that the waste producer can minimize their disposal fee. Table 6-1 summarizes the government
construction waste disposal facilities, types of waste accepted and disposal
cost.
Table 6‑1 Government
Waste Disposal Facilities for Construction Waste
Government
Waste Disposal Facilities |
Type of
Construction Waste Accepted |
Charge Per Tonne (HK$) |
Public fill reception facilities |
Consisting entirely of inert construction waste |
27 |
Sorting facilities |
Containing more than 50% by weight of inert construction waste |
100 |
Landfills |
Containing not more than 50% by weight of inert construction waste |
125 |
Outlying Islands Transfer Facilities |
Containing any percentage of inert construction waste |
125 |
6.2.9
Chemical waste as defined under the Waste Disposal (Chemical Waste)
(General) Regulation (the Regulation) includes any substance being scrap
material, or unwanted substances specified under Schedule 1 of the Regulation
if such substance or chemical occurs in such a form, quantity or concentration
so as to cause pollution or constitute a danger to health or risk of pollution
to the environment.
6.2.10
A person should not produce, or cause to be produced, chemical wastes
unless they are registered with EPD. Any person who contravenes this
requirement commits an offence and is liable to a fine and /or imprisonment.
6.2.11
Producers of chemical wastes must treat their wastes, utilising on-site
plant licensed by EPD, or have a licensed collector take the wastes to a
licensed facility. For each consignment, the waste producer, collector and
disposer of the wastes must sign all relevant parts of a ‘trip ticket’, this
system is designed to allow the transfer of wastes to be traced from cradle to
grave.
6.2.12
The Regulation prescribes the storage facilities to be provided on site
including labelling and warning signs. To minimize the risks of pollution and
danger to human health or life, the waste producer is required to prepare and
make available, written procedures to be observed in the case of emergencies
due to spillage, leakage or accidents arising from the storage of chemical
wastes. They must also provide employees with training in such procedures.
6.2.13
Construction and demolition material, which is wholly inert, may be
taken to public filling areas. Public filling areas usually form part of land
reclamation schemes and are operated by the Civil Engineering and Development
Department (CEDD). The Ordinance requires that public filling licences are
obtained by individuals or companies who deliver inert C&D material (or
public fill) to public filling areas. The licences are issued by CEDD under
delegated powers from the Director of Lands.
6.2.14
Individual licenses are issued for each vehicle involved. Under the
license conditions, public filling areas will accept only inert building
debris, soil, rock and broken concrete. There is no size limitation on the rock
and broken concrete, and a small amount of timber mixed with other suitable
materials is permissible. However, the material should 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
filling supervisor.
6.2.15
These By-laws provide a further control on the illegal tipping
of wastes on unauthorised (unlicensed) sites. The illegal dumping of wastes can
lead to fines and/or imprisonment.
6.2.16
Other guideline documents, which detail how the Contractor should
comply with waste-related regulations are as follows:
a) Waste
Disposal Plan for Hong Kong (1989), Planning, Environment and Lands Branch
Government Secretariat, Hong Kong Government;
b) Environmental Guidelines for Planning In Hong
Kong (1990), Hong Kong Planning and Standards Guidelines, Hong Kong Government;
c) New Disposal Arrangement for Construction
Waste (1992), Environmental Protection Department & Civil Engineering
Department, Hong Kong Government;
d) Code of Practice on the Packaging, Labelling
and Storage of Chemical Wastes (1992), Environmental Protection Department,
Hong Kong Government;
e) Works
Branch Technical Circular No. 32/92, The Use of Tropical Hard Wood on
Construction Site, Works Branch, Hong Kong Government;
f) Works Branch Technical Circular No. 2/93,
Public Dumps, Works Branch, Hong Kong Government;
g) Works Branch Technical Circular
No. 2/93B, Public Filling Facilities, Works Branch, Hong Kong Government;
h) Works Branch Technical Circular No. 16/96, Wet
Soil in Public Dumps, Works Branch, Hong
Kong Government;
i)
Waste Reduction Framework Plan, 1998 to
2007, Planning, Environment and Lands Bureau, Government Secretariat (1998);
j)
Works
Bureau Technical Circular No. 4/98, Use of public Fill in Reclamation and Earth
Filling Projects, Hong Kong Government
k) Works Bureau Technical Circular
Nos. 25/99, 25/99A and 25/99C, Incorporation of Information on Construction and
Demolition Material Management in Public Works Sub-committee Papers, Works
Bureau, Hong Kong SAR Government;
l)
Works
Bureau Technical Circular No. 19/99, Metallic Site Hoardings and Signboards,
Works Bureau, Hong Kong SAR Government;
m) Works Branch Technical Circular No. 12/2000,
Fill Management, Works Bureau, Hong
Kong SAR Government;
n) Environment, Transport and Works Bureau
Technical Circular (Works) No 33/2002, Management of Construction and
Demolition Material Including Rock, Environment, Transport and Works Bureau, Hong
Kong SAR Government;
o) Environment, Transport and Works Bureau
Technical Circular (Works) No. 15/2003, Waste
Management on Construction Sites, Environment, Transport and Works Bureau, Hong
Kong SAR Government;
p) Environment, Transport and Works Bureau
Technical Circular (Works) No. 31/2004, Trip
Ticket System for Disposal of Construction & Demolition Materials,
Environment, Transport and Works Bureau, Hong Kong SAR Government; and
q)
Works
Branch Technical Circular No. 19/2005, Environmental Management on Construction
Sites, Works Bureau, Hong Kong SAR Government.
6.2.17
The assessment of contaminated land in Hong Kong is currently
undertaken in accordance with the following documents:
a) Environmental Protection Department (1994) Practice
Note for Professional Persons on Contaminated Land Assessment and Remediation.
ProPECC PN 3/94;Environmental Protection Department Guidance Note
for Contaminated Land Assessment and Remediation (issued on 15 August 2007);
b)
Environmental Protection
Department Guidance Manual for Use of Risk-based Remediation Goals for
Contaminated Land Management (issued on July 2007);
c) Environmental Protection Department (1999)
Guidance Note for Investigation and Remediation of Contaminated Sites of Petrol
Filling Stations, Boatyards and Car Repair/Dismantling Workshops; and
d)
Annex 19
of the EIAO-TM.
6.2.18
Annex 19 of the EIAO-TM identifies a number of land uses, which have
the potential to cause land contamination. These uses include, but are not
limited to, the following:
·
oil
installations including oil depots and petrol filling stations;
·
gas
works;
·
power
stations;
·
shipyards/boatyards;
·
chemical
manufacturing/processing plants;
·
steel
mills/metal workshops;
·
car
repairing and dismantling workshops; and
·
dumping
grounds and landfills.
6.2.19
If any of the above land uses (or other potentially contaminative land
uses) is identified as part of the EIA Study, a Contamination Assessment Plan
(CAP) should be submitted to the Director for endorsement prior to conducting a
contamination assessment of the site.
6.3.1
The assessment of waste management implications has been conducted in
accordance with Annexes 7 and 15 of the EIAO-TM. This includes:
·
estimation of types and quantities of wastes generated;
·
assessment of potential impact caused by handling (including labelling,
packaging and storage), collection, and disposal of wastes with respect to
potential hazard, air and odour emission, noise, wastewater discharge and
public transport; and
·
determination of practical mitigation measures for the environmental
impacts.
6.4.1
Construction activities will result in the generation of a variety of
wastes which can be divided into distinct categories based on their
constituents, as follows:
·
construction and demolition (C&D)
material;
·
chemical waste; and
·
general refuse.
6.5.1
The nature and preliminary quantities of each of these waste types
arising from the proposed works are identified in this section. The detailed
calculations of materials and waste arising are required to be submitted to
Government under the requirements of WBTC 25/99 during the detailed design. Table
6-2 summarizes the estimated quantities of different types of waste arising
from the Project.
Table 6‑2 Summary
of Estimated Quantities of Waste Arising from the Project
Waste Type |
Source |
Total Quantity |
Handling |
Quantity to be reused on-site |
Quantity to be disposed of off-site |
C&D Material |
Excavation for foundation |
Inert: 29,700 m3 Non-inert: 1,400 m3 |
Sorted on-site into inert and non-inert C&D material |
14,700 m3 of inert C&D material as filling material
for abutment wall and 10,000 m3 as fill embankment |
85,500 m3 inert C&D material to public filling
facilities*; 2,500 m3 non-inert C&D material to landfill* |
Excavation and site clearance for at grade road construction |
Inert: 7,800 m3 Non-inert: 100 m3 |
||||
Excavation and site clearance for cut slopes |
Inert: 56,500 m3 Non-inert: 300 m3 |
||||
Excavation and site clearance for other formation works |
Inert: 2,100 m3 Non-inert: 300 m3 |
||||
Chemical Waste |
Scrap batteries, spent acid/alkali, spent mineral oil/ cleaning
fluid, spent solvent, engine oil and fuel from construction plants or equipment |
Few hundred litres per month |
Collected by licensed company; Stored on-site within suitably
designed containers |
-- |
Few hundred litres per month |
General Refuse |
Food waste, waste paper, aluminium cans etc generated from workforce |
Approximately 280 kg per day (preliminary estimate based on
workforce of 200) |
Collected by on-site refuse collection point and transferred to
landfill or recycling company |
-- |
Approximately 280 kg per day (preliminary estimate based on
workforce of 200) |
Note: * A factor
of 1.2 is applied in the estimate of C&D waste quantity to be disposed of
off-site.
6.5.2
C&D material would be generated
during the foundation works, road widening and associated slope works,
reprovision of slip roads and local access roads, as well as other formation
works. Types of C&D material
include soil, rock, concrete, bituminous material and timber etc, the total
quantity of the C&D material generated in the Project is estimated to be
approximately 98,000 m3. Among this, about 25,000 m3 of
inert C&D material would be reused on-site as filling material.
Approximately 85,500 m3 of inert C&D material would be disposed
of to public filling facilities for other beneficial uses and about 2,500 m3
of non-inert C&D waste would be disposed of to designated landfills. Figure
6-1 shows the locations and associated extent of the cut and fill areas in
the Project.
6.5.3
Chemical Waste, as defined under the Waste Disposal (Chemical Waste)
(General) Regulation, includes any substance being scrap material, or
unwanted substances specified under Schedule 1 of the Regulation. A complete
list of such substances is provided under the Regulation, however substances
likely to be generated by construction activities will, for the most part,
arise from the maintenance of equipment. These may include, but not limited to,
the following:
·
scrap batteries or spent acid/alkali from
their maintenance;
·
used engine oils, hydraulic fluids and
waste fuel;
·
spent mineral oils/cleaning fluids from
mechanical machinery; and
·
spent solvents/solutions, some of which
may be halogenated, from equipment cleaning activities.
6.5.4
It is difficult to quantify the amount of chemical waste which will
arise from the construction activities as it will be highly dependent on the
Contractor's on-site maintenance intention and the number of plants and
vehicles utilised. However, it is anticipated that the quantity of chemical
waste, such as lubricating oil and solvent produced from plant maintenance will
be small, (in the order of a couple of hundred litres per month) and will be
readily accepted at the Chemical Waste Treatment Facility (CWTF) or other
licensed waste oil recycling facilities. The actual amount of chemical wastes
generated should be quantified and recorded in the Site Waste Management Plan
to be prepared by the Contractor.
6.5.5
Construction site workers, site offices and canteens will result in the
generation of a variety of general refuse requiring disposal. General refuse
generated on site will mainly consist of food wastes, aluminum cans and waste
paper.
6.5.6
The likely maximum number of workers on-site at any one time during the
construction period is 200 people. This is likely to occur at the busiest
period of the works, around the end of Year 2011 to Year 2012.
6.5.7
Projections of general refuse generation are generated by EPD, in
accordance with “Monitoring of Solid Waste in Hong Kong 1999”. Linear
projections based on previously recorded data indicate that this rate will
increase to 1.3 and 1.4kg/person/day in Year 2011 and Year 2015 respectively.
6.5.8
Therefore, it is predicted that during the period of peak activity,
approximately 0.28 tonne/day of general refuse would be produced.
6.6.1
The Contractor is responsible for the management of materials and
wastes during construction. This includes control of wastes on site, removal of
the waste materials from the site and the implementation of any mitigation
measures to minimise waste or redress any problems that arise from waste
associated with the works. In addition to C&D waste and domestic wastes,
this material may include sewage, wastewater or any other site discharges on to
adjacent land, sewers, or water courses.
6.6.2
This section sets out the measures to be adopted to avoid or minimise
potential adverse impacts associated with waste arising from the works under
the headings of each waste type. The Contractor should incorporate these
recommendations into a comprehensive on-site Waste Management Plan, (WMP). If,
for any reason, the recommendations cannot be implemented, full justification
should be given in the WMP.
6.6.3
In accordance with ETWBTC(W) No 15/2003 – Waste Management on
Construction Site, the WMP should be prepared and submitted for approval by
the Architect/ Engineer/ Supervising Officer prior to any construction
activities. During the construction period the WMP should be used as a working
document to detail the on-going management procedures and to record waste
arising from construction works and import of fill throughout the Contract. The
WMP shall be subject to audit under the requirements of the Environmental
Monitoring and Audit (EM&A) Procedures set out in the EM&A Manual
accompanying this EIA Report.
6.6.4
The WMP shall be developed and implemented according to a best-practice
philosophy of waste management. There are various waste management options,
which can be categorized in terms of preference from an environmental
viewpoint. The options considered to be more preferable have the least impacts
and are more sustainable in a long-term context. The hierarchy is as follows:
·
avoidance and minimisation, i.e. avoiding
or not generating waste through changing or improving practices and design;
·
reuse of materials, thus avoiding disposal
(generally with only limited reprocessing);
·
recovery and recycling, thus avoiding
disposal (although reprocessing may be required); and
·
treatment and disposal, according to
relevant laws, guidelines and good practice.
6.6.5
The Waste Disposal Authority should be consulted by the Contractor on
the final disposal of wastes.
6.6.6
The suitability (or otherwise) of material for reuse on site shall be
detailed in the WMP. If, for any reason, the recommendations cannot be
implemented, full justification should be given in the WMP for approval by
Architect/Engineer/Supervising Officer according to ETWBTC(W) No. 15/2003.
6.6.7
To facilitate adoption of the best-practice philosophy, training shall
be provided to all personnel working on site. The training shall promote the
concept of general site cleanliness and clearly explain the appropriate waste
management procedures defined in the WMP. Overall, the training should
encourage all workers to reduce, reuse and recycle wastes.
6.6.8
During construction, the WMP should be kept up-to-date on a monthly
basis with records of the actual quantities of wastes generated, recycled and
disposed of off-site. Quantities shall be determined by weighing each load or
other methods agreed to by the Engineer’s Representative. Waste shall only be
disposed of at licensed sites and the WMP should include procedures to ensure
that illegal disposal of wastes does not occur. Only waste haulers authorized
to collect the specific category of waste concerned should be employed and a
trip ticket system shall be implemented for offsite disposal of C&D and
solid waste at public filling facilities and landfills. Appropriate measures
should be employed to minimize windblown litter and dust during transportation
by either covering trucks or transporting wastes in enclosed containers.
6.6.9
Work site(s) shall be arranged and managed to facilitate the proper
management of wastes and materials. The WMP shall include plans indicating
specific areas designated for the storage of particular types of waste,
reusable and recyclable materials as well as areas and management proposals for
any stockpiling areas. Waste storage areas should be well maintained and
cleaned regularly. Specific provisions for different types of material are outlined
below. In general, these areas should be designed to avoid cross contamination
of materials as well as pollution of the surrounding environment.
6.6.10
In order to minimize the impact
resulting from collection and transportation of C&D material for off-site
disposal, it is recommended that the excavated fill material should be reused
on site as backfill material as far as possible. Also, careful design, planning
and good site management should be maintained in order to minimise over
ordering and generation of surplus materials such as concrete, mortars and
cement grouts. The design of formwork should maximise the use of standard wooden
panels so that high reuse levels can be achieved. Alternatives such as steel formwork
or plastic facing should be considered to increase the potential for reuse.
6.6.11
C&D materials should be segregated on site into different waste and
material types. This will increase the feasibility of certain components of the
waste stream being recycled by specialised contractors. The Contractor should
clearly demonstrate in the WMP how he intends to maximise the reuse of C&D
material on-site. Where reuse of materials on site is not feasible, the
Contractor should explore opportunities for recycling materials off-site. Inert
C&D materials shall be reused on site as much as possible or recycled with
the remaining non-inert materials which cannot be reused or recycled being
disposed of to landfill.
6.6.12
Potential opportunities for recycling and reuse of C&D materials
from the Project include:
·
milling wastes arising from regrading of
the existing pavement could be recycled on site and reused as either road-base
in the new carriageways or fill for new embankments;
·
existing marginal roadside barriers
comprise pre-cast units, which may be possible to be reused in the following
widening works; and
·
existing bridge parapets comprise
aluminum post and railings, which have a recyclable value and could be sold for
reconditioning or reused for scrap metal.
6.6.13
Any stockpile should be sited away from
existing watercourses and suitably covered to prevent wind erosion and impacts
on air and water quality. Measures for impacts on air and water quality are
described in Chapters 4 and 5 in this report, respectively.
6.6.14
Chemical waste should be handled in accordance with the Code of
Practice on the Packaging, Handling and Storage of Chemical Wastes as
follows. Containers used for the storage of chemical wastes should:
·
be suitable for the substance they are
holding, resistant to corrosion, maintained in a good condition, and securely
closed;
·
have a capacity of less than 450L unless
the specifications have been approved by the EPD; and
·
display a label in English and Chinese in
accordance with instructions prescribed in Schedule 2 of the Waste Disposal
(Chemical Waste) (General) Regulation (Cap. 354C).
6.6.15
The storage area for chemical wastes should:
·
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 110% 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 disposed as chemical waste
if necessary); and
·
be arranged so that incompatible
materials are adequately separated.
6.6.16
The Contractor shall register with EPD as a Chemical Waste Producer.
Waste oils and other chemical wastes as defined in the Waste Disposal
(Chemical Waste) (General) Regulation will require disposal by appropriate
means and could require pre-notification to EPD prior to disposal. Appropriate
means include disposal:
·
via a licensed waste collector; and
·
to a facility licensed to receive
chemical waste, such as the Chemical Waste Treatment Facility which also offers
a chemical waste collection service and can supply the necessary storage
containers; or
·
to a reuser of the waste, under approval
from EPD. The Centre for Environmental Technology operates a Waste Exchange
Scheme, which can assist in finding receivers or buyers.
6.6.17
General refuse generated on-site should be stored in enclosed bins or
compaction units separate from construction and chemical wastes. A reputable
waste collector should be employed by the Contractor to remove general refuse
from the site, separately from construction and chemical wastes, on a daily or
every second day basis to minimize odour, pest and litter impacts. The burning
of refuse on construction sites is prohibited by law.
6.6.18
General refuse is generated largely by food service activities on site,
so reusable rather than disposable dishware should be used if feasible.
Aluminum cans are often recovered from the waste stream by individual
collectors if they are segregated or easily accessible. Therefore separate,
labelled bins for their deposit should be provided if feasible.
6.6.19
Office waste can be reduced through recycling of paper if volume is
large enough to warrant collection. Participation in a local collection scheme
should be considered if one is available.
6.7.1
With the implementation of the recommended mitigation measures for the
handling, transportation and disposal of the identified waste arising from the
Project, the residual impact is expected to be minimal.
6.8.1
It is 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 good waste management practices and relevant
regulations and requirements. The mitigation measures recommended in Section
6.6 should form a basis of the WMP to be developed by the Contractor in the
construction phase of the Project.
6.9.1
The objective of this assessment is to identify and evaluate the
potential soil contamination along TWR alignment and if required, develop an
assessment plan to determine the extent of any contamination present. In order
to achieve this the following has been undertaken:
·
review of the current and historical land
use of the site to evaluate whether there is the potential for any soil or
groundwater contamination to have occurred;
·
assess any potential environmental
impacts arising as a result of land contamination or during future use of the
land; and
·
site visits to confirm land uses and
likely impacts of any land contamination identified.
6.9.2
In order to achieve the above, the following sources of information
have been collated and reviewed:
·
road alignment maps;
·
Hong Kong Government Survey maps along
the alignment;
·
aerial photographs of the alignment; and
·
selected Outline Zoning Plans (OZPs)
along the alignment.
6.9.3
In addition to the above, site visits were undertaken on the 14 August
2007 along the road alignment to confirm land uses and identify potential land
contamination sources.
6.9.4
The site history information of the Study Area was obtained by
reviewing the relevant aerial photographs. Table
6-3 summarizes the findings
of the aerial photographs reviewed.
Table 6‑3 Summary of Findings of Aerial
Photographs Reviewed
Year |
Notes |
1960’s |
Study Area was predominantly
occupied by farmlands, fishponds and included an oil depot. |
1970’s |
Study Area was predominantly
occupied by squatters, container terminals and included an oil depot. |
2007 |
Study Area is predominantly
occupied by industrial buildings, residential areas, construction sites for
residential development (i.e. TW5, TW6 and TW7), and includes Gin Drinker’s
Bay Restored Landfill. |
6.9.5
The oil depot that was formerly present within the Study Area during
the 1960’s and 70’s is believed to have been decommissioned some time in the
1980’s. The Site Boundary for the TWR Upgrading Works does not encroach upon
the area formerly occupied by the oil depot.
6.9.6
During a detailed walk over site survey on 14 August 2007, potentially
contaminative land uses in the vicinity of TWR have been identified. Figure 6-2 shows the locations of the
potential contaminated land uses within the Study Area. Details are summarized in Table 6-4.
Table 6‑4 Potentially
Contaminative Land Uses along Tsuen Wan Road
No |
Potentially
Contaminative Land Use |
Location |
1 |
Dying Factory
(慶豐染廠有限公司) |
Pun Shan Street |
2 |
Dying Factory
(香港中央紡織有限公司) |
Chai Wan Kok Street |
3 |
Petrol Station |
Chai Wan Kok Street |
4 |
Car Repairing Store |
Tai Pa Street |
5 |
Pier |
Beside MTR TW5 Development Area |
6 |
Dying Factory
(金泰線廠有限公司) |
Ma Tau Pa Road |
7 |
Dying Factory (半島針織廠) |
Wan Lung Street |
8 |
Oil Depot |
Kwai Fu Street |
9 |
Petrol Station |
Container Port Road |
10 |
Gin Drinkers Bay Restored Landfill |
Kwai Tsing Road |
6.9.7
The proposed TWR alignment is not anticipated to directly encroach upon
any areas occupied by these potentially contaminative uses.
6.9.8
A number of potentially contaminative land uses have been identified in
the vicinity of TWR. However, the TWR Upgrading works will not encroach upon
any of these identified land uses. It is not anticipated that contaminated
material will be encountered during the works and thus there are minimal
implications with respect to construction worker exposure to contaminated
material and contaminated material disposal.
6.9.9
Since the TWR Upgrading works are not anticipated to encroach upon any
of the identified potentially contaminative land uses, a detailed contaminated
land site investigation prior to the works is not required.
6.10.1
The Project is likely to result in the generation of a variety of
wastes and require the management and disposal of C&D material, chemical
waste and general refuse. Provided that the wastes are managed using approved
methods described above, no unacceptable adverse environmental impacts will be
envisaged.
6.10.2
The mitigation measures recommended in this Chapter should be
incorporated into a WMP and applied through the contract documents to ensure
that environmental nuisance does not arise.
6.10.3
There are a number of land uses adjacent to TWR that, according to
Section 3.1 of Annex 19 of the EIAO-TM, have the potential to cause land
contamination. The proposed TWR Upgrading works are not anticipated to encroach
upon these areas, and therefore further contaminated land site investigation
and assessment is not required.