5.1.1
Waste management during construction
phase will 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 good waste management practices and EPD’s
regulations and requirements.
5.1.2
Other waste materials
generated during construction activities are likely to include construction and
demolition (C&D) materials generated from the road widening works,
associated slope works and construction of noise barriers, general refuse from
the workforce and chemical waste generated from the maintenance and servicing
of construction plant and equipment.
It is recommended that waste materials generated during the construction
activities to be audited at regular intervals (at least quarterly) to ensure
that proper storage, transportation and disposal practices are being
implemented. This monitoring of
waste management practices will ensure that these solid wastes generated during
construction are not disposed of into the surrounding water receiving
bodies. The Contractor will be
responsible for the implementation of any mitigation measures to minimize waste
or redress problems arising from the waste materials.
5.2.1
Mitigation measures for
waste management are summarised below.
With the appropriate handling, storage and removal of waste arising
during the construction works as defined below, the potential to cause adverse
environmental impacts will be minimised.
The implementation schedule of the recommended mitigation measures is presented
in Appendix A. During the site
inspections, the ET shall pay special attention to the issues relating to waste
management and check whether the Contractor has implemented the recommended
good site practices and other mitigation measures.
Good Site Practices
5.2.2
Adverse impacts related
to waste management are not expected to arise, provided that good site
practices are adhered to.
Recommendations for good site practices during the construction
activities include:
Ÿ
Nomination of an
approved person, such as a site manager, to be responsible for good site
practices, arrangements for collection and effective disposal to an appropriate
facility, of all wastes generated at the site;
Ÿ
Training of site
personnel in proper waste management and chemical handling procedures;
Ÿ
Provision of sufficient
waste disposal points and regular collection of waste;
Ÿ
Appropriate measures to
minimise windblown litter and dust during transportation of waste by either
covering trucks or by transporting wastes in enclosed containers;
Ÿ
Regular cleaning and
maintenance programme for drainage systems, sumps and oil interceptors;
Ÿ
Separation of chemical
wastes for special handling and appropriate treatment at the Chemical Waste
Treatment Centre (CWTC); and
Ÿ
A recording system for
the amount of wastes generated, recycled and disposed of (including the
disposal sites).
Waste Reduction Measures
5.2.3
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:
Ÿ
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;
Ÿ
Encourage collection of
aluminium cans by providing separate labelled bins to enable this waste to be
segregated from other general refuse generated by the workforce;
Ÿ
Any unused chemicals or those
with remaining functional capacity shall be recycled;
Ÿ
Use of reusable
non-timber formwork to reduce the amount of C&D material;
Ÿ
Prior to disposal of
C&D waste, it is recommended that wood, steel and other metals shall be
separated for reuse and/or recycling to minimise the quantity of waste to be
disposed of to landfill;
Ÿ
Proper storage and site
practices to minimise the potential for damage or contamination of construction
materials; and
Ÿ
Plan and stock
construction materials carefully to minimise amount of waste generated and
avoid unnecessary generation of waste.
5.2.1
In addition to the above
measures, specific mitigation measures are recommended below for the identified
waste arising to minimise environmental impacts during handling, transportation
and disposal of these wastes.
General Refuse
5.2.2
General refuse should be
stored in enclosed bins or compaction units separate from C&D
materials. A reputable waste
collector should be employed by the contractor to remove general
refuse from the site, separately from C&D materials. Preferably an enclosed and covered area
should be provided to reduce the occurrence of 'wind blown' light
material.
Construction and
Demolition Material
5.2.3
In order to minimise
impacts resulting from collection and transportation of C&D material for
off-site disposal, the excavated material from the foundation construction of
the sewage pumping station should be reused on-site as fill material as far as
possible.
5.2.4
When disposing C&D
material at a public fill reception facility, it shall be noted that the
material shall only consist of earth, building debris and broken rock and
concrete. The material shall be free from marine mud, household refuse,
plastic, metals, industrial and chemical waste, animal and vegetable matter and
other material considered to be unsuitable by the Filling Supervisor.
Chemical Wastes
5.2.5
Under the Waste
Disposal (Chemical Waste) (General) Regulations, all producers of chemical
waste must register with the EPD as a chemical waste producer and to follow the
guidelines stated in the Code of Practice on the Packaging, Labelling and
Storage of Chemical Wastes.
5.2.6
The Regulations also
prescribes that the chemical waste producers should treat their wastes, either
utilizing on-site plant licensed by EPD, or arranging for a licensed collector
to transport and dispose of the chemical wastes, to either the approved CWTC,
or another licensed facility.
5.2.7
Good quality containers
compatible with the chemical wastes should be used, and incompatible chemicals
should be stored separately. Appropriate
labels should be securely attached on each chemical waste container indicating
the corresponding chemical characteristics of the chemical waste, such as
explosive, flammable, oxidizing, irritant, toxic, harmful, corrosive, etc.
5.2.8
The storage facilities
to be provided on site, including labeling and warning signs, and require the
preparation of written procedures and training to deal with emergencies such as
spillages, leakages of accidents arising from the storage of chemical wastes.