5.1.1
Waste management shall be the
Contractor’s responsibility to ensure that all wastes produced during the
construction works for the drainage improvement works are handled, stored and
disposed of in accordance with good waste management practices and EPD’s
regulations and requirements.
5.1.2
Waste materials generated during
construction activities, such as construction and demolition (C&D)
material, chemical wastes and general refuse, are recommended to be audited at
regular intervals (at least quarterly) to ensure that proper storage,
transportation and disposal practices are being implemented. The Contractor
shall be responsible for the implementation of any mitigation measures to
minimise 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 arisings during the construction works as defined below, the
potential to cause adverse environmental impacts would 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 and Waste Reduction
Measures
5.2.2
Appropriate waste handling,
transportation and disposal methods for all waste arisings generated during the
construction works shall be implemented to ensure that construction wastes do
not enter the river and stream channels.
5.2.3
It is expected that adverse impacts
from waste management would not arise, provided that good site practices are
strictly followed. Recommendations for good site practices during construction
to be carried out by the Contractor include:
·
nomination
of approved personnel, such as a site manager, to be responsible for good site
practices, and making arrangements for collection of all wastes generated at
the site and effective disposal to an appropriate facility;
·
training
of site personnel in proper waste management and chemical waste handling
procedures;
·
provision
of sufficient waste 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 the
Chemical Waste Treatment 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
(including the disposal sites) should be proposed; and
·
a
Waste Management Plan shall be prepared by the Contractor and submitted to ER for approval. One may make reference to ETWB TCW No. 15/2003 for details.
5.2.4
In order to monitor the disposal of
C&D material at landfills and public filling areas, as appropriate, and to
control fly tipping, a trip-ticket system shall be included as one of the
contractual requirements to be implemented by the Contractor and audited by the
ET. One may make reference to ETWB TCW
No. 31/2004 for details.
5.2.5
Good management and control can
prevent the generation of significant amounts 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 to be carried out by
the Contractor include:
·
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 by individual collectors, separate labelled bins
shall be provided to segregate this waste from other general refuse generated
by the work force;
·
any
unused chemicals or those with remaining functional capacity shall be recycled;
·
maximising
the use of reusable steel formwork to reduce the amount of C&D material;
·
prior
to disposal of C&D waste, it is recommended that wood, steel and other
metals shall be separated for re-use and / or recycling to minimise the
quantity of waste to be disposed of to landfill;
·
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 amount of waste
generated and avoid unnecessary generation of waste.
5.2.6
In addition to the above good site
practices and waste reduction measures, specific mitigation measures are
recommended below for the identified waste arisings to minimise environmental
impacts during handling, transportation and disposal of these wastes.
Construction and Demolition Material
5.2.8
When disposing C&D material at a
public filling area, it shall be noted that the material shall only consist of
soil, rock, concrete, brick, cement plaster/mortar, inert building debris,
aggregates and asphalt. 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.
5.2.9
The C&D material generated from
demolition of existing structures should be sorted on-site into inert C&D
material (that is, public fill) and C&D waste. The proposed disposal sites for the public fill and C&D waste
are the Fill Bank at Tseung Kwan O Area 137 and SENT Landfill,
respectively. Suitable areas should be
designated within the works site boundaries for temporary stockpiling of
C&D material. Within stockpile
areas, the following measures should be taken to control potential
environmental impacts or nuisance:
·
covering
material during heavy rainfall;
·
locating
stockpiles to minimise potential visual impacts; and
·
minimising
land intake of stockpile areas as far as possible.
Excavated Riverbed Material
5.2.10
It is anticipated that the excavated
riverbed material may need to be temporarily stockpiled on-site prior to
disposal off-site. Details of
environmental control measures to be taken at the stockpiling area to prevent
water pollution are discussed in Section 4. Use of water-tight trucks
would be required for the transportation of excavated riverbed material to the
designated barging point for disposal at the designated public filling area, or
transported directly to the public filling area. The proposed disposal site for the excavated material is the Fill
Bank at Tseung Kwan O Area 137.
Chemical Wastes
5.2.11
If chemical wastes are produced at the
construction site, the Contractor shall be required to register with the EPD as
a Chemical Waste Producer and to follow the guidelines stated in the Code of
Practice on the Packaging, Labelling and Storage of Chemical Wastes. Good
quality containers compatible with the chemical wastes should be used, and
incompatible chemicals should be stored separately. Appropriate labels should be securely attached on each chemical
waste container indicating the corresponding chemical characteristics of the
chemical waste, such as explosives, flammable, oxidizing, irritant, toxic,
harmful, corrosive, etc. The Contractor
shall use a licensed collector to transport and dispose of the chemical wastes
generated at the Chemical Waste Treatment Centre at Tsing Yi, or other licensed
facility, in accordance with the Waste Disposal (Chemical Waste) (General)
Regulation.
General Refuse
5.2.12
General refuse should be stored in
enclosed bins or compaction units separate from C&D material. A reputable
waste collector shall be employed by the Contractor to remove general refuse
from the site, separately from C&D material. An enclosed and covered area
is preferred to reduce the occurrence of 'wind blown' light material.