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
Waste generated by construction
activities are likely to include construction and demolition (C&D)
materials generated from the road 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:
§
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;
§
Training
of site personnel in proper waste management and chemical 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;
§
Regular
cleaning and maintenance programme for drainage systems, sumps and oil
interceptors; and
§
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:
§
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 by providing separate labelled bins to enable this
waste to be segregated from other general refuse generated by the workforce;
§
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 amount of waste
generated and avoid unnecessary generation of waste.
5.2.4
In addition to the above
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
5.2.5
In order to minimise the impact resulting from
collection and transportation of inert C&D material for off-site disposal,
it is recommended that the excavated fill material shall be re-used on-site as
backfill material as far as possible. The surplus excavated material
should be disposed of at the designated public fill reception facility, as
agreed with the Secretary of the Public Fill Committee, for other beneficial
uses. C&D waste would
require disposal to the designated landfill site. In order to monitor the disposal of C&D
materials at the public fill reception facility and landfill and to control
fly-tipping, a trip-ticket system should be included (see ETWB TCW No. 31/2004
for details).
Chemical
Wastes
5.2.6
After
use, chemical wastes (for example, cleaning fluids, solvents, lubrication oil
and fuel) should be handled according to the Code of Practice on the Packaging, Labelling and Storage of Chemical
Wastes. Spent chemicals should be
collected by a licensed collector for disposal at the CWTC or other licensed
facility, in accordance with the Waste
Disposal (Chemical Waste) (General) Regulation.
General Refuse
5.2.7
General refuse should be stored
in enclosed bins or compaction units separate from C&D material. A reputable waste collector should 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.