9.1
Introduction
9.1.1
Waste management would be the
contractor’s responsibility to ensure that all wastes produced during the
construction works for the Project are handled, stored and disposed of in
accordance with good waste management practices and EPD’s regulations and
requirements.
9.1.2
Waste materials generated during
construction activities, such as construction and demolition (C&D)
materials 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.
This monitoring of waste management practices would ensure that these
solid wastes generated during construction are not disposed into the nearby
coastal waters. The Contractor would be
responsible for the implementation of any mitigation measures to minimise waste
or redress problems arising from the waste materials. A waste
management plan (WMP) should be prepared in accordance with ETWB TCW No.
15/2003 and submitted to the Engineer for approval. The monitoring
and auditing requirements of the WMP as detailed in ETWB TCW No. 15/2003 should be
followed with regard to the management of C&D material.
9.2.1
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. 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.
Dredged Marine Sediments
9.2.2
The basic requirements and procedures
for dredged mud disposal are specified under the ETWB TCW No. 34/2002. The management of the dredging, use and
disposal of marine mud is monitored by the MFC, while the licensing of marine
dumping is the responsibility of the Director of Environmental Protection
(DEP).
9.2.3
The dredged marine sediments would be
loaded onto barges and transported to the designated disposal site. Based on the review of the sediment testing
results, it was estimated that some 20,000 m3 of sediments would be
suitable for open sea disposal.
9.2.4
During transportation and disposal of
the dredged marine sediments, the following measures should be taken to
minimise potential impacts on water quality:
·
Bottom opening of barges should be
fitted with tight fitting seals to prevent leakage of material. Excess material should be cleaned from the
decks and exposed fittings of barges and hopper dredgers before the vessel is
moved.
·
Monitoring of the barge loading should
be conducted to ensure that loss of material does not take place during
transportation.
·
Transport barges or vessels should be
equipped with automatic self-monitoring devices as specified by the DEP.
·
Barges or hopper barges should not be
filled to a level that would cause the overflow of materials or sediment-laden
water during loading or transportation.
Good Site Practices
9.2.5
Adverse impacts related to waste
management are not expected to arise, provided that good site practices are
strictly followed. 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 of waste.
·
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.
Waste Reduction Measures
9.2.6
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 individual collectors by providing separate labelled bins to enable this
waste to be segregated from other general refuse generated by the work force.
·
Proper storage and site practices to
minimise the potential for damage or contamination of construction materials.
·
Plan and stock construction materials
carefully to minimise amount of waste generated and avoid unnecessary
generation of waste.
9.2.7
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
9.2.8
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. Preferably an
enclosed and covered area should be provided to reduce the occurrence of 'wind
blown' light material.
Construction and Demolition Material
9.2.9
In order to minimise the impact
resulting from collection and transportation of C&D material for off-site
disposal, the C&D material from the excavation works for road formation and
engineering infrastructure should be reused on-site as backfilling material as
far as practicable. In addition,
granitic rock generated from the tunnelling works for WCR should be exported
for recycling for aggregate.
Chemical Wastes
9.2.10
If chemical wastes are produced at the
construction site, the Contractor would 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 explosive, flammable,
oxidizing, irritant, toxic, harmful, corrosive, etc. The Contractor shall use a licensed collector to transport and
dispose of the chemical wastes, to either the Chemical Waste Treatment Centre
at Tsing Yi, or another licensed facility, in accordance with the Waste
Disposal (Chemical Waste) (General) Regulation.
9.2.11
The implementation schedule for the
recommended waste management mitigation measures is presented in Appendix C.