5.1
Waste management would be the contractor’s responsibility to
ensure that all wastes produced during the construction works for the heliport
expansion extension
of Siu Ho Wan WTW
aare handled, stored and disposed of in accordance
with good waste management practices and EPD’s regulations and requirements.
5.2
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 of into
the nearby marine watersstreams
or drainage channel. The audits shall also check that any chemical
wastes generated during maintenance of construction equipment and vehicles are
not stored within the sites of the Siu Ho Wan WTW, and the Pui O Raw Water
Pumping Stations and Pui
O No.2 Raw Water Pumping Station. The Contractor would be
responsible for the implementation of any mitigation measures to minimise waste
or redress problems arising from the waste materials.
5.3
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.
5.4
Recommendations for good site practices during the
construction activities include:
·
nomination
of an approved personnel, such as a site manager, to be responsible for the
implementation of 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 site cleanliness, appropriate waste management procedures
and concepts of waste reduction, reuse and recycling;
·
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;
·
a waste
management plan (WMP) should be prepared in accordance with ETWB TCW No.
15/2003 and submitted to the Engineer for approval.
5.5
General refuse should be stored in enclosed bins or
compaction units. A reputable
waste collector should be employed by the contractor to remove general refuse
from the site. An enclosed and
covered area is preferred to reduce the occurrence of 'wind blown' light
material.
5.6
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. The Waste
Disposal Ordinance (Cap 354) and its subsidiary regulations, in particular the
Waste Disposal (Chemical Waste) (General) Regulation, should be observed and
complied with for control of chemical wastes. 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.
5.7
Disposal of chemical wastes should be carried out
in compliance with the Waste Disposal Ordinance. The Code of Practice on the
Packaging, Labelling and Storage of Chemical Wastes published under the Waste
Disposal Ordinance details the requirements to deal with chemical wastes.
General requirements are given as follows:
·
Suitable
containers should be used to hold the chemical wastes to avoid leakage or
spillage during storage, handling and transport.
·
Chemical
waste containers should be suitably labelled, to notify and warn the personnel
who are handling the wastes, to avoid accidents.
·
Storage
area should be selected at a safe location on site and adequate space should be
allocated to the storage area.
5.1It 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
activities 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;
·regular
cleaning and maintenance programme for drainage systems, sumps and oil
interceptors;
·a Waste
Management Plan should be prepared and submitted to the Engineer for
approval. One may make reference
to ETWB TCW No.15/2003 for details; and
·a recording system for the amount of wastes
generated, recycled and disposed (including the disposal sites) should be
proposed.
5.1In order
to monitor the disposal of C&D material at public filling areas and to
control fly tipping, a trip-ticket system should be included as one of the
contractual requirements to be implemented by an Environmental Team undertaking
the Environmental Monitoring and Audit work. One may make reference to WBTC No. 21/2002 for details.
Waste
Reduction Measures
5.1Good 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 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;
·separate
labelled bins shall be provided to segregate aluminium cans from other general
refuse generated by the work force, and to encourage collection of by
individual collectors;
·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;
·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.
5.1In
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.
5.1In order
to minimise the impact resulting from collection and transportation of C&D
material for off-site disposal, the excavated soft spoil from open trench
excavation at Pui O should be reused on-site as backfill material as far as
practicable. 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
·minimizing
land intake of stockpile areas as far as possible.
5.1If
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. 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 licenced facility, in accordance with the Waste Disposal
(Chemical Waste) (General) Regulation. No chemical waste should be allowed to
be stored within the site of the waterworks installations including the Siu Ho
Wan WTW, and the Pui O Raw Water
Pumping Station and Pui O No.2 Raw Water Pumping
Stations. All chemical wastes should be removed
from the waterworks installations at the first instance.
5.1General
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.