3.1
Water
quality impact during operational phase will be minimized through
implementation of the recommended design and practices as outlined in ProPECC PN5/93
recommended in Sections 3.18 to 3.26. Water
quality audit requirements will therefore cover the construction phase only.
3.2
Waste management would be It is the contractor’s
responsibility to ensure that all wastewater or site runoffs 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.
3.1
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.
3.3
Implementation
of regular site audits is recommended to ensure that the recommended mitigation
measures are to be properly undertaken during construction phase of the
Project. It can also provide an effective control of any malpractices and
therefore achieve continual improvement of environmental performance on site.
3.4
Site
audits shall include site inspections and compliance audits.
3.5
Site
inspections shall be carried out by the ET and shall be based on the mitigation
measures for water pollution control recommended in Sections
3.10 to 3.157 below. In
the event that the recommended mitigation measures are not fully or properly
implemented, deficiency shall be recorded and reported to the site management.
Suitable actions are to be carried out to:
·
Investigate the problems and the causes.
·
Issue action notes to the Contractor who is
responsible for the works.
·
Implement remedial and corrective actions immediately.
·
Re-inspect the site conditions upon completion of the
remedial and corrective actions.
·
Record the event and discuss with the Contractor for
preventive actions.
3.6
Monitoring
of the quality of
effluent from the
Works Areas, if
any, is required
during the construction phase of the Project. The monitoring shall be carried
out at the pre-determined discharge point. Compliance audits are to be
undertaken to ensure that a valid discharge licence has been issued by EPD
prior to any discharge of effluent from
the Project site. The monitoring frequency and parameters specified in the
discharge licence shall be fully considered during the monitoring. All
monitoring requirements shall be approved by EPD. The audit results reflect
whether the effluent quality is in compliance with the discharge licence requirements.
In case of non-compliance, suitable actions shall be undertaken to:
·
Notify the site management for the non-compliance.
·
Identify the sources of pollution.
·
Check the implementation status of the recommended
mitigation measures.
·
Investigate the operating conditions of the on-site treatment
systems.
·
Implement corrective and remedial actions to improve the
effluent quality.
·
Increase monitoring frequency until the effluent quality is
in compliance with the discharge licence requirements.
·
Record the non-compliance and propose preventive
measures.
3.7
The
implementation schedule for the recommended water quality mitigation measures
is presented in Appendix A.
3.8
Mitigation
measures for water quality control have been recommended in the EIA
Report. The Contractor should be
responsible for the design and implementation of these measures.
3.9
Recommended
mitigation measures to minimise the adverse impacts on water quality during
construction and operation phases are detailed in
Sections 3.10 to 3.17 below.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.
3.10
The
practices outlined in ProPECC PN 1/94 Construction
Site Drainage
should be adopted where applicable, to minimise the potential water quality
impacts from construction site runoff and various construction activities.
3.11
There
is a need to apply to EPD for a discharge licence for discharging effluent from
the construction site, if any. The discharge quality is required to meet the
requirements specified in the discharge licence. Any wastewater generated from
the works areas should be treated so that it satisfies all the standards listed
in the Technical
Memorandum on Standards for Effluents Discharged into Drainage and Sewerage
Systems, Inland and Coastal Waters (TM-DSS).
3.12
Good
site practices should be adopted to collect the rubbish and litter on the
construction sites so as to prevent the rubbish and litter from spreading from
the site area. It is recommended
to clean the construction sites on a regular basis.
3.13
The
presence of construction workers generates sewage. The construction workers can make use of the existing toilet
facilities within the MFT, as necessary. If required, sufficient portable
chemical toilets should be provided in the works areas, and a licensed
collector should be deployed for appropriate disposal and maintenance of the
toilets on a regular basis.
3.14
Notices
should be posted at conspicuous locations to remind the workers not to
discharge any sewage or wastewater into the nearby environment during the
construction phase of the Project.
3.1
The
contractor must register as a chemical waste producer if chemical wastes would
be produced from the construction activities. 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.
3.15
Any
service shop and maintenance facilities should be located within a bunded area,
and sumps and oil interceptors should be provided. Maintenance of equipment
involving activities with potential for leakage and spillage should only be
undertaken within the areas appropriately equipped to control these discharges.
3.1Disposal
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.
3.16
For
handling, treatment and disposal of operational stage effluent, the practices
outlined in ProPECC PN 5/93 should be adopted where applicable. The following relevant recommendations
should be followed:
·
Drainage outlets provided in open areas and areas
subjected to a substantial amount of wind-blown rain should be connected to
storm drains.
·
Drainage outlets provided in covered areas,
including covered podiums and other roofed areas, should be discharged to foul
sewers.
·
Surface water drainage should be provided for
discharging storm water from open surfaces. Such drainage as normally collected in open surface channels
should be led to storm water drains via silt removal facilities. Runoff in channels of building
platforms should pass through a gully pit with necessary gratings to prevent
objects from entering the storm water drains.
Good Site
Practices
3.1Recommendations
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.
3.1General
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.
3.1If
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, 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
3.1It 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.
3.1In 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
3.1Good
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.
3.1In
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.
3.1In 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.
3.1If
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.
3.1General
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.