12.1.1
This section provides a summary of the requirements of the
environmental monitoring and audit (EM&A) for the upgrading of the Cheung
Chau STW and Pak She SPS (DP component) and the sewers works (non-DP component)
based on the findings of this EIA study.
12.1.2
The objectives of conducting the EM&A programme for the Project are
as follows:
Ÿ
To provide a database against which any short or
long-term environmental impacts of the Project can be determined;
Ÿ
To provide an early indication should any of the
environmental control measures or practices fail to achieve the acceptable
standards;
Ÿ
To monitor the performance of the Project and
the effectiveness of mitigation measures;
Ÿ
To verify the environmental impacts predicted in
this EIA;
Ÿ
To determine project compliance with regulatory
requirements, standards and government policies;
Ÿ
To take remedial action if unexpected problems
or unacceptable impacts arise; and
Ÿ
To provide data to enable an environmental audit.
12.1.3
The following section summarizes the recommended EM&A requirements
for the Project. Details of the specific
requirements for the upgrading of the Cheung Chau STW and Pak She SPS (DP
component of the Project) and the sewers works (non-DP component of the
Project) are provided in the EM&A Manual prepared in accordance with Annex
21 of the EIAO-TM.
Construction Phase
12.2.1
The predicted TSP results show that exceedance of recommended TSP
levels would occur if no mitigation measures are undertaken. Mitigation Measures are therefore needed to
reduce the dust impact to an acceptable level.
With the implementation of the dust suppression measures stipulated in
the Air Pollution Control (Construction Dust) Regulation and good site
practices, no adverse construction dust impacts would be expected. Nevertheless, it is recommended that
environmental monitoring and audit (EM&A) for air quality be carried out
during the construction period to ensure proper implementation of construction
phase mitigation measures with consideration of practicability in local level.
12.2.2
Further details of the specific EM&A requirements of the Project
are detailed in the EM&A Manual, together with event action plans and
procedures for complaints.
Operational Phase
12.2.3
All the odorous gas arising from the sewage would be collected and
properly treated by deodorization unit with 99% odour removal efficiency for
Cheung Chau STW and Pak She SPS. The predicted odour levels at the ASRs
would comply with the EIAO-TM criterion.
Odour
monitoring and audit should be carried out during the commissioning stage to
ensure the continuing effectiveness of the odour control measures. Details of monitoring and audit programme
of odour
due to the operation of Cheung Chau STW and Pak She SPS are presented
in the EM&A Manual. Commissioning test of the
deodorization unit is also a mandatory requirement to confirm the effectiveness
of the odour removal efficiency is in compliance with the design criteria.
Construction Phase
12.3.1
With the adoption of appropriate noise
mitigation measures, construction noise levels caused by construction works of
the upgraded Cheung
Chau STW and Pak She SPS at all representative NSRs would comply with
the EIAO-TM daytime noise criteria of 75 dB(A). It was envisaged that there
would be no adverse residual impact at the NSRs. Nonetheless, it is recommended
that environmental monitoring and audit (EM&A) for construction noise be
carried out throughout the construction period of the upgrading of Cheung Chau STW and Pak She
SPS to ensure proper implementation of construction phase mitigation
measures with consideration of practicability in local levels.
12.3.2
Residual impacts during the construction of the sewers works were
predicted. As such, it is recommended that construction phase EM&A is also
undertaken for the sewers works to minimize the impacts as far as practicable.
It is noted that during the construction process, episodes of high noise levels
may occur and it will be the function of the EM&A process to identify these
events and take the necessary action such as, for example, temporarily
adjustment of the number of plant to be used or an equivalent measure as
necessary. Further details of the specific EM&A requirements are detailed in
the EM&A Manual.
Operational Phase
12.3.3
Operational noise impacts from fixed plant of
the Cheung Chau STW and Pak She SPS can be effectively mitigated by
implementing noise control treatment at source. Adverse operation noise impacts
are not anticipated. EM&A during operational phase is not required. In
order to ensure compliance of the operational airborne noise impacts with the
relevant noise standards, the requirement for carrying out a noise
commissioning test for all major fixed noise sources should be included in the
tender document.
Construction Phase
12.4.1
With effective controls through good operation
and management practices, no adverse water quality impact is anticipated to
occur during the construction phase of both the upgrading works for the Cheung
Chau STW and Pak She SPS and the sewers works of the Project.
Operational Phase
12.4.2
For the operational phase, water quality in the
study area is expected to be in compliance with the WQOs under the normal
operation of the upgraded Cheung Chau STW (Scenario 2) with the exception for
TIN, based on the modelling and analysis results. Given that the background TIN
level in the Southern WCZ is already higher the WQO for TIN, the upgraded
Cheung Chau STW was not predicted to impose additional adverse impacts to water
quality conditions of the receiving marine environment.
Construction
Phase
12.5.1
The assessment has concluded that proper
handling, storage, collection, transportation and disposal of waste materials
generated during construction and operation of the Project will not give rise
to any significant impacts to nearby sensitive receivers.
12.5.2
It is recommended that during the construction
phase, site inspections and supervisions of waste management procedures and
auditing of the effectiveness of implemented mitigation measures should be
undertaken on a regular basis (e.g. weekly as a minimum). These tasks shall be
scheduled in the WMP to be prepared by the Contractor, and a summary of the
site audit findings shall be presented in the EM&A reports.
Operational Phase
12.5.3
No EM&A requirement is considered necessary
during the operational phase.
Construction Phase
12.6.1
The land contamination assessment was
undertaken by reviewing historical and current land uses and site
reconnaissance. Based on the findings of
the site appraisal, there were potential contaminated sites in the vicinity of
the proposed upgrading works at the Pak She SPS. However, as there are no excavation works in
the potential contaminated sites, no potential contaminated soils would be
disturbed. The impacts of land
contamination are not expected during the construction phase of the
Project. There are no EM&A
requirements for land contamination.
Operational Phase
12.6.2
The operation of the Project is not potential
contaminated land use. No operational contamination impacts are
anticipated. There are no EM&A
requirements for land contamination.
Construction Phase
12.7.1
Given the limited sizes of the works areas, the
ecological value of the habitats affected by the works areas is limited, no
specific ecological monitoring is required during construction phase.
Operational Phase
12.7.2
No adverse ecological impacts would be expected as a result of the
implementation of the Project during operational phase. Thus, no specific EM&A programme during
the operational phase is required.
Construction Phase
12.8.1
Since no unacceptable impact on fishing resources is identified, no
specific fisheries EM&A programme would be required during the construction
phase of the Project.
Operational Phase
12.8.2
No adverse fisheries impacts would be expected as a result of the
implementation of the Project during operational phase. Thus, no specific EM&A programme with
respect to fisheries during the operational phase is required.
Built Heritage
12.9.1
No adverse impacts on any built heritage resources would be expected
from the works of upgrading of Cheung Chau STW and Pak She SPS. No specific EM&A programme for the
upgrading of Cheung Chau STW and Pak She SPS is required.
12.9.2
The construction of sewers works may have potential indirect impacts to
the built heritage resources. Monitoring and preventive measures for the sewers
works will be recommended as detailed in the EM&A Manual. The recommended measures are described as
follow:
Condition Survey
12.9.3
The requirements for condition survey have been highlighted in Sections
10.4.32
and 10.4.33. A condition survey will be
required for all highlighted Graded Historic Buildings and Non-Graded heritage
structures as shown in Table 10.3 and Table 10.4 respectively.
Vibration Monitoring
12.9.4
The requirements for vibration monitoring have been highlighted in Section 10.4.34. The condition survey report will confirm the
Graded Historic Buildings and Non-Graded heritage structures that will require
vibration monitoring during the construction works.
Provision of Buffer Zone
12.9.5
The requirements for provision of buffer zone have been highlighted in Section 10.4.35. Resources requiring buffer zone are shown in Table 10.3 and Table 10.4.
Protective Covering
12.9.6
The requirements for protective covering have been highlighted in Section 10.4.36. Resources requiring
protective covering are shown in Table 10.3 and Table 10.4.
Safe Public Access
12.9.7
The requirements for safe public access have been highlighted in Section 10.4.37. Resources requiring safe
public access are shown in Table 10.3 and Table 10.4.
Archaeology
12.9.8
No archaeological potential will be affected by the upgrading of Cheung
Chau STW and Pak She SPS.
12.9.9
For the construction of sewers works, Archaeological Watching Brief
programme and provision of buffer zone will be recommended as detailed in the
EM&A Manual.
Archaeological Watching Brief Programme
12.9.10
Archaeological Watching Brief programme at Tai San Street, Tai San Back
Street, Chung Hing Street and Chung Hing Back Street, Ko Shan Tsuen and Tung
Wan Road. Archaeological Watching Brief
should be undertaken by a qualified archaeologist, who must apply for a licence
under the Antiquities and Monuments Ordinance (Cap. 53) from the Antiquity
Authority before the commencement of archaeological fieldwork.
12.9.11
Should significant findings be identified, additional archaeological
resources should be provided in the form of additional or extended visits to
ensure that appropriate recording and retrieval is accomplished prior to the
continuation of engineering groundworks.
Upon discovery of any artefact or archaeological feature in the course
of other excavation works during the construction stage, the AMO will be
notified immediately for site inspection, on site discussion with the AMO will
be arranged to agree on further actions required.
Provision of Buffer Zone
12.9.12
A buffer zone should be provided to ensure that the declared monument
and its environs are not infringed upon during the construction works. In
order to better protect the Rock Carving and its environs a buffer zone is
required which includes Hak Pai Road and the nearby open space. Within the
buffer zone, construction works as well as storage of construction materials
are not allowed. Erection of temporary fencing/barriers to demarcate the buffer
zone is not required. In addition, access to the rock carving should be
maintained and directional signage should be erected or installed at
appropriate location(s) near the rock carving to facilitate visitors to access
the rock carving during the construction phase.
12.9.13
In addition, periodic monitoring of the declared monument is
recommended. It is recommended to
conduct inspection of the site every 3 months during the construction
phase. Inspection record supplemented
with the site photos showing the condition of the overall declared monument
should be submitted to AMO for record purposes.
Operational Phase
12.9.14
No adverse impacts on any cultural heritage resources would be expected
as a result of the implementation of the Project during operational phase. Thus, no specific EM&A programme with
respect to cultural heritage during the operational phase is required.
Construction Phase
12.10.1
During the construction phase of the Project, some of the existing
trees and vegetation would be disturbed.
A number of on-site landscape mitigation measures are recommended to
minimise the potential landscape and visual impacts. With the implementation of
the recommended mitigation measures, the landscape and visual impacts are
considered to be negligible.
12.10.2
Regular audits should be carried out to ensure all the recommended
landscape and visual mitigation measures would be effectively implemented and
audited by the Environment Team during construction phases of the Project. The EM&A will comprise audit of the tree
transplanting, compensatory planting and planting establishment through site
audit programme.
Operational Phase
12.10.3
Operational stage EM&A during the operational phase will comprise
audit of the implementation of the landscape plan in the form of site
inspection.