5.
Noise
5.1
Introduction
Environs
5.2.1
The Project site is located within the
existing Sha Tin WTW. It is surrounded
by the slope of Kam Shan and Lion Rock from north to south, and immediately to the
east of the Project site is the existing MTR East Rail Line. Further to the northeast and east of the
Project site is a mixture of residential uses, commercial uses, recreational
area and educational institutes. The
existing noise climate of the study area is dominated by the railway noise from
the existing East Rail Line. Traffic
noise arising from Che Kung Miu Road and Hin Keng Street are another major
noise sources in the vicinity.
5.2.2
To investigate the prevailing noise levels of
the study area, noise measurements were taken on 26 to 27 September 2011. The measurements were conducted in accordance
with the calibration and measurement procedures stated in the IND-TM. The measured prevailing background noise
levels are presented in Appendix
5.1.
Noise Sensitive Receivers
5.2.3
In accordance with
Annex 13 of the EIAO-TM, all domestic premises including temporary housing,
education institutions including kindergarten and nurseries, hospital, medical
clinics, home for aged, convalescent homes, places of public worship,
libraries, courts of law, performing arts centres, auditoria, amphitheatres,
hostels and country parks are considered as NSRs. As stated in the
EIA Study Brief, the boundary of the assessment area for noise impact
assessment should be 300 m from the Project boundary. A total of 8 representative NSRs, which are
considered to be most likely to be affected by the construction of the Project,
have been identified for this assessment.
Details of the
representative NSRs are shown in Table 5.1 and their locations are
illustrated in Figure 5.1.
Table 5.1 Details of Representative Noise
Sensitive Receivers (NSRs)
|
NSRs
|
Description
|
Land Use
|
Distance from the
nearest Project Boundary (m)
|
No. of Storey
|
|
HK1
|
The L Louey (East)
|
Residential
|
25
|
2
|
|
HK2
|
The L Louey (South)
|
Residential
|
25
|
2
|
|
HK3
|
Hin Keng Estate - Hin Yau House (North)
|
Residential
|
95
|
35
|
|
HK4
|
Hin Keng Estate - Hin Yau House (South)
|
Residential
|
95
|
35
|
|
HK5
|
Hin Keng Estate - Hin Wan House
|
Residential
|
115
|
35
|
|
HK6
|
Hin Keng Estate - Hin Kwai House
|
Residential
|
145
|
35
|
|
HK7
|
C.U.H.K.F.A.A. Thomas
Cheung School
|
Educational Institutions
|
215
|
6
|
|
HK8*
|
Sha Tin WTW Staff
Quarters[1]
|
Residential
|
- [2]
|
1-3
|
Note:
[1]All the Sha Tin WTW Staff Quarters would be used as site office
during the construction of the project. It is only considered as representative
noise sensitive receivers during operational phase.
[2]Located within the Project area
5.3
Environmental Legislation, Plans, Standards,
and Guidelines
·
Technical
Memorandum on Noise from Places other than Domestic Premises, Public Places or
Construction Sites (IND-TM);
·
Technical
Memorandum on Noise from Construction Work in Designated Areas (DA-TM);
·
Technical
Memorandum on Noise from Construction Work other than Percussive Piling
(GW-TM); and
·
Technical
Memorandum on Noise from Percussive Piling (PP-TM).
5.3.3
The NCO and the accompanying Technical
Memoranda provide a mechanism for assessing noise levels and provides the
statutory power to control noise.
5.3.4
With regard to the assessments of the
operation noise impact, the NCO designates acceptable noise levels for NSRs on
the basis of an Area Sensitivity Rating (ASR), based on the characteristics of
the area where they are located such as rural, village, low-density
residential, or urban (see Table 5.2). Within these areas, the presence of
“influencing factors” (such as the presence of industrial activities or major
roads) can further affect the ASR and hence the acceptable noise level.
Table
5.2 Area
Sensitivity Ratings (ASRs)
|
Type of Area Containing NSR
|
Degree to which NSR is affected by IF
|
|
Not Affected
|
Indirectly Affected
|
Directly Affected
|
|
Urban Area
|
B
|
C
|
C
|
|
Low density residential area
consisting of low-rise or isolated high-rise developments
|
A
|
B
|
C
|
|
Rural Area
|
A
|
B
|
B
|
|
Area other than those above
|
B
|
B
|
C
|
5.3.5
Referring to the indicative construction programme
(Appendix
2.1), the construction
works would be conducted between 0800 and 1800.
Under the GW-TM, noise from construction activity is not restricted
between 0700 and 1900 hours on weekdays, except Public Holidays. However, the EIAO-TM identifies a daytime
general construction noise limit of 75 dB(A) for domestic premises and 70 dB(A)
for educational institutions during normal teaching periods, whereas 65 dB(A)
during examination periods. These noise
standards were used as the assessment criteria in the construction noise
assessment.
Operation Noise
5.3.6
Fixed noise sources associated with the
Project would be controlled by the NCO and IND-TM. The Acceptable Noise Levels (ANL) is a
function of the type of area within which the NSRs are located, and the degree
of the effect on the NSRs of influencing factors such as major roads and
industrial areas. According to the
IND-TM, the ANLs for different ASRs are given in Table 5.3.
Table
5.3 Acceptable Noise Levels for Fixed Noise Sources
|
Time Period
|
Acceptable
Noise Level, dB(A)
|
|
ASR
A
|
ASR
B
|
ASR
C
|
|
Daytime
and Evening (0700 to 2300 hours)
|
60
|
65
|
70
|
|
Night
(2300 to 0700 hours)
|
50
|
55
|
60
|
5.3.7
All identified representative NSRs are
located in areas other than rural areas, low density residential area and urban
area, and they are not affected by influencing factors. With reference to Table 5.2 above, ASR of “B” has been assumed for the NSRs in the
vicinity of the proposed Project site. As
Sha Tin WTW is operating 24-hour a day, ANL for night time with lower
acceptable noise levels is adopted as the noise criteria for fixed noise
sources for residential NSRs. Whereas
for school, the ANL for daytime and evening period is adopted in view of the
normal opening hours of school. The
EIAO-TM recommends that the level of the intruding noise at the façade of the
nearest sensitive use should be at least 5 dB(A) below the appropriate ANL or,
in the case of background noise being 5 dB(A) lower than the ANL, the predicted
noise level arising from the operation of the proposed Project at the façade of
the nearest sensitive use should not exceed the background noise level. In this regard, noise measurement was
undertaken in the vicinity of the representative NSRs to study the prevailing
noise level (see Appendix 5.1). The assessment criteria for the proposed
fixed noise sources, as adopted in this EIA Study are presented in Table 5.4. However, the noise criteria for cumulative
noise impacts arising from all items of equipment including new equipment and
existing equipment would follow the relevant ANL criteria.
Table
5.4 Noise Criteria for Fixed Noise Sources
|
NSR
|
Description
|
ANL(1),
dB(A)
|
Planning
Criteria
(ANL-5dB(A))
|
Minimum
Measured Noise Level,
dB(A)
|
Criteria for Proposed Fixed Plant, dB(A)
|
Criteria for Cumulative Impact, dB(A)
|
|
HK1
|
The L Louey (East)
|
55
|
50
|
52
|
50
|
55
|
|
HK2
|
The L Louey (South)
|
55
|
50
|
52
|
50
|
55
|
|
HK3
|
Hin Keng Estate -
Hin Yau House (North)
|
55
|
50
|
58
|
50
|
55
|
|
HK4
|
Hin Keng Estate -
Hin Yau House (South)
|
55
|
50
|
58
|
50
|
55
|
|
HK5
|
Hin Keng Estate
Hin Wan House
|
55
|
50
|
58
|
50
|
55
|
|
HK6
|
Hin Keng Estate
Hin Kwai House
|
55
|
50
|
57
|
50
|
55
|
|
HK7
|
C.U.H.K.F.A.A.
Thomas Cheung School
|
65
|
60(2)
|
59
|
59(2)
|
65
|
|
HK8
|
Sha Tin WTW
Staff Quarters
|
55
|
50
|
57
|
50
|
55
|
Notes:
1.
ASR
of “B” has been assumed for the NSRs;
2.
The
criteria is recommended for the time period of daytime and evening time, as school
is not considered as a night-time NSR.
5.3.8
In any event, the Area Sensitivity Rating
assumed in the EIA Report is for indicative assessment only. It should be noted that the fixed noise
sources are controlled under Section 13 of the NCO. At the time of investigation, the Noise
Control Authority shall determine noise impact from concerned fixed noise
sources on the basis of prevailing legislation and practices being in force and
taking account of contemporary conditions/situations of adjoining land
uses. Nothing in the EIA Report shall
bind the Noise Control Authority in the context of law enforcement against all
the fixed noise sources being assessed.
5.4
Identification of Environmental Impacts
5.4.2
Generally, the construction activities of the
Project would be carried out in non-restricted hours (0700-1900 hours) during
normal working days. For any
construction activities that need to be carried out during restricted hours, it
is the Contractor’s responsibility to ensure compliance with the NCO and the
relevant TMs. The Contractor will be
required to submit construction noise permit (CNP) application to the Noise
Control Authority and abide by any conditions stated in the CNP, should one be
issued.
Operation
Phase
5.4.3
According to the design information, the
major fixed plant noise sources are identified as the new mixers, ventilation
fans, blowers, cooling tower and pump gallery.
Cumulative
Noise Impact from the Other Concurrent Project
5.4.4
Based on the current programme, the Project
would likely to have interactions with Shatin to Central Link – Tai Wai to Hung
Hom Section [SCL(TAW-HUH)]. SCL(TAW-HUH)
is an extension of Ma On Shan Line from Tai Wai Station via Hin Keng passing
through Lion Rock to the east Kowloon.
The construction works of SCL(TAW-HUH) at Hin Keng are located just next
to the Project site. The fixed plant proposed
by SCL(TAW-HUH) are also located within 300 m from the Project. Potential cumulative noise impacts would be
expected from the construction and operation of SCL(TAW-HUH) in Tai Wai area.
5.5.1 According to the current construction programme for the Project, the
demolition and construction works are scheduled to be conducted in sequence.
Some of the construction tasks would be carried out concurrently. Construction
noise level was calculated for each month during the construction phase. All of
the construction tasks within the Project area are taken into consideration for
the calculation, construction activities from concurrent project within 300 m
of a given NSR are also considered in the cumulative construction noise
calculation.
5.5.2
In accordance with the EIAO-TM, the
methodology outlined in the GW-TM was used for the demolition/construction
noise assessment. The general approach
is summarized below:
·
Locate
the NSRs which would most likely be affected by noise from the
demolition/construction works;
·
Determine
the items of PME for each discrete construction activity, based on available
information or agreed plant inventories;
·
Assign
sound power levels (SWLs) to the proposed PME according to the GW-TM or other
sources;
·
Calculate
distance attenuation and screening effects to NSRs from notional noise source;
·
Predicted
construction noise levels at NSRs in the absence of any mitigation measures;
·
Include
a 3 dB(A) façade correction to the predicted noise levels in order to account
for the façade effect at each NSR.
5.5.3
Sound power levels of the equipment were
taken from Table 3 of GW-TM. Where no
sound power level was given in the GW-TM, reference was made to British
Standard 5228: Part 1:2009 Noise Control on Construction and Open Sites
or previous similar studies. Groups of
PME were assigned for various construction activities of the Project. The proposed plant inventory for the
demolition/construction works of the Project is presented in Appendix
5.2. Appropriate on-time percentage for all items
of PME was reasonably assumed as presented in Appendix
5.2. The Project Proponent has confirmed the
proposed plant inventories as being practical and adequate for completing the
works within the scheduled timeframe.
5.5.4
The assessment was undertaken based on the
assumption that all items of construction equipment are located at a notional
noise source point for each phase of works and that all items of equipment are
operating simultaneously.
Operation
Phase
5.5.5
For the assessment of noise from fixed plant,
the maximum permissible sound power levels (Max. SWLs) of the identified fixed
noise sources have been determined by adopting standard acoustic
principles. The following formula has
been used for calculating the maximum SWLs of the fixed plant.
SPL
= Max SWL – DC + FC – BC
Where,
SPL Sound
Pressure Level, in dB(A)
Max. SWL Maximum
Permissible Sound Power Level, in dB(A)
DC Distance
Attenuation, in dB(A) (i.e. 20logD + 8 [where D is the distance in metres])
FC Façade
Correction, in dB(A) (i.e. 3 dB(A))
BC Barrier
Correction, in dB(A)
5.5.6
It was assumed that all the fixed plant
within the same location would be operated simultaneously for the worst-case
scenario. Screening correction offered
by buildings or other structures such as office and residential buildings has
been taken into account in calculating the predicted noise levels. According to the GW-TM, effective barriers
can result in noise reduction of 5 to 10 dB(A) for the fixed plant depending on
the line of sight of the representative NSRs.
A positive 3 dB(A) has been added to the predicted noise levels at the
NSRs due to the façade effect.
5.5.7
Corrections of tonality, intermittency or
impulsiveness have not been included owing to the lack of design/supplier
information at this stage. If the noise exhibits any of these characteristics
during detailed design or operation of the plant, the noise limit of the plant
should be reduced in accordance with the recommendation given in IND-TM.
5.5.8
In addition to the newly proposed equipment,
the existing equipment for the North Works of Sha Tin WTW will be retained and
continue to operate. The sound power
level of the existing equipment for the North Works of Sha Tin WTW was estimated
based on on-site free-field measurement. The details of the on-site noise
measurement are given in Appendix 5.3. The noise measurement results and estimated
sound power level are presented in Appendix
5.4.
5.6
Prediction and Evaluation of Environmental Impacts
Construction
Noise
Unmitigated
Construction Noise Impacts
5.6.1
For normal daytime working hours, exceedances
of the construction noise criteria would be predicted at representative NSRs in
the absence of mitigation measures.
Details of construction noise calculations and results are presented in Appendix 5.5.
A summary of the calculated noise
results is shown in Table 5.5.
Table
5.5 Unmitigated Construction Noise Levels due
to the Project at Representative NSRs During Normal Daytime Working Hours
|
NSRs
|
Description
|
Predicted Unmitigated
Construction Noise Level, dB(A)
|
|
HK1
|
The L Louey (East)
|
55-76
|
|
HK2
|
The L Louey (South)
|
56-77
|
|
HK3
|
Hin Keng Estate - Hin Yau House (North)
|
51-74
|
|
HK4
|
Hin Keng Estate - Hin Yau House (South)
|
51-77
|
|
HK5
|
Hin Keng Estate - Hin Wan House
|
51-78
|
|
HK6
|
Hin Keng Estate - Hin Kwai House
|
49-77
|
|
HK7*
|
C.U.H.K.F.A.A. Thomas Cheung School
|
46-72
|
5.6.2
The above results showed that the predicted
noise levels at the representative NSRs are in the range of 46
to 78 dB(A).
Exceedances in the range of 1 to 3
dB(A) were predicted at some NSRs. Noise
mitigation measures would therefore be required to reduce noise levels to the
stipulated noise standards.
Recommended Mitigation Measures for Construction Noise
5.6.3
In order to reduce the excessive noise
impacts at the affected NSRs, the following mitigation measures have been
considered:
·
Good
site practice;
·
Use
of quiet PME;
and
·
Adoption
of movable noise barriers.
Good Site Practice
5.6.4
Although the noise mitigation effects are not
easily quantifiable and the benefits may vary with site conditions and
operating conditions, good site practices are easy to implement and do not
impact upon the works schedule. The site
practices listed below should be followed during each phase of construction:
·
Only
well-maintained plant should be operated on-site and plant should be serviced
regularly during the construction program;
·
Silencers
or mufflers on construction equipment should be utilized and should be properly
maintained during the construction phase;
·
Mobile
plant, if any, should be sited as far from NSRs as possible;
·
Machines
and plant (such as trucks) that may be in intermittent use should be shut down
between work periods or should be throttled down to a minimum;
·
Plant
known to emit noise strongly in one direction should, wherever possible, be
orientated so that the noise is directed away from the nearby NSRs;
·
Material
stockpiles and other structures should be effectively utilized, wherever
practicable, in screening noise from on-site construction activities.
Adoption of Quiet PME
5.6.5
In order to reduce the excessive noise
impacts at the affected NSRs during normal daytime working hours, quieter PME
are recommended. The Contractor may use
other types of quiet plant instead of specific items of quiet plant adopted in
this assessment, which have the same total SWL, to meet their needs. Quiet PME adopted in the assessment were
taken from the BS5228: Part 1:2009 or the noise specification of the plant
provided from the supplier, and the PME are known to be available in Hong
Kong. Quiet PME that have been adopted
in the assessment are summarised in Table
5.6 and the proposed mitigated plant inventory for the
demolition/construction works of the Project is detailed in Appendix 5.6.
Table 5.6 Quiet PME Recommended for Adoption during Construction
Phase
|
PME
|
Reference
|
SWL, dB(A)
|
|
Bulldozer
|
BS C5/14
|
114
|
|
Diesel Generator
|
BS C4/85
|
94
|
|
Dump Truck
|
BS C2/30
|
107
|
|
Excavator
|
BS C1/12
|
110
|
|
Excavator
|
BS C2/14
|
107
|
|
Excavator
|
BS C4/17
|
99
|
|
Excavator
|
BS C1/4
|
104
|
|
Mobile Crane
|
BS C4/43
|
98
|
|
Piling Machine
|
BS C3/14
|
111
|
|
Poker Vibrator
|
BS C4/33
|
106
|
|
Road Roller
|
BS C2/37
|
107
|
|
Silent Piler
|
Giken-001(1)
|
86
|
|
Water Pump
|
BS C4/88
|
96
|
Note:
(1)
The noise
specification of the Silent Piler is provided by the supplier, Giken Seisakusho
Asia PTE., LTD.
Use of Movable Noise Barrier
5.6.6
The use of movable noise barrier for certain
PME could further alleviate the construction noise impacts. In general, 5 dB(A) reduction for movable PME
and 10 dB(A) for stationary PME can be achieved depending on the actual design
of movable noise barrier. The Contractor
shall be responsible for design of the movable noise barrier with due consideration
given to the size of the PME and the requirement of intercepting the line of
sight between the NSRs and PME. Barrier
material of surface mass in excess of 14 kg/m2 is recommended to
achieve the predicted screening effect.
Mitigated Construction Noise Impacts
5.6.7
The predicted mitigated construction noise
levels are detailed in Appendix 5.7 and summarized in Table 5.7 below. As shown in Appendix 5.7, with the
implementation of all the above-mentioned mitigation measures, the predicted
construction noise levels due to the Project itself at representative NSRs would
be reduced by up to 10 dB(A). The predicted construction noise levels due
to the Project itself at all representative NSRs, ranging from 46-72
dB(A), would comply with the EIAO-TM noise criteria.
5.6.8
In terms of the cumulative impacts with
SCL(TAW-HUH), exceedance of 1 dB(A)
during examination periods would be predicted at C.U.H.K.F.A.A. Thomas Cheung
School (HK7). The exceedance is solely due to the concurrent construction works of SCL(TAW-HUH), as no overall increase in cumulative noise level due to the Project is
predicted at the NSR. Further
discussion on residual impacts is presented in Section 5.7 below.
Table 5.7 Cumulative Mitigated Construction Noise Levels at
Representative NSRs During Normal Daytime Working Hours
|
NSRs
|
Description
|
Predicted Noise Level,
dB(A)
|
|
The Project
|
SCL(TAW-HUH)
|
Cumulative
|
|
HK1
|
The L Louey (East)
|
54-72
|
51-64
|
54-72
|
|
HK2
|
The L Louey (South)
|
56-71
|
51-64
|
57-71
|
|
HK3
|
Hin Keng Estate - Hin Yau House (North)
|
51-68
|
53-66
|
53-68
|
|
HK4
|
Hin Keng Estate - Hin Yau House (South)
|
51-68
|
53-66
|
57-68
|
|
HK5
|
Hin Keng Estate - Hin Wan House
|
51-68
|
68-75
|
57-75
|
|
HK6
|
Hin Keng Estate - Hin Kwai House
|
49-67
|
64-75
|
55-75
|
|
HK7*
|
C.U.H.K.F.A.A. Thomas Cheung School
|
46-64
|
54-66
|
54-66
|
Fixed Plant
Noise
5.6.9
Based on the calculated maximum allowable sound
power levels for the new equipments and the estimated sound power levels for
the existing equipment, the predicted fixed plant noise levels at the
representative NSRs are summarised in Table
5.8. Details of the calculations are
presented in Appendix 5.8. If there is any change in engineering design
information during detailed design stage or fitting-out stage, the fixed source
noise design should be reviewed by the Engineer/Contractor to ensure that both
the NCO and EIAO-TM criteria at the NSRs can be met in the future.
Table 5.8 Predicted Fixed Plant Noise Levels at Representative NSRs
|
NSRs
|
Description
|
Predicted Noise Level,
dB(A)
|
|
Existing Equipment
|
New Equipment
|
SCL(TAW-HUH)
|
Cumulative
|
|
HK1
|
The L Louey (East)
|
40
|
36
|
38
|
43
|
|
HK2
|
The L Louey (South)
|
49
|
45
|
37
|
51
|
|
HK3
|
Hin Keng Estate - Hin Yau House (North)
|
45
|
35
|
48
|
50
|
|
HK4
|
Hin Keng Estate - Hin Yau House (South)
|
47
|
46
|
39
|
50
|
|
HK5
|
Hin Keng Estate - Hin Wan House
|
47
|
47
|
35
|
50
|
|
HK6
|
Hin Keng Estate - Hin Kwai House
|
45
|
46
|
27
|
48
|
|
HK7*
|
C.U.H.K.F.A.A. Thomas Cheung School
|
42
|
43
|
33
|
46
|
|
HK8
|
Sha Tin WTW Staff Quarters
|
46
|
50
|
30
|
52
|
Notes:
(a)
Noise Criteria for domestic premises: 50
dB(A) for new equipment and 55 dB(A) for cumulative noise impact; whereas noise
criteria for educational institutes: 60 dB(A) for new equipment and 65 dB(A)
for cumulative noise impact.
(b)
NSR with asterisk means education
institution.
5.6.10
It should be noted that the fixed plant noise
assessment is based on the worst-case scenario in which all items of equipment
were assumed to operate simultaneously during operation period.
Recommended Mitigation Measures for Fixed Plant Noise
5.6.11
Provided that the fixed plant is properly
designed to meet the maximum allowable SWLs, therefore, no adverse residual
impacts would be predicted. However, it
is still recommended that the following noise reduction measures be considered
as far as practicable during the processes of detailed design and procurement:
·
Choose
quieter plant such as those which have been effectively silenced;
·
Include
noise levels specification when ordering new plant (including chillier and E/M
equipment);
·
Locate
fixed plant/louver away from any NSRs as far as practicable;
·
Locate
fixed plant in walled plant rooms or in specially designed enclosures;
·
Locate
noisy machines in a basement or a completely separate building;
·
Install
direct noise mitigation measures including silencers, acoustic louvers and acoustic
enclosure where necessary; and
·
Develop
and implement a regularly scheduled plant maintenance programme so that
equipment is properly operated and serviced in order to maintain a
controlled
level of noise. The programme should be
implemented by properly trained personnel.
Construction
Noise
5.7.1
With the implementation of the recommended
noise mitigation measures, the predicted noise levels due to the construction
of the Project itself would comply with the EIAO-TM normal daytime
criteria. Residual construction noise
impact of 1 dB(A) for only 1 month during the examination period would be expected at C.U.H.K.F.A.A. Thomas Cheung School. The exceedance is
solely due to the concurrent construction works of SCL(TAW-HUH), while no overall increase of cumulative noise level due to the Project
is predicted at the NSR. MTR would
be liaised during construction stage to reduce cumulative impact with the
construction of SCL – Tai Wai to Hung Hom Section.
Fixed
Plant Noise
5.7.2
No adverse impact on residual fixed plant
noise impacts due to the operation of the Project is expected.
5.8
EM&A Requirements
5.8.1
An Environmental Monitoring and Audit
programme is recommended to be established according to the predicted
occurrence of noisy activities. The recommended mitigation measures should be
implemented during construction stage.
Details of the programme are provided in a stand-alone EM&A Manual.
5.8.2
With the implementation of the recommended
noise mitigation measures, no adverse impact is expected due to the operation
of the fixed plant equipments based on a set of
specified maximum SWLs for newly proposed fixed plant as shown in Appendix 5.8. Operation noise monitoring is therefore considered
not necessary.
5.9
Conclusion
Construction
Noise
5.9.1
This assessment has presented the
construction noise impacts of the Project during normal daytime working hours. The predicted unmitigated noise levels at
representative NSRs would range from 46 to 78
dB(A). With the adoption of quiet PME
and use of movable noise barrier, the noise levels due to the Project itself at
all representative NSRs would comply with the EIAO-TM criteria.
5.9.2
When considering the cumulative construction
noise impacts, exceedance of 1 dB(A)
during examination periods would be predicted at C.U.H.K.F.A.A. Thomas Cheung
School; however, the exceedances are only contributed by the concurrent
construction works of SCL(TAW-HUH) as the Project does not induce any impact
during that period. All practicable direct mitigation measures
have been exhaustively investigated and residual impact is minimised. The residual impacts are considered to be
temporary, reversible and unlikely to induce public health concern and as such,
are considered to be minor and acceptable.
Fixed
Plant Noise
5.9.3
The noise impact associated with the
operation of the Project has been assessed.
The predicted fixed plant noise levels at the representative NSRs would
be expected to comply with the day-time, evening time and night time criteria
based on the assessment using a set of specified maximum SWLs for the newly
proposed fixed plant. If there is any
change in engineering design information during detailed design stage or
fitting-out stage, the fixed source noise design should be reviewed by the
Engineer/Contractor to ensure that both the NCO and EIAO-TM criteria at NSR can
be met in the future.
~End of
Section 5 ~