4.1.1.1
This section presents an assessment on
the potential noise impacts arising from the construction of the Project. The noise impact assessment is conducted in accordance with the
requirements of Annex 5 and Annex 13 of the Technical Memorandum on
Environmental Impact Assessment Process (EIAO -TM) as well as the requirements
set out under Clause 3.4.4 and Appendix B of the EIA Study Brief
(ESB-287/2015).
4.2.1
General
4.2.1.1
Construction noise impact has been
assessed in accordance with the criteria and methodology given in the Technical
Memoranda (TM) under the Noise Control Ordinance (NCO), and the Technical
Memorandum on Environmental Impact Assessment Process (EIAO-TM).
4.2.1.2
Assessment
procedures and standards are set out in the following TM:
·
Technical
Memorandum on the Environmental Impact Assessment Process (EIAO-TM); and
·
Technical
Memorandum on Noise from Construction Work other than Percussive Piling
(GW-TM).
4.2.2
Construction Noise
4.2.2.1
The
NCO provides the statutory framework for the control of noise from construction
works, other than percussive piling, using powered mechanical equipment (PME)
between the hours of 1900 and 0700 hours or at any time on Sundays and general
holidays (i.e. restricted hours). Noise
from construction activities taking place at other times is subject to the
Noise Standards for Daytime Construction Activities in Table 1B of Annex 5 of
the EIAO-TM. The criteria are summarized
in Table 4.1.
Table 4.1 Noise
Criteria for Daytime Construction Noise
|
Uses
|
Daytime Noise Criteria in Leq (30min), dB(A)
|
|
Domestic
premises
|
75
|
|
Educational
Institution
|
70
|
|
Educational
Institution (during examination)
|
65
|
Note: The above
standards apply to uses which rely on opened windows for ventilation.
4.2.3
Operation Noise
4.2.3.1
The
Project is not a noise pollution source and therefore noise impact arising from
the project during operation phase is not anticipated.
4.3.1.1
The
Project is located at the waterfront of Lei Yue Mun as shown in Figure 2.1.
The land uses in the Study Area, i.e. the area within a distance of 300m
from the boundary of the Project, are mainly residential uses and restaurants
in village houses and squatters. The existing noise climate is dominated by
noise from business activities and passing marine vessels.
4.4.1.1
In accordance with Annex 13 of the EIAO-TM, domestic premises including temporary housing,
educational institutions (including kindergartens and nurseries), hospitals,
medical clinics, homes for the aged, convalescent homes, places of worship,
libraries, courts of law, performing arts centres, auditoria and amphitheatres
are NSRs.
4.4.1.2
According
to the observations from site visits and review of relevant land use plans
including the Outline Zoning Plans (OZP), NSRs within 300 m of the Project
boundary have been reviewed. Locations
of the study area and NSRs are shown in Figure 4.1.
In accordance with the OZP (S/K15/25 - Cha Kwo Ling, Yau Tong, Lei
Yue Mun), the study area mainly comprises zoning of village
development, Green Belt, Coastal Protection Area and Other Specifies Uses. No planned NSR is
identified within the study area.
Identified NSRs within 300 m study boundary from the Project are shown
in Table 4.2 below. Photographs of existing NSRs are shown in Appendix 4.1.
Table
4.2 Identified NSRs within 300m
from the Boundary of the Project
|
NSR
|
Land Use
|
NSR Status
|
|
Lei
Yue Mun Village
|
Residential
|
Existing
|
|
Jockey
Club Lei Yue Mun Plus
|
Performing
Arts Centre & Educational institution (1)&(2)
|
Existing
|
|
Ma
Wan Tsuen
|
Residential
|
Existing
|
|
Tin
Hau Temple
|
Place of Worship (1)
|
Existing
|
|
Ma
Pui Tsuen
|
Residential
|
Existing
|
|
Che
Ting Tsuen
|
Residential
|
Existing
|
|
Canaryside
|
Residential
|
Existing
|
Notes:
(1) Places of worship and performing arts centres are NSRs
under the EIAO-TM but there are no specific daytime construction noise
standards for these types of NSRs.
(2)
Jockey Club Lei Yue Mun Plus provides multi-purpose
facilities, including rooms for performing arts and a ceramic workshop. Courses, workshops
and talks are held occasionally in the Jockey
Club Lei Yue Mun Plus for educational purpose,
4.4.1.3
The first layer of NSRs would provide acoustic shielding to those
receivers at further distance behind.
The predicted noise levels at the first layer of NSRs represent the
worst-case scenario, and therefore representative Noise Assessment Points
(NAPs) at these NSRs are selected for construction noise impact
assessment. In accordance with Annex 13
of the EIAO-TM, places of worship and performing arts centres are NSRs. The
EIAO-TM however does not stipulate specific noise limits for these types of
NSRs. A summary of identified
representative NAPs, is presented in Table 4.3 with their locations shown in Figure 4.2 to Figure 4.5.
Table
4.3 Identified Representative
Noise Assessment Points
|
NAP ID
|
Description
|
Land Use
|
Number of
Storeys
|
Daytime
Noise Criterion, Leq (30mins), dB(A)
|
Distance
from The Nearest Boundary of The Works,
m
|
|
HPRC43
|
No.
43, Lei Yue Mun Hoi Pong Road Central
|
Residential
|
2
|
75
|
11
|
|
LYMP
|
Jockey
Club Lei Yue Mun Plus
|
Performing
Arts Centre & Educational institution
|
2
|
70
65
during examination
(1)&(2)
|
<1
|
|
HPRC53A
|
No.
53A, Lei Yue Mun Hoi Pong Road Central
|
Residential
|
2
|
75
|
5
|
|
HPRCV1
|
Village
house in Lei Yue Mun Hoi Pong Road Central
|
Residential
|
1
|
75
|
<1
|
|
HPRCV2
|
Village
house in Lei Yue Mun Hoi Pong Road Central
|
Residential
|
1
|
75
|
24
|
|
HPRE21C
|
No.
21C, Lei Yue Mun Hoi Pong Road East
|
Residential
|
1
|
75
|
12
|
|
HPRE79A
|
No.
79A, Lei Yue Mun Hoi Pong Road East
|
Residential
|
2
|
75
|
8
|
|
HPRE75B
|
No.
75B, Lei Yue Mun Hoi Pong Road East
|
Residential
|
2
|
75
|
1
|
|
HPRE81
|
No.
81, Lei Yue Mun Hoi Pong Road East
|
Residential
|
2
|
75
|
<1
|
|
MWT145
|
No.
145, Ma Wan Tsuen
|
Residential
|
1
|
75
|
<1
|
|
THT
|
Tin
Hau Temple
|
Place of Worship
|
1
|
75(1)&(3)
|
24
|
Note:
(1)
Places
of worship and performing arts centres are NSRs under the EIAO-TM but there are
no specific daytime construction noise standards for these types of NSRs.
(2) Considering that courses,
workshops and talks would be held occasionally
in the Jockey Club Lei Yue Mun Plus (LYMP) for
education purpose, noise criteria of 70 dB(A) and 65 dB(A) during examination
are proposed for the construction noise impact assessment. Based on observations on site, only spilt-type
air-conditioners (A/C) are installed at LYMP, and therefore it is
still considered possible for the NSR at LYMP to rely on opened window for
ventilation. As such, LYMP is identified
as an NSR for the construction noise impact assessment.
(3)
A construction noise assessment criterion of 75 dB(A)
is proposed for Tin Hau Temple. Reference has been made to the approved EIA
report for Tseung Kwan O - Lam Tin Tunnel and Associated Works (EIAO Register
No.: AEIAR-173/2013).
·
construction
of a public landing facility, a promenade and a breakwater which involves dredging
of seabed;
·
Improvement
works of four existing lookout points (i.e. Lookout points 1,3, 4 & 5) and
an existing viewing platform ;
·
construction
of a carp-shaped platform and a pavilion with children play area;
·
beautification
works for the promenade, lookout points and viewing platform by installing
green/planter walls, planting areas, railings and sitting benches, etc.; and
·
streetscape
improvement works (i.e. installation of decorative mosaic tiles along Hoi Pong
Road Central and Hoi Pong Road East).
4.5.1.2
The existing structure of lookout point 2
will be retained, therefore no improvement works will be required.
4.5.1.3
Excavation
works in the lookout points will be carried out manually due to the
insufficient spaces for the use of construction plant. All excavated materials
will be transported to the viewing platform and will be removed off site by
marine vessels.
4.5.1.4
The plant inventory provided by the
Project Engineer for the construction noise impact assessment is presented in Appendix
4.2. Appendix
4.3 presents the currently envisaged work
programme, locations of the work sites and distances between the notional
sources and the NSRs. The feasibility
and practicability for the plant inventory and associated plant utilisation
rates adopted for the assessment have been confirmed by the Project
Engineer. The Project Proponent has also
confirmed the validity of the plant inventory.
The currently envisaged construction programme would not require any
work using PME during restricted hours (i.e. the hours from 1900 to 0700 hours
or at any time on a general holiday) or percussive piling works. Therefore, only the impacts from daytime
general construction activities are assessed in this EIA Report.
Streetscape
Improvement Works
4.5.1.5
One of the noisy activities would be the
streetscape improvement works (i.e. installation of decorative mosaic tiles)
that require the use of handheld breaker along Hoi Pong Road Central and Hoi
Pong Road East at a very short distance from certain NSRs. Based on the preliminary design, however, the
works would only involve an area that measures approximately 1m x 1m in
size. With the very small scale of
breaking works, each of the NSRs is expected to be impacted by the noise from
the streetscape improvement works for the duration of less than an hour per day
over a period of approximately one week only.
Concurrent
Project
4.5.1.6
Based
on the available information, Lei Yue Mun Village Sewerage project would be the
only concurrent project within the Study Area. The description and the construction
programme of the Lei Yue Mun Village Sewerage project are presented in Section
2.12.1.1.
4.6.1.1
The methodology for the construction
noise impact assessment follows the procedures outlined in the GW-TM. The
general approach is summarized as follows:
·
Locate
the NSRs which would most likely be affected by noise from the construction
work;
·
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 to NSRs from notional noise source;
·
Apply
corrections in the calculations such as potential screening effects and
acoustic reflection, if any;
·
Predict
construction noise levels at NSRs in the absence of any mitigation measures;
·
Consider
cumulative impact from concurrent projects within 300 m of the NSRs,
if any; and
·
Compare
the cumulative construction noise level against the corresponding noise
criterion and propose suitable mitigation measures where necessary.
4.6.1.2
For the SWLs of the PME, reference is
made to Table 3 of the GW-TM and "Sound power levels of other commonly
used PME" (Other PME) published by EPD. Where no relevant SWL
can be found in the GW-TM and other PME, reference is made to the information
relating to Quality Powered Mechanical Equipment (QPME) available at EPD’s web
site[1] or PME specification published by
equipment manufacturer. SWLs of the equipment adopted in this noise
assessment and sources of the reference are presented in Appendix
4.4.
4.6.1.3
It is assumed that all PME items required
for a particular construction activity would be located at the notional or
probable source position of work fronts where such activity is to be
performed. The locations of work fronts are
shown in Appendix 4.3. To predict the noise level, PME has been
organised into groups required for each discrete task of the construction
works. The sound pressure level (SPL) of each construction task has been
calculated, depending on the number of plant items involved and the distance
from the NSR. A positive 3 dB façade correction has been added to the predicted
noise levels to account for the façade effect at each assessment point. The
noise levels at the NSRs have then been predicted by adding up the SPLs of all
concurrent construction tasks from the Project and other concurrent projects
identified during the course of the EIA study within the study area. Notional sources that are at distances
greater than 300 m from the NSRs have been excluded from the assessment.
4.6.1.4
The unmitigated construction noise
impacts at the identified NSRs have been predicted accordingly. Practicable
direct mitigation measures including the use of quieter equipment, movable noise
barriers, noise barrier, enclosures and quieter alternative methods have been
considered if exceedance of relevant criteria is predicted. Appropriate correction factors for barrier
effect have been adopted in accordance with Section 2.10 of the GW-TM. In cases where the mitigated noise levels
still exceeded the relevant criteria, the duration of the
noise exceedance would be estimated.
4.7.1.1
For normal daytime working hours,
exceedances of the construction noise criteria for residential uses and
educational institution were predicted at all of the residential NAPs with no
mitigation measures in place. Details of
the unmitigated construction noise assessment are presented in Appendix
4.5 with
the results summarized in Table 4.4. With noise exceedance predicted, direct
noise mitigation measures are required to alleviate the construction noise
impact on the affected NSRs.
Table 4.4 Summary of Unmitigated
Construction Noise Levels
|
NAP ID
|
Daytime
Noise Criterion
Leq (30mins),
dB(A)
|
Predicted
Unmitigated Construction Noise Levels, Leq (30mins), dB(A)
|
Max. Noise
Exceedance, dB(A)
|
|
HPRC43
|
75
|
69
- 80
|
5
|
|
LYMP
|
70
(65
during examination)
(1)&(2)
|
75
- 95
|
25
(30
during examination)
|
|
HPRC53A
|
75
|
87
- 89
|
14
|
|
HPRCV1
|
75
|
74
– 85
|
10
|
|
HPRCV2
|
75
|
67
- 80
|
5
|
|
HPRE21C
|
75
|
68
- 83
|
8
|
|
HPRE79A
|
75
|
66
- 84
|
9
|
|
HPRE75B
|
75
|
70
- 91
|
16
|
|
HPRE81
|
75
|
69
- 96
|
21
|
|
MWT145
|
75
|
60
- 94
|
19
|
|
THT
|
75(1)&(3)
|
55
- 72
|
-
|
Notes:
(1)
Places
of worship and performing arts centres are NSRs under the EIAO-TM but there are
no specific daytime construction noise standards for these types of NSRs.
(2) Considering that courses,
workshops and talks would be held occasionally
in the Jockey Club Lei Yue Mun Plus for
education purpose, noise criteria of 70 dB(A) and 65 dB(A) during examination
are proposed for the construction noise impact assessment.
(3)
A construction noise assessment criterion of 75 dB(A)
is proposed for Tin Hau Temple. Reference has been made to the approved EIA report
for Tseung Kwan O - Lam Tin Tunnel and Associated Works (EIAO Register No.:
AEIAR-173/2013).
4.8.1.1
The results of the construction noise assessment
indicate that, there would be exceedance of the construction noise criteria at
some of the NSRs in the absence of any mitigation measures. The various mitigation options listed below
have thus been considered:
·
Good
site practices to limit noise emissions at the sources;
·
Use
of quiet powered mechanical equipment;
·
Use
of construction noise barriers to screen noise from construction plant; and
·
Scheduling
of Noisy Activities.
4.8.1.2
The above mitigation measures would be
implemented on work sites as good practices where appropriate. Detailed descriptions of these mitigation
measures are given in the following sections.
Good Site Practice
4.8.1.3
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 utilised and should be properly
maintained during the construction program;
·
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; and
·
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;
4.8.1.4
In addition, the “Recommended Pollution
Control Clauses for Construction Contracts” published by the EPD should
be adopted in the Contract Specification for the Contractors to follow and
implement relevant measures and good site practices in minimising noise impact.
Quiet
Powered Mechanical Equipment
4.8.1.5
To reduce the noise impacts at the
affected NSRs during normal daytime working hours, mitigation measure such as
the use of quiet PME is recommended. The
type of quiet PME adopted in this assessment is for reference only. The contractors may adopt alternative quiet
PME as long as it can be demonstrated that they would not result in
construction noise impacts worse than those predicted in this assessment.
4.8.1.6
For the use of quiet plant associated
with the construction works, reference has been made to QPME list available on
the EPD website, which provides the SWLs for specific quiet PME or PME
specification published by equipment manufacturer. The items of QPME and the associated SWLs
adopted for the assessment are listed in Table 4.5.
Table
4.5 SWL of QPME Adopted for
Construction Noise Mitigation
|
Works Area
|
Construction
Activity
|
QPME/Quiet
PME
|
QPME
Reference Number
|
Model number
|
SWL, dB(A)
|
|
LF
(Landing Facility)
|
Install
pipe pile wall retain existing shore
|
Crane,
mobile/barge mounted (diesel)
|
EPD-05690
|
KOBELCO
CKS900
|
101
|
|
Grouting
behind the pipe pile wall
|
Crane,
mobile/barge mounted (diesel)
|
EPD-05690
|
KOBELCO
CKS900
|
101
|
|
Construction
of the breakwater, deck structure, wave absorption chamber and deck furniture
|
Crane,
mobile/barge mounted (diesel)
|
EPD-05690
|
KOBELCO
CKS900
|
101
|
|
Surface
rock excavation
|
Breaker,
excavator mounted (hydraulic)
|
-
|
Atlas
Copco
MB1000
|
119
(1)
|
|
LP1
(Lookout
Point 1)
|
Demolition
of existing structure
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
Backfill
|
Compactor,
vibratory
|
EPD-00054
|
Dynapac
LF
62
|
102
|
|
Beautification
Works
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
LP2
(Lookout
Point 2)
|
Beautification
Works
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
LP4
(Lookout
Point 4)
|
Demolition
of existing structure
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
Beautification
Works
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
LP5
(Lookout
Point 5)
|
Demolition
of existing structure
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
Backfill
|
Compactor,
vibratory
|
EPD-00054
|
Dynapac
LF
62
|
102
|
|
Beautification
Works
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
VP
(Viewing
Platform)
|
Excavation
|
Excavator/loader,
wheeled/tracked
|
EPD-05477
|
KOBELCO
SK30SR-6
|
91
|
|
CP
(Carp
Platform)
|
Construction
of Carp Platform
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
PA
(Pavilion)
|
Provision
of Pavilion
|
Crane,
mobile/barge mounted (diesel)
|
EPD-05690
|
KOBELCO
CKS900
|
101
|
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
|
ST
(Streetscape
Improvement)
|
Streetscape
Improvement Works
|
Hand-held
Percussive Breaker
|
EPD-04329
|
HILTI
TE
1000-AVR
|
99
|
Note:
(1)
Detail
of noise emission and guaranteed SWL
is available on the supplier’s website:
https://www.atlascopco.com/en-uk/mrba/products/excavator-attachments/Hydraulic-breaker/hydraulic-breakers/hydraulic-breaker-MB-1000
Temporary Noise Barriers
4.8.1.7
To
alleviate the construction noise impact on the affected NSRs, temporary noise
barriers would be erected to provide screening from the construction plant.
4.8.1.8
Noise
barriers will become more effective when located immediately adjacent
to the working area, and can reduce the noise level by up to 5 dB(A)
and 10 dB(A) for mobile and stationary plants,
respectively. Portable noise enclosure should be used, as far as
practicable, to mitigate the noise impacts arising from the use of handheld
breaker, air compressor, compactor (vibratory) and drill/grinder, hand-held
electric at some work areas (i.e. works areas LP3, LP4, LP5 and ST) where
locate very close to the NSRs. Use of noise enclosure can reduce the noise
level by up to 15 dB(A). The Contractor will be responsible for design of the
noise barrier and noise enclosure with due consideration given to the size of
the PME and the requirement of intercepting the line of sight between the NSRs
and PME. The construction material of the noise barrier and the
portable noise enclosure should have a minimum surface density of 10 kg/m2
and it should have no openings or gaps.
The typical configuration of noise barrier and portable noise enclosure
is shown in Appendix 4.6.
4.8.1.9
The
plant inventory for the assessment of the mitigated scenario is presented in Appendix 4.7.
Scheduling of Noisy Activities to
Avoid Noise Impact to LYMP
4.8.1.10
To
minimise the construction noise impact on LYMP, the streetscape improvement
works would not be carried out within 10 m from LYMP during the time when LYMP
is used for any noise sensitive purposes, such as holding courses or
workshops. In addition, the
beautification works at work areas LP1 would not be conducted during
examination period. The Contractor should liaise with the operator of LYMP to
obtain the updated schedule of courses, workshops and examination at the time
conducting the relevant construction works.
4.8.1.11
With
the use of QPME and noise barriers and scheduling noisy activities outside the
time when LYMP is used for any noise sensitive purposes, such as holding
courses or workshops, the mitigated construction noise levels at the
representative NAPs would be in the range of 45 to 75 dB(A). The predicted noise impacts at different NAPs
are summarized in Table 4.6 with details of the calculations given in Appendix 4.8.
The results revealed that the construction noise levels at all NSRs
would comply with the EIAO-TM daytime noise criterion after the implementation
of the proposed noise mitigation measures.
Table
4.6 Mitigated Construction Noise
Level
|
NAP ID
|
Daytime Noise
Criterion
Leq (30mins),
dB(A)
|
Predicted
Mitigated Construction Noise Levels
Leq (30mins),
dB(A)
|
Max. Noise
Exceedance, dB(A)
|
|
HPRC43
|
75
|
55
- 62
|
-
|
|
LYMP
|
70
(65
during examination)
|
60
– 67
60
– 65 (during examination period)
|
-
|
|
HPRC53A
|
75
|
66
- 71
|
-
|
|
HPRCV1
|
75
|
66
- 75
|
-
|
|
HPRCV2
|
75
|
61
- 72
|
-
|
|
HPRE21C
|
75
|
65
- 75
|
-
|
|
HPRE79A
|
75
|
52
– 69
|
-
|
|
HPRE75B
|
75
|
55
- 75
|
-
|
|
HPRE81
|
75
|
59
- 75
|
-
|
|
MWT145
|
75
|
50
- 75
|
-
|
|
THT
|
75
|
45
- 54
|
-
|
4.8.2
Cumulative Mitigated Construction
Noise Level
4.8.2.1
As
discussed in Section 4.5, the only concurrent project that may pose cumulative
construction noise impacts would be the Lei Yue Mun Village Sewerage project.
Based on the information available for the LYM Waterfront Enhancement Project
and the preliminary information provided by DSD at the time of preparing this
EIA report, the only works that would have an interface with the LYM Waterfront
Enhancement Project are the construction of underground sewers to LYM Village
along Lei Yue Mun Hoi Pong Road Central and Lei Yue Mun Hoi Pong Road
East.
4.8.2.2
Notwithstanding the above, a preliminary
environmental review (PER) for the Lei Yue Mun Village Sewerage project has
been undertaken by DSD. Based on the construction noise impact assessment
conducted for the PER, construction activities, including breaking of pavement
and reinstatement (concrete) would involve the use of PME. Excavation, pipe
laying and backfilling would be carried out manually and no PME will be
required for these activities.
4.8.2.3
Based
on the plant inventory and the associated noise mitigation measures recommended in
the PER for the Lei Yue Mun Village
Sewerage project, cumulative construction noise impacts have been assessed and
the predicted cumulative construction noise levels at the
representative NAPs are summarized in Table 4.7.
Table
4.7 Mitigated Cumulative Construction Noise
Level
|
NAP ID
|
Daytime
Noise Criterion
Leq (30mins),
dB(A)
|
Predicted
Mitigated Construction Noise Levels,
Leq (30mins) , dB(A)
|
Max. Noise
Exceedance, dB(A)
|
|
LYM
Waterfront Enhancement
|
LYM Village
Sewerage
|
Cumulative
|
|
HPRC43
|
75
|
55
- 62
|
56
|
56
- 63
|
-
|
|
LYMP
|
70
(65
during examination)
|
60
– 67
60
– 65 (during examination period)
|
71
|
71
– 72
|
2
(7 dB(A) during examination)
|
|
HPRC53A
|
75
|
66
- 71
|
65
|
65
- 72
|
-
|
|
HPRCV1
|
75
|
66
- 75
|
77
|
77
- 79
|
4
|
|
HPRCV2
|
75
|
61
- 72
|
49
|
49
- 72
|
-
|
|
HPRE21C
|
75
|
65
- 75
|
60
|
60
- 75
|
-
|
|
HPRE79A
|
75
|
52–
69
|
65
|
65
- 70
|
-
|
|
HPRE75B
|
75
|
55
- 75
|
71
|
71
- 76
|
1
|
|
HPRE81
|
75
|
59
- 75
|
77
|
77
- 79
|
4
|
|
MWT145
|
75
|
50
- 75
|
77
|
77
- 79
|
4
|
|
THT
|
75
|
45
- 54
|
43
|
43
- 54
|
-
|
4.8.2.4
Owing to the close proximity of the
representative NAPs to the works areas of both Projects, the cumulative noise levels
would exceed the EIAO daytime construction noise criteria at LYMP, HPRCV1,
HPRE75B, HPRE81 and MWT145.
4.8.2.5
For the sewer laying works, the
construction would normally be carried out section by section and the road
breaking works would normally last for a short period of time only. It is
anticipated that the duration of exceedance would at most be less than two
hours per day over a period of approximately one week for each NSR, depending
on the exact construction method to be adopted by the sewerage works
contractor.
4.8.2.6
The
construction works of the Lei Yue Mun Village Sewerage project are still being
planned and only a preliminary construction programme is available for
reference at the time of this assessment.
Based on the information of Lei Yue Mun Village Sewerage project
provided by DSD, some of the sewerage construction works would be carried out
within the works area of streetscape improvement works (i.e. along Hoi
Pong Road Central and Hoi Pong Road East). Since conducting sewerage construction works
and streetscape improvement works may involve repeated construction works at
the same location, the ArchSD would closely liaise with DSD and their
contractors in planning the interfacing works to minimise duplicated/concurrent
construction works, including exploring the possibility of entrusting the
streetscape improvement works to DSD, so as to minimise nuisance to nearby
sensitive receivers such as residents, shops, restaurants and educational
institution as far as practicable. Before commencing noisy construction
works, such as road breaking works, in the vicinity of the NSRs, the Contractor
would closely liaise with the affected NSRs to keep them informed of the works
and should strive to complete the works in the shortest time possible. To minimise nuisance to nearby educational
institution and seafood restaurants, noisy construction works would not be
carried out during the examination period of the educational institution and
the peak business hour of the restaurant.
4.9
Evaluation of Residual Impacts
4.9.1.1
With
the implementation of all feasible noise mitigation measures, there would be no
exceedance of the construction noise criteria due to the Project. However, cumulative construction noise levels
are found to exceed the EIAO
daytime construction noise criteria at LYMP, HPRCV1, HPRE75B, HPRE81 and MWT145.
The predicted exceedance from cumulative
impacts is mainly due to the limited separation between the NSRs and the
proposed works areas of the Project and the concurrent project. All practicable direct mitigation measures
have been exhausted to minimise the impacts.
4.9.1.2
It
is recommended that the Contractor liaise closely with the
contractor of the Lei Yue Mun Village Sewerage project to avoid
duplicated/concurrent works near the concerned NSRs as far as practicable.
4.10
Environmental Monitoring and Audit
4.10.1.1
Noise
monitoring is recommended as part of the environmental monitoring and audit
(EM&A) programme for the construction phase of the Project to check
compliance with the daytime construction noise criterion at a frequency
of once a week. The
implementation of the recommended mitigation measures for daytime construction
activities should also be audited as part of the EM&A programme. Details of the EM&A requirements are
provided in the EM&A Manual. Given that residual cumulative noise impacts
were predicted at some NSRs, it is also recommended that the Contractor make
necessary provisions for responding to potential complaints from nearby NSRs,
such as setting up a hotline and/or community liaison group.
4.11
Conclusion
4.11.1.1
This assessment has presented the
construction noise impacts of the Project during normal daytime
working hours. The assessment results indicate that the mitigated noise levels at all NSRs would comply with the noise criteria
set out in the EIAO-TM with the implementation of the proposed noise mitigation
measures, including the use of QPME, deployment of construction noise barriers
and portable noise enclosure and scheduling of noisy activities outside the
time when LYMP is used for any noise sensitive purposes, such as holding course
or workshop. Adverse noise impact during
construction phase is not anticipated.
4.11.1.2
Before commencing noisy construction
works, such as road breaking works, in the vicinity of the NSRs, the Contractor
should closely liaise with the occupants of the affected NSRs to keep them
informed of the works and should strive to complete the works in the shortest
time possible. To minimise nuisance to
operators of nearby seafood restaurants, noisy construction works should
not be carried out during the peak business hour of the restaurant as a
precautionary measure. The
streetscape improvement works should not be carried out within 10 m from LYMP
during the the time when LYMP is used for any noise sensitive purposes, such as
holding course and workshop. The Contractor should also liaise with the operator of LYMP to obtain the examination schedule and
should not carry out the Beautification Works at Look out Point 1 during examination period.
4.11.1.3
Weekly noise monitoring to check
compliance with the daytime noise criterion and auditing of the implementation
of noise mitigation measures are recommended as part of the EM&A programme
for the construction phase of the Project.
4.11.1.4
The
Project is not a noise pollution source and therefore noise impact arising from
the project during operation phase is not anticipated.