CONTENTS
4.2 Relevant Legislation,
Standards and Guidelines
4.5 Potential Sources of
Impact
4.6 Assessment Approach and
Methodology
4.11 Monitoring and Audit
Requirement
TABLES
Table 4‑1 EIAO-TM Day-time
Construction Noise Standards
Table 4‑2 Area
Sensitivity Ratings
Table 4‑4 ANLs
to be used as Operational Noise Criteria
Table 4‑5 Measured
Prevailing Noise Levels
Table 4‑6 Representative
Noise Sensitive Receivers (NSRs)
Table 4‑7 Predicted
Construction Noise Levels (Without Mitigation Measures)
Table 4‑8 Fixed
Plant Noise Design Criteria
Table 4‑9 Predicted
Construction Noise Levels (Mitigated Scenario 1)
Table 4‑10 Predicted
Construction Noise Levels (Mitigated Scenario 2)
Table 4‑11 Predicted
Cumulative Construction Noise Levels
Table 4‑12 Predicted
Cumulative Fixed Plant Noise Levels
4.1.1
This
Section provides an evaluation of the potential noise impacts arising from the
construction and operation of the proposed Project. Appropriate mitigation measures will be
recommended, where necessary, in order to mitigate any unacceptable impacts.
Construction Noise
4.2.1
The
principal legislation relating to the control of construction noise is the
Environmental Impact Assessment Ordinance (EIAO) (Cap. 499). The Technical Memorandum on Environmental
Impact Assessment Process (EIAO-TM), issued under the EIAO, provides guidelines
and noise criteria for evaluating noise impacts. The assessment criteria are
defined in Annex 5 of the EIAO-TM.
4.2.2
The
Noise Control Ordinance (Cap. 400) (NCO) also provides means to assess
construction noise impacts. Various
Technical Memoranda (TMs), which stipulate control approaches and criteria,
have been issued under the NCO. The
following TMs are applicable to the control of noise impacts from construction
activities:
·
Technical
Memorandum on Noise from Construction Work other than Percussive Piling
(GW-TM); and
·
Technical
Memorandum on Noise from Construction Work in Designated Areas (DA-TM).
General
Construction Works during Normal Working Hours
4.2.3
Under
the EIAO, potential noise impact arising from general construction works during
normal working hours (i.e. 0700 to 1900 hrs on any day not being a Sunday or
general holiday) at 1 m from the external façade of the noise sensitive uses,
which rely on opened windows for ventilation, is to be assessed in accordance
with the noise criteria specified in the EIAO-TM. The EIAO-TM noise standards are presented in Table 4‑1.
Table 4‑1 EIAO-TM Day-time Construction Noise Standards
|
Noise Sensitive Uses |
Noise Standard 0700 to 1900 hours on any day not being a
Sunday or general holiday Leq, 30 min (dB(A)) |
|
All domestics premises including temporary
housing accommodation |
75 |
|
Hotels and hostels |
75 |
|
Educational Institutions including kindergartens,
nurseries and all others where unaided voice communication is required |
70
/ 65 (During examinations) |
|
Notes: The above standards apply to uses which rely on
opened windows for ventilation. The above standards shall be viewed as the maximum
permissible noise levels assessed at 1m from the external façade. |
|
General Construction
Works during Restricted Hours
4.2.4
The
NCO provides statutory controls on general construction works during restricted
hours (i.e. 1900 to 0700 hours or any time on Sundays or general
holidays). The use of powered mechanical
equipment (PME) for carrying out construction works during these restricted
hours would require a Construction Noise Permit (CNP). The Noise Control Authority will assess all
CNP applications on a case-by-case basis and, in doing so the authority advises
that they will be guided by the GW-TM.
4.2.5
When
assessing an application for CNP for the use of PME during restricted hours,
the Noise Control Authority will compare the Acceptable Noise Levels (ANLs)
specified in the GW-TM with the Corrected Noise Levels (CNLs) (i.e. after
accounting for factors such as barrier effects and reflections) associated with
the proposed PME operations. The NCO
requires that noise levels from construction at affected Noise Sensitive
Receiver (NSR) be less than the specified ANL.
The ANLs are related to the inherent noise sensitivity of the noise
receiver areas in question, and different Area Sensitivity Ratings (ASRs, i.e.
A, B or C, see Table
4‑2) have been established to reflect the background characteristics of
different areas. Each noise receiver
area is assigned an ASR based on its predominant land use and the presence, if
any, of Influencing Factors (IFs) such as nearby industrial areas, major roads
or airports. The appropriate ASR for the
NSR is determined with reference to Table
4‑2. The relevant ANLs for each ASR are shown in Table 4‑3.
Table 4‑2 Area Sensitivity Ratings
|
Types
of Area Containing NSR |
Degree to which NSR
is affected by Influencing Factor (IF) |
||
|
Not Affected |
Indirectly Affected |
Directly Affected |
|
|
Rural area, including Country Parks or village
type developments |
A |
B |
B |
|
Low density residential area consisting of
low-rise or isolated high-rise developments |
A |
B |
C |
|
Urban area |
B |
C |
C |
|
Area other than those above |
B |
B |
C |
|
Notes: The
following definitions apply: "Country
Park" means an area that is designated as a country park pursuant to
section 14 of the Country Parks Ordinance; "directly
affected" means that the NSR is at such a location that noise generated
by the IF is readily noticeable at the NSR and is a dominant feature of the
noise climate of the NSR; "indirectly
affected" means that the NSR is at such a location that noise generated
by the IF, whilst noticeable at the NSR, is not a dominant feature of the
noise climate of the NSR; "not
affected" means that the NSR is at such a location that noise generated
by the IF is not noticeable at the NSR; and "urban
area" means an area of high density, diverse development including a
mixture of such elements as industrial activities, major trade or commercial
activities and residential premises. |
|||
Table 4‑3 Acceptable Noise Levels (ANLs) for General
Construction Works to be carried out during Restricted Hours (GW-TM)
|
Time
period |
Area Sensitivity
Rating Leq, 5 min (dB(A)) |
||
|
|
A |
B |
C |
|
All days during the evening (i.e. 1900-2300 hrs)
and general holidays (including Sundays) during the day and evening (i.e.
0700-2300 hrs) |
60 |
65 |
70 |
|
All days during the night-time (i.e. 2300-0700
hrs) |
45 |
50 |
55 |
|
Note: (a) The above standard applies to uses which
rely on opened windows for ventilation. |
|||
4.2.6
The
Noise Control Authority will consider a well-justified CNP application for
construction works within restricted hours as guided by the relevant Technical
Memorandum issued under the NCO. The
Noise Control Authority will take into account adjoining land uses and any
previous complaints against construction activities at the site before making a
decision. Factors influencing the
outcome of a CNP application, such as the assigning of ANLs, would be
determined by the Noise Control Authority at the time of the application review
based on the prevailing site conditions which may change from time to time.
4.2.7
The
DA-TM issued under the NCO indicates a list of Specified Powered Mechanical
Equipment (SPME) and the types of Prescribed Construction Work (PCW) to be
regulated within restricted hours in Designated Areas (DAs). Under the DA-TM, the use of five types of SPME
and the carrying out of three types of PCW within a designated area during
restricted hours would require a valid CNP.
The SPME includes hand-held breaker, bulldozer, concrete lorry mixer,
dump truck and hand-held vibratory poker.
The PCW are:
·
Erecting or
dismantling of formwork or scaffolding;
·
Loading,
unloading or handling of rubble, wooden boards, steel bars, wood or scaffolding
material; and
·
Hammering.
4.2.8
Part
of the Project Site (i.e. works areas for water main laying along Chuk Yuen
Road, Shatin Pass Road and Tsz Wan Shan Road) falls within the designated area
under the NCO. Any PCW and use of SPME during the restricted hours within the
designated area shall be controlled by the TM-DA. The Noise Control Authority
will assess the CNP applications based on procedures and requirements as
described in the DA-TM. In general, it
should not be presumed that a CNP would be granted for the carrying out of PCW
within a designated area during the restricted hours. The CNP may be granted for the execution of
construction works within a designated area during restricted hours involving
the use of SPME if the relevant ANL and criteria stipulated in the DA-TM can be
satisfied. In the EIA stage, no PCW and use of SPME is proposed for
construction within the designated area during the restricted hours.
Operation Noise
4.2.9
Fixed
plant noise associated with the operation of a project is controlled under
Section 13 of the NCO, and the Technical Memorandum for the Assessment of Noise
from Places Other than Domestic Premises, Public Places or Construction Sites
(IND-TM).
4.2.10
The
noise criteria, in terms of ANLs, stipulated in the IND-TM apply for all days
and general holidays. The ANLs are
dependent on the ASR of the NSRs and the time of the day and are presented in Table
4‑4.
Table 4‑4 ANLs to be used as Operational Noise Criteria
|
Time Period |
Leq
30min (dB(A)) |
||
|
ASR
“A” |
ASR
“B” |
ASR
“C” |
|
|
Day-time (0700 - 1900 hrs) |
60 |
65 |
70 |
|
Evening (1900 - 2300 hrs) |
60 |
65 |
70 |
|
Night-time (2300 - 0700 hrs) |
50 |
55 |
60 |
4.2.11
The
Project Site is located in urban Kowloon with high rise residential premises.
There are no industrial areas within the 300m assessment area. However,
according to the Annual Traffic Census 2018, the annual average daily traffic
(AADT) for Lung Cheung Road was in excess of 30,000 which is considered as an
IF. An ASR of “C” is adopted for those
NSRs affected by this major road while an ASR of “B” is adopted for other NSRs.
4.2.12
For
the purpose of EIA, fixed plant noise associated with the operation of a
project is controlled under the EIAO.
The noise standards are set out in the Annex 5 of EIAO-TM as follows:
·
The total
fixed source noise level at the façade of the nearest NSR is at least 5 dB(A)
lower than the appropriate ANL (as shown in Table
4‑4 as specified in IND-TM); or
·
Where the
prevailing noise level in the area is 5 dB(A) or more below the appropriate
ANL, the total fixed source noise level must not exceed this noise level.
4.2.13
In
any event, the noise limit adopted in this Report is for an indicative
operational noise assessment only. It
should be noted that 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 this Report shall bind
the Noise Control Authority in the context of law enforcement against any fixed
noise source being assessed.
4.3.1
The
ambient noise of the Project area is mainly from road traffic noise along Lung
Cheung Road, Chuk Yuen Road, Chui Chuk Street, Wing Chuk Street, Shatin Pass
Road, Tsz Wan Shan Road and Sheung Fung Street. Apart from traffic noise, the
existing DHPS also contributed to the ambient noise level albeit in a very
localised area. Noise from the DHPS will cease upon its relocation to the
cavern. A baseline noise measurement was conducted to obtain the prevailing
noise environment of the surrounding area. The locations of the noise
measurement points are shown in Figure 4.3. Summary of the prevailing noise levels is
provided in Table
4‑5 below.
Table 4‑5 Measured Prevailing Noise Levels
|
Noise Measurement
Point |
Measurement Location |
Range of Noise Level, Leq(30 min), dB(A) |
|
|
Daytime & Evening
(07:00-23:00) |
Night time (23:00-07:00) |
||
|
M1 |
Meridian Hill |
74
– 81 |
70
– 80 |
|
M2 |
Tin Ma Court |
60
– 67 |
56
– 69 |
|
M3 |
Tin Wang Court (near Car Park) |
68
– 76 |
59
– 75 |
|
M4 |
Tin Wang Court (near Wang Yuen Court) |
70
– 75 |
58
– 77 |
|
M5 |
Tsui Chuk Garden, Block 6 |
58
– 66 |
51
– 64 |
|
Note: Free field measurement was made at all
monitoring locations. A correction of +3dB(A) was included in the results. |
|||
|
|
|||
4.4.1
Noise
sensitive receivers (NSRs) were identified according to the criteria set out in
the EIAO-TM. In accordance with the requirements stated in Clause 3.4.4.2 of
the EIA Study Brief, the Study Area for the noise impact assessment covered an
area of 300 m from the boundary of the Project Site. All existing NSRs within
the Study Area has been identified as listed in Appendix 4A and their locations are indicated in Figure 4.1.
4.4.2
Only
the first layer of the NSRs has been selected for assessment as it would
provide acoustic shielding to those receivers at further distance behind. Reference
has been made to the topographic maps, approved Kowloon Tong Outline Zoning
Plan No. S/K18/21, the Draft Wang Tau Hom & Tung Tau Outline Zoning Plan
No. S/K8/21 and the Approved Tsz Wan Shan, Diamond Hill & San Po Kong Outline
Zoning Plan No. S/K11/29 in identifying appropriate NSRs. In addition, site
visits have been conducted to verify the NSRs and its assessment point. The
identified representative NSRs for assessment are shown in Table
4‑6 and their locations are indicated in Figure 4.2. Photos of the existing representative NSRs are provided in Appendix 4A.
Table 4‑6 Representative Noise Sensitive Receivers
(NSRs)
|
Description |
Types of NSRs |
No. of Floors |
Noise Assessment |
||
|
Construction |
Operation |
||||
|
NSR
1 |
Block
B, Peninsula Heights |
Residential |
14 |
Yes |
Yes |
|
NSR
2 |
Block
1, Meridian Hill |
Residential |
9 |
Yes |
Yes |
|
NSR
3 |
Chun
Sing House, Tin Ma Court |
Residential |
37 |
Yes |
Yes |
|
NSR
4 |
Chun
Wai House, Tin Ma Court |
Residential |
37 |
Yes |
Yes |
|
NSR
5 |
Grace
Methodist Church Kindergarten |
Educational |
1 |
Yes |
Yes |
|
NSR
6 |
Wang
King House, Tin Wang Court |
Residential |
21 |
Yes |
Yes |
|
NSR
7 |
Block
6, Tsui Chuk Garden |
Residential |
22 |
Yes |
Yes |
|
NSR
8 |
Baptist
Rainbow Primary School |
Educational |
7 |
Yes |
No |
|
NSR
9 |
Pang
Ching Court |
Residential |
34 |
Yes |
No |
|
NSR
10 |
Chung
Yuen House, Chuk Yuen North Estate |
Residential |
34 |
Yes |
No |
|
NSR
11 |
Wah
Yuen House, Chuk Yuen South Estate |
Residential |
17 |
Yes |
No |
|
NSR
12 |
Mui
Yuen House, Chuk Yuen North Estate |
Residential |
34 |
Yes |
No |
|
NSR
13 |
Our
Lady of Maryknoll Hospital |
Care
Centre |
7 |
Yes |
No |
|
NSR
14 |
Our
Lady's College |
Educational |
7 |
Yes |
No |
|
NSR
15 |
Evangel
Children's Home |
Care
Centre |
6 |
Yes |
No |
|
NSR
16 |
Wing
Shing House |
Residential |
5 |
Yes |
No |
|
NSR
17 |
Ying
Fuk Court |
Residential |
37 |
Yes |
No |
|
NSR
18 |
Diamond
Hill Kwong Yum Home for the Aged |
Care
Centre |
7 |
Yes |
No |
|
NSR
19 |
St.
Bonaventure College and High School |
Educational |
8 |
Yes |
No |
|
NSR
20 |
Wu
York Yu Health Centre |
Care
Centre |
4 |
Yes |
No |
|
NSR
21 |
Twghs
Wong Tai Sin Hospital |
Hospital |
5 |
Yes |
No |
|
NSR
22 |
Ho
Lap Primary School |
Educational |
7 |
Yes |
No |
|
NSR
23 |
Lok
Shing House, Tsz Lok Estate |
Residential |
40 |
Yes |
No |
|
NSR
24 |
Fat
Chong Temple |
Temple |
4 |
Yes |
No |
|
NSR
25 |
Wo
Tin House |
Residential |
41 |
Yes |
No |
|
NSR
26 |
CCC
Kei Tsz Primary School |
Educational |
6 |
Yes |
No |
|
NSR
P1 |
Proposed
Departmental Quarters for Customs & Excise Department |
Residential
(Planned) |
25 |
Yes |
No |
Construction Phase
4.5.1
The
Project will generally include the following main construction works:
·
Site mobilization
·
Construction
of cavern for relocation of DHSRs and DHPS and tunnel portal;
·
Construction
of the fresh water and salt water service reservoirs and associated pumping
stations and other ancillary facilities;
·
Fresh water /
salt water mains laying works;
·
E&M Installation for ancillary facilities and
relocated DHSRs and pumping stations; and
·
Slope, landscaping works and reinstatement for
access tunnel portal.
4.5.2
Major
construction activities will involve site clearance, surface breaking,
drilling, excavation, cavern construction, water main laying, concreting works,
E&M installation and landscaping works. For the construction of the cavern,
most part will be conducted using drill and break/blast method while a short
tunnel section at portal (~40m) will adopt cut and cover excavation due to
insufficient rock cover. It is considered that construction noise impact would
be limited to areas near the portal. As the major works continue into the
tunnel, the cavern will provide the necessary shielding effect and construction
noise is expected to reduce. For water main laying, the water mains will be
constructed section by section using open cut method. Despite of short
construction period for each section, most of the water mains to be constructed
along the road are close to the nearby NSRs and may lead to significant noise
impact and noise concerns without mitigation measures.
4.5.3
Regarding
the blasting operation for cavern/tunnel construction, there is no statutory
procedure or criteria under the NCO and EIAO for assessing the blasting impacts
and is therefore beyond the scope of the EIA. However, the administrative and
procedural control of all blasting operations in Hong Kong is vested in the
Mines Division of the CEDD. The
Dangerous Goods (General) Regulations (Cap 295B) also stipulates that no person
shall carry out blasting unless he/she possesses a valid mine blasting
certificate to be issued by the Mines Division of CEDD. The Superintendent of Mines will review the
application on a case-by case basis before issuing the Mine Blasting
Certificate. As blasting operation will be in very short duration (few seconds)
with a frequency of only once a day and will be carried out within cavern covered
with noise enclosure, the construction noise arising from blasting is
considered as transient and minimal.
4.5.4
The
construction programme for noise calculation is presented in Appendix 2A.
4.5.5
Based
on the current preliminary programme, no construction works will be required
during restricted hours under the NCO. Percussive piling work is also not
expected.
Operation Phase
4.5.6
During
operation of the Project, the relocated DHPS may pose potential fixed noise
impact to nearby NSRs. The water pumps for relocated DHPS will be operated
inside the cavern and thus substantially enclosed with concrete structures or
physical rock mass. The cavern structure is an effective natural barrier for
airborne noise propagation. Noise impact from these facilities is anticipated
to be insignificant.
4.5.7
On
the other hand, ventilation system, transformer room and emergency generator in the ancillary building would be potential
fixed noise sources during operation phase.
4.5.8
The
ancillary building, relocated DHSRs and pumping stations will be unmanned
during operation phase. Routine checking by WSD will be carried out on daily
basis. Maintenance works such as
condition assessment, servicing, repair and replacement of system components
will be conducted on routine basis. Adverse traffic noise impact is not
expected during operation.
4.6.1
The
noise assessment followed the criteria and guidelines as stated in Annexes 5
and 13 of the EIAO-TM for evaluating and assessing noise impact arising from
construction and operation of the Project.
Construction Phase
4.6.2
The
construction noise impact assessment was conducted based on standard acoustic
principles. The assessment also makes reference to the following:
·
Annex 5 and
Annex 13 of EIAO-TM.
·
Technical
Memorandum on Noise from Construction Works other than Percussive Piling
(GW-TM).
·
BS5228-1:2009
– Code of Practice for Noise and Vibration Control on Construction and Open
Sites, Part 1: Noise (BS 5228).
·
EIAO Guidance
Note No. 9/2010 – Preparation of Construction Noise Impact Assessment under the
EIA Ordinance.
4.6.3
In
general, the methodology outlined in the GW-TM is adopted for the construction
noise assessment and is summarised below:
(i)
Locate the NSRs which will most likely
be affected by noise from the construction work;
(ii)
Determine the items of Powered
Mechanical Equipment (PME) for respective construction activities, based on
available information;
(iii)
Assign sound power levels (SWLs) to the
proposed PME according to the above referenced TM or other sources;
(iv)
Calculate distance attenuation and
screening effects to NSRs from notional noise source;
(v)
Predict construction noise levels at
NSRs in the absence of any mitigation measures;
(vi)
Add +3 dB(A) façade correction to the
predicted noise levels in order to account for the façade effect at each NSR;
(vii)
Consider cumulative impact from concurrent
projects within 300 m of the NSRs, if any; and
(viii)
Compare the cumulative construction noise
level against the corresponding noise criterion and propose suitable mitigation
measures where necessary.
4.6.4
The
assessment has been undertaken on the basis of the assumption that all
construction equipment will be located on a notional noise source point (in
accordance with the GW-TM) and is operating at the same time. The various
construction activities are not expected to be carried out concurrently.
Shielding effect from existing building structures, roadside noise barriers,
topographic features and/or neighbouring construction sites have not been
considered to simulate worst-case effect. A façade correction of +3 dB(A) is
added to account for the sound reflection from the building’s surface of an
NSR. The potential noise impacts at NSRs were evaluated by comparing the
predicted noise levels with the EIAO-TM daytime construction noise limits.
4.6.5
The
type and quantity of PME likely to be used in each construction works described
above and their Sound Power Level (SWL) are listed in Appendix 4C. The works are standard civil engineering
works and the equipment will be those typically found in similar tunneling
projects. The equipment used in the noise calculation was based on other
similar approved EIAs, site experience and was reviewed by the design
engineers. The types and numbers of PME and the percentage on time of each type
of PME used in the calculation were confirmed to be reasonable and practical by
the design engineer based on the tentative construction programme, though there
may be variation in the actual construction stage. It should be noted that this
is an assumption of the most likely equipment to be used. The actual
construction equipment will be determined by the contractor performing the
works.
Operation Phase
4.6.6
The
operational noise impact assessment was conducted based on standard acoustic
principles and followed the procedures outlined in IND-TM. The assessment also
makes reference to the following:
·
Annex 5 and
Annex 13 of EIAO-TM.
·
Technical
Memorandum for the Assessment of Noise from Places other than Domestic
Premises, Public Places or Construction Sites (IND-TM).
·
Good
Practices on Pumping System Noise Control (GP-PS).
·
Good
Practices on Ventilation System Noise Control (GP-VS).
4.6.7
As
details of the ancillary building layout and specifications of the fixed plant
are not yet available at this stage, the maximum permissible sound power levels
of fixed plant (max. SWLs) are determined for future detailed engineering
design to ensure compliance with the relevant noise criteria.
4.6.8
The
following formula is used for calculating the max. SWL:
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. 20 log D + 8 (where D is the distance in metres)]
FC
= façade correction, in dB(A) [i.e. 3dB(A)]
TC
= tonal correction, in dB(A)
BC
= barrier correction, in dB(A)
4.6.9
It
is assumed that all fixed plant noise sources would be operated at the same
time with no noise barrier or acoustic screening correction for a conservative
assessment of the worst-case scenario.
4.6.10
The
fixed noise sources associated with the Project should be free of the
characteristics of tonality, impulsiveness and intermittency. Nonetheless, a
conservative +3 dB(A) tonality correction was applied in the preliminary
assessment. If the above characteristics are identified during detailed design,
the max. SWL should be reduced in accordance with the applicable correction
factors as prescribed in the IND-TM.
4.6.11
There
would be some limitations such as the accuracy of the prediction for future
conditions (e.g. plant inventory for the proposed construction works and fixed
plant for future operation).
4.6.12
During
the assessment, realistic worst-case assumptions have been made in order to
provide a conservative assessment of noise impacts. The construction noise impact was assessed
based on conservative estimates for the types of plant and methods of working.
For operation noise assessment, being the worst-case scenario, all items of
equipment have been assumed to operate simultaneously during the operation
period. For determining the distance correction factors, the horizontal
distances between the noise source positions and the NSRs were used for
representing the worst level of the representative NSRs for both construction
and operation phases.
4.7.1
The
predicted construction noise levels during the construction phase are
calculated in accordance with the methodology described in GW-TM. The results
are summarised in Table
4‑7 with details of the noise calculations given in Appendix 4C.
Table 4‑7 Predicted
Construction Noise Levels (Without Mitigation Measures)
|
NSR No. |
Description |
Maximum Predicted Noise
Level, dB(A) |
Noise Criteria, Leq,
30min, dB(A) |
Compliance |
|
NSR 1 |
Block B, Peninsula
Heights |
83 |
75 |
No |
|
NSR 2 |
Block 1, Meridian Hill |
83 |
75 |
No |
|
NSR 3 |
Chun Sing House, Tin Ma
Court |
80 |
75 |
No |
|
NSR 4 |
Chun Wai House, Tin Ma
Court |
81 |
75 |
No |
|
NSR 5 |
Grace Methodist Church
Kindergarten |
84 |
70/65 (a) |
No |
|
NSR 6 |
Wang King House, Tin
Wang Court |
83 |
75 |
No |
|
NSR 7 |
Block 6, Tsui Chuk
Garden |
79 |
75 |
No |
|
NSR 8 |
Baptist Rainbow Primary
School |
74 |
70/65 (a) |
No |
|
NSR 9 |
Pang Ching Court |
76 |
75 |
No |
|
NSR 10 |
Chung Yuen House, Chuk
Yuen North Estate |
79 |
75 |
No |
|
NSR 11 |
Wah Yuen House, Chuk
Yuen South Estate |
80 |
75 |
No |
|
NSR 12 |
Mui Yuen House, Chuk
Yuen North Estate |
76 |
75 |
No |
|
NSR 13 |
Our Lady of Maryknoll
Hospital |
91 |
75 |
No |
|
NSR 14 |
Our Lady's College |
89 |
70/65 (a) |
No |
|
NSR 15 |
Evangel Children's Home |
85 |
75 |
No |
|
NSR 16 |
Wing Shing House |
86 |
75 |
No |
|
NSR 17 |
Ying Fuk Court |
70 |
75 |
Yes |
|
NSR 18 |
Diamond Hill Kwong Yum
Home for the Aged |
81 |
75 |
No |
|
NSR 19 |
St. Bonaventure College
and High School |
88 |
70/65 (a) |
No |
|
NSR 20 |
Wu York Yu Health Centre |
87 |
75 |
No |
|
NSR 21 |
Twghs Wong Tai Sin
Hospital |
74 |
75 |
Yes |
|
NSR 22 |
Ho Lap Primary School |
77 |
70/65 (a) |
No |
|
NSR 23 |
Lok Shing House, Tsz Lok
Estate |
77 |
75 |
No |
|
NSR 24 |
Fat Chong Temple |
70 |
75 |
Yes |
|
NSR 25 |
Wo Tin House |
82 |
75 |
No |
|
NSR 26 |
CCC Kei Tsz Primary
School |
75 |
70/65 (a) |
No |
|
NSR P1 |
Proposed Departmental
Quarters for Customs & Excise Department |
86 |
75 |
No |
|
Notes: (a) 70/65
denotes noise criteria during normal school days / examination period,
respectively. |
||||
4.7.2
The
predicted noise levels at the representative NSRs range from 70 to 91 dB(A).
Results indicate that the construction noise levels at most of the
representative NSRs exceeded the EIAO-TM noise criteria in day-time during the
course of the construction period. Therefore, mitigation measures will be
required.
4.7.3
As
the fresh water and salt water pumping stations will be locating inside cavern adjacent to
the service reservoirs which are over
300m from the nearest NSR and the pumps will be fully enclosed within a machine
room, fixed noise impact is not expected during operation.
4.7.4
The
main fixed noise sources will be generated from the ancillary building include ventilation
system and transformer room which is locating adjacent to the tunnel portal
entrance/exist. The location of the ancillary building and representative NSRs
during operation phase are shown in Figure 4.3. The following noise assessment during operation
phase is focused on the fixed plant noise sources from the ancillary building.
4.7.5
As
details of the layout and noise specification of the equipment in the ancillary
building will be developed by Contractor, the maximum permissible SWL from the
ancillary building are determined for future detailed engineering design to
ensure compliance with the relevant noise criteria. As a conservative approach,
the maximum
permissible SWL for plant was estimated with the nearest
distances of the ancillary building boundary to the representative NSRs. The fixed plant noise criteria at
the NSR was based on the IND-TM (i.e. ANL - 5 dB(A)) or the prevailing
background noise level whichever is lower. Details of the calculation of
maximum permissible SWL is provided in Appendix 4D and summarised in Table
4‑8 below.
Table 4‑8 Fixed Plant
Noise Design Criteria
|
NSR |
ANL -5 dB |
Background Noise Measurement Location |
Measured Lowest Background Noise Level, dB(A) |
Fixed Noise Criteria, dB(A)* |
Maximum Permissible Sound Power Level, dB(A) |
||
|
Day and Evening |
Night |
Day and Evening |
Night |
||||
|
NSR
1 |
65 |
55 |
M1 |
74 – 81 |
70 – 80 |
55 |
100 |
|
NSR
2 |
65 |
55 |
M1 |
74 – 81 |
70 – 80 |
55 |
99 |
|
NSR
3 |
60 |
50 |
M2 |
60 – 67 |
56 – 69 |
50 |
91 |
|
NSR
4 |
60 |
50 |
M2 |
60 – 67 |
56 – 69 |
50 |
91 |
|
NSR
5 |
60 |
50 |
M3 |
68 – 76 |
59 – 75 |
50 |
93 |
|
NSR
6 |
60 |
50 |
M4 |
70 – 75 |
58 – 77 |
50 |
99 |
|
NSR
7 |
60 |
50 |
M5 |
58 – 66 |
51 – 64 |
50 |
97 |
|
Note: * The night time measured noise level
which is lower than ANL -5 dB was adopted as the fixed noise criteria for
worst case assessment. |
|||||||
4.7.6
There
are seven representative NSRs during operation phase and the maximum
permissible SWL for each NSRs have been predicted. The lowest maximum
permissible SWL of 91 dB(A) shall be adopted. It is expected that by ensuring
the required maximum SWL is maintained, no exceedance of the fixed noise level
is expected. The contractor should ensure the compliance of the maximum
permissible SWL for plant with the nearest distance of the ancillary building
to the NSRs to the Engineer for approval.
4.8.1
To
minimise the potential construction noise impacts of the watermain laying work,
the contractor should limit the pipe section to be constructed by open cut
method in a length of no more than 30 m at any one time when works are in close
proximity to NSRs. Each work front along
the proposed watermain laying should be separated by a clearance distance of at
least 60 m. In view of the predicted noise exceedances during the construction
of the Project, the following mitigation measures have been considered:
4.8.2
The
use of quiet PME is considered to be a practicable means to mitigate the
construction noise impact. Quiet plant
is defined as a PME having actual SWL lower than the value specified in the
GW-TM. Quiet PME that have been adopted
in the assessment are presented in Appendix 4E.
4.8.3
The
use of noise barriers will be an effective means to mitigate the noise impact
arising from the construction works. The
use of noise barrier for certain PME could generally provide a 5 dB(A)
reduction for movable PME and 10 dB(A) for stationary PME. Movable noise barriers of 3m or above in
height with skid footing should be used and located within a few metres of
stationary plant and mobile plant such that the line of sight to the NSR is
blocked by the barriers. Noise enclosure lined with absorptive materials shall
be provided at the tunnel portal to mitigate the noise from tunnel/cavern
construction. The enclosure is a gap free enclosure
with acoustic doors for vehicular access purpose. The acoustic doors shall remain closed throughout
the construction period. The sheet material mass of the noise enclosure should
be at least 10 kg/m2 and sound-absorbent lining inside the enclosure
should be at least 25 mm thick.
4.8.4
With
reference to EPD’s “A Practical Guide for the Reduction of Noise from
Construction Works”, the noise barrier material should have a superficial
surface density of at least 10 kg/m2 and have no openings or
gaps. The movable noise barrier should
be about 3m or above in height and with a short-cantilevered section on the
top, if necessary, such that the line of sight to the NSR is blocked by the
barriers. A 10 dB(A) and 5 dB(A) reduction is assumed in this assessment for
stationary and mobile PME. With reference to the approved EIA Report of West
Island Line (AEIAR-126/2008), a 20 dB(A) reduction is assumed for works inside
the caverns with noise enclosure. The contractor should regularly inspect and
maintain the noise barrier / enclosure to ensure its effectiveness during
construction phase. The contractor should design and provide details of the
temporary noise barriers and noise enclosure to the Engineer for approval.
4.8.5
The
mitigated noise levels at the representative NSRs for mitigated scenario 1 were
calculated and the results are summarised in Table 4‑9. with details of the calculations given in The
detailed calculations is given in Appendix 4E. With the implementation of the mitigated
scenario 1, noise exceedances at NSR 5, NSR 13, NSR 14, NSR 19, NSR 20 and NSR
22 are predicted.
Table 4‑9 Predicted Construction Noise Levels (Mitigated
Scenario 1)
|
NSR No. |
Description |
Maximum Predicted Noise Level, dB(A) |
Noise Criteria, Leq, 30min, dB(A) |
Compliance |
|
NSR
1 |
Block
B, Peninsula Heights |
71 |
75 |
Yes |
|
NSR
2 |
Block
1, Meridian Hill |
72 |
75 |
Yes |
|
NSR
3 |
Chun
Sing House, Tin Ma Court |
66 |
75 |
Yes |
|
NSR
4 |
Chun
Wai House, Tin Ma Court |
67 |
75 |
Yes |
|
NSR
5 |
Grace
Methodist Church Kindergarten |
72 |
70/65 (a) |
No |
|
NSR
6 |
Wang
King House, Tin Wang Court |
72 |
75 |
Yes |
|
NSR
7 |
Block
6, Tsui Chuk Garden |
63 |
75 |
Yes |
|
NSR
8 |
Baptist
Rainbow Primary School |
63 |
70/65 (a) |
Yes |
|
NSR
9 |
Pang
Ching Court |
64 |
75 |
Yes |
|
NSR
10 |
Chung
Yuen House, Chuk Yuen North Estate |
68 |
75 |
Yes |
|
NSR
11 |
Wah
Yuen House, Chuk Yuen South Estate |
69 |
75 |
Yes |
|
NSR
12 |
Mui
Yuen House, Chuk Yuen North Estate |
65 |
75 |
Yes |
|
NSR
13 |
Our
Lady of Maryknoll Hospital |
80 |
75 |
No |
|
NSR
14 |
Our
Lady's College |
79 |
70/65 (a) |
No |
|
NSR
15 |
Evangel
Children's Home |
75 |
75 |
Yes |
|
NSR
16 |
Wing
Shing House |
75 |
75 |
Yes |
|
NSR
17 |
Ying
Fuk Court |
59 |
75 |
Yes |
|
NSR
18 |
Diamond
Hill Kwong Yum Home for the Aged |
71 |
75 |
Yes |
|
NSR
19 |
St.
Bonaventure College and High School |
77 |
70/65 (a) |
No |
|
NSR
20 |
Wu
York Yu Health Centre |
77 |
75 |
No |
|
NSR
21 |
Twghs
Wong Tai Sin Hospital |
63 |
75 |
Yes |
|
NSR
22 |
Ho
Lap Primary School |
66 |
70/65 (a) |
No |
|
NSR
23 |
Lok
Shing House, Tsz Lok Estate |
66 |
75 |
Yes |
|
NSR
24 |
Fat
Chong Temple |
58 |
75 |
Yes |
|
NSR
25 |
Wo
Tin House |
71 |
75 |
Yes |
|
NSR
26 |
CCC
Kei Tsz Primary School |
64 |
70/65 (a) |
Yes |
|
NSR
P1 |
Proposed
Departmental Quarters for Customs & Excise Department |
75 |
75 |
Yes |
|
Notes: (a) 70/65 denotes noise criteria during normal
school days / examination period, respectively. |
||||
4.8.6
For
NSR 5, NSR 14, NSR 19 and NSR 22, the construction works of Fresh Water/Salt
Water Mainlaying (Reinstatement Works) shall be arranged and carried out during
school holidays (i.e. the section of the mainlaying alignment is 20m measured from
the school site boundary). During examination period, no mainlaying works will
be carried out within 30m (for NSR 14, NSR 19 and NSR 22) or 50m (for NSR 5)
from the school site boundary. The reduced construction noise levels at these
NSRs during normal school days / examination period have been quantitatively
assessed and the calculation is presented in Appendix 4E.
4.8.7
For
NSR13 and NSR20, the concrete lorry mixer shall be located 10 m away from the
residential site boundary during the construction works of Fresh Water/Salt
Water Mainlaying (Reinstatement Works).
4.8.8
The
mitigated noise levels at the representative NSRs were calculated and the
results are summarised in Table
4‑10 with details of the calculations
given in Appendix
4E. With the adoption of
recommended mitigation measures, the construction noise level at the
representative NSRs will comply with the required noise criteria.
Table 4‑10 Predicted
Construction Noise Levels (Mitigated Scenario 2)
|
NSR No. |
Description |
Maximum Predicted Noise Level, dB(A) |
Noise Criteria, Leq, 30min, dB(A) |
Compliance |
|
NSR
1 |
Block B, Peninsula
Heights |
71 |
75 |
Yes |
|
NSR
2 |
Block 1, Meridian Hill |
72 |
75 |
Yes |
|
NSR 3 |
Chun Sing
House, Tin Ma Court |
66 |
75 |
Yes |
|
NSR 4 |
Chun Wai
House, Tin Ma Court |
67 |
75 |
Yes |
|
NSR 5 |
Grace
Methodist Church Kindergarten |
69/65* |
70/65(a) |
Yes |
|
NSR 6 |
Wang King
House, Tin Wang Court |
72 |
75 |
Yes |
|
NSR 7 |
Block 6,
Tsui Chuk Garden |
63 |
75 |
Yes |
|
NSR 8 |
Baptist
Rainbow Primary School |
63 |
70/65 (a) |
Yes |
|
NSR 9 |
Pang Ching
Court |
64 |
75 |
Yes |
|
NSR 10 |
Chung Yuen
House, Chuk Yuen North Estate |
68 |
75 |
Yes |
|
NSR 11 |
Wah Yuen
House, Chuk Yuen South Estate |
69 |
75 |
Yes |
|
NSR 12 |
Mui Yuen
House, Chuk Yuen North Estate |
65 |
75 |
Yes |
|
NSR 13 |
Our Lady of
Maryknoll Hospital |
74** |
75 |
Yes |
|
NSR 14 |
Our Lady's
College |
68/64* |
70/65 (a) |
Yes |
|
NSR 15 |
Evangel
Children's Home |
75 |
75 |
Yes |
|
NSR 16 |
Wing Shing
House |
75 |
75 |
Yes |
|
NSR 17 |
Ying Fuk
Court |
59 |
75 |
Yes |
|
NSR 18 |
Diamond Hill
Kwong Yum Home for the Aged |
71 |
75 |
Yes |
|
NSR 19 |
St.
Bonaventure College and High School |
68/64* |
70/65 (a) |
Yes |
|
NSR 20 |
Wu York Yu
Health Centre |
70** |
75 |
Yes |
|
NSR 21 |
Twghs Wong
Tai Sin Hospital |
63 |
75 |
Yes |
|
NSR 22 |
Ho Lap
Primary School |
66/64* |
70/65 (a) |
Yes |
|
NSR 23 |
Lok Shing
House, Tsz Lok Estate |
66 |
75 |
Yes |
|
NSR 24 |
Fat Chong
Temple |
58 |
75 |
Yes |
|
NSR 25 |
Wo Tin House |
71 |
75 |
Yes |
|
NSR 26 |
CCC Kei Tsz
Primary School |
64 |
70/65 (a) |
Yes |
|
NSR P1 |
Proposed Departmental
Quarters for Customs & Excise Department |
75 |
75 |
Yes |
|
Notes: (a) 70/65
denotes noise criteria during normal school days / examination period,
respectively. * Implementation of mitigated scenario 1 and no mainlaying works will be
carried out within 30m (for NSR 14, NSR 19 and NSR 22) or 50m (for NSR 5)
from the school site boundary during examination period. **
Implementation of mitigated scenario 1 and the concrete lorry mixer shall be
located 10 m away from the residential site boundary during the construction
works of Fresh Water/Salt Water Mainlaying (Reinstatement Works). |
||||
4.8.9
Good
construction site practice and noise management can considerably reduce the
potential noise impact of the construction activities on nearby NSRs. The noise benefits of these practices can
vary according to specific site conditions and operations. Since the effect of the good construction
site practices could not be quantified, the mitigated noise levels calculated
in the subsequent sections have not taken account of this effect. The following site practices should be
followed during the construction of the Project:
·
Only
well-maintained plant should be operated on-site and plant will be serviced
regularly during the construction phase;
·
Silencers or
mufflers on construction equipment should be utilised and should be properly
maintained during the construction phase;
·
Mobile plant,
if any, should be sited away from NSRs;
·
Machines and
plant (such as trucks) that may be in intermittent use should be shut down
between work periods or will be throttled down to a minimum;
·
Plant known
to emit noise strongly in one direction should be orientated so that the noise
is directed away from the nearby NSRs;
·
Material
stockpiles and other structures should be effectively utilised in screening
noise from on-site construction activities;
·
The
contractor should devise, arrange methods of working and carrying out the works
in such manner as to minimise noise impacts on the surrounding environment, and
should provide experience personnel with suitable training to ensure that all
these measures are implemented properly; and
·
The
contractor should minimise construction noise exposure to the school
(especially during examination periods) as much as possible. The contractor should liaise with the school
and Examination Authority to ascertain the exact dates and times of all
examination periods during the course of the contract and to avoid noisy
activities during these periods.
4.8.10
With
the fixed plant properly designed to meet the maximum permissible SWLs, no
adverse operational noise impact is envisaged. The following noise reduction
measures are recommended to be considered during the detailed design of the
Project.
·
Choose
quieter plant;
·
Include noise
levels specification when ordering new mechanical equipment such as pumps and
ventilation systems;
·
Locate fixed
plant, louvres or openings away from NSRs;
·
Locate fixed
plant in walled plant rooms or in specially designed enclosures;
·
Ensure pump
room doors and tunnel portal doors are kept closed;
·
Silencers,
acoustic louvres or acoustic doors should be used where necessary; and
·
Develop and
implement a regularly scheduled plant maintenance programme so that equipment
is properly operated and serviced in order to maintain controlled level of
noise. The programme should be implemented by properly trained personnel.
4.9.1
There
are two concurrent projects potentially causing cumulative noise impacts during
construction phase and their locations are shown in Figure 2.5. They include:
·
Highways
Department - CE 28/2017 (HY) - Pedestrian Link near Chuk Yuen North Estate –
Design and Construction
·
Highways
Department - CE 48/2018 (HY) – Improvement of Lion Rock
Tunnel
4.9.2
According
to the best available information, the project “Pedestrian Link near Chuk Yuen
North Estate” will commence in mid-2023 for completion in mid-2029. As the
noise assessment for this concurrent project is not available in publicity, the
EIA report of a similar project “Elevated Pedestrian Corridor in Yuen Long Town
connecting with Long Ping Station” (AEIAR-200/2016) has been referenced and the
maximum SWL of a construction activity has been used for cumulative impact assessment
as conservative approach. The predicted cumulative CNLs for the NSRs are
summarised in Table 4‑11
and the calculation for the cumulative impact assessment is provided in Appendix
4F.
4.9.3
EIA
study brief (ESB-323/2019) of the project “Improvement of Lion Rock Tunnel” was
issued in November 2019. Based on the latest information, the target work
commencement date of the project “Improvement of Lion Rock Tunnel” is mid of
2024, which is a concurrent project with this Project during construction. Tunnel
construction and re-provision of tunnel buildings of the tunnel project are
expected to be out of 300m from NSRs of this Project. Road widening works and
re-provision of footbridge of the tunnel project would be the major
construction works potentially causing noise cumulative impacts with this
Project to some of the identified NSRs (i.e. NSR 1, NSR 2 and NSR 3). As the EIA report for the tunnel project is not
yet available, the EIA report of a similar project “Tseung Kwan O - Lam Tin
Tunnel and Associated Works” (AEIAR-173/2013) has been referenced and the
maximum SWL of a relevant construction activity has been used for cumulative
impact assessment as conservative approach. The predicted cumulative CNLs for
the NSRs are summarised in Table 4‑11
and the predicted cumulative CNLs for the NSRs calculation for the cumulative
impact assessment is provided in Appendix
4F.
Table 4‑11 Predicted Cumulative
Construction Noise Levels
|
NSR No. |
Description |
Max. Predicted
Mitigated CNL for Concurrent Project, dB(A) |
Max. Predicted
Mitigated CNL for this Project, dB(A) |
Max. Predicted
Mitigated Cumulative CNL, dB(A) |
Noise Criteria, Leq,
30min, dB(A) |
Compliance |
|
Concurrent Project - Pedestrian Link near Chuk Yuen North
Estate |
|
|||||
|
NSR 12 |
Mui Yuen House, Chuk
Yuen North Estate |
73 |
65 |
73 |
75 |
Yes |
|
NSR 13 |
Our Lady of Maryknoll
Hospital |
61 |
74 |
74 |
75 |
Yes |
|
NSR 14 |
Our Lady's College |
57 |
68 / 64 |
68 / 65 |
70/65 (a) |
Yes |
|
NSR 15 |
Evangel Children's Home |
62 |
75 |
75 |
75 |
Yes |
|
NSR 16 |
Wing Shing House |
52 |
75 |
75 |
75 |
Yes |
|
NSR 17 |
Ying Fuk Court |
55 |
59 |
60 |
75 |
Yes |
|
NSR 18 |
Diamond Hill Kwong Yum
Home for the Aged |
59 |
71 |
71 |
75 |
Yes |
|
NSR 19 |
St. Bonaventure College
and High School |
53 |
68 / 64 |
68 / 65 |
70/65 (a) |
Yes |
|
NSR 20 |
Wu York Yu Health Centre |
51 |
70 |
70 |
75 |
Yes |
|
NSR 21 |
Twghs Wong Tai Sin
Hospital |
53 |
63 |
63 |
75 |
Yes |
|
NSR 22 |
Ho Lap Primary School |
49 |
66 / 64 |
66 / 64 |
70/65 (a) |
Yes |
|
NSR P1 |
Proposed Departmental
Quarters for Customs & Excise Department |
50 |
75 |
75 |
75 |
Yes |
|
Concurrent Project - Improvement of Lion Rock Tunnel |
|
|||||
|
NSR 1 |
Block B, Peninsula
Heights |
72 |
71 |
74 |
75 |
Yes |
|
NSR 2 |
Block 1, Meridian Hill |
65 |
72 |
73 |
75 |
Yes |
|
NSR 3 |
Chun Sing House, Tin Ma
Court |
61 |
66 |
67 |
75 |
Yes |
|
Notes: (a)
70/65 denotes noise criteria during normal school days /
examination period, respectively. |
||||||
4.9.4
The
predicted cumulative CNL at all NSRs within 300m of the concurrent project will
comply with noise criteria. No unacceptable cumulative noise impact is
anticipated.
4.9.5
There
is an existing Ma Chai Hang Pumping Station located in approximately 48m to the
north of the proposed ancillary building. The location of the pumping station
is shown in Figure 4.3.
Cumulative noise impact from the existing Ma Chai Hang Pumping Station and the
proposed ancillary building has been taken into account in this cumulative
assessment. As the detailed information and noise data of the fixed plants for
the pumping station is not available, the SWL of the fixed plants for Pui O No.
2 Raw Water Pumping Station in the EIA Report of “Siu Ho Wan Water Treatment
Works Extension” (AEIAR-082/2004) has been referenced for this cumulative
impact assessment.
4.9.6
The
cumulative noise level of the fixed plants in the proposed ancillary building
together with the existing Ma Chai Hang Pumping Station are summarised in Table 4‑12. The predicted cumulative fixed plant noise
levels at all the representative NSRs comply with the day-time and night-time
noise criteria under the NCO during operation phase. Details of the calculation are provided in Appendix
4G.
Table 4‑12 Predicted
Cumulative Fixed Plant Noise Levels
|
NSR |
Description |
Predicted Cumulative
Fixed Plant Noise Level, dB(A) |
ASR |
Applicable Noise Limit,
dB(A) |
Compliance |
|
NSR 1 |
Block B, Peninsula
Heights |
55 |
C |
60 |
Yes |
|
NSR 2 |
Block 1, Meridian Hill |
55 |
C |
60 |
Yes |
|
NSR 3 |
Chun Sing House, Tin Ma
Court |
52 |
B |
55 |
Yes |
|
NSR 4 |
Chun Wai House, Tin Ma
Court |
52 |
B |
55 |
Yes |
|
NSR 5 |
Grace Methodist Church
Kindergarten |
52 |
B |
55 |
Yes |
|
NSR 6 |
Wang King House, Tin
Wang Court |
51 |
B |
55 |
Yes |
|
NSR 7 |
Block 6, Tsui Chuk
Garden |
52 |
B |
55 |
Yes |
4.10.1
With
the implementation of the recommended mitigation measures, it is predicted that
there is no exceedance of the daytime construction noise criteria at the NSRs. Hence, no adverse residual noise
impact is anticipated.
4.10.2
No
adverse residual impact is expected during operation of the Project.
4.11.1
Noise monitoring and weekly site audit are proposed
to be carried out during construction phase. The recommended mitigation measures, monitoring procedures and
locations are presented in detail in the Environmental Monitoring and Audit
(EM&A) Manual. This will facilitate
the contractor to have early warning and undertake the necessary actions to
reduce noise emissions at specific areas.
The effectiveness of on-site control measures could also be evaluated
through the regular site audits. All the
recommended mitigation measures should be incorporated into the EM&A
programme for implementation during construction.
4.11.2
As no adverse noise impact arising from the
operation phase of the Project is anticipated with the implementation of the
noise reduction measures as recommended in Section
4.8.10, noise monitoring for the operation of relocated
pumping stations and ancillary facilities is not required during the operation
phase.
4.12.1
The use of powered mechanical equipment during the
construction phase of the Project is expected to create noise impact to the
nearby NSRs. Assessment indicates that the construction noise impact can be
mitigated to the criteria in the EIAO-TM by use of quiet construction
equipment, erecting noise barriers / enclosures and use
of quieter construction method restrictions on construction works near schools,
avoid operating concrete lorry mixer close to some identified noise sensitive
receivers, etc. as recommended in Section 4.8. With the implementation of the
recommended mitigation measures, no exceedance of the daytime construction
noise criteria is expected.
4.12.2
The
maximum permissible sound power levels for the ancillary facilities have been
derived as noise design target. With implementation of recommended mitigation
measures, fixed noise from operation of the Project will comply with the
relevant noise criteria.
1
Environmental
Protection Department (1989), A Practical Guide for the Reduction of Noise from
Construction Works
2
EIA
Report of "West Island Line” (AEIAR-126/2008)
3
EIA
report of “Elevated Pedestrian Corridor in Yuen Long Town connecting with Long
Ping Station” (AEIAR-200/2016)
4
EIA
report of “Tseung Kwan O - Lam Tin Tunnel and Associated Works”
(AEIAR-173/2013)
5
EIA
Report of “Siu Ho Wan Water Treatment
Works Extension” (AEIAR-082/2004)
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