Chapter 5 – Noise ImpAct Assessment
CONTENTS
5.2 Environmental Legislation and Guidelines
5.4 Identification of Potential Noise Impacts
5.6 Prediction and Evaluation of Noise Impacts
5.7 Proposed Noise
Mitigation Measures
5.8 Assessment of Noise Impacts with the Application of Mitigation Measures
5.10 Environmental Monitoring and Audit
List of Tables
Table 5‑1 Area
Sensitivity Rating Criteria Specified in the GW-TM
Table 5‑2 Basic
Noise Levels (in Leq,30min, dB(A))
Table 5‑3 Acceptable
Noise Levels for Percussive Piling Specified in the PP-TM
Table 5‑4 Acceptable
Noise Level during Operational Phase
Table 5‑5 Road
Traffic Noise Assessment Criteria Specified in the EIAO-TM
Table 5‑6 Summary
of the Identified Existing and Planned NSRs near the Project
Table 5‑7 Identified
Area Sensitivity Ratings of NSRs
Table 5‑9 Summary
of Selected Noise Assessment Points at Each Representative NSR
Table 5‑10 PME
identified as Major Noise Sources
Table 5‑11 Summary
of Workshop Equipment and Repair Activity
Table 5‑12 Estimated
Quantity of Identified Fixed Plant Noise Sources
Table 5‑13 Summary
of Anticipated Works of XRL
Table 5‑16 Summary
of Predicted Operational Levels at NSRs
Table 5‑17 Year
2017 Traffic Forecast
Table 5‑18 Year
2032 Traffic Forecast
Table 5‑23 Maximum
SWLs for Selected “Quiet” and Alternative Plants
List of Figures
Figure 5-1 Locations of Project Boundary and Identified
Noise Sensitive Receivers (NSRs)
Figure 5-2 Locations of Background Noise Measurements
Figure 5-3 Locations of Assessment Points of Each NSRs
Figure 5-4 Locations
of Works Front, NSRs and Corresponding Notional Points for
NSRs
Appendix 5-1 Corresponding
MLP of Planned Development at Nam Cheong Station and Correspondence with MTRC
Appendix 5-2 Photographs of
the Identified existing NSRs
Appendix 5-3 Split Type A/C
Observed at NSR1 and NSR2
Appendix 5-4 Construction
Programme
Appendix 5-5 Latest Layout
and Elevation Plan
Appendix 5-6 Photos of
Identified Workshop Vehicle Repair Activities
Appendix 5-7 Summary of
Estimated Off-site Traffic Generation (Inbound and Outbound) from FEHD Depot
and Summary of Traffic Forecast
Appendix 5-8 Detailed Calculation
of Construction Noise Impact Assessment and Complete PME Inventory (Unmitigated
Scenario)
Appendix 5-9 Construction
Noise Levels due to XRL project according to AEIAR-143/2009
Appendix 5-10 Detailed
Calculation of Fixed Plant Noise Impact Assessment
Appendix 5-11 Detailed
Calculations of Construction Noise Impact Assessment and Complete PME Inventory
(Mitigated Scenario)
5.1.1
Potential noise impact arising from the
Project would be contributed by both construction and operation phases. This Chapter summarises the identified
potential sources of noise impact during both phases, details of noise impact
assessment and, where necessary, the recommended noise mitigation measures to
reduce the identified noise impacts to the acceptable levels.
5.2
Environmental
Legislation and Guidelines
Construction
Phase
5.2.1
In Hong Kong, control of construction noise is carried out under the
Noise Control Ordinance (NCO) and the two subsidiary Technical Memoranda on
Noise from Percussive Piling (PP-TM) and Noise from Construction Work
Other Than Percussive Piling (GW-TM).
Construction Noise Permit (CNP) is required for carrying out percussive
piling at daytime on a day not being a general holiday and general construction
works during restricted hours (i.e. 1900 to 0700 hours on a day not being a
general holiday and at any time on a general holiday). In addition, there are
provisions under the Environmental Impact Assessment Ordinance (EIAO) and the
associated Technical Memorandum (EIAO-TM) for assessing the impacts from
construction activities during 0700 to 1900 hours on a day not being a general
holiday.
5.2.2
The Technical Memorandum on Noise from Construction Work in
Designated Areas (DA-TM) deals with the control of noise generated by
Specified Powered Mechanical Equipment (SPME) and Prescribed Construction Works
(PCWs) in identified designated areas. SPME includes hand-held breaker,
bulldozer, concrete lorry mixer, dump truck and hand-held poker vibrator; PCWs
include erection/dismantling of formwork/scaffolding, loading/unloading or
handling of rubble, wooden boards, steel bars, wood or scaffolding material,
and hammering. Since the Yen Ming Road
Site Boundary is within the designated area, CNP would be required for this
section of the Project for carrying out PCWs and construction works involving
the use of SPME during restricted hours (i.e. 1900 to 0700 hours and anytime on
a general holiday).
5.2.3
The NCO criteria for the control of noise from Powered Mechanical
Equipment (PME) are dependent on the Area Sensitivity Ratings for the Noise
Sensitive Receivers (NSRs). Area
Sensitivity Rating is a function of the type of area within which the NSRs are
located and the degree of the effect on the NSRs of particular Influencing
Factors (IFs). Categorization of Area
Sensitivity Ratings is shown in Table 5-1. In this EIA report,
the Area Sensitivity Rating for the NSRs is determined to be “C” in general due
to influencing factor of heavily trafficked West Kowloon Corridor. Despite any
description or assessment made in this EIA report on construction noise
aspects, there is no guarantee that a CNP will be issued for the construction
of the Project. The Noise Control Authority will consider a well-justified CNP
application, once filed, for construction works within restricted hours as
guided by the relevant Technical Memoranda issued under the NCO. The Noise Control Authority will take account
of contemporary conditions / situations of adjoining land uses and any previous
complaints against construction activities at the site before making his
decision in granting a CNP. Nothing in
this EIA report shall bind the Noise Control Authority in making his decision. If a CNP is to be issued, the Noise Control
Authority shall include in it any condition he thinks fit. Failure to comply with any such conditions
will lead to cancellation of the CNP and prosecution action under the NCO.
Table 5‑1 Area
Sensitivity Rating Criteria Specified in the GW-TM
|
Type of area containing the NSR |
Degree to which NSR is
affected by IF |
||
|
Not Affected [1] |
Indirectly Affected [2] |
Directly Affected [3] |
|
|
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:
1. “Not Affected” means that the NSR is at such a
location that the noise generated by the influencing factors [4]
(IFs) is not noticeable at the NSR.
2. “Indirectly Affected” means that the NSR is at such
a location that the noise generated by the IF, whilst noticeable at the NSR, is
not a dominant feature of the noise climate of the NSR.
3. “Directly Affected” means that the NSR is in such a
location that the noise generated by the IF is readily noticeable at the NSR
and is a dominant feature of the noise climate of the NSR.
4. “IF” is defined as any industrial area, major road
or the area within the boundary of Hong Kong International Airport. The term
“major road” means a road which has a heavy and generally continuous flow of
vehicular traffic and, in normal circumstances, means a road with an annual
average daily traffic flow in excess of 30,000.
5.2.4
Construction activities of proposed developments will be planned and
controlled in accordance with the NCO, GW-TM, DA-TM and PP-TM. Works requiring the use of PME during
restricted hours and particularly at night will be carried out under the
provision of a CNP and planned to achieve the required Acceptable Noise Levels
(ANLs). The basis of the ANLs, i.e. the Basic Noise Levels
(BNLs) are shown in Table 5-2.
Table 5‑2 Basic
Noise Levels (in Leq,30min, dB(A))
|
Time Period |
Area Sensitivity Rating |
||
|
A |
B |
C |
|
|
All days during the
evening (1900 to 2300 hours) and general holidays (including Sundays) during
the day and evening (0700 to 2300 hours) |
60 (45) |
65 (50) |
70 (55) |
|
All days during the
night-time (2300 to 0700 hours) |
45 (30) |
50 (35) |
55 (40) |
Notes:
·
BNLs in brackets
apply to SPME and PCW specified in the DA-TM.
·
The BNLs should be
corrected to obtain the ANLs according to the relevant TM
5.2.5
For constructions carried out on a day not being a general holiday,
daytime period (i.e. 0700 to 1900 hours), noise standard of 75 dB(A) Leq,30
min, as stipulated in Table 1B, Annex 5 of the EIAO-TM, is adopted
for this assessment for all domestic premises including temporary housing
accommodations and hostels. For schools, a daytime noise standard of 70 dB(A) Leq,30 min, lowered to 65 dB(A) Leq,30
min during examination periods, is adopted. These standards apply to
uses which rely on opened windows for ventilation.
5.2.6
Subsidiary regulations of the NCO include the Noise Control (Hand
Held Percussive Breakers) and Noise Control (Air Compressors) Regulations,
which require compliance with relevant noise emission standards and the fixing
of noise emission labels to specified plants and equipment. While these requirements are not directly
relevant to the construction noise impact assessment, contractors must meet
them during the construction phase of the Project.
5.2.7
Percussive piling is prohibited between 1900 and 0700 hours on a day
not being a general holiday and at any time on a general holiday. A CNP is required for carrying out of
percussive piling between 0700 and 1900 hours on a day not being a general
holiday. The PP-TM sets out the requirements for working and determination of
the permitted hours of operations. ANLs criteria for percussive piling are
shown in Table 5-3.
Table 5‑3 Acceptable
Noise Levels for Percussive Piling Specified in the PP-TM
|
Architectural Characteristics of NSR |
ANL, Leq,30min dB(A) |
|
No windows or other
openings |
100 |
|
With central air
conditioning system |
95 |
|
With windows or other
openings but without central air conditioning system |
85 |
Note: 10 dB(A)
should be subtracted from the ANLs shown above for NSRs which are hospitals,
medical clinics, educational institutes, courts of laws or other NSRs which are
considered by the Authority to be particularly sensitive to noise.
Operation Phase
Fixed Plant Noise
5.2.8
The NCO and Technical
Memorandum for the Assessment of Noise from Places other than Domestic
Premises, Public Places or Construction Sites (IND-TM) control operational
noise from places or premises other than domestic premises, public places or
construction sites. For the assessment of impacts from these noise sources, the
Area Sensitivity Ratings (ASR) of the NSRs should be determined in accordance
with the IND-TM, and thus to figure out
the appropriate ANL according to the ASR. There are four types of areas
described in the IND-TM which are summarised in Table 5-1 in above Section
5.2.3.
5.2.9
The ANL based upon the different ASRs are shown in Table 5-4 below.
Table 5‑4 Acceptable
Noise Level during Operational Phase
|
Time
Period |
ASR
of “A” |
ASR of “B” |
ASR of “C” |
|
Daytime
and Evening (0700-2300 hours) |
60 |
65 |
70 |
|
Night-time
(2300-0700 hrs) |
50 |
55 |
60 |
5.2.10
According to the EIAO-TM, noise standards for planning purposes for
fixed noise sources are determined with the following criteria:
(a)
5dB(A) below the appropriate Acceptable Noise
Levels (ANL) shown in Table 3 of the IND-TM (i.e. Table 5-4), or
(b)
The prevailing background noise levels (for
quiet areas with level 5 dB(A) below the ANL)
5.2.11
In order to obtain prevailing background noise levels, surveys have
been conducted on 4 and 17 July 2012. The measured background
noise levels and determined assessment criteria for each NSR will be detailed
in Section 5.3.
Traffic Noise
5.2.12
Road traffic noise criteria are listed in Table 1A, Annex 5 of the
EIAO-TM, which provides guidance on acceptable road traffic noise levels at
various types of noise sensitive buildings.
The relevant criteria are shown in Table
5-5. These standards apply to uses
which rely on opened windows for ventilation.
Table 5‑5 Road
Traffic Noise Assessment Criteria Specified in the EIAO-TM
|
Uses |
Road Traffic Noise Assessment Criteria –
Peak Hour Traffic (L10,(1-hour)) / dB(A) |
|
Domestic
Premises |
70 |
|
Hotels
and Hostels |
70 |
|
Offices |
70 |
|
Educational
Institutions |
65 |
|
Places
of public worship and courts of law |
65 |
|
Hospitals,
clinics, convalescences and homes for the aged, diagnostic rooms, wards |
55 |
Note: The above standards apply to uses
which rely on opened windows for ventilation.
5.2.13
To ascertain the off-site traffic noise impact caused by the
operation of the depot, a comparison of traffic noise levels during AM peak and
PM peak of FEHD depot off-site traffic for the “with
project” and “without project” scenarios is required. Noise contribution from
the FEHD depot is considered as insignificant when the difference is less than 1.0dB(A).
5.3.1
NSRs have been identified in accordance with
Annexes 5 and 13 of the EIAO-TM which can include domestic premises, temporary housing
accommodation, educational institutions, nurseries, hospitals, medical clinics,
homes for the aged, convalescent homes, places of public worship, libraries,
courts of law, performing arts centres, having direct line-of-sight and
substantial angle of view to the Project Area. Sensitive receivers present
within the 300m study area boundary have been identified.
5.3.2
Besides, a planned residential development on
Nam Cheong Station has been identified at the commencement of the assessment.
Details of the planned development including floor plan and number of floors
have been referenced to the latest approved Master Layout Plan (MLP approved in
Town Planning Application A/K20/119). In accordance with information provided by
the MTRC, construction of the development has been commenced and the
anticipated completion of the whole Development would be no later than Year
2019. Corresponding
MLP of Planned Development at Nam Cheong Station and correspondence with MTRC
are enclosed in Appendix 5-1.
5.3.3
Figure 5-1 illustrates
the Project boundary together with identified Noise Sensitive Receivers.
Details of the identified existing and planned NSRs are summarized in Table 5-6. Photographs of the
identified existing NSRs are shown in Appendix
5-2.
Table 5‑6 Summary
of the Identified Existing and Planned NSRs near the Project
|
NSR |
Name of
Building |
Use |
No. of
Floor |
Approximate
Distance from the Project Site |
Remarks |
|
1 |
Sir Ellis Kadoorie Secondary School (West
Kowloon) |
Education Institute |
8 |
100m |
Split type A/C were noted on site |
|
2 |
Tai Kok Tsui
Catholic Primary School (Hoi Fan Road) |
Education Institute |
8 |
180m |
Split type A/C were noted on site |
|
3 |
Hampton Place |
Residential |
48 |
290m |
/ |
|
4 |
Nam Cheong Estate Block 6 Cheong Chit House |
Residential |
15 |
260m |
/ |
|
5 |
Nam Cheong Estate Block 5 Cheong Yat House |
Residential |
15 |
250m |
/ |
|
6 |
Nam Cheong Estate Block 4 Cheong Shun House |
Residential |
15 |
290m |
/ |
|
7 |
Fu Cheong Estate Fu Yun House |
Education / Homes for the Aged |
5 |
270m |
/ |
|
8 |
Planned Residential Development on Nam Cheong Station |
Residential |
9 |
110m |
Anticipated Completion no later than Year 2019 |
|
40 |
160m |
5.3.4
In addition, according to the site visit
observation dated 4 July and 17 July 2012, spilt-type air-conditioners (A/C) have
been installed at Sir Ellis Kadoorie Secondary School
(West Kowloon) and Tai Kok Tsui
Catholic Primary School (Hoi Fan Road). Appendix
5-3
shows the existing split type A/C of NSR 1 and NSR 2.
5.3.5
Notwithstanding the provision of spilt-type
air-conditioners, since it is also possible for the schools abovementioned to
rely on opened window ventilation, all schools within the Noise Assessment Area
are still considered as NSRs for noise impact assessment.
Area Sensitivity
Rating of Noise Sensitive Receivers
5.3.6
According to the latest Outline Zoning Plan
(OZP) in the Nam Cheong, there is an existing industrial zoning area at
south-west to the Project. By site observation, the industrial area was an open
storage for cargo transfer station which operates 24-hour as advised by the
staff. Therefore, the open storage is considered to be
an influencing factor (IF).
5.3.7
As per the Annual Traffic Census (ATC) of
2011 by Transport Department, the Annual Average Daily Traffic (AADT) of West
Kowloon Highway (WKH) is about 74,000 vehicles, as such WKH is considered as an
IF in accordance with Technical Memorandum for the Assessment of Noise from
Places other than Domestic Premises, Public Places or Construction Sites
(IND-TM).
5.3.8
NSRs 1 and
2 are located at “Area other than those above” mentioned in Table 5-1 which are directly affected
by the IFs (OZP Industrial Zone and WKH). Therefore,
an ASR of C would be allocated.
5.3.9
NSRs 3 to 8 are located within the urban area
of Nam Cheong which are indirectly / directly affected
by the IF (WKH). Therefore, an ASR of C would be allocated.
5.3.10
The identified Area Sensitivity Ratings of
NSRs are tabulated in Table 5-7.
Table
5‑7 Identified
Area Sensitivity Ratings of NSRs
|
NSR |
Name of Building |
Influencing Factor (IF) |
Directly / Indirectly Affected |
Identified ASR |
|
1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
OZP
Industrial Zone & West Kowloon Highway |
Directly |
C |
|
2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
West
Kowloon Highway |
Directly |
C |
|
3 |
Hampton
Place |
West
Kowloon Highway |
Indirectly |
C |
|
4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
West
Kowloon Highway |
Indirectly |
C |
|
5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
West
Kowloon Highway |
Indirectly |
C |
|
6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
West
Kowloon Highway |
Indirectly |
C |
|
7 |
Fu
Cheong Estate Fu Yun House |
West
Kowloon Highway |
Indirectly |
C |
|
8 |
Planned
Residential Development on Nam Cheong Station |
West
Kowloon Highway |
Directly |
C |
5.3.11
Besides the identification of ASR in IND-TM,
more stringent criteria for assessing fixed plant noise are stipulated in the
EIAO-TM for planning purpose. The stipulated assessment criteria:-
·
Criteria 1: 5 dB(A) below the appropriate
ANL shown in Table 3 of IND-TM; or
·
Criteria 2: the prevailing
background noise levels (for quiet areas with level 5 dB(A) below the ANL)
5.3.12
In order to determine the appropriate
assessment criteria, prevailing background noise survey at the NSRs have been
conducted on 4 and 17 of July 2012. The measured
background noise levels and the recommended fixed plant noise assessment
criteria are shown in Table 5-8 and
the geographical locations are shown in Figure
5-2.
Table 5‑8 Measured
Prevailing Background Noise Levels for NSRs and Recommended Fixed Plant Noise
Assessment Criteria
|
NSR |
Representative Background Noise
Measurement Locations |
Measured Background Noise Levels (Leq,30mins)
/ dB(A) |
ANL – 5 / dB(A) |
Recommended Fixed Plant Noise Assessment
Criteria (Leq,30mins) / dB(A) |
|||
|
Daytime |
Nighttime |
Daytime |
Nighttime |
Daytime |
Nighttime |
||
|
1 |
NML 1 |
64.7 |
NA |
65 |
NA |
65 |
NA |
|
2 |
NML 2 |
62.1 |
NA |
65 |
NA |
62 |
NA |
|
3 |
NML 3 |
65.6 |
56.7 |
65 |
55 |
65 |
55 |
|
4 |
NML 4 |
66.3 |
58.9 |
65 |
55 |
65 |
55 |
|
5 |
NML 4 |
66.3 |
58.9 |
65 |
55 |
65 |
55 |
|
6 |
NML 5 |
66.1 |
63.4 |
65 |
55 |
65 |
55 |
|
7 |
NML 6 |
68.1 |
63.4 |
65 |
55 |
65 |
55 |
|
8 |
NA[1] |
NA |
NA |
65 |
55 |
65 |
55 |
Remark:
[1] Planned
Residential Development on Nam Cheong Station (NSR 8) shall be constructed
above the non-domestic podium of 27mPD or 20m above ground, which will be
equivalent to the elevation of the existing roof level of Nam Cheong Station.
Due to the safety concern, request to conduct background noise survey at that
elevated position was rejected. On the
other hand, it was considered not appropriate to conduct background noise
survey at the ground level fronting Nam Cheong Station, as ground level does
not have direct line-of-sight to the West Kowloon Highway, which is identified
to be the dominant prevailing noise source of the concerned development due to
its heavy on-road traffic. Therefore, background noise level measurement is not
available.
5.3.13
Noise assessment points are selected at each
identified NSR in the Project. Details of the selected noise assessment
points are summarised in Table 5-9.
And the locations are illustrated in Figure
5-3 for operational noise impact assessments and in Figure 5-4 for construction noise impact assessments.
Table 5‑9 Summary
of Selected Noise Assessment Points at Each Representative NSR
|
NSR
ID |
Description |
Land
Use |
No.
of Noise Sensitive Storeys above Podium/Site Level |
Podium
(P)/Site Level (S) (mPD) |
No.
of Noise Assessment Points at Each Floor |
|
1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
Education
Institute |
8 |
5.6 (S) |
3 |
|
2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
Education
Institute |
8 |
5.5 (S) |
3 |
|
3 |
Hampton
Place |
Residential |
48 |
14.8
(P) |
1 |
|
4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
Residential |
15 |
5.2 (S) |
1 |
|
5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
Residential |
15 |
5.2 (S) |
1 |
|
6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
Residential |
15 |
5.2 (S) |
1 |
|
7 |
Fu
Cheong Estate Fu Yun House |
Education
/ Homes for the Aged |
5 |
16.2
(P) |
1 |
|
8 |
Planned
Residential Development on Nam Cheong Station |
Residential |
9 |
26.4
(P) |
2[1] |
|
|
40 |
3[1] |
Remark:
[1]
Noise assessment points of N801 to N805 in Figure
5-3 are selected for operational noise impact assessments. Noise assessment
points of N811 to N815 in Figure 5-4
are selected for construction noise impact assessment.
5.4
Identification
of Potential Noise
Impacts
Construction
Phase
5.4.1
The potential sources of noise impact during
the construction phase of the Project would be the use of Powered Mechanical
Equipment (PME) for various construction activities. As broadly indicated
in construction programme in Appendix
5-4, the construction of the project would be tentatively starts from end 2014 and lasts for about 25 months. Location of notional noise
sources are provided in Figure 5-4. The key construction noise activities
include:
-
Site mobilisation and
hoarding
-
Foundation
-
Superstructure
-
Finishes
5.4.2
Foundation construction will adopt driven
H-pile, which is kind of percussive piling as controlled under “Technical
memorandum on Noise from Percussive Piling” under Noise Control Ordinance,
would be adopted for foundation construction. Since the issuance of a CNP by
the Noise Control Authority would depend on the submission of an application by
the contractor, and on the contractor’s compliance with the percussive piling
noise limits set out within the PP-TM, the assessment of this type of noise are
thus not to be included in this EIA Report, and it is upon the authority to
make final judgment in granting of CNP and this report make no binding effect
to the authority in executing of NCO. However, other auxiliary PME for the
piling works, other than the hydraulic hammer driving rig for steel pile,
including mobile crane, generator for welder and generator will be included in
construction noise impact assessment to reflect construction noise from these
PMEs.
5.4.3
The key PME to be used for the construction
works activities are shown in Table 5-10.
In order to provide a realistic assessment of the works activities, the
percentages of time that PME will be operating on site have also been
considered when calculating the cumulative Sound Power Levels (SWL) for the
construction activities. The noise levels at the NSRs have been assessed on a
monthly basis in respect to the individual noise levels induced by the
construction works activities, assuming they are operating cumulatively.
Table 5‑10 PME
identified as Major Noise Sources
|
PME [1] |
TM or other ref. |
No. of PME |
SWL in dB(A) |
On time % |
Total SWL [2] |
|
1-1
Site
Mobilisation and Hoarding |
|||||
|
Loader,
wheeled (Back-hoe) (All) |
CNP
081 |
1 |
112 |
50 |
115.3 |
|
Excavator, Tracked (All) |
CNP
081 |
1 |
112 |
50 |
|
|
Lorry,
with crane, 5.5 tonne <GVH <= 38 tonne (All) |
Other
ref. [3] |
1 |
105 |
50 |
|
|
Generator (All) |
CNP
103 |
1 |
95 |
100 |
|
|
Breaker,
mini-robot mounted (Act 1) |
Other
ref. [3] |
1 |
115 |
50 |
|
|
Air
Compressor, air flow < 10m3/min (Act 1) |
CNP
001 |
1 |
100 |
50 |
|
|
Concrete Lorry Mixer (Act 2) |
CNP
044 |
1 |
109 |
100 |
|
|
Poker,
Vibratory, hand-held, electric (Act 2) |
Other
ref. [3] |
2 |
102 |
100 |
|
|
2-1
Piling
(Driven H Pile) |
|||||
|
Mobile
Crane (All) |
CNP
048 |
3 |
112 |
100 |
116.8 |
|
Generator,
portable (All) |
Other
ref. [3] |
1 |
100 |
50 |
|
|
Generator
(All) |
CNP
103 |
1 |
95 |
100 |
|
|
Driven
H-Pile Rig |
(Controlled
under PP-TM) |
||||
|
3-1
Superstructure
(Pile Cap Construction) |
|||||
|
Excavator, Tracked (Act 1) |
CNP
081 |
2 |
112 |
50 |
114.3 |
|
Lorry,
with crane, 5.5 tonne <GVH <= 38 tonne (Act 1) |
Other
ref. [3] |
2 |
105 |
50 |
|
|
Mobile Crane (Act 1) |
CNP
048 |
1 |
112 |
50 |
|
|
Concrete
Lorry Mixer (Act 2) |
CNP
044 |
1 |
109 |
50 |
|
|
Poker,
Vibratory, hand-held, electric (Act 2) |
Other
ref. [3] |
2 |
102 |
100 |
|
|
Bar Bender and cutter, electric (All) |
CNP
021 |
1 |
90 |
70 |
|
|
3-2 Superstructure
(Superstructure and Concreting) |
|||||
|
Lorry,
with crane, 5.5 tonne <GVH <= 38 tonne (All) |
Other
ref. [3] |
2 |
105 |
50 |
111.7 |
|
Concrete
Lorry Mixer (All) |
CNP
044 |
1 |
109 |
50 |
|
|
Concrete
Pump (All) |
CNP
047 |
1 |
109 |
50 |
|
|
Poker,
Vibratory, hand-held, electric (All) |
Other
ref. [3] |
2 |
102 |
100 |
|
|
Tower
Crane, electric (All) |
CNP
049 |
1 |
95 |
100 |
|
|
Bar
bender and cutter, electric (All) |
CNP
021 |
3 |
90 |
50 |
|
|
3-3
Finishes |
|||||
|
Drill,
hand-held, battery (All) |
Other
ref. [3] |
3 |
89 |
50 |
106.9 |
|
Jig-saw,
hand-held, wood, electric (All) |
Other
ref. [3] |
1 |
99 |
50 |
|
|
Saw,
wire (All) |
Other
ref. [3] |
2 |
101 |
50 |
|
|
Lorry,
with crane, 5.5 tonne <GVH <= 38 tonne (All) |
Other
ref. [3] |
2 |
105 |
50 |
|
Notes:
[1] The grouping of PMEs in
sub-construction task is reflected in brackets. “(ALL)” denotes that the PME
would be adopted for all sub-construction tasks in that construction activity.
“(Act 1)”, ”(Act
2)”, etc. denotes that the PME would be adopted for particular sub-construction
task of a construction activity only.
[2] Total SWL reflects the predicted
total SWL in consideration of the number of PMEs, their on-time percentage and
accounts for the inventory grouping (sub-construction tasks) contributing to
the highest noise level.
[3] PME referenced to the document
“Sound power levels of other commonly used PME”.
5.4.4
The proposed plant inventory involves the use
of Specified Powered Mechanical Equipment (SPME), as detailed in Section 5.2.2, including hand-held
breaker, concrete lorry mixer and hand-held poker vibrator. As such, should
construction works extended into restricted hours, the DA-TM will become
effective and further restriction on the acceptable noise will be imposed.
Operation Phase
5.4.5
Identified potential operational noise from
the development includes the following:
(1)
Fixed Plant Noise
i. Workshop
Vehicle Repair Activities
ii. Mechanical
Ventilation and Air Conditioning System (MVAC) and other Building Services
Equipment
(2)
Off-site Traffic Noise
Fixed Plant Noise
- Workshop Vehicle Repair Activities
5.4.6
During the operational phase, noise sources
could arise from the repair activities for the vehicles and engine noise
emission from the vehicles during commissioning tests. All of the planned
vehicle repair activities are limited to 0700 to 1900 hours only and all of
them would be carried out within “indoor” covered area on ground floor of the
development, as shown in Appendix 5-5.
5.4.7
The workshop vehicle repair activities for
the development have been validated to include:
·
Sand Blasting;
·
Grinding;
·
Hammering;
·
Roller Brake Tester;
·
Vehicle Washing;
·
Vehicle Welding;
·
Parts Welding;
·
Screw Driver; and
·
Tyre Changer.
5.4.8
Photos of the current workshop
vehicle repair activities are shown in Appendix
5-6.
5.4.9
Noise surveys were conducted on 26 June 2012
and 6 July 2012 at the existing FEHD Kwai Chung Depot and Sai
Yee Street Depot respectively to measure the operational noise level of the
equipment.
5.4.10
Noise measurements were conducted by using a
calibrated Bruel & Kjaer
Type 2260 Sound Level Meter. SWL of the noisy activity was determined taking
consideration of standard acoustic principles, as well as the methodology
presented in the International Standard
ISO 3746: Acoustics – Determination of sound power levels of noise sources
using sound pressure – survey method
using an enveloping measurement surface over a reflecting plane, and Technical Memorandum on Noise from
Construction Work other than Percussive Piling (GW-TM). Several noise
measurements were carried out for each activity and the averaged levels were
adopted for the calculation.
5.4.11
Noise data associated with operation of
vehicle washing, roller brake testing and tyre changer were obtained by making
reference to the approved EIA Reports for New
World First Bus Permanent Depot at Chai Wan (AEIAR-029/2000) and Proposed Headquarters and Bus Maintenance
Depot in Chai Wan (AEIAR-045/2001).
5.4.12
According to the “Technical Memorandum for the Assessment of Noise from Place Other Than
Domestic Premises, Public Places or Construction Sites”, correction for
tonality of each workshop equipment and repair activity have also been
considered.
5.4.13
The quantity, measured noise levels,
referenced SWL, tonality, operation duration, operation frequency of workshop
equipment and repair activity in the development are shown in Table 5-11.
Table 5‑11 Summary
of Workshop Equipment and Repair Activity
|
Item |
Activities |
Qty |
Averaged
Measured Sound Pressure Level / dB(A) |
SWL, dB(A) |
Correction
for Tonality / dB(A) |
Operation
Duration (mins) |
Operation
Frequency (per 30 mins) |
|
1 |
Sand
Blasting |
1 |
108
at 1m |
116 |
/ |
1 |
2 |
|
2 |
Grinding |
1 |
100
at 1m |
108 |
/ |
1 |
2 |
|
3 |
Hammering
(12lb Hammer) |
1 |
102
at 1m |
113[3] |
/ |
1 |
1 |
|
4 |
Roller
Break Tester |
1 |
/ |
98.6[1] |
/ |
1 |
5 |
|
5 |
Vehicle
Washing (Manual) |
1 |
/ |
88.4[2] |
/ |
30 |
1 |
|
6 |
Vehicle
Welding |
1 |
70
at 1m |
78 |
3 |
20 |
1 |
|
7 |
Parts
Welding |
1 |
80
at 1m |
88 |
/ |
5 |
4 |
|
8 |
Screw
Driver |
1 |
92
at 1m |
100 |
/ |
1 |
5 |
|
9 |
Tyre Changer |
1 |
/ |
97.6[2] |
/ |
5 |
4 |
Remarks:
[1] SWL values based on the
approved EIA report for New World First Bus Permanent Depot at Chai Wan
(AEIAR-029/2000),
with similar works and project nature.
[2] SWL values based on the
approved EIA report for Proposed Headquarters and Bus Maintenance Depot in Chai
Wan (AEIAR-045/2001) with similar works and project nature.
[3] 3 dB(A)
correction for impulsiveness has been taken into account in the measured SWL
(110 + 3 = 113 dB(A)).
5.4.14
Vehicles entering the workshop would require
engine warm-up during maintenance. The operational noise assessment has been
undertaken based on the daily operations of the workshop. The
estimated number and type of FEHD vehicles under repairing per day in the
proposed depot would be 9 based the following vehicles categories:-
·
Refuse Collection Vehicle: 4
·
Street Washing Vehicle / Mechanical Gully
Emptier: 3
·
Van / Light Bus / Light Truck: 2
5.4.15
As the estimated number would be only 9
vehicles per day (0700 to 1900hrs) that would require engine warm-up during
maintenance. It is anticipated that the operational noise due to the idling
vehicle engines of the maintenance vehicles would be minimal. Therefore, the
key potential noise source during maintenance would be limited to the
identified repair activities and workshop equipment.
Fixed Plant Noise
- Mechanical Ventilation and Air Conditioning System (MVAC) and other Building
Services Equipment
5.4.16
Potential sources of noise impacts are
identified as the mechanical equipment associated with the operation of the
FEHD Vehicle Depot. All mechanical equipment will be fully
enclosed within plant rooms except the fan discharge of cooling towers on the
4/F. A total of
2 cooling towers will be operated during the daytime and evening time periods
(0700 to 2300hrs); while only 1 cooling tower with low speed will be operated during
the nighttime period (2300 to
0700hrs next day).
5.4.17
The identified key
noise sources of MVAC installations are based on the preliminary design layout
plans (Appendix 5-5). The proposed
locations of plant rooms and the estimated quantity of identified noise sources
to be operated during daytime and evening time periods and nighttime
period are shown in Table 5-12.
Table 5‑12 Estimated
Quantity of Identified Fixed Plant Noise Sources
|
Location
of Plant Rooms |
Estimated Quantity of Identified Noise
Sources |
||
|
Floor |
Rooms |
Operation during Daytime and Evening Time
Period (0700hr
– 2300hr) |
Operation
during Nighttime Period (2300hr – 0700hr next day) |
|
G/F |
Transfer Tank Pump Room |
2 nos. Transferred Water Pumps 1 no. Exhaust Fan |
2 nos. Transferred Water Pumps 1 no. Exhaust Fan |
|
Chiller Pump Room |
2 nos. Water Pumps 1 no. Exhaust Fan |
1 no. Water Pump 1 no. Exhaust Fan |
|
|
Transformer Room |
2 nos. Transformers 1 no. Exhaust Fan |
2 nos. Transformers 1 no. Exhaust Fan |
|
|
UG/F |
Chiller Plant Room |
2 nos. Chillers 1 no. Exhaust Fan |
1 no. Chiller 1 no. Exhaust Fan |
|
AHU Room |
1 no. AHU |
Nil |
|
|
Water Vehicle Filing and Automatic Washing System
Water Tank and Water Pump Room |
5 nos. Water Pumps 1 no. Exhaust Fan |
5 nos. Water Pumps 1 no. Exhaust Fan |
|
|
Potable Flushing and make up water and water pump
Room |
3 nos. Water Pumps 1 no. Exhaust Fan |
3 nos. Water Pumps 1 no. Exhaust Fan |
|
|
Exhaust Fan Room |
4 nos. General Exhaust Fans 2 nos. Welding Exhaust Fans 3 nos. Vehicle Exhaust Fans |
Nil |
|
|
TBE Room |
1 no. Exhaust Fan |
1 no. Exhaust Fan |
|
|
3/F |
PAU Rooms |
5 nos. PAU |
5 nos. PAU |
|
Generator Room |
1 no. Generator (operates during power failure / maintenance) |
1 no. Generator (operates during power failure) |
|
|
4/F |
Cooling Tower Plant Room |
2 nos. Cooling Towers |
1 no. Cooling Tower |
|
PAU Room |
2 nos. PAU |
1 no. PAU |
|
|
LR/F |
Generator Room |
1 no. Generator (operates during power failure / maintenance) |
1 no. Generator (operates during power failure) |
|
Heat Pump Plant Room |
1 no. Heat Pump 1 no. Heat Water Circulation Pump 1 no. Exhaust Fan |
1 no. Heat Pump 1 no. Heat Water Circulation Pump 1 no. Exhaust Fan |
|
Off-site Traffic
Noise
5.4.18
The vehicles entering and exiting the proposed
FEHD Vehicle Depot may potentially increase the traffic noise levels at the
NSRs.
5.4.19
As per the estimated off-site traffic from
the Depot, the AM peak off-site traffic of the Depot would be 37 vehicles at
0700 to 0800hour and the PM peak off-site traffic of the Depot would be 34
vehicles at 1500 to 1600hour. It is
expected that the highest noise contribution generated by the Depot would be
during AM peak and PM peak off-site traffic of the Depot.
5.4.20
Summary of estimated off-site traffic
generation (inbound and outbound) from FEHD Depot and summary of traffic
forecast, taken into account of surrounding planned developments including the
one in Cheung Sha Wan Wholesale Food Market Phase 2
site, are shown in Appendix 5-7.
Construction
Phase
5.5.1
Methodology for assessing noise from the
construction activities associated with the proposed works is developed based
on the GW-TM and is summarized as follows:
·
location of appropriate NSRs with respect to
the work sites;
·
determination of distance attenuation and
screening effects to NSRs from notional noise source of relevant work site;
·
prediction of construction noise levels at
NSRs in the absence of any mitigation measures;
·
proposal of mitigation measures and determine
their effectiveness; and
·
determination of the residual impacts.
5.5.2
The construction noise impacts have been
assessed against the noise standards given in the EIAO-TM as follows:
·
75 dB(A) Leq,30min for
residential dwellings;
·
70 dB(A) Leq,30min for
schools; and
·
65 dB(A) Leq,30min for
schools during examination period.
Operation
Phase
Fixed Plant Noise
5.5.3
As discussed in Section 5.4 above, major operational noise source from proposed
development would be (a) workshop vehicle repair activities; and (b) MVAC and
other building services equipment.
5.5.4
The identified key
noise sources of the workshop activities and MVAC installations and other
building services equipment are based on the preliminary
design layout plans.
5.5.5
The assessment approach for the operational
noise impacts from workshop vehicle repair activities, has been conducted based
on consideration of standard acoustic principles presented in IND-TM which are
summarised as follow:
a.
Sound Power Level (SWL) associated with
operation of workshop equipment and vehicle repair activities were obtained
from the previous approved EIA Reports and via on-site noise surveys discussed in Sections 5.4.10 and
5.4.11.
b.
Sound Pressure Level (SPL) at representative
NSRs calculated based on consideration on distance attenuation, tonality
correction, impulsiveness correction, noise shielding effect, façade
correction.
5.5.6
Since the detailed design of the equipment to
be installed within the plant rooms is not available during course of study,
the maximum allowable sound power levels (SWLs) emitted from the plant rooms
would be calculated to be compliant to noise criteria set out, taking into
account also concurrent operation of noise from workshop equipment and repair
activities.
Off-site Traffic
Noise
5.5.7
The prediction of traffic noise impact is
evaluated according to the “Calculation of Road Traffic Noise” by Department of
Transport UK.
5.5.8
The off-site traffic noise impacts generated
from vehicles leaving and returning the proposed vehicle depot to the NSRs in
the vicinity is evaluated in Section 5.6.
5.6
Prediction
and Evaluation of Noise Impacts
Construction
Phase
5.6.1
Construction activities for the proposed
upgrading works in the Project include the following:
·
Site mobilisation
and hoarding;
·
Foundation; and
·
Superstructure.
·
Finishes
5.6.2
The extent of construction noise impacts
depends on the type and number of Power Mechanical Equipment (PME) to be used
in different construction activities and varies during different construction
phases. As shown in Appendix 5-4, the proposed construction programme is
expected to last for 25 months, from end 2014
to 2017. The construction activities are expected to be
conducted only during normal daytime working hours (i.e. 0700 to 1900 hours on
any day not being a Sunday or public holiday).
The corresponding predicted construction noise levels of the
construction activities listed in Section
5.4 at the
selected NSRs between Year 2014 and 2016
are shown in Table 5-10. Detailed calculations of the construction noise
impact assessment and complete PME inventory are provided in Appendix 5-8.
5.6.3
Planned NSRs have also been taken into
account in this construction noise assessment. Correspondence showing
anticipated completion dates of planned residential developments at Nam Cheong
Station are shown in Appendix 5-1. The period during
which respective planned NSRs would be exposed to the construction noise impact
from the Project are as follows:
·
Development at Nam Cheong Station from 2013
5.6.4
Express Rail Link (XRL) is being carried out
along Sham Mong Road, the nearby works area of XRL. The Highways Department has
been consulted and construction programme of the XRL project was updated.
Correspondence showing anticipated completion dates of XRL are provided in Appendix 5-9. The anticipated works
during FEHD construction are shown in Table
5-13.
Table 5‑13 Summary
of Anticipated Works of XRL
|
Works
Area |
Location |
Anticipated
Concurrent Works |
Anticipated
Construction Period |
|
Q |
Name
Cheong Station |
Reprovisioning
of bored-piles and pile caps |
Mid
2013 to End 2014 |
|
R |
Sham
Mong Road |
Nil
(Reinstatement of Sham Mong Road scheduled to be completed in early 2014) |
N/A |
|
S |
Nam
Cheong Park |
Site
office maintained |
Till
early 2015 |
|
T |
Nam
Cheong Park |
Site
office maintained |
Till
early 2016 |
5.6.5
The approved EIA report of the XRL project with
EPD Register No. AEIAR-143/2009 has been referenced. The following NSRs are in
the vicinity of both XRL and proposed FEHD project:
·
Cheong Chit House, Nam Cheong Estate
·
Cheong Yat House,
Nam Cheong Estate
·
Fu Yun House, Fu Cheong Estate
5.6.6
According to the predicted construction noise
levels in Appendix 5-8 of AERIA-143/2009, construction noise impact due to the
XRL project at the above corresponding NSRs during different works stages are
updated with XRL construction schedule provided in Table 5-13 above. Corresponding section of Appendix 5-8 of
AEIAR-143/2009, the location of noise sensitive receivers in the
AEIAR-143/2009, correspondence showing updated construction schedule of XRL
project, and the corresponding potential construction noise impact due to XRL
project to relevant NSRs considered in this assessment are provided in Appendix 5-9.
5.6.7
For the uncertainty in detailed construction
noise impact from Nam Cheong Station development, construction plant inventory
of Nam Cheong Station development was assumed, with construction schedule
assumed lasting from before 2012
towards end 2019 to represent the worst case scenario. The assumed plant
inventory is also provided in Appendix
5-8. Predicted construction noise levels of cumulative construction noise
impact from the proposed FEHD depot development together with XRL construction
and the Nam Cheong Station development, as well as construction noise impact
from the proposed FEHD development alone are provided.
5.6.8
The predicted construction noise levels shown
in Tables 5-14 and 5-15 indicate that construction activities of the
Project, if unmitigated, would result in exceedance
of the daytime construction noise criteria during normal working hours at Sir
Ellis kadoorie Secondary School (West Kowloon), Tai Kok Tsui Catholic Primary School
(Hoi Fan Road) and Fu Cheong Estate Fu Yun House (NSR N1, N2 and N7 respectively). Mitigation measures are therefore
considered to reduce the construction noise impact to acceptable levels.
Table 5‑14 Predicted
Cumulative Construction Noise Levels at Selected NSRs during Normal Daytime
Working Hours under the Unmitigated Scenario
|
NSR ID |
Descriptions |
Land Use |
ANL, dB(A) |
Predicted Construction Noise
Levels at each Assessment Year (Leq,
dB(A)) |
||
|
2014 |
2015 |
2016 |
||||
|
N1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
Education
Institute |
65
[1] |
69 |
72 |
66 |
|
N2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
Education
Institute |
65
[1] |
65 |
68 |
61 |
|
N3 |
Hampton
Place |
Residential |
75 |
61 |
64 |
58 |
|
N4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
Residential |
75 |
63 |
66 |
60 |
|
N5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
Residential |
75 |
63 |
66 |
60 |
|
N6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
Residential |
75 |
62 |
65 |
60 |
|
N7 |
Fu
Cheong Estate Fu Yun House |
Education
/ Homes for the Aged |
65
[1] |
66 |
67 |
65 |
|
N8 |
Planned
Residential Development on Nam Cheong Station |
Residential |
75 |
68 |
71 |
64 |
Notes:
1.
Construction
noise standard for schools is 70 dB(A) at normal
school days and is reduced to 65 dB(A) during examination period. The more
conservative 65 dB(A) standard is applied in this
construction noise impact assessment.
2.
Noise
levels exceeding the construction noise standards are bold.
Table 5‑15 Predicted
Construction Noise Levels at Selected NSRs during Normal Daytime Working Hours
under the Unmitigated Scenario due to the Project ONLY
|
NSR ID |
Descriptions |
Land Use |
ANL, dB(A) |
Predicted Construction
Noise Levels at each Assessment Year (Leq,
dB(A)) |
||
|
2014 |
2015 |
2016 |
||||
|
N1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
Education
Institute |
65
[1] |
69 |
72 |
65 |
|
N2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
Education
Institute |
65
[1] |
65 |
68 |
61 |
|
N3 |
Hampton
Place |
Residential |
75 |
60 |
64 |
57 |
|
N4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
Residential |
75 |
61 |
65 |
58 |
|
N5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
Residential |
75 |
62 |
65 |
58 |
|
N6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
Residential |
75 |
60 |
64 |
57 |
|
N7 |
Fu
Cheong Estate Fu Yun House |
Education
/ Homes for the Aged |
65
[1] |
61 |
64 |
57 |
|
N8 |
Planned
Residential Development on Nam Cheong Station |
Residential |
75 |
68 |
71 |
64 |
Notes:
1.
Construction
noise standard for schools is 70 dB(A) at normal
school days and is reduced to 65 dB(A) during examination period. The more
conservative 65 dB(A) standard is applied in this
construction noise impact assessment.
2.
Noise
levels exceeding the construction noise standards are bold.
Operation
Phase
Fixed Plant Noise
5.6.9
During the operational phase, noise impact
due to the identified fixed plant noise sources including (a) workshop vehicle repair
activities and (b) MVAC installation has been assessed. Based upon the
assumptions discussed in Sections 5.5.3
to 5.5.6, the predicted operational noise levels at the representative NSRs
are shown in Table 5-16. Detailed calculations
of fixed plant noise impact assessment are in Appendix 5-10.
Table 5‑16 Summary
of Predicted Operational Levels at NSRs
|
NSR ID |
Name |
Daytime & Evening Time (D) / Nighttime (N) |
Predicted Maximum Noise Level /Leq, 30mins
dB(A) |
EIAO-TM Noise Criteria / Leq,30mins /dB(A) |
|
1 |
Sir Ellis Kadoorie
Secondary School (West Kowloon) |
D |
54.4 |
65 |
|
N |
N/A |
N/A |
||
|
2 |
Tai Kok Tsui Catholic Primary School (Hoi Fan Road) |
D |
48.4 |
62 |
|
N |
N/A |
N/A |
||
|
3 |
Hampton Place |
D |
46.6 |
65 |
|
N |
43.7 |
55 |
||
|
4 |
Nam Cheong Estate Block 6 Cheong Chit House |
D |
53.7 |
65 |
|
N |
49.4 |
55 |
||
|
5 |
Nam Cheong Estate Block 5 Cheong Yat
House |
D |
53.4 |
65 |
|
N |
49.8 |
55 |
||
|
6 |
Nam Cheong Estate Block 4 Cheong Shun House |
D |
51.8 |
65 |
|
N |
47.1 |
55 |
||
|
7 |
Fu Cheong Estate Fu Yun House |
D |
52.0 |
65 |
|
N |
48.8 |
55 |
||
|
8 |
Planned Residential Development on Nam Cheong Station |
D |
58.2 |
65 |
|
N |
54.9 |
55 |
5.6.10
The maximum allowable Sound Power Level (SWL)
of each of the equipment in the plant rooms would be 90 dB(A), which should not be exceeded in order to achieve the noise
criteria.
5.6.11
Results in Table 5-16 show that the predicted maximum noise levels at the identified
NSRs due to workshop vehicle repair activities and the MVAC installations would
comply with both daytime and nighttime EIAO–TM noise
criteria.
Off-site Traffic
Noise
5.6.12
The inbound and outbound routings of the
off-site traffic of the proposed depot have been agreed with the Government in
the Traffic Impact Assessment (TIA) report (endorsed
by Transport Department). The agreed inbound and outbound vehicle routing plans
are shown in Appendix 5-7.
5.6.13
The peak flows of the off-site traffic from
the Depot would be at 0700 to 0800hour and 1500 to 1600hour during AM and PM
respectively. By comparing of the noise
levels between “with project” and “without project”
during AM and PM peaks off-site traffic of the Depot, the highest noise
contribution generated by the Depot could be assessed.
5.6.14
In order to assess the off-site traffic noise
short-term and long-term contribution generated by the Depot, the assessment
years for the off-site traffic noise are 2017 and 2032, which are the tentative
commencement of occupation year and 15 years after operation respectively.
5.6.15
The traffic forecast at AM peak (0700 – 0800)
and PM peak (1500 – 1600) for two scenarios including “with
project” and “without project” were provided by the Project Traffic Consultant
and endorsed by TD. The traffic forecasts for year 2017 and year 2032 are shown
in Table 5-17 and Table 5-18 respectively. Relevant
correspondence showing the endorsement of the traffic forecast data by the
Authority is presented in Appendix 5-7. Alignment of the road
carriageways is shown in Appendix 5-7.
Table 5‑17 Year
2017 Traffic Forecast
|
Label |
AM Peak FEHD Depot
Traffic (0700 - 0800) |
PM Peak FEHD Depot
Traffic (1500 - 1600) |
||||||
|
With Project |
Without Project |
With Project |
Without Project |
|||||
|
veh/hr |
HV % |
veh/hr |
HV % |
veh/hr |
HV % |
veh/hr |
HV % |
|
|
A1 |
95 |
94% |
58 |
90% |
134 |
92% |
118 |
91% |
|
A2 |
128 |
91% |
128 |
91% |
57 |
93% |
39 |
90% |
|
A3 |
14 |
93% |
14 |
93% |
49 |
94% |
31 |
90% |
|
A4 |
50 |
98% |
13 |
92% |
42 |
93% |
26 |
88% |
|
A5 |
105 |
90% |
105 |
90% |
32 |
91% |
32 |
91% |
|
A6 |
19 |
95% |
19 |
95% |
41 |
90% |
41 |
90% |
|
B1 |
188 |
93% |
151 |
91% |
61 |
93% |
45 |
91% |
|
B2 |
128 |
91% |
128 |
91% |
57 |
93% |
39 |
90% |
|
B3 |
188 |
98% |
188 |
98% |
66 |
98% |
66 |
98% |
|
C1 |
199 |
44% |
199 |
44% |
372 |
42% |
372 |
42% |
|
C2 |
180 |
41% |
180 |
41% |
332 |
38% |
332 |
38% |
|
C3 |
1,041 |
31% |
1,034 |
31% |
1,980 |
30% |
1,963 |
30% |
|
C4 |
1,216 |
41% |
1,216 |
41% |
2,336 |
40% |
2,318 |
40% |
|
C5 |
1,242 |
42% |
1,205 |
40% |
2,296 |
40% |
2,280 |
39% |
|
D1 |
388 |
48% |
358 |
43% |
666 |
42% |
656 |
41% |
|
D2 |
295 |
41% |
295 |
41% |
564 |
41% |
553 |
40% |
|
D3 |
227 |
48% |
223 |
47% |
408 |
44% |
406 |
44% |
|
E3 |
150 |
59% |
120 |
48% |
205 |
53% |
194 |
50% |
|
E4 |
246 |
46% |
246 |
46% |
444 |
42% |
444 |
42% |
|
F1 |
186 |
49% |
179 |
47% |
332 |
45% |
330 |
45% |
|
F2 |
216 |
50% |
216 |
50% |
396 |
48% |
393 |
47% |
|
F3 |
134 |
54% |
111 |
45% |
178 |
47% |
166 |
43% |
|
F4 |
158 |
39% |
158 |
39% |
287 |
34% |
287 |
34% |
|
H3 |
293 |
27% |
293 |
27% |
578 |
29% |
564 |
27% |
|
H4 |
389 |
34% |
389 |
34% |
755 |
35% |
755 |
35% |
|
I1 |
339 |
29% |
332 |
28% |
618 |
26% |
612 |
25% |
|
I2 |
217 |
40% |
217 |
40% |
396 |
37% |
390 |
36% |
|
I3 |
173 |
38% |
173 |
38% |
334 |
37% |
334 |
37% |
|
I4 |
343 |
29% |
343 |
29% |
676 |
30% |
662 |
29% |
|
J5 |
67 |
24% |
67 |
24% |
134 |
25% |
134 |
25% |
|
J6 |
73 |
26% |
73 |
26% |
138 |
24% |
138 |
24% |
|
K1 |
195 |
47% |
188 |
45% |
371 |
46% |
369 |
45% |
|
K2 |
219 |
49% |
219 |
49% |
424 |
49% |
421 |
49% |
|
L1 |
206 |
49% |
199 |
47% |
384 |
46% |
382 |
46% |
|
L2 |
216 |
48% |
216 |
48% |
432 |
49% |
429 |
49% |
|
M3 |
1,188 |
36% |
1,188 |
36% |
2,785 |
33% |
2,785 |
33% |
|
M4 |
668 |
36% |
668 |
36% |
1,569 |
33% |
1,569 |
33% |
Table 5‑18 Year
2032 Traffic Forecast
|
Label |
AM Peak FEHD Depot
Traffic (0700 - 0800) |
PM Peak FEHD Depot
Traffic (1500 - 1600) |
||||||
|
With Project |
Without Project |
With Project |
Without Project |
|||||
|
veh/hr |
HV % |
veh/hr |
HV % |
veh/hr |
HV % |
veh/hr |
HV % |
|
|
A1 |
106 |
93% |
69 |
90% |
153 |
92% |
137 |
91% |
|
A2 |
148 |
91% |
148 |
91% |
63 |
92% |
45 |
89% |
|
A3 |
17 |
94% |
17 |
94% |
53 |
94% |
35 |
91% |
|
A4 |
52 |
98% |
15 |
93% |
45 |
93% |
29 |
90% |
|
A5 |
122 |
91% |
122 |
91% |
37 |
92% |
37 |
92% |
|
A6 |
22 |
95% |
22 |
95% |
49 |
90% |
49 |
90% |
|
B1 |
214 |
92% |
177 |
90% |
69 |
93% |
53 |
91% |
|
B2 |
148 |
91% |
148 |
91% |
63 |
92% |
45 |
89% |
|
B3 |
219 |
98% |
219 |
98% |
77 |
99% |
77 |
99% |
|
C1 |
230 |
43% |
230 |
43% |
432 |
42% |
432 |
42% |
|
C2 |
207 |
40% |
207 |
40% |
385 |
37% |
385 |
37% |
|
C3 |
1,207 |
31% |
1,200 |
31% |
2,296 |
30% |
2,279 |
30% |
|
C4 |
1,410 |
41% |
1,410 |
41% |
2,710 |
40% |
2,692 |
40% |
|
C5 |
1,434 |
42% |
1,397 |
40% |
2,665 |
40% |
2,649 |
39% |
|
D1 |
444 |
47% |
414 |
43% |
772 |
42% |
762 |
41% |
|
D2 |
341 |
41% |
341 |
41% |
654 |
41% |
643 |
40% |
|
D3 |
261 |
47% |
257 |
46% |
475 |
44% |
473 |
44% |
|
E3 |
166 |
58% |
136 |
49% |
237 |
53% |
226 |
50% |
|
E4 |
283 |
46% |
283 |
46% |
511 |
42% |
511 |
42% |
|
F1 |
213 |
48% |
206 |
47% |
383 |
45% |
381 |
44% |
|
F2 |
248 |
50% |
248 |
50% |
459 |
48% |
456 |
48% |
|
F3 |
148 |
54% |
125 |
46% |
204 |
47% |
192 |
44% |
|
F4 |
184 |
39% |
184 |
39% |
333 |
34% |
333 |
34% |
|
H3 |
342 |
28% |
342 |
28% |
671 |
29% |
657 |
27% |
|
H4 |
450 |
34% |
450 |
34% |
877 |
35% |
877 |
35% |
|
I1 |
394 |
30% |
387 |
28% |
718 |
26% |
712 |
25% |
|
I2 |
253 |
40% |
253 |
40% |
459 |
37% |
453 |
36% |
|
I3 |
204 |
39% |
204 |
39% |
386 |
37% |
386 |
37% |
|
I4 |
397 |
29% |
397 |
29% |
784 |
30% |
770 |
29% |
|
J5 |
76 |
22% |
76 |
22% |
157 |
25% |
157 |
25% |
|
J6 |
83 |
25% |
83 |
25% |
162 |
25% |
162 |
25% |
|
K1 |
225 |
46% |
218 |
44% |
430 |
46% |
428 |
45% |
|
K2 |
253 |
49% |
253 |
49% |
491 |
49% |
488 |
49% |
|
L1 |
238 |
48% |
231 |
47% |
448 |
46% |
446 |
46% |
|
L2 |
249 |
48% |
249 |
48% |
498 |
50% |
495 |
49% |
|
M3 |
1,378 |
36% |
1,378 |
36% |
3,232 |
33% |
3,232 |
33% |
|
M4 |
774 |
36% |
774 |
36% |
1,824 |
33% |
1,824 |
33% |
5.6.16
Noise
models for the off-site traffic noise impact assessment have been established
using computer simulation software RoadNoise 2000.
5.6.17
Table 5-19 and Table 5-20 summarise the predicted
traffic noise levels at NSRs for the “with project”
and “without project” scenarios during both AM peak and PM peak off-site
traffic of the Depot in year 2017. As advised by MTRC, the anticipated completion
of the whole development on Nam Cheong Station (NSR 8) would be no later than
year of 2019. Therefore,
the planned residential development on Nam Cheong station shall not be taken
into account for the off-site traffic noise prediction in year 2017.
Table 5‑19 Predicted
Noise Levels for “with project” and “without project”
Scenarios during AM Peak Off-site Traffic of FEHD Depot (0700 – 0800) in Year
2017, L10,(1-hr)
|
NSR ID and Name |
Noise Assessment Points |
Floors |
AM
Peak Off-site Traffic of FEHD
Depot Year
2017 |
Traffic Noise Contribution by FEHD
Depot / dB(A)[1] |
|
|
With
Project |
Without
Project |
||||
|
NSR 1 Sir Ellis Kadoorie Secondary School (West Kowloon) |
N101 |
1/F
– 8/F |
64.4 - 68.6 |
65.5 - 70.2 |
-1.6 ~ -0.8 |
|
N102 |
1/F
– 8/F |
60.4 - 64.7 |
60.7 - 64.9 |
-0.3 ~ -0.1 |
|
|
N103 |
1/F
– 8/F |
68.9 - 71.8 |
69.0 - 72.0 |
-0.2 ~ -0.1 |
|
|
NSR 2 Tai Kok Tsui Catholic Primary
School (Hoi Fan Road) |
N201 |
1/F
– 8/F |
62.4 - 67.3 |
62.4 - 68.0 |
-0.7 ~ 0.0 |
|
N202 |
1/F
– 8/F |
54.4 - 58.5 |
54.4 - 58.5 |
0.0 ~ 0.0 |
|
|
N203 |
1/F
– 8/F |
69.9 - 72.1 |
70.0 - 72.2 |
-0.1 ~ 0.0 |
|
|
NSR 3 Hampton Place |
N301 |
1/F
– 48/F |
64.0 - 71.1 |
64.6 - 71.2 |
-0.7 ~ -0.1 |
|
NSR 4 Nam Cheong Estate Block 6 Cheong Chit House |
N401 |
1/F
– 15/F |
61.7 - 69.6 |
61.5 - 69.5 |
0.0 ~ 0.2 |
|
NSR 5 Nam Cheong Estate Block 5 Cheong Yat House |
N501 |
1/F
– 15/F |
61.8 - 69.8 |
61.6 - 69.7 |
0.1 ~ 0.2 |
|
NSR 6 Nam Cheong Estate Block 4 Cheong Shun House |
N601 |
1/F
– 15/F |
58.0 - 66.6 |
57.8 - 66.4 |
0.2 ~ 0.3 |
|
NSR 7 Fu Cheong Estate Fu Yun House |
N701 |
1/F
– 5/F |
62.9 - 69.4 |
62.7 - 69.1 |
0.2 ~ 0.3 |
|
Note: [1] This is the difference between the predicted traffic
noise levels “with” and “without” the FEHD Depot project |
|||||
Table 5‑20 Predicted
Noise Levels for “with project” and “without project”
Scenarios during PM Peak Off-site Traffic of FEHD Depot (1500 – 1600) in Year
2017, L10,(1-hr)
|
NSR ID and Name |
Noise
Assessment Points |
Floors |
PM Peak Off-site Traffic of FEHD Depot Year 2017 |
Traffic
Noise Contribution by FEHD Depot / dB(A)[1] |
|
|
With Project |
Without Project |
||||
|
NSR 1 Sir Ellis Kadoorie Secondary School (West
Kowloon) |
N101 |
1/F – 8/F |
67.3 -
71.5 |
68.3 -
73.0 |
-1.5 ~
-0.7 |
|
N102 |
1/F – 8/F |
62.9 -
67.3 |
63.2 -
67.4 |
-0.3 ~
-0.1 |
|
|
N103 |
1/F – 8/F |
71.9 -
74.8 |
71.9 -
75.0 |
-0.2 ~ 0.0 |
|
|
NSR 2 Tai Kok Tsui Catholic
Primary School (Hoi Fan Road) |
N201 |
1/F – 8/F |
65.4 -
70.2 |
65.4 -
71.0 |
-0.8 ~ 0.0 |
|
N202 |
1/F – 8/F |
57.3 -
61.3 |
57.2 -
61.3 |
0.0 ~ 0.1 |
|
|
N203 |
1/F – 8/F |
72.9 -
75.1 |
72.9 -
75.2 |
-0.1 ~ 0.0 |
|
|
NSR 3 Hampton
Place |
N301 |
1/F – 48/F |
66.9 -
74.3 |
67.4 -
74.4 |
-0.6 ~
-0.1 |
|
NSR 4 Nam Cheong
Estate Block 6 Cheong Chit House |
N401 |
1/F – 15/F |
64.4 -
72.2 |
64.3 -
72.1 |
0.0 ~ 0.1 |
|
NSR 5 Nam Cheong
Estate Block 5 Cheong Yat House |
N501 |
1/F – 15/F |
64.5 -
72.4 |
64.4 -
72.3 |
0.0 ~ 0.1 |
|
NSR 6 Nam Cheong
Estate Block 4 Cheong Shun House |
N601 |
1/F – 15/F |
60.6 -
69.1 |
60.5 -
69.0 |
0.0 ~ 0.1 |
|
NSR 7 Fu Cheong
Estate Fu Yun House |
N701 |
1/F – 5/F |
65.6 -
71.7 |
65.5 -
71.6 |
0.1 ~ 0.1 |
|
Note: [1] This is the difference between the predicted
traffic noise levels “with” and “without” the FEHD Depot project |
|||||
5.6.18
Table 5-21 and Table 5-22 summarise the predicted
traffic noise levels at NSRs for the “with project” and
“without project” scenarios during AM peak and PM off-site traffic of the Depot
in year 2032. Noted that the planned NSR8 (Nam Cheong Station) has been
included.
Table 5‑21 Predicted
Noise Levels for “with project” and “without project”
Scenarios during AM Peak Off-site Traffic of FEHD Depot (0700 – 0800) in Year
2032, L10,(1-hr)
|
NSR ID and
Name |
Noise
Assessment Points |
Floors |
AM Peak Off-site Traffic
of FEHD Depot Year 2032 |
Traffic Noise
Contribution by FEHD Depot / dB(A)[1] |
|
|
With Project |
Without Project |
||||
|
NSR 1 Sir Ellis Kadoorie
Secondary School (West Kowloon) |
N101 |
1/F – 8/F |
65.0
- 69.2 |
66.1
- 70.9 |
-1.7
~ -0.9 |
|
N102 |
1/F – 8/F |
60.8
- 65.1 |
61.1
- 65.3 |
-0.3
~ -0.2 |
|
|
N103 |
1/F – 8/F |
69.6
- 72.4 |
69.7
- 72.7 |
-0.3
~ -0.1 |
|
|
NSR 2 Tai Kok Tsui Catholic Primary School (Hoi Fan Road) |
N201 |
1/F – 8/F |
63.1
- 67.9 |
63.1
- 68.7 |
-0.8
~ 0.0 |
|
N202 |
1/F – 8/F |
54.8
- 58.9 |
54.8
- 58.9 |
0.0
~ 0.0 |
|
|
N203 |
1/F – 8/F |
70.6
- 72.8 |
70.7
- 72.9 |
-0.1
~ 0.0 |
|
|
NSR 3 Hampton Place |
N301 |
1/F – 48/F |
64.6
- 71.7 |
65.2
- 71.9 |
-0.7
~ -0.1 |
|
NSR 4 Nam Cheong Estate Block 6 Cheong Chit House |
N401 |
1/F – 15/F |
62.3
- 70.0 |
62.1
- 69.9 |
0.0
~ 0.2 |
|
NSR 5 Nam Cheong Estate Block 5 Cheong Yat
House |
N501 |
1/F – 15/F |
62.2
- 70.2 |
62.0
- 70.1 |
0.1
~ 0.2 |
|
NSR 6 Nam Cheong Estate Block 4 Cheong Shun House |
N601 |
1/F – 15/F |
60.5
- 67.2 |
60.4
- 67.1 |
0.1
~ 0.3 |
|
NSR 7 Fu Cheong Estate Fu Yun House |
N701 |
1/F – 5/F |
62.3
- 69.9 |
62.2
- 69.6 |
0.1
~ 0.3 |
|
NSR 8 Planned Residential Development on Nam Cheong
Station |
N801 |
1/F – 9/F |
77.3
- 81.9 |
77.2
- 81.9 |
0.0
~ 0.1 |
|
N802 |
1/F – 9/F |
69.6
- 78.3 |
69.5
- 78.2 |
0.0
~ 0.1 |
|
|
N803 |
1/F – 40/F |
67.3
- 72.6 |
67.3
- 72.6 |
0.0
~ 0.1 |
|
|
N804 |
1/F – 40/F |
68.2
- 71.9 |
68
- 71.7 |
0.1
~ 0.3 |
|
|
N805 |
1/F – 40/F |
65.4
- 69.9 |
64.9
- 69.4 |
0.4
~ 0.7 |
|
|
Note: [1] This is the difference between the predicted
traffic noise levels “with” and “without” the FEHD Depot project |
|||||
Table 5‑22 Predicted
Noise Levels for “with project” and “without project”
Scenarios during PM Peak Off-site Traffic of FEHD Depot (1500 – 1600) in Year
2032, L10,(1-hr)
|
NSR ID and Name |
Noise Assessment Points |
Floors |
PM Peak Off-site Traffic
of FEHD Depot
Year 2032 |
Traffic Noise
Contribution by FEHD Depot / dB(A)[1] |
|
|
With Project |
Without Project |
||||
|
NSR 1 Sir Ellis Kadoorie
Secondary School (West Kowloon) |
N101 |
1/F – 8/F |
68.0
- 72.1 |
68.9
- 73.6 |
-1.5
~ -0.7 |
|
N102 |
1/F – 8/F |
63.6
- 68.0 |
63.9
- 68.2 |
-0.3
~ -0.1 |
|
|
N103 |
1/F – 8/F |
72.5
- 75.4 |
72.5
- 75.6 |
-0.2
~ 0.0 |
|
|
NSR 2 Tai Kok Tsui Catholic Primary School (Hoi Fan Road) |
N201 |
1/F – 8/F |
66.0
- 70.9 |
66.0
- 71.6 |
-0.7
~ 0.0 |
|
N202 |
1/F – 8/F |
58.0
- 62.1 |
58.0
- 62.1 |
0.0
~ 0.1 |
|
|
N203 |
1/F – 8/F |
73.5
- 75.7 |
73.5
- 75.8 |
-0.1
~ 0.0 |
|
|
NSR 3 Hampton Place |
N301 |
1/F – 48/F |
67.6
- 74.9 |
68.1
- 75.0 |
-0.6
~ -0.1 |
|
NSR 4 Nam Cheong Estate Block 6 Cheong Chit House |
N401 |
1/F – 15/F |
64.9
- 72.5 |
64.8
- 72.5 |
0.0
~ 0.1 |
|
NSR 5 Nam Cheong Estate Block 5 Cheong Yat
House |
N501 |
1/F – 15/F |
64.8
- 72.7 |
64.8
- 72.7 |
0.0
~ 0.1 |
|
NSR 6 Nam Cheong Estate Block 4 Cheong Shun House |
N601 |
1/F – 15/F |
63.3
- 69.7 |
63.3
- 69.7 |
0.0
~ 0.1 |
|
NSR 7 Fu Cheong Estate Fu Yun House |
N701 |
1/F – 5/F |
64.9
- 72.2 |
64.9
- 72.1 |
0.0
~ 0.1 |
|
NSR 8 Planned Residential Development on Nam Cheong
Station |
N801 |
1/F – 9/F |
80.5
- 85.3 |
80.5
- 85.3 |
0.0
~ 0.1 |
|
N802 |
1/F – 9/F |
72.7
- 81.5 |
72.6
- 81.5 |
0.0
~ 0.1 |
|
|
N803 |
1/F – 40/F |
70.2
- 75.6 |
70.2
- 75.6 |
0.0
~ 0.1 |
|
|
N804 |
1/F – 40/F |
70.8
- 74.5 |
70.7
- 74.5 |
0.0
~ 0.1 |
|
|
N805 |
1/F – 40/F |
67.4
- 71.9 |
67.3
- 71.8 |
0.1
~ 0.2 |
|
|
Note: [1] This is the difference between the predicted traffic
noise levels “with” and “without” the FEHD Depot project |
|||||
5.6.19
As read from the predicted results in
the year of 2017 as shown in Table 5-19
and Table 5-20, there is
insignificant increase in noise contribution caused by the off-site traffic of
FEHD Depot in the range of 0 – 0.3 dB(A) and 0 – 0.1
dB(A) during AM peak and PM peak respectively at Cheong Chit House (NSR 4),
Cheong Yat House (NSR5), Cheong Shun House (NSR 6)
and Fu Yun House (NSR 7). On the other hand, it is suggested that the
Depot could act as a substantial barrier benefits to noise reductions for the
traffic noise in the range of -0.1 to -1.6 dB(A) and -0.1 to -1.5
dB(A) during AM peak and PM peak
respectively for Sir Ellis Kadoorie Secondary School
(West Kowloon) (NSR1), Tai Kok Tsui
Catholic Primary School (Hoi Fan Road) (NSR2) and Hampton Place (NSR3).
5.6.20
For the predicted results in the year of 2032
as shown in Table 5-21 and Table 5-22, insignificant increase in
noise contribution could be concluded also caused by the off-site traffic of
FEHD in the range of 0 – 0.7 dB(A) and 0 – 0.2 dB(A) during AM peak and PM peak
respectively at Cheong Chit House (NSR 4), Cheong Yat
House (NSR5), Cheong Shun House (NSR 6), Fu Yun House (NSR 7) and planned
residential development on Nam Cheong station (NSR 8). Similar to the case
in year 2017, the Depot has brought environmental benefits in terms of useful
noise reductions for the traffic noise in the range of -0.1 to
-1.7 dB(A) and -0.1 to
-1.5 dB(A) during AM peak and PM peak
for Sir Ellis Kadoorie Secondary School (West
Kowloon) (NSR1), Tai Kok Tsui
Catholic Primary School (Hoi Fan Road) (NSR2) and Hampton Place (NSR3).
5.6.21
The assessment results demonstrate that only
insignificant off-site traffic noise level would be generated from the Depot,
which are less than 1.0 dB(A) at all representative NSRs in both short-term
period and in the long run. Moreover,
environmental benefits by the development of the Depot as a noise tolerate
building fronting some of the NSRs could also contribute traffic noise reduction
by up to 1.7dB(A).
5.7
Proposed
Noise
Mitigation
Measures
Construction Phase
5.7.1
Mitigation measures are required for the NSRs
at which unmitigated construction noise levels are predicted to exceed the
corresponding construction noise criteria as shown in Section 5.2.5.
Available
Construction Noise Mitigation Measures
5.7.2
A number of available construction noise
mitigation measures have been considered in this assessment, including:
·
selection and optimization of construction programmes,
avoidance of parallel operation of noisy PME, and/or reduction in the
proportion of usage of PME during noise sensitive periods such as school
examination period;
·
use of “quiet” PME and working methods;
·
use of temporary at-source noise mitigation
measures such as noise barriers, noise enclosures, noise jacket and mufflers;
and
·
use of good site practice to limit noise
emission from construction site.
Selection and
Programming of Construction Processes
5.7.3
The timing and sequencing of the various construction
activities shall be carefully arranged according to the actual site work
situation, in order to limit the amount of concurrent activities and where
applicable, to avoid parallel operation of noisy PME in order to minimise
the total noise generated during construction periods. Limiting the quantity of PME to be operated
concurrently and also their proportion of usage were recommended in the Project
and incorporated in this assessment. The proposed quantity of PMEs and their
proportion of usage have been confirmed feasible by the Project Engineer. In
the case during school examination while more stringent construction noise
criteria should be imposed, the potentially most disruptive construction
activities should be avoided, and arranged to be conducted during school
holidays as far as practicable.
Use of “Quiet”
Alternative Plant and Working Methods
5.7.4
The use of particular plant with equipment
noise levels quieter than those specified in the GW-TM can result in reduction
of noise levels generated by the plant.
The level of noise reduction achieved is dependent on the contractor’s
chosen methods of working. It is
possible for the contractor to achieve noise reductions from the adopted
working methodologies by specifying maximum limits of sound power level for
specific plant equipment.
5.7.5
“Quiet” plant is defined as a PME having
actual Sound Power Levels (SWLs) lower than the values specified for PME in the
GW-TM. SWLs for typical PME provided in
the GW-TM and that for equivalent “quiet” plants are presented in Table 5-23.
5.7.6
The type of quiet PME adopted in this
assessment is for reference only and to be confirmed by the contractors, in
view of the actually construction conditions and programmes. The contractors
are allowed to use other type of quiet PME, which have the equivalent total
SWLs, to meet their needs.
Table 5‑23 Maximum
SWLs for Selected “Quiet” and Alternative Plants
|
Identification Code in
GW-TM |
Descriptions of PME |
SWL in GW-TM, dB(A) |
“quiet” PME example in
QPME list [1] |
SWL of “quiet” PME,
dB(A) |
|
CNP 081 |
Loader, wheeled (Back-hoe) |
112 |
EPD-00946
|
104 |
|
CNP 081 |
Excavator, Tracked |
112 |
EPD-01652
|
99 |
|
CNP 103 |
Generator |
95 |
EPD-01593 |
89 |
|
CNP 048 |
Mobile Crane |
112 |
EPD-01516 |
101 |
Note:
1. QPME
list available on the EPD website
Temporary Noise
Barriers
5.7.7
Temporary noise barriers provide noise
attenuation by screening NSRs from stationary and mobile plants from direct
line-of-sight in shadow zone. The use of 3m high moveable barriers with skid
footing and a small cantilevered upper portion can be located within 6m from
stationary plants and about 5m from mobile plants such as back-hoe loader,
tracked excavator. Whilst
screening effects can be achieved at upper floors of NSRs, greater benefits
result at lower floors where screening is the most effective. These temporary
noise barriers will become more effective when located immediately adjacent to
working area, and can reduce the noise level by up to 5 dB(A) and 10 dB(A) for
mobile and stationary plants, respectively.
The temporary noise barriers could also be located along the working
area in order to make sure that all construction plants could be screened
during all kinds of construction activities.
Besides, there would be use of hand-held drill,
jig saw, wire saws for finishes construction. Since the works would be within
internal of concrete building envelope, noise reduction of 5 dB(A)
is also considered to reflect the reality.
5.7.8 Depending
on site situation, when temporary noise barriers are not practicable or noise
reduction achieved is insufficient, noise jacket/muffler can be applied to
cover the noisy part of the engine or at the engine exhaust of particular
mobile plants respectively. Applicable PME
with temporary noise barrier include excavator, wheeled loader, mini-robot
mounted breaker, concrete lorry mixer and concrete pump. It is assumed that
temporary noise barriers of this type can provide partial screening effect of 5
dB(A) in the assessment.
5.7.9
The noise attenuation of 5dB(A)
are considered achievable by careful selection of insulation material for
temporary noise barrier, and, if necessary, acoustic mats at noisy mechanical
parts of the equipment. Barrier
material of surface density of at least 10 kg/m2 is recommended in
order to achieve the necessary screening effect.
Good Site
Practice
5.7.10
The use of good site practice/techniques can
provide considerable reductions in noise emissions. Examples of these site practice include:
·
use of well-maintained and regularly-serviced
plant during the works;
·
plant operating on intermittent basis should
be turned off or throttled down when not in active use;
·
plant that is known to emit noise strongly in
one direction should be orientated to face away from the NSRs;
·
silencers, mufflers and enclosures for plant
should be used where possible and maintained adequately throughout the works;
·
where possible fixed plants should be sited
away from NSRs; and
·
stockpiles of excavated materials and other
structures such as site buildings should be used effectively to screen noise
from the works.
Operation
Phase
Fixed Plant Noise
- Workshop Vehicle Repair Activities
5.7.11
The future operator should ensure that the
workshop vehicle repair activities should be carried out under the covered area
of the Transport Workshop Section on the G/F (Appendix 5-5) as the building of FEHD Depot itself provide
screening effect to the NSRs.
5.7.12
As the noise limit during nighttime
period (2300 – 0700hrs next day) is more stringent than the daytime and evening
time periods (0700 – 2300), the future operator should ensure that the workshop
vehicle repair activities should not be carried out during nighttime
period.
Fixed Plant Noise
- MVAC and other Building Services Equipment
5.7.13
With reference to “Good practices on
Ventilation System Noise Control (GP-VS)”, acoustic treatments, such as
acoustic louvres, silencers, enclosures could be
applied to achieve noise attenuation so that the SWL of the equipment shall not
exceed the specified “maximum allowable SWL” in various plant rooms of the
latest layout plan in Appendix 5-5.
Off-site Traffic
Noise
5.7.14
In view of the results of noise predictions
mentioned in Sections 5.6.19 to 5.6.21,
the potential off-site noise impact due to on-site vehicular traffic and
vehicular traffic would be insignificant. No mitigation measure is recommended
for the off-site traffic noise.
5.8
Assessment of Noise Impacts with the Application of Mitigation Measures
Construction Phase
5.8.1
Construction noise calculations have been
carried out with the incorporation of different noise mitigation measures as
discussed in Section 5.7, as far as
practicable according to the actual construction condition and limitation. Mitigation measures adopted in this
assessment include:
·
the use of quiet plants for PME (QPME);
·
temporary noise barriers for PME, as well as
noise jacket and mufflers to cover the noisy part of PME and at the engine
exhaust of mobile plants respectively;
·
limiting of number of plants operated
concurrently.
5.8.2
Construction noise levels at the selected
NSRs (which are predicted to be the worst affected by the associated
construction works) under the mitigated scenario are summarized in Tables
5-24 and 5-25. Detailed calculations
of the construction noise impact assessment and complete PME inventory are
provided in Appendix 5-11.
Table 5‑24 Predicted
Cumulative Construction Noise Levels at Selected NSRs during Normal Daytime
Working Hours under the Mitigated Scenario
|
NSR ID |
Descriptions |
Land Use |
Limit |
Predicted Construction Noise Levels at
each Assessment Year (Leq, dB(A)) |
||
|
2014 |
2015 |
2016 |
||||
|
N1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
Education
Institute |
65 [1] |
63 |
64 |
64 |
|
N2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
Education
Institute |
65 [1] |
59 |
60 |
60 |
|
N3 |
Hampton
Place |
Residential |
75 |
55 |
56 |
56 |
|
N4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
Residential |
75 |
60 |
60 |
59 |
|
N5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
Residential |
75 |
59 |
59 |
59 |
|
N6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
Residential |
75 |
58 |
59 |
59 |
|
N7 |
Fu Cheong Estate Fu
Yun House |
Education / Homes
for the Aged |
65
[1] |
65 |
64 |
64 |
|
N8 |
Planned
Residential Development on Nam Cheong Station |
Residential |
75 |
61 |
62 |
62 |
Note:
1.
Construction
noise standard for schools is70 dB(A) at normal school
days and is reduced to 65 dB(A) during examination period. The more
conservative 65dB(A) standard is applied in this
construction noise impact assessment.
Table 5‑25 Predicted
Construction Noise Levels at Selected NSRs during Normal Daytime Working Hours
under the Mitigated Scenario due to the Project ONLY
|
NSR ID |
Descriptions |
Land Use |
Limit |
Predicted
Construction Noise Levels at each Assessment Year (Leq, dB(A)) |
||
|
2014 |
2015 |
2016 |
||||
|
N1 |
Sir
Ellis Kadoorie Secondary School (West Kowloon) |
Education
Institute |
65 [1] |
63 |
63 |
63 |
|
N2 |
Tai
Kok Tsui Catholic Primary
School (Hoi Fan Road) |
Education
Institute |
65 [1] |
58 |
59 |
59 |
|
N3 |
Hampton
Place |
Residential |
75 |
54 |
55 |
55 |
|
N4 |
Nam
Cheong Estate Block 6 Cheong Chit House |
Residential |
75 |
55 |
56 |
56 |
|
N5 |
Nam
Cheong Estate Block 5 Cheong Yat House |
Residential |
75 |
55 |
56 |
56 |
|
N6 |
Nam
Cheong Estate Block 4 Cheong Shun House |
Residential |
75 |
54 |
55 |
55 |
|
N7 |
Fu
Cheong Estate Fu Yun House |
Education
/ Homes for the Aged |
65 [1] |
54 |
55 |
55 |
|
N8 |
Planned Residential
Development on Nam Cheong Station |
Residential |
75 |
61 |
62 |
62 |
Note:
1.
Construction
noise standard for schools is 70dB(A) at normal school
days and is reduced to 65 dB(A) during examination period. The more
conservative 65dB(A) standard is applied in this
construction noise impact assessment.
5.8.3
In view of the results listed on Tables
5-24 and 5-25, it can be noted
that the predicted construction noise levels with noise mitigation measures at
the NSRs shall comply with the corresponding construction noise limits.
5.8.4
It is noted that predicted construction noise
levels at nearby educational institutions, such as Fu Cheong Estate Fu Yun
House and Sir Ellis Kadoorie Secondary School
complies with corresponding assessment criteria during normal school days, i.e.
70dB(A), but only marginally comply with the assessment criteria of examination
period, i.e. 65dB(A). Although this predicted overall construction noise level
has taken into account concurrent construction works in the vicinity and the
contribution due to the Project itself is minimal with the implementation of
mitigation measures, it is recommended that more detailed construction work
programme should be considered before actual construction work is undertaken by
the contractor, and applicable noise mitigation measures should be implemented
according to the actual site condition and constraints, in order to minimise
the potential cumulative construction noise impact with concurrent projects. In
particular, the Contractor shall keep close liaison with the nearby educational
institutions, and special arrangement on PME operations should be determined
during school examination periods.
Operation
Phase
Fixed Plant Noise
5.8.5
With the implementation of the mitigation
measures for both workshop vehicle repair activities and MVAC installation
discussed in Sections 5.7.11 to 5.7.13.
The predicted maximum noise levels at the
identified NSRs due to workshop vehicle repair activities and the MVAC
installations are shown in Table 5-16
which would comply with both daytime and nighttime
EIAO–TM noise criteria.
Off-site Traffic
Noise
5.8.6
As noise
mitigation measure is not necessary for the off-site traffic noise, there is no
off-site traffic noise assessment result under mitigation measures.
Construction Phase
5.9.1
With the implementation of the mitigation
measures in form of utilising
quieter plant and temporary noise barrier, predicted construction noise level
at majority of the selected NSRs shall comply with the corresponding
construction noise limits. Thus, there would be no adverse residual impact
anticipated at nearby NSRs.
Operation
Phase
5.9.2
With the implementation of the mitigation
measures for both workshop vehicle repair activities and MVAC installation
discussed in Sections 5.7.11 to 5.7.13.
The predicted maximum noise levels at the identified NSRs due to workshop vehicle
repair activities and the MVAC installations would comply with both daytime and
nighttime EIAO–TM noise criteria. Therefore, there would be no
residual impact at the NSRs due to the fixed plant noise sources.
5.9.3
As discussed in Sections 5.6.19 to 5.6.21,
potential traffic noise impact generated by the future operation of the Depot is predicted to be insignificant. There would be no adverse residual impact
anticipated at nearby NSRs due to the off-site traffic noise.
5.10 Environmental Monitoring and Audit
Construction Phase
5.10.1
The assessment has concluded that, with the
implementation of mitigation measures in form of utilising quieter plant,
limiting the number of construction plants operating concurrently, temporary
noise barrier, noise jackets and mufflers, no adverse residual construction
impact would be anticipated.
5.10.2
Environmental monitoring and audit measures
are recommended during the construction phase of the Project to ensure adverse
impacts do not occur. An appropriate path for noise complaints handling
procedures is a key element of the EM&A programme. Detailed implementation schedules of all
mitigation measures are also provided in the EM&A Manual.
Operation Phase
5.10.3
Noise monitoring during the operation phase
of this is considered not necessary as the proposed Depot would not be expected
to impose significant noise impact to adjacent identified NSRs with the
implementation of the recommended mitigation measures.
Construction Phase
5.11.1
With the implementation of the recommended
mitigation measures such as the use of QPME employed in the works, temporary
noise barriers, noise jackets, mufflers, and limiting the number of plants
operated concurrently, adverse construction noise impact is not anticipated. It
is recommended that more detailed construction work programme should be
considered before actual construction work is undertaken by the contractor, and
applicable noise mitigation measures should be implemented according to the
actual site condition and constraints, in order to minimise the potential
cumulative construction noise impact with concurrent projects. In particular,
the Contractor shall keep close liaison with the nearby educational
institutions, and special arrangement on PME operations should be determined
during school examination periods.
5.11.2
Environmental monitoring and auditing
procedures are also recommended in EM&A manual to ensure the implementation
of construction noise mitigation measures as well as to establish an
appropriate path for noise complaints handling. Regardless of the results of
construction noise impact assessment for restricted hours, the Noise Control
Authority will process Construction Noise Permit (CNP) application, if necessary,
based on the NCO, the relevant technical memoranda issued under NCO, and the
contemporary conditions/situations.
Operation Phase
Fixed Plant Noise
5.11.3 With the
implementation of the mitigation measures for both workshop vehicle repair
activities and MVAC installation such as workshop vehicle repair activities to
be carried out under the covered area to be operated during daytime and evening
periods only and acoustic treatments, such as acoustic silencers, acoustic louvres to be applied to the MVAC installations in order to
achieve the specified maximum allowable SWL. Adverse impact to the NSRs due to
the fixed plant noise would not be anticipated during operation phase.
Off-site Traffic
Noise
5.11.4
Based on the insignificant off-site traffic
generation and routings for the Project development, the assessment results
demonstrate that the operation of the FEHD Depot would introduce insignificant
traffic noise impact less than 1.0 dB(A) to all representative NSRs for
short-term period and in the long run.
5.11.5
Moreover, environmental benefits by the
development of Depot as a noise tolerate building fronting some of the NSRs
could also contribute traffic noise reduction by up to 1.7 dB(A).