4.0....... NOISE IMPACT
ASSESSMENT
4.1 Introduction
. 4-1
4.2 Environmental Legislation,
Standards and Guidelines
4.3 Description of the Environment
4.4 Assessment Area and NSRs
4.5 Construction Noise Impact
Assessment
. 4-14
4.6 Operation Noise Impact
Assessment
4.7 Environmental Monitoring and
Audit
4.8 Conclusion
FIGURES
Figure 4.1 New
Scheme with 300m Assessment Area
Figure 4.2 Locations
of Representative Noise Sensitive Receivers
Figure 4.3 Distance
between Notional Sources and the Representative Noise Sensitive Receivers
Figure 4.4 Road
Sections within Assessment Area
Figure
4.5 Location
of Proposed Low-noise Road Surfacing and Noise Barriers
APPENDICES
Appendix 4.1 Letters of Confirmation from the
Pat Heung Division Police Station and Pat Heung Fire Station
Appendix
4.2 Photos of Existing
Representative Noise Sensitive Receivers
Appendix 4.3 Construction Plant Inventory
Appendix 4.4 Tentative Construction Works
Programme
Appendix 4.5 Operation Duration of PME for the
Construction of Road Works
Appendix 4.6 Calculations of Construction Noise
Levels (Unmitigated Scenario)
Appendix 4.7 Calculations of Construction Noise
Levels (Mitigated Scenario)
Appendix 4.8 Key Map of Traffic Flow and Traffic
Data
Appendix 4.9 Transport Department’s Endorsement
on Traffic Forecast
Appendix 4.10 (Not
used)
Appendix
4.11 Calculations of Operation Noise
Levels (Unmitigated Scenario)
Appendix
4.12 Constraints of Proposed
Mitigation Measures
Appendix
4.13 Calculations of Operation Noise
Levels (Mitigated Scenario)
Appendix
4.14 Eligibility Test for Indirect
Noise Mitigation Measures
Appendix 4.15 Calculations of Operation Noise Levels (without
Project Scenario)
This section presents the noise
impact assessment for the construction and operational phases of the Project.
In accordance with Annex 13 of the EIAO-TM, the existing, committed and planned
noise sensitive receivers (NSRs) within 300m from the Project Boundary (i.e.
the assessment area) have been identified and the potential noise impacts from
the Project on these NSRs have been assessed. Appropriate noise mitigation
measures have been recommended where necessary.
Relevant environmental
legislations governing noise control are Noise Control Ordinance (NCO) (Cap.
400) and Environmental Impact Assessment Ordinance (EIAO) (Cap. 499). Relevant
assessment criteria and guidelines of the assessment approaches have been given
in the following Technical Memoranda issued under the NCO and EIAO:
·
Technical Memorandum on Noise from Construction Work other than
Percussive Piling (GW-TM); and
·
Annexes 5 and 13 of the EIAO-TM.
General Construction Works other than Percussive Pilling
during Non-restricted Hours
The NCO provides the statutory framework for noise control
in Hong Kong. Assessment procedures and standards are set out in the respective
TMs promulgated under NCO.
To ensure a better environment, the EIAO-TM promulgated
under the EIAO has imposed more stringent criteria for DP. For construction,
there is no statutory limit on daytime construction noise under the NCO and
related TMs. There is statutory control on construction noise during daytime on
general holidays (including Sundays). Nevertheless, Table 1B of Annex 5 of the EIAO-TM
stipulates criteria of 65 to 75dB(A) for daytime construction activities, as
shown in the following Table 4.1a.
Table
4.1a Noise Standards for General
Construction Activities during Non-restricted Hours
|
Noise
Sensitive Uses |
Noise
Standards(1)(2), Leq (30 min) dB(A) |
|
0700
– 1900 hours on any day not being a Sunday or general holiday |
|
|
All domestic premises including temporary
housing accommodation |
75 |
|
Hotel and hostels |
75 |
|
Educational institutions including kindergartens,
nurseries and all others where unaided voice communication is required |
70 65 (During examination) |
Notes:
(1)
The above standards
apply to uses that rely on opened windows for ventilation.
(2)
The above standards
should be viewed as the maximum permissible noise levels assessed at 1m from
the external facade.
General Construction Works other than Percussive Pilling
during Restricted Hours
The use of Powered Mechanical
Equipment (PME) for construction works other than percussive pilling during
restricted hours (i.e. 1900 to 0700 hours and at any time on Sundays or general
holidays) require a Construction Noise Permit (CNP). The assessment procedure
and noise criteria adopted by EPD for CNP application are specified in the
GW-TM issued under the NCO. The granting of a CNP subjects to the conditions
stated in the permit and it may be revoked at any time for failure to comply
with the permit conditions.
Maximum noise levels from
construction activities other than percussive pilling during restricted hours
at the NSRs shall not exceed the specified Acceptable Noise Levels (ANLs).
These ANLs are stipulated in accordance with the Area Sensitivity Ratings
(ASRs) established for the NSRs. A CNP may be granted provided that the ANLs
for the NSRs can be complied with. The corresponding Basic Noise Levels (BNLs)
are given in the GW-TM and summarized in Table 4.1b below.
Table
4.1b Noise Standards for General
Construction Activities during Restricted Hours
|
Area
Sensitivity Ratings |
Basic Noise
Levels, dB(A) |
|
|
All days
during the evening (1900 to 2300 hours), and general holidays (including
Sundays) during the daytime and evening (0700 to 2300 hours) |
All days
during the night-time (2300 to 0700 hours) |
|
|
ASR A |
60 |
45 |
|
ASR B |
65 |
50 |
|
ASR C |
70 |
55 |
The Noise Control Authority will
consider a well-justified CNP application, once filed, for construction works
within restricted hours as guided by the relevant TMs issued under the NCO. The
Noise Control Authority will take into account contemporary conditions /
situations of adjoining land uses and any previous complaints against
construction activities at the site before making a decision in granting a CNP.
Nothing in this EIA report shall bind the Noise Control Authority in making a
decision. If a CNP is to be issued, the Noise Control Authority shall include
in it any conditions. Failure to comply with any such conditions will lead to
cancellation of the CNP and prosecution under the NCO.
No construction works are
scheduled to be undertaken during noise control restricted hours of all days
during the evening and night-time (i.e. 19:00-07:00 hours); and all time during
Sundays and general holidays. Notwithstanding, it will be the Contractor’s
responsibility to apply for a CNP for any construction works planned to be
undertaken during restricted hours in accordance with the NCO.
For road traffic noise, the L10(1
hour) criteria are stipulated in Table 1A of Annex 5 of the EIAO-TM for
different types of NSRs, as shown in the following Table 4.2.
Table
4.2 Noise Standards for Road Traffic Noise
|
Common
Uses |
Noise
Standards(1)(2), L10(1
hour)
dB(A) |
|
Road Traffic Noise |
|
|
All domestic premises
including temporary housing accommodation |
70 |
|
Hotel and hostels |
70 |
|
Offices |
70 |
|
Educational institutions
including kindergartens, nurseries and all others where unaided voice
communication is required |
65 |
|
Places of public Worship and
courts of law |
65 |
|
Hospitals, clinics,
convalescences and homes for the aged, diagnostic rooms, wards |
55 |
Notes:
(1)
The above standards
apply to uses that rely on opened windows for ventilation.
(2)
The above standards
should be viewed as the maximum permissible noise levels assessed at 1m from the
external facade.
The location of the Project is
shown in Figure 1.1. The land use in the area within 300m from the Project Boundary
(i.e. the assessment area) is mainly rural and residential with low-rise
developments. The existing noise climate is dominated by the road traffic noise
from Kam Tin Road and Lam Kam Road. Potential noise sources which affect the
environment also include car repairing workshops and open storage sites located
in the vicinity of the Project.
With reference to Annex 13 of
the EIAO-TM, NSRs shall include residential uses (all domestic premises
including temporary housing), institutional uses (educational institutions
including kindergarten and nurseries), hospitals, medical clinics, homes for
the aged, convalescent homes, places of public worship, libraries, court of
law, performing arts centres, auditoria and amphitheatres, country park and
others.
Recent site visits and survey
have been conducted to support the validity of the findings. In accordance with
Annex 13 of the EIAO-TM, representative existing, committed and planned NSRs
within 300m from the Project Boundary (i.e. the assessment area) have been
identified for construction noise and road traffic noise impact assessments
based on the desktop reviews and recent site visits. The assessment area is
given in Figure 4.1.
To evaluate the construction and
operation noise impacts from the Project, the first layer of NSRs located
closest to the Project Boundary within the 300m assessment area, and with
direct line of sight to the Project, have been selected as representative NSRs
for noise prediction and evaluation. For the planned residential areas which
have yet constructed or occupied and/or no confirmed building layouts before
the commencement of the road works within the zoning, representative assessment
locations for these planned NSRs are assumed to be located at the respective
zone boundary, which would be the nearest to the Project, in order to assess
the worst-case scenario of the noise impacts upon the planned NSRs.
The representative existing, committed and planned NSRs are
identified by means of reviewing topographic maps, aerial photos, relevant
Outline Zoning Plans (OZPs) and other relevant published land use plans,
including plans and drawings published by Lands Department and land use and
development applications approved by the Town Planning Board, and supplemented
by site inspections. With reference to the relevant OZPs of Shek Kong (Plan
no.: S/YL-SK/9), Pat Heung (Plan no.: S/YL-PH/11), Lam Tsuen (Plan no.:
S/NE-LT/11), Kam Tin North (Plan no.: S/YL-KTN/9) and Kam Tin South (Plan no.:
S/YL-KTS/15), existing, committed and planned NSRs including domestic premises,
place for worship and elderly centre within the assessment area are identified
following the requirement of Annex 13 of the EIAO-TM.
For Kam Tin Clinic, it is
provided with insulated windows and central air-conditioning and does not rely
on openable window for ventilation. As such, noise affecting the clinic is
minimized.
According to Annex 13 of the
EIAO-TM, Lam Tsuen Country Park is a potential NSR. However, there is no
camping site located at Lam Tsuen Country Park within 300m assessment area. As
such, in view of the transient nature of visitors to the Country Park, any
potential construction and operation noise impacts on the visitors would not be
considered insurmountable and no adverse noise impact on Lam Tsuen Country Park
which are within 300m assessment area is anticipated. Hence, it was not
identified as a noise assessment point in the assessments.
In addition, it is confirmed
that no existing or future noise sensitive uses within Pat Heung Police Station
and Pat Heung Fire Station. Letters of confirmation are given in Appendix 4.1.
The representative NSRs which
are considered to be the worst-affected NSRs for construction and operation
noise impact assessments and the corresponding noise assessment points (NAP)
are summarised in Table 4.3 below and shown in Figure 4.2. Photographs of the identified
existing representative NSRs are provided in Appendix 4.2.
Table
4.3 Summary of the Identified
Representative NSRs
|
NAP ID |
NSRs Descriptions |
No. of
Storeys |
Height of
Assessment Points (mPD) |
Use |
Construction
Noise Assessment |
Construction
Noise Criteria, dB(A) |
Road Traffic
Noise Assessment |
Road Traffic
Noise Criteria, dB(A) |
|
Existing
NSRs |
||||||||
|
N01 |
Kam Kwong Nepali Christian Church |
1 |
8.2 |
Place for Worship |
Y |
70 |
Y |
65 |
|
N02 |
Village house, 37 Kiu Tau Tsuen |
1 |
7.2 |
Residential |
Y |
75 |
Y |
70 |
|
N03 |
Village house, Evergreen Garden |
2 |
9.0 11.8 |
Residential |
Y |
75 |
Y |
70 |
|
N04 |
Low-rise residential building, Block 7, Season Monarch |
3 |
9.9 12.7 15.5 |
Residential |
Y |
75 |
Y |
70 |
|
N05 |
Village house, Pang Ka Tsuen |
2 |
8.9 11.7 |
Residential |
Y |
75 |
Y |
70 |
|
N06 |
Village house, 18E Shek Kong San Tsuen |
1 |
10.8 |
Residential |
Y |
75 |
Y |
70 |
|
N07 |
Dormitory of Shek Kong Barrack |
3 |
11.7 14.5 17.3 |
Residential |
Y |
75 |
Y |
70 |
|
N08 |
Village house of Shek Kong San Tsuen |
2 |
11.9 14.7 |
Residential |
Y |
75 |
Y |
70 |
|
N09a |
Village house of Shek Kong San Tsuen |
2 |
10.9 13.7 |
Residential |
Y |
75 |
Y |
70 |
|
N09b |
Village house, 2A -2B Shek Kong San Tsuen |
3 |
10.9 13.7 16.5 |
Residential |
N |
75 |
Y |
70 |
|
N10 |
Low-rise residential building, 136 Seasons Villa |
2 |
12.7 15.5 |
Residential |
Y |
75 |
Y |
70 |
|
N11 |
Village house near Seasons Villa |
2 |
14.6 17.4 |
Residential |
Y |
75 |
Y |
70 |
|
N12 |
Village house near Seasons Villa |
2 |
14.1 16.9 |
Residential |
Y |
75 |
Y |
70 |
|
N13 |
Village house, 265 Kam Tin Road |
2 |
13.5 16.3 |
Residential |
Y |
75 |
Y |
70 |
|
N14 |
Village house next to Shek Kong Vegetable Marketing Cooperation
Society Limited |
2 |
16.0 18.8 |
Residential |
Y |
75 |
Y |
70 |
|
N15 |
Village house near Shek Kong Vegetable Station |
2 |
15.8 18.6 |
Residential |
Y |
75 |
Y |
70 |
|
N16 |
Village house, Chung Ying Yuen, Wang Toi Shan Tsoi Yuen Tsuen (North) |
2 |
16.8 19.6 |
Residential |
Y |
75 |
Y |
70 |
|
N17 |
Village house, Ching Yuen |
2 |
17.2 20.0 |
Residential |
Y |
75 |
Y |
70 |
|
N18 |
Village house, Lin Yuen, 78 Leung Uk Tsuen |
3 |
18.0 20.8 23.6 |
Residential |
Y |
75 |
Y |
70 |
|
N19 |
Village house, 107 Wang Toi Shan Hung Mo Tam |
1 |
18.2 |
Residential |
Y |
75 |
Y |
70 |
|
N20 |
Village house, Block 25, Green Villa |
3 |
19.7 22.5 25.3 |
Residential |
Y |
75 |
Y |
70 |
|
N21 |
Village house, Lee Ka Yuen, 27 Wang Toi Shan San Tsuen |
2 |
20.2 23.0 |
Residential |
Y |
75 |
Y |
70 |
|
N22 |
Village house, 28C Wang Toi Shan San Tsuen |
3 |
19.6 22.4 25.2 |
Residential |
Y |
75 |
Y |
70 |
|
N23 |
Village house, 27 Wang Toi Shan Yau Uk Tsuen |
1 |
22.2 |
Residential |
Y |
75 |
Y |
70 |
|
N24 |
Village house, Lodgewood, 72 Wang Toi Shan San Tsuen |
3 |
22.2 25.0 27.8 |
Residential |
Y |
75 |
Y |
70 |
|
N25 |
Village house, 50F Wang Toi Shan Yau Uk Tsuen |
3 |
22.9 25.7 28.5 |
Residential |
Y |
75 |
Y |
70 |
|
N26 |
Yan Wo Home for Aged |
3 |
23.0 25.8 28.6 |
Home for Aged |
Y |
75 |
Y |
70 |
|
N27 |
Village house, 94B Wang Toi Shan Lo Uk Tsuen |
3 |
23.9 26.7 29.5 |
Residential |
Y |
75 |
Y |
70 |
|
N28 |
Village house, 46 – 47 Wang Toi Shan Lo Uk Tsuen |
3 |
24.3 27.1 29.9 |
Residential |
Y |
75 |
Y |
70 |
|
N29 |
On Fuk Home for Aged |
3 |
25.3 28.1 30.9 |
Home for Aged |
Y |
75 |
Y |
70 |
|
N30 |
Village house, 30
Wang Toi Shan Lo Uk Tsuen |
2 |
25.0 27.8 |
Residential |
Y |
75 |
Y |
70 |
|
N31 |
Block 9, Evergreen
International Hong Kong Association |
3 |
25.6 28.4 31.2 |
Home for Aged |
Y |
75 |
Y |
70 |
|
N32 |
Village house, 1 Wang Toi Shan Lo Uk Tsuen |
2 |
29.4 32.2 |
Residential |
Y |
75 |
Y |
70 |
|
N33 |
Village house, Fau Wan Court |
3 |
38.8 41.6 44.4 |
Residential |
Y |
75 |
Y |
70 |
|
N34 |
Village house near Pine Hill Villa |
2 |
43.0 45.8 |
Residential |
Y |
75 |
Y |
70 |
|
N35 |
Village house, 410 Kam Tin Road |
2 |
42.6 45.4 |
Residential |
Y |
75 |
Y |
70 |
|
N36 |
Village house, Pine Hill Villa |
3 |
47.7 50.5 53.3 |
Residential |
Y |
75 |
Y |
70 |
|
N37 |
Village house, 23D Sheung Tsuen |
3 |
47.7 50.5 53.3 |
Residential |
Y |
75 |
Y |
70 |
|
N38 |
Village house, Hang Yuen, 25B Sheung Tsuen |
1 |
46.7 |
Residential |
Y |
75 |
Y |
70 |
|
N39 |
Village house, 7A Sheung Tsuen |
2 |
45.0 47.8 |
Residential |
Y |
75 |
Y |
70 |
|
N40 |
Village house, Yiu Court, 6 Sheung Tsuen |
3 |
45.8 48.6 51.4 |
Residential |
Y |
75 |
Y |
70 |
|
N41 |
Village house, 14A
Sheung Tsuen |
2 |
47.8 50.6 |
Residential |
Y |
75 |
Y |
70 |
|
N42 |
Village house, 6A
Sheung Tsuen |
2 |
46.5 49.3 |
Residential |
Y |
75 |
Y |
70 |
|
N43 |
Village house next
to Pat Heung Sheung Tsuen Village Office |
3 |
49.5 52.3 55.1 |
Residential |
Y |
75 |
Y |
70 |
|
N44 |
Village house, 4 Sheung Tsuen |
3 |
51.0 53.8 56.6 |
Residential |
Y |
75 |
Y |
70 |
|
N45 |
Village house, 3 Sheung Tsuen |
3 |
52.4 55.2 58.0 |
Residential |
Y |
75 |
Y |
70 |
|
N46 |
Village house, 9B Sheung Tsuen |
3 |
56.4 59.2 62.0 |
Residential |
Y |
75 |
Y |
70 |
|
N47 |
Cheung Chau Court |
7 |
59.9 62.7 65.5 68.3 71.1 73.9 76.7 |
Residential |
Y |
75 |
Y |
70 |
|
N48 |
4 Shropshire Road |
2 |
71.4 74.4 |
Residential |
Y |
75 |
Y |
70 |
|
N49 |
Village house, 3A Wong Chuk Yuen |
1 |
53.1 |
Residential |
Y |
75 |
Y |
70 |
|
N50 |
Village house of Wong Chuk Yuen |
1 |
63.2 |
Residential |
Y |
75 |
Y |
70 |
|
N51 |
Village house next to Tai Hing Farm |
1 |
71.5 |
Residential |
Y |
75 |
Y |
70 |
|
N52 |
Village house of Wong Chuk Yuen |
2 |
84.1 86.9 |
Residential |
Y |
75 |
Y |
70 |
|
N53 |
Village house, 151 Wong Chuk Yuen |
1 |
102.5 |
Residential |
Y |
75 |
Y |
70 |
|
N54 |
Village house |
2 |
135.7 138.5 |
Residential |
Y |
75 |
Y |
70 |
|
N55 |
Village house, 70 Lam Kam Road |
1 |
151.6 |
Residential |
Y |
75 |
Y |
70 |
|
N56 |
Lam Tsuen Country
Park(1) |
N/A |
N/A(1) |
Rural area |
N/A(1) |
N/A |
N/A(1) |
N/A |
|
N57 |
Village house,
opposite side of Kadoorie Experimental Farm |
1 |
158.7 |
Residential |
Y |
75 |
Y |
70 |
|
Committed /
Planned NSRs |
||||||||
|
P01 |
Planned Village
Type Development [V Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
3(3) |
9.0 11.8 14.6 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P02 |
Village house of Wing Lung Wai (under construction) |
3 |
8.0 10.8 13.6 |
Residential |
N(2) |
75 |
Y |
70 |
|
P03 |
Planned Residential
Development [R(D) Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
2(3) |
9.1 12.1 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P04 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
3(3) |
8.8 11.6 14.4 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P05 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
3(3) |
9.4 12.2 15.0 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P06 |
Planned Residential
Development (R(D) Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
2(3) |
11.1 14.1 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P07 |
Planned Residential
Development (R(C)2 Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
3(3) |
10.3 13.3 16.3 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P08 |
Village house near RCP opposite to bus stop (under
construction) |
3 |
24.0 26.8 29.6 |
Residential |
N(2) |
75 |
Y |
70 |
|
P09 |
Planned Village
Type Development (V Zone) at Pat Heung OZP [Statutory Plan No.: S/YL-PH/11] |
3(3) |
26.7 29.5 32.3 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P10 |
Planned village
house [Planning Application Case No.:
A/YL-PH/798] |
3(4) |
30.6 33.4 36.2 |
Residential |
N(2) |
75 |
Y |
70 |
|
P11 |
Planned Residential
Development (R(D) Zone) at Pat Heung OZP
[Statutory Plan No.: S/YL-PH/11] |
2(3) |
32.9 35.9 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P12 |
Planned residential
development [Planning Application Case No.:
A/YL-PH/736] |
2(4) |
53.9 56.9 |
Residential |
N(2) |
75 |
Y |
70 |
|
P13 |
Planned Village
Type Development (V Zone) at Shek Kong OZP [Statutory Plan No.: S/YL-SK/9] |
3(3) |
47.4 50.2 53.0 |
Residential |
N(2) |
N/A |
Y |
70 |
|
P14 |
Planned Village
Type Development (V Zone) at Shek Kong OZP [Statutory Plan No.: S/YL-SK/9] |
3(3) |
51.9 54.7 57.5 |
Residential |
N(2) |
N/A |
Y |
70 |
Remarks:
(1) N/A – Not Applicable. In
accordance with Annex 13 of the EIAO-TM, country parks are considered to be a
NSR. However, there is no camping site located at Lam Tsuen Country Park within
300m assessment area. As such, in view of the transient nature of visitors to
the Country Park, any potential construction and operation noise impacts on the
visitors would not be considered insurmountable and no adverse noise impact on
Lam Tsuen Country Park which are within 300m assessment area is anticipated.
Hence, it was not identified as a noise assessment point in the assessment.
(2) The planned NSRs under the
Outline Zoning Plans will only be considered during operation phase (i.e. road
traffic noise sources from the Project).
(3) Permitted maximum building
height or number of storey stated in the approved Outline Zoning Plan
(4) Number of storey stated in the
planning application
The construction of the Project
will commence in Year 2021 for completion in Year 2025. Based on the current
envisaged construction programme, potential construction noise impacts may
arise from the following key construction activities of the Project:
·
Site Clearance &
Utility Diversion;
· Road Upgrading Works (Backfill and reinstatement works);
· Street Furniture & Soft Landscape Works;
· ELS Works (Sheet piling and excavation works);
· Foundation and Substructure Works (Rebar fixing and
concreting works);
· Geotechnical Works (Soil nail works); and
· Construction of Superstructure Works (Noise mitigation
works)
These construction activities
will involve the use of Powered Mechanical Equipment (PME) such as drill rigs,
breakers, excavators, lorries, mobile cranes, concrete truck mixers, pokers,
rollers, etc.
In order to complete the works
within scheduled timeframe, the use of PME is unavoidable. Therefore, the use
of PME in daytime is expected to be the major noise source during the
construction phase of the Project.
No percussive piling works will be required within the Project Boundary.
Potential Cumulative Impacts
from Concurrent Project
Further to Chapter 2, there will
be four concurrent projects identified in the vicinity (within 500m from the
Project Boundary) during construction phase of the Project:
· Development of Organic Resources Recovery Centre (ORRC)
(Phase 3);
· Site Formation and Infrastructure Works for Developments at
Kam Tin South, Yuen Long - Advance Works;
· Improvement to Fan Kam Road; and
· Kam Tin – Pat Heung Sports Centre
As all the concurrent projects
would be land-based and provided that proper mitigation measures would be
proposed in EIA Study/environmental assessments and implemented in future
construction phase, only local-scale impacts arising from the construction
activities of these projects are anticipated.
Table 4.4 below summarises the potential concurrent projects
that would contribute to the cumulative noise impacts during construction
and/or operation phase.
Table 4.4 Potential
Cumulative Noise Impacts from Concurrent Projects
|
Concurrent
Project |
Project
Proponent |
Designated
Project |
Construction
Programme |
Potential
Cumulative Impacts |
|
|
Construction
Phase |
Operation
Phase |
||||
|
Development of Organic Resources Recovery Centre (ORRC)
(Phase 3) |
EPD |
Yes |
Tentatively scheduled to commence in 2023 and complete by
2026 |
Potential construction noise impact arisen from general
construction activities including the operation of PME is anticipated. However, the cumulative impact is not able to be taken
into account in this study as no detail information, construction methods and
activities can be provided from the concurrent project. Nevertheless,
according to EIAO, an EIA study of this concurrent project will be conducted,
and the cumulative impact will be addressed in the study. |
With reference to the Project Profile (No. PP-552/2017)[1],
no adverse noise impact is anticipated from the fixed noise sources during
the operation as the machineries will be enclosed in the waste reception
building and the required rotation speed for treatment plant is slow. Thus, no cumulative noise impact is anticipated during
operation phase of this concurrent project. |
|
Site Formation and Infrastructure Works for Developments
at Kam Tin South, Yuen Long - Advance Works |
CEDD |
No |
Commenced in 2018 and tentatively scheduled to complete
by 2021 |
No cumulative construction noise impact as only a works
area of minor road junction improvement works located around 300m away from
the Project. |
Potential operation noise impact of this concurrent
project would be the road traffic noise arising from the road widening works. With proposed noise barriers and/ or with LNRS suggested
in the Preliminary Environmental Review (PER)[2], there is no adverse
road traffic noise impact caused by this project. No cumulative noise impact
is anticipated during operation phase of this concurrent project. |
|
Improvement to Fan Kam Road |
HyD |
No |
The project is still under investigation stage and thus
no construction programme is consolidated. |
Potential construction noise impact arisen from general
construction activities including the operation of PME is anticipated. Referring to the Preliminary Environmental Review (PER)3
of this project, no detail construction information such as design and
construction programme can be provided. There would be potential cumulative noise impact if the
construction works are carried out concurrently within 300m assessment area
of the Project. Yet, regarding to the overlapping construction period of the
work fronts of two projects within 300m assessment area, cumulative noise
impact is considered as minimal |
Potential operation noise impact of this concurrent
project would be the road traffic noise arising from the road widening works. With proposed noise barriers and/ or with LNRS suggested
in the Preliminary Environmental Review (PER)[3], there is no adverse
road traffic noise impact caused by this project. No cumulative noise impact
is anticipated during operation phase of this concurrent project. |
|
Kam Tin – Pat Heung Sports Centre |
LCSD |
No |
No Construction Programme available as LCSD has not
engaged any parties to carry out the investigation for the project. |
Potential construction noise impact arisen from general
construction activities including the operation of PME is anticipated. However, the cumulative impact is not able to be taken
into account as no detail information such as design, construction and
operation details can be provided from the concurrent project. Nevertheless,
according to ETWB TCW No. 13/2003, a PER study of this concurrent project
will be conducted, and the cumulative impact will be addressed in the study. |
As there is no operation noise impact arising from a
sports centre, no cumulative noise impact is anticipated during operation
phase of this concurrent project. |
Sound Power Levels (SWLs) of the
proposed PME has been assigned according to Table 3 of the GW-TM issued under
the NCO and other commonly used PME under the guidance note for licence
application. The construction noise impact at representative NSRs has been
assessed based on the assessment methodology as specified in the GW-TM and
Annex 13 of the EIAO-TM.
It is assumed that all PME
required for a particular construction activity would be located at the
notional source position of the road section where such activity is to be
performed. To predict the noise level, PME is divided into groups required
for each construction activity. The sound pressure level of each
construction activity is calculated based on the number of PME and distance
from the NSR.
Acoustics correction factors
such as façade, distance attenuation and potential noise screening effect have
been considered in the calculation. A positive 3 dB façade correction has been
applied to the predicted noise levels to account for the façade effect at each
noise assessment point.
The assessment has been
conducted based on the construction plant inventory confirmed by the Project Engineer
as listed in Appendix 4.3. The number for each PME
would be one within each construction work front. The percentage on-time for
each PME has been assessed based on 30-minute working periods and details are
given in Appendix 4.3. Practically, the PMEs will not be operating for all times
within a work front. The utilization rates would depend on the construction
sequences and construction nature. Appendix 4.3 tabulates the adopted utilization rates.
The construction plant inventory has been developed together with the
construction programme to achieve the completion dates as given in Appendix 4.4. As confirmed by the Project
Engineer, the proposed construction plant
inventory, including the type, quantity of the PME and their utilisation rate,
is appropriate and practicable for completing the works within the proposed
construction programme.
The geotechnical works and the
retaining wall construction will only be carried out at the locations as
indicate in Figure 2.4. Road works and
construction of geotechnical works and retaining wall have been included in the
assessment on NSRs where locates within 300m from the work front.
These construction activities would not be conducted concurrently. The Project engineer has confirmed that this restriction
is practicable. Tentative construction works programme is given in Appendix
4.4.
Kam Tin Road and Lam
Kam Road are single two-lane carriageway. Due to the fact that temporary
road traffic management is not allowing long road closure (> 50m) on one
lane for single carriageway, each active construction activity location shall
be about 50m in length at one lane of the road alignment at any one
time. For road works of 50m, the operation duration of construction
activities for each work front is estimated and tabulated in Appendix 4.5.
Assessment has been conducted
based on the assumption that the road works will be carried out section by
section and the length of each active work front is about 50m; and based on preliminary design arrangement by the Project Engineer,
the minimum separation of each
active work front is 600m. As such, cumulative construction noise
from concurrent works of active work front is not anticipated. The
affected area due to construction works will be limited as each active work
front will be restricted to about 50m in length and about 600m distance
separation between two active work fronts should be maintained. Accordingly, it
is anticipated that each NSR can only be affected by one active work front at
any one time. It is confirmed by the Project Engineer that the above work
front arrangements are practicable. Location plan with indication of the
construction work fronts is shown in Figure 2.5.
Unmitigated Scenario
Table 4.5 summarizes the predicted maximum construction noise
levels at the representative NSRs under the unmitigated scenario. Detailed
calculations of the noise levels are provided in Appendix 4.6. Horizontal distance between
notional sources and the NSRs is presented in Figure 4.3.
Table 4.5 Predicted Maximum Construction Noise Levels at the
Representative NSRs (Unmitigated Scenario)
|
NSR
Descriptions |
Noise Criteria, dB(A) |
Predicted Maximum Noise Levels (Leq
(30min)), dB(A) |
|
|
N01 |
Kam Kwong Nepali
Christian Church |
70 |
61 |
|
N02 |
Village house, 37
Kiu Tau Tsuen |
75 |
59 |
|
N03 |
Village house,
Evergreen Garden |
75 |
75 |
|
N04 |
Low-rise
residential building, Block 7, Season Monarch |
75 |
73 |
|
N05 |
Village house, Pang
Ka Tsuen |
75 |
78 |
|
N06 |
Village house, 18E
Shek Kong San Tsuen |
75 |
90 |
|
N07 |
Dormitory of Shek
Kong Barrack |
75 |
79 |
|
N08 |
Village house of
Shek Kong San Tsuen |
75 |
78 |
|
N09a |
Village house of
Shek Kong San Tsuen |
75 |
84 |
|
N10 |
Low-rise
residential building, 136 Seasons Villa |
75 |
78 |
|
N11 |
Village house near
Seasons Villa |
75 |
99 |
|
N12 |
Village house near
Seasons Villa |
75 |
83 |
|
N13 |
Village house, 265
Kam Tin Road |
75 |
78 |
|
N14 |
Village house next
to Shek Kong Vegetable Marketing Cooperation Society Limited |
75 |
81 |
|
N15 |
Village house near
Shek Kong Vegetable Station |
75 |
80 |
|
N16 |
Village house,
Chung Ying Yuen, Wang Toi Shan Tsoi Yuen Tsuen (North) |
75 |
80 |
|
N17 |
Village house,
Ching Yuen |
75 |
86 |
|
N18 |
Village house, Lin
Yuen, 78 Leung Uk Tsuen |
75 |
79 |
|
N19 |
Village house, 107
Wang Toi Shan Hung Mo Tam |
75 |
77 |
|
N20 |
Village house,
Block 25, Green Villa |
75 |
77 |
|
N21 |
Village house, Lee
Ka Yuen, 27 Wang Toi Shan San Tsuen |
75 |
84 |
|
N22 |
Village house, 28C
Wang Toi Shan San Tsuen |
75 |
86 |
|
N23 |
Village house, 27
Wang Toi Shan Yau Uk Tsuen |
75 |
80 |
|
N24 |
Village house,
Lodgewood, 72 Wang Toi Shan San Tsuen |
75 |
82 |
|
N25 |
Village house, 50F
Wang Toi Shan Yau Uk Tsuen |
75 |
82 |
|
N26 |
Yan Wo Home for Aged |
75 |
82 |
|
N27 |
Village house, 94B
Wang Toi Shan Lo Uk Tsuen |
75 |
74 |
|
N28 |
Village house, 46 –
47 Wang Toi Shan Lo Uk Tsuen |
75 |
84 |
|
N29 |
On Fuk Home for
Aged |
75 |
76 |
|
N30 |
Village house, 30
Wang Toi Shan Lo Uk Tsuen |
75 |
81 |
|
N31 |
Block 9, Evergreen
International Hong Kong Association |
75 |
78 |
|
N32 |
Village house, 1 Wang Toi Shan Lo Uk Tsuen |
75 |
81 |
|
N33 |
Village house, Fau Wan Court |
75 |
79 |
|
N34 |
Village house near
Pine Hill Villa |
75 |
78 |
|
N35 |
Village house, 410
Kam Tin Road |
75 |
81 |
|
N36 |
Village house, Pine
Hill Villa |
75 |
86 |
|
N37 |
Village house, 23D
Sheung Tsuen |
75 |
81 |
|
N38 |
Village house, Hang
Yuen, 25B Sheung Tsuen |
75 |
79 |
|
N39 |
Village house, 7A
Sheung Tsuen |
75 |
86 |
|
N40 |
Village house, Yiu
Court, 6 Sheung Tsuen |
75 |
81 |
|
N41 |
Village house, 14A
Sheung Tsuen |
75 |
83 |
|
N42 |
Village house, 6A
Sheung Tsuen |
75 |
82 |
|
N43 |
Village house next
to Pat Heung Sheung Tsuen Village Office |
75 |
74 |
|
N44 |
Village house, 4 Sheung Tsuen |
75 |
78 |
|
N45 |
Village house, 3 Sheung Tsuen |
75 |
77 |
|
N46 |
Village house, 9B Sheung Tsuen |
75 |
76 |
|
N47 |
Cheung Chau Court |
75 |
71 |
|
N48 |
4 Shropshire Road |
75 |
70 |
|
N49 |
Village house, 3A
Wong Chuk Yuen |
75 |
84 |
|
N50 |
Village house of
Wong Chuk Yuen |
75 |
83 |
|
N51 |
Village house next
to Tai Hing Farm |
75 |
89 |
|
N52 |
Village house of
Wong Chuk Yuen |
75 |
81 |
|
N53 |
Village house, 151
Wong Chuk Yuen |
75 |
83 |
|
N54 |
Village house |
75 |
84 |
|
N55 |
Village house, 70
Lam Kam Road |
75 |
91 |
|
N56 |
Lam Tsuen Country
Park |
N/A(1) |
N/A(1) |
|
N57 |
Village house,
opposite side of Kadoorie Experimental Farm |
75 |
72 |
Note: Noise levels exceeding the construction
noise criteria are bolded and underlined.
(1)
N/A – Not Applicable. In accordance with Annex 13 of the EIAO-TM,
country parks are considered to be a NSR. However, there is no camping site
located at Lam Tsuen Country Park within 300m assessment area. As such, in view
of the transient nature of visitors to the Country Park, any potential
construction and operation noise impacts on the visitors would not be
considered insurmountable and no adverse noise impact on Lam Tsuen Country Park
which are within 300m assessment area is anticipated. Hence, it was not identified
as a noise assessment point in the assessments
In the absence of noise
mitigation measures, exceedances of noise criteria range from 1 to 24 dB(A) for
existing residential premises. Mitigation measures are therefore required. No noise exceedance on noise
sensitive uses other than the existing residential premises.
The predicted noise levels show
that the unmitigated construction noise impacts would exceed the daytime noise
criteria. Mitigation measures are therefore required. The following mitigation
measures have been considered:
·
Good site practices to limit noise emissions at the source;
·
Use of quality powered mechanical equipment (QPME);
·
Use of temporary noise barrier, enclosure and/or noise insulation fabric
to screen noise from relatively static PMEs; and
·
Alternative quiet construction method
The above mitigation measures
would need to be implemented in the work fronts as good practices where
appropriate. Detailed descriptions of these mitigation measures are given in
the following sections.
Good site practices can reduce
the noise impacts on affected NSRs, although the effectiveness of these
practices can vary depending on actual site conditions, and hence it is difficult
to quantify effectiveness. The recommended practices are as follows:
·
PME should be kept to
a minimum and the parallel use of them should be avoided;
·
Intermittent use of
PME which can be shut down between work periods or throttled down to a
minimum;
·
Mobile PME should be
sited as far from NSRs as possible;
·
PME known to emit
noise strongly in one direction should be orientated to direct away from the
nearby NSRs; and
·
Only well-maintained
plant should be operated on-site and PME should be serviced regularly during
the construction programme.
For the use of quiet plant
associated with the construction works, reference has been made to the PME
listed in the QPME system and other commonly used PME listed in the
EPD website, which contains the SWLs for specific quiet PME. The SWLs
for quiet PME adopted for the assessment are detailed in Appendix 4.3. The type of quiet PME
adopted in this assessment is for reference only. The Contractors may adopt
alternative quiet PME with the same or lower SWL as long as it can be
demonstrated that they would not result in construction noise impacts worse
than those predicted in this assessment.
A summary of the quiet PME
adopted for various PME and the associated quiet plant reference number is
given in Appendix
4.3 and summarised in below Table 4.6a.
Table 4.6a Summary
of Quiet PME Adopted
|
PME |
CNP Reference No. |
Quiet Plant Reference No. |
|
Breaker, hand-held, mass>
10kg and <20kg |
CNP 024 |
EPD-06880 |
|
Excavator/ Loader, wheeled/
tracked |
CNP 081 |
EPD-02667 |
|
Generator, portable |
(1) |
EPD-08242 |
|
Asphalt paver |
CNP 004 |
EPD-04278 |
|
Roller, vibratory |
CNP 186 |
EPD-03754 |
|
Breaker, excavator mounted
(pneumatic) |
CNP 027 |
EPD-06880 (2) |
|
Piling, vibrating hammer |
(1) |
(3) |
|
Concrete lorry mixer |
CNP 044 |
CNP 045 (4) |
|
Air Compressor, air
flow>10m3/min and <=30m3/min |
CNP 002 |
EPD-08976 |
|
Concrete pump,
stationary/lorry mounted |
CNP 047 |
CNP 047 (5) |
|
Crane, mobile/barge mounted
(diesel) |
CNP 048 |
EPD-07648 |
Notes:
(1) Extracted from EPD document
namely, "Sound Power Levels of Other Commonly Used PME"
(2) Hand-held breaker is proposed as
alternative construction equipment for excavator mounted breaker in mitigated
scenario and the practicability is confirmed by the Project Engineer.
(3) Silent Piling by Press-in
Method, extracted from EPD website namely, "Quieter Construction
Methods"
(4) It is recommended that in-situ
concrete mixing method using concrete mixer (electric) should be adopted for
works at work front Zone 23A (as shown in Figure 2.5) which construction noise level
to the nearest NSR (i.e. N11) exceeds the construction noise criteria though
the recommended measures mentioned in Sections 4.5.4.1 to 4.5.4.3 have been
implemented.
(5) Stationary concrete pump is
proposed in mitigated scenario and the practicability is confirmed by the
Project Engineer.
To alleviate the construction
noise impact on the affected NSRs, construction noise barrier, enclosure and/or
noise insulation fabric would be erected to provide screening from the
construction plant. It is
anticipated that suitably designed barriers could achieve at least 5dB(A)
reduction for movable plant and 10dB(A) for stationary plant. A typical design which has been
used locally is a wooden framed barrier with a small-cantilevered upper portion
of superficial density no less than 10kg/m2 on a skid footing with
50mm thick internal sound absorptive lining. No sound leaks should be allowed
through the barriers due to holes, slits, cracks, openings or gaps.
The use of full enclosure has
been considered in this assessment to shelter relatively static plant such as
generator. These enclosures can provide about 15 dB(A) noise
reduction. Acoustic enclosures, which completely cover the noisy part of PME,
can also provide significant noise reduction. 15 dB(A) of noise reduction is
assumed as enclosing the hand-held breaker in an acoustic enclosure with
suitable ventilation.
Noise insulation fabric should
also be adopted for certain PME such as drill rig, vibrating hammer and rock
drill etc. It should be lapped such that there are no openings or gaps on the
joints. A noise reduction of 10 dB(A) can be achieved for the PME lapped with
noise insulation fabric.
A summary of the movable
temporary noise barrier, enclosure and noise insulation fabric adopted for
various PME is given in Appendix 4.3 and the associated noise reduction is summarised in
below Table 4.6b.
Table 4.6b Summary
of Temporary Noise Barrier / Enclosure / Noise Insulation Fabric Adopted for
PME
|
PME |
Barrier / Enclosure / Noise Insulation Fabric |
Attenuation, dB(A) |
|
Air Compressor, air
flow>10m3/min and <=30m3/min |
Barrier |
-10 |
|
Asphalt paver |
Barrier |
-5 |
|
Breaker, hand-held, mass>
10kg and <20kg |
Enclosure |
-15 |
|
Concrete lorry mixer |
Barrier |
-5 |
|
Concrete pump, stationary/lorry
mounted (1) |
Barrier |
-10 |
|
Crane, mobile/barge mounted
(diesel) |
Barrier |
-5 |
|
Drill rig |
Noise insulation fabric |
-10 |
|
Dump Truck, gross vehicle
weight>5.5tonne and <=38tonne |
Barrier |
-5 |
|
Excavator/ Loader, wheeled/
tracked |
Barrier |
-5 |
|
Generator, portable |
Enclosure |
-15 |
|
Lorry, gross vehicle
weight>5.5tonne and <=38tonne |
Barrier |
-5 |
|
Piling, vibrating hammer |
Noise insulation fabric |
-10 |
|
Rock drill, hand-held
(pneumatic) |
Noise insulation fabric |
-10 |
|
Roller, vibratory |
Barrier |
-5 |
Notes:
(1)
Stationary concrete
pump is proposed in mitigated scenario and the practicability is confirmed by
the Project Engineer.
Traditional sheet piling works
at hard ground would result in significant noise impacts to the nearby NSRs.
Alternative quiet constriction method such as silent piling by press-in method
has been considered in this assessment. A sheet pile is clipped and pressed
under the ground. Noise can be minimized by press-in sheet piles with drilling
simultaneously for piling works at harder ground. The noise impact can also be
further reduced as the piling works can be completed within the shorter
duration by using this method.
Hand-held breaker is proposed as
alternative construction equipment for pneumatic excavator mounted breaker for
ELS works in all work fronts under mitigated scenario. As such, QPME reference,
EPD-06880, with SWL of 108 dB(A) is recommended. The practicability is confirmed by the Project
Engineer.
Stationary concrete pump is proposed as alternative construction
equipment for mobile plant of lorry mounted concrete pump for geotechnical
works in all work fronts under mitigated scenario. Therefore, noise barrier,
with noise reduction of 10 dB(A), could be adopted to alleviate the noise
emitted from stationary concrete pump. The
practicability is confirmed by the Project Engineer.
In addition to the implementation of recommended measures
in Sections 4.5.4.1 to 4.5.4.3, it is also recommended that in-situ concrete
mixing method using concrete mixer (electric) should be adopted for works at
work front Zone 23A (as shown in Figure
2.5) which construction noise level to the nearest NSR (i.e.
N11) exceeds the construction noise criteria. Concrete mixer (electric) has a
lower SWL than the concrete lorry mixer and the construction noise level of
using this PME in the work front could be further reduced. No construction
noise level exceedance at N11 is anticipated after adoption of concrete mixer
(electric) in Zone 23A.
Noise reduction from the use of
mitigation measures including quiet plant, the use of construction noise
barrier, enclosure and/or noise insulation fabric and alternative quieter
construction methods as described above has been applied in the
assessment. Detailed results of construction noise assessment for
mitigated scenario are given in Appendix
4.7.
Mitigated Scenario
After implementation of
mitigation measures, the predicted maximum construction noise levels at the
representative NSRs are summarized in Table 4.7 and detailed calculations are provided in Appendix 4.7.
Table 4.7 Predicted Maximum Construction Noise Levels at the
Representative NSRs (Mitigated Scenario)
|
NAP ID |
NSR Descriptions |
Noise
Criteria, dB(A) |
Predicted
Maximum Noise Levels (Leq (30min)), dB(A) |
|
N01 |
Kam Kwong Nepali Christian Church |
70 |
45 |
|
N02 |
Village house, 37 Kiu Tau Tsuen |
75 |
43 |
|
N03 |
Village house, Evergreen Garden |
75 |
62 |
|
N04 |
Low-rise residential building, Block 7, Season Monarch |
75 |
61 |
|
N05 |
Village house, Pang Ka Tsuen |
75 |
62 |
|
N06 |
Village house, 18E Shek Kong San Tsuen |
75 |
75 |
|
N07 |
Dormitory of Shek Kong Barrack |
75 |
64 |
|
N08 |
Village house of Shek Kong San Tsuen |
75 |
62 |
|
N09a |
Village house of Shek Kong San Tsuen |
75 |
70 |
|
N10 |
Low-rise residential building, 136 Seasons Villa |
75 |
61 |
|
N11 |
Village house near Seasons Villa |
75 |
75 |
|
N12 |
Village house near Seasons Villa |
75 |
66 |
|
N13 |
Village house, 265 Kam Tin Road |
75 |
66 |
|
N14 |
Village house next to Shek Kong Vegetable Marketing Cooperation
Society Limited |
75 |
65 |
|
N15 |
Village house near Shek Kong Vegetable Station |
75 |
65 |
|
N16 |
Village house, Chung Ying Yuen, Wang Toi Shan Tsoi Yuen Tsuen (North) |
75 |
65 |
|
N17 |
Village house, Ching Yuen |
75 |
70 |
|
N18 |
Village house, Lin Yuen, 78 Leung Uk Tsuen |
75 |
63 |
|
N19 |
Village house, 107 Wang Toi Shan Hung Mo Tam |
75 |
62 |
|
N20 |
Village house, Block 25, Green Villa |
75 |
61 |
|
N21 |
Village house, Lee Ka Yuen, 27 Wang Toi Shan San Tsuen |
75 |
71 |
|
N22 |
Village house, 28C Wang Toi Shan San Tsuen |
75 |
70 |
|
N23 |
Village house, 27 Wang Toi Shan Yau Uk Tsuen |
75 |
64 |
|
N24 |
Village house, Lodgewood, 72 Wang Toi Shan San Tsuen |
75 |
67 |
|
N25 |
Village house, 50F Wang Toi Shan Yau Uk Tsuen |
75 |
66 |
|
N26 |
Yan Wo Home for Aged |
75 |
67 |
|
N27 |
Village house, 94B Wang Toi Shan Lo Uk Tsuen |
75 |
61 |
|
N28 |
Village house, 46 – 47 Wang Toi Shan Lo Uk Tsuen |
75 |
71 |
|
N29 |
On Fuk Home for Aged |
75 |
64 |
|
N30 |
Village house, 30 Wang Toi Shan Lo Uk Tsuen |
75 |
68 |
|
N31 |
Block 9, Evergreen International Hong Kong Association |
75 |
65 |
|
N32 |
Village house, 1 Wang Toi Shan Lo Uk Tsuen |
75 |
66 |
|
N33 |
Village house, Fau Wan Court |
75 |
63 |
|
N34 |
Village house near Pine Hill Villa |
75 |
62 |
|
N35 |
Village house, 410 Kam Tin Road |
75 |
65 |
|
N36 |
Village house, Pine Hill Villa |
75 |
69 |
|
N37 |
Village house, 23D Sheung Tsuen |
75 |
65 |
|
N38 |
Village house, Hang Yuen, 25B Sheung Tsuen |
75 |
64 |
|
N39 |
Village house, 7A Sheung Tsuen |
75 |
70 |
|
N40 |
Village house, Yiu Court, 6 Sheung Tsuen |
75 |
65 |
|
N41 |
Village house, 14A Sheung Tsuen |
75 |
68 |
|
N42 |
Village house, 6A
Sheung Tsuen |
75 |
67 |
|
N43 |
Village house next
to Pat Heung Sheung Tsuen Village Office |
75 |
62 |
|
N44 |
Village house, 4
Sheung Tsuen |
75 |
65 |
|
N45 |
Village house, 3 Sheung Tsuen |
75 |
64 |
|
N46 |
Village house, 9B Sheung Tsuen |
75 |
63 |
|
N47 |
Cheung Chau Court |
75 |
55 |
|
N48 |
4 Shropshire Road |
75 |
54 |
|
N49 |
Village house, 3A Wong Chuk Yuen |
75 |
68 |
|
N50 |
Village house of Wong Chuk Yuen |
75 |
65 |
|
N51 |
Village house next to Tai Hing Farm |
75 |
70 |
|
N52 |
Village house of Wong Chuk Yuen |
75 |
63 |
|
N53 |
Village house, 151 Wong Chuk Yuen |
75 |
65 |
|
N54 |
Village house |
75 |
66 |
|
N55 |
Village house, 70 Lam Kam Road |
75 |
75 |
|
N56 |
Lam Tsuen Country Park |
N/A(1) |
N/A |
|
N57 |
Village house,
opposite side of Kadoorie Experimental Farm |
75 |
56 |
Note: Noise
levels exceeding the construction noise standards are bolded and
underlined.
(1)
N/A – Not Applicable. In accordance with Annex 13 of the EIAO-TM,
country parks are considered to be a NSR. However, there is no camping site
located at Lam Tsuen Country Park within 300m assessment area. As such, in view
of the transient nature of visitors to the Country Park, any potential
construction and operation noise impacts on the visitors would not be
considered insurmountable and no adverse noise impact on Lam Tsuen Country Park
which are within 300m assessment area is anticipated. Hence, it was not
identified as a noise assessment point in the assessments.
The above Table 4.7 shows that construction noise impact arising from the
Project at all existing NSRs will be mitigated after implementation of the
recommended noise mitigation measures. The cumulative construction noise impact
of the four potential concurrent projects are evaluated in Section 4.5.1.
Construction noise impact
arising from the Project can be properly mitigated by implementing the proposed
noise mitigation measures. Residual noise impacts are thus not anticipated. No
existing NSR would be exposed to residual noise impact exceeding the criteria
set in Annex 5 of the EIAO-TM.
However, the Contractor shall
prepare a construction noise mitigation plan detailing the temporary and
permanent mitigation measures for construction noise impact arising from the
Project before the commencement of construction works. All the noise mitigation
measures as set out in the construction noise mitigation plan shall be
implemented and properly maintained during the construction phase of the
Project to minimize the noise impact to nearby NSRs.
Road traffic noise from the road
network within the assessment area would be the major noise source during the
operation phase. Road sections included in the 300m assessment area are
indicated in Figure 4.4.
The road traffic noise levels
have been predicted by the RoadNoise Model which follows the calculation
procedure as provided in the “Calculation of Road Traffic Noise” (CRTN) issued
by the UK Department of Transport in 1988. The noise levels are presented in
terms of noise levels exceeded for 10% of the one-hour period during the peak
traffic flow, i.e. L10(1hour) dB(A).
The road sections within 300m
from the Project Boundary have been included in the assessment. The traffic
speed for all roads including Kam Tin Road and Lam Kam Road to be adopted in
the road traffic noise model is 50km/h and a section of Kam Tin Bypass (~40m in
length within the assessment area) is 70km/h. The road surface type of the
existing road is bitumen or concrete except a section of Kam Tin Bypass. The
existing roadside noise barriers along Kam Tin Bypass and Tung Wui Road have
been included in the assessment. The road alignments, surrounding buildings and
all other structures that could have noise screening have been inputted in the
road traffic noise model.
The roads are divided into
segments and each of the road segment assigned a road width, road surface type,
road design speed and traffic volume with percentage of heavy vehicles. Road traffic
noise levels shall be calculated at the noise assessment points, which are 1.2m
above each floor and 1m away from the façade of the selected representative
NSRs.
Table 4.8 presents
the assumptions of the road surface types and traffic speeds in the road
traffic noise models for the road sections.
Table
4.8 Assumptions in
Road Traffic Noise Model
|
Road Sections |
Type of Road Surface |
Traffic Speed
(km/hr) |
|
Remaining sections of Kam Tin
Road |
Concrete / Bitumen Road Surface |
50 |
|
Lam Kam Road |
Concrete / Bitumen Road Surface |
50 |
|
a section of Kam Tin Bypass (~40m in length within the assessment
area) |
Pervious Road Surface |
70 |
|
Other road sections such as Fan Kam Road, Kam Sheung
Road, Route Twisk and Tung Wui Road etc. |
Concrete / Bitumen Road Surface |
50 |
According to Section 5.1 in Annex
13 of the EIAO-TM and EIAO Guidance Note “Road Traffic Noise Impact Assessment
under the Environmental Impact Assessment Ordinance” [GN 12/2010], road traffic
noise impact shall be assessed based on the peak hour traffic flow for the
worst year within 15 years upon commencement of operation of the Project. Based
on the latest project programme, the proposed road upgrading works under the
Project are scheduled to commence in Year 2021 and be operated in Year 2025.
The assessment year for road traffic noise is thus taken as Year 2040 which is
the maximum traffic projection within 15 years after full operation of the
proposed roadwork. Comparing to the traffic flow in AM peak hour, the traffic
flow in PM peak hour of 1800-1900 is generally higher, thus it is used for
assessing the worst-case scenario. The PM peak data of Year 2021 and Year 2040 for
with and without Project scenarios accepted by the Transport Department (TD) is
given in Appendix 4.8. The letter of acceptance of
the proposed methodology of traffic forecast by the TD is provided in Appendix 4.9.
The following scenarios have
been assessed in the impact assessment:
·
Unmitigated scenario
in Year 2040 (i.e. worst-case year with the Project and without any noise
mitigation
measures);
·
Mitigated scenario in
Year 2040 (i.e. worst-case year with the Project and with direct noise mitigation
measures);
·
Without Project
scenario in Year 2040 (i.e. worst-case year without the Project and without mitigation
measures); and
·
Prevailing scenario
in Year 2021 (i.e. the year before commencement of construction works and
without
mitigation measures) for indirect technical remedies eligibility assessment.
As discussed in Section 2.6 of
Chapter 2, the sections of Kam Tin Road and Lam Kam Road to be upgraded are
rural roads serving many roadside residence and developments. Hence, the proposed road alignment
follows closely with the existing alignment. In addition, the proposed road alignment
is designed based on the principle of minimizing land resumption and
environmental impacts. Thus, the adoption of alternative alignment, as stated in Section 6.1 of
Annex 13 of the EIAO-TM, as mitigation measure is considered not practicable.
Consideration of direct noise mitigation measures,
such as noise barriers and low noise road surfacing (LNRS), follows Annex 13 of
the EIAO-TM and EIAO Guidance Note No. 12/2010.
Under unmitigated scenario,
direct mitigation measures will be required in the situations where:
·
The predicted road traffic noise
level exceeds the criteria in Table 1A of
Annex 5 of the EIAO-TM; or
· If the NSRs are affected by
noise from the other existing roads, direct mitigation measures are
required to reduce the noise from the road project to
a level that
(i)
is not higher than the noise standard; and
(ii)
has no significant contribution (less than 1.0 dB(A)) to the overall
noise from other existing roads, if the cumulative noise level (i.e. noise from
the road project together with other existing roads) exceeds the noise
standard.
When considering barrier as
direct noise mitigation measure, reference has been made to the “Guidelines on
Design of Noise Barriers” jointly published by the Environmental Protection
Department and the Highways Department. Consideration has been given to a
number of factors including but not limited to engineering constraints;
acoustic effectiveness (including noise levels and details with respect to the
extent of the mitigation measure concerns and the NSRs intended to be
protected); fire safety considerations; sightline and road safety
considerations; landscape and visual impact; and public objections, etc.
With reference to Appendix
4.12, the major constraints for
construction of noise barriers are the “blockage of existing access” and the “interfere
with commercial activities or cause social disruptions / resident objections”. The
construction of nose enclosure will also encounter similar and even larger
engineering constraints as those for noise barriers. If noise enclosures are
adopted, same constraints are still applicable and it is also necessary to
consider any similar constraints at the opposite side of the road, in view of
the common structural form of a noise enclosure (i.e. column and foundation
supports at both sides of the concerned road). Therefore, noise enclosure is not the preferable
mitigation measure when comparing the number of constraints with the noise
barrier option.
For LNRS, general technical constraints of its
application such as vertical gradient, frequent sharp turning/braking, roadside
parking, distance between junction/signalized crossing/zebra crossing and
jointing on concrete pavement should be taken into consideration.
If any façades of NSRs are still
exposed to predicted noise levels exceeding the relevant noise criteria after
the implementation of all practicable direct mitigation measures based on the
considerations under Section 4.6.3, provision of indirect technical remedies in
the form of acoustic insulation and air conditioning should be considered under
the EIAO-TM and EIAO Guidance Note No. 12/2010. The eligibility for indirect
technical remedies would be tested against the following three criteria:
·
The predicted overall
noise level from the Project, together with other road traffic noise in the
vicinity must be above a specified noise level (for example, 70 dB(A) for
domestic premises and 65 dB(A) for educational institutions. All are in L10(1hour));
·
The predicted overall
noise level is at least 1.0 dB(A) more than the prevailing road traffic noise
level, i.e. the total road traffic noise level existing before the works to
construct the road were commenced; and
·
The contribution to
the increase in the predicted overall noise level from the road project must be
at least 1.0 dB(A).
The road traffic noise levels at the sensitive facades of
the chosen representative existing, committed and planned NSRs were calculated
in accordance with the Calculation of Road Traffic Noise (CRTN) procedures.
Unmitigated Scenario
Table 4.9 summarizes the predicted maximum road traffic noise
levels at the representative NSRs under the unmitigated scenario. Detailed
calculations of the predicted road traffic noise
levels at the representative NSRs under the unmitigated scenario in Year 2040
are shown in Appendix
4.11.
Table
4.9 Predicted Maximum Traffic Noise Levels
at the Representative NSRs (Unmitigated
Scenario)
|
NAP ID |
NSR Descriptions |
Noise
Criteria, dB(A) |
Predicted
Maximum Noise Levels (L10(1 hour)), dB(A) |
|
N01 |
Kam Kwong Nepali Christian Church |
65 |
74 |
|
N02 |
Village house, 37 Kiu Tau Tsuen |
70 |
64 |
|
N03 |
Village house, Evergreen Garden |
70 |
72 |
|
N04 |
Low-rise residential building, Block 7, Season Monarch |
70 |
72 |
|
N05 |
Village house, Pang Ka Tsuen |
70 |
75 |
|
N06 |
Village house, 18E Shek Kong San Tsuen |
70 |
81 |
|
N07 |
Dormitory of Shek Kong Barrack |
70 |
79 |
|
N08 |
Village house of Shek Kong San Tsuen |
70 |
73 |
|
N09a |
Village house of Shek Kong San Tsuen |
70 |
73 |
|
N09b |
Village house, 2A -2B Shek Kong San Tsuen |
70 |
74 |
|
N10 |
Low-rise residential building, 136 Seasons Villa |
70 |
69 |
|
N11 |
Village house near Seasons Villa |
70 |
80 |
|
N12 |
Village house near Seasons Villa |
70 |
75 |
|
N13 |
Village house, 265 Kam Tin Road |
70 |
77 |
|
N14 |
Village house next to Shek Kong Vegetable Marketing Cooperation
Society Limited |
70 |
77 |
|
N15 |
Village house near Shek Kong Vegetable Station |
70 |
81 |
|
N16 |
Village house, Chung Ying Yuen, Wang Toi Shan Tsoi Yuen Tsuen (North) |
70 |
76 |
|
N17 |
Village house, Ching Yuen |
70 |
81 |
|
N18 |
Village house, Lin Yuen, 78 Leung Uk Tsuen |
70 |
76 |
|
N19 |
Village house, 107 Wang Toi Shan Hung Mo Tam |
70 |
71 |
|
N20 |
Village house, Block 25, Green Villa |
70 |
75 |
|
N21 |
Village house, Lee Ka Yuen, 27 Wang Toi Shan San Tsuen |
70 |
78 |
|
N22 |
Village house, 28C Wang Toi Shan San Tsuen |
70 |
77 |
|
N23 |
Village house, 27 Wang Toi Shan Yau Uk Tsuen |
70 |
73 |
|
N24 |
Village house, Lodgewood, 72 Wang Toi Shan San Tsuen |
70 |
78 |
|
N25 |
Village house, 50F Wang Toi Shan Yau Uk Tsuen |
70 |
78 |
|
N26 |
Yan Wo Home for Aged |
70 |
77 |
|
N27 |
Village house, 94B Wang Toi Shan Lo Uk Tsuen |
70 |
72 |
|
N28 |
Village house, 46 – 47 Wang Toi Shan Lo Uk Tsuen |
70 |
77 |
|
N29 |
On Fuk Home for Aged |
70 |
74 |
|
N30 |
Village house, 30
Wang Toi Shan Lo Uk Tsuen |
70 |
77 |
|
N31 |
Block 9, Evergreen International Hong Kong Association |
70 |
75 |
|
N32 |
Village house, 1
Wang Toi Shan Lo Uk Tsuen |
70 |
76 |
|
N33 |
Village house, Fau
Wan Court |
70 |
75 |
|
N34 |
Village house near Pine Hill Villa |
70 |
75 |
|
N35 |
Village house, 410 Kam Tin Road |
70 |
74 |
|
N36 |
Village house, Pine Hill Villa |
70 |
75 |
|
N37 |
Village house, 23D Sheung Tsuen |
70 |
75 |
|
N38 |
Village house, Hang Yuen, 25B Sheung Tsuen |
70 |
74 |
|
N39 |
Village house, 7A Sheung Tsuen |
70 |
82 |
|
N40 |
Village house, Yiu Court, 6 Sheung Tsuen |
70 |
78 |
|
N41 |
Village house, 14A Sheung Tsuen |
70 |
79 |
|
N42 |
Village house, 6A Sheung Tsuen |
70 |
77 |
|
N43 |
Village house next to Pat Heung Sheung Tsuen Village Office |
70 |
76 |
|
N44 |
Village house, 4
Sheung Tsuen |
70 |
76 |
|
N45 |
Village house, 3
Sheung Tsuen |
70 |
75 |
|
N46 |
Village house, 9B
Sheung Tsuen |
70 |
75 |
|
N47 |
Cheung Chau Court |
70 |
69 |
|
N48 |
4 Shropshire Road |
70 |
67 |
|
N49 |
Village house, 3A Wong Chuk Yuen |
70 |
66 |
|
N50 |
Village house of Wong Chuk Yuen |
70 |
68 |
|
N51 |
Village house next to Tai Hing Farm |
70 |
70 |
|
N52 |
Village house of Wong Chuk Yuen |
70 |
69 |
|
N53 |
Village house, 151 Wong Chuk Yuen |
70 |
68 |
|
N54 |
Village house |
70 |
72 |
|
N55 |
Village house, 70 Lam Kam Road |
70 |
75 |
|
N56 |
Lam Tsuen Country Park |
N/A(1) |
N/A(1) |
|
N57 |
Village house, opposite side of Kadoorie Experimental Farm |
70 |
74 |
|
P01 |
Planned Village
Type Development [V Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
70 |
80 |
|
P02 |
Village house of Wing Lung Wai (under construction) |
70 |
75 |
|
P03 |
Planned Residential
Development [R(D) Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
70 |
79 |
|
P04 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
70 |
80 |
|
P05 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
70 |
82 |
|
P06 |
Planned Residential
Development (R(D) Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
70 |
82 |
|
P07 |
Planned Residential
Development (R(C)2 Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
70 |
77 |
|
P08 |
Village house near RCP opposite to bus stop (under construction) |
70 |
80 |
|
P09 |
Planned Village
Type Development (V Zone) at Pat Heung OZP [Statutory Plan No.: S/YL-PH/11] |
70 |
82 |
|
P10 |
Planned village
house [Planning Application Case No.: A/YL-PH/798] |
70 |
80 |
|
P11 |
Planned Residential
Development (R(D) Zone) at Pat Heung OZP
[Statutory Plan No.: S/YL-PH/11] |
70 |
82 |
|
P12 |
Planned residential
development [Planning Application Case No.: A/YL-PH/736] |
70 |
79 |
|
P13 |
Planned Village Type Development (V Zone) at Shek Kong OZP [Statutory
Plan No.: S/YL-SK/9] |
70 |
82 |
|
P14 |
Planned Village Type Development (V Zone) at Shek Kong OZP [Statutory
Plan No.: S/YL-SK/9] |
70 |
82 |
Note: Noise levels exceeding the road traffic
noise criteria are bolded and underlined.
(1)
N/A – Not Applicable. In accordance with Annex 13 of the EIAO-TM,
country parks are considered to be a NSR. However, there is no camping site
located at Lam Tsuen Country Park within 300m assessment area. As such, in view
of the transient nature of visitors to the Country Park, any potential
construction and operation noise impacts on the visitors would not be
considered insurmountable and no adverse noise impact on Lam Tsuen Country Park
which are within 300m assessment area is anticipated. Hence, it was not
identified as a noise assessment point in the assessments.
In the absence of noise
mitigation measures, it is found that the predicted road traffic noise levels
at most of the representative NSRs exceed the noise criteria. The total number of dwellings and other NSRs that will be exposed
to road traffic noise exceeding the noise criteria set out in Annex 5 of the
EIAO-TM has been estimated and summarized in Table 4.10.
Table
4.10 Number of Dwellings
with Noise Exceedance (Unmitigated Scenario)
|
Scenario |
Description |
No. of Existing Residential Dwellings |
No. of Other Existing NSRs (Place for Worship) |
No. of Planned Dwellings |
No. of Other Planned NSRs |
|
With Project (Unmitigated) |
Affected Dwellings |
647 |
1 |
61 |
Nil |
|
Without Project |
647 |
1 |
61 |
Nil |
According to Annex 13 of the EIAO-TM, where the predicted
noise impacts exceed the applicable noise criteria, direct mitigation measures,
such as alternative land use arrangement, alternative
siting, alternative alignment and screening by noise tolerant buildings
etc., shall be considered and evaluated in an appropriate manner. However, as
mentioned in Section 2 above, the Project only consists of road widening and
improvement works and is not arising from change of road alignment. Alternative
alignment is not practicable. Meanwhile, the Project will not include new land
use planning or development. The implementation of direct noise mitigation
should not create any disturbance to the existing buildings nearby. Alternative
land use arrangement and orientation of buildings are not practicable.
Therefore, direct noise mitigation measures of LNRS and
roadside noise barrier are applicable to the Project. The implementation of Low Noise Road Surfacing (LNRS)
and noise barrier have been reviewed and considered at the road sections nearby
NSRs in the situations where the predicted road traffic noise
level exceeds the criteria in Table 1A of Annex 5 of the EIAO-TM
As mentioned in section 4.6.3,
technical constraints of the application of LNRS such as vertical gradient,
frequent sharp turning/braking, roadside parking, distance between
junction/signalized crossing/zebra crossing and jointing on concrete pavement
have been taken into consideration when proposing LNRS to be applied to the
road sections. The road sections of
proposed LNRS are shown in Figure 4.5. The details of proposed LNRS are
summarised in Table 4.11a below.
Table 4.11a Extents and Locations of Proposed
Low Noise Road Surfacing
|
LNRS
Chainage |
Approximate
Length, m |
Figure
Reference |
|
CHA 0+65.00 to CHA 3+00.00 (both lane) |
235 |
|
|
CHA 4+40.00 to CHA 6+35.00 (both lane) |
195 |
|
|
CHA 6+35.00 to CHA 7+20.00 (westbound single lane) |
85 |
|
|
CHA 10+80.00 to CHA 12+00.00 (both lane) |
120 |
|
|
CHA 15+50.00 to CHA 16+10.00 (westbound single lane) |
60 |
|
|
CHA 16+10.00 to CHA 18+80.00 (both lane) |
270 |
|
|
CHA 19+05.00 to CHA 20+15.00 (both lane) |
110 |
|
|
CHA 20+15.00 to CHA 21+45.00 (westbound single lane) |
130 |
|
|
CHA 22+05.00 to CHA 23+60.00 (both lane) |
155 |
|
|
CHB 24+80.00 to CHB 26+70.00 (both lane) |
190 |
|
|
CHA 30+55.00 to CHA 32+20.00 (both lane) |
165 |
|
|
CHA 33+55.00 to CHA 34+25.00 (both lane) |
70 |
|
|
CHB 35+20.00 to CHB 36+50.00 (both lane) |
130 |
|
|
CHB 36+50.00 to CHB 37+50.00 (southbound single lane) |
100 |
|
|
CHA 37+50.00 to CHA 38+00.00 (both lane) |
50 |
Most
of buildings and structures in Kam Tin area such as the single-storey temporary
steel workshop and 3-storey village house are found on footing which is
sensitive to the ground subsidence. Also, some aged drainage pipes and water
mains are laid along Kam Tin Road. During the deep excavation such as piling
works, a considerable ground settlement and differential settlement would be
expected in the adjacent area. The adverse effect will be imposed on the
existing buildings and underground utilities.
In
view of the above, piled foundation would not be recommended for the proposed
noise barriers along Kam Tin Road and Lam Kam Road due to the increased
construction difficulties and adverse impact to the surroundings. The adoption
of footing for the proposed noise barriers will be an effective and safe option
for the above site condition.
After
reviewing the existing site constraints including the traffic flow, impact of
the temporary traffic arrangement and workable space during construction stage,
an approximate 3.0m wide inverted L-shape substructure with footing will be
proposed for the noise barriers. Owing to the limited sliding, overturning and
bearing capacity of such structural geometry, the height of noise barrier shall
be limited to maximum 5.0m in Kam Tin Road in order to maintain the overall
structural integrity and stability of the substructure.
However,
the sloping ground profile is identified along the edge of Lam Kam Road, the
proposed substructure for the noise barriers shall be found on the edge of Lam
Kam Road as appropriate. To maintain the overall stability of the existing
slopes, the bearing pressure of the substructure should be limited to achieve
an acceptable safety margin against failure for the existing slopes, thus, the
maximum height of the noise barriers along Lam Kam Road should further reduced
to 3.0m high. The above proposed general arrangement for the noise barriers
shall be examined in the design stage to review the suitability of preliminary
design in view of changing site conditions.
The above constraints limiting the maximum height of the
proposed noise barriers have been confirmed by the Project Engineer.
Constraints of applying noise barrier for the NSRs are
listed below and summarized in Appendix 4.12.
·
no blockage on access
(engineering constraints as given in cl.4.7.11 of EIAO Guidance Note No.
12/2010)
·
effective height to
length ratio should be maintained at 1:5 (acoustic effectiveness as given in cl.4.7.11
of EIAO Guidance Note No. 12/2010)
·
obstruct emergency
access or firefighting (fire safety consideration as given in cl.4.7.11 of EIAO
Guidance
Note No. 12/2010)
·
undermine road safety
or impede pedestrian and vehicular movements (sightline & road safety
considerations
as given in cl.4.7.11 of EIAO Guidance Note No. 12/2010)
·
interfere with
commercial activities or cause social disruptions / resident objection (public
objections
as given in cl.4.7.11 of EIAO Guidance Note No. 12/2010)
·
engineering
constraint e.g. affecting existing buildings/structures (engineering
constraints as given
in
cl.4.7.11 of EIAO Guidance Note No. 12/2010)
·
impossibility of land
resumption for constructing noise barriers (public objections as given in cl.4.7.11
of EIAO Guidance Note No. 12/2010)
After consideration of the potential road traffic noise
impacts and constraints on erecting the roadside noise barrier, a total length
of approximate 837m vertical noise barriers is recommended with reference to
the criteria under the “Guidelines on Design of Noise Barriers” jointly
published by the Environmental Protection Department and the Highways Department.
Absorptive noise barriers will be adopted where there
are existing or planned NSRs on the opposite side of the road sections to
minimise the noise impact on these receivers due to reflection by the noise
barriers. Reflective noise barriers will be adopted where there is no existing
or planned NSRs on the opposite side of the road sections to minimise the
potential visual impact due to obstruction of views by the opaque
absorptive noise panels.
Locations of proposed noise barriers are shown in Figure 4.5. The details of proposed noise barriers are summarised in Table 4.11b below.
Table 4.11b Extents and Locations of Proposed
Noise Barriers
|
Noise
Barrier ID |
Barrier
Type |
Height,
m |
Approximate
Length, m |
Figure
Reference |
|
NB1 |
Vertical (reflective) |
4 |
60 |
|
|
NB2 |
Vertical (reflective) |
5 |
35 |
|
|
NB12 |
Vertical (reflective) |
5 |
25 |
|
|
NB17 |
Vertical (reflective) |
5 |
30 |
|
|
NB18 |
Vertical (reflective) |
5 |
45 |
|
|
NB19 |
Vertical (reflective) |
5 |
140 |
|
|
NB37 |
Vertical (reflective) |
5 |
25 |
|
|
NB39 |
Vertical (reflective) |
5 |
32 |
|
|
NB52 |
Vertical (absorptive) |
5 |
40 |
|
|
NB54 |
Vertical (absorptive) |
5 |
38 |
|
|
NB55 |
Vertical (absorptive) |
5 |
52 |
|
|
NB56 |
Vertical (absorptive) |
5 |
35 |
|
|
NB72 |
Vertical (absorptive) |
5 |
30 |
|
|
NB92 |
Vertical (reflective) |
5 |
132 |
|
|
NB94 |
Vertical (reflective) |
5 |
25 |
|
|
NB114 |
Vertical (absorptive) |
3 |
40 |
|
|
NB116 |
Vertical (absorptive) |
3 |
53 |
Mitigated Scenario
Mitigated scenario refers to the situation where LNRS and
vertical noise barriers are implemented at applicable locations with the
Project in Year 2040. After implementation of mitigation measures, the
predicted road traffic noise levels at the representative NSRs under the
mitigated scenario are
summarized in Table 4.12 and detailed calculations are provided in Appendix 4.13.
Table
4.12 Predicted Maximum Traffic Noise
Levels at the Representative NSRs (Mitigated
Scenario)
|
NAP ID |
NSR Descriptions |
Noise
Criteria, dB(A) |
Predicted
Maximum Noise Levels (L10(1 hour)), dB(A) |
|
N01 |
Kam Kwong Nepali Christian Church |
65 |
74 |
|
N02 |
Village house, 37 Kiu Tau Tsuen |
70 |
64 |
|
N03 |
Village house, Evergreen Garden |
70 |
68 |
|
N04 |
Low-rise residential building, Block 7, Season Monarch |
70 |
69 |
|
N05 |
Village house, Pang Ka Tsuen |
70 |
74 |
|
N06 |
Village house, 18E Shek Kong San Tsuen |
70 |
79 |
|
N07 |
Dormitory of Shek Kong Barrack |
70 |
77 |
|
N08 |
Village house of Shek Kong San Tsuen |
70 |
72 |
|
N09a |
Village house of Shek Kong San Tsuen |
70 |
72 |
|
N09b |
Village house, 2A -2B Shek Kong San Tsuen |
70 |
72 |
|
N10 |
Low-rise residential building, 136 Seasons Villa |
70 |
69 |
|
N11 |
Village house near Seasons Villa |
70 |
78 |
|
N12 |
Village house near Seasons Villa |
70 |
71 |
|
N13 |
Village house, 265 Kam Tin Road |
70 |
72 |
|
N14 |
Village house next to Shek Kong Vegetable Marketing Cooperation
Society Limited |
70 |
76 |
|
N15 |
Village house near Shek Kong Vegetable Station |
70 |
79 |
|
N16 |
Village house, Chung Ying Yuen, Wang Toi Shan Tsoi Yuen Tsuen (North) |
70 |
74 |
|
N17 |
Village house, Ching Yuen |
70 |
79 |
|
N18 |
Village house, Lin Yuen, 78 Leung Uk Tsuen |
70 |
74 |
|
N19 |
Village house, 107 Wang Toi Shan Hung Mo Tam |
70 |
71 |
|
N20 |
Village house, Block 25, Green Villa |
70 |
72 |
|
N21 |
Village house, Lee Ka Yuen, 27 Wang Toi Shan San Tsuen |
70 |
75 |
|
N22 |
Village house, 28C Wang Toi Shan San Tsuen |
70 |
76 |
|
N23 |
Village house, 27 Wang Toi Shan Yau Uk Tsuen |
70 |
71 |
|
N24 |
Village house, Lodgewood, 72 Wang Toi Shan San Tsuen |
70 |
76 |
|
N25 |
Village house, 50F Wang Toi Shan Yau Uk Tsuen |
70 |
76 |
|
N26 |
Yan Wo Home for Aged |
70 |
74 |
|
N27 |
Village house, 94B Wang Toi Shan Lo Uk Tsuen |
70 |
70 |
|
N28 |
Village house, 46 – 47 Wang Toi Shan Lo Uk Tsuen |
70 |
75 |
|
N29 |
On Fuk Home for Aged |
70 |
71 |
|
N30 |
Village house, 30
Wang Toi Shan Lo Uk Tsuen |
70 |
71 |
|
N31 |
Block 9, Evergreen
International Hong Kong Association |
70 |
70 |
|
N32 |
Village house, 1 Wang Toi Shan Lo Uk Tsuen |
70 |
76 |
|
N33 |
Village house, Fau Wan Court |
70 |
73 |
|
N34 |
Village house near Pine Hill Villa |
70 |
72 |
|
N35 |
Village house, 410 Kam Tin Road |
70 |
73 |
|
N36 |
Village house, Pine Hill Villa |
70 |
72 |
|
N37 |
Village house, 23D Sheung Tsuen |
70 |
74 |
|
N38 |
Village house, Hang Yuen, 25B Sheung Tsuen |
70 |
71 |
|
N39 |
Village house, 7A Sheung Tsuen |
70 |
80 |
|
N40 |
Village house, Yiu Court, 6 Sheung Tsuen |
70 |
77 |
|
N41 |
Village house, 14A Sheung Tsuen |
70 |
77 |
|
N42 |
Village house, 6A
Sheung Tsuen |
70 |
76 |
|
N43 |
Village house next
to Pat Heung Sheung Tsuen Village Office |
70 |
76 |
|
N44 |
Village house, 4
Sheung Tsuen |
70 |
67 |
|
N45 |
Village house, 3 Sheung Tsuen |
70 |
66 |
|
N46 |
Village house, 9B Sheung Tsuen |
70 |
74 |
|
N47 |
Cheung Chau Court |
70 |
69 |
|
N48 |
4 Shropshire Road |
70 |
67 |
|
N49 |
Village house, 3A Wong Chuk Yuen |
70 |
66 |
|
N50 |
Village house of Wong Chuk Yuen |
70 |
68 |
|
N51 |
Village house next to Tai Hing Farm |
70 |
70 |
|
N52 |
Village house of Wong Chuk Yuen |
70 |
69 |
|
N53 |
Village house, 151 Wong Chuk Yuen |
70 |
68 |
|
N54 |
Village house |
70 |
70 |
|
N55 |
Village house, 70 Lam Kam Road |
70 |
70 |
|
N56 |
Lam Tsuen Country Park |
N/A(1) |
N/A(1) |
|
N57 |
Village house,
opposite side of Kadoorie Experimental Farm |
70 |
74 |
|
P01 |
Planned Village
Type Development [V Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
70 |
80 |
|
P02 |
Village house of Wing Lung Wai (under
construction) |
70 |
75 |
|
P03 |
Planned Residential
Development [R(D) Zone] at Kam Tin South
OZP [Statutory Plan No.: S/YL-KTS/15] |
70 |
79 |
|
P04 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
70 |
80 |
|
P05 |
Planned Village
Type Development (V Zone) at Kam Tin North OZP
[Statutory Plan No.: S/YL-KTN/9] |
70 |
80 |
|
P06 |
Planned Residential
Development (R(D) Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
70 |
80 |
|
P07 |
Planned Residential
Development (R(C)2 Zone) at Kam Tin North
OZP [Statutory Plan No.: S/YL-KTN/9] |
70 |
76 |
|
P08 |
Village house near RCP opposite to bus stop (under
construction) |
70 |
80 |
|
P09 |
Planned Village
Type Development (V Zone) at Pat Heung OZP [Statutory Plan No.: S/YL-PH/11] |
70 |
80 |
|
P10 |
Planned village
house [Planning Application Case No.:
A/YL-PH/798] |
70 |
80 |
|
P11 |
Planned Residential
Development (R(D) Zone) at Pat Heung OZP
[Statutory Plan No.: S/YL-PH/11] |
70 |
82 |
|
P12 |
Planned residential
development [Planning Application Case No.:
A/YL-PH/736] |
70 |
78 |
|
P13 |
Planned Village
Type Development (V Zone) at Shek Kong OZP [Statutory Plan No.: S/YL-SK/9] |
70 |
80 |
|
P14 |
Planned Village
Type Development (V Zone) at Shek Kong OZP [Statutory Plan No.: S/YL-SK/9] |
70 |
77 |
Note: Noise
levels exceeding the road traffic noise standards are bolded
and underlined.
(1)
N/A – Not Applicable. In accordance with Annex 13 of the EIAO-TM,
country parks are considered to be a NSR. However, there is no camping site located
at Lam Tsuen Country Park within 300m assessment area. As such, in view of the
transient nature of visitors to the Country Park, any potential construction and
operation noise impacts on the visitors would not be considered insurmountable
and no adverse noise impact on Lam Tsuen Country Park which are within 300m
assessment area is anticipated. Hence, it was not identified as a noise
assessment point in the assessments.
With implementation of the proposed direct noise mitigation
measures, the total number of dwellings and other NSRs that will be benefited
and protected has been estimated and summarized in Table 4.13.
Table
4.13 Number of Dwellings
Benefited and Protected (Mitigated Scenarios)
|
Scenario with Different Mitigation Measures (with Project) |
Description |
No. of Existing Residential Dwellings |
No. of Other Existing NSRs (Place for Worship) |
No. of Planned Dwellings |
No. of Other Planned NSRs |
|
LNRS only |
Benefited |
463 |
0 |
27 |
Nil |
|
Protected |
32 |
0 |
0 |
Nil |
|
|
Noise Barrier only |
Benefited |
226 |
0 |
3 |
Nil |
|
Protected |
64 |
0 |
0 |
Nil |
|
|
LNRS and Noise Barrier |
Benefited |
565 |
0 |
30 |
Nil |
|
Protected |
106 |
0 |
0 |
Nil |
Notes:
(1) Dwellings benefited from noise
mitigation measures are those exposed to overall road traffic noise exceeding
noise criteria stipulated in the EIAO-TM under unmitigated scenario (with
Project) and are benefited from noise reduction of at least 1.0 dB(A) with the
implementation of the noise mitigation measures.
(2) Dwellings protected by noise
mitigation measures are those exposed to overall road traffic noise exceeding
noise criteria stipulated in the EIAO-TM under the unmitigated scenario (with
Project) and exposed to overall road traffic noise complying with the noise criteria
stipulated in the EIAO-TM with the implementation of the noise mitigation
measures.
After implementing the proposed
LNRS and noise barriers, the predicted overall noise levels of some of the NSRs
still exceed the noise criteria as shown in the above Table 4.12. Despite
of the constraints of the implementation of direction noise mitigation
measures, LNRS and noise barriers have been proposed to be implemented as far as practicable.
It should be worth to note that even without the Project,
there will still be 647 existing residential dwellings and 1 existing place of
worship to be affected by the existing Kam Tin Road due to the fact that the
Project only involves road improvement works with certain extent of road
traffic lane widening but without addition of traffic lanes, changing of any
future traffic volume, composition and speed. The increase of road traffic noise levels
from the Project are mainly due to the widening of the existing road traffic
lane which moves the road traffic noise source closer to the existing
NSRs. The increase in road traffic
noise level due to the Project is considered not significant (less than
1.0dB(A) increase in all NSRs) after implementation of noise mitigation
measures when comparing to the without Project scenario as shown in Appendix 4.15. In fact, the
mitigated road traffic noise levels with the Project at many NSRs are less than
that of the without project scenario.
With the proposed direct mitigation measures, there will be 565 existing
dwellings and 30 planned dwellings benefited, and 106 existing dwellings
protected. On the other hand, 605
existing dwellings will be benefited under mitigated scenario with Project as compared
to the without Project scenario. The predicted noise levels in Year 2040
without Project is shown in Appendix 4.15.
The total number of dwellings
that will still be exposed to road traffic noise exceeding the noise criteria
set out in Annex 5 of the EIAO-TM has been estimated
and summarized in Table 4.14.
Table
4.14 Number of
Dwellings with Noise Exceedance (Mitigated Scenarios)
|
Scenario with Different Mitigation Measures (with Project) |
No. of Existing Residential Dwellings |
No. of Other Existing NSRs (Place for Worship) |
No. of Planned Dwellings |
No. of Other Planned NSRs |
|
LNRS only |
615 |
1 |
61 |
Nil |
|
Noise Barrier only |
583 |
1 |
61 |
Nil |
|
LNRS and Noise Barrier |
541 |
1 |
61 |
Nil |
After the exhaustion of the
above at-source mitigation measures, the predicted overall noise
levels of the planned NSRs still exceed the noise criteria. At-receiver
mitigation measures, such as alternative building orientation, building setback, special building design, boundary wall
noise barriers and provision of architectural
fins/acoustic windows/balconies, are proposed to alleviate the
road traffic noise impacts on the planned NSRs.
Alternative noise mitigation measures, for example, by
means of alternative building orientation, setback and layout
design of individual developments, could be explored at the detailed design
stage of future developments. The orientation and disposition of the buildings
could be adjusted not facing Kam Tin Road and Lam Kam Road directly and could
be located away from the roads to minimize the road traffic noise impact as far
as practicable. Boundary
wall of the residential developments, if any, could be designed as noise
barrier to screen the propagation of road traffic noise source. Provision of architectural fins/acoustic
windows/balconies for any planned public and private housings are subject to
further study by the future public and private developers respectively. Future developers
can further explore alternative options which can achieve corresponding road traffic
noise reduction during the detailed design stage.
Future landowners of the planned NSRs should also consider
alternative land use arrangement and alternative site in future development
planning, such as, using the site for development which does not rely on
openable window for ventilation. During design of the master layout
plan, the use of any noise tolerant buildings as screening structures to
alleviate the potential road traffic noise impact in future development should be
explored.
As per the Outline Zoning Plan, all land uses of the
planned NSRs are Residential (Group D) and Village Type Development. The
maximum building height for residential buildings (Group D) and village houses
is about 2 to 3 storeys (6 to 8.23m). Therefore, the opportunity of building
using extended podium is considered not practicable. Decking over the roads, i.e. Kam Tin
Road, would substantially deteriorate the existing landscape and visual
environment and quality. As such,
decking over Kam Tin Road as noise mitigation measure is not a preferable
option.
However, noise impact assessment at the planned residential
sites is proposed to be conducted by future developers at the detailed design
stage to study whether the future development layout would avoid exposing to
excessive road traffic noise levels so as to minimise the scale and extent of
the proposed noise mitigation measures such as special building design and architectural
fins/acoustic windows/balconies. The requirement of noise impact assessment
should be included in the land lease condition or planning briefs of the
residential sites.
After implementing the proposed LNRS and noise barriers,
the predicted overall noise levels of some of the NSRs still exceed the noise
criteria as shown in the above Table 4.12. Based on the criteria as stated in Section 4.6.4 above,
the eligibility test for indirect noise mitigation measure is conducted.
Details of the eligibility test are given in Appendix
4.14. As no representative existing NSRs would fall within all
the three testing criteria mentioned in Section 4.6.4, it is considered that no
indirect mitigation measures would be required.
Under unmitigated scenario, 647 existing residential dwellings and 1 existing place of worship as shown in Table
4.10 will have exceedances
of noise criteria ranging from 1 to 12 dB(A).
With the proposed noise mitigation measures in place, such
as noise barriers and LNRS on some road sections of Kam Tin Road and Lam Kam
Road, the predicted noise levels at some of the assessment points would still exceed
the relevant road traffic noise criteria. Despite of the constraints of the implementation of
direction noise mitigation measures, LNRS and noise barriers have been proposed
to be implemented as far as practicable. After implementing direct noise
mitigation measures, the predicted overall noise levels of some of the NSRs as
shown in Table 4.14 still exceed the noise criteria, which are not directly
affected by the Project.
Nevertheless,
with the proposed direct mitigation measures, there will be 565 existing
dwellings and 30 planned dwellings benefited, and 106 existing dwellings
protected. As no representative
existing and planned NSRs would fall within all the three testing criteria
mentioned in Section 4.6.4, no indirect mitigation measures would be required.
It
should be worth to note that even without the Project, there will still be 647
existing dwellings to be affected by the existing Kam Tin Road due to the fact
that the Project only involves road improvement works with certain extent of road
traffic lane widening but without addition of traffic lanes, changing of any
future traffic volume, composition and speed. The increase of road traffic noise levels
from the Project are mainly due to the widening of the existing road traffic
lane which moves the road traffic noise source closer to the existing NSRs. The increase in road traffic noise level
due to the Project is considered not significant (less than 1.0dB(A) increase
in all NSRs) after implementation of noise mitigation measures when comparing
to the without Project scenario. In
fact, the mitigated road traffic noise levels with the Project at many NSRs are
less than that of the without project scenario.
The
residual road traffic noise impact of the Project is considered acceptable.
Since it is anticipated that there will be potential
adverse impacts during construction, construction phase EM&A shall be
conducted to ensure the recommended mitigation measures are effectively
implemented.
Road traffic noise monitoring should be carried out during
the first year of the operation phase at representative NSRs located in the
vicinity of the recommended direct mitigation measures. Details of the
programme shall be provided in the EM&A Manual.
Practical noise mitigation measures such as use of quieter
PMEs and erection of temporary noise barrier, enclosure and/or noise insulation
fabric and alternative
quieter construction methods are proposed to minimize the noise impact during
the construction phase. It is recommended that more detailed construction
work programme should be established by the Contractor and appropriate noise
mitigation measures should be implemented taking into account the actual site
condition and constraints, in order to minimize the residual construction noise
impact. EM&A has been proposed to ensure the implementation and
effectiveness of the mitigation measures.
Direct noise mitigation measures such as LNRS
and noise barriers are evaluated to minimize the operation noise impact. LNRS
with total length of approximate 2.1km would be
applied on several road sections of Kam Tin Road. A total length of approximate
837m vertical noise barriers with maximum height of 5.0m along Kam Tin Road
and maximum height of 3.0m along Lam Kam Road are recommended for the NSRs with
exceedance in unmitigated scenario. After implementing direct noise mitigation
measures, the predicted overall noise levels of some of the NSRs still exceed
the noise criteria, which are not directly affected by the Project. Nevertheless, with the proposed direct
mitigation measures, there will be 565 existing dwellings and 30 planned
dwellings benefited, and 106 existing dwellings protected. As no representative existing NSRs would
fall within all the three testing criteria mentioned in Section 4.6.4, no
indirect mitigation measures would be required.
The increase in road traffic noise level due to the Project
is considered not significant (less than 1.0dB(A) increase in all NSRs) after
implementation of noise mitigation measures when comparing to the without
Project scenario. In fact, the
mitigated road traffic noise levels with the Project at many NSRs are less than
that of the without project scenario.
Therefore, the residual road traffic noise
impact of the Project is considered acceptable.
[1] Project Profile of Development of Organic
Resources Recovery Centre (Phase 3) (No. PP-552/2017)
[2] Preliminary Environmental Review Report
(Final) for Agreement No. CE 34/2014 (CE) Site Formation and Infrastructural
Works for the Initial Sites at Kam Tin South, Yuen Long – Investigation, Design
and Construction\
[3] Report on Preliminary Environmental Review
(Final) for Agreement No. CE 61/2012 (HY) Improvement to Fan Kam Road –
Investigation