5.1.1. This section presents a noise impact assessment, which identifies potential sources of noise impact, assesses the potential impacts and recommends mitigation measures where required to reduce the noise impacts to acceptable levels, for the construction and operation of the proposed Project.
5.2.1. The Noise Control Ordinance, Cap 400 (NCO) and the Environmental Impact Assessment Ordinance (EIAO) (Cap 499) provide the statutory framework for noise control. Assessment procedures and standards relevant to the proposed Project are set out in the Technical Memoranda (TM) given below:
¡P TM on Environmental Impact Assessment Process (EIAO-TM);
¡P TM on Noise from Construction Work other than Percussive Piling (GW-TM);
¡P TM on Noise from Construction Work in Designated Areas (DA-TM); and
¡P TM for the Assessment of Noise from Places Other Than Domestic Premises, Public Places or Construction Sites (IND-TM).
5.2.2. The carrying out of percussive piling is prohibited between 1900 and 0700 hours or at any time on a general holiday (including Sunday). A valid construction noise permit (CNP) is required for the carrying out of percussive piling during the permitted hours.
General
Construction Activities during Non-Restricted Hours
5.2.3.
Noise impacts arising from
general construction activities other than percussive piling between 0700 and
1900 hours on any day not being a Sunday or general holiday are assessed
against the standards set out in the EIAO-TM. The noise standards are
summarised in Table 5.1
below.
Table 5.1 Noise Standards for Daytime Construction Activities
Use |
Noise Standards, Leq(30mins)
dB(A) |
Domestic premises,
hotels and hostels |
75 |
Education
institutions, kindergartens, nurseries and all others where voice
communication is required |
70 65 (during examination period) |
Note: The above standards apply to noise sensitive uses which rely on opened window for ventilation.
5.2.4. According to the construction programme shown in Appendix 3.1, all the proposed construction works will be carried out during non-restricted hours.
5.2.5. The NCO and IND-TM control noise from fixed noise sources from places or premises other than domestic premises, public places or construction sites. For the assessment of impacts from fixed noise sources, the Area Sensitive Rating (ASR) of the noise sensitive receivers (NSRs) must be determined in accordance with the IND-TM. Similar to the GW-TM and DA-TM, the appropriate Acceptable Noise Level (ANL) can be determined based on the ASR. There are 4 types of area described in the IND-TM which are summarised in Table 5.2 below.
Table 5.2 Area Sensitivity Ratings of NSRs
Type of
Area Containing NSR |
Degree to which
NSR is affected by Influencing Factors (IFs) |
||
Not Affected |
Indirectly
Affected |
Directly Affected |
|
I.
Rural area, including country parks, or
village type developments |
A |
B |
B |
II.
Low density residential area consisting of
low-rise or isolated high-rise developments |
A |
B |
C |
III. Urban
area |
B |
C |
C |
IV. Area
other than those above |
B |
B |
C |
5.2.6. The ANLs based upon the different ASRs are shown in Table 5.3 below.
Table 5.3 ANLs for Fixed Plant Noise
Time Period |
ANL, dB(A) |
||
ASR ¡¥A¡¦ |
ASR ¡¦B¡¦ |
ASR ¡¥C¡¦ |
|
Day and evening (0700-2300 hrs) |
60 |
65 |
70 |
Night (2300-0700 hrs) |
50 |
55 |
60 |
5.2.7. More stringent criteria for assessing fixed plant noise are specified in the EIAO-TM for planning purposes. The assessment criteria are:
¡P 5dB(A) below the appropriate ANL set out in the IND-TM (as shown in Table 5.3 above); or
¡P The prevailing background noise level, whichever is the lower.
Road
Traffic Noise
5.2.8. The EIAO-TM defines road traffic noise standards for planning purposes. The relevant criteria are shown in Table 5.4 below.
Table 5.4 Road Traffic Noise Standards for Planning Purposes
Use |
Road Traffic Noise Peak Hour Traffic, L10(1 hour)
dB(A) |
Domestic premises |
70 |
Hotel and hostels |
70 |
Offices |
70 |
Education institutions |
65 |
Places of public worship and courts of law |
65 |
Hospital & clinics, convalescences and homes
for the aged, diagnostic rooms, wards |
55 |
Note: The above standards apply to noise sensitive uses which rely on opened window for ventilation.
5.3.1. Representative NSRs were identified in accordance with Annexes 5 and 13 of the EIAO-TM and should include all domestic premises, temporary housing accommodation, educational institutions including kindergartens, nurseries, and all others where unaided voice communication is required, hospitals, medical clinics, homes for the aged, convalescent homes, places of public worship, libraries, courts of law, performing arts centres, auditoria, amphitheatres, hostels and country parks that have direct line-of-sight and substantial angle of view of the Project area. Study area is expanded beyond 300m from the Project site to include NSRs at Tsui Wan Estate.
5.3.2. The existing NSRs were identified with reference to the latest best available information at the time of preparation of this report, such as those showing on the survey maps, topographic maps, aerial photos and other relevant land use plans. Site surveys were conducted on 20 May 2014 to verify the sensitive receivers and confirm the desktop studies.
5.3.3. Planned NSR was identified with reference to the latest best available information at the time of preparation of this report. Confirmations have been obtained from various government departments in May 2014 on the planned developments. A planned THEi New Campus was identified as the only planned NSR of the proposed Project.
5.3.4. Figure 5.1 shows the Project boundary, representative NSRs and noise assessment points (NAPs). Details of the representative existing and planned NSRs with the corresponding NAPs are summarised in Table 5.5. Photos of the representative existing NSRs are shown in Appendix 5.1.
Table 5.5 Representative Existing and Planned NSRs with the Corresponding NAPs
NSR
ID |
NAP
ID |
Name
of Building |
Use
[1] |
Potential
Impact [2] |
No.
of Storeys |
Approx.
Distance from the Site (m) |
Shielded/
No Direct Line-of- Sight |
NSR
1 |
NAP 101 |
Heng
Fa Chuen Block 50 |
R |
C, R, F |
21 |
300 |
Nil |
NSR
2 |
NAP 201 |
Hong
Kong Institute of Vocational Education (Chai Wan) - Academic Block |
E |
C, R, F |
6 |
145 |
Nil |
NAP 202 |
R |
248 |
1/F ¡V 6/F |
||||
NSR
3 |
NAP 301 |
Knight
Court Flat C & D [4] |
R |
R |
24 |
160 |
1F ¡V 24/F |
NSR
4 |
NAP 401 |
Tsui
Shou House, Tsui Wan Estate |
R |
C, R, F |
30 |
345 |
Nil |
NSR
5 |
NAP 501 |
Endeavourers
Chan Cheng Kit Wan Kindergarten |
E |
C, R, F |
1 |
340 |
Nil |
NSR
6 |
NAP 601 |
Tsui
Fuk House, Tsui Wan Estate |
R |
C, R, F |
30 |
375 |
Nil |
NSR
7 |
NAP 701 |
Tsui
Hong House, Tsui Wan Estate |
R |
C, R, F |
30 |
380 |
1/F ¡V 6/F |
NSR
8 [3] |
NAP 801 |
Planned
THEi New Campus |
E |
C, F |
14 |
200 |
Nil |
NAP 802 |
E |
R |
14 |
260 |
5/F- 13/F |
Notes:
[1]
R- Residential, E- Educational
[2]
C- Construction air-borne noise, R- Operational road traffic noise, F-
Operational fixed plant noise
[3] The classrooms will be located from 5/F to
13/F at NSR 8.
[4] The eastern façade of Knight Court are
provided with windows with special key lock for cleansing purpose only (i.e.
not relying on such windows for ventilation).
Area
Sensitivity Rating (ASR) of Noise Sensitive Receivers
5.3.7. According to the latest Outline Zoning Plan (OZP) (No. S/H20/21) in the area, there are existing industrial zoning areas at the east and southeast of the proposed Project.
5.3.8. According to the Annual Traffic Census of 2013 published by the Transport Department (TD), the annual average daily traffic (AADT) at Wing Tai Road Flyover was about 36,620 vehicles per day while the AADT at Island Eastern Corridor (IEC) between Mong Lung Street and Wing Tai Road was about 54,600 vehicles per day. By definition, these two roads are IFs within the study area in accordance with the IND-TM.
5.3.9. Chai Wan area is an urban district consisting of high-rise developments. NSR 2 to NSR 8 are either directly or indirectly affected by IFs. Therefore, an ASR of C would be assigned to these NSRs. Since there is no direct line-of-sight between some residential premises at Block 50 of Heng Fa Chuen (NSR 1) (e.g. Room 8) and IEC, an ASR of B ,which would impose a more stringent fixed plant noise assessment criteria, would be assigned to the entire Block 50 as a conservative approach.
5.3.10. The identified ASRs of the NSRs are tabulated in Table 5.6 below.
Table 5.6 Identified Area Sensitivity Ratings of NSRs
NSR ID |
Name of Building |
IF |
Directly Affected/
Indirectly Affected / Not Affected |
ASR |
NSR 1 |
Heng Fa Chuen
Block 50 |
IEC |
Not affected |
B |
NSR 2 |
Hong Kong
Institute of Vocational Education (Chai Wan) - Academic Block |
IEC & Wing Tai Road Flyover |
Directly affected |
C |
NSR 3 |
Knight Court Flat
C & D |
IEC |
Directly affected |
C |
NSR 4 |
Tsui Shou House,
Tsui Wan Estate |
Wing Tai Road Flyover |
Directly affected |
C |
NSR 5 |
Endeavourers Chan
Cheng Kit Wan Kindergarten |
Wing Tai Road Flyover |
Directly affected |
C |
NSR 6 |
Tsui Fuk House,
Tsui Wan Estate |
Wing Tai Road Flyover |
Directly affected |
C |
NSR 7 |
Tsui Hong House,
Tsui Wan Estate |
Wing Tai Road Flyover |
Directly affected |
C |
NSR 8 |
Planned THEi New
Campus |
Wing Tai Road Flyover |
Directly affected |
C |
Note: In any event, the ASR assumed in the EIA Report is only indicative and it is used for assessment only. It should be noted that the fixed noise sources are controlled under Section 13 of the NCO. Therefore, the Noise Control Authority shall determine noise impact from concerned fixed noise sources on the basis of prevailing legislation and practices being in force, and taking account of contemporary conditions/ situations of adjoining land uses. Nothing in the EIA study shall bind the Noise Control Authority in the context of law enforcement against any of the fixed noise sources being assessed.
5.3.11. In order to determine the fixed plant noise assessment criteria, prevailing background noise surveys were conducted on 20 and 22 September 2014 and 16 May 2015. The lowest measured background noise levels in the same time period were adopted for determining the fixed plant noise assessment criteria. The survey locations are shown in Figure 5.2. The results of the prevailing background noise surveys and the fixed plant noise assessment criteria are shown in Table 5.7 and Appendix 5.2. As NSR 2, NSR 5 and NSR 8 are educational institutions, there is no night-time operation as confirmed by the institutions and thus no night-time prevailing background noise measurement was conducted for these NSRs.
Table 5.7 Lowest Measured Prevailing Background Noise Levels for NSRs and Fixed Plant Noise Assessment Criteria
NSR ID |
Location
ID |
Lowest
Measured Background Noise Level Leq
(30mins) dB(A) |
ANL
¡V 5 dB(A) |
Fixed
Plant Noise Assessment Criteria Leq (30mins) dB(A) |
|||
Day/
evening time |
Night-time |
Day/
evening time |
Night-time |
Day/
evening time |
Night-time |
||
NSR 1 |
NLM 1 |
57 |
54 |
60 |
50 |
57 |
50 |
NSR 2 |
NLM 2 |
64 |
N/A |
65 |
N/A |
64 |
N/A |
NSR 3 |
NLM 3 |
58 |
56 |
65 |
55 |
58 |
55 |
NSR 4 |
NLM 4 |
70 |
62 |
65 |
55 |
65 |
55 |
NSR 5 |
NLM 5 |
71 |
N/A |
65 |
N/A |
65 |
N/A |
NSR 6 |
NLM 6 |
66 |
60 |
65 |
55 |
65 |
55 |
NSR 7 |
NLM 7 |
65 |
58 |
65 |
55 |
65 |
55 |
NSR 8 |
NLM 8 |
72 |
N/A |
65 |
N/A |
65 |
N/A |
Note:
[1] ¡§N/A¡¨ denotes not applicable.
[2] The lowest measured background noise
levels in the same time period were adopted for determining the fixed plant
noise assessment criteria.
5.4.1. The Project site is located in Chai Wan. The surrounding land uses comprise residential, recreational, community and industrial uses. Site visit conducted on 20 May 2014 revealed that the background noise environment of the representative NSRs was dominated by traffic noise mainly from Shing Tai Road, IEC and Wing Tai Road Flyover and to a lesser extent from Sheung On Street, Sheung Tat Street and Sheung Mau Street. There are also 2 bus maintenance depots operated by Citybus Limited and New World First Bus Services Limited in the vicinity.
5.5.1. The potential sources of noise impact during the construction phase of the proposed Project are the use of PME for various construction activities. As broadly indicated in the preliminary construction programme in Appendix 3.1, the construction of the proposed Project would tentatively start in Mid-2016 and last for about 29 months. The major construction activities include:
¡P Site formation, excavation and filling;
¡P Foundation; and
¡P Main building construction.
5.5.2. Referring to Section 2.3.24, conventional steel H-piling is considered to be more preferable for the proposed Project and a CNP in force issued by the Noise Control Authority is required for carrying out percussive piling. As the issuance of a CNP depends on the application submitted by the Contractor, noise assessment for percussive piling activities is not included in this EIA study.
5.5.3. In order to provide a realistic noise assessment for the construction activities, the percentage on-time of PME to be operated on site were considered when calculating the total sound power level (SWL) of the construction activities. The Architectural Services Department (ArchSD) confirmed the validity of the assumed construction plant inventory and considered the percentage on-time of the plant reasonable.
5.5.4. Operational noise from and associated with the proposed Project includes the following:
¡P Fixed plant noise
- Vehicle repair / testing activities
- Mechanical ventilation and air conditioning system (MVAC) equipment and other fixed noise sources equipment
¡P Road traffic noise
Fixed
Plant Noise ¡V Vehicle Repair / Testing Activities
5.5.5. During the operation phase, noise sources shall include vehicle repair / testing activities for vehicles and engine noise emission from vehicles from the HKPF PVP&EC, EMSD and FEHD Depots. Major vehicle repair / testing activities at the EMSD Depot will be conducted from 0800 to 1800 hours on weekdays, whilst the vehicle / testing activities at the HKPF will be taken place on irregular basis due to operational needs. The HKPF PVP&EC will be operated 24 hours on 7 days per week basis. All of the vehicle repair / testing activities will be carried out within the covered area.
5.5.6. Vehicle repair / testing activities during night-time period will be avoided as far as practicable. Occasional testing and examination work for HKPF PVP&EC may be carried out for urgent need of the HKPF. As a conservative approach, night-time operation is included in this study. Details of fixed plant noise emitted from night-time operation at the HKPF PVP&EC are shown in Appendix 5.6.
5.5.7. For the planned vehicle repair / testing activities as advised by the EMSD, most of them would be the same as the existing workshop at Sheung On Street, Chai Wan. In this connection, the SWLs, operation frequencies and durations will be adopted from the approved EIA study for EMSD Hong Kong Workshop at Sheung On Street, Chai Wan (AEIAR-202/2012). In addition to the existing vehicle repair / testing activities, the EMSD proposed other activities which were not included in the existing workshop. Regarding these additional activities, the approved EIA Report for Reprovisioning of FEHD Sai Yee Street Environmental Hygiene Offices-cum-vehicle Depot at Yen Ming Road, West Kowloon Reclamation Area (AEIAR-216/2013) will be referenced.
5.5.8. All vehicle repair / testing activities of the proposed Project were verified by the future users, and it has been discussed in detail in Section 3.3. A variety of equipment will be provided in the proposed Project but not all of them would be considered to be significant noise sources in this study, because of their SWL and nature of operation. The details are given in Table 5.8.
5.5.9. SWLs associated with the identified noise sources as listed in Table 5.8 are obtained by making reference to the approved EIA Reports for New World First Bus Permanent Depot at Chai Wan (AEIAR-029-2000), Proposed Headquarters and Bus Maintenance Depot in Chai Wan (AEIAR-045/2001), Reprovisioning of FEHD Sai Yee Street Environmental Hygiene Offices-cum-vehicle Depot at Yen Ming Road, West Kowloon Reclamation Area (AEIAR-216/2013) and EMSD Hong Kong Workshop at Sheung On Street, Chai Wan (AEIAR-202/2012).
5.5.10. It is noticed that no SWL data for brake test strip can be adopted from previously approved EIA reports for other projects, on-site noise measurements were therefore conducted at the existing HKPF Depot in Quarry Bay to obtain the relevant noise level information for the assessment. The noise measurement methodology and estimated noise levels are presented in Appendix 5.9.
Table 5.8 Identification of Noise Sources
Location |
Activity |
Equipment |
Noise
Source |
Remark |
HKPF
PVP&EC |
Braking test (on Grade) |
Brake test strip |
Yes |
Noise
level information obtained from on-site noise measurements |
Braking test (on Slope) |
Brake test ramp |
No |
The vehicle engine is either
set at idle or off |
|
Braking test (for Vehicles other than
Motorcycle) |
Roller brake tester with a load simulator |
No |
The vehicle engine is set at
idle |
|
Motorcycle
speedometer calibration |
Motorcycle speedometer calibrator |
Yes |
SWL
obtained from AEIAR-202/2012 |
|
Use of compressed air, e.g. for screw driving |
Pneumatic tools |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Hammering |
Hammer |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Vehicle parking |
-- |
No |
Vehicle moving at a
low speed |
|
Vehicle lifting |
Vehicle lifting hoists |
No |
The hoists are
electrically powered with small output motors |
|
Vehicle examination (in pit) |
-- |
No |
The vehicle engine is set at
idle |
|
Vehicle examination (at ground) |
-- |
No |
The vehicle engine is set at
idle |
|
EMSD
Depot |
Braking test (for vehicles other than motorcycle) |
Roller brake tester |
Yes |
SWL
obtained from AEIAR-216/2013 |
Braking test (for motorcycle) |
Motorcycle brake tester |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Speedometer testing (for motorcycle) |
Motorcycle speedometer |
Yes |
SWL
obtained from AEIAR-202/2012 |
|
Tyre balancing |
Tyre balancer |
No |
Spinning of tyres will
be conducted at a low speed |
|
Tyre changing |
Tyre changer |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Hammering |
Hammer |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Use of compressed air, e.g. for screw driving |
Pneumatic tools |
Yes |
SWL
obtained from AEIAR-216/2013 |
|
Vehicle washing |
-- |
No |
Manual washing only |
|
Vehicle lifting |
Vehicle lifting hoists |
No |
The hoists are
electrically powered with small output motors |
|
Engine testing |
-- |
No |
The vehicle engine is set at
idle |
|
Vehicle parking |
-- |
No |
Vehicle moving at
a low speed |
|
Battery charging |
Automatic
battery charger |
No |
No
moving part |
|
Chemical mixing, e.g. lubricant mixing |
Lubricant dosing equipment |
No |
Manual operation only |
|
FEHD
Depot |
Vehicle washing |
Automatic vehicle washing machine |
Yes |
SWL
obtained from AEIAR-216/2013 |
Water refilling for vehicles |
Water refilling machine |
No |
The vehicle engine is set at
idle |
|
Vehicle parking |
-- |
No |
Vehicle moving at
a low speed |
|
GL
Specialist Laboratory |
Vehicle parking |
-- |
No |
Vehicle moving at
a low speed |
Chemical testing |
-- |
No |
No
moving part |
Fixed
Plant Noise - Corrections
5.5.11. Corrections for tonality, intermittency or impulsiveness for each MVAC equipment and other fixed noise sources and vehicle repair / testing activity are determined according to the IND-TM.
5.5.12. A correction of + 3 dB(A) for impulsiveness was applied to hammering activities. For correction for tonality, as information was not available, a correction of + 6 dB(A) was applied to water pumps and transformers as a conservative assumption in this assessment. The corrections for tonality, impulsiveness and intermittency were not applied to the rest of the MVAC equipment and other fixed noise sources and vehicle repair / testing activities.
5.5.13. The quantities, referenced SWLs, operation durations and operation frequencies of workshop equipment and repair / testing activities in the proposed Project are shown in Appendix 5.6.
Fixed
Plant Noise ¡V MVAC equipment and other fixed noise sources
5.5.14. MVAC equipment and other fixed noise sources associated with the operation of the proposed Project were identified as potential noise sources. They will be enclosed within plant rooms except the outdoor units of the air conditioning system on roof.
5.5.15. The locations of key fixed noise sources are shown on the preliminary design layout plans in Figure 5.4. The estimated quantity of identified noise sources to be operated during day/ evening and night-time periods are shown in Appendix 5.6.
Road Traffic
Noise
5.5.16. The proposed Project does not involve the construction of new roads. However, vehicles entering and leaving the proposed Project may potentially increase the traffic noise levels at the NSRs. Vehicles are expected to access the proposed Project via IEC to/ from other districts, and passing by Sheung On Street, Sheung Mau Street, Shing Tai Road and Shun Tai Road.
5.5.17. As shown in Appendix 5.3, the predicted AM peak of road traffic flow of the proposed Project is 43 vehicles at 0800 to 0900 hours and the PM peak is 36 vehicles at 1500 to 1600 hours. The proof of endorsement of the traffic forecast data by TD and the proposed ingress/ egress routings provided in the technical note of traffic forecast submitted to TD are enclosed in Appendix 5.3. According to a letter dated 24 September 2014, TD had no comment on the technical note of traffic forecast for EIA study for the proposed Project from a traffic point of view.
5.6.1. Methodology for assessing noise impacts from the construction activities associated with the proposed Project is developed based on the GW-TM and is summarised as follows:
¡P
Identification of notional noise source locations of the work site with
respect to NSRs;
¡P
Determination of distance attenuation and screening effects between NSRs
and notional noise sources;
¡P
Estimation of construction noise levels at NSRs in the absence of any
mitigation measures;
¡P
Proposal of mitigation measures and evaluation of their effectiveness;
and
¡P
Determination of residual impacts.
5.6.2. The adopted approach to assess the noise impact is in line with the Guidance Note titled ¡§Preparation of Construction Noise Impact Assessment under the Environmental Impact Assessment Ordinance¡¨ (GN 9/2010).
5.6.3. The proposed NAPs for the construction noise impact assessment are summarised in Table 5.5. The NAPs were identified at the worst façade location nearest to the proposed Project. The construction inventory for the major construction activities are shown in Appendix 5.5 and the locations of notional noise sources are provided in Figure 5.3.
5.6.4. The construction noise impact was then assessed against the noise standards given in the EIAO-TM as shown in Table 5.1.
Fixed
Plant Noise
5.6.5. As discussed in Section 5.5, major fixed plant noise sources of the proposed Project include vehicle repair / testing activities and operation of MVAC equipment and other fixed noise sources.
5.6.6. The noise sources of the vehicle repair / testing activities and MVAC equipment and other fixed noise sources were identified based on the preliminary design layout plans.
5.6.7. The assessment approach for the fixed plant noise impacts from the proposed Project was conducted with consideration of standard acoustic principles and are summarised as follows:
¡P
SWLs associated with the operation of mechanical equipment and vehicle were
obtained from previously approved EIA reports discussed in Section 5.5.9;
¡P
On-site noise measurements were conducted to obtained the SWLs if no
data was available from previous approved EIA report; and
¡P
Sound pressure levels (SPLs) at NAPs were calculated based on distance
attenuation, tonality correction, impulsiveness correction, intermittency
correction, percentage on-time correction, barrier correction, quantity
correction and façade correction.
5.6.8. The quantity and the operation duration of vehicle repair / testing activities and MVAC equipment and other fixed noise sources at the proposed Project were verified by the future users.
5.6.9. Since the design of the equipment to be installed in the plant rooms was not available during the course of this study, the maximum allowable SWLs for MVAC equipment & other fixed noise sources would be determined taking into account of the concurrent operational noise from vehicle repair / testing activities.
Road
Traffic Noise
5.6.10. The road traffic noise impact was evaluated according to the ¡§Calculation of Road Traffic Noise¡¨ published by the Department of Transport UK and Guidance Note titled ¡§Road Traffic Noise Impact Assessment under the Environmental Impact Assessment Ordinance¡¨ (GN 12/2010). Noise models for the road traffic noise impact assessment were established using computer simulation software RoadNoise 2000.
5.6.11. The extent of road sections at IEC paved with polymer modified friction course as low noise road surface as advised by the Highways Department is presented in Appendix 5.4. A correction of -3.5 dB(A) was added to the BNLs for all road sections paved with low noise road surface.
5.6.12. The road traffic noise impact contributed by road traffic generated from vehicles entering and leaving the proposed Project on the NSRs in the vicinity was evaluated in Section 5.7.
5.7.1. The extent of construction noise impacts depends on the type and number of PME to be used in different construction activities and hence may vary throughout the construction phase. As shown in Appendix 3.1, the preliminary construction programme is expected to last for about 29 months. For the purpose of this EIA study, the construction period is assumed to start from mid-2016 to end-2018. The construction activities are expected to be conducted during normal daytime working hours only (i.e. 0700 to 1900 hours on any day not being a Sunday or general holiday).
5.7.2. Concurrent projects were also taken into account in the construction noise assessment. One concurrent project was identified. The anticipated works for the planned THEi New Campus are shown in Table 5.9.
Table 5.9 Anticipated Works of Planned THEi New Campus
Anticipated Work |
Anticipated Construction
Period |
Anticipated Construction
Work of the Project |
Foundation
works |
Mar
2014 ¡V Oct 2014 |
Nil |
Superstructure
works |
Nov
2014 ¡V Jun 2016 |
Nil |
Interior
fitting out and users moving-in |
Feb
2016 ¡V Aug 2016 |
Site
formation, excavation and filling work from mid-2016 |
5.7.3. Construction plant inventory for interior fitting out works for the planned THEi New Campus was reviewed and confirmed by the Project Proponent of the planned THEi New Campus. It was estimated based on the best available information. The construction plant inventory, calculation of unmitigated construction noise impact from the proposed Project alone and cumulative construction noise impact are provided in Appendix 5.5.
5.7.4.
No examination will be
scheduled at the kindergarten (NSR 5) as confirmed by the institution. The
examination schedule for academic year 2014-2015 provided by the Hong Kong
Institute of Vocational Education (Chai Wan) (NSR 2) is listed in Table 5.10. It is assumed that the examination periods will be scheduled from
January to July each year and last around 54 days in each academic year. No
examination schedule for the planned THEi New Campus could be obtained at the
time of preparation of this study. However, examinations are unlikely to be
arranged in September and October of each academic year at the THEi New Campus,
which was verified by t the Vocational Training Council (VTC)
.
Table 5.10 Examination Schedule of Hong Kong Institute of Vocational Education (Chai Wan) for Academic Year 2014 - 2015
Examination Period
(Academic year 2014 ¡V 2015) |
No. of Days
(including Saturdays) |
September 2014 |
Nil |
October 2014 |
Nil |
November 2014 |
Nil |
December 2014 |
Nil |
January 2015 |
21 |
February 2015 |
Nil |
March 2015 |
2 |
April 2015 |
4 |
May 2015 |
9 |
June 2015 |
11 |
July 2015 |
7 |
August 2015 |
Nil |
5.7.5.
Table 5.11 and Table 5.12 summarise the predicted construction noise levels due to the Project
only and predicted cumulative construction noise levels respectively. The
maximum construction noise levels during normal daytime working hours were
predicted. The results indicate that construction activities of the proposed Project,
if unmitigated, would cause exceedance of the construction noise standards at the
Hong Kong Institute of Vocational Education (Chai Wan) - Academic Block (NAP 201)
and Planned THEi New Campus (NAP 801) during examination periods. Mitigation
measures are therefore considered to minimize the construction noise impact.
Table 5.11 Predicted Construction Noise Levels at Representative NAPs during Normal Daytime Working Hours due to the Project Only for Unmitigated Scenario
NAP ID |
Description |
ANL, dB(A) |
Predicted Maximum Construction Noise Level, dB(A) |
||
Site Formation, Excavation and Filling |
Foundation |
Main Building Construction |
|||
NAP
101 |
Heng Fa Chuen Block 50 |
75 |
63 |
63 |
63 |
NAP
201 |
Hong
Kong Institute of Vocational Education (Chai Wan) - Academic Block |
70/65 [1] |
70 |
70 |
70 |
NAP
202 |
56 |
55 |
55 |
||
NAP
301 |
Knight
Court Flat C & D |
75 |
59 |
59 |
59 |
NAP
401 |
Tsui
Shou House, Tsui Wan Estate |
75 |
63 |
63 |
63 |
NAP
501 |
Endeavourers
Chan Cheng Kit Wan Kindergarten |
70 [2] |
63 |
63 |
63 |
NAP
601 |
Tsui
Fuk House, Tsui Wan Estate |
75 |
62 |
62 |
62 |
NAP
701 |
Tsui
Hong House, Tsui Wan Estate |
75 |
62 |
62 |
62 |
NAP
801 |
Planned
THEi New Campus (i.e.
Classrooms from 5/F onwards) |
70/65 [1] |
67 |
67 |
67 |
NAP
802 |
55 |
55 |
55 |
Notes:
[1] Construction noise criteria for schools are 70 dB(A) at normal school days and 65 dB(A) during examinations.
[2] No examinations will be scheduled at Endeavourers Chan Cheng Kit Wan Kindergarten and only construction noise criteria for school at normal school days will be applied.
[3] Noise levels exceeding the construction noise criteria are bolded.
Table 5.12 Predicted Cumulative Construction Noise Levels at Representative NAPs during Normal Daytime Working Hours for the Unmitigated Scenario
NAP ID |
Description |
ANL, dB(A) |
Predicted Maximum Construction Noise Level, dB(A) |
NAP 101 |
Heng
Fa Chuen Block 50 |
75 |
64 |
NAP 201 |
Hong
Kong Institute of Vocational Education (Chai Wan) - Academic Block |
70/65 [1] |
72 |
NAP 202 |
59 |
||
NAP 301 |
Knight
Court Flat C & D |
75 |
66 |
NAP 401 |
Tsui
Shou House, Tsui Wan Estate |
75 |
72 |
NAP 501 |
Endeavourers
Chan Cheng Kit Wan Kindergarten |
70 [3] |
71 |
NAP 601 |
Tsui
Fuk House, Tsui Wan Estate |
75 |
67 |
NAP 701 |
Tsui
Hong House, Tsui Wan Estate |
75 |
55 |
NAP 801 |
Planned
THEi New Campus (i.e.
Classrooms from 5/F onwards) |
N/A [4] |
|
NAP 802 |
Notes:
[1] Construction noise standards for schools are 70 dB(A) at normal school days and 65 dB(A) during examinations.
[2] Noise levels exceeding the construction noise standards are bolded.
[3] No examinations will be scheduled at Endeavourers Chan Cheng Kit Wan Kindergarten and only construction noise standards for school at normal school days were applied.
[4] Planned THEi New Campus is the concurrent project under construction and thus no cumulative construction noise level applied.
Fixed
Plant Noise
5.7.6. During the operation phase, noise impacts due to the fixed plant noise sources including vehicle repair / testing activities, MVAC equipment and other fixed noise sources were assessed. Based upon the assumptions discussed in Section 5.6, the predicted fixed plant noise levels at the NAPs are shown in Table 5.13. Detailed calculations of fixed plant noise impact assessment and the maximum allowable SWL of each equipment, which should not be exceeded in order to comply with the fixed plant noise assessment criteria, are presented in Appendix 5.6.
5.7.7. It is anticipated that there should be no sudden change in noise levels at various floor levels at all the NAPs. The predicted maximum fixed plant noise levels at the NAPs at representative floors (high, mid and low zones) are presented in Table 5.13 and comply with both day/ evening time and night-time fixed plant noise assessment criteria.
5.7.8. If there is any change in design information during detailed design stage or fitting-out stage, the design of fixed plant should be reviewed by the Engineer/ Contractor to ensure that both the NCO and fixed plant noise criteria at the NSRs will be met in the future.
Table 5.13 Summary of Predicted Fixed Plant Noise Levels at NAPs
NAP
ID |
Level
|
Assessment
Height (m) |
Predicted
Maximum Noise Level, Leq
(30mins) dB(A) |
ANL, Leq
(30mins) dB(A) |
||
Day-time
& Evening |
Night-time |
Day-time
& Evening |
Night-time |
|||
NAP 101 |
1/F |
8.7 |
57 |
49 |
57 |
50 |
10/F |
35.7 |
57 |
49 |
|||
21/F |
68.7 |
57 |
49 |
|||
NAP 201 |
1/F |
6.4 |
63 |
No operation in night-time |
64 |
No operation in night-time |
3/F |
12.4 |
63 |
||||
6/F |
21.4 |
63 |
||||
NAP 202 |
1/F |
6.4 |
49 |
No operation in night-time |
64 |
No operation in night-time |
3/F |
12.4 |
49 |
||||
6/F |
21.4 |
49 |
||||
NAP 301 |
1/F |
10.2 |
50 |
44 |
58 |
55 |
12/F |
43.2 |
50 |
44 |
|||
24/F |
79.2 |
50 |
43 |
|||
NAP 401 |
1/F |
8.4 |
57 |
50 |
65 |
55 |
15/F |
50.4 |
57 |
50 |
|||
30/F |
95.4 |
57 |
50 |
|||
NAP 501 |
G/F |
5.4 |
57 |
No operation in night-time |
65 |
No operation in night-time |
NAP 601 |
1/F |
8.9 |
56 |
49 |
65 |
55 |
15/F |
50.9 |
56 |
49 |
|||
30/F |
95.9 |
56 |
49 |
|||
NAP 701 |
1/F |
8.4 |
56 |
48 |
65 |
55 |
15/F |
50.4 |
56 |
49 |
|||
30/F |
95.4 |
56 |
49 |
|||
NAP 801 |
5/F |
26.8 |
61 |
No operation in night-time |
65 |
No operation in night-time |
9/F |
43.6 |
61 |
||||
13/F |
60.2 |
61 |
||||
NAP 802 |
5/F |
26.8 |
49 |
No
operation in night-time |
65 |
No operation in night-time |
9/F |
43.6 |
49 |
||||
13/F |
60.2 |
49 |
Road
Traffic Noise
5.7.9. The predicted AM and PM peaks of the road traffic caused by the proposed Project are at 0800 to 0900 hours and 1500 to 1600 hours respectively. By comparing the noise levels between ¡§with project¡¨ and ¡§without project¡¨ during the AM and PM peaks, the highest noise contribution from the operation of the proposed Project could be determined.
5.7.10. In order to assess the significance of the noise contribution, the assessment year shall be within 15 years upon tentative commencement of the operation, i.e. 2018. It is anticipated that there is no major change in the traffic pattern for Years 2014, 2018 and 2033. Gradual natural increase in traffic flow is expected in the coming 15 years and thus Year 2033 is determined to be the assessment year in which the traffic flow will be the highest. The traffic forecasts for ¡§with project¡¨ and ¡§without project¡¨ scenarios for Years 2018 and 2033 were provided by the Traffic Consultant of the proposed Project and were endorsed by TD. The endorsed traffic forecasts and the proof of the endorsement by TD are summarised and provided in Appendix 5.3.
5.7.11. The noise contribution from the road traffic generated by the proposed Project is considered insignificant when the difference in traffic noise levels at the NSRs with and without the project is less than 1.0 dB(A).
5.7.12. The predicted overall traffic noise levels at NAPs during both AM and PM peaks in Year 2033 for the ¡§with project¡¨ and ¡§without project¡¨ scenarios are summarised in Appendix 5.7. The assessment results indicated that noise contribution from road traffic generated by the proposed Project will be in the range of 0.0 dB(A) to 0.2 dB(A) at all NAPs in Year 2033 scenario. The noise contribution is considered insignificant (i.e. less than 1.0 dB(A)) under the worst case scenario. The operation of the proposed Project is anticipated to have no significant contribution to road traffic noise impact on the NSRs.
5.8.1.
Mitigation measures are
required for the NSRs at which unmitigated construction noise levels are
predicted to exceed the corresponding construction noise standards as shown in Table 5.12.
5.8.2. A number of available construction noise mitigation measures are proposed in this assessment, including:
¡P
Selection and optimisation of construction programmes, such as avoidance
of simultaneous operation of noisy PME, and/or reduction in the percentage on-time
of PME during noise sensitive periods such as school examination period;
¡P
Use of quality powered mechanical equipment (QPME) and quiet working
methods;
¡P
Use of movable at-source noise mitigation measures such as movable noise
barriers, noise enclosures, noise jacket and mufflers;
¡P
Implementation of good site practices to limit noise from construction
site; and
¡P
Preparation of Construction Noise Management Plan before construction
commencement.
Selection
and Optimisation of Construction Programmes
5.8.3. 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 simultaneous operation of noisy PME in order to minimise the total noise generated during the construction periods. Limiting the quantity of PME to be operated concurrently and also the percentage on-time of PME were recommended in the proposed Project and incorporated in this assessment. The proposed quantity of PME and their percentage on-time were confirmed feasible by the Project Proponent. In the case during school examination when a more stringent construction noise standard is imposed, the potentially most disruptive construction activities should be avoided and arranged to be conducted during school holidays as far as practicable.
Use of
QPME and Quiet Working Methods
5.8.4. QPME is defined as a PME having actual SWL lower than the value specified for PME in the GW-TM. SWLs for typical PMEs provided in the GW-TM and that for equivalent QPME are presented in Table 5.14.
5.8.5. The use of QPME can result in reduction in noise levels. It is possible to further reduce the noise impact by adopting quiet working methods and specifying maximum SWL for specific plant equipment.
5.8.6. The QPME adopted in this assessment is for reference only and to be confirmed by the Contractor, in view of the actual construction conditions and programmes. Whilst QPME are listed, the Contractor may be able to obtain particular models of plant that are quieter than the QPMEs listed. The associated mitigation measures to the particular PME should be reviewed by the Contractor and.
Table 5.14 Maximum SWLs for Selected QPME
Identification Code in GW-TM |
Description |
SWL in GW-TM, dB(A) |
Example in QPME List from EPD |
SWL of QPME, dB(A) |
CNP 081 |
Excavator/
loader, wheeled/ tracked |
112 |
EPD-02383 |
92 |
CNP 101 |
Generator,
Standard |
108 |
EPD-00668 |
79 |
CNP 186 |
Roller,
vibratory |
108 |
EPD-00509 |
95 |
CNP 065 |
Drill/
grinder, hand-held (electric) |
98 |
Other [1] |
89 |
CNP 048 |
Mobile
Crane |
112 |
EPD-02602 |
102 |
CNP 170 |
Poker,
vibratory, hand-held |
113 |
Other [1] |
102 |
Note: [1] It refers to examples in "Sound Power Levels of Other Commonly Used PME"
Use of Movable
Noise Barriers
5.8.7. Movable noise barrier is very effective in screening noise from construction plant. Noise barrier located close to a PME can produce at least 10 dB(A) screening for stationery plant and 5 dB(A) for mobile plant provided that the direct line-of-sight of the PME is blocked. Subject to site condition, the noise barriers should be placed near to the construction plant as far as practical.
5.8.8. Barrier material of surface mass in excess of 10 kg/m2 is recommended to achieve the maximum screening effect. The Contractor shall be responsible for the design of the movable noise barrier with due consideration given to the size of the PME and the requirement of intercepting the line-of-sight of the PME, as well as ensuring that the barrier should have no openings and gaps.
Implementation
of Good Site Practices
5.8.9. Good site practices and noise management can provide considerable reductions in noise impact of the site activities. The following practices should be followed while carrying out construction works for the proposed Project:
¡P
Use only well-maintained and regularly-serviced plant during the works;
¡P
Turn off or throttle down the plant in intermittent use to a minimum;
¡P
Orient the plant known to emit noise strongly in one direction to face
away from the NSRs;
¡P
Use silencers, mufflers and enclosures for plant where possible and maintain
properly throughout the works;
¡P
Site fixed plant as far away from NSRs as possible; and
¡P
Use stockpiles of excavated materials and other structures such as site
buildings effectively to screen noise from the works.
Fixed
Plant Noise ¡V Vehicle Repair / Testing Activities
5.8.10. The future operators should ensure that the vehicle repair / testing activities are carried out under the covered area of the proposed Project as the building itself provides noise screening to the NSRs.
5.8.11. As the ANL during night-time (2300 to 0700 hours next day) is more stringent than that of the day/ evening time (0700 to 2300 hours), the future operators should avoid carrying out vehicle repair / testing activities during night-time as far as practicable.
Fixed
Plant Noise ¡V MVAC equipment and other fixed noise sources
5.8.12. With reference to ¡§Good Practices on Ventilation System Noise Control¡¨ (GP-VS), acoustic treatments, such as acoustic louvres, silencers and enclosures, could be applied to achieve noise attenuation. Prior to the operation phase of the proposed Project, as part of the design process, commissioning test should be conducted to ensure the fixed plant noise shall comply with relevant noise criteria and such requirement should be included in the tender document and/or specification.
5.8.13. A regular plant maintenance programme should be developed and implemented so that equipment is properly operated and serviced in order to maintain a controlled level of noise. The programme should be implemented by trained personnel.
Road
Traffic Noise
5.8.14. The assessment results demonstrate that with the low level of traffic generation from the proposed Project, operation of the proposed Project will have no significant contribution to road traffic noise impact on the NSRs. No mitigation measure is needed for the road traffic noise.
5.9.1. Construction noise calculation was carried out with the incorporation of different noise mitigation measures as discussed in Section 5.8, as far as practicable according to the actual construction condition and limitation.
5.9.2. Table 5.15 and Table 5.16 summarise the predicted construction noise levels due to the Project only and cumulative construction noise levels at NAPs under mitigated scenario respectively. The detailed calculations are shown in Appendix 5.8.
Table 5.15 Predicted Construction Noise Levels at Representative NAPs under Mitigated Scenario due to the Project Only
NAP ID |
Description |
ANL, dB(A) |
Predicted Maximum Construction Noise
Level, dB(A) |
||
Site Formation, Excavation and Filling |
Foundation |
Main Building Construction |
|||
NAP
101 |
Heng Fa Chuen Block 50 |
75 |
62 |
58 |
58 |
NAP
201 |
Hong
Kong Institute of Vocational Education (Chai Wan) - Academic Block |
70/ 65 [1] |
69 |
65 |
65 |
NAP
202 |
55 |
50 |
50 |
||
NAP
301 |
Knight
Court Flat C & D |
75 |
58 |
54 |
54 |
NAP
401 |
Tsui
Shou House, Tsui Wan Estate |
75 |
62 |
58 |
58 |
NAP
501 |
Endeavourers
Chan Cheng Kit Wan Kindergarten |
70 [2] |
62 |
58 |
58 |
NAP
601 |
Tsui
Fuk House, Tsui Wan Estate |
75 |
61 |
57 |
57 |
NAP
701 |
Tsui
Hong House, Tsui Wan Estate |
75 |
61 |
57 |
57 |
NAP
801 |
Planned
THEi New Campus (i.e.
Classrooms from 5/F onwards) |
70/ 65 [1] |
66 |
62 |
62 |
NAP
802 |
54 |
50 |
50 |
Notes:
[1] Construction noise criteria for schools are 70 dB(A) at normal school days and 65 dB(A) during examination periods.
[2] No examinations will be
scheduled at Endeavourers Chan Cheng Kit Wan Kindergarten and only
construction noise standards for school at normal school days wasonly
construction noise standards for school at normal school days were
applied.
[3] Noise levels exceeding
the construction noise standards are
bolded.
Table 5.16 Predicted Cumulative Construction Noise Level at Representative NAPs under Mitigated Scenario
NAP ID |
Description |
ANL, dB(A) |
Predicted Maximum Construction Noise Level, dB(A) |
|
|
NAP
101 |
Heng
Fa Chuen Block 50 |
75 |
64 |
|
|
NAP
201 |
Hong
Kong Institute of Vocational Education (Chai Wan) - Academic Block |
70/65 [1] |
71 |
|
|
NAP
202 |
58 |
|
|||
NAP
301 |
Knight
Court Flat C & D |
75 |
66 |
|
|
NAP
401 |
Tsui
Shou House, Tsui Wan Estate |
75 |
72 |
|
|
NAP
501 |
Endeavourers
Chan Cheng Kit Wan Kindergarten |
70 [2] |
71 |
|
|
NAP
601 |
Tsui
Fuk House, Tsui Wan Estate |
75 |
67 |
|
|
NAP
701 |
Tsui
Hong House, Tsui Wan Estate |
75 |
73 |
|
|
NAP
801 |
Planned
THEi New Campus (i.e.
Classrooms from 5/F onwards) |
N/A [3] |
|
||
NAP
802 |
|
|
Notes:
[1] Construction noise standards for schools are 70 dB(A) at normal school days and 65 dB(A) during examination periods.
[2] No examinations will be scheduled at Endeavourers Chan Cheng Kit Wan Kindergarten and only construction noise standards for school at normal school days will be applied.
[3] Planned THEi New Campus is the concurrent project under construction and thus no cumulative construction noise level applied.
[4] Noise levels exceeding the construction noise standards are bolded.
5.9.3.
In view of the results shown in
Table 5.15 and Table 5.16, the predicted construction noise levels with mitigation measures
at the representative NSRs, except NSR 2, shall comply with the construction noise
standards including the criterion during examination period.
5.9.4. The predicted construction noise levels at the Hong Kong Institute of Vocational Education (Chai Wan) (NAP 201) comply with the corresponding construction noise criterion during normal school days but exceedance is expected during examination period when the criterion will be 65 dB(A), when site formation, excavation and filling works take place in July 2016. According to the examination schedule provided by the Hong Kong Institute of Vocational Education (Chai Wan), the duration of the exceedance was 7 days. In this connection, the Contractor should keep close liaison with the nearby educational institutions to obtain the examination schedule and should control noise from their construction works such as avoiding concurrent operation of noisy PME, and /or reduction in the percentage on-time of PME during school examination periods. A Construction Noise Management Plan shall be provided by the Contractor before commencement of the construction to avoid noise exceedance.
5.9.5. Noise mitigation measures as proposed in Section 5.8 are recommended to be implemented as far as practicable in order to minimise the potential construction noise impact associated with the proposed project.
5.9.6. With the MVAC and other fixed noise sources properly selected with mitigation measures where necessary to meet the maximum allowable SWLs, no adverse fixed noise impact is anticipated.
Road
Traffic Noise
5.9.7. The assessment results demonstrate that with the low level of traffic generation from the proposed Project, operation of the proposed Project will have no significant contribution to road traffic noise impact on the NSRs. No mitigation measure is necessary.
5.10.1. As mentioned in Section 5.3.5 and 5.3.6, although the nearby educational institutions are provided with A/Cs for ventilation, there will be a possibility that the abovementioned schools to rely on opened windows for ventilation. Exceedance is expected during examination period when the noise criteria will be 65 dB(A), when site formation, excavation and filling works take place in July 2016. According to the examination schedule provided by the Hong Kong Institute of Vocational Education (Chai Wan), the duration of the exceedance will be around 7 days. In this connection, the Contractor should keep close liaison with the nearby educational institutions to obtain the examination schedule and should control noise from their construction works such as avoiding concurrent operation of noisy PME, and /or reduction in the percentage on-time of PME during school examination periods. A Construction Noise Management Plan shall be provided by the Contractor before commencement of the construction to avoid noise exceedance.
5.10.2. With the MVAC and other fixed noise sources properly selected with mitigation measures where necessary to meet the maximum allowable SWLs, no adverse fixed noise impact is anticipated.
5.10.3. The assessment results demonstrate that with the low level of traffic generation from the proposed Project, operation of the proposed Project will have no significant contribution to road traffic noise impact on the NSRs. No mitigation measure is necessary.
5.11.1. Noise monitoring at the nearby NSRs during the construction phase of the proposed Project is recommended. Environmental monitoring and audit (EM&A) programme is proposed to be established to ensure the implementation of mitigation measures as well as a noise complaint handling mechanism. Details of the programme are provided in a stand-a-lone EM&A Manual.
5.11.2. With the implementation of the recommended noise mitigation measures and use of a set of specified maximum SWLs for the MVAC equipment and other fixed noise sources, no adverse impact is expected during the operation phase. Noise monitoring during the operation phase of the proposed Project is considered not necessary.
5.12.1. With the implementation of the recommended mitigation measures such as the use of QPME, limiting the number of construction plants operating concurrently, using movable noise barriers and adopting good site practices, adverse construction noise impact is not anticipated except at NSR 2. As it is close to the site, NSR 2 is predicted to expose to construction noise exceeding the relevant noise standard during examination period when site formation, excavation and filling works take place in mid-2016. The duration of the exceedance is expected to be around 7 days. It is recommended that more detailed construction planning, which includes the arrangement on work sequence and plant locations, etc. before actual construction work is undertaken by the Contractor, and practicable noise mitigation measures should be implemented according to the actual site condition and constraints, in order to reduce the construction noise impact. In this connection, the Contractor should keep close liaison with the nearby educational institutions to obtain the examination schedule and should control noise from their construction works such as avoiding concurrent operation of noisy PME, and /or reduction in the percentage on-time of PME during school examination periods. A Construction Noise Management Plan shall be provided by the Contractor before commencement of the construction to avoid noise exceedance.
5.12.2. Environmental monitoring and auditing procedures are recommended in EM&A Manual to ensure the implementation of construction noise mitigation measures as well as to establish a noise complaint handling mechanism.
5.12.3. With the implementation of the mitigation measures for vehicle repair / testing activities (such as vehicle repair / testing activities to be carried out under the covered area during daytime and evening as far as possible) and the MVAC and other fixed noise sources properly selected with mitigation measures where necessary to meet the maximum allowable SWLs, adverse fixed noise impact on the NSRs is not anticipated during operation phase.
5.12.4. A comparison of the noise levels for the ¡§with project¡¨ and ¡§without project¡¨ scenarios predicted for year 2033 (i.e. the worst case scenarios) indicated that traffic noise contribution from the road traffic generated by the proposed Project will be insignificant. Therefore, operation of the proposed Project will have no significant contribution to road traffic noise impact on the nearby NSRs.