3. NOISE

3.1 Introduction

3.1.1 In this section, the requirements, methodology, equipment, monitoring locations, criteria and protocols for the monitoring and audit of noise impacts during the construction and operational phase of the Project are presented.

Construction Phase

3.1.2 Construction noise impacts from this Project are predicted at the identified NSRs during the normal daytime working hours. Noise mitigation measures would be required to reduce noise levels to the stipulated standard. A noise monitoring programme shall be undertaken to ensure such mitigation measures would be implemented properly.

Operational Phase

3.1.3 After completion of WCR, CBL and Road D4 Flyover, a traffic noise monitoring shall be carried out at the NSRs in the vicinity of the recommended direct mitigation measures at these roads including WCR/P2, CBL, D9 and the D4 Flyover. The purpose of the monitoring is to ascertain that the noise levels would comply with the noise criteria at the sensitive receivers, and that the recommended mitigation measures are effective in suppressing the noise levels.

3.1.4 It is also recommended that noise monitoring shall be carried out during the commissioning stage of the WCR Eastern Ventilation Building in order to ensure compliance of the operational airborne noise levels with the TM’s stipulated noise standard after the implementation of silencers for the reversible fans.

3.2 Noise Parameters

Construction Phase

3.2.1 The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (L_eq). L_{eq (30 minutes)} shall be used as the monitoring parameter for the time period between 0700 and 1900 hours on normal weekdays. For all other time periods, L_{eq (5 minutes)} shall be employed for comparison with the Noise Control Ordinance (NCO) criteria.

3.2.2 Supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference. A sample data record sheet is shown in Appendix B for reference.

Operational Phase

Traffic Noise

3.2.3 The traffic noise level shall be measured twice within the first year of the road opening. Measurement shall be made in terms of A-weighted L₁₀ over three half-hour periods during the peak traffic hour. Other metrics like L_eq may be added as seen fit. A sample data record sheet is shown in Appendix B for reference.

Fixed Plant Noise

3.2.4 Noise measurements shall be made in accordance with the procedures outlined in the ‘Technical Memorandum for the Assessment of Noise from Places other than Domestic Premises, Public Places and Construction Sites’ (IND-TM) and shall be conducted at a time when the ventilation buildings and pumping stations are operating at maximum capacity.

3.2.5 Two types of measurement shall be carried out:

(i) Broadband measurement of L_{eq (30 minutes)} dB(A). Shorter measurement period may be used if it can be demonstrated that the noise level is constant.

(ii) Frequency analysis between 31.5Hz and 16kHz measurement at 1/3 octave intervals. If the noise emanating from the louvre is found to be tonal (as defined in IND-TM) then an appropriate tonal correction shall be applied to the measured noise level to achieve the corrected noise level (CNL). The CNL shall be compared with the noise specifications.

3.3 Monitoring Equipment

3.3.1 As referred to in the Technical Memorandum (TM) issued under the NCO, sound level meters in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications shall be used for carrying out the noise monitoring. Immediately prior to and following each noise measurement the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements shall be accepted as valid only if the calibration level from before and after the noise measurement agree to within 1.0 dB.

3.3.2 Noise measurements shall not be made in fog, rain, wind with a steady speed exceeding 5ms^-1 or wind with gusts exceeding 10ms^-1. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m s^-1.

3.3.3 The ET is responsible for the provision of the monitoring equipment. He shall ensure that sufficient noise measuring equipment and associated instrumentation are available for carrying out the baseline monitoring, regular impact monitoring and ad hoc monitoring. All the equipment and associated instrumentation shall be clearly labelled. The equipment installation location shall be proposed by the ET Leader and agreed with the ER and EPD in consultation with the IC(E).

3.4 Monitoring Locations

Construction Phase

3.4.1 Figures 3.1a and 3.1b show the noise monitoring locations for the construction phase. The proposed noise monitoring locations are summarised in Table 3.1 below.

Table 3.1 Proposed Construction Noise Monitoring Stations

Station	NSR ID Reference (Based on EIA Report)	Location
CM1	CKL2	Existing Residential Development along Cha Kwo Ling Road
CM2	EHC1	Residential Development near Eastern Harbour Crossing
CM3	CP	Chung Pak House, Hong Pak Court
CM4	V1	Village House at North of Eastern Portal of WCR
CM5	OSC2	Area 72 – Ocean Shores
CM6	65C2	Area 65 – Site 65C – Planned School Area
CM7	N14	Area 86 – MTRC Area 86 Development

3.4.2 The status and locations of noise sensitive receivers may change after issuing this Manual. If such cases exist, the ET shall propose updated monitoring locations and seek approval from the ER and IC(E) and agreement from EPD of the proposal.

3.4.3 When alternative monitoring locations are proposed, the monitoring locations shall be chosen based on the following criteria:

(i) at locations close to the major site activities which are likely to have noise impacts;

(ii) close to the noise sensitive receivers; and

(iii) for monitoring locations located in the vicinity of the sensitive receivers, care shall be taken to cause minimal disturbance to the occupants during monitoring.

3.4.4 The construction noise monitoring station shall normally be at a point 1 m from the exterior of the sensitive receivers building façade and be a position 1.2m above the ground. If there is a problem with access to the normal monitoring position, an alternative position shall be chosen, and a correction to the measurements shall be made. For reference, a correction of +3dB(A) shall be made to the free field measurements. The ET shall agree with the ER and IC(E) on the monitoring position and the corrections adopted. Once the positions for the monitoring stations are chosen, the baseline monitoring and the impact monitoring shall be carried out at the same positions.

Operational Phase

Traffic Noise

3.4.5 The traffic noise monitoring locations are shown in Figure 3.2a and 3.2b and are summarised in Table 3.2. The monitoring locations shall be selected according to the following criteria:

(i) they shall be at NSRs in the vicinity of recommended direct technical remedies;

(ii) one high floor and one medium floor monitoring points shall be chosen at each location as far as possible; and

(iii) selected monitoring locations shall enable monitoring to be done twice within one year after implementation of the mitigation measures during operation of the proposed road.

Table 3.2 Proposed Traffic Noise Monitoring Stations

Station	NSR ID Reference (Based on EIA Report)	Location
OM1	H10	KMS Housing Development at the South of WCR
OM2	H14	KMS Housing Development at the South of WCR
OM3	TKC2	Area 57 - Park Central
OM4	N4	Area 86 - MTRC Area 86 Development
OM5	N10	Area 86 - MTRC Area 86 Development

3.4.6 The status and locations of the noise sensitive receivers may change after issuing this Manual. If such cases exist, the ET shall propose updated monitoring locations and seek approval from the ER and IC(E) and agreement from EPD of the proposal.

3.4.7 When alternative monitoring locations are proposed, the monitoring locations shall be chosen based on the following criteria:

(i) alternative location shall be similarly exposed to potential noise impacts;

(ii) shall be close to the noise sensitive receivers; and

(iii) shall be located so as to cause minium disturbance to the occupants.

3.4.8 The traffic noise monitoring shall be carried out a distance of 1m from the openable window and 1.2m above the floor level of the noise sensitive receivers identified. The ET shall agree with the IC(E) on any necessary corrections adopted.

Fixed Plant Noise

3.4.9 The monitoring location for the WCR Eastern Ventilation Building is shown in Figure 3.3 and is summarised in Table 3.3. The proposed location is the closest NSRs to the fixed noise sources.

Table 3.3 Proposed Fixed Noise Monitoring Station

Station	NSR ID Reference (Based on EIA Report)	Location
FM1	V1	Village Houses at North of Eastern Portal of WCR

3.5 Baseline Monitoring

Construction Phase

3.5.1 Baseline noise monitoring shall be carried out daily in all of the identified monitoring stations for at least 2 weeks prior to the commissioning of the construction works. A schedule of the baseline monitoring shall be submitted to the ER for approval before the monitoring starts.

3.5.2 During the baseline monitoring, there shall not be any construction activities in the vicinity of the monitoring stations.

3.5.3 In exceptional cases, when insufficient baseline monitoring data or questionable results are obtained, the ET leader shall liaise with EPD and in consultation with ER and the IC(E) to agree on an appropriate set of data to be used as a baseline reference.

Operational Phase

3.5.4 No baseline operational noise monitoring is generally required.

3.6 Impact Monitoring

Construction Phase

3.6.1 Noise monitoring shall be carried out at all the designated monitoring stations. The monitoring frequency shall depend on the scale of the construction activities. The following is an initial guide on the regular monitoring frequency for each station on a per week basis when noise generating activities are underway:

(i) One set of measurements between 0700 and 1900 hours on normal weekdays.

3.6.2 If construction works are extended to include works during the hours of 1900 - 0700, additional weekly impact monitoring shall be carried out during evening and night-time works. Applicable permits under NCO shall be obtained by the Contractor.

3.6.3 In case of non-compliance with the construction noise criteria, more frequent monitoring, as specified in the Action Plan in Table 3.5 shall be carried out. This additional monitoring shall be continued until the recorded noise levels are rectified or proved to be irrelevant to the construction activities.

Operational Phase

Traffic Noise

3.6.4 Traffic noise monitoring shall be carried out at all the designated traffic noise monitoring stations. The following is an initial guide on the traffic noise monitoring requirements during the operational phase:

(i) one set of measurements at the morning traffic peak hour on normal weekdays;

(ii) one set of measurement at the evening traffic peak hour on normal weekdays;

(iii) a concurrent census of traffic flow and percentage heavy vehicles shall be conducted for the far-side and near-side of the road and the existing road network in the vicinity of each measurement points;

(iv) average vehicle speed estimated for far-side and near-side of the road and the existing road network in the vicinity of each measuring points; and

(v) the two sets of monitoring data shall be obtained within the first year of operation.

3.6.5 Measured noise levels shall be compared with the predicted noise levels by applying appropriate conversion corrections to allow for the traffic conditions at the time of measurement. Appendix B shows a sample data record sheet for traffic noise monitoring.

Fixed Plant Noise

3.6.6 It is recommended that noise monitoring shall be carried out for the Eastern Ventilation Building on two occasions: Day 1 of commissioning and Day 60 of operation.

(i) Noise measurements shall be conducted at a time when the ventilations building is operating at maximum capacity.

3.7 Event and Action Plan

Construction Phase

3.7.1 The Action and Limit levels for construction noise are defined in Table 3.4. Should non-compliance of the criteria occur, action in accordance with the Action Plan in Table 3.5 shall be carried out.

Table 3.4 Action and Limit Levels for Construction Noise

Time Period	Action Level	Limit Level
0700 – 1900 hours on normal weekdays	When one documented complaint is received	75 dB(A)

Table 3.5 Event and Action Plan for Construction Noise

EVENT	ACTION
	ET	IC(E)	ER	CONTRACTOR
Action Level	1. Notify IC(E) and Contractor; 2. Carry out investigation; 3. Report the results of investigation to the IC(E), ER and Contractor; 4. Discuss with the Contractor and formulate remedial measures; 5. Increase monitoring frequency to check mitigation effectiveness.	1. Review the analysed results submitted by the ET; 2. Review the proposed remedial measures by the Contractor and advise the ER accordingly; 3. Supervise the implementation of remedial measures.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analysed noise problem; 4. Ensure remedial measures are properly implemented.	1. Submit noise mitigation proposals to IC(E); 2. Implement noise mitigation proposals.
Limit Level	1. Identify source; 2. Inform IC(E), ER, EPD and Contractor; 3. Repeat measurements to confirm findings; 4. Increase monitoring frequency; 5. Carry out analysis of Contractor’s working procedures to determine possible mitigation to be implemented; 6. Inform IC(E), ER and EPD the causes and actions taken for the exceedances; 7. Assess effectiveness of Contractor’s remedial actions and keep IC(E), EPD and ER informed of the results; 8. If exceedance stops, cease additional monitoring.	1. Discuss amongst ER, ET, and Contractor on the potential remedial actions; 2. Review Contractors remedial actions whenever necessary to assure their effectiveness and advise the ER accordingly; 3. Supervise the implementation of remedial measures.	1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Require Contractor to propose remedial measures for the analysed noise problem; 4. Ensure remedial measures properly implemented; 5. If exceedance continues, consider what portion of the work is responsible and instruct the Contractor to stop that portion of work until the exceedance is abated.	1. Take immediate action to avoid further exceedance; 2. Submit proposals for remedial actions to IC(E) within 3 working days of notification; 3. Implement the agreed proposals; 4. Resubmit proposals if problem still not under control; 5. Stop the relevant portion of works as determined by the ER until the exceedance is abated.

Operational Phase

3.7.2 For the traffic noise, the measured/monitored noise levels shall be compared with the predicted results and the predicted traffic flow conditions (calculated noise levels based on concurrent traffic census obtained). In case discrepancies are observed, explanation shall be given to justify the discrepancies.

3.7.3 For the fixed noise from the proposed Eastern Ventilation Buildings, the measured/monitor noise levels shall be compared with the TM’s stipulated noise standards. In case discrepancies are observed, explanation shall be given to justify the discrepancies.

3.8 Mitigation Measures

Construction Phase

Quieter powered mechanical equipment

3.8.1 It is recommended to use quieter PME to reduce construction noise impacts on the affected NSRs during construction. The construction area and tasks to be adoption of quiet plant are listed as follows.

(a) TCS, TKL, PSK & TKOL Development

- Mobilisation

- Removal of Preloading Mound

- Drains, Sewers, Waterworks, Utilities and Roadworks for L651, L661, L662, L671, 672, 673, 681, L721 & L722

- Box Culvert Realignment

- Piled Deck at Western Box Culvert

- Landscape Works

- Rasing of Existing Seawall (for the work site in vicinity of NSR 65C2 only)

(b) Engineering Infrastructure for TKOL

- Northern Cycletrack Footbridge across EC

- Cycletrack and Footpath along TKOL

- Southern Footbridge across EC (for the work site in vicinity of NSRs 65C2 only)

(c) Western Coast Road – Reclamation Phase 1

- Filling behind seawall

- Surcharging and Consolidation (Surcharge Removal)

- Access Ramp to Tunnel Portal

(d) Western Coast Road – Reclamation Phase 2

- Surcharging and Consolidation (Surcharge Removal)

(e) Western Coast Road – Toll Plaza and At-grade Roads

- Road Embankment

- Construction of Concrete Pavement

- Toolbooths and footbridge

(f) Western Coast Road – Section between Western Portal and Road A

- Excavation at Tunnel Portal

- Site Formation and construction of New Lam Tin Ambulance Deport

- Ambulance Depot Construction

- Clearance and Demolition of Ambulance Deport

- Filling at ex-EHC Casting Basin

- Foundation Works for Bridge Abutment and Piers

- Bridge Deck Construction

- Drainage and Utilities Works, at-grade Road Construction, Roadworks and Signage

- Installation of noise barriers / enclosures

- Landscape Works

(g) Western Coast Road – Section between Road A and VFP

- Excavation Works, Cut and Cover tunnel

- Piling Works, Pile Caps, Columns, Abutment Construction

- Bridge Deck Construction

(h) Cross Bay Link – Viaduct Section (Bridges A, B & C)

- Piling Works, Pile Cap & Column, Bridge Deck and Roadworks, Waterworks & Signage

(i) Cross Bay Link – Road Section along Area 86

- Drainage, Waterworks and Utilities Works

- Roadworks and Signage, Noise Barrier Installation and Landscape Works

- Laying of 300mm diameter Watermain along Wan Po Road

(j) WCR/CBL/Road P2 Interchange

- Bridge Deck Construction

- Roadworks and Singnage

- Natural terrain mitigation works and Landscape Works

(k) D4 Flyover

- Piling Works, Pile Cap & Column Construction, Bridge Deck Construction

- Drainage, Waterworks, Utilities, Roadworks & Noise Barrier Installation

- Landscape Works

(l) Road P2 (Depressed Section)

- Diaphragm Wall, Piling Works, Wall & Slab Construction

- Decking Construction

- Pumping Station Construction

- Drainage, Waterworks, Utilities, Roadworks

(m) Road P2 (At-Grade Section)

- Drainage, Waterworks, Utilities Works

- Road Works & Landscape Works

Movable Noise Barrier

3.8.2 It is recommended to use movable noise barrier for particular plant during construction. The construction tasks that require to be adoption of noise barriers are summarised as follows.

(a) TCS, TKL, PSK & TKOL Development

- Roadworks for L661 & L662 (cantilever barrier for School “65C3”)

- Landscape Works

- Roadworks for L673 and Road L681 (cantilever barrier for School “67S3” only)

- Road L681 (for school “65C2”only)

- Drains Sewers, waterworks, utilities for Road L661 & L662 (for School “65C3” only)

(b) Western Coast Road – Section between Western Portal and Road A

- Clearance and Demolition of Ambulance Depot

- Foundation Works for Bridge Abutment and Piers

- Bridge Deck Construction

- Roadworks & Signage and Noise barrier /enclosure installation

- Excavation at Tunnel portal (for School “StA” only)

- Site formation for New Lam Tin Ambulance Report (for “StA” only)

- Filling at ex-EHC Casting Basin (for “StA” only)

(c) Western Coast Road – Section between Road A & VFP

- Bridge Deck Construction

(d) Cross Bay Link – Road Section along Area 86

- Noise Barrier Installation

- Laying of 300mm diameter watermain along Wan Po Road

(e) D4 Flyover

- Pile Cap & Column Construction

- Bridge Deck Construction

- Roadworks and Noise Barrier Installation

(f) Road P2 (Depressed Section)

- Diagraph Wall, Piling Works, Wall & Slab Construction

- Decking Construction

- Pumping Station Construction

- Roadworks

(g) Road P2 (At-grade Section)

- Roadworks

Good Site Practice

3.8.3 Good site practices listed below should be adopted during the construction phase.

· The contractor should site noisy equipment and activities as far from sensitive receivers as is practical.

· Intermittent noisy activities should be scheduled to minimize exposure of nearby NSRs to high levels of construction noise.

· Idle equipment should be turned off or throttled down.

· Noisy equipment should be properly maintained and used no more often than is necessary.

· Construction activities should be planned so that parallel operation of several sets of equipment close to a given receiver is avoided.

· Where possible, the numbers of concurrently operating items of plant should be reduced through sensitive programming.

· A noise monitoring programme should be instigated.

3.8.4 In order to minimise the nuisance of the short duration of the blasting noise, the following mitigation measures are recommended to be implemented:

Ÿ The Contractor shall establish a communication channel with the nearest NSRs to liaise on the blasting schedule and inform them any scheduled blasting in advance.

Ÿ Sufficient time shall be allowed for alerting all the potential sensitive receivers through established channel of communication prior to each and every blasting activity.

Ÿ Proper procedures shall be put in place to alert and minimise any startling effect on the vehicle drivers and pedestrians.

Ÿ Subject to detailed design to be conducted by the Contractor (i.e. a Design and Built Contractor), trial tests could be conducted to evaluate the optimal amount of charge to be used for each blasting.

Operational Phase

Road traffic Noise

Area 78 - Pak Shing Kok

3.8.5 For Pak Shing Kok (Area 78), it is recommended the following measures to be implemented for future development in Area 78E.

· Maximum of 50 m setback from site boundary facing Wan Po Road and junction of Wan Po Road and Road L781.

· 10 m setback from the footpath of Road L781 for Area 78A, 78B & 78E.

· 5 m high boundary wall at the site boundary of Area 78E facing Wan Po Road and Road L781.

Area 86 near Road L861

3.8.6 In order to alleviate the traffic noise arising from Road L861 on Area 86 MTRC Development, the following mitigation measures were recommended.

· A 100 m long cantilevered barrier, 5.5L6 (5.5 m high vertical barrier with 4 m cantilever length at 45 degrees), located at at-grade Road L861.

· A 30 m long cantilevered barrier, 5.5L3 (5.5 m high vertical barrier with 4.5m cantilever length at 45 degrees), located at at-grade Road L861.

· Low noise surfacing on at-grade Road L861 eastbound and westbound (~ 230 m in length).

Area 57, 65B, 65C, 66D, 67, 73B, 74N, and 74S

3.8.7 The following direct mitigation measures are recommended on the proposed ‘new’ roads to alleviate adverse traffic noise impacts at affected NSRs including NSRs at Area 57, 65B, 65C, 66D, 67, 74N, and 74S.

· A 200 m long and 3 m high vertical barrier, along the edge of the parapet of the eastbound carriageway of Road D4 Flyover (CH230 – CH430) for NSRs at Area 57.

· 10 - 15 m setback from the footpath of Chi Shin Street for Area 65 - Site 65B (R2) and also Site 65C (OU).

· 3 m high boundary wall for planned schools at Area 67 and Area 74S (standard measures according to Class Assessment Document prepared by Arch SD).

· 15 m setback from the footpath of Tong Chun Street for Area 66 – Site 66D.

· 15 m setback from the footpath of Road L673 for Area 67.

3.8.8 Regarding NSRs at Area 73B, Housing Department would implement the mitigation measures recommended in their own environmental assessment study. Measures according to the Class Assessment Document for Standards School such as air-conditioning and window glazing would be provided for affected educational institutes including NSR 65C1 – 65C3, 67S4 – 67S6, 74S1 – 74S6 and school facades at Area 86.

Direct Noise Mitigation Measures on Kowloon Section of the WCR

3.1.1In order to alleviate the traffic noise impacts on affected NSRs, appropriate mitigation measures are recommended. The following mitigation measures are recommended on Kowloon Section of the WCR and associated new roads.

·Low-noise road surfacing material on part of the WCR, slip road S2 to S4 and part of Cha Kwo Ling Road including roundabout of Cha Kwo Ling Road to Road A.

·A 210 m long cantilevered barrier, L2 (6 m high vertical barrier with 3.5 m horizontal cantilever length), located at the edge of the parapet of the eastbound carriageway of the WCR (~ CH 4220 – CH4430).

·A 120 m long partial enclosure (6 m high) for the eastbound carriageway of the WCR (CH4430 – CH4550).

·A 270 m long full enclosure (6 m high) for both carriageways of the WCR (CH4450 – CH4720).

·Two 80 m long cantilevered barriers, L1 (6 m high vertical barrier with 5 m horizontal cantilever length), located at both edges of the parapet of the two carriageways of the WCR (CH4720 – CH4800).

·A 40 m long full enclosure (6m high) for both carriageways of the WCR (CH4800 – CH4840).

·A 100 m long full enclosure (5.5m high) for both carriageways of the WCR (CH4900 – CH5000).

·A 416 m long partial enclosure (5.5 m high) covering both carriageways, located at the edge of parapet of the westbound carriageway of the WCR (CH5100 – CH5516).

·A 250 m long cantilevered barrier, L4 (5.5 m high vertical barrier with 3 m cantilever length at 45° to the horizontal), located at the edge of the parapet of the west of the Slip Road EHC 2 (~ CH 070 – CH 320).

·A 300 m long cantilevered barrier, L3 (5.5 m high vertical barrier with 3.5 m horizontal cantilever length), located at the edge of the parapet of the west of the Slip Road EHC 3 (~ CH 100 – CH 400).

·A 7 m high partial enclosure covering both carriageways of Road A (CH 530 – CH 650) instead of the 130 m long cantilevered barrier (CNB-A) of Road A, which was proposed in the “Feasibility Study for Development at CKL Kaolin Mine Site”.

Noise Mitigation Measures on TKO Areas

3.1.1The following direct mitigation measures (DMMs) are recommended on the proposed ‘new’ roads to alleviate adverse traffic noise impacts at affected NSRs in TKO Areas.

·Low-noise road surfacing materials for carriageways of Road L651 between Po Yap Road and Chi Shin Street (~110m in length, CH490 –CH600).

·Low-noise road surfacing materials for carriageways of Road P2 (CH 8970 – CH9370).

·A 200 m long and 3 m high vertical barrier, along the edge of the parapet of the eastbound carriageway of road P2 flyover (CH230 – CH430).

3.1.1For planned residential, educational institutes and other specified use development in TKO areas, podium, setback from source lines and/ or boundary walls are recommended to alleviate traffic noise impacts.

·10m setback from Chi Shin Street for Area 65 – Site 65B (R2) and also Site 65c (OU).

·Proposed 9 m high podium around boundary for Area 73B (R2 zone) with 5 m setback from Choi Ming Street and 15m setback from Chui Ling Road above the podium.

·3 m high boundary wall for Educational Institute Areas (Area 67, Area 73B and Area 74S).

·5 m setback from Tong Chun Street for Area 66 – Site 66D.

·15 m setback from Road L673 for Area 67.

3.1.1For MTRC Area 86 Development near CBL, in addition to the measures proposed from the developer, the following barriers are proposed to alleviate traffic noise impact from CBL and Road D9.the following mitigation measures would be proposed on the CBL and Road D9 assuming that no canopy installed at the podium of the MTRC Development along CBL and Road D9.

·Low-noise road surfacing materials for the CBL (CH 8900 – CH9440).

·A 120118 m long cantilevered barrier (5.5 m high vertical barrier with 3 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriageway of CBL (CH 9150 – CH 927068).

·A 14032 m long cantilevered barrier (5.5 m high vertical barrier with 41.5 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriageway of the Road D9CBL (CH 9268728 – CH 9300868).

·A 10016 m long cantilevered barrier (5.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the kerb of the central divider eastbound carriageway of the CBL (CH 9300 – CH 941600).

·A 20034 m long cantilevered barrier (5.5 m high vertical barrier with 4.5 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriagewaythe central divider of Road D9 (CH 9466500 – CH 9700).

·A 60168 m long cantilevered barrier (5.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the central dividerkerb of the eastbound carriageway of Road D9 (CH 9700 – CH 9760868).

·A 110 m long cantilevered barrier (5.5 m high vertical barrier with 3 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriageway of Road D9 (CH 9760 – CH 9870).

·A 30 m long cantilevered barrier (6.5 m high vertical barrier with 4.5 m cantilever length at 45° to the horizontal), located at the central divider of the CBL (CH 9270 – CH 9300).

·A 118 m long cantilevered barrier (6.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the central divider of the CBL (CH 9300 – CH 9418).

·A 152 m long cantilevered barrier (5.5 m high vertical barrier with 4.5 m cantilever length at 45° to the horizontal), located at the central divider of Road D9 (CH 9500 – CH 9652).

·A 108 m long cantilevered barrier (5.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the central divider of the CBL (CH 9652 – CH 9760).

·A 110 m long cantilevered barrier (5.5 m high vertical barrier with 4.5 m cantilever length at 45° to the horizontal), located at the central divider of the CBL (CH 9760 – CH 9870).

3.1.1For MTRC Area 86 Development near Road L861, the following mitigation measures would be proposed to alleviate the traffic noise arising from Road L861.

·A 80 m long cantilevered barrier (5.5 m high vertical barrier with 4 m cantilever length at 45° to the horizontal), located at Road L861 westbound (CH 3740 – CH 4504).

3.1.1Indirect mitigation measures such as installation of air conditioning and appropriate window glazing are recommended for the affected school represented by NSR 74S5 – 74S6, NSR 67S5 – 67S6, NSR 65C1 – 65C34 and Po Kok Secondary School.

Noise Mitigation Measures on Pak Shing Kok

3.1.1The recommended building heights at Area 78E (Pak Shing Kok) to be implemented in the design stage are as follows:

·Only allow for + 73 mPD high building (about 2 storey) if it has at least 10 m setback.

·Only allow for +78.6 mPD high building (about 4 storeys) if it has at least 20 m setback.

·Only allow for +87.0 mPD high building (about 6 storeys) if it has at least 40 m setback.

·Only allow for +89.8 mPD high building (about 8 storeys) if it has at least 50 m setback.

3.1.1For NSRs along Road L781, a 20 m setback is required for Area 78.

Western Coast Road

3.8.9 The following direct mitigation measures are recommended on Kowloon Section of the WCR and associated new roads to alleviate adverse traffic noise impacts at affected NSRs.

· Low-noise road surfacing material on slip road S2 to S4 of WCR, part of Cha Kwo Ling Road and part of Road A near WCR.

· A 210 m long cantilevered barrier, 6L2 (6 m high vertical barrier with 3.5 m horizontal cantilever length), located at the edge of the parapet of the eastbound carriageway of the WCR (~ CH 4220 – CH4430).

· A 105 m long partial enclosure (6 m high) for the eastbound carriageway of the WCR (CH4430 – CH4535).

· A 285 m long full enclosure (6 m high) for both carriageways of the WCR (CH4435 – CH4720).

· Two 80 m long cantilevered barriers, 6L1 (6 m high vertical barrier with 5 m horizontal cantilever length), located at both edges of the parapet of the two carriageways of the WCR (CH4720 – CH4800).

· A 40 m long full enclosure (6m high) for both carriageways of the WCR (CH4800 – CH4840).

· A 100 m long full enclosure (5.5m high) for both carriageways of the WCR (CH4900 – CH5000).

· A 460 m long partial enclosure (5.5 m high) covering both carriageways, located at the edge of parapet of the westbound carriageway of the WCR (CH5056 – CH5516).

· A 250 m long cantilevered barrier, 5.5L1 (5.5 m high vertical barrier with 3 m cantilever length at 45° to the horizontal), located at the edge of the parapet of the west of the Slip Road EHC 2 (~ CH 070 – CH 320).

· A 70 m long cantilevered barrier, 5.5L2 (5.5 m high vertical barrier with 3.5 m horizontal cantilever length), located at the edge of the parapet of the west of the Slip Road EHC 3 (~ CH 100 – CH 170).

· A 235 m long partial enclosure (5.5 m high) for the Slip Road EHC 3 (~CH 170 – CH 405)

· A 7 m high partial enclosure covering both carriageways of Road A (CH 530 – CH 650) instead of the 130 m long cantilevered barrier (CNB-A) of Road A, which was proposed in the “Feasibility Study for Development at CKL Kaolin Mine Site”.

· A 65 m long and 3 m high vertical transparent barrier, with a setback distance from Cha Kwo Ling Road Roundabout. The installation of the barrier is subject to any objection from the temple owner, AMO and DO.

Cross Bay Link

3.8.10 For MTRC Area 86 Development near CBL, in addition to the measures proposed from the developer, the following barriers are proposed to alleviate traffic noise impact from CBL.

· A 120 m long cantilevered barrier, 5.5L1 (5.5 m high vertical barrier with 3 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriageway of CBL (CH 9150 – CH 9270).

· A 140 m long cantilevered barrier, 5.5L5 (5.5 m high vertical barrier with 1.5 m cantilever length at 45° to the horizontal), located at the kerb of the eastbound carriageway of the CBL (CH 9728 – CH 9868).

· A 100 m long cantilevered barrier, 5.5L4 (5.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the central divider of CBL (CH 9300 – CH 9400).

· A 200 m long cantilevered barrier, 5.5L3 (5.5 m high vertical barrier with 4.5 m cantilever length at 45° to the horizontal), located at the central divider of CBL (CH 9500 – CH 9700).

· A 168 m long cantilevered barrier, 5.5L4 (5.5 m high vertical barrier with 5 m cantilever length at 45° to the horizontal), located at the central divider of CBL (CH 9700 – CH 9868).

3.8.11 The following planned residential developments / educational institutes shall fulfil the specified setback requirements and to be implemented by PlanD for planned residential developments or Arch SD for planned educational institutes.

· Area 78A, 78C, 78E – 10 m setback from site boundary

· Area 65B, 65C, – at site boundary/5 m from site boundary

· Area 66B, 66C, 66D – 5 m setback from site boundary / boundary of breezeway

· Area 78 – 10m setback from site boundary

· Area 74S – 5m setback from site boundary

· Area 67 – at site boundary/5 m from site boundary

3.8.12 Two proposed landscape decks over Road P2 near Area 72 are recommended to alleviate traffic noise impact from Road P2 to Ocean Shores.

Noise from Proposed Ventilation Building

3.8.13 In order to alleviate the fixed noise impacts from the proposed Eastern Ventilation Building on the nearby NSRs, acoustic silencers for the reversible fans were proposed to diminish the impacts.