4. Noise Impact

4.1 Introduction

4.1.1 Potential noise impacts associated with the construction and operation of the Project are presented in this section. Construction noise impacts arising from construction of WCR, CBL, Road P2 and infrastructure for TKO further development areas would be expected at sensitive receivers in the vicinity of the work sites. Mitigation measures have been recommended where necessary to limit noise impacts to within acceptable levels.

4.1.2 During the operational phase, traffic noise impacts would be a major concern. Traffic noise assessment was undertaken for the representative noise sensitive receivers (NSRs) within 300 m from the boundary of the Study Area. Measures to mitigate adverse noise have been recommended where necessary.

4.1.3 Quantitative assessment for fixed noise sources from tunnel ventilation buildings and pumping stations has been undertaken to evaluate the potential operational noise impacts to the nearby existing and planned sensitive receivers. Appropriate mitigation measures are recommended to alleviate the noise impacts where necessary.

4.2 Environmental Legislation, Policies, Plans, Standards and Criteria

General

4.2.1 Noise impacts were assessed in accordance with the criteria and methodology given in the Technical Memoranda (TMs) issued under the Noise Control Ordinance (NCO), as well as the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM).

4.2.2 The NCO and EIAO provide the statutory framework for noise control. Assessment procedures and standards are set out in the following five Technical Memoranda:

· EIAO-TM.

· TM on Noise from Construction Work other than Percussive Piling (GW-TM).

· TM on Noise from Percussive Piling (PP-TM).

· TM on Noise from Construction Work in Designated Areas (DA-TM).

· TM on Noise from Places other than Domestic Premises, Public Places or Construction Sites (IND-TM).

Construction Noise – General Construction Works

4.2.3 The NCO provides the statutory framework for noise control of construction work, other than percussive piling, using powered mechanical equipment (PME) between the hours of 1900 and 0700 hours or at any time on Sundays or general holidays (that is, during restricted hours). Noise control on construction activities taking place at other times is subject to the Criteria for Evaluating Noise Impact stated in Table 1A of Annex 5 in the EIAO-TM. The noise limit is L_{eq (30 minutes)} 75 dB(A) at the façades of dwellings and 70 dB(A) at the façade of schools (65 dB(A) during examinations).

4.2.4 Between 1900 and 0700 hours and all day on Sundays and public holidays, activities involving the use of powered mechanical equipment (PME) for the purpose of carrying out construction work is prohibited unless a Construction Noise Permit (CNP) has been obtained. A CNP may be granted in cases where the noise can be contained within the Acceptable Noise Level (ANL) at the NSRs. ANLs are assigned depending upon the Area Sensitivity Ratings (ASRs). The corresponding basic noise levels (BNLs) for evening and nighttime periods are given in Table 4.1.

Table 4.1 Construction Noise Criteria for Activity other than Percussive Piling

Time Period	Basic Noise Level (BNLs)
	ASR A	ASR B	ASR C
Evening (1900 to 2300 hours) ^(1)	60	65	70
Night (2300 to 0700 hours)	45	50	55

Notes: (1) Includes Sundays and Public Holidays during daytime and evening

4.2.5 Despite any description or assessment made in this EIA Report on construction noise aspects, there is no guarantee that a Construction Noise Permit (CNP) will be issued for the project construction. The Noise Control Authority will consider a well-justified CNP application, once filed, for construction works within restricted hours as guided by the relevant Technical Memoranda issued under the Noise Control Ordinance. 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 deciding whether to grant a CNP. Nothing in this EIA Report should bind the Noise Control Authority in making its decision. If a CNP is to be issued, the Noise Control Authority should include in the permit any condition it thinks fit. Failure to comply with any such conditions will lead to cancellation of the CNP and prosecution under the NCO.

4.2.6 Under the TM on Noise from Construction Work in Designated Areas, the use of five types of Specified Powered Mechanical Equipment (SPME) and three types of Prescribed Construction Work (PCW) within a designated area during restricted hours would require a valid CNP. The SPME includes hand-held breaker, bulldozer, concrete lorry mixer, dump truck and hand-held vibratory poker. The PCW are:

· Erecting or dismantling of formwork or scaffolding.

· Loading, unloading or handling of rubble, wooden boards, steel bars, wood or scaffolding material.

· Hammering.

4.2.7 In general, it should not be presumed that a CNP would be granted for carrying out PCW within a designated area during restricted hours. The CNP may be granted for the execution of construction works during restricted hours involving the use of PME and/ or SPME if the relevant Acceptable Noise Levels and criteria stipulated in the GW-TM and DA-TM can be met.

Construction Noise – Percussive Piling

4.2.8 Percussive piling is prohibited between 1900 and 0700 hours on any weekday not being a general holiday and at any time on Sunday or general holiday. A CNP is required for carrying out of percussive piling between 0700 and 1900 hours on any day not being a general holiday. PP-TM sets out the requirements for working and determination of the permitted hours of operations. ANLs for percussive piling for different type of NSRs are shown in Table 4.2.

Table 4.2 Acceptable Noise Levels for Percussive Piling

NSR Window Type or Means of Ventilation	ANL, dB(A)
(i) NSR (or part of NSR) with no windows or other opening	100
(ii) NSR with central air conditioning system	90
(iii) NSR with windows or other openings but without central air conditioning system	85

Note: 10 dB(A) should be subtracted from the ANLs shown above for NSRs which are hospitals, medical clinics, educational institutes, courts of law or other NSRs which are considered by the Authority to be particularly sensitive to noise.

4.2.9 Diesel, pneumatic and/ or steam hammers are not allowed to be used in Hong Kong. The permitted hours of operation for carrying out of percussive piling work are listed in Table 4.3.

Table 4.3 Permitted Hours of Operation for Percussive Piling

Amount by which Corrected Noise Level (CNL) exceeds Acceptable Noise Level (ANL), CNL-ANL	Permitted hours of operation on any day not being a general holiday
10 dB(A) < CNL-ANL	0800 to 0900 AND 1230 to 1330 AND 1700 to 1800
0 dB(A) < CNL-ANL £ 10 dB(A)	0800 to 0930 AND 1200 to 1400 AND 1630 to 1800
CNL-ANL £ 0 dB(A)	0700 to 1900

Construction Noise – Blasting

4.2.10 There are no statutory procedures and criteria under the NCO and EIAO for assessing the blasting impacts and are therefore beyond the scope of the EIA. However, the administrative and procedural control of all blasting operations in Hong Kong is vested in the Mines Division of the Civil Engineering and Development Department (CEDD). The Dangerous Goods (General) Regulations, Chapter 295 also stipulates that no person shall carry out blasting unless he possesses a valid mine blasting certificate to be issued by the Mines Division of CEDD. The Superintendent of Mines will review the application on a case-by-case basis before issuing the Mine Blasting Certificate.

Operational Noise - Traffic Noise

4.2.11 Annex 5 “Criteria for Evaluating Noise Impact” of the EIAO-TM defines the criteria L_{10 (1 hour)} for road traffic noise at various NSRs:

· 70 dB(A) at the façades of dwellings, hotels, offices.

· 65 dB(A) at the façades of schools, places of public worship, courts of law, place where unaided voice communication is required.

· 55 dB(A) at the façades of hospital.

4.2.12 For traffic noise assessment, the roads within 300 m of the Project boundary have been included in the assessment. The roads are classified into one of the following categories:

· ‘Existing’ Roads - that is, roads that are unchanged or subject to minor changes by the Project.

· ‘New’ Roads - roads that are completely new or major modification to an existing road section that will result in 25% increase in lanes or substantial changes in alignment or characters of the existing road due to the proposed Project.

4.2.13 The ‘New’ roads defined for the assessment are shown in Appendices 4.4 and 4.5. The noise contribution from “new” roads should be less than 70 dB(A) at any dwelling (less than 65 dB(A) for educational institutions), so as to satisfy the relevant noise criteria, and there should not be any increase in traffic noise impact. In the case of an NSR where existing noise levels already exceed the relevant criteria, any increase in noise level contributed by the “new” roads should not be greater than 1 dB(A).

4.2.14 If any façades of NSRs are still exposed to predicted noise levels exceeding the relevant noise criteria after the implementation of all direct mitigation measures, provision of indirect technical remedies in the form of acoustic insulation and air conditioning should be considered under the EIAO-TM and the ExCo Directive “Equitable Redress for Persons Exposed to Increased Noise Resulting from the Use of New Roads”. The eligibility for indirect technical remedies will be tested against the following three criteria:

· The predicted overall noise level from the new road, together with other 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 in L_{10 (1 hour)}); and

· The predicted overall noise level is at least 1.0 dB(A) more than the prevailing traffic noise level, that is, the total 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 new road must be at least 1.0 dB(A).

Operational Noise – Fixed Noise Source

4.2.15 The NCO and IND-TM control fixed noise source such as ventilation shaft noise and pumping system noise. The appropriate Acceptable Noise Levels (ANL) generated by fixed plant at neighbouring NSRs are provided in the IND-TM. Based on the layout plan of the Project, three ventilation buildings (Western Portal Ventilation Building, Mid-Ventilation Building and Eastern Portal Ventilation Building) of WCR and three pumping stations (Pumping stations at Road P2, southern end of TKO Stage I Landfill near Area 86 (at the end of Road L861) and Area 78 adjacent to Road L781) were identified. Operational noise from these ventilation buildings and pumping stations would likely have potential noise impact on the nearby NSRs.

4.2.16 The representative NSRs in the vicinity of the Western Portal Ventilation Building, located in an urban area and near the Eastern Harbour Crossing, would be directly affected by traffic noise. Therefore, the Area Sensitivity Rating (ASR) has been assumed as “C”. For the Mid-Ventilation Building, there is no NSRs would be located within 300m from this ventilation building, the operation noise impact from Mid-Ventilation Building would be insignificant and quantitative assessment is considered unnecessary. Regarding the three pumping stations, they are located in an urban area but are not located near busy roads (defined as annual average daily traffic flow in excess of 30,000). In this connection, the Area Sensitivity Rating (ASR) for these NSRs has been assumed as ‘B’.

4.2.17 Representative NSRs in the vicinity of the Ventilation Building at the Eastern Portal of the WCR are located in a largely rural area and would be directly affected by traffic noise from the WCR in future. The ASR for these NSRs has been assumed as ‘B’. The ANLs for an ASR of ‘B’ and ‘C’ under the IND-TM are shown in Table 4.4. Since the EIAO-TM recommends that noise standard for fixed noise source is 5 dB(A) below the appropriate ANL, the noise criteria of 60/65 dB(A) (daytime and evening) and 50/55 dB(A) (night-time) have been adopted in the assessment.

Table 4.4 Acceptable Noise Level for Fixed Plant Noise

Time Period	NCO criteria			EIAO-TM
	ASR “A”	ASR ‘B’	ASR ‘C’	ASR “A”	ASR ‘B’	ASR ‘C’
Daytime and Evening (0700-2300 hours)	60	65	70	55	60	65
Night-time (2300-0700 hours)	50	55	60	45	50	55

4.2.18 In any event, the Area Sensitivity Rating assumed in this EIA Report is for indicative assessment only given that fans and damper arrangement at each ventilation building may be refined at the detailed design stage. It should be noted that fixed noise sources are controlled under section 13 of the NCO. At the time of investigation, the Noise Control Authority should determine noise impact from concerned fixed noise sources on the basis of prevailing legislation and practices being in force, and taking account of contemporary conditions/ situations of adjoining land uses. Nothing in this EIA Report should bind the Noise Control Authority in the context of law enforcement against all the fixed noise sources being assessed.

4.3 Description of the Environment

4.3.1 TKO is a new town with continued development in recent years. The areas proposed for development are those around the Western Coast Road (WCR), Cross Bay Link (CBL), Roads L781 and L782, L861, L651, L661, L662, L671, L672, L673, L681, L721, L722 and extended Road P2 and the associated Road D4 Flyover, including Areas 65, 66, 67, 68, 72, 73 and 78. The areas are mostly planned for residential use with some educational institutes. It is expected that traffic noise from the major new roads and the existing roads would be the dominant noise sources.

4.4 Noise Sensitive Receivers

4.4.1 In reference to the latest Outline Zoning Plans, Tseng Kwan O Outline Zoning Plan (S/TKO/15) dated 2 November 2004 and Cha Kwo Ling, Yau Tong, Lei Yue Mun Outline Zoning Plan (S/K15/15) dated 21 June 2002, existing and planned NSRs including domestic premises and educational institutions within the assessment area were identified following with the requirement of Annex 13 of the EIAO-TM. Photographs of all the identified existing NSRs are provided in Appendix 4.8. For the purpose of the noise assessment, a number of representative NSRs which were considered to be potentially worst-affected NSRs were selected for the assessment. The representative NSRs for construction and traffic noise assessments are summarised in Tables 4.5 and 4.6 below and their locations are illustrated in Figures 4.1 - 4.5.

4.4.2 Since there is no confirmed layout for some planned residential areas and educational institutes during the assessment, the locations of these representative planned NSRs would be in accordance with any site condition/restriction as stipulated in the OZP/Layout Plan. If not, these planned NSRs were assumed to be located at the 5m /10m from the site boundary or site boundary, which would be the nearest to the roads, as indicated points for assessment.

Table 4.5 Summary of Representative Existing/ Planned Noise Sensitive Receivers for Construction Noise Impact Assessment

NSR	Description		Type	Floor
Kowloon Area
CKL2		Existing Residential Development along Cha Kwo Ling Road	Residential	6/F
CP		Chung Pal House, Hong Pal Court	Residential	34/F
StA		St. Antonius Primary School and Kindergarten	Educational Institute	7/F
EHC1		Residential Development near Eastern Harbour Crossing (Under construction)	Residential	45/F
EHC2		Residential Development near Eastern Harbour Crossing (Under construction)	Residential	40/F
TKO Area
OSC2	Area 72 – Ocean Shores		Residential	48/F
OSC5	Area 72 – Ocean Shores		Residential	48/F
OSC7	Area 72 – Ocean Shores		Residential	48/F
TKC2	Area 57 – Park Central		Residential	48/F
TKC11	Area 57 – Park Central		Residential	48/F
66A3	Area 66 – Site 66A – Planned Residential Area (R1)		Residential	35/F
67S1	Area 67 – Planned School Area		Educational Institute	6/F
67S3	Area 67 – Planned School Area		Educational Institute	6/F
BAG1	Area 65A – Bauhinia Garden		Residential	41/F
BAG10	Area 65A – Bauhinia Garden		Residential	41/F
TKP4	Area 55 – Tseung Kwan O Plaza		Residential	45/F
OS7	Area 51 - Oscar By the Sea		Residential	57/F
65C2	Area 65 – Site 65C – Planned School Area		Educational Institute	5/F
65C3	Area 65 – Site 65C – Planned School Area		Educational Institute	5/F
N2	Area 86 – MTRC Area 86 Development (Under Construction)		Residential	50/F
N14	Area 86 – MTRC Area 86 Development (Under Construction)		Residential	42/F
N23	Area 86 – MTRC Area 86 Development		Residential	50/F
V1	Village House to the north of the Eastern Portal of WCR		Residential	2/F

Table 4.6 Summary of Identified Existing/ Planned Noise Sensitive Receivers for Traffic Noise Impact Assessment

NSR		Description	Type		Floor	Remarks
Kowloon Area
LC1		Laguna City	Residential		25/F	-
LC2		Laguna City	Residential		27/F	-
CKL1 – CKL2		Existing Residential Development along Cha Kwo Ling Road	Residential		6/F	-
H1 – H4		Private Residential Development to the north of WCR (Planned)	Residential		50/F	Locations are in accordance with the setback requirement of the land use
HS1 HS2		School Village of Kaolin Mine Site	Educational Institute		9/F	Building Layout based on MTR Tseung Kwan O Line Tseung Kwan of Area 86, Comprehensive Development Area submission under Section 16/4A Town Planning Ordinance – Environmental Assessment
HS3 – HS4		School Village of Kaolin Mine Site	Educational Institute		9/F
H10 – H11, H20		KMS Housing Development to the south of WCR (Planned)	Residential		28/F
H12 – H14		KMS Housing Development to the south of WCR (Planned)	Residential		40/F
H15 – H16		KMS Housing Development to the south of WCR (Planned)	Residential		20/F
H17 – H18		KMS Housing Development to the south of WCR (Planned)	Residential		36/F
H19 – H20		KMS Housing Development to the south of WCR (Planned)	Residential		32/F
T1		Tin Hau Temple to the south of KMS Development	Temple		1/F	-
EHC1		Residential Development near Eastern Harbour Crossing (Under Construction)	Residential		45/F	-
EHC2 – EHC3		Residential Development near Eastern Harbour Crossing (Under Construction)	Residential		40/F	-
EHC4 – EHC6		Residential Development near Eastern Harbour Crossing (Under Construction)	Residential		40/F	-
S1 – S3		CCC Kei Fat Primary School (Under Construction)	Educational Institute		6/F	Located at 5m from site boundary
StA		St. Antonius Primary School and Kindergarten	Educational Institutes		7/F	-
LP		Lung Pak House, Hong Pak Court	Residential		33/F	-
CP		Chung Pak House, Hong Pak Court	Residential		34/F	-
KH		SKH Kei Hau Secondary School	Educational Institute		6/F	-
SG1		Block 9, Sceneway Garden	Residential		28/F	-
PW		Ping Tin Estate	Residential		38/F	-
TKO Area
V1 – V3	Village Houses to the north of the Eastern Portal of WCR		Residential	2/F		-
N1 – N15	Area 86 – MTRC Area 86 Development next to CBL (Under Construction)		Residential	42/F – 57/F		Layout based on the Report of MTR Tseung Kwan O Line Tseung Kwan of Area 86, Comprehensive Development Area submission under Section 16/4A Town Planning Ordinance – Environmental Assessment
PS3	Area 86 – Combined Primary and Secondary School		Educational Institute	6/F
N16 – N22	Area 86 – MTRC Area 86 Development next to Road L861		Residential	50-57/F
PS1 – PS2	Area 86 – Planned Primary School next to Road L861		Educational Institute	6/F
78B1	Area 78 – Planned Residential Area (R3) (Site 78C)		Residential	8/F		Located at 10m from site boundary
78B2	Area 78 – Planned Residential Area (R3) (Site 78A)		Residential	6/F		Located at 10m from site boundary
78E1 – 78E6	Area 78 – Planned Residential Area (R3) and Education Area (Site 78E)		Residential	8/F		78E1 – Located at the boundary of 60m width sewage tunnel protection zone 78E2 to E6 – Located at 10m from site boundary
S1 - S2	Area 78 – Planned Residential Area (R3) and Education Area		Educational Institute	6/F		Located at 10m from site boundary
OS1 – OS6	Area 51 – Oscar By The Sea		Residential	40/F – 59/F		-
TKC1 – TKC12	Area 57 – Park Central		Residential	48/F		-
TKP1 – TKP5	Area 55 - Site 55A - Tseung Kwan O Plaza		Residential	45/F		-
55B1 – 55B3	Area 55 - Site 55B- The Grandiose		Residential	46/F		-
56A	Area 56 – Planned Commercial Development (might include residential)		OU	45/F		Locations are in accordance with the setback requirement of the OZP
BaG1 – BaG10	Area 65 - Site 65A – Bauhinia Garden		Residential	41/F		-
KG	Bauhinia Garden School		Educational Institute	2/F		-
65B1 – 65B3	Area 65 - Site 65B – Planned Residential Area (R2)		Residential	25/F		Located at site boundary/5m from site boundary
65C1 – 65C3	Area 65 - Site 65C – Planned School Area		Educational Institute	5/F		-
65C6	Tseung Kwan O Methodist Primary School		Educational Institute	6/F		-
65C7 – 65C9	Area 65 - Site 65C – Planned Other Specified Uses Area including Residential Uses		OU	20/F		Located at site boundary/5m from site boundary
66A1 – 66A4	Area 66 - Site 66A – Planned Residential Area (R1) (with 3storeys commercial development at lower levels)		Residential	35/F		Located at site boundary
66B1 – 66B5	Area 66 - Site 66B – Planned Residential Area (R1) (with 3storeys commercial development at lower levels)		Residential	35/F		Located at 5m from site boundary / boundary of breezeway
66C1 – 66C2	Area 66 - Site 66C – Planned Residential Area (R1) (with 3storeys commercial development at lower levels)		OU	20/F		Located at 5m from site boundary & boundary of breezeway
66D1 – 66D2	Area 66 - Site 66D – Planned Residential Area (R1) (with 3storeys commercial development at lower levels)		OU	20/F		Located at 5m from site boundary & boundary of breezeway
67S1 – 67S6	Area 67 – Planned School Area		Educational Institute	6/F		Located at site boundary /5m from site boundary
68A1 – 68A2	Area 68A – Planned Other Specified Uses Area including Residential Uses		OU	15/F		Located at site boundary
68B1	Area 68B – Planned Other Specified Uses Area including Residential Uses		OU	15/F		Located at site boundary
CTH & CYH	Area 74 N – Choi Ming Court		Residential	40/F & 20/F		-
POK	Area 74N – Po Kok Secondary School		Educational Institute	7/F		-
74S1 – 74S6	Area 74S – Planned School Area		Educational Institute	6/F		Located at 5m from site boundary
73Ba – 73Be	Area 73B – Ting Keng Leng Station Development at TKOTK 73, 73B (under construction)		Residential	57/F		-
73S1 – 73S2	Area 73B – Planned School Area		Educational Institute	6/F		-
73B1 – 73B6	Area 73B – Planned Residential Area (R1)		Residential	40/F		Layout provided by Housing Authority
OSC1 – OSC9	Area 72 – Ocean shores		Residential	47/F – 48/F		-

4.4.3 In order to evaluate the fixed noise impacts, the closest representative sensitive receivers in the vicinity of proposed ventilation buildings and pumping stations (Figure 4.5) were identified. The shortest distance between the ventilation buildings/ pumping stations and the representative NSRs are presented in Table 4.7.

Table 4.7 Summary of Selected Noise Sensitive Receivers for Fixed Noise Impact Assessment

Affected Fixed Noise Source	NSR	Description	Land Use	Closest Distance from the Source (m)
Western Ventilation Building	EHC1	Residential Development near Eastern Harbour Crossing	Residential	102
Eastern Ventilation Building	V1	Village Houses at North of Eastern Portal of WCR	Residential	124
Pumping Station at Road P2	OSC1	Area 72 - Ocean shores	Residential	106
Pumping Station near Area 86	N16	Area 86 - MTRC Area 86 Development	Residential	112
Pumping Station at Area 78	78E6	Area 78 Planned Residential Area	Residential	60

4.5 Assessment Methodology

Construction Noise

4.5.1 The Project is scheduled to commence in January 2008 and to be completed in January 2018 with all roads completed by December 2016. According to the construction programme, there are five major construction tasks (as shown in Appendix 2.1). Some individual tasks have different stages. Table 4.8 summarises the different tasks and phasing. All construction tasks would be carried out during unrestricted hours (0700 to 1900 hours Monday to Saturday excluding general holidays). The project proponent confirmed that the construction programme for proposed works are practical to be implemented.

Table 4.8 Summary of Construction Tasks and Stages for TKO Further Development

Item		Tasks and Stages	Construction Period	Main Construction Elements
1	TCS, TKL, PSK & TKOL Development
1.1		Local Roads and Engineering Infrastructure for TCS & TKL	January 2008 to January 2011	- Removal of Preloading Mound - Drains, Sewers, Waterworks, Utilities - Roadworks (Road L651, L661, L662, L671, L672, L673, L681, L721, L722)Box Culvert Realignment - Raising of Existing Seawall - Landing Steps - Piled Deck at Western Box Culvert - Landscape Works
1.2		Local Roads and Engineering Infrastructure for PSK	April 2008 to January 2011	- Site Formation - Drains, Sewers, Waterworks, Utilities - Roadworks (Road L781 & L782) - Junction J2 and J5 Improvement Works at Wan Po Road - Landscape Works - Site Formation for Service Reservoir - Reservoir & Pumping Station Construction - Distribution Main Laying for Service Reservoir - Access Road Construction for Reservoir
1.3		Engineering Infrastructure for TKOL	November 2008 to December 2010	- Northern Cycletrack Footbridge and Southern Footbridge across EC - Sewage Pumping Station for TKOL - Sewage Rising Mains and Waterworks along Road L861 - Cycletrack and Footpath along TKOL
2	Western Coast Road
2.1		Reclamation and Associated Works (Contract 1)	November 2010 to August 2011	- Reclamation Phase 1 Deep Cement Mixing Trial
2.2		Reclamation & Associated Works (Contract 2)	February 2012 to April 2016	- Reclamation Phase 2 & 3 - Toll Plaza and At-grade Roads
2.3		Main Tunnel and Associated Works	September 2011 to November 2015	- Excavation Works at Tunnel Portal - Tunnel Excavation (Drill & Blast) - Mid-ventilation Building - Utilities and Drainage Works - Ventilation and E&M Works - Roadworks and Signage
2.4		Kowloon Section – Viaducts and Roads	June 2011 to January 2017	Section between Western Portal and Road A: - Excavation at Tunnel Portal - Ambulance Depot Construction - Foundation works for bridge abutment and piers - Bridge Deck Construction - At-grade Road Construction - Roadworks and Signage - Noise barrier / Enclosure Installation Section between Road A and VFP: - Excavation Works - Cut and Cover Tunnel - Piling Works - Pile Caps, Columns, Abutment Construction - Bridge Deck Construction - Drainage and Utilities Works - Roadworks and Signage - Noise Barrier / Enclosure Installation
3	Cross Bay Link
3.1		Viaduct Section (Bridge A, B and C)	February 2013 to September 2015	- Piling Works - Pile Cap and Columns - Bridge Deck - Roadworks, Waterworks and Signage
3.2		Cable-stayed bridge section	June 2013 to December 2016	- Pylon Piling Works - Pile Cap and Pylon Construction - Protection Dophins Construction - Bridge Deck and Cable Construction - Roadworks and Signage
3.3		Road Section along Area 86	June 2014 to January 2018	- Drainage, waterworks and utilities works - Roadworks and signage - Noise barrier installation - Laying of 300mm diameter Watermain along Wan Po Road
3.4		WCR/ CBL/ Road P2 Interchange	May 2014 to December 2016	- Piling Works - Pile Cap and Column Construction - Bridge Deck Construction - Drainage, Waterworks, Utilities - Roadworks and Signage - Natural Terrain Mitigation Works - Landscape Works
4	Road P2 & D4 Flyover
4.1		Road P2 and Associated Works – Bridge Section	March 2013 to November 2016	- Piling Works, Pile Cap and Column Construction - Bridge Deck Construction - Drainage, Waterworks and Utilities works - Roadworks and Noise Barrier Installation - Landscape Works
4.2		Road P2 and Associated Works – Depressed Section	March 2016 to December 2016	- Diaphragm Wall - Piling Works - Walls and Slab Construction - Decking Construction - Pumping Station Construction - Drainage, waterworks, utilities works - Roadworks
4.3		Road P2 and Associated Works – At-grade Section	June 2014 to June 2016	- Drainage, waterworks and utilities works - Roadworks - Landscape Works

4.5.2 The methodology outlined in the GW-TM has been used for the assessment of construction noise (excluding percussive piling). Powered Mechanical Equipment (PMEs) used for the different construction tasks and the on-time percentage of PME of each PME (the time when PME is in operation with a 30 minutes time slot) opined by the engineer is presented in Appendix 4.1. The plant inventory has been confirmed as being practicable for completing the works within the scheduled timeframe. Sound Power Levels (SWLs) of the equipment were taken from Table 3 of the GW-TM. Where no SWL is supplied in the GW-TM, reference was made to BS 5228, previous similar studies or from measurements taken at other sites in Hong Kong.

4.5.3 It was assumed that all PME items required for a particular construction activity were located at the notional or probable source position of the segment where such activity was performed. The assessment was based on the cumulative SWL of PME likely to be used for each location, taking into account the construction period in the vicinity of the receiver location. To predict the noise level, PME was divided into groups required for each discrete construction task. The objective was to identify the worst-case scenario representing those items of PME that would be in use concurrently at any given time. The sound pressure level of each construction task was calculated, depending on the number of plant, their on-time percentage of operation and their distance from receivers. The noise levels at NSRs were then predicted by adding up the SWLs of all concurrent construction tasks.

4.5.4 A positive 3 dB(A) façade correction was added to the predicted noise levels in order to account for the facade effect at each NSR.

4.5.5 The construction noise assessment was carried out for quarterly intervals starting from the commencement of the Project. The construction tasks of the Project taking place concurrently within 300 m of a given NSR were considered to contribute to the cumulative impact at that NSR. The minimum distances from the notional source points of each construction activity to the representative NSRs are given in Appendix 4.1.

4.5.6 In order to prevent adverse noise impacts on educational institutes (including NSRs StA, 65C2, 65C3 and 67S3) in the vicinity of the construction sites, construction sequences of some construction activities, the number of PMEs concurrently in operation, and the on-time percentage of operation of PMEs would be scheduled to limit impacts especially during examination periods. The detailed arrangement is presented in Appendix 4.1. The Project Proponent has confirmed that these arrangements are practicable and feasible in the context of the construction programme and method.

4.5.7 There is no other project to be constructed concurrently within the study area of this Project.

Operational Phase – Road Traffic Noise

4.5.8 Traffic noise was predicted using the methodology provided in the UK Department of Transport Calculation of Road Traffic Noise (CRTN) 1988. According to the EIA Study Brief and Annex 13 of the EIAO-TM, the road traffic noise were calculated based on the maximum traffic forecast within 15 years period upon operation of the proposed roadwork or occupation of the NSRs or uses.

4.5.9 The proposed development at TCS, PSK and the remaining area of TKL would be in full occupation in 2011, while the proposed WCR, CBL, Road P2 and its associated works would be in operation in 2016. The proposed development at Pak Shing Kok, Area 51, 55A, 55B, 65A, 65B, 65C and 68B, and the proposed residential blocks in Area 86 near Road L861 would not be affected by the proposed WCR, CBL and Road P2, whereas they would be mainly affected by the existing Wan Po Road, eastern section of Road D4 (Po Yap Road) or the proposed Road L861. Since projected peak hour traffic flows along Wan Po Road, eastern section of Road D4 and Road L861 in year 2016 (before the operation of WCR, CBL and Road P2) would be the maximum traffic forecast within 15 years period upon occupation of the NSRs or uses, traffic forecast in year 2016 was adopted for the traffic noise impact assessment for these developments. For WCR, CBL and Road P2, projected peak hour traffic flows in year 2031 would be the maximum traffic forecast during the period from 2016 to 2031. Hence, traffic forecast in year 2031 was adopted for assessing the traffic noise impacts on the nearby sensitive receivers/uses from these proposed new roads. The traffic data for years 2016 and 2031 were endorsed by Transport Department (see Appendix 4.2). The assessment scenarios for traffic noise assessment are as follows:

(i) Year 2016 Traffic Flow – TKO Area including TKO Areas 51, 55A, 55B, 65A, 65B, 65C, 68B, Pak Shing Kok Area 78 and MTRC Development Area 86 near Road L861;

(ii) Year 2031 Traffic Flow – Kowloon Area including Laguna City, Kaolin Mine Housing Site to the north and south of WCR, EHC Housing Site and representative NSRs in vicinity of western portal of WCR;

(iii) Year 2031 Traffic Flow – TKO Area including NSRs in vicinity of CBL, WCR and Road P2 in TKO areas including village houses to the north of the Eastern Portal of the WCR, Areas 56, 57, 66A, 66B, 66C, 66D, 67, 68A, 72A, 73B, 74N, 74S and 86 in vicinity of CBL.

4.5.10 Since traffic flows along the major roads during the peak hour in the morning session are generally higher than that in the afternoon session, the morning peak hour traffic flows were used for modelling. The projected 2016 and 2031 AM peak hour traffic flows are presented in Appendix 4.2.

4.5.11 The following traffic speeds for the proposed Trunk Road system (based on the Design Memorandum) have been adopted:

Road Speed Limit

WCR/Road P2/Cross Bay Link 80 km per hour

Road D4 & L781 & L861/Proposed Local Roads 50 km per hour

4.5.12 The traffic speed for all existing roads was assumed to be 50 km per hour, except Wan Po Road which was assumed to be 70 km per hour. Porous friction courses (low-noise road surfacing materials) were assumed for WCR, Road P2 and CBL as standard design of high speed road (80 km/hr or higher). The locations of low noise surfacing area on existing/planned roads according to the recommendations from previous studies and proposed WCR, Road P2 and CBL, which were considered in the unmitigated scenario, are shown in Appendix 4.3.

4.5.13 The road network, proposed building layout and all other features that could have noise screening or reflective effects, were digitised in the road traffic noise model. The roads were divided into segments, each of which was assigned a road layout number. A road layout defined the road width, opposing traffic lane separation, road surface type and traffic mix, flow and road design speed. Hard ground as defined in CRTN was assumed throughout the Study Area. Noise levels were calculated at each receiver point at three different elevations (that is, 1st floor, mid-floor and top floor). Samples of model listing files are included in Appendices 4.11 and 4.12. Taking into account of average height of most buildings/development at Kowloon and TKO sides, The traffic noise contours at 5m (1/F), 60m (mid floor) and 116m (top floor) above ground level, were plotted for unmitigated and mitigated scenarios.

4.5.14 Roads within 300m from the boundary of the proposed developments/new roads are included in the assessment. The planned government buildings at Area 65B and 72, the planned school at Area 74S are also included in the traffic model as screening structure. Its heights are in accordance with the requirement as stipulated in TKO Recommended Outline Zoning Plans (Draft) No. S/TKO/15(1). Referring to the engineering design, two landscape decks over Road P2 (as shown in Figure 2.32) are proposed and are considered in the unmitigated scenario.

Operational Phase - Ventilation Shaft and Pumping System Noise

4.5.15 Three ventilation buildings for the Western Coast Road, namely Eastern Portal Ventilation Building, Mid-Ventilation Building and Western Portal Ventilation Building, are proposed to maintain the air quality within the WCR tunnel to meet the EPD air quality guideline. Three pumping stations are proposed at Road P2, Area 78 and near Area 86. The locations of the fixed noise sources and the representative NSRs are shown in Figure 4.5.

4.5.16 Potential impacts from these installations, including noise from ventilation buildings with exhaust fans and underground pumping stations with pumping sets, can be expected. The fixed noise impacts were assessed in accordance with the IND-TM. It has been assumed in the assessment that all duty exhaust fans at each ventilation building and powered mechanical equipment at the pumping stations is in operation. Screening corrections from other buildings/ structures and directivity were not included in the assessment. As all proposed pumping stations would be located underground, and the representative NSRs have no direct line of sight to the pump sets, noise attenuation of 20 dB(A) would be expected for the noise emitted from the pump sets.

4.5.17 According to the preliminary design information provided by the Engineer, the type and number of exhaust fans/pumps to be installed at the ventilation buildings/pumping stations are summarised in Table 4.9. As there is no specification of equipments provided in this preliminary design stage, the sound power levels of the ventilation fans/pumps would make reference to the data stipulated in Good Practices on Ventilation System Noise Control and Good Practices on Pumping System Noise Control published by EPD.

Table 4.9 Summary of Equipments Installed at Ventilation Building and Pumping Station

Fixed Noise Source	Equipment	Nos	Sound Power Level of each equipment #, dB(A)
Western Portal Ventilation Building	77m^3/s Reversible Axial Fans	3 duty + 1 standby	89
Eastern Portal Ventilation Building	77m^3/s Reverse Axial Fans	3 duty + 1 standby	89
	85m^3/s Reversible Fans	4 duty	89
	107 m^3/s fans	3 duty + 1 standby	90
Pumping Station at Road P2	Submersible pumps at 1800 rpm	2	100
Pumping Station near Area 86	Submersible pumps at 1800 rpm	2	100
Pumping Station at Area 78	Submersible pumps at 1800 rpm	2	100

Note: # The higher sound power levels to be adopted in the assessment if no similar one or no detailed design information provided.

4.5.18 Due to the facade effect, a positive 3 dB(A) has been added to predict noise levels at the NSRs. The distances attenuation was calculated using the following equation.

C_dist = -20log r – 8

Where:

C_dist : Influence factor for Distance Attenuation

r : Distance between the noise source and the NSR

4.6 Overview of Relevant Studies

4.6.1 Various EIA and planning studies have been conducted within the Project study area (Kowloon side and TKO side). The recommendations from these studies were reviewed whether the proposed mitigation measures still be valid to this Project and formed the basis for this assessment. The following was an overview of previous studies together with the findings and recommendations.

Kowloon Area

Feasibility Study for Development at CKL Kaolin Mine Site – Final Environmental Impact Assessment Report Proposed Development & Final Environmental Impact Assessment Report Proposed Road A Connecting Sin Fat Road and Cha Kwo Ling Road

4.6.2 Both captioned studies were administrative studies and completed in July 2003 and the following noise mitigation measures were proposed on Road A. The locations of the noise barriers at Road A are shown in Figure 4.6b.

· CNB-A: approx. 175 m long cantilevered barrier with 7 m effective height along northbound of Road A, located at 3 m from kerbside.

· CNB-B: approx. 121 m long cantilevered barrier with 6.5 m effective height along northbound of Road A, located at 2 m from kerbside.

· CNB-C: approx. 42 m long cantilevered barrier with 6.5 m effective height along northbound of Road A, located at 1 m from kerbside.

· ENB-A: approx. 40 m long cantilevered barrier with 7 m effective height along northbound of Road A, located at 2 m from kerbside.

· ENB-B: approx. 89 m long cantilevered barrier with 7 m effective height along northbound of Road A, located at 6 m from inner kerb of bus bay.

· ENB-C: approx. 50 m long cantilevered barrier with 7 m effective height along northbound of Road A, located at 2 m from kerbside.

4.6.3 The proposed noise mitigation measures on Road A were all incorporated in the assessment of this Project in the unmitigated scenario.

Public Housing Development at EHC Sites Phases 1, 2 & 3 Environmental Assessment Study – Final Report

4.6.4 The above report was issued in January 2003. A series of noise mitigation measures as following were proposed along the boundary of Phases 1 & 2 sites. The construction work for EHC Site Phase 1 has been completed now and the works for Phases 2 & 3 are still pending. In this assessment, the layouts for Phases 2 and 3 in the captioned report were considered still valid and the proposed noise mitigation measures as shown in Figure 4.6c were all considered in the unmitigated scenario.

· 6m high barrier with 3m cantilever length along the site boundary of EHC Site Phase 1

· 8m vertical barrier along the site boundary of EHC Site Phase 1

· 6m high barrier with 3m cantilever length above ARCS at ECH Site Phase 1

· 15m high vertical barrier along site boundary of EHC Site Phase 2

· 8m high barrier with 8m cantilever length along the site boundary of EHC Site Phase 2

TKO Area

TKO Development Contract No. TK43/96 Widening and Improvements of Wan Po Road – Environmental Impact Assessment

4.6.5 Widening of Wan Po Road EIA Study was completed in June 1997. Low noise road surfacing was recommended on the section of Wan Po Road from road junction near Areas 50 & 51 and road junctions of Road D6/Wan Po Road. This mitigation measure has been applied on the concerned road section and considered in the unmitigated scenario. The locations are indicated in Appendix 4.3.

Tseung Kwan O Development Contract No. TK42/96, Engineering Infrastructure in Tseug Kwan O Town Centre Central – Environmental Impact Assessment

4.6.6 This study was completed in September 1997. This study recommended that (i) Two sections of deck-over on Road D4 near Area 57 & Area 55; (ii) low road noise surfacing on section of at-grade Road P2 from Tong Ling Street to road junction of Road P2/D4; and (iii) 2m plain noise barrier along the edges of the Road P2 flyover to the south of roundabout on Road P2.

4.6.7 Traffic forecast on the Project study area was carried out based on the latest engineering information and layout plan. It was found that there was an obvious decrease in heavy vehicle percentage in traffic flow on Road D4 comparing with the traffic forecast for the above EIA Report due to the diversion of traffic to Cross Bay Link. The above proposed deckovers were considered not applicable in this Study and new mitigation measures would be proposed if necessary. The proposed low road noise surfacing on section of at-grade Road P2 from Tong Ling Street to road junction of Road P2/D4 was still applied in unmitigated scenario of the traffic noise assessment.

EIA of Public Roads at Tiu Keng Leng – Final Report

4.6.8 This planning study was completed in 1998. This EIA study assessed the impacts arising from the construction and operation of Roads D4, D8. L731 and L732 at Tiu Keng Leng on the nearby developments Areas 57, 59, 67, 72, 73A, Area 73B and Area 74. The study recommended the practical noise mitigation measures including (i) 5m cantilever barrier with a 3m overhang on Road D8 between Area 73B and Area 74S; (ii) 5m cantilever barrier with a 3m overhang on the eastbound at-grade section of Road D4; (iii) a 5m roadside barrier on the southbound section of Road D8 (south of Road D4) between Area 72 (east) and Area 72 (Ocean Shore); and (iv) a 5m barrier with a 3m cantilever section on Road D4 Flyover (near Area 74S).

4.6.9 Based on the latest layout in this Project, the land use of Area 74S was changed from residential site to education institute and park. The land use of Area 72 (east) was changed from educational institute to park. Therefore, the above proposed noise mitigation measures were not applicable in this Project.

Feasibility Study for Intensification and Extension of Tseung Kwan O – Environmental Impact Assessment

4.6.10 This EIA study was completed in 2001. The study recommended a series of noise mitigation measures on Roads P2, D1, D8 and D9. A minimum setback distance of 72m was also proposed for the building blocks at Pak Shing Kok closest to the junction of Wan Po Road and Road D6.

4.6.11 Based on the latest road layout of this Project, there is no Roads D1 and D8, and the road layouts of Roads P2 and D9 were also revised. The proposed noise mitigation measures in the captioned report are not feasible to be adopted in this Project. Regarding Pak Shing Kok Development, the previous study has a much higher development plot ratio and higher height of building block than the current proposed under this Project, the recommended minimum setback distance of 72m for the Pak Shing Kok development was considered invalid in the assessment of this Project.

Environmental Impact Assessment for Roads D1, D8 and D10

4.6.12 This study was completed in August 2001. The EIA study recommended noise mitigation measures on Roads D1, D8 and D10. Due to the change of road network based on the latest information, the proposed noise mitigation measures were not valid and would not be adopted in this Project.

MTR Tseung Kwan O Line Tseung Kwan of Area 86, Comprehensive Development Area submission under Section 16/4A Town Planning Ordinance – Environmental Assessment

4.6.13 The captioned planning report was submitted under Section 16/4a Town Planning Ordinance in June 2004, the following noise mitigation measures were proposed in their building layout so as to alleviate the traffic noise impacts from CBL. These measures have been considered in the unmitigated assessment and its locations are shown in Figure 4.7e & 4.7f.

· C1: A 140m long cantilevered barrier (8 m high vertical barrier with 5 m cantilever at 45° to the horizontal), located at the site boundary near road junction Wan Po Road and Road D9

· C2: A noise canopy at 20mPD with 13.8 m cantilever at 12.5° to the horizontal located at the site boundary near CBL.

· C3: A noise canopy at 29mPD with 13.8 m cantilever at 12.5° to the horizontal located at the site boundary near CBL.

· C4: A noise canopy at 26mPD with 13.8 m cantilever at 12.5° to the horizontal located at the site boundary near CBL.

4.6.14 The recommendations in the previous studies to be adopted or not in the assessment (To be considered in unmitigated scenario) for this Project are summarised as follows.

Previous Studies	Studies available at the Register of EIA Ordinance	Noise Mitigation Measures adopted in the assessment
Feasibility Study for Development at CKL Kaolin Mine Site – Final Environmental Impact Assessment Report Proposed Development & Final Environmental Impact Assessment Report Proposed Road A Connecting Sin Fat Road and Cha Kwo Ling Road	No	Yes
Public Housing Development at EHC Site Phases 1, 2 & 3 – Final EAS Report	No	Yes
Tseung Kwan O Development Contract No. TK42/96, Engineering Infrastructure in Tseug Kwan O Town Centre Central – Environmental Impact Assessment	Yes (EIA-122-BC)	Yes
Tseung Kwan O Development Contract No. TK42/96, Engineering Infrastructure in Tseun Kwan O Town Centre Central – Environmental Impact Assessment	Yes (EIA-123/BC)	No, except low noise surfacing on Road P2.
EIA of Public Roads at Tiu Keng Leng – Final Report	Yes (EIA-146/BC)	No
Feasibility Study for Intensification and Extension of Tseung Kwan O – Environmental Impact Assessment	No	No
Environmental Impact Assessment for Roads D1, D8 and D10	Yes (EIA-061/2001)	No
MTR Tseung Kwan O Line Tseung Kwan of Area 86, Comprehensive Development Area submission under Section 16/4A Town Planning Ordinance – Environmental Assessment	No	Yes

4.7 Identification of Environmental Impacts

Construction Phase

4.7.1 The scope of this Project includes reclamation along the western TKO shoreline; construction of a tunnel for WCR; construction of CBL, and extension of Road P2 and associated connecting roads and local access roads. Based on the construction programme, potential construction noise impacts of the Project may arise from the following major construction activities:

· Dredging works and seawall construction, involving barges, tug boats and dredgers.

· Filling, involving barges, tugs and compaction activities.

· Road and road pavement formation and associated earthworks.

· Tunnel construction.

· Drainage culvert construction.

· Reprovisioning of infrastructure, services and utilities.

4.7.2 Construction works would be expected to be carried out in non-restricted hours (0700-1900). According to the current engineering information, bored piling would be used under the Project and this assumption was considered in the construction noise impact assessment of this Study. If the Contractors in future use percussive piling for some construction works, Construction Noise Permit should be obtained from the Noise Control Authority prior to commencement of the works.

4.7.3 As mentioned in Section 2, drill and blast method would be adopted for the tunnelling works. The hand-held drillers would be used to make holes for installation of dynamite and this activity for tunnel works have been taken into account in the construction noise calculation. According to the information provided by the Engineer, there will be not more than three times of blasting per day for the tunnel construction. The construction period of the drill-&-blast tunnels would be about 18 months. All the detonation will be conducted underground within the tunnels. As blasting is under the control of the Dangerous Goods Ordinance, the contractor shall obtain a valid blasting permit from the Mines Division of CEDD before carrying out the blasting. The contractor shall enclose a method statement including manner of working and protective measures to protect adjacent land and property when blasting is carried out. The distance between the closest NSR (Cheung Pak House, Hong Pak Court) and the tunnel section would be greater than 50m. It is noted that each blast would last for a few seconds.

Operational Phase

4.7.4 Operational phase impacts would arise from the following operations:

· Road traffic noise.

· Ventilation shaft noise from WCR ventilation buildings.

· Noise from pumping stations.

4.7.5 Road traffic noise would arise from "new" roads constructed under the Project as well as cumulative traffic noise from the new and existing roads.

4.8 Prediction and Evaluation of Environmental Impacts

Construction Noise

4.8.1 For normal daytime working hours, exceedance of the construction noise criteria (Leq (30 minutes) 75 dB(A) for residential uses and 70 dB(A) for places where unaided voice communication is required were predicted at representative NSRs in the absence of mitigation measures for different construction stages. Details of construction noise calculations and results are presented in Appendix 4.1. The results show that the predicted noise levels related to the construction works of TKO further development at representative NSRs are in the range of 62 to 90 dB(A). Table 4.10 summarises the unmitigated construction noise levels of the representative NSRs during normal daytime working hours within the construction period of TKO further development. Noise mitigation measures would therefore be required to reduce the noise levels to the stipulated standards.

Table 4.10 Unmitigated Construction Noise Levels at Representative NSRs

Representative NSRs	Type of NSRs	Noise Criteria for the NSRs during normal working hours (dB(A))	Predicted unmitigated construction noise levels during normal daytime working hours (dB(A))
OSC2	Residential	75	70 - 88
OSC5	Residential	75	70 - 83
OSC7	Residential	75	69 - 84
TKC2	Residential	75	75 - 86
TKC11	Residential	75	72 - 82
66A3	Residential	75	68 - 85
67S1	School	70 / 65 *	64 - 75
67S3	School	70 / 65 *	73 - 87
BAG1	Residential	75	77 - 88
BAG10	Residential	75	72 - 81
TKP4	Residential	75	66 - 75
OS7	Residential	75	63 - 81
65C2	School	70 / 65 *	67 - 93
65C3	School	70 / 65 *	72 - 89
N2	Residential	75	71 - 83
N14	Residential	75	71 - 77
N23	Residential	75	71 - 88
V1	Residential	75	66 - 80
CKL2	Residential	75	62 - 86
CP	Residential	75	65 - 83
StA	School	70 / 65 *	67 - 7980
EHC1	Residential	75	78 - 89
EHC2	Residential	75	74 - 89

* The construction noise criteria for school during examination periods is 65 dB(A)

Operation Noise – Road Traffic Noise

4.8.2 Traffic noise levels have been predicted at representative NSRs including existing and planned residential dwellings, and educational institutes in Kowloon and TKO study areas. The noise mitigation measures as recommended in previous studies were reviewed in Section 4.6. The identified valid mitigation measures from previous studies were considered in the unmitigated scenario. The setback distance assumptions for the planned NSRs as stipulated in Table 4.6 were also considered in the unmitigated scenario. It was agreed that PlanD would implement the setback requirements.

4.8.3 The predicted unmitigated results in Years 2016 & 2031 are discussed in the following paragraphs. The detailed results are presented in Appendices 4.6 and 4.7. The unmitigated noise contours are presented in Figures 4.8 – 4.13.

Year 2016 Traffic Flow – TKO Area

4.8.4 Assessment has been conducted for TKO Town Centre including Areas 51, 55A, 55B, 65A, 65B, 65C, 68B, Pak Shing Kwok Area 78 and MTRC Development Area 86 near Road L861, to evaluate the potential traffic noise impacts based on Year 2016 traffic flow forecast. The results are summarised in Table 4.11 and are discussed in the following paragraphs.

Table 4.11 Unmitigated Traffic Noise Levels at Representative NSRs in TKO Area in Year 2016

			Noise	Predicted Noise
Area	Type	NSR ID	Limit, dB(A)	Level, dB(A)
Area 51	Residential (Existing)	OS1	70	48 - 64
		OS2	70	49 - 63
		OS3	70	57 - 62
		OS4	70	60 - 62
		OS5	70	60 - 61
		OS6	70	60 - 61
Area 55A	Residential (Existing)	TKP1	70	63 - 66
		TKP2	70	61 - 67
		TKP3	70	60 - 67
		TKP4	70	62 - 67
		TKP5	70	68 - 70
Area 55B	Residential (Under	55B1	70	61 - 66
(The Grandiose)	Construction)	55B2	70	58 - 66
		55B3	70	66 - 69
Area 65A	Residential (Existing)	BaG1	70	60 - 66
		BaG2	70	56 - 66
		BaG3	70	61 - 65
		BaG4	70	63 - 67
		BaG5	70	50 - 64
		BaG6	70	47 - 65
		BaG7	70	59 - 65
		BaG8	70	61 - 62
		BaG9	70	61 - 62
		BaG10	70	63 - 64
	Educational Institute (Existing)	KG	65	45 - 49
Area 65B	Residential (Planned)	65B1	70	60 - 65
		65B2	70	66 - 72
		65B3	70	66 - 71
Area 65C	Educational Institute (Planned)	65C1	65	70 - 72
		65C2	65	69 - 70
		65C3	65	69 - 69
		65C4	65	65 - 65
	Educational Institute (Existing)	65C6	65	65 - 65
	Residential (Planned)	65C7	70	66 - 72
		65C8	70	59 - 61
		65C9	70	56 - 59
Area 68B	Residential (Planned)	68B1	70	55 - 57
Area 78	Residential (Planned)	78B1	70	65 - 67
		78B2	70	62 - 62
		78E1a	70	64 - 74 (at 10m SB)
		78E1b	70	62 - 74 (at 20m SB)
		78E2a	70	72 - 75 (at 10m SB)
		78E2b	70	67 - 75 (at 20m SB)
		78E2c	70	64 - 74 (at 10m SB)
		78E2d	70	62 - 73 (at 10m SB)
		78E3a	70	72 - 75 (at 10m SB)
		78E3b	70	68 - 75 (at 20m SB)
		78E3c	70	66 - 74 (at 30m SB)
		78E3d	70	63 - 74 (at 40m SB)
		78E3e	70	61 - 73 (at 50m SB)
		78E4a	70	69 - 71 (at 10m SB)
		78E4b	70	66 - 70 (at 20m SB)
		78E5	70	66 - 70 (at 10m SB)
		78E6	70	68 - 70 (at 10m SB)
	Educational Institute (Planned)	S1	65	42 - 47
		S2	65	44 - 51
Area 86	Residential (Planned)	N16	70	67 - 72
		N17	70	67 - 71
		N18	70	68 - 71
		N19	70	68 - 71
		N20	70	68 - 72
		N21	70	68 - 72
		N22	70	70 - 74
	Educational Institute (Planned)	PS1	65	76 - 77
		PS2	65	66 - 70

Note: 10m SB is 10m Setback Distance from Site Boundary

Noise `Sensitive Receivers at Area 51

4.8.5 Assessment results indicate that the predicted noise levels at Oscar by the Sea would comply with the relevant traffic noise criterion.

Noise Sensitive Receivers at Area 55A & 55B

4.8.6 The predicted noise levels of representative sensitive facades facing Po Yap Road including TKO Plaza Phases and The Grandiose at Area 55, would comply with relevant noise criteria, therefore, mitigation measures would not be required.

Noise Sensitive Receivers at Area 65A, 65B &65C

4.8.7 The sensitive facades at Area 65A (Bauhinia Garden) would comply with the traffic noise criterion.

4.8.8 For Area 65B, minor exceedance of 1-2 dB(A) would be predicted at two indicative assessment points at the lower floors due to proposed ‘new’ roads. Mitigation measures would be required.

4.8.9 Predicted noise levels at some planned school facades and planned residential receivers in Area 65C would exceed the relevant noise criteria. Appropriate noise mitigation measures would be necessary.

Noise Sensitive Receivers at Area 68B

4.8.10 The results indicate that the predicted noise levels at NSR 68B1 would comply with the relevant traffic noise criterion.

Area 78 - Pak Shing Kok

4.8.11 Noise levels of up to 5 dB(A) above the relevant criterion are predicted at some residential facades at Pak Shing Kok facing Wan Po Road and the road junction of Wan Po Road and Road L781. Mitigation measures would therefore be required.

Area 86 near Road L861

4.8.12 Noise levels of up to 4 dB(A) above the relevant criterion are predicted at residential facades NSR N22 at Area 86 MTRC Development due to Road L861. Exceedances were predicted at the school facades, however, the noise levels mainly contributed from existing Wan Po Road.

Year 2031 Traffic Flow - Kowloon Area

4.8.13 Assessment has been conducted for Kowloon Area including Laguna City, Kaolin Mine Housing Site to the north and south of WCR, EHC Housing Site and representative NSRs in vicinity of western portal of WCR to evaluate the potential traffic noise impacts based on Year 2031 traffic flow forecast. The results are summarised in Table 4.12 and are discussed in the following paragraphs.

Laguna City & NSRs along Cha Kwo Ling Road

4.8.14 Exceedances of the noise criteria were predicted at Laguna City and other existing developments at Cha Kwo Ling Road. The breakdown of the overall noise levels indicates that the noise exceedances would be attributable to the existing roads and the noise contribution form ‘new’ roads to total noise level would be less than 1 dB(A). Hence, direct noise mitigation measures on the WCR would not be effective in improving the noise environment at the sensitive receivers.

Kaolin Mine Site Development, EHC Site & Noise Sensitive Receivers in vicinity of WCR

4.8.15 Exceedances of the noise criteria, predominantly due to the proposed ‘new’ roads, were predicted at most of the planned private residential developments to the north of the WCR, at the Kaolin Mine Site (KMS) Housing Development to the south of the WCR, at the Tin Hau Temple, at some school facades at KMS and at residential development near the Eastern Harbour Crossing. Direct noise mitigation measures are therefore necessary to alleviate the impacts.

4.8.16 The predicted noise levels at CCC Kei Fat Primary School, St. Antonius Primary School and Kindergarten, Sceneway Garden, Ping Tin Estate and SKH Kei Hau Secondary School would exceed the traffic noise criteria, however, the predicted exceedances would be predominantly due to noise from existing roads. The noise levels arising from the proposed ‘new’ roads would be less than 70 dB(A) for residential development/65 dB(A) for educational institute and their contribution to the overall noise levels would be less than 1.0 dB(A). Therefore, direct noise mitigation measures on the new road would not be required.

4.8.17 Exceedances of the noise criteria were predicated at Chung Pak House and Lung Pak House of Hong Pak Court due to traffic noise from both existing roads and new roads. Mitigation measures would therefore be required on the new roads.

Table 4.12 Unmitigated Traffic Noise Levels at Representative NSRs in Kowloon Area in Year 2031

NSR	NSR ID	Noise	Predicted Noise Level
		Limit
		dB(A)	dB(A)
Laguna City	LC1	70	73 - 75
	LC2	70	69 - 72
Existing Residential Development	CKL1	70	76 - 77
along Cha Kwo Ling Road	CKL2	70	78 - 81
Private Residential Development	H1	70	72 - 75
at the North of WCR	H2	70	69 - 74
	H3	70	65 - 74
	H4	70	65 - 74
KMS Housing Development at	H10	70	74 - 77
the South of WCR	H11	70	73 - 76
	H12	70	70 - 74
	H13	70	72 - 74
	H14	70	68 - 74
	H15	70	68 - 72
	H16	70	69 - 70
	H17	70	66 - 72
	H18	70	65 - 72
	H19	70	64 - 72
	H20	70	69 - 74
Cha Kwo Ling Tin Hau Temple	T1	65	75 - 7575
Residential Development	EHC1	70	65 - 80
near Eastern Harbour Crossing	EHC2	70	62 - 81
	EHC3	70	65 - 76
	EHC4	70	65 - 78
	EHC5	70	63 - 80
	EHC6	70	63 - 77
	EHC7	70	65 - 77
CCC Kei Fat Primary School	S1	65	76 - 77
	S2	65	76 - 76
	S3	65	74 - 75
School Development	HS1	65	67 - 71
at the North of WCR	HS2	65	65 - 68
	HS3	65	67 - 68
	HS4	65	71 - 72
St.Antonius Pri. Sch. and Kindergarten	StA	65	67 - 69
Sceneway Garden	SG1	70	74 - 76
Ping Tin Estate	PW	70	71 - 74
Hong Pak Court	CP	70	68 - 71
Lung Pak House	LP	70	65 - 70
SKH Kei Hau Sec.Sch.	KH	65	79 - 79

Year 2031 Traffic Flow - TKO Areas

4.8.18 Assessment has been conducted for NSRs in vicinity of CBL, WCR and Road P2 in TKO areas including village houses to the north of the Eastern Portal of the WCR, Areas 56, 57, 66A, 66B, 66C, 66D, 67, 68A, 72A, 73B, 74N, 74S and 86 in vicinity of CBL based on Year 2031 traffic flow forecast. The results are summarised in Table 4.13 and are discussed in the following paragraphs.

Table 4.13 Unmitigated Traffic Noise Levels at Representative NSRs in TKO Area in Year 2031

			Noise	Predicted Noise Level,
Area	Type	NSR ID	Limit, dB(A)	dB(A)
Village Houses	Residential (Existing)	V1	70	70 - 70
at North of Eastern		V2	70	69 - 70
Portal of WCR		V3	70	57 - 62
Area 56A	Residential (Planned)	56A	70	56 - 65
Area 57	Residential (Existing)	TKC1	70	68 - 71
		TKC2	70	68 - 71
		TKC3	70	66 - 69
		TKC4	70	67 - 70
		TKC5	70	66 - 69
		TKC6	70	66 - 70
		TKC7	70	66 - 69
		TKC8	70	66 - 69
		TKC9	70	66 - 69
		TKC10	70	65 - 69
		TKC11	70	66 - 69
		TKC12	70	66 - 69
Area 66A	Residential (Planned)	66A1	70	65 - 69
		66A2	70	65 - 70
		66A3	70	65 - 67
		66A4	70	63 - 65
Area 66B	Residential (Planned)	66B1	70	65 - 69
		66B2	70	63 - 69
		66B3	70	62 - 70
		66B4	70	62 - 70
		66B5	70	64 - 68
Area 66C	Residential (Planned)	66C1	70	64 - 66
		66C2	70	66 - 68
Area 66D	Residential (Planned)	66D1	70	66 - 69
		66D2	70	67 - 71
Area 67	Educational Institute	67S1	65	64 - 65
	(Planned)	67S2	65	66 - 68
		67S3	65	66 - 68
		67S4	65	67 - 67
		67S5	65	66 - 67
		67S6	65	70 - 72
Area 68A	Residential (Planned)	68A1	70	65 - 67
		68A2	70	61 - 62
Area 72A	Residential (Existing)	OSC1	70	64 - 65
Ocean Shores		OSC2	70	65 - 67
		OSC3	70	62 - 65
		OSC4	70	61 - 65
		OSC5	70	62 - 65
		OSC6	70	60 - 63
		OSC7	70	64 - 67
		OSC8	70	68 - 77
		OSC9	70	67 - 78
Area 73B	Residential (Under	73Ba	70	62 - 68
	Construction)	73Bb	70	61 - 68
		73Bc	70	65 - 66
		73Bd	70	65 - 68
		73Be	70	63 - 66
	Residential (Planned)	73B1	70	60 - 65
		73B2	70	67 - 69
		73B3	70	67 - 71
		73B4	70	68 - 73
		73B5	70	67 - 71
		73B6	70	64 - 68
	Educational Institute	73S1	65	61 - 64
	(Planned)	73S2	65	61 - 65
Area 74N	Residential (Existing)	CTH	70	67 - 70
		CYH	70	64 - 65
	Educational Institute (Existing)	PoK	65	62 - 65
Area 74S	Educational Institute	74S1	65	69 - 71
	(Planned)	74S2	65	70 - 72
		74S3	65	68 - 69
		74S4	65	68 - 70
		74S5	65	69 - 69
		74S6	65	69 - 69
Area 86	Residential (Planned)	N1	70	67 - 68
- Facing Cross Bay		N2	70	70 - 71
Link		N3	70	66 - 72
		N4	70	64 - 72
		N5	70	67 - 69
		N6	70	65 - 67
		N7	70	65 - 67
		N8	70	64 - 69
		N9	70	63 - 72
		N10	70	61 - 73
		N11	70	60 - 72
		N12	70	59 - 71
		N13	70	60 - 71
		N14	70	66 - 74
		N15	70	71 - 74
	Educational Institute (Planned)	PS3	65	64 - 68

Noise Sensitive Receivers near Eastern Portal of WCR

4.8.19 The predicted noise levels at the existing village houses (1-2 storeys high) in the vicinity of the eastern portal of the WCR would comply with the traffic noise criterion without the need for any noise mitigation measures.

Noise Sensitive Receivers at Area 56

4.8.20 Area 56 is a potential residential site in accordance with Tseung Kwan O Town Centre Layout Plan (L/TKO-66/1C). One representative point was selected for the assessment. The results indicated that the predicted noise levels would comply with the traffic noise criteria.

Noise Sensitive Receivers at Area 57

4.8.21 Park Central, located at Area 57, is an existing residential development on a 19m high podium. The results indicate that minor noise exceedance of around 1 dB(A) at NSRs TKC1 & TKC2 predominantly due to the proposed Road D4 flyover would be expected. Mitigation measures would be required to alleviate the traffic noise impact.

Noise Sensitive Receivers at Area 66A, 66B, 66C & 66D

4.8.22 Areas 66A, 66B, 66C and 66D are planned residential areas. Compliance with relevant noise standards is predicted at representative points in these areas. However, minor exceedance of 1 dB(A) is predicted at one sensitive façade at lower floors (NSR 66D2) in Area 66D. Mitigation measures are recommended to alleviate the traffic noise impacts.

Noise Sensitive Receivers at Area 67

4.8.23 Area 67 is planned for educational use. Exceedance of the noise criteria is predicted at the planned school facades (NSR 67S2 – 67S6). Mitigation measures would be required.

Noise Sensitive Receivers at Area 68A

4.8.24 Area 68A is planned residential areas. Predicted noise levels at planned facades (NSR 68A1, 68A2 and 68B1) would comply with the traffic noise criterion.

Noise Sensitive Receivers at Area 72

4.8.25 An existing residential development, Ocean Shores, is sited at Area 72. Results indicate that most of the representative facades would comply with the traffic noise criterion of 70 dB(A). Two facades (NSR OSC8 and OSC9) would not comply. The noise exceedance predicted at these two facades is predominantly due to traffic noise from the existing Chui Ling Road. Therefore, mitigation measures on the ‘new’ roads would not be required.

Noise Sensitive Receivers at Area 73B

4.8.26 Area 73B is a residential area with educational institutes. Results indicate that the sensitive facades at Tiu Keng Leng station development would comply with the noise criterion. However, exceedance is predicted at school facades (73B1 & 73B2) and residential facades (73B3 & 73B4). Mitigation measures would be required to alleviate traffic noise impacts.

Noise Sensitive Receivers at Areas 74N & 74S

4.8.27 Representative residential and school facades at Area 74N have been selected for assessment. The noise levels at Choi Ming Court and Po Kong Secondary School are predicted to comply with the noise criterion.

4.8.28 Six indicative points for planned schools in Area 74S were selected for assessment. Exceedance is predicted at all selected facades; therefore mitigation measures would be required.

Noise Sensitive Receivers at Area 86

4.8.29 Noise levels of up to 4 dB(A) above the relevant criterion are predicted at the residential facades facing the Cross Bay Link. Mitigation measures would be required on the Cross Bay Link.

Operational Phase - Ventilation Shaft and Pumping System Noise

4.8.30 Noise from ventilation structures and pumping stations is subject to statutory control, hence the designs will have to ensure that the required criteria are met at the closest NSRs.

4.8.31 An assessment of the potential noise impact on the existing and planned NSRs has been undertaken. The assessment results are summarised in Table 4.14. It was assumed that the ventilation buildings and pumping stations would be operated 24 hours a day. As the distance between each facility would be more than 300m, no cumulative fixed noise impacts would be expected.

Table 4.14 Potential Noise Impact from Fixed Noise Sources

Fixed Noise Source (FNS)	Representative NSRs	Area Sensitivity Rating (ASR) according to IND-TM	EIAO Daytime & Evening/ Night Time Criteria (dB(A))	Distance between FNS and NSRs (m)	Predicted Sound Power Levels for FNS (dB(A))
Western Portal Ventilation Building	EHC1	C	65/55	102	49
Eastern Portal Ventilation Building	V1	B	60/50	124	53
Pumping Station at TCS	OSC1	B	60/50	106	38
Pumping Station at Area 85	N16	B	60/50	112	37
Pumping Station at Area 78	78E6	B	60/50	60	42

4.8.32 Results indicated that all representative NSRs would comply with the EIAO daytime and evening time criteria. Except NSR V1, the representative NSRs would also comply with the EIAO night time criteria. Mitigation measures are therefore required to be implemented at Eastern Ventilation Building so as to alleviate the fixed noise impact on NSR V1 during night time. Detail calculation is presented in Appendix 4.9.

4.9 Mitigation of Adverse Environmental Impacts

Construction Noise – General Construction Works

Quieter PMEs 

4.9.1 Use of quieter PME, which are in accordance with BS 5228: Part:1 1997, is recommended to reduce construction noise impacts on the affected NSRs during construction. The Project Proponent has confirmed that the quiet construction equipment is commercially available. 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) Road 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

4.9.2 With the use of quieter equipment for some construction activities for TKO development (excluding Pak Shing Kok) and Kowloon section of WCR, the overall noise levels at NSRs could be reduced by 1 - 11 dB(A), depending on the type of construction activities. The list of recommended silenced PME and detailed assessment results are shown in Appendix 4.1. Summary of the predicted noise levels with adoption of quiet plant are shown in Table 4.15. Results indicated that noise exceedance would still be predicted at residential dwellings (including NSRs OSC2, TKC2, 67S1, BAG1, N23, CKL2, EHC1 and EHC2) and school NSRs (including NSR 67S3, 65C2, 65C3 and StA) during certain periods. Further mitigation measures would therefore be required. 

Table 4.15 Predicted Mitigated Construction Noise Levels at NSRs in Worst-Case Scenario (Using Quieter Plant)

Representative NSRs	Type of NSRs	Noise Criteria for the NSRs during normal working hours (dB(A))	Predicted Mitigated Construction Noise Levels during Normal Daytime Working Hour (dB(A))
OSC2	Residential	75	62 – 80
OSC5	Residential	75	59 – 73
OSC7	Residential	75	58 – 74
TKC2	Residential	75	66 – 78
TKC11	Residential	75	62 – 74
66A3	Residential	75	59 – 76
67S1	School	70 / 65	56 – 67
67S3	School	70 / 65	63 – 6979
BAG1	Residential	75	64 – 79
BAG10	Residential	75	63 – 72
TKP4	Residential	75	58 – 67
OS7	Residential	75	54 – 73
65C2	School	70 / 65	56 – 80
65C3	School	70 / 65	69 – 78
N2	Residential	75	62 – 74
N14	Residential	75	62 – 66
N23	Residential	75	63 – 76
V1	Residential	75	66 – 75
CKL2	Residential	75	62 – 77
CP	Residential	75	56 – 72
StA	School	70 / 65	59 – 69
EHC1	Residential	75	67 – 79
EHC2	Residential	75	64 – 80

Movable Noise Barrier

4.9.3 With the implementation of quiet PMEs, some NSRs would still be exposed to noise level exceeding the construction noise criteria. In order to further alleviate the construction noise impacts on the affected NSRs, movable noise barriers are recommended for particular plant during construction. It is expected that a movable noise barrier (the width is usually five times of its height) with a cantilevered upper portion (5m high with 1.5m cantilevered length at least) composed of impervious plywood screen with density no less than 7kg/m² mounted on a skid footing, located close to the noise generating part of the PMEs such that the line of sight could be blocked by the barriers produce at least 5 dB(A) or up to 10 dB(A) noise screening effect, depending on whether when the line of sight could be blocked by the barriers when viewed from the NSRs, can produce at least 10 dB(A) screening for stationary plant and large plant such as vibratory poker, compactor and air compressor and 5 dB(A) for mobile plant including mobile crane, excavator, concrete pump truck, winch and roller.. The Contractor can propose alternative types of barrier having the same equivalent of noise reduction, to be used during construction. Detailed assessment results are presented in Appendix 4.1 and the construction tasks that require 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 Deport (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) Road 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

4.9.4 The mitigated noise levels at representative NSRs, with adoption of quiet plant and movable noise barriers, are summarised in Table 4.16. Maximum further noise reduction up to 7 dB(A) in cumulative noise levels at NSRs is expected with the implementation of movable noise barriers. Results show that the mitigated noise levels at representative NSRs would comply with the construction noise criteria. The project proponent confirmed that the above proposed mitigation measures would be feasible and practical to be adopted on site and would not have any potential implications on the work programme.

Table 4.16 Predicted Mitigated Construction Noise Levels at NSRs in Worst-Case Scenario (Quiet Plant + Movable Noise Barrier)

Representative NSRs	Type of NSRs	Noise Criteria for the NSRs during normal working hours (dB(A))	Predicted Mitigated Construction Noise Levels during Normal Daytime Working Hour (dB(A))
OSC2	Residential	75	58 – 75
TKC2	Residential	75	62 – 75
66A3	Residential	75	55 – 75
67S1	School	70 / 65	56 – 63
67S3	School	70 / 65	62 – 69 / 62 – 65 ^#
BAG1	Residential	75	64 – 75
65C2	School	70 / 65	55 – 70 / 55 – 65 ^#
65C3	School	70 / 65	689 – 70 / 65 – 65 ^#
N23	Residential	75	63 – 71
CKL2	Residential	75	62 – 75
StA	School	70 / 65	59 – 65
EHC1	Residential	75	67 – 75
EHC2	Residential	75	64 – 75

Note: # During School Examination Period

4.9.5 In addition to the use of the above mitigation measures, good site practices listed below should be adopted to further abate any residual impacts during the construction phase. These measures should be included in the contract documents.

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

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

Ÿ Idle equipment should be turned off or throttled down.

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

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

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

Ÿ A noise monitoring programme should be instigated.

4.9.6 A rigorous EM&A programme should be undertaken, which would focus on those NSRs of particular concern, in order to identify and rectify any problems. A recommended programme is presented in the EM&A Manual.

Construction Noise – Blasting

4.9.7 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.

4.9.8 In view of the noise impact from blasting for a very short time periods (a few seconds only), construction noise monitoring for underground blasting of the drill-&-blast tunnel is not necessary.

Operation Noise – Road Traffic Noise

4.9.9 In order to alleviate the traffic noise impacts on affected NSRs, appropriate mitigation measures are recommended. The predicted mitigated results are presented in Appendices 4.6 and 4.7 and the results are discussed in the following paragraphs. The mitigated noise contours are presented in Figures 4.14 – 4.19.

Year Traffic Flow 2016 - TKO Area

4.9.10 In order to alleviate the adverse traffic noise impacts on Pak Shing Kok (Area 78), Area 86 and TKO Town Centres including Areas 65B and 65C, a series of direct mitigation measures (DMMs) are recommended as follows. The mitigated noise levels for representative NSRs in TKO Areas based on the traffic forecast Year 2016 are summarised in Table 4.17.

Area 78 - Pak Shing Kok

4.9.11 For Pak Shing Kok (Area 78), the proposed residential buildings would be 8 storeys high in Area 78E. As the traffic flow is high along Wan Po Road, setback requirement from Wan Po Road and height restriction would be required to reduce noise levels to meet the limit level. In addition, a 5m high boundary wall at the site boundary of Area 78E facing Wan Po Road and Road L781 is also recommended. The following setback requirement and height restriction for the residential block at Area 78E were considered in the assessment. Details refer to Figure 4.7d.

NSR ID (Refer to Figure 4.7d)	Setback Requirement (m)	Height Restriction
NSR 78E1a	30m from site boundary	84.2 mPD
NSR 78E1b	40m from site boundary	89.8 mPD
NSR 78E2a	10m from site boundary	73 mPD
NSR 78E2b	20m from site boundary	78.6 mPD
NSR 78E2c	30m from site boundary	84.2 mPD
NSR 78E2d	40m from site boundary	89.8 mPD
NSR 78E3a	10m from site boundary	73.0 mPD
NSR 78E3b	20m from site boundary	78.6 mPD
NSR 78E3c	30m from site boundary	81.4 mPD
NSR 78E3d	40m from site boundary	87.0 mPD
NSR 78E3e	50m from site boundary	89.8 mPD
NSR 78E4a	10m from site boundary	78.6 mPD
NSR 78E4b	20m from site boundary	89.8 mPD
NSR 78E5	10m from site boundary	-
NSR 78E6	10m from site boundary	-

4.9.12 In order to comply with the traffic noise criteria, it is recommended the following measures to be implemented for future development in Area 78E. The mitigation measures have been agreed with PlanD and proposed measures would be incorporated in the relevant OZP/ODP/Layout Plans/Explanatory Statements for PlanD’s implementation.

· Maximum of 50m setback from site boundary facing Wan Po Road and junction of Wan Po Road and Road L781 as indicated in Figure 4.7d.

· 10m setback from the footpath of Road L781 for Area 78A, 78B & 78E as shown in Figure 4.7d.

· 5m high boundary wall at the site boundary of Area 78E facing Wan Po Road and Road L781 as indicated in Figure 4.7d.

Area 86 near Road L861

4.9.13 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 as indicated in Figure 4.7g.

· 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 as indicated in Figure 4.7g.

· Low noise surfacing on at-grade Road L861 eastbound and westbound (~ 230 m in length) as indicated in Figure 4.7g.

4.9.14 With the implementation of the above mitigation measures, exceedances of 1 dB(A) were still predicted at NSRs N16 and N17, however, contributed from MTRC Access Ramp to Area 86 and existing roads. Exceedances were still predicted at some school facades, due to contributed from existing Wan Po Road only or contributed from both Wan Po Road and L861. As the concerned road section (close to the planned school) is an inclined road, it is not feasible to apply the low noise surfacing. It was recommended to provide indirect noise mitigation measures (provision of air-conditioning and insulated windows) on the affected school facades, according to the standard measures stipulated in the Class Assessment Document (CAD) prepared by Arch SD.

TKO Areas

4.9.15 For planned residential and educational institutes at Area 65 (Site 65B and Site 65C), setback from source lines is recommended to alleviate traffic noise impacts. The recommended set-back requirement was also agreed by PlanD and would be incorporated in the relevant OZP/ODP/Layout Plans/Explanatory Statements for PlanD’s implementation.

· 10 - 15 m setback from the footpath of Chi Shin Street for Area 65 - Site 65B (R2) and also Site 65C (OU) (as indicated in Figure 4.7c).

4.9.16 With the implementation of the above mitigation measures, only the school facades represented by NSRs 65C1 - 65C3 would not comply with the traffic noise criterion of 65 dB(A) due to traffic noise from ‘new’ roads. The noise impacts on the school Area 65C would be mainly contributed from Road L651. Road L651 is sandwiched between an existing school on the north and a committed through train school on the south. The site boundary of the through train school has been agreed and there is just enough space to accommodate the road requirements including the associated footpath. Road noise barrier is considered not feasible as there is also a planned lay-by fronting the school for dropping off. Indirect noise mitigation measures stipulated in the CAD such as installation of air conditionings and glazing windows are therefore recommended for these affected schools. Mitigated results are presented in Appendix 4.7.

Table 4.17 Mitigated Traffic Noise Levels at Representative NSRs in TKO Area in Year 2016

			Noise	Predicted Noise
Area	Type	NSR ID	Limit, dB(A)	Level, dB(A)
Area 51	Residential (Existing)	OS1	70	48 - 64
		OS2	70	49 - 63
		OS3	70	57 - 62
		OS4	70	60 - 62
		OS5	70	60 - 61
		OS6	70	60 - 61
Area 55A	Residential (Existing)	TKP1	70	63 - 66
		TKP2	70	61 - 67
		TKP3	70	60 - 67
		TKP4	70	62 - 67
		TKP5	70	68 - 70
Area 55B	Residential (Under Construction)	55B1	70	61 - 66
(The Grandiose)		55B2	70	58 - 66
		55B3	70	66 - 69
Area 65A	Residential (Existing)	BaG1	70	60 - 66
		BaG2	70	56 - 66
		BaG3	70	61 - 65
		BaG4	70	63 - 67
		BaG5	70	50 - 64
		BaG6	70	47 - 65
		BaG7	70	59 - 65
		BaG8	70	61 - 62
		BaG9	70	61 - 62
		BaG10	70	63 - 64
	Educational Institute (Existing)	KG	65	45 - 49
Area 65B	Residential (Planned)	65B1	70	60 - 65
		65B2	70	66 - 70
		65B3	70	66 - 70
Area 65C	Educational Institute (Planned)	65C1	65	70 - 72
		65C2	65	69 - 70
		65C3	65	69 - 69
		65C4	65	65 - 65
	Educational Institute (Existing)	65C6	65	65 - 65
	Residential (Planned)	65C7	70	66 - 70
		65C8	70	59 - 61
		65C9	70	56 - 59
		68B1	70	55 - 57
Area 78	Residential (Planned)	78B1	70	65 - 67
		78B2	70	62 - 62
		78E1a	70	57 - 70 (6F)
		78E1b	70	56 - 70 (8F)
		78E2a	70	60 - 66 (2F)
		78E2b	70	58 - 69 (4F)
		78E2c	70	57 - 69 (6F)
		78E2d	70	56 - 70 (8F)
		78E3a	70	59 - 67 (2F)
		78E3b	70	58 - 70 (4F)
		78E3c	70	57 - 69 (5F)
		78E3d	70	56 - 70 (7F)
		78E3e	70	55 - 69 (8F)
		78E4a	70	58 - 70 (4F)
		78E4b	70	57 - 70 (8F)
		78E5	70	66 - 70
		78E6	70	68 - 70
	Educational Institute (Planned)	S1	65	42 - 47
		S2	65	44 - 51
Area 86	Residential (Planned)	N16	70	66 - 72
		N17	70	67 - 71
		N18	70	67 - 70
		N19	70	67 - 70
		N20	70	67 - 69
		N21	70	67 - 68
		N22	70	69 - 70
	Educational Institute (Planned)	PS1	65	76 - 77
		PS2	65	66 - 70

Year 2031 Traffic Flow - Kowloon Area

4.9.17 The following direct mitigation measures (DMMs) 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 (see Figure 4.6a, b, & c).

· 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) (see Figure 4.6b).

· A 105 m long partial enclosure (6 m high) for the eastbound carriageway of the WCR (CH4430 – CH4535) (see Figure 4.6a).

· A 285 m long full enclosure (6 m high) for both carriageways of the WCR (CH4435 – CH4720) (see Figure 4.6a).

· 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) (see Figure 4.6a).

· A 40 m long full enclosure (6m high) for both carriageways of the WCR (CH4800 – CH4840) (see Figure 4.6a).

· A 100 m long full enclosure (5.5m high) for both carriageways of the WCR (CH4900 – CH5000) (see Figure 4.6b).

· 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) (see Figure 4.6c).

· 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) (see Figure 4.6c).

· 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) (see Figure 4.67c).

· A 235 m long partial enclosure (5.5 m high) for the Slip Road EHC 3 (~CH 170 – CH405) (see Figure 4.7c).

· 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”(see Figure 4.6b).

· A 65 m long and 3 m high vertical barrier, with a setback distance (see Figure 4.6b) from Cha Kwo Ling Road Roundabout.

4.9.18 With the implementation of the above noise mitigation measures, exceedance of the noise limits is still predicted at Laguna City; existing development along Cha Kwo Ling Road; school village at the Kaolin Mine Site; KMS Housing Development to the South of the WCR; residential development near the Eastern Harbour Crossing; CCC Kei Fat Primary School; St. Antonius Primary School and Kindergarten; SKH Kei Hau Secondary School; Sceneway Garden; and Ping Tin Estate. However, the noise exceedance is predominantly due to existing roads; model predictions indicate that the new roads contribute less than 1 dB(A) to the overall noise level and the predicted noise level arising from the new roads is less than 70 dB(A). Therefore further mitigation measures on new roads would not improve the situation. Regarding Cha Kwo Ling Tin Hau Temple, erection of a 65m long and 3 m high vertical transparent barrier at Cha Kwo Ling Road Roundabout (refer to Figure 4.6b x) is recommended to alleviate the traffic noise impacts. However, the installation of this barrier is subject to any confirmationobjections from the temple owner, DO and AMO in the implementation stage. The mitigated noise levels at representative NSRs in Kowloon Area based on traffic flow forecast Year 2031 are summarised in Table 4.18. Detailed mitigated results are presented in Appendix 4.7.

Table 4.18 Mitigated Traffic Noise Levels at Representative NSRs in Kowloon Area in Year 2031

NSR	NSR ID	Noise	Predicted Noise Level,
		Limit
		dB(A)	dB(A)
Laguna City	LC1	70	72 - 75
	LC2	70	69 - 71
Existing Residential Development	CKL1	70	75 - 77
along Cha Kwo Ling Road	CKL2	70	77 - 81
Private Residential Development	H1	70	63 - 69
at the North of WCR	H2	70	60 - 69
	H3	70	60 - 70
	H4	70	60 - 70
KMS Housing Development at	H10	70	66 - 68
the South of WCR	H11	70	62 - 67
	H12	70	67 - 70
	H13	70	69 - 70
	H14	70	65 - 70
	H15	70	67 - 70
	H16	70	66 – 69
	H17	70	64 - 70
	H18	70	63 - 71
	H19	70	59 - 70
	H20	70	62 - 70
Cha Kwo Ling Tin Hau Temple	T1	65	–65 - 6565
Residential Development	EHC1	70	61 - 71
near Eastern Harbour Crossing	EHC2	70	58 - 75
	EHC3	70	59 - 72
	EHC4	70	59 - 74
	EHC5	70	61 - 76
	EHC6	70	58 - 74
	EHC7	70	63 - 76
CCC Kei Fat Primary School	S1	65	76 - 76
	S2	65	76 - 76
	S3	65	74 - 75
School Development	HS1	65	63 - 67
at the North of WCR	HS2	65	64 - 66
	HS3	65	66 - 68
	HS4	65	71 - 71
St.Antonius Pri. Sch. and Kindergarten	StA	65	67 - 69
Sceneway Garden	SG1	70	74 - 76
Ping Tin Estate	PW	70	70 - 74
Hong Pak Court	CP	70	67 - 70
Lung Pak House	LP	70	62 - 69
SKH Kei Hau Sec.Sch.	KH	65	79 - 79

Year 2031 Traffic Flow - TKO Areas

4.9.19 The following direct mitigation measures (DMMs) are recommended on the proposed ‘new’ roads to alleviate adverse traffic noise impacts at affected NSRs including NSRs at Area 57, 66D, 67, 73B, 74N, 74S and 86 next to CBL.

· 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 (see Figure 4.7b).

· Proposed 5 m high vertical barrier at the west side of the boundary for Area 73B along Chui Ling Road (see Figure 4.7a).

· 3 m high boundary wall for planned schools at Area 67 and Area 74S (see Figure 4.7b).

· 145 m setback from the footpath of Tong Chun Street for Area 66 – Site 66D (see Figure 4.7c).

· 15 m setback from the footpath of Road L673 for Area 67 (see Figure 4.7b).

4.9.20 The above proposed setback requirements for Area 66D and Area 67 were agreed by PlanD and be incorporated in the relevant OZP/ODP/Layout Plans/Explanatory Statements for PlanD’s implementation. 3 m high boundary walls for planned schools at Area 67 and Area 74S are according to the measures set out in the CAD for Standards School as prepared by Arch SD. Regarding Area 73B, existing Chui Ling Road would be dominant noise to the housing site development. The proposed 5 m high vertical barrier for Area 73B in this assessment just indicated the possibility for complying with the noise criteria. Housing Department would implement the noise mitigation measures for Area 73B based on their own environmental assessment.

4.9.21 For MTRC Area 86 Development near CBL, in addition to the measures proposed from the developer (canopy along the site boundary of the development), the following barriers are proposed to alleviate traffic noise impact from CBL. The locations of proposed barriers are indicated in Figure 4.7.

· 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) (see Figure 4.7e).

· 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 Road D9 (CH 9728 – CH 9868) (see Figure 4.7f).

· 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) (see Figure 4.7e).

· 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) (see Figure 4.7f).

· 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) (see Figure 4.7f).

4.9.22 The mitigated results at representative NSRs at TKO side based on Year 2031 traffic flow forecast are summarised in Table 4.19. Detailed mitigated results are presented in Appendix 4.7.

Table 4.19 Mitigated Traffic Noise Levels at Representative NSRs in TKO Area in Year 2031

			Noise	Predicted Noise Level,
Area	Type	NSR ID	Limit, dB(A)	dB(A)
Village Houses	Residential (Existing)	V1	70	70 - 70
at North of Eastern		V2	70	69 - 70
Portal of WCR		V3	70	57 - 62
Area 56A	Residential (Planned)	56A	70	56 - 65
Area 57	Residential (Existing)	TKC1	70	66 - 70
		TKC2	70	68 - 70
		TKC3	70	66 - 68
		TKC4	70	67 - 69
		TKC5	70	66 - 69
		TKC6	70	66 - 69
		TKC7	70	66 - 69
		TKC8	70	66 - 69
		TKC9	70	66 - 69
		TKC10	70	65 - 69
		TKC11	70	66 - 69
		TKC12	70	66 - 69
Area 66A	Residential (Planned)	66A1	70	65 - 69
		66A2	70	65 - 70
		66A3	70	65 - 67
		66A4	70	63 - 65
Area 66B	Residential (Planned)	66B1	70	65 - 69
		66B2	70	63 - 69
		66B3	70	62 - 70
		66B4	70	62 - 70
		66B5	70	64 - 68
Area 66C	Residential (Planned)	66C1	70	64 - 66
		66C2	70	66 - 68
Area 66D	Residential (Planned)	66D1	70	66 - 69
		66D2	70	67 - 70
Area 67	Educational Institute	67S1	65	64 - 65
	(Planned)	67S2	65	58 - 65
		67S3	65	58 - 65
		67S4	65	64 - 67
		67S5	65	64 - 66
		67S6	65	69 - 69
Area 68A	Residential (Planned)	68A1	70	64 - 67
		68A2	70	61 - 63
Area 72A	Residential (Existing)	OSC1	70	64 - 65
		OSC2	70	66 - 67
		OSC3	70	62 - 65
		OSC4	70	61 - 65
		OSC5	70	62 - 65
		OSC6	70	60 - 63
		OSC7	70	64 - 67
		OSC8	70	68 - 77
		OSC9	70	67 - 78
Area 73B	Residential (Under Construction)	73Ba	70	62 - 68
		73Bb	70	61 - 68
		73Bc	70	65 - 66
		73Bd	70	65 - 68
		73Be	70	63 - 66
	Residential (Planned)	73B1	70	60 - 65
		73B2	70	67 - 68
		73B3	70	65 - 70
		73B4	70	66 - 72
		73B5	70	67 - 70
		73B6	70	64 - 68
	Educational Institute (Planned)	73S1	65	61 – 64
		73S2	65	61 - 65
Area 74N	Residential (Existing)	CTH	70	67 - 69
		CYH	70	64 - 65
	Educational Institute (Existing)	PoK	65	62 - 65
Area 74S	Educational Institute (Planned)	74S1	65	60 - 68
		74S2	65	62 - 68
		74S3	65	63 - 68
		74S4	65	63 - 68
		74S5	65	65 - 69
		74S6	65	65 - 68
Area 86	Residential (Planned)	N1	70	64 - 66
- Facing Cross Bay		N2	70	68 - 70
Link		N3	70	66 - 70
		N4	70	64 - 70
		N5	70	67 - 68
		N6	70	65 - 66
		N7	70	65 - 66
		N8	70	63 - 68
		N9	70	63 - 70
		N10	70	61 - 70
		N11	70	60 - 69
		N12	70	59 - 68
		N13	70	60 - 67
		N14	70	65 - 70
		N15	70	69 - 74
	Educational Institute (Planned)	PS3	65	64 - 68

4.9.23 With the implementation of the above mitigation measures, exceedance of noise limit at residential facades of Ocean Shores (NSRs OSC8 & OSC9) would still be predicted. However, the exceedance would be dominantly due to existing roads and ‘new’ road contribution would be less than 1 dB(A). No further mitigation measures on ‘new’ roads would be recommended. Noise exceedances at NSR 73B4 would still predicted due to existing roads. The proposed development at Area 73B is owned by Housing Department. The noise mitigation measures for Area 73B proposed in this EIA study are indicative assessment only. Housing Department would implement the noise mitigation measures based on their own environmental assessment study.

4.9.24 Regarding the school facades, school facades including NSR 74S5 – 74S6 and NSR 67S4 – 67S6 would not comply with the traffic noise criterion of 65 dB(A) due to ‘new’ roads (i.e. the contribution from ‘new’ roads to the total noise level would be more than 1 dB(A)). Exceedance of the noise limit at school facades NSR S74S1 – S74S4 would be expected, predominantly due to existing roads. According to the standard measures stipulated in the CAD for Standards School, indirect noise mitigation measures such as installation of air conditioning and appropriate window glazing would be implemented by Arch SD for these affected schools to alleviate the traffic noise impacts.

4.9.25 For Area 86 development next to CBL, the predicted noise levels at residential façade NSR 15 and school façade NSR PS3 would not comply with the traffic noise criteria, dominantly due to existing Wan Po Road and the ‘new’ road contribution to the total noise level would be less than 1 dB(A). Therefore, further mitigation measures on ‘new’ road are considered unnecessary.

Operational Phase - Ventilation Shaft and Pumping System Noise

4.9.26 Assessment results indicated that the representative NSR V1 would exceed night time noise criteria due to the operation of Eastern Ventilation Building. It is recommended to install acoustic silencers for the reversible fans to diminish the impacts. With the implementation of mitigation measures, the predicted noise levels at NSR V1 be 48 dB(A), complying with the night time noise criteria of 50 dB(A). Detail calculation is presented in Appendix 4.9.

4.10 Evaluation of Residual Impacts

Construction Phase

4.10.1 With the implementation of the above-mentioned mitigation measures, the construction noise levels at all representative NSRs are predicted to comply with the noise standard stipulated in EIAO-TM. The above mitigation measures have been confirmed to be practical for completion of the works within the scheduled timeframe. Residual impacts are not expected.

Operational Phase - Traffic Noise

4.10.2 With the implementation of all practical direct mitigation measures as proposed, there would still be some exceedance of noise limits at the existing and planned sensitive receivers. The predicted non-compliance at existing NSRs is predominantly due to existing traffic. Residual impacts from ‘new’ roads would occur at some schools, as well as at planned developments where direct noise mitigation measures are not practicable at the source - such as road junctions. Further investigation during the detailed design stage of the building projects should be carried out to assess the potential for adopting tailor-made building layout plans to reduce the exposure to traffic noise. Indirect technical remedies in the form of acoustic insulation and air conditioning may be used as a last resort when practical measures have been exhausted.

4.10.3 An estimate of the number of existing dwelling and classrooms that will be exposed to noise levels exceeding the EIAO-TM criteria in the unmitigated scenario and the mitigated scenario is listed in Tables 4.20, 4.21 and 4.22.

Table 4.20 Number of Non-compliant Existing Dwellings and Classrooms at TKO Area (Year 2016)*

NSR TYPE	NSR	Top Floor	Total No. of Dwelling affected by the Project	Total Number of Dwellings/ Classrooms non-compliant			Exceedance due to New Roads (³ 1.0 dB(A))
				Unmitigated		Mitigated	Unmitigated	Mitigated
Residential	Choi Ming Court	20F - 40F	-	-	-		-	-
	Park Central	46F - 48F	-	-	-		-	-
	Ocean Shores	47F - 48F	-	-	-		-	-
	Bauhinia Garden	41F	1880	0	0		0	0
	Teung Kwan O Plaza	45F	720	0	0		0	0
	Oscar by the Sea	40F - 59F	1316	0	0		0	0
	Village House	2F	-	-	-		-	-
Education Institution	Po Kok Secondary School	7F	-	-	-		-	-
Total		Residential	53963916	3880	240		3720	0
		Education Institution	0	0	0		0	0

Note: * For comparison with Table 4.22

Table 4.21 Number of Non-compliant Existing Dwellings and Classrooms at Kowloon Area (Year 2031)

NSR TYPE	NSR	Top Floor	Total No. of Dwelling affected by the Project	Total Number of Dwellings/ Classrooms non-compliant		Exceedance due to New Roads (³ 1.0 dB(A))
				Unmitigated	Mitigated	Unmitigated	Mitigated
Residential	Laguna City	25/F-27/F	819	200	194	2	0
	Cha Kwo Ling Road	5/F-11/F	245	191	191	0	0
	Sceneway Garden	28/F-32/F	420	233	233	0	0
	Ping Tin Estate	38/F	684	360	204	360	0
Education Institution	St. Antonius P.S. (StA)	7/F	9814	9814	9814	980	980
	Kei Hau S.S. (KH)	6/F	6	6	6	60	60
	CCC Kei Fat P.S.	6/F	24	24	24	0	0
Total		Residential	62672168	2483984	1363822	1861362	0
		Education Institution	44104	44104	44104	104	104

Table 4.22 Number of Non-compliant Existing Dwellings and Classrooms at TKO Area (Year 2031)

NSR TYPE	NSR	Top Floor	Total No. of Dwelling affected by the Project	Total Number of Dwellings/ Classrooms non-compliant			Exceedance due to New Roads (³ 1.0 dB(A))
				Unmitigated		Mitigated	Unmitigated	Mitigated
Residential	Choi Ming Court	20F - 40F	220	0	0		0	0
	Park Central	46F - 48F	1340	25	0		25	0
	Ocean Shores	47F - 48F	3300	153	153		0	0
	Bauhinia Garden	41F	-	-	-		-	-
	TKO Plaza	45F	-	-	-		-	-
	Oscar by the Sea	40F - 59F	-	-	-		-	-
	Village House	2F	8	0	0		0	0
Education Institution	Po Kok Secondary School	7F	14	0	0		0	0
Total		Residential	82544868	1460178	377153		68525	0
		Education Institution	2014	30	20		30	20

4.10.4 No adverse secondary effects from the mitigation measures for operation phase are expected.

Operational Phase - Ventilation Shaft and Pumping System Noise

4.10.5 No residual fixed plant noise impacts arising from the proposed ventilation buildings and pumping stations are expected, provided that the acoustic silencers installed at the Eastern Portal Ventilation Building to meet the recommended noise levels.

4.11 Environmental Monitoring and Audit

Construction Phase

4.11.1 An Environmental Monitoring and Audit (EM&A) programme has been established according to the predicted occurrence of noisy activities. All the recommended mitigation measures should be incorporated into the EM&A programme for implementation during construction. Details of the programme are provided in the stand-alone EM&A Manual.

Operational Phase

4.11.2 Monitoring of operation noise is considered necessary to verify the effectiveness of the mitigation scheme. It is recommended that traffic noise monitoring for WCR/P2, CBL, D9 and the D4 Flyover should be carried out at representative NSRs during the first year after road opening. Noise monitoring will also be required during the commissioning stage of the Eastern Portal Ventilation Building to ensure compliance with the EIAO noise limits.

4.11.3 The recommended mitigation measures, monitoring procedures and locations are presented in the stand-alone EM&A Manual.