4 Noise impact

4.1 Introduction

4.1.1.1 This section presents an assessment of potential noise impacts associated with the construction and operation of the Project. The noise impact assessment has been conducted in accordance with the requirements of Annex 5 and Annex 13 of the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM) as well as the requirements set out in Clause 3.4.5 of the Environmental Impact Assessment (EIA) Study Brief (No. ESB-343/2021) (hereinafter “the Study Brief”).

4.1.1.2 As detailed in Section 2, there are four potentially concurrent projects, namely Improvement Works at Tsuen Tsing Interchange (“IWTTI project”), Improvement Works at Tai Chung Road Interchange (TCRI), Proposed Columbarium Building at No. 10 Tsing Tsuen Road and Flyover from Kwai Tsing Interchange (KTI) Upramp to Kwai Chung Road (KCR).

4.1.1.3 Based on the latest available information, construction phase of the IWTTI project is anticipated to commence in 2023 and be completed in 2026. No potential cumulative impact due to the construction of the IWTTI project is anticipated in this EIA Study. Furthermore, the cumulative impact during operation phase of the Project in association with the IWTTI project has been considered.

4.1.1.4 Improvement Works at Tai Chung Road Interchange (IWTCRI project) is a modification to the existing Tai Chung Road Interchange (TCRI). IWTCRI project mainly comprises provision of exclusive left-turn lane from Hoi Hing Road to TWR (Tuen Mun bound); provision of free-flow left-turn lane from Tai Chung Road to TWR (Kowloon bound); and refinement of TCRI roundabout and associated arms refinement road side works. The construction of the IWTCRI project is anticipated to commence in 2028 and complete in 2030. Upon completion of the IWTCRI project, the current congested traffic condition at TCRI will be alleviated. With reference to the construction programme of the Project, the construction of Slip Road E would be carried out from 2030 to 2033. Therefore, the construction works of IWTCRI and Slip Road E would not be conducted concurrently while the construction works of other parts of the Project will be carried out with separation distance of more than 300m. Hence, the cumulative adverse impact arising from this concurrent project is insignificant. Furthermore, as the forecast traffic flow data adopted for environmental assessments in the Project already included the effect of the completion of IWTCRI project, the cumulative impact during the operation phase of the IWTCRI project has been considered. No other cumulative environmental impacts would be anticipated during operation phase of the IWTCRI.

4.1.1.5 For the Proposed Columbarium Building at No. 10 Tsing Tsuen Road project, the construction works are anticipated to commence in Q2 2024 and be completed in Q2 2030. With consideration that the noisy construction activities of the Columbarium Building would be the site formation and foundation works which are anticipated to be substantially completed before construction for the Project commences in 2028, concurrent works between the two projects could be minimized via efficient and close liaison between HyD’s and the Board of Management of the Chinese Permanent Cemeteries (BMCPC)’s contractors to minimize construction works to be carried out concurrently at the close proximity areas near Tsuen Wan Road. The proposed construction activities for Slip Road C and associated works under the Project at Tsing Tsuen Road will commence in January 2033 and as such, no potential cumulative impact at this location is expected. With this arrangement in place, cumulative construction noise impact is expected to be minimized. Given the nature of the proposed columbarium building, cumulative impact during operation phase of the Project in association with the columbarium building project is not expected.

4.1.1.6 For the Flyover from KTI Upramp to KCR project, the construction works are anticipated to be completed in Q1 2025, which is before the commencement of construction phase of the Project (tentatively in Q1 2028). As such, potential cumulative impacts with the construction of the Project is not anticipated. Furthermore, the cumulative impact during operation phase of the Project has been considered.

4.2 Environmental Legislation, Standards and Criteria

4.2.1 General

4.2.1.1 Noise impact has been assessed in accordance with the criteria and methodology given in the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM) and the Technical Memoranda made under the Noise Control Ordinance (NCO).

4.2.1.2 The NCO and EIAO provide the statutory framework for noise control. Assessment procedures and standards are set out in the following TMs:

· Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM);

· Technical Memorandum for the Assessment of Noise from Places other than Domestic Premises, Public Places or Construction Sites (IND-TM);

· Technical Memorandum on Noise from Construction Work in Designated Areas (DA-TM);

· Technical Memorandum on Noise from Construction Work other than Percussive Piling (GW-TM); and

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

4.2.1.3 With regard to the assessment of the construction noise impact during restricted hours (i.e. between 19:00 and 07:00 hours and at any time on Sundays and general holidays), the NCO designates Acceptable Noise Levels (ANLs) for Noise Sensitive Receivers (NSRs) on the basis of an Area Sensitivity Rating (ASR), based on the characteristics of the area within which they are located such as rural, village, low-density residential, or urban (refer to Table 4.1). Within these areas, the presence of "influencing factors" (such as the presence of industrial area or major roads) can further affect the ASR and hence the acceptable noise levels.

Table 4.1 Area Sensitivity Ratings (ASRs)

Type of Area Containing NSR	Degree to which NSR is affected by Influencing Factor
	Not Affected	Indirectly Affected	Directly Affected
Rural area, including country parks or village type developments	A	B	B
Low density residential area consisting of low-rise or isolated high-rise developments	A	B	C
Urban area	B	C	C
Area other than those above	B	B	C

Notes:

· “Country park” means an area that is designated as a country park pursuant to section 14 of the Country Parks Ordinance;

· “Directly affected" means that the NSR is at such a location that noise generated by the IF is readily noticeable at the NSR and is a dominant feature of the noise climate of the NSR;

· "Indirectly affected" means that the NSR is at such a location that noise generated by the IF, whilst noticeable at the NSR, is not a dominant feature of the noise climate of the NSR;

· "Not affected" means that the NSR is at such a location that noise generated by the IF is not noticeable at the NSR; and

· "Urban area" means an area of high density, diverse development including a mixture of such elements as industrial activities, major trade or commercial activities and residential premises.

4.2.2 Construction Noise

General Construction Works

4.2.2.1 The NCO provides the statutory framework for noise control of construction works, other than percussive piling, using powered mechanical equipment (PME) between the hours of 1900 and 0700 hours or at any time on Sundays and general holiday (that is, restricted hours). Noise from construction activities taking place at 0700 – 1900 hours on any day not being a Sunday or general holiday is subject to the Noise Standards for Daytime Construction Activities stated in Table 1B of Annex 5 in the EIAO-TM. The noise limit is L_{eq(30 minutes)} 75 dB(A) at 1m from the external façades of domestic premises, hotels and hostels which rely on opened window for ventilation, and L_{eq(30 minutes)} 70 dB(A) at 1m from the external façade of educational institutions which rely on opened window for ventilation (L_{eq(30 minutes)} 65 dB(A) during examinations).

Construction Works during Restricted Hours

4.2.2.2 On all days between 1900 and 0700 hours and at any time on Sundays and general holidays, the use of PME for the purpose of carrying out construction works is prohibited unless a Construction Noise Permit (CNP) has been obtained. A CNP may be granted provided that the ANL for the NSRs can be complied with. ANLs are assigned depending upon the ASR and are given in Table 4.2.

Table 4.2 Acceptable Noise Levels under the Technical Memorandum on Noise from Construction Work other than Percussive Piling

Time Period	Acceptable Noise Level (ANLs), dB(A)
	ASR A	ASR B	ASR C
All days during the evening (1900 to 2300 hours), and general holidays (including Sundays) during the daytime and evening (0700 to 2300 hours)	60	65	70
All days during the night-time (2300 to 0700 hours)	45	50	55

4.2.2.3 The Noise Control Authority will consider a well-justified CNP application, for construction works within restricted hours as guided by the relevant Technical Memoranda issued under the NCO. The Noise Control Authority will take into account of contemporary conditions / situations of adjoining land uses and any previous complaints against construction activities at the site before making his decision in granting a CNP. Nothing in this EIA shall bind the Noise Control Authority in making his decision. If a CNP is to be issued, the Noise Control Authority shall include in it any condition he thinks fit. Failure to comply with any such conditions will lead to cancellation of the CNP and prosecution action under the NCO.

4.2.2.4 Under the DA-TM, 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; and

· Hammering.

4.2.2.5 In general, it should not be presumed that a CNP may be granted for carrying out PCW within a designated area during restricted hours only if the location of work being carried out is screened by solid barriers, such as purpose-designed acoustic screens, buildings or topographical features. 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. The ANLs for the use of SPME within a designated area (i.e. those listed in DA-TM) are more stringent (i.e. 15 dB(A) lower than those listed in the GW-TM) to offer additional protection to the population.

Piling Works during non-restricted hours

4.2.2.6 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 the 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 for the CNP applications. The permitted hours of operations would be 3, 5 or 12 hours per day depending on the types of percussive piling and the predicted noise impact at NSRs.

4.2.3 Operation Noise

Road Traffic Noise

4.2.3.1 For road traffic noise, the following L_{10(1 hour)} criteria stipulated in Annex 5, Table 1A of EIAO-TM are adopted for different types of noise sensitive receivers (NSRs) which rely on opened windows for ventilation:

· 70 dB(A) at 1 m from the external façades of residential dwellings, hotels, offices;

· 65 dB(A) at 1 m from the external façades of educational institution, places of public worship, courts of law and all others where places where unaided voice communication is required; and

· 55 dB(A) at 1 m from the external façades of hospital and clinics.

Fixed Noise

4.2.3.2 Since the length of the proposed noise full enclosures does not exceed 230m, ventilation system is not required according to the Guidance Notes BS/GN/046B issued by HyD. No fixed plant is expected to be proposed under the Project and as such, fixed noise impact is not anticipated.

4.3 Noise Sensitive Receivers

4.3.1.1 In accordance with Annex 13 of the EIAO-TM, domestic premises (including temporary housing accommodation), hotel and hostels, offices, educational institutions (including kindergartens, nurseries), place of public worship and courts of law, hospitals, clinics, convalescences and homes for the aged, diagnostic rooms, wards are classified as Noise Sensitive Receivers (NSRs).

4.3.1.2 The assessment area for noise impact assessment of the Project is defined as 300m away from the Project works boundary in accordance with Clause 2.2.1(a) and 3.2.1(a), Appendix C of the EIA Study Brief No. ESB-343/2021 and is presented in Figure 4.1a and Figure 4.1b. The representative NSRs within the assessment area for noise impact assessments of the construction and operation phases have been identified based on review of latest information from Planning Department, Lands Department, as well as the latest statutory draft Tsuen Wan Outline Zoning Plan (OZP) S/TW/36 (28.4.2023), draft Kwai Chung OZP No. S/KC/31 (18.11.2022), and other published plans in the vicinity of the Project Site.

4.3.1.3 In order to evaluate the noise impacts during construction and operation phases associated with the Project, representative existing/committed/planned NSRs located within the assessment area have been identified for assessment. Only the first layer of NSRs have been identified for assessment because it would provide acoustic shielding to those receivers at further distance behind.

4.3.1.4 The representative NSRs and Noise Assessment Points (NAP) within the assessment area have been identified and presented in Table 4.3. Their locations are shown in Figure 4.1a and Figure 4.1b and photographs of the existing representative NSRs provided in Appendix 4.1.

4.3.1.5 With reference to the latest Tsuen Wan OZP (S/TW/36), Site TW7 is zoned as Government, Institution or Community (G/IC). During the course of the EIA Study, there were no available building layout plans of the potential school development at this location. Therefore, assessment points have been conservatively selected at the boundary of the Site TW7 for assessment. In the absence of information on the potential school development, it was assumed that the planned NSR has up to 6 floors for the purpose of the assessment.

Table 4.3 Representative Noise Sensitive Receivers

NSR ID	NSR Description	Land Use^(1)	Noise Assessment Point (NAP) ID	No. of Storeys	Construction Noise Impact Assessment^(4)	Road Traffic Noise Impact Assessment^(4)
POCASS	Po On Commercial Association W.S.C Sec School	EI	POCASS1	6	No	Yes
SAK	Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK1	2	No	Yes
	Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK2	2	Yes	Yes
CGE	Clague Garden Estate Block A	R	CGE1	40	No	Yes
	Clague Garden Estate Block A	R	CGE2	40	Yes	Yes
	Clague Garden Estate Block A	R	CGE3	40	No	Yes
	Clague Garden Estate Block A	R	CGE4	40	No	Yes
	Clague Garden Estate Block A	R	CGE5	40	No	Yes
	Clague Garden Estate Block B	R	CGE6	40	No	Yes
	Clague Garden Estate Block B	R	CGE7	40	No	Yes
	Clague Garden Estate Block B	R	CGE8	40	No	Yes
	Clague Garden Estate Block B	R	CGE9	40	No	Yes
	Clague Garden Estate Block C	R	CGE10	40	No	Yes
	Clague Garden Estate Block C	R	CGE11	40	No	Yes
	Clague Garden Estate Block C	R	CGE12	40	No	Yes
	Clague Garden Estate Block C	R	CGE13	40	No	Yes
	Clague Garden Estate Block C	R	CGE14	40	No	Yes
PC	Parc City Tower 3	R	PC1	29	Yes	Yes
	Parc City Tower 5	R	PC2	38	No	Yes
	Parc City Tower 5	R	PC3	38	No	Yes
	Parc City Tower 6	R	PC4	38	No	Yes
VC	Vision City Tower 1	R	VC1	42	No	Yes
	Vision City Tower 1	R	VC2	42	No	Yes
	Vision City Tower 1	R	VC3	42	No	Yes
TD	The Dynasty Tower 2	R	TD1	46	No	Yes
	The Dynasty Tower 2	R	TD2	46	No	Yes
	The Dynasty Tower 2	R	TD3	46	No	Yes
	The Dynasty Tower 1	R	TD4	46	No	Yes
	The Dynasty Tower 1	R	TD5	46	No	Yes
	The Dynasty Tower 1	R	TD6	46	No	Yes
TA	The Aurora Tower 1	R	TA1	31	No	Yes
	The Aurora Tower 1	R	TA2	31	No	Yes
	The Aurora Tower 1	R	TA3	31	No	Yes
SC	Serenade Cove Block B	R	SC1	32	No	Yes
	Serenade Cove Block B	R	SC2	32	Yes	Yes
OP	Ocean Pride Tower 7	R	OP1	41	Yes	Yes
	Ocean Pride Tower 7	R	OP2	41	No	Yes
	Ocean Pride Tower 7	R	OP3	41	No	Yes
	Ocean Pride Tower 8	R	OP4	41	No	Yes
	Ocean Pride Tower 8	R	OP5	41	No	Yes
	Ocean Pride Tower 8	R	OP6	41	No	Yes
	Ocean Pride Tower 9	R	OP7	41	No	Yes
	Ocean Pride Tower 9	R	OP8	41	No	Yes
	Ocean Pride Tower 9	R	OP9	41	No	Yes
	Ocean Pride Tower 10	R	OP10	41	No	Yes
	Ocean Pride Tower 10	R	OP11	41	Yes	Yes
	Ocean Pride Tower 10	R	OP12	41	No	Yes
	Ocean Pride Tower 6	R	OP13	39	No	Yes
	Ocean Pride Tower 6	R	OP14	39	No	Yes
OS	Ocean Supreme Tower 5	R	OS1	38	No	Yes
	Ocean Supreme Tower 5	R	OS2	38	No	Yes
	Ocean Supreme Tower 3	R	OS3	41	No	Yes
	Ocean Supreme Tower 3	R	OS4	41	No	Yes
	Ocean Supreme Tower 2	R	OS5	40	No	Yes
	Ocean Supreme Tower 2	R	OS6	40	No	Yes
	Ocean Supreme Tower 1	R	OS7	41	No	Yes
	Ocean Supreme Tower 1	R	OS8	41	No	Yes
PB	The Pavilia Bay Tower 1	R	PB1	48	No	Yes
	The Pavilia Bay Tower 2	R	PB2	48	No	Yes
CP	City Point Block 1	R	CP1	44	Yes	Yes
	City Point Block 1	R	CP2	44	No	Yes
	City Point Block 2	R	CP3	44	No	Yes
	City Point Block 2	R	CP4	44	No	Yes
	City Point Block 3	R	CP5	44	No	Yes
	City Point Block 3	R	CP6	44	No	Yes
	City Point Block 5	R	CP7	42	No	Yes
	City Point Block 5	R	CP8	42	No	Yes
	City Point Block 6	R	CP9	42	No	Yes
	City Point Block 6	R	CP10	42	No	Yes
	City Point Block 7	R	CP11	40	No	Yes
	City Point Block 8	R	CP12	40	Yes	Yes
	City Point Block 8	R	CP13	40	No	Yes
	City Point Block 8	R	CP14	40	No	Yes
TWPS	Proposed School Site at TW7 (Planned)	EI	TW7PS1	6	Yes	Yes
	Proposed School Site at TW7 (Planned)	EI	TW7PS2	6	No	Yes
SCSMCPS	Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS1	7	No	Yes
	Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS2	7	No	Yes
RG	Hoi Yue Mansion, Riviera Gardens	R	RG1	30	No	Yes
	Hoi Yue Mansion, Riviera Gardens	R	RG2	30	No	Yes
	Hoi Yue Mansion, Riviera Gardens	R	RG3	30	No	Yes
	Hoi Yue Mansion, Riviera Gardens	R	RG4	30	No	Yes
	Hoi Yin Mansion, Riviera Gardens	R	RG5	30	No	Yes
	Hoi Yin Mansion, Riviera Gardens	R	RG6	30	No	Yes
	Hoi Yin Mansion, Riviera Gardens	R	RG7	30	No	Yes
	Hoi Yin Mansion, Riviera Gardens	R	RG8	30	No	Yes
	Hoi Kwai Mansion, Riviera Gardens	R	RG9	30	No	Yes
	Hoi Kwai Mansion, Riviera Gardens	R	RG10	30	No	Yes
	Hoi Kwai Mansion, Riviera Gardens	R	RG11	30	No	Yes
	Hoi Kwai Mansion, Riviera Gardens	R	RG12	30	Yes	Yes
	Hoi Fung Mansion, Riviera Gardens	R	RG13	30	No	Yes
	Hoi Fung Mansion, Riviera Gardens	R	RG14	30	No	Yes
	Hoi Sing Mansion, Riviera Gardens	R	RG15	30	No	Yes
	Hoi Sing Mansion, Riviera Gardens	R	RG16	30	No	Yes
HPT	Tower 1 High Prosperity Terrace	R	HPT	38	No	Yes
KSWE	Kwai Shing West Estate Block 8	R	KSWE1	24	Yes	Yes
	Kwai Shing West Estate Block 9	R	KSWE2	21	No	Yes
LKCSS	Lai King Catholic Secondary School	EI	LKCSS	5	Yes	Yes
LKE	Fung King House, Lai King Estate	R	LKE	22	No	Yes
LIYSS	CNEC Lee I Yao Memorial Secondary School	EI	N/A^(2)	5	N/A^(2)	N/A^(2)
TWC	HKBU Tsuen Wan Campus	EI	N/A^(2)	5	N/A^(2)	N/A^(2)
JUC	Planned Joint-User Complex at Texaco Road	G/IC	N/A^(2)	N/A^(2)	N/A^(2)	N/A^(2)
BGP1^(3)	Belvedere Garden Phase 1	R	N/A^(3)	35	N/A^(3)	N/A^(3)
BGP2^(3)	Belvedere Garden Phase 2	R	N/A^(3)	42	N/A^(3)	N/A^(3)
BGP3^(3)	Belvedere Garden Phase 3	R	N/A^(3)	41	N/A^(3)	N/A^(3)
BCPS^(3)	Hong Kong Baptist Convention Primary School	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
TWGPS^(3)	Tsuen Wan Government Primary School	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
WFCS	Wang Fat Ching She	WP	N/A^(3)	2	N/A^(3)	N/A^(3)
TP	The Panorama	R	N/A^(3)	43	N/A^(3)	N/A^(3)
ST	Summit Terrace	R	N/A^(3)	41	N/A^(3)	N/A^(3)
RSTR	Residential Premises at Sha Tsui Road	R	N/A^(3)	5	N/A^(3)	N/A^(3)
RHWS	Residential Premises at Heung Wo Street	R	N/A^(3)	6 to 23	N/A^(3)	N/A^(3)
MLDH	Moon Lok Dai Ha	R	N/A^(3)	6	N/A^(3)	N/A^(3)
TWP	Tsuen Wan Plaza	R	N/A^(3)	30	N/A^(3)	N/A^(3)
SG	Skyline Garden	R	N/A^(3)	35	N/A^(3)	N/A^(3)
RYUR	Residential Premises at Yeung Uk Road	R	N/A^(3)	5	N/A^(3)	N/A^(3)
CC	Chelsea Court	R	N/A^(3)	54	N/A^(3)	N/A^(3)
HC	H Cube	R	N/A^(3)	39	N/A^(3)	N/A^(3)
IH	Indi Home	R	N/A^(3)	48	N/A^(3)	N/A^(3)
WP	Waterside Plaza	R	N/A^(3)	37	N/A^(3)	N/A^(3)
KYC	Kwai Yung Court, Block 1	R	N/A^(3)	32	N/A^(3)	N/A^(3)
LKFMS	Sir Robert Black College of Education Past Students’ Association Lu Kwong Fai Memorial School	EI	N/A^(3)	8	N/A^(3)	N/A^(3)
CYPS	S.H.K. Chu Yan Primary School	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
LPCS	Sam Shui Natives Association Lau Pun Cheung School	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
LC	Lions College	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
HP	Hibiscus Park	R	N/A^(3)	35	N/A^(3)	N/A^(3)
CWKMS	Lingnan Dr. Chung Wing Kwong Memorial Secondary School	EI	N/A^(3)	7	N/A^(3)	N/A^(3)
WWTS	Planned residential development at Wang Wo Tsai Street	R	N/A^(3)	31	N/A^(3)	N/A^(3)
TWTH	Tsuen Wan Town Hall	G/IC	N/A^(3)	4	N/A^(2)	N/A^(2)
KTT	Kwai Tsing Theatre	T	N/A^(3)	3	N/A^(2)	N/A^(2)
HKCP	Ha Kwai Chung Polyclinic	C	N/A^(3)	6	N/A^(2)	N/A^(2)
NH	Nina Hotel Tsuen Wan West	H	N/A^(2)	77	N/A^(2)	N/A^(2)

Notes:

(1) Residential-R; Educational Institution-EI; Place of Public Worship-WP; Temporary Accommodation-A; Clinic–C; Government, Institution or Community-G/IC; Theatres-T; Hotel-H.

(2) Air-conditioning is provided for the NSR and does not rely on openable window for ventilation, therefore no noise assessment point is assigned.

(3) NAPs would only be selected at Representative NSRs located at the first layer.

(4) “Yes” indicates NSR selected for quantitative noise impact assessment. “No” indicates NSR not selected for quantitative noise impact assessment.

4.4 Identification of Environmental Impacts

4.4.1 Construction Phase

4.4.1.1 The potential sources of noise impact during construction phase of the Project have been identified to be from the use of PME for the various construction activities. The major construction activities to be carried out include site clearance, removal or demolition of existing facilities/structures, excavation works, piling and foundation of the proposed road works. Details of the proposed construction methods and schedule of works are described in Section 2 of this EIA Report.

4.4.1.2 According to Section 2, piling works would be carried out for the foundation works and pile caps and piers. No percussive piling works will be required within the Project Boundary. Alternative piling method (i.e. pre-boring method) has been considered and adopted in lieu of percussive piling method.

4.4.1.3 Based on the proposed construction method presented in Section 2, majority of the Project construction activities will be carried out during non-restricted hours (0700 to 1900, Monday to Saturday). Construction works related to the dismantling of existing parapet and installation of new profile barrier at Tsuen Wan Road will be carried out during non-restricted hours or restricted hours, subject to detail design and in order to minimize disturbance to existing traffic along Tsuen Wan Road.

4.4.1.4 As detailed in Section 2, for the “without Slip Road C” Option, the construction phase of the Project is anticipated to commence in 2028 and be completed by 2033. For the “with Slip Road C” Option, the majority of the construction works will be completed in 2033 with the exception of works at Tsing Tsuen Road and for proposed Slip Road C (connecting Tsing Tsuen Road and Tsuen Wan Road) to commence in 2033 and be completed in 2036, if its implementation is ascertained in the further traffic review. The tentative construction programme for the Project is provided in Appendix 2.1 and Appendix 4.2.

4.4.1.5 As stated in Section 2, and Section 4.1.1.4, the Proposed Columbarium Building at No. 10 Tsing Tsuen Road has been identified as a concurrent project in the vicinity during construction phase of the Project. The construction works are anticipated to commence in Q2 2024 and be completed in Q2 2030. With consideration that the noisy construction activities of the Columbarium Building would be the site formation and foundation works which are anticipated to be substantially completed before construction works for the Project commences in 2028, concurrent works between the two projects could be minimized via efficient and close liaison between HyD’s and BMCPC’s Contractors to minimize construction works to be carried out concurrently at the close proximity areas near Tsuen Wan Road. The proposed construction activities of the Project at Tsing Tsuen Road will commence in 2033 and as such, no potential cumulative impact with the works at this location is expected. With the implementation of this recommendation, cumulative construction noise impact is expected to be minimized. The Project Proponent will further review the cumulative noise impact caused by the Project in the subsequent Construction Noise Mitigation Plan (CNMP) submission at later construction phase to ensure that there is no adverse construction noise impact.

4.4.2 Operation Phase

Road Traffic Noise

4.4.2.1 Road traffic noise impact from the road network within the 300m Noise Study Area, including both “Project roads” and “Existing roads” will be the major noise source during operation phase of the Project. The extent of “Project Roads” for “without Slip Road C” Option is presented in Figure 4.2a and Figure 4.2b. All road sections other than the “Project Roads” as defined above are regarded as “Existing Roads” in the assessment.

Fixed Noise

4.4.2.2 There are no proposed fixed noise sources associated with the Project. No adverse fixed noise impact is expected.

4.5 Assessment Methodology

4.5.1 Construction Phase

Construction Works during Non-Restricted Hours

4.5.1.1 The construction noise impact assessment was undertaken based on standard acoustic principles and will adhere to the procedures stipulated in the GW-TM. The sound pressure level of each construction activity has been calculated, depending on the type and number of plant items and the distance from NSR. The general approach is summarized below:

· Locate the NSRs which would most likely be affected by noise from the Project construction works;

· Determine the items of PME for each discrete construction activity, based on available information or agreed plant inventories;

· Assign sound power levels (SWLs) to the proposed PME according to the GW-TM or other recognized sources of reference, where appropriate;

· Calculate distance attenuation and screening effects to NSRs from notional noise source;

· Apply corrections in the calculations such as potential screening effects and acoustic reflection, if any;

· Predict construction noise levels at NSRs in the absence of any mitigation measures;

· Consider cumulative impact from concurrent projects within 300m of the NSRs, if any; and

· Compare the predicted cumulative construction noise level against the corresponding noise criteria and propose suitable mitigation measures where necessary.

4.5.1.2 The construction programme and zoning arrangement of construction activities are presented in Appendix 4.2 and the plant inventory (including type and quantity of the PME used as well as percentage on time utilization), which has been confirmed by the Project Engineer to be practical and suitable for the proposed works, is presented in Appendix 4.3. The sound power level (SWL) of plant in Table 3 of GW-TM or “Sound power levels of other commonly used PME” (Other PME) published by EPD have been referred to. The SWL of each construction activity has been calculated based on types and quantity of the plant, SWL of plant and percentage on-time utilization.

4.5.1.3 To calculate the sound pressure level of each construction activity, distance attenuation correction has been applied. The distance attenuation was determined by the following formula:

Distance Attenuation in dB(A) = 20 log D + 8

where D is horizontal distance between notional source position of work-front and NSR in metres

4.5.1.4 The following assumptions have been applied in the assessment:

· A +3 dB(A) façade correction was added to the predicted noise levels to account for the façade effect at each identified representative NAP;

· All PME items required for a particular construction activity was assumed to be located at the notional source position, a position mid-way between the approximate geographical centre of the construction site/work-front and its boundary nearest to the NSR, where such activity is to be performed in accordance with the GW-TM;

· Only the dominant portion of the linear site closest to the NSR with a length to width ratio of 5:1 was considered for the purpose of determining the notional source position, when the construction site is linear in shape with a length to width ratio exceeding 5:1 in accordance with the GW-TM;

· As a worst-case assumption, noise impact at the nearest sensitive facades of the residential buildings to the source position was assessed; and

· As a worst-case assumption, noise assessment points of all NSRs were assumed at the same height as the work-fronts.

4.5.1.5 The noise levels at all NSRs are then be predicted by adding up the SPLs of all concurrent construction tasks within the 300m Noise Study Area.

4.5.1.6 The predicted construction noise levels would be compared with the noise standards stated in Section 4.3. Where exceedance of relevant noise standards is predicted, practicable direct noise mitigation measures including the use of quieter PME, movable noise barriers, noise barriers, enclosures and quieter alternative construction methods would be considered. Appropriate correction factors for barrier effect would be adopted in accordance with Section 2.10 of the GW-TM.

Construction Works during Restricted Hours

4.5.1.7 Construction works related to dismantling of existing parapet and installation of new profile barrier at Tsuen Wan Road will be carried out during non-restricted hours and also during restricted hours in order to minimize disturbance to existing traffic along Tsuen Wan Road. The tentative hours for the restricted hour works is not yet confirmed.

4.5.1.8 No Specified Powered Mechanical Equipment (SPME) and Prescribed Construction Work (PCW) as stipulated in the DA-TM for restricted hour work is expected.

4.5.1.9 With reference to the works to be conducted during restricted hours described above, it will be the responsibility of the Contractor to ensure compliance with the NCO and the relevant TMs. In order to avoid potential adverse noise impact and to evaluate whether construction works during restricted hours are feasible or not in the context of programming construction work, an assessment for construction noise during restricted hours will be undertaken. Regardless of the results of the assessment, the Noise Control Authority will process the CNP application, if necessary, based on the NCO, the relevant TMs issued under the NCO, and the actual site conditions at the time of the application. Nothing in this report shall bind EPD in making its decision to issue a CNP. If a CNP is to be issued, EPD will include any conditions considered appropriate and such conditions need to be strictly adhered to while works covered by the CNP is carried out. Failure to comply with the conditions stated in the CNP will lead to its cancellation and prosecution action under the NCO.

4.5.1.10 The construction noise impact assessment during restricted hours will be conducted to evaluate whether the construction works in restricted hours are feasible or not in the context of programming construction work. The assessment methodologies have been stated in Section 4.6.1. It should be noted that educational uses (e.g. NSR SAK2 and LKCSS) have been excluded in the assessment during restricted hours as they are not expected to be used for their intended purposes at those times.

4.5.2 Operation Phase

4.5.2.1 Road traffic noise was assessed adhering strictly to the procedures stipulated in the “Calculation of Road Traffic Noise (CRTN)” (1988) published by Department of Transport, UK. Road traffic noise was presented in terms of noise levels exceeded for 10% of the one-hour period having the peak traffic flow (i.e. L10, 1hour, dB(A)). A 2.5 dB(A) façade reflection and correction factors for effects due to gradient, distance, view angle, road surface and barriers was included in the assessment.

Assessment Year and Determination of Assessment Scenarios

4.5.2.2 Traffic noise was predicted based on the worst-case year traffic forecast within 15 years upon commencement of operation of the Project according to Appendix C of the ESB-343/2021 and Annex 13 of the EIAO-TM. Based on the latest project programme, the Project is expected to commence operation in Year 2033. The assessment year for road traffic noise was taken as Year 2035, which is the maximum traffic projection within 15 years after operation of the Project. The peak hour traffic forecast of “with Project” scenario in Year 2035 is presented in Appendix 4.7a and has been adopted for assessment. Transport Department’s (TD) endorsement on the traffic data is included in Appendix 4.7b.

4.5.2.3 The following scenarios have been studied in the road traffic noise assessment:

· Unmitigated Scenario in Year 2035;

· Mitigated Scenario in Year 2035; and

· Prevailing Scenario in Year 2028 for indirect technical remedies eligibility assessment.

4.5.2.4 With consideration of the scope of the Project, road sections have been classified as the following categories for the purpose of the road traffic noise assessment:

· “Project Roads” which in the context of this report describe all roads that are completely new or are substantially altered by the Project. For the worst case scenario, proposed sections of Tsuen Wan Road/Tsing Tsuen Road/Texaco Road to be widened have been defined as “Project” Roads. All road sections defined in the scope of designated project defined in EIAO are considered as “Project Roads”.

· “Existing” roads which are unchanged or without significant traffic noise impact (i.e. the traffic noise level with the road project would be less than that without the road project at the design year by 1.0 dB(A).

4.5.2.5 For the purpose of the road traffic noise assessment, roads within 300m from the Project boundary have been included in the assessment. Road sections included in the assessment and the extent of Project roads are presented in Figure 4.2a and Figure 4.2b. The characteristics of the road network such as road width, surface type and traffic flow and the use of LNRS, the existing and committed noise mitigation measures have been considered in the assessment. The locations of existing and committed noise mitigation measures (including noise barriers and enclosures) are presented in Figure 4.3a and Figure 4.3b. Locations of existing and committed LNRS are presented in Figure 4.4a and Figure 4.4b.

4.5.2.6 In accordance with the Guidance Note on Road Surface Requirements for Expressways and High Speed Road of the Highways Department, polymer modified friction course (PMFC) has been the standard surfacing material on the road sections with design speed of 70km/h or above without traffic lights and classified as trunk road/high speed road. PMFC has therefore been provided on the road sections with design speed of 70km/h or above. The existing extent of road sections with PMFC is presented in Figure 4.5a and Figure 4.5b.

4.5.2.7 According to the project information for “Flyover from Kwai Tsing Interchange Upramp to Kwai Chung Road” Project on HyD’s website “https://www.hyd.gov.hk/en/our_projects/road_projects/856th/index.html”, its tentative completion year is in 2025. As such, the noise mitigation measures proposed in the approved KTI Upramp to KCR have been considered in the road traffic noise assessment (refer Figure 4.3b).

4.5.2.8 Direct mitigation measures would be proposed for “Project” roads if adverse noise impact is predicted. If the NSRs are affected by noise from existing roads, direct mitigation measures are required to reduce the noise from Project roads to a level that it:

· is not higher than the noise standard; and

· has no significant contribution (less than 1.0 dB(A)) to the cumulative noise level, if the overall noise level (i.e. noise from the new roads together with other existing roads) exceeds the noise standard.

4.5.2.9 According to Clause 4.8 of EIAO Guidance Note No. 12/2010 Road Traffic Noise Impact Assessment and Annex 13 of the EIAO-TM, where the predicted noise impact exceeds the applicable noise criteria and upon exhausting of practicable noise mitigation measures stipulated in Clause 6.1, Annex 13 of the EIAO-TM, indirect technical remedies (ITR) in the form of acoustic insulation and air-conditioning is to be considered as a “last resort” to mitigate the residual noise impact. The eligibility for ITR is suggested to be tested against the following three criteria:

· the predicted overall noise level, L_10(1hour), from the Project roads, together with other traffic noise in the vicinity must be above a respective noise level (for example, 70 dB(A) for domestic premises and 65 dB(A) for educational institutions);

· the predicted overall noise level is at least 1.0 dB(A) more than the prevailing traffic noise level; and

· the contribution to the increase in the predicted overall noise level from the Project roads must be at least 1.0 dB(A).

4.6 Prediction and Evaluation of Environmental Impacts

4.6.1 Construction Noise

Construction Works during Non-Restricted Hours

4.6.1.1 Potential construction noise impacts of the Project during the normal daytime working hours have been assessed at the representative floors of representative NSRs based on the construction programme as shown in Appendix 4.2 and the construction plant inventory presented in Appendix 4.3 during non-restricted hours. The unmitigated noise assessment results are summarized in Table 4.4. Details of the unmitigated construction noise assessment are presented in Appendix 4.5.

Table 4.4 Summary of Unmitigated Construction Noise Assessment Results at Representative NSRs (non-restricted hours)

NSR ID	NSR Description	NAP ID	Noise Criteria, Leq (30-mins), dB(A) ^[1]	Predicted Unmitigated Construction Noise Level Leq (30-mins), dB(A)
SC	Serenade Cove Block B	SC2	75	79-81
SAK	Salvation Army Ng Kok Wai Memorial Kindergarten	SAK2	70	65-86
CGE	Clague Garden Estate Block A	CGE2	75	64-80
PC	Parc City Tower 3	PC1	75	69-79
OP	Ocean Pride Tower 7	OP1	75	67-89
OP	Ocean Pride Tower 10	OP11	75	83-90
CP	City Point Block 1	CP1	75	81-92
CP	City Point Block 8	CP12	75	69-89
RG	Hoi Kwai Mansion, Riviera Gardens	RG12	75	63-88
TWPS	Proposed School Site at TW7 (Planned)	TW7PS1	65/70	71-81
KSWE	Kwai Shing West Estate Block 8	KSWE1	75	65-75
LKCSS	Lai King Catholic Secondary School	LKCSS	65/70	63-71

Notes:

[1] 75 dB(A) for all domestic premises (including temporary housing accommodation) hotels and hostels, 70 dB(A) for educational institution, whereas 65 dB(A) for examination period.

[2] Boldface and underlined values indicate exceedance of noise criteria.

4.6.1.2 Referring to Table 4.4, in the absence of noise mitigation measures, the predicted noise levels at the representative NSRs would be in the range of 63 dB(A) to 92 dB(A). Non-compliance of the construction noise criteria is predicted at some of the representative NSRs. Hence, direct mitigation measures would be required to alleviate some of the potential noise impact on the affected NSRs during construction phase.

Construction Works during Restricted Hours

4.6.1.3 As mentioned in Section 4.5.1.3 works related to the dismantling of existing parapet and installation of new profile barrier at Tsuen Wan Road will be carried out during non-restricted hours and restricted hours. As such, construction noise assessment during restricted hours has also been conducted to evaluate whether the construction works in restricted hours are feasible or not in the context of programming construction work. In order to not pre-empt the Noise Control Authority for issuing a CNP, it should be noted that the assessment results are only indicative.

4.6.1.4 Potential construction noise impacts of the Project during restricted hours have been assessed at the representative NSRs based on the construction programme and works areas as presented in Appendix 4.2 (for Works Area 5) and the construction plant inventory presented in Appendix 4.4. It should be noted that the construction programme and plant inventory adopted are only indicative. The actual construction works during restricted hours will be subject to the detailed design and construction method proposed by the Contractor.

4.6.1.5 The unmitigated noise assessment results for restricted hours at representative NSRs are summarized in Table 4.5. Detailed assessment results for restricted hours are presented in Appendix 4.6. The selected NSRs for this assessment are located in “Urban Area”. These NSRs would have direct line of sight to Tsuen Wan Road / Tsing Tsuen Road and would be directly affected by these roads. Based on the Annual Traffic Census 2021 published by TD, the annual average daily traffic (AADT) of the roads would be more than 30,000 and is considered as an Influencing Factor (IF) according to the TM. Therefore, the ASR for these NSRs is classified as “C”. Referring to Table 4.5, in the absence of noise mitigation measures, the predicted noise levels at the representative NSRs would be in the range of 59 to 78 dB(A). Non-compliance of the construction noise criteria is predicted at some of the representative NSRs. Hence, direct mitigation measures would be required to alleviate the potential noise impact on the affected NSRs during construction phase at restricted hours.

Table 4.5 Summary of Unmitigated Construction Noise Assessment Results at Representative NSRs (Restricted Hours)

NSR ID	NSR Description	NAP ID	Predicted Unmitigated Construction Noise Level Leq (30-mins), dB(A)^(1)(2)
SC	Serenade Cove Block B	SC2	-
CGE	Clague Garden Estate Block A	CGE2	60
PC	Parc City Tower 3	PC1	64
OP	Ocean Pride Tower 7	OP1	63
OP	Ocean Pride Tower 10	OP11	78
CP	City Point Block 1	CP1	76
CP	City Point Block 8	CP12	74
RG	Hoi Kwai Mansion, Riviera Gardens	RG12	58
KSWE	Kwai Shing West Estate Block 8	KSWE1	62

Notes:

(1) “-“ indicates that the restricted hour works are located outside 300m Noise Study Area of the NAP.

(2) Boldface and underlined values indicate exceedance of noise criteria.

4.6.2 Operation Phase – Road Traffic Noise

4.6.2.1 The predicted traffic noise levels at the representative NSRs under the unmitigated scenario for the “without Slip Road C” Option are presented in Table 4.6 while the detailed noise assessment results are presented in Appendix 4.8. The assessment results under the “with Slip Road C” Option are presented in Appendix 4.9.

4.6.2.2 Referring to Table 4.6, in the absence of noise mitigation measures, the predicted noise levels at the representative NSRs would be in the range of 54 dB(A) to 85 dB(A). The predicted maximum "Project Roads" Contribution when overall noise level exceeds traffic noise criteria is ~13 dB(A). Hence, direct noise mitigation measures have been considered to alleviate the predicted adverse traffic noise impact according to Section 4.6.2.8.

Table 4.6 Summary of Predicted Road Traffic Noise Assessment Results under Unmitigated Scenario (Year 2035) – without Slip Road C Option

				Predicted Noise Level, L10(1-hr) dB(A)^(3)(4)(5)
NSR Description	Land Use^(1)	NAP ID^(2)	Noise Criteria, L10(1-hr), dB(A)	Overall	Project Roads	Existing Roads	Max. "Project Roads" Contribution when Overall Noise Level Exceeds Criteria ^(6)(7)	Whether Noise Mitigation Measures on "Project Roads" are required (Y/N)
Po On Commercial Association W.S.C Sec School	EI	POCASS1	65	74-75	44-48	74-75	0.0	N
Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK1	65	70-73	49-52	70-73	0.0	N
Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK2	65	75-77	47-51	75-77	0.1	N
Clague Garden Estate Block A	R	CGE1	70	67-79	48-61	66-79	0.1	N
Clague Garden Estate Block A	R	CGE2	70	66-79	49-62	66-79	0.2	N
Clague Garden Estate Block A	R	CGE3	70	67-79	49-62	67-79	0.2	N
Clague Garden Estate Block A	R	CGE4	70	67-77	50-61	67-77	0.2	N
Clague Garden Estate Block A	R	CGE5	70	68-77	51-62	68-77	0.2	N
Clague Garden Estate Block B	R	CGE6	70	68-77	47-58	68-76	0.1	N
Clague Garden Estate Block B	R	CGE7	70	68-76	47-57	68-76	0.1	N
Clague Garden Estate Block B	R	CGE8	70	67-74	44-54	67-74	0.1	N
Clague Garden Estate Block B	R	CGE9	70	67-74	45-55	67-74	0.1	N
Clague Garden Estate Block C	R	CGE10	70	69-77	43-55	69-77	0.1	N
Clague Garden Estate Block C	R	CGE11	70	70-79	53-65	70-79	0.2	N
Clague Garden Estate Block C	R	CGE12	70	70-79	52-64	70-78	0.2	N
Clague Garden Estate Block C	R	CGE13	70	67-76	46-58	67-76	0.1	N
Clague Garden Estate Block C	R	CGE14	70	68-76	40-44	68-76	0.1	N
Parc City Tower 3	R	PC1	70	70-73	45-48	70-73	0.0	N
Parc City Tower 5	R	PC2	70	72-76	47-51	72-76	0.0	N
Parc City Tower 5	R	PC3	70	68-72	40-61	68-72	0.0	N
Parc City Tower 6	R	PC4	70	69-71	45-47	69-71	0.0	N
Vision City Tower 1	R	VC1	70	62-71	55-61	61-71	0.5	N
Vision City Tower 1	R	VC2	70	64-72	56-63	63-71	0.7	N
Vision City Tower 1	R	VC3	70	63-70	52-61	62-70	-	N
The Dynasty Tower 2	R	TD1	70	69-71	68-70	62-63	8.8	Y
The Dynasty Tower 2	R	TD2	70	69-71	68-70	61-63	8.4	Y
The Dynasty Tower 2	R	TD3	70	69-71	68-70	61-63	9.0	Y
The Dynasty Tower 1	R	TD4	70	69-71	69-71	61-63	8.9	Y
The Dynasty Tower 1	R	TD5	70	70-71	69-71	62-63	9.0	Y
The Dynasty Tower 1	R	TD6	70	70-72	69-71	62-63	9.2	Y
The Aurora Tower 1	R	TA1	70	68-70	61-69	62-67	-	N
The Aurora Tower 1	R	TA2	70	65-69	60-68	60-63	-	N
The Aurora Tower 1	R	TA3	70	64-69	60-68	60-61	-	N
Serenade Cove Block B	R	SC1	70	72-75	48-50	72-75	0.1	N
Serenade Cove Block B	R	SC2	70	71-73	47-50	71-73	0.1	N
Ocean Pride Tower 7	R	OP1	70	70-75	55-61	70-75	0.2	N
Ocean Pride Tower 7	R	OP2	70	69-74	54-59	69-73	0.2	N
Ocean Pride Tower 7	R	OP3	70	69-73	54-59	69-73	0.2	N
Ocean Pride Tower 8	R	OP4	70	70-76	46-55	70-76	0.0	N
Ocean Pride Tower 8	R	OP5	70	68-73	57-61	68-72	0.4	N
Ocean Pride Tower 8	R	OP6	70	65-69	50-54	65-69	-	N
Ocean Pride Tower 9	R	OP7	70	70-75	59-65	69-75	0.4	N
Ocean Pride Tower 9	R	OP8	70	70-75	49-53	70-75	0.0	N
Ocean Pride Tower 9	R	OP9	70	68-73	44-51	68-73	0.0	N
Ocean Pride Tower 10	R	OP10	70	70-76	40-45	70-76	0.0	N
Ocean Pride Tower 10	R	OP11	70	70-75	65-70	68-74	1.7	Y
Ocean Pride Tower 10	R	OP12	70	67-74	65-71	61-70	4.5	Y
Ocean Pride Tower 6	R	OP13	70	69-72	53-56	69-71	0.1	N
Ocean Pride Tower 6	R	OP14	70	68-71	53-56	68-71	0.1	N
Ocean Supreme Tower 5	R	OS1	70	63-66	45-58	63-66	-	N
Ocean Supreme Tower 5	R	OS2	70	64-70	48-54	64-70	-	N
Ocean Supreme Tower 3	R	OS3	70	55-68	54-66	50-64	-	N
Ocean Supreme Tower 3	R	OS4	70	64-70	52-64	64-69	-	N
Ocean Supreme Tower 2	R	OS5	70	60-66	-	60-66	-	N
Ocean Supreme Tower 2	R	OS6	70	61-71	50-63	61-70	0.8	N
Ocean Supreme Tower 1	R	OS7	70	55-69	49-64	53-67	-	N
Ocean Supreme Tower 1	R	OS8	70	61-69	60-68	46-60	-	N
The Pavilia Bay Tower 1	R	PB1	70	54-75	52-75	51-64	11.4	Y
The Pavilia Bay Tower 2	R	PB2	70	69-74	67-74	63-66	9.6	Y
City Point Block 1	R	CP1	70	69-74	68-73	62-67	7.2	Y
City Point Block 1	R	CP2	70	70-76	70-75	62-63	12.6	Y
City Point Block 2	R	CP3	70	67-72	67-72	57-59	13.4	Y
City Point Block 2	R	CP4	70	67-73	66-72	60-61	12.0	Y
City Point Block 3	R	CP5	70	68-73	68-73	59-60	13.1	Y
City Point Block 3	R	CP6	70	68-73	67-72	60-62	10.9	Y
City Point Block 5	R	CP7	70	68-74	68-74	60-61	12.6	Y
City Point Block 5	R	CP8	70	67-71	66-70	59-62	8.8	Y
City Point Block 6	R	CP9	70	68-73	67-72	58-60	12.3	Y
City Point Block 6	R	CP10	70	69-73	67-72	65-67	6.3	Y
City Point Block 7	R	CP11	70	69-73	68-73	59-62	11.6	Y
City Point Block 8	R	CP12	70	74-76	69-72	72-73	2.6	Y
City Point Block 8	R	CP13	70	74-75	66-69	73-74	1.2	Y
City Point Block 8	R	CP14	70	73-74	65-67	72-73	1.1	Y
Proposed School Site at TW7	EI	TW7PS1	65	59-73	53-66	57-73	1.9	Y
Proposed School Site at TW7	EI	TW7PS2	65	65-73	52-64	65-72	1.0	Y
Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS1	65	68-70	53-59	68-69	0.5	N
Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS2	65	71-71	49-57	70-71	0.2	N
Hoi Yue Mansion, Riviera Gardens	R	RG1	70	73-74	61-68	72-73	1.4	Y
Hoi Yue Mansion, Riviera Gardens	R	RG2	70	73	62-68	72-73	1.6	Y
Hoi Yue Mansion, Riviera Gardens	R	RG3	70	67-71	46-54	67-71	0.1	N
Hoi Yue Mansion, Riviera Gardens	R	RG4	70	69-73	58-64	69-72	0.6	N
Hoi Yin Mansion, Riviera Gardens	R	RG5	70	69-73	61-66	69-72	1.0	Y
Hoi Yin Mansion, Riviera Gardens	R	RG6	70	69-72	61-66	69-71	1.2	Y
Hoi Yin Mansion, Riviera Gardens	R	RG7	70	63-72	41-45	63-72	0.1	N
Hoi Yin Mansion, Riviera Gardens	R	RG8	70	68-73	55-60	67-72	0.3	N
Hoi Kwai Mansion, Riviera Gardens	R	RG9	70	68-73	60-64	67-72	0.6	N
Hoi Kwai Mansion, Riviera Gardens	R	RG10	70	67-72	59-64	67-72	0.7	N
Hoi Kwai Mansion, Riviera Gardens	R	RG11	70	65-74	-	65-74	0.0	N
Hoi Kwai Mansion, Riviera Gardens	R	RG12	70	65-75	-	65-75	0.0	N
Hoi Fung Mansion, Riviera Gardens	R	RG13	70	62-75	-	62-75	0.0	N
Hoi Fung Mansion, Riviera Gardens	R	RG14	70	61-74	-	61-74	0.0	N
Hoi Sing Mansion, Riviera Gardens	R	RG15	70	61-75	-	61-75	0.0	N
Hoi Sing Mansion, Riviera Gardens	R	RG16	70	60-75	-	60-75	0.0	N
Tower 1 High Prosperity Terrace	R	HPT	70	70-71	-	70-71	0.0	N
Kwai Shing West Estate Block 8	R	KSWE1	70	67-71	-	67-71	0.0	N
Kwai Shing West Estate Block 9	R	KSWE2	70	71-72	-	71-72	0.0	N
Lai King Catholic Secondary School	EI	LKCSS	65	79-81	-	79-81	0.0	N
Fung King House	R	LKE	70	82-85	-	82-85	0.0	N

Notes:

(1) Residential – R, Educational Institution – EI.

(2) The assessment only includes NSRs which rely on opened windows for ventilation.

(3) Boldfaced and underlined values indicate exceedance of relevant noise criteria.

(4) Noise levels is rounded up to nearest integer to determine the compliance of the criteria.

(5) Noise level below 40 dB(A) would be considered negligible and hence not shown in the table and presented as “-“.

(6) “-“ Predicted overall noise level complied with noise criteria under unmitigated scenario.

(7) Maximum Project Road contribution for NSRs with overall noise level exceeding relevant criteria.

4.7 Mitigation of Environmental Impacts

4.7.1 Construction Phase

Construction Noise during non-restricted hours

4.7.1.1 In order to reduce the noise impact at the affected NSRs during non-restricted hours, mitigation measures such as adopting quiet PME, movable noise barriers and temporary noise barriers is recommended. The Contractor(s) may be able to obtain particular models of plant that are quieter than the PMEs given in GW-TM. It is considered too restrictive to specify that a Contractor has to use specific items of plant for the construction operations. It is practical to specify the total SWL of all plant to be used on site so that the Contractor has the flexibility to select plant to suit his needs.

4.7.1.2 The use of quality PME associated with the construction works is prescribed in EPD’s Quality Powered Mechanical Equipment (QPME) database, which contains the SWLs for quality/quiet PME of various types, brands and models. The SWLs for quality PMEs adopted for construction noise assessment during non-restricted hours are detailed in Appendix 4.10.

4.7.1.3 To alleviate the construction noise impact on the affected NSRs, movable noise barriers and barriers have been proposed for excavator, saw (circular wood), mobile crane, loader, lorry, air compressor, drilling rig, grout mixer, grout pump, water pump (submersible), drill rig, dump truck, concrete lorry mixer, concrete mixer, concrete pump, poker (vibratory hand held), hydraulic crusher, lorry, silent piling by press in method, bar bender and cutter (electric), mobile crawler crane (diesel), asphalt paver, vibratory roller, paint line marker, hand held concrete crusher, dump truck with grab, cherry picker and welding set. Movable noise barriers and barriers that can be located close to noisy plant and be moved iteratively with the plant along a worksite can be very effective for screening noise from NSRs. The barrier material of movable noise barriers and barriers should have at least 7 kg/m² surface density. A typical configuration of movable noise barriers, barriers and portable noise enclosure is shown in Appendix 4.14. The measure is particularly effective for low level zone of NSRs. A cantilevered top cover would be required to achieve screening benefits at upper floors of NSRs. It is anticipated that suitably designed barriers could achieve at least 5-10 dB(A) reduction.

4.7.1.4 The use of full enclosure has been considered in this assessment to shelter relatively static plant including generator (silenced) and concrete pump. This type of enclosure is expected to provide approximately 15 dB(A) noise reduction.

4.7.1.5 Quieter construction method such as silent piling by press-in method is adopted as an alternative of traditional sheet piling. A sheet pile is clipped and pressed under the ground. Noise can be minimized by press-in sheet piles with drilling simultaneously for piling works at harder ground. The noise impact can also be further reduced as the piling works can be completed within the shorter duration by using this method.

4.7.1.6 The use of hydraulic breaker for rock or concrete breaking would inevitably generate high level of noise as operation principle of hydraulic breaker is by percussive striking actions of its chisels. As confirmed by Project engineer, it is feasible to adopt quieter rock or concrete breaking equipment (e.g. hand held concrete crusher) in some activities as a mitigation measure. These quieter rock breaking equipment would create less noise impact to NSRs. The Contractor should, subject to the actual site conditions, proactively adopt quieter rock breaking equipment and hydraulic crusher to carry out the demolition / excavation works, where practicable.

4.7.1.7 Noise reduction from the use of mitigation measures such as quiet plant, temporary noise barrier and enclosure for construction plant as described above have been applied in the assessment. The mitigation measures have been confirmed with the Project Engineer to be practicable and suitable for the construction programme. The construction plant inventory adopted is presented in Appendix 4.10 while detailed construction noise calculations and results for the mitigated scenario are presented in Appendix 4.12. A summary of the predicted cumulative noise levels at the representative floor of representative NSRs is presented in Table 4.7.

Table 4.7 Summary of Mitigated Construction Noise Assessment Results at Representative NSRs (non-restricted hours)

NSR ID	NSR Description	NAP ID	Noise Criteria, Leq (30-mins), dB(A) ^[1]	Predicted Mitigated Construction Noise Level Leq (30-mins), dB(A)
SC	Serenade Cove Block B	SC2	75	58-64
SAK	Salvation Army Ng Kok Wai Memorial Kindergarten	SAK2	70	44-69
CGE	Clague Garden Estate Block A	CGE2	75	43-63
PC	Parc City Tower 3	PC1	75	49-62
OP	Ocean Pride Tower 7	OP1	75	46-71
OP	Ocean Pride Tower 10	OP11	75	62-73
CP	City Point Block 1	CP1	75	60-75
CP	City Point Block 8	CP12	75	48-72
RG	Hoi Kwai Mansion, Riviera Gardens	RG12	75	42-72
TWPS	Proposed School Site at TW7 (Planned)	TW7PS1	65/70	50-64
KSWE	Kwai Shing West Estate Block 8	KSWE1	75	44-59
LKCSS	Lai King Catholic Secondary School	LKCSS	65/70	42-54

Notes:

[1] 75 dB(A) for all domestic premises (including temporary housing accommodation) hotels and hostels, 70 dB(A) for educational institution, whereas 65 dB(A) for examination period.

[2] Exceedance would be observed during examination period.

[3] Boldface and underlined values indicate exceedance of noise criteria.

4.7.1.8 As shown in Appendix 4.12, with the adoption of quiet plant, movable noise barriers, temporary noise barriers and enclosure, the predicted construction noise levels arising from the Project at all NSRs selected for the construction noise impact assessment would comply with the EIAO-TM construction noise criteria.

Construction Noise during restricted hours

4.7.1.9 Adoption of quiet PMEs and movable noise barriers and temporary noise barriers are recommended to alleviate the excessive noise impact at the affected NSRs during restricted hours. The Contractor(s) may be able to obtain particular models of plant that are quieter than the PMEs given in GW-TM. It is considered restrictive to specify that a Contractor has to use specific items of plant for the construction operations. It is practical to specify the total SWL of all plant to be used on site so that the Contractor has the flexibility to select plant to suit his needs.

4.7.1.10 The use of QPME associated with the construction works is prescribed in EPD’s Quality Powered Mechanical Equipment (QPME) database, which contains the SWLs for quality/quiet PME of various types, brands and models. The SWLs for quality PMEs adopted for the construction noise assessment during restricted hours are detailed in Appendix 4.11.

4.7.1.11 To alleviate the construction noise impact on the affected NSRs, movable noise barriers have been proposed for excavator wheeled/tracked, mobile crane, loader wheeled, hydraulic crusher, dump truck, dump truck with grab, mobile crawler crane, vibratory roller, paint line marker and cherry picker. As stated in Section 4.8.1.3, a typical configuration of noise barrier and portable noise enclosure is shown in Appendix 4.14. It is anticipated that suitable designed barriers could achieve at least 5 – 10 dB(A) reduction.

4.7.1.12 The use of full enclosure has been considered in this assessment to shelter relatively static plant including generator (silenced). This type of enclosure is expected to provide approximately 15 dB(A) noise reduction.

4.7.1.13 Noise reduction from the use of mitigation measures such as quiet plant, movable noise barrier/barrier and enclosure for construction plant as described above have been applied in the assessment. The mitigation measures have been confirmed with the Project Engineer to be practicable and suitable for the construction programme. The construction plant inventory adopted is presented in Appendix 4.11 while detailed construction noise calculations and results for the mitigated scenario during restricted hours are presented in Appendix 4.13. A summary of the predicted cumulative noise levels at the representative NSRs is presented in Table 4.8.

Table 4.8 Summary of Mitigated Construction Noise Assessment Results at Representative NSRs (restricted hours)

NSR ID	NSR Description	NAP ID	Predicted Mitigated Construction Noise Level Leq (30-mins), dB(A)
SC	Serenade Cove Block B	SC2	-
CGE	Clague Garden Estate Block A	CGE2	34
PC	Parc City Tower 3	PC1	37
OP	Ocean Pride Tower 7	OP1	37
OP	Ocean Pride Tower 10	OP11	51
CP	City Point Block 1	CP1	50
CP	City Point Block 8	CP12	48
RG	Hoi Kwai Mansion, Riviera Gardens	RG12	32
KSWE	Kwai Shing West Estate Block 8	KSWE1	35

Notes:

(1) “-“ indicates that the restricted hour works are located outside 300m Noise Study Area of the NAP.

(2) Boldface and underlined values indicate exceedance of noise criteria.

4.7.1.14 With the implementation of the abovementioned mitigation measures, no adverse construction noise impact during restricted hours is anticipated at the NSRs due to the Project.

4.7.2 Operation Phase – Road Traffic Noise

4.7.2.1 With reference to Annex 13 of the EIAO-TM, where the predicted noise impacts exceed the applicable noise criteria, direct mitigation measures such as alternative land use, alternative siting, screening by noise tolerant buildings, etc. shall be considered and evaluated in an appropriate manner. As the Project will not include land use planning or development, alternative land use arrangement and orientation of buildings are not considered feasible.

4.7.2.2 Standard surfacing materials (e.g. Highly modified friction course or PMFC as appropriate), which is also low noise road surfacing, would be provided for the widened road sections in accordance with the latest Guidance Notes on Road Surface Requirements for Expressways and High Speed Road of the Highways Department. The extent of road sections provided with standard surfacing materials in accordance with the Guidance Notes on Road Surface Requirements for Expressways and High Speed Road of the Highways Department is presented in Figure 4.5a and Figure 4.5b.

4.7.2.3 Direct noise mitigation measures would be provided as far as practicable until the mitigated overall noise levels comply with the relevant standards or the mitigated noise levels from the Project roads do not exceed the relevant standards and does not contribute to the overall noise levels by 1.0 dB(A) or more. Hence, direct noise mitigation measures as listed below are proposed to alleviate adverse traffic noise impact on the affected NSRs. LNRS has been applied for Project road sections with design speed of 70km/h or above.

· LNRS on certain Project Road sections;

· Vertical noise barrier and cantilevered noise barrier;

· Semi-Enclosure; and

· Full Enclosure.

4.7.2.4 Details of the proposed noise mitigation measures (e.g. noise barriers, semi-enclosure and full enclosure) for “without Slip Road C” Option are summarized in below Table 4.9 and their locations presented in Figure 4.5a and Figure 4.5b. All the proposed barriers shall be designed and constructed to comply with the “Guidelines on Design of Noise Barriers” published by the Environmental Protection Department (EPD) and HyD. The proposed noise mitigation measures under “with Slip Road C” Option are presented in Appendix 4.9.

Table 4.9 Extent and Locations of Proposed Noise Barriers, Semi-Enclosure and Full Enclosure

ID	Barrier Type	Height, m	Approximate Length, m	Concerned NSR ID	Figure
N1	Cantilever	6.5m (H) with 3.5m cantilever at 45 degrees	100	CP, RG	Figure 4.5b
FE1	Full Enclosure	-	94	OP	Figure 4.5a
FE2		With 3.5m cantilever	177	PB, TD	Figure 4.5a
SE1	Semi-Enclosure	-	470	CP, PB, RG	Figure 4.5a & 4.5b

4.7.2.5 With the implementation of the recommended noise mitigation measures, including LNRS, noise barriers, semi-enclosure and full enclosure, the noise levels at some of the representative NSRs would comply with the traffic noise criteria. However, exceedance of the traffic noise level would still be predicted at some of the representative NSRs due to existing roads while contributions from the Project roads to the overall noise levels at all NSRs are predicted to be less than 1.0 dB(A). Therefore, additional noise mitigation measures are considered not required. The predicted overall noise levels under the mitigated scenario for “without Slip Road C” Option are summarized in Table 4.10 and detailed in Appendix 4.15. A summary of the predicted noise levels under mitigated scenario for “with Slip Road C” Option is presented in Appendix 4.9.

Table 4.10 Summary of Predicted Road Traffic Noise Assessment Results under Mitigated Scenario (Year 2035) without Slip Road C Option

NSR Description	Land Use^(1)	NAP ID^(2)	Noise Criteria, L10(1-hr), dB(A)	Predicted Noise Level, L10(1-hr) dB(A)^(3)(4)(5)				Whether Additional Noise Mitigation Measures on "Project Roads" are required (Y/N)
				Overall	Project Roads	Existing Roads	Max. "Project Roads" Contribution when Overall Noise Level Exceeds Criteria^(6)(7)
Po On Commercial Association W.S.C Sec School	EI	POCASS1	65	74-75	44-48	74-75	0.0	N
Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK1	65	70-73	49-52	70-73	0.0	N
Salvation Army Ng Kok Wai Memorial Kindergarten	EI	SAK2	65	75-77	47-51	75-77	0.1	N
Clague Garden Estate Block A	R	CGE1	70	67-79	48-61	66-79	0.1	N
Clague Garden Estate Block A	R	CGE2	70	66-79	48-62	66-79	0.1	N
Clague Garden Estate Block A	R	CGE3	70	67-79	48-62	67-79	0.1	N
Clague Garden Estate Block A	R	CGE4	70	67-77	48-59	67-77	0.1	N
Clague Garden Estate Block A	R	CGE5	70	68-77	49-60	68-77	0.1	N
Clague Garden Estate Block B	R	CGE6	70	68-77	47-58	68-76	0.1	N
Clague Garden Estate Block B	R	CGE7	70	68-76	47-57	68-76	0.1	N
Clague Garden Estate Block B	R	CGE8	70	67-74	44-54	67-74	0.1	N
Clague Garden Estate Block B	R	CGE9	70	67-74	45-55	67-74	0.1	N
Clague Garden Estate Block C	R	CGE10	70	69-77	43-55	69-77	0.1	N
Clague Garden Estate Block C	R	CGE11	70	70-79	43-55	70-79	0.1	N
Clague Garden Estate Block C	R	CGE12	70	70-78	42-54	70-78	0.1	N
Clague Garden Estate Block C	R	CGE13	70	67-76	-	67-76	0.0	N
Clague Garden Estate Block C	R	CGE14	70	68-76	41-43	68-76	0.1	N
Parc City Tower 3	R	PC1	70	70-73	45-48	70-73	0.0	N
Parc City Tower 5	R	PC2	70	72-76	47-51	72-76	0.0	N
Parc City Tower 5	R	PC3	70	68-72	40-57	68-72	0.0	N
Parc City Tower 6	R	PC4	70	69-71	45-47	69-71	0.0	N
Vision City Tower 1	R	VC1	70	61-71	43-53	61-71	0.1	N
Vision City Tower 1	R	VC2	70	63-71	44-56	63-71	0.2	N
Vision City Tower 1	R	VC3	70	62-70	43-56	62-70	-	N
The Dynasty Tower 2	R	TD1	70	68-70	66-69	61-63	-	N
The Dynasty Tower 2	R	TD2	70	68-70	67-69	61-63	-	N
The Dynasty Tower 2	R	TD3	70	68-70	67-69	60-63	-	N
The Dynasty Tower 1	R	TD4	70	68-70	67-69	61-63	-	N
The Dynasty Tower 1	R	TD5	70	69-70	68-69	62-63	-	N
The Dynasty Tower 1	R	TD6	70	69-70	68-70	62-62	-	N
The Aurora Tower 1	R	TA1	70	68-69	60-68	62-67	-	N
The Aurora Tower 1	R	TA2	70	65-68	59-67	60-63	-	N
The Aurora Tower 1	R	TA3	70	63-68	59-67	59-61	-	N
Serenade Cove Block B	R	SC1	70	72-75	48-50	72-75	0.1	N
Serenade Cove Block B	R	SC2	70	71-73	47-50	71-73	0.1	N
Ocean Pride Tower 7	R	OP1	70	70-75	55-61	70-75	0.2	N
Ocean Pride Tower 7	R	OP2	70	69-74	54-59	69-73	0.2	N
Ocean Pride Tower 7	R	OP3	70	69-73	54-59	69-73	0.2	N
Ocean Pride Tower 8	R	OP4	70	70-76	46-55	70-76	0.0	N
Ocean Pride Tower 8	R	OP5	70	68-72	-	68-72	0.0	N
Ocean Pride Tower 8	R	OP6	70	65-69	-	65-69	-	N
Ocean Pride Tower 9	R	OP7	70	69-75	40-51	69-75	0.1	N
Ocean Pride Tower 9	R	OP8	70	70-75	49-53	70-75	0.0	N
Ocean Pride Tower 9	R	OP9	70	68-73	44-51	68-73	0.0	N
Ocean Pride Tower 10	R	OP10	70	70-76	40-45	70-76	0.0	N
Ocean Pride Tower 10	R	OP11	70	69-74	56-62	68-74	0.6	N
Ocean Pride Tower 10	R	OP12	70	62-71	55-64	61-70	0.9	N
Ocean Pride Tower 6	R	OP13	70	69-72	53-56	69-71	0.1	N
Ocean Pride Tower 6	R	OP14	70	68-71	53-56	68-71	0.1	N
Ocean Supreme Tower 5	R	OS1	70	63-66	44-57	63-66	-	N
Ocean Supreme Tower 5	R	OS2	70	64-70	48-54	64-70	-	N
Ocean Supreme Tower 3	R	OS3	70	53-66	51-62	50-64	-	N
Ocean Supreme Tower 3	R	OS4	70	64-69	50-61	64-69	-	N
Ocean Supreme Tower 2	R	OS5	70	60-66	-	60-66	-	N
Ocean Supreme Tower 2	R	OS6	70	61-70	40-53	61-70	-	N
Ocean Supreme Tower 1	R	OS7	70	53-67	41-47	53-67	-	N
Ocean Supreme Tower 1	R	OS8	70	58-67	58-66	46-60	-	N
The Pavilia Bay Tower 1	R	PB1	70	53-70	49-70	51-64	-	N
The Pavilia Bay Tower 2	R	PB2	70	64-68	47-66	63-65	-	N
City Point Block 1	R	CP1	70	66-68	59-65	62-67	-	N
City Point Block 1	R	CP2	70	63-64	56-59	62-63	-	N
City Point Block 2	R	CP3	70	61-63	57-61	57-59	-	N
City Point Block 2	R	CP4	70	61-63	57-60	60-61	-	N
City Point Block 3	R	CP5	70	61-62	56-58	59-60	-	N
City Point Block 3	R	CP6	70	63-66	60-64	60-62	-	N
City Point Block 5	R	CP7	70	61-62	54-56	60-61	-	N
City Point Block 5	R	CP8	70	62-65	58-62	59-62	-	N
City Point Block 6	R	CP9	70	60-63	56-61	58-60	-	N
City Point Block 6	R	CP10	70	66-69	60-64	65-67	-	N
City Point Block 7	R	CP11	70	63-67	61-65	59-62	-	N
City Point Block 8	R	CP12	70	73	62-64	72-73	0.5	N
City Point Block 8	R	CP13	70	73-74	59-64	73-74	0.5	N
City Point Block 8	R	CP14	70	73	58-64	72-73	0.6	N
Proposed School Site at TW7	EI	TW7PS1	65	57-73	44-57	57-73	0.2	N
Proposed School Site at TW7	EI	TW7PS2	65	65-72	44-55	65-72	0.2	N
Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS1	65	68-69	40-40	68-69	0.1	N
Shak Chung Shan Memorial Catholic Primary School	EI	SCSMCPS2	65	70-71	40-42	70-71	0.0	N
Hoi Yue Mansion, Riviera Gardens	R	RG1	70	72-73	52-60	72-73	0.3	N
Hoi Yue Mansion, Riviera Gardens	R	RG2	70	72-73	52-60	72-73	0.3	N
Hoi Yue Mansion, Riviera Gardens	R	RG3	70	67-71	48-54	67-71	0.1	N
Hoi Yue Mansion, Riviera Gardens	R	RG4	70	69-72	50-56	69-72	0.1	N
Hoi Yin Mansion, Riviera Gardens	R	RG5	70	69-72	52-57	69-72	0.2	N
Hoi Yin Mansion, Riviera Gardens	R	RG6	70	69-71	52-57	69-71	0.2	N
Hoi Yin Mansion, Riviera Gardens	R	RG7	70	63-72	40-43	63-72	0.1	N
Hoi Yin Mansion, Riviera Gardens	R	RG8	70	67-72	44-50	67-72	0.1	N
Hoi Kwai Mansion, Riviera Gardens	R	RG9	70	68-72	48-52	67-72	0.1	N
Hoi Kwai Mansion, Riviera Gardens	R	RG10	70	67-72	48-52	67-72	0.1	N
Hoi Kwai Mansion, Riviera Gardens	R	RG11	70	65-74	-	65-74	0.0	N
Hoi Kwai Mansion, Riviera Gardens	R	RG12	70	65-75	-	65-75	0.0	N
Hoi Fung Mansion, Riviera Gardens	R	RG13	70	62-75	-	62-75	0.0	N
Hoi Fung Mansion, Riviera Gardens	R	RG14	70	61-74	-	61-74	0.0	N
Hoi Sing Mansion, Riviera Gardens	R	RG15	70	61-75	-	61-75	0.0	N
Hoi Sing Mansion, Riviera Gardens	R	RG16	70	60-75	-	60-75	0.0	N
Tower 1 High Prosperity Terrace	R	HPT	70	70-71	-	70-71	0.0	N
Kwai Shing West Estate Block 8	R	KSWE1	70	67-71	-	67-71	0.0	N
Kwai Shing West Estate Block 9	R	KSWE2	70	71-72	-	71-72	0.0	N
Lai King Catholic Secondary School	EI	LKCSS	65	79-81	-	79-81	0.0	N
Fung King House	R	LKE	70	82-85	-	82-85	0.0	N

Notes:

(1) Residential – R, Educational Institution – EI.

(2) The assessment only includes NSRs which rely on opened windows for ventilation.

(3) Boldfaced and underlined values indicate exceedance of relevant noise criteria.

(4) Noise levels would be rounded up to nearest integer to determine the compliance of the criteria.

(5) Noise level below 40 dB(A) would be considered negligible and hence not shown in the table and presented as “-“.

(6) “-“ Predicted overall noise level complied with noise criteria under unmitigated scenario.

(7) Maximum Project Road contribution for NSRs with overall noise level exceeding relevant criteria.

4.7.2.6 With reference to Clause 3.4.1(b) of Appendix C of the EIA Study Brief, the estimated total number of dwellings and other existing NSRs that will be benefitted and protected are summarized in Table 4.11.

Table 4.11 Number of residential dwellings/rooms benefited and protected under Mitigated Scenario (without Slip Road C Option)

Description	No. of Existing Residential Dwellings	No. of Existing Classrooms	No. of Other Existing NSRs (Place of Public Worship, Accommodation / Hostel, Clinic / Home for the aged)	Total
Benefited	1492	0	0	1492
Protected	859	0	0	859

Notes:

[1] No planned Place of Public Worship, Accommodation / hostel under this study.

[2] Benefited – Noise reduction of 1.0 dB(A) or greater in overall noise level with the noise mitigation measures in place

[3] Protected – Overall noise level not greater than relevant noise criteria with the noise mitigation measures in place

4.7.2.7 With reference to Clause 3.3.2(c), Appendix C of the EIA Study Brief, the estimated total number of dwellings, classrooms and other noise sensitive receivers that will be exposed to noise impact exceeding the respective criteria are presented in Table 4.12. Details for “with Slip Road C” Option are presented in Appendix 4.9.

Table 4.12 Estimated number of dwellings, classrooms and other NSRs exposed to exceedance (without Slip Road C Option)

Scenario	Estimated Number Exposed to Exceedance
	No. of Existing Residential Dwellings	No. of Existing Classrooms	No. of Other Existing NSRs (Place of Public Worship, Accommodation / Hostel, Clinic / Home for the aged)	Total
Unmitigated in 2035	3,568	173	0	3,741
Mitigated in 2035	2,709	173	0	2,882
Prevailing in 2028	3,572	173	0	3,745

4.7.2.8 The proposed project without any noise mitigation measures under “without Slip Road C” Option will slightly increase the number of existing dwellings, classrooms and other NSRs along the Project to be exposed to excessive traffic noise by 859 (i.e. 3,741). Upon exhausting all practicable direct noise mitigation measures, it is estimated that the number of dwellings, classrooms and other NSRs exposed to exceedance will be 2,882 under without Slip Road C Option. These NSRs exposed to exceedance are due to the traffic noise from other existing roads. Details for “with Slip Road C” Option are presented in Appendix 4.9.

4.8 Evaluation of Residual Impact

4.8.1 Construction Phase

Construction Works during Non-Restricted Hours

4.8.1.1 The construction noise levels at all NSRs would comply with the noise standards stipulated in EIAO-TM with the implementation of the mitigation measures as mentioned in Section 4.8.1. Residual noise impacts are not anticipated.

Construction Works during Restricted Hours

4.8.1.2 The construction noise impact assessment during restricted hours has been conducted to evaluate whether the construction works in restricted hours are feasible or not in the context of programming construction work. With reference to the mitigated noise assessment results for restricted hours (refer to Appendix 4.13), the results show that the predicted noise level at all representative NSRs comply with the relevant construction noise criteria during restricted hours. Adverse construction noise impact during restricted hours is not anticipated and residual noise impact is not expected.

4.8.2 Operation Phase

Road Traffic Noise

4.8.2.1 With the implementation of all the proposed direct noise mitigation measures, the Project road noise contribution to the overall noise levels at all NSRs would be less than 1.0 dB(A) and the Project road noise levels would all be below the relevant noise criteria. Adverse road traffic noise impact on existing and planned NSRs is not anticipated.

4.9 Environmental Monitoring and Audit

4.9.1 Construction Phase

4.9.1.1 An EM&A programme during construction phase is recommended to be established. With reference to Appendix 4.5, construction noise exceedances at the representative NSRs are predicted during construction of the Project under unmitigated scenario. Thus, construction noise monitoring is recommended. A construction noise management plan, aiming to verify the inventory of noise sources, and to assess the effectiveness and practicality of all identified measures for mitigating the construction noise impact of the project, would be prepared to submit during pre-tender stage, if any, and before the commencement of the project to demonstrate that the quiet construction methods and equipment can be duly specified and implemented for the corresponding noisy construction activities. Regular site environmental audit during construction phase is recommended to ensure proper implementation of mitigation measures and good site practices. Details of the EM&A programme are provided in a stand-alone EM&A Manual.

4.9.2 Operation Phase

4.9.2.1 No adverse traffic noise impact is anticipated with the proposed mitigation measures in place. Road traffic noise levels should be monitored at representative NSRs which are in the vicinity of the recommended direct mitigation measures during the first year after road opening. The purpose of the monitoring is to ascertain that the recommended mitigation measures are effective in reducing the noise levels. Details of the programme are provided in the stand-alone EM&A manual.

4.10 Conclusion

4.10.1 Construction Phase

4.10.1.1 The assessment for the potential construction noise impact of the Project has been conducted. The assessment results indicate that the mitigated noise levels at all NSRs would comply with the noise criteria set out in the EIAO-TM with the implementation of the proposed noise mitigation measures, including good site practices, use of QPME, deployment of construction noise barriers and enclosure, and provision of minimum separation between the affected school and the critical construction activity during examination period. Thus, no adverse construction noise impact arising from the Project would be anticipated. A construction noise management plan, aiming to verify the inventory of noise sources, and to assess the effectiveness and practicality of all identified measures for mitigating the construction noise impact of the project, would be prepared to submit during pre-tender stage, if any, and before the commencement of the project to demonstrate that the quiet construction methods and equipment can be duly specified and implemented for the corresponding noisy construction activities. Regular site environmental audit during construction phase is recommended to ensure proper implementation of mitigation measures and good site practices.

4.10.2 Operation Phase

4.10.2.1 The assessment for the potential road traffic noise impact from operation of the Project has been conducted. The assessment results indicate that the predicted road traffic noise levels at some of the representative NSRs would exceed the noise criteria under the unmitigated scenario.

4.10.2.2 Although some of the NSRs are still predicted to exceed the noise criteria under the mitigated scenario, with the implementation of noise mitigation measures including LNRS, vertical noise barriers/cantilevered noise barriers, semi-enclosure and full enclosure on certain Project roads, the exceedances were dominantly contributed by other existing roads. The contributions from the Project roads to the overall noise levels at all NSRs are predicted to be less than 1.0 dB(A) and all the predicted noise levels of the Project roads would comply with the noise criteria. As such, adverse road traffic noise impact arising from the Project is not anticipated.