4              Noise

4.1         INTRODUCTION

4.1.1        This section evaluates the 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 under Clause 3.4.5 and Appendix C of the EIA Study Brief (No. ESB-339/2021) (hereinafter “the Study Brief”).

4.2         LEGISLATIONS, STANDARDS AND GUIDELINES

Construction Phase

4.2.1        The principal legislation relating to the control of construction noise due to the Project is the EIAO.  The EIAO-TM, issued under the EIAO, provides guidelines and noise criteria for evaluating noise impacts.  The assessment criteria are defined in Annex 5 of the EIAO-TM with reference made to Annex 13 of the EIAO-TM for the guidelines of noise assessment.

4.2.2        The Noise Control Ordinance (NCO) also provides statutory controls on general construction works during restricted hours (i.e. between 1900 and 0700 hours or at any time on a general holiday (including Sunday)).  A number of Technical Memoranda have been issued under the NCO to stipulate control approaches and criteria with respect to construction activities:

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

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

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

4.2.3        The GW-TM, which provides the guidelines for controlling the construction noise from the use of Powered Mechanical Equipment (PME)  at the construction work sites, details the procedures that should be adopted for the assessment of noise from construction work other than percussive piling during restricted hours and for the issuing of Construction Noise Permits (CNP) by the Noise Control Authority. 

4.2.4        In addition to the general controls on the use of PME during restricted hours, the use of Specified Powered Mechanical Equipment (SPME) and/or undertaking of Prescribed Construction Work (PCW) within designated areas are controlled under DA-TM.  The DA-TM details the procedures for the assessment of the use of SPME and/or undertaking of PCW during restricted hours for issuing of CNP adopted by the Noise Control Authority.

(a)    General Construction Works during Non-Restricted Hours

4.2.5        Under the EIAO, potential noise impact arising from general construction works during non-restricted hours (i.e. 0700 to 1900 hours on any day not being a Sunday or general holiday) at noise sensitive uses that rely on opened windows for ventilation, should be assessed in accordance with the noise criteria specified in the EIAO-TM.  The EIAO-TM noise standards are presented in Table 4.1.

 

Table 4.1 - EIAO-TM Daytime Construction Noise Standards (Leq(30min) dB(A))

Uses

Noise Standards

Domestic premises, hotel, hostel

75

Educational Institutions

70

Educational Institution (during examination periods)

65

Notes:

(a)    The above standards apply to uses which rely on opened windows for ventilation.

(b)    The above standards shall be viewed as the maximum permissible noise levels assessed at 1m from the external façade.

(b)   General Construction Works during Restricted Hours

4.2.6        When assessing a CNP application for the use of PME during the restricted hours (i.e. 1900 to 0700 hours of the next day or any time on Sundays or general holidays), the Noise Control Authority will compare the Acceptable Noise Levels (ANLs), as promulgated in GW-TM, and the Corrected Noise Levels (CNLs) (i.e. after accounting for factors such as barrier effects and reflections) associated with the proposed PME operations.  The ANLs are obtained with corrections for the duration of the CNP and multiple permit situations, if appliable to the Basic Noise Levels (BNLs). The BNLs are related to the noise sensitivity of the area in question and different Area Sensitivity Ratings (ASRs) have been established to reflect the background characteristics of different areas.  The appropriate ASR for the Noise Sensitive Receiver (NSR) is determined with reference to Table 4.2.  The relevant BNLs are shown in Table 4.3.

Table 4.2 - Area Sensitivity Ratings (ASRs)

Types of Area Containing NSR

Degree to which NSR is affected by Influencing Factor (IF)

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:

The following definitions apply:

(a)      "Country Park" means an area that is designated as a country park pursuant to section 14 of the Country Parks Ordinance;

(b)      "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;

(c)      "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;

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

(e)      "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.

 

Table 4.3 – Basic Noise Levels of General Construction Works

Time Period

LAeq, 5min (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

4.2.7        The Noise Control Authority will consider a well-justified CNP application, for the construction works within restricted hours as guided by the relevant TMs issued under the NCO.  The Noise Control Authority will take into account the adjoining land uses, contemporary conditions/situation, and any complaints against construction activities at the site before making a decision.  Nothing in this EIA Report shall bind the Noise Control Authority in making its decision.  The Noise Control Authority may include any conditions in a CNP that it considers appropriate.  Failure to comply with any such conditions may lead to cancellation of the CNP and prosecution action under the NCO.

4.2.8        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 materials and hammering.

4.2.9        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 ANLs and criteria stipulated in the GW-TM and DA-TM can be met.

4.2.10     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.  Referring to the construction method for the Project, percussive piling is not required.

Operation Phase

4.2.11     Road traffic noise is controlled under EIAO-TM, with relevant noise standards and guidelines stipulated in Annexes 5 and 13. 

4.2.12     The road traffic noise is presented in terms of noise levels exceeded for 10% of the one-hour period for the hour having the peak traffic flow [L10(1 hour) dB(A)].  The noise standards of Road Traffic Noise for planning purpose as stipulated in Annex 5 of EIAO-TM are presented in Table 4.4. 

Table 4.4 - Noise standards for Road Traffic Noise

Common Uses

Road Traffic Noise

Peak Hour Traffic L10 1 hour (dB(A))

All domestic premises including temporary housing accommodation

70

Hotel and hostels

70

Offices

70

Educational institutions including kindergartens, nurseries and all others where unaided voice communication is required

65

Places of public Worship and courts of law       

65

Hospitals, clinics, convalescences and homes for the aged, diagnostic rooms, wards

55

Notes:

(a)     The above standards apply to uses which rely on opened windows for ventilation

(b)     The above standards should be viewed as the maximum permissible noise levels assessed at 1m from the external facade

 

 

4.3         DESCRIPTION OF ENVIRONMENT

4.3.1        The site location is within an urban area which is mainly bounded by high-rise residential buildings, low rise village houses and educational institutions. The noise source at the Project site is dominated by existing roads.

4.4         ASSESSMENT AREA AND NOISE SENSITIVE RECEIVERS

4.4.1        The assessment area for noise impact assessment is defined by a distance of 300m from the boundary of the Project site and the works of the Project, in accordance with Appendix C of the EIA Study Brief.  Existing, committed and planned NSRs earmarked on the relevant Outline Zoning Plans (OZP), Development Permission Area Plans, Outline Development Plans, Layout Plans and other relevant published land use plans, including plans and drawings published by the Lands Department and any land use and development applications approved by the Town Planning Board, in the vicinity of the Study have been identified.

4.4.2        The first layer of the NSRs have been selected as representative NSRs and included in the noise impact assessments as the NSRs behind are located further away from the Project and/or are screened by existing structures. Representative NSRs for construction noise assessment are selected with direct views to the construction works sites, while that for road noise assessment are selected with direct views to the new road segments.

4.4.3        All existing and planned NSRs identified are listed in Table 4.5 and shown in Figure 4.1.The identified representative NSRs and the selected Noise Assessment Points (NAP) are listed in Table 4.6 and Appendix 4.1.2 with their locations shown in Figures 4.1.1 to 4.1.4. Map showing the locations and details of the NAPs is provided in Appendix 4.17.

4.4.4        With reference to the latest Tuen Mun OZP No. S/TM/36, some areas zoned as GIC are identified as NSR within the assessment area. During the course of the EIA study, there were no available information on planned usage and building layout plans of some of the potential GIC developments (PN4 to PN9). Therefore, some assessment points have been conservatively selected at the boundary of potential GIC development area or referring to the recommended buffer distances between the road type and the land uses according to the HKPSG for the operation phase traffic noise impact assessment. In the absence of information on the potential future development at these area, assessment has been conducted based on the proposed storey nos as per the OZP if available. PN4 adjoins Tuen Mun Road which is an Urban Trunk Road, the minimum buffer distance should not be less than 20m for active and passive recreation uses as per Table 3.1 of the HKPSG. PN5 faces Lung Mun Road which is a District Distributor, the minimum buffer distance should not be less than 10m for active and passive recreation uses. Since there is LRT track between Lung Mun Road and the PN5 site, and the site is located on top level of an existing retaining wall, the assessment points for PN5 are assumed to be at the edge of the retaining wall.  PN6/PN9 and PN7 faces Tsing Wun Road and Hoi Wing Road respectively. Both roads are District Distributor, the minimum buffer distance is also 10m for active and passive recreation uses. The assessment points for PN8 faces Yip Wong Road are assumed to be on top of the existing slope.

Table 4.5 - Identified Noise Sensitive Receivers (NSRs)

NSR ID

Description

Existing NSRs

H1

Sam Shing Hui

H2

Palm Cove

H3

Dragon Inn Court

H4

Tsing Yung Terrace

H5

Kam Fai Garden

H6

Harvest Garden

H7

TWGHs Tai Tung Pui Social Services Building

H8

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

H9

Semple Memorial Secondary School

H10

Hanford Garden

H11

Sam Shing Estate

H12

Siu Lun Court

H13

Pok Oi Hospital Tuen Mun Nursing Home

H16

Lui Cheung Kwong Lutheran Primary School

H22

Hong King Garden

H24

JC Place

H25

Rainbow Garden

H26

Po Leung Kuk Hong Kong Taoist Association Yuen Yuen Primary School

H34

Alpine Garden

H35

Hoi Tak Garden

H37

Castle Peak Bay Garden

H38

Tuen Mun Cornwall Elderly's Home

H39

Verdant Villa

H40

Pine Villas

H41

Faraday House

H42

Scenic Villa

H43

Sam Chau Ma Temple

H44

Dragon Villa

H45

South Crest

H46

Crown by the Sea

H49

Seaview Garden

H50

Elegant Villa

H51

Tuen Mun Court

H52

Bayview Terrace

H53

Caritas Li Ka Shing Care and Attention Home

H54

Village House near Dragon Inn Court and Scenic Villa

H57

Village House between Palm Cove and Dragon Inn

H58

Tsui Ning Garden

H59

Boulder Lodge Staff Quarter

H60

Tuen Mun Siu Lun Government Complex

L27

Tsing Shan Tsuen

L28

Yuan Ming Monastery

L29

Yan Chi Monastery

L30

Yan Chai Hospital No.2 Secondary School

L31

Ju Ching Chu Secondary School (Tuen Mun)

L32

Independent Commission Against Corruption (ICAC) Training Camp

L33

Hong Chi Morninghill School / Hong Chi Morninglight School

L34

Tin Tak Shing Kau to Tong - Tuen Mun

L35

Glorious Garden

L36

Lung Mun Oasis

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L38

Lung Yat Estate

L39

Hong Kong Christian Service Jockey Club Lodge of Rising Sun

L40

SKH St. Peter's Church (Castle Peak)

L41

Hong Kong Institute of Vocational Education (Tuen Mun)

L42

SKH St. Peter's Church Kindergarten & Child Care Centre

L44

Hung To Garden

L45

Kok Chan Sim Chi

L46

Richie House

L47

Felicity Garden

L48

Ling Yim Buddhism Institute

L49

Wai Lin Ching She

L75

The Esplanade

L76

Sze Lo Temple

L77

Village House opposite to Felicity Garden (L47_1)

L78

Cannan Garden

L79

Miu Chong Temple

L80

Yuen Yung Ching She

L81

Tin Hau Temple at Tin Hau Road

L87

Tuen Mun Children and Juvenile Home

L88

Village houses near Yip Wong Road

L94

Sun Tuen Mun Centre

Planned NSRs

PN1

Public Housing Development at Yip Wong Road

PN3

Planned Residential Development at Ex-salvation Army Sam Shing Chuen Lau Ng Ying School / The Salvation Army ‘To Gather’ @ Sam Shing Transitional Housing

PN4

Proposed G/IC Facilities near Siu Lun Complex

PN5

Proposed G/IC Facilities near Tuen Mun Children and Juvenile Home

PN6

Proposed G/IC Facilities at Former St. Simon’s Primary School

PN7

Proposed G/IC Facilities at Car Park near Sam Shing Hui

PN8

Proposed G/IC Facilities at Tuen Mun Kau Hui

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN10

Proposed Residential Development at 8 Tsing Ha Lane

PN11

Proposed G/IC Facilities at Hong Kong Girl Guide Tuen Mun Campsite

Table 4.6 - Representative Noise Assessment Points (NAPs)

NSR ID

NAP ID

Description

Type of Use (a)

Existing NSRs

H1

H1_1

Sam Shing Temple Office

Office

H1_2

Sam Shing Temple

Place of Worship

H1_3

Sam Shing Hui Office

Office

H1_4

Fuk Tak Shrine

Place of Worship

H2

H2_1

Palm Cove (Tower 6)

Residential

H2_2

Palm Cove (Tower 5)

Residential

H3

H3_1

Dragon Inn Court (Block 4)

Residential

H3_2

Dragon Inn Court (Block 3)

Residential

H4

H4_1

Tsing Yung Terrace Block 1

Residential

H5

H5_1

Kam Fai Garden (Block 3)

Residential

H5_2

Kam Fai Garden (Block 3)

Residential

H5_3

Kam Fai Garden (Block 2)

Residential

H5_4

Kam Fai Garden (Block 2)

Residential

H5_5

Kam Fai Garden (Block 1)

Residential

H5_6

Kam Fai Garden (Block 1)

Residential

H5_7

Kam Fai Garden (Block 3)

Residential

H5_8

Kam Fai Garden (Block 3)

Residential

H5_9

Kam Fai Garden (Block 2)

Residential

H5_10

Kam Fai Garden (Block 2)

Residential

H5_11

Kam Fai Garden (Block 1)

Residential

H5_12

Kam Fai Garden (Block 1)

Residential

H6

H6_1

Harvest Garden (Block 1)

Residential

H6_2

Harvest Garden (Block 1)

Residential

H7

H7_1

Day Care Centre (G/F)Care & Attention Home (1/F-4/F)

Activity Centre (5/F-8/F)

Physiotherapy Room (9/F)

G/F to 8/F: Homes for the Aged (Residential)

9/F: Clinic

H7_2

Day Care Centre (G/F)

Care & Attention Home (1/F-4/F)

Activity Centre (5/F-8/F)

Physiotherapy Room (9/F)

G/F to 8/F: Homes for the Aged (Residential)

9/F: Clinic

H7_3

Day Care Centre (G/F)

Care & Attention Home (1/F-4/F)

Activity Centre (5/F-8/F)

Physiotherapy Room (9/F)

G/F to 8/F: Homes for the Aged (Residential)

9/F: Clinic

H7_4

Day Care Centre (G/F)

Care & Attention Home (1/F-4/F)

Activity Centre (5/F-8/F)

Physiotherapy Room (9/F)

G/F to 8/F: Homes for the Aged (Residential)

9/F: Clinic

H8

H8_1

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational Institution

H8_2

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational Institution

H9

H9_1

Semple Memorial Secondary School

Educational Institution

H9_2

Four Gospel Church

Place of Worship

H10

H10_1

Hanford Garden (Block 2)

Residential

H10_2

Hanford Garden (Block 2)

Residential

H10_3

Hanford Garden (Block 1)

Residential

H10_4

Hanford Garden (Block 1)

Residential

H10_5

Hanford Garden (Block 1)

Residential

H10_6

Hanford Garden (Block 3)

Residential

H10_7

Hanford Garden (Block 4)

Residential

H11

H11_1

Sam Shing Estate (Chun Yu House)

Residential

H11_2

The Salvation Army Sam Shing Nursery School

Educational

H12

H12_1

Siu Lun Court (Sui Lun House)

Residential

H12_2

Siu Lun Court (Sui Lun House)

Residential

H12_3

Siu Lun Court (Sui Lun House)

Residential

H12_4

Siu Lun Court (Ka Lun House)

Residential

H12_5

Siu Lun Court (Fu Lun House)

Residential

H12_6

Siu Lun Court (Fu Lun House)

Residential

H22

H22_1

Hong King Garden (Block B)

Residential

H22_2

Hong King Garden (Block B)

Residential

H24

H24_1

JC Place (Tower 1)

Residential

H24_2

JC Place (Tower 1)

Residential

H53

H53_1

Caritas Li Ka Shing Care and Attention Home (1/F)

Clinics

H54

H54_1

Village House near Dragon Inn Court and Scenic Villa

Residential

L27

L27_1

Tsing Shan Tsuen No. 83

Residential

L27_2

Tsing Shan Tsuen No. 82

Residential

L27_3

Tsing Shan Tsuen No. 98

Residential

L27_4

Tsing Shan Tsuen No. 113

Residential

L27_5

Tsing Shan Tsuen No. 114

Residential

L27_6

Tsing Shan Tsuen No. 111A

Residential

L28

L28_1

Yuan Ming Monastery

Place of Worship

L30

L30_1

Yan Chai Hospital No.2 Secondary School

Educational Institution

L30_2

Yan Chai Hospital No. 2 Secondary School

Educational Institution

L31

L31_3

Ju Ching Chu Secondary School (Tuen Mun)

Educational Institution

L31_4

Ju Ching Chu Secondary School (Tuen Mun)

Educational Institution

L31_5

Ju Ching Chu Secondary School (Tuen Mun)

Educational Institution

L32

L32_1

ICAC Training Camp

Educational Institution

L32_2

ICAC Training Camp

Educational Institution

L32_3

ICAC Training Camp

Educational Institution

L32_4

ICAC Training Camp

Educational Institution

L32_5

ICAC Training Camp

Educational Institution

L32_6

ICAC Training Camp

Educational Institution

L32_7

ICAC Training Camp

Educational Institution

L32_8

ICAC Training Camp

Educational Institution

L32_9

ICAC Training Camp

Educational Institution

L33

L33_1

Hong Chi Morninghill School / Hong Chi Morninglight School

Educational Institution

L33_2

Hong Chi Morninghill School / Hong Chi Morninglight School

Educational Institution

L33_3

Hong Chi Morninghill School / Hong Chi Morninglight School

Educational Institution

L34

L34_1

Tin Tak Shing Kau to Tong - Tuen Mun

Place of Worship

L35

L35_1

Glorious Garden Block 2

Residential

L36

L36_2

Lung Mun Oasis Block 2

Residential

L36_3

Lung Mun Oasis Block 2

Residential

L36_4

Lung Mun Oasis Block 3

Residential

L36_5

Lung Mun Oasis Block 3

Residential

L36_6

Lung Mun Oasis Block 4

Residential

L36_7

Lung Mun Oasis Block 4

Residential

L36_8

Lung Mun Oasis Block 5

Residential

L36_10

W.F.B. Avalokitesvara Nursery School

Educational Institution

L37

L37_1

The Church of Christ in China Hoh Fuk Tong Primary School

Educational Institution

L37_2

The Church of Christ in China Hoh Fuk Tong Primary School

Educational Institution

L37_3

The Church of Christ in China Hoh Fuk Tong Primary School

Educational Institution

L38

L38_1

Lung Yat Estate Kin Lung House

Residential

L38_2

Lung Yat Estate Kin Lung House

Residential

L38_3

Lung Yat Estate Hong Lung House

Residential

L39

L39_1

Hong Kong Christian Service Jockey Club Lodge of Rising Sun

 Residential

L40

L40_1

SKH St. Peter's Church (Castle Peak)

Place of Worship

L40_2

SKH St. Peter's Church (Castle Peak)

Place of Worship

L42

L42_1

S.K.H. St. Peter's Church Castle Peak Kindergarten & Child Care Centre

Educational Institution

L42_2

S.K.H. St. Peter's Church Castle Peak Kindergarten & Child Care Centre

Educational Institution

L49

L49_1

Wai Lin Ching She

Place of Worship

L78

L78_1

Cannan Garden

Residential

L88

L88_1

Village houses near Yip Wong Road

Residential

Planned NSRs

PN1

PN1_1

Public Housing Development at Yip Wong Road (Block 4)

Residential

PN1_2

Public Housing Development at Yip Wong Road (Block 4)

Residential

PN1_3

Public Housing Development at Yip Wong Road (Block 3)

Residential

PN1_4

Public Housing Development at Yip Wong Road (Block 4 - Kindergarten at 1/F Lower Floor)

Educational Institution

PN3

PN3_1

Transitional Housing Development at Ex-Salvation Army Sam Shing Chuen Lau Ng Ying School

Residential

PN4

PN4_1

Proposed G/IC Facilities near Siu Lun Complex

G/IC

PN4_2

Proposed G/IC Facilities near Siu Lun Complex

G/IC

PN5

PN5_1

Proposed G/IC Facilities near Tuen Mun Children and Juvenile Home

G/IC

PN5_2

Proposed G/IC Facilities near Tuen Mun Children and Juvenile Home

G/IC

PN5_3

Proposed G/IC Facilities near Tuen Mun Children and Juvenile Home

G/IC

PN6

PN6_1

Proposed G/IC Facilities at Former St. Simon’s Primary School

G/IC

PN7

PN7_1

Proposed G/IC Facilities at Car Park near Sam Shing Hui

G/IC

PN7_2

Proposed G/IC Facilities at Car Park near Sam Shing Hui

G/IC

PN8

PN8_1

Proposed G/IC Facilities at Tuen Mun Kau Hui

G/IC

PN8_2

Proposed G/IC Facilities at Tuen Mun Kau Hui

G/IC

PN8_3

Proposed G/IC Facilities at Tuen Mun Kau Hui

G/IC

PN8_4

Proposed G/IC Facilities at Tuen Mun Kau Hui

G/IC

PN9

PN9_1

Proposed G/IC Facilities at Tsing Shan Tsuen

G/IC

PN9_2

Proposed G/IC Facilities at Tsing Shan Tsuen

G/IC

PN9_3

Proposed G/IC Facilities at Tsing Shan Tsuen

G/IC

PN9_4

Proposed G/IC Facilities at Tsing Shan Tsuen

G/IC

PN9_5

Proposed G/IC Facilities at Tsing Shan Tsuen

G/IC

Note:

(a)     G/IC - Government, Institution or Community. 

 

4.5         IDENTIFICATION OF ENVIRONMENTAL IMPACTS

Construction Phase

4.5.1        Potential source of noise impact during construction phase of the Project would be due to the use of PME from different construction activities. The construction of the Project will be commenced from 2024 to 2031 tentatively. Tentative construction programme of the Project is presented in Appendix 4.2.1. Based on the current construction plan, no construction works are planned during restricted hours. Details of the proposed construction methods are described in Chapter 2 of this EIA Report, with major construction activities listed in Table 4.7.

Table 4.7 - Construction Activities

Location

Activity

All Works Areas

(i)               Tree Felling & Site Clearance

Lung Fu Road Slip Road

LFR Viaduct (North Section) (including road improvement (realignment) works at Lung Mun Road and Slip Road of WCR to TWR)

(i)               Predrilling

(ii)              UU (Underground Utility) Diversion

(iii)             Piling (reverse circulation drill)

(iv)             Excavation and Lateral Support (ELS) System including slope works (sheet piling)

(v)              Pile Caps

(vi)             Abutment & Piers, and Reinstatement of Slope

(vii)           Bridge Deck

(viii)          Noise Barriers (including erection/removal of existing noise barriers), Street Furniture, Road Surfacing & Road Marking

(ix)             Landscape and Establishment Works

LFR Viaduct (South Section) (including road improvement works at Lung Chak Road and Slip Road of WCR to TWR)

(i)                Predrilling

(ii)              UU (Underground Utility) Diversion

(iii)             Piling (reverse circulation drill)

(iv)             Excavation and Lateral Support (ELS) System including slope works (sheet piling)

(v)              Pile Caps

(vi)             Abutment & Piers, and Reinstatement of Slope

(vii)           Bridge Deck

(viii)          Noise Barriers (including erection/removal of existing noise barriers), Street Furniture, Road Surfacing & Road Marking

(ix)             Landscape and Establishment Works

Slip Road between TWR & WCR

(i)               Predrilling

(ii)              ELS

(iii)             Piling (Stage 1 - At Ex. Slopes)

(iv)             Retaining Walls and U-troughs (Stage 1)

(v)              Formation of Temp. Road for Traffic Diversion

(vi)             Piling (Stage 2 - At Ex. Slip Road)

(vii)           Retaining Walls and U-troughs (Stage 2)

(viii)          Street Lighting, Street Furniture, Road Surfacing & Road Marking

(ix)             Landscape and Establishment Works

TWR adjacent to Tsing Shan Tsuen LRT Station

(i)               Street Lighting, Street Furniture, Road Surfacing & Road Marking

(ii)              Landscape and Establishment Works

Road Intersection of Lung Mun Road near Glorious Garden

(i)               Street Lighting, Street Furniture, Road Surfacing & Road Marking

(ii)              Landscape and Establishment Works

Hoi Wing Road Slip Road

(i)               Predrilling

(ii)              UU Diversion, Removal and Reprovision of Staircase

(iii)             ELS Works including slope works (sheet piling) (Stage 1 - For Piling Works)

(iv)             Piling (Bored Piles)

(v)              Piling (Socketed H-piles)

(vi)             ELS Works (Stage 2 - For U-trough Construction)

(vii)           U-trough Structure

(viii)          Street Lighting, Street Furniture, Road Surfacing & Road Marking

(ix)             Landscape and Establishment Works

Junction Improvement of Castle Peak Road

(i)               UU Diversion

(ii)              Junction Improvement Works

Junction Improvement Works between Sam Shing Street and Castle Peak Road

(i)             Junction Improvement Works

Note: 

No percussive piling is anticipated for the Project. Notwithstanding, should percussive piling be required, the requirement in PP-TM shall be followed.

4.5.2        During the construction, some existing noise barriers on the existing roads will be required to be temporary removed. These noise barriers will be re-provided. The indicative locations of the re-provision or temporary removal of the noise barriers are shown in Appendix 4.5.2.

4.5.3        As shown in Appendix 4.5.2, two portions of existing noise barriers at Lung Fu Road will be removed after the construction of the proposed LFRSR NB and SB, including the erection of reprovisioned noise barriers at the proposed LFRSR. Based on this, adverse traffic noise impact during construction phase is not anticipated. The extent and height of the reprovisioned noise barriers have been proposed and shown in Figure 4.3. The barriers will follow the design of the “Guidelines on Designing Noise Barrier” and its preliminary design is shown in Appendix 4.12. The lower portions of the barriers will be provided with absorptive panels, which are the same as the existing ones. The proposed reprovisioning works at Lung Fu Road has been taken into account in the traffic noise impact assessment. Results indicated that the proposed reprovisioning works at Lung Fu Road will not cause adverse noise impact at the nearby NSRs with the implementation of proposed noise mitigation measures (see Section 4.8).

4.5.4        Based on the construction activities presented in Table 4.7, piling works would be carried out. No percussive piling works will be anticipated for the Project. Alternative piling method has been considered and adopted in lieu of percussive piling method.

4.5.5        The extent and significance of construction noise impact will depend on the types and numbers of PME in operation. Construction works will be carried out during non-restricted hours as far as practicable. Noise impact of construction works outside restricted hours will be identified and evaluated in this EIA study.  In case construction work is required to carry out during restricted hours, a Construction Noise Permit (CNP) is required.  The Contractor will be required to submit CNP application(s) to the Noise Control Authority and abide by any conditions stated in the CNP, should one be issued.  It is the Contractor’s responsibility to ensure compliance with the NCO and the relevant TMs.  The conditions stipulated in the CNP and the mitigation measures should be implemented for the construction works conducted during the restricted hours.

4.5.6        The construction of the Project is anticipated to commence in 2024 Q3 and for completion by 2031 Q4. As mentioned in Chapter 1, potential concurrent projects have been identified in the vicinity of the Study Area during construction phase of the Project (refer to Figure 1.2):

·        Site Formation and Infrastructure Works for Public Housing Developments at Tuen Mun Central – Phase 1

·        Cycle track between Tsuen Wan and Tuen Mun (Tuen Mun to So Kwun Wat Section)

·        Tuen Mun South Extension

·        Tuen Mun Bypass

·        Reprovision of Tuen Mun Swimming Pool, Tuen Mun Golf Centre Practice Green and Community Green Station

4.5.7        Construction of Public Housing Development (PHD) at Yip Wong Road is the potential concurrent project under Site Formation and Infrastructure Works for Public Housing Developments at Tuen Mun Central – Phase 1. Based on the information in Final Preliminary Environmental Review Report for Site Formation and Infrastructure Works for Public Housing Developments at Tuen Mun Central – Investigation, Design and Construction, it is expected that the construction of Public Housing Development at Yip Wong Road would be completed in December 2024. Considering the construction of the Project will be commenced in 2024 Q3, (refer to the construction programme presented in Appendix 4.2.1), the construction of Public Housing Development at Yip Wong Road would pose cumulative construction noise impact to the NSRs in the vicinity of the works sites of the Project. The predicted cumulative construction noise levels are summarised in Table 4.11 and the detailed calculation of cumulative construction noise impact are shown in Appendix 4.11.2. 

4.5.8        Based on the latest available information, the tentative construction work for the entire cycle tracks will commence in 2023 for completion by 2026. It is anticipated that the cycle tracks would pose cumulative construction noise impact to the NSRs in the vicinity of the works sites of the Project.  The predicted cumulative construction noise levels are summarised in Table 4.11 below and the detailed calculation of cumulative construction noise impact are shown in Appendix 4.11.2.

4.5.9        The construction of Tuen Mun South Extension will be under progress tentatively from 2023 to 2030. Based on the EIA report for Tuen Mun South Extension (AEIAR-236/2022), part of the Tuen Mun South Extension project would be located within 300 m assessment area of the work site for the proposed Lung Fu Road Slip Road.  Most of residential buildings and school facing the proposed Lung Fu Road Slip Road would not have direct line of sight to the work sites of the Tuen Mun South Extension project.  Considering that the project proponent of Tuen Mun South Extension would implement sufficient noise mitigation measures, such as quiet plant and noise barriers, to ensure the compliance of the construction noise criteria at the nearby NSRs, no significant cumulative construction noise impact will be anticipated. Nonetheless, cumulative noise impact will be expected at those NSRs, i.e.,L38 and PN1 are located closest to the Tuen Mun South Extension.The cumulative construction noise levels for these NSRs have been assessed and are summarized in Table 4.11 below and the detailed calculation of cumulative construction noise impact are shown in Appendix 4.11.2.      

4.5.10     According to the latest available information, the construction works of Tuen Mun Bypass are tentatively scheduled to be completed by 2036 or earlier by 2033 Q4. Solid information on the construction programme of the Tuen Mun Bypass Project was not available at this stage. In view that the construction activities of the Tuen Mun Bypass project that overlapping with the Project is the construction of tunnel. Therefore, airborne noise during construction phase of Tuen Mun Bypass in the vicinity of Hoi Wing Road is not anticipated.

4.5.11     According to the latest available information, the reprovision of Community Green Station are tentatively scheduled to be completed by 2024. However, solid information on the construction programme and plant inventory is not available at the time of this EIA study The re-provisioning site is located under Lung Fu Road flyover.  Considering sufficient noise mitigation measures, such as quiet plant and noise barriers, will be implemented by the project proponent of the re-provisioning of Tuen Mun Community Green Station for achievement of noise compliance, no significant cumulative construction noise impact is anticipated.

4.5.12     According to the latest available information, the reprovision of Tuen Mun Swimming Pool and Tuen Mun Golf Centre Practice Green are tentatively scheduled to be completed by 2026. However, solid information on the construction programme and plant inventory is not available at the time of this EIA study. The re-provisioning site is located under Lung Fu Road flyover and in a considerable separation distance between the Project and this concurrent project.  Considering sufficient noise mitigation measures, such as quiet plant and noise barriers, will be implemented by the project proponent of the re-provisioning of Tuen Mun Swimming Pool and Tuen Mun Golf Centre Practice Green for achievement of noise compliance, no significant cumulative construction noise impact is anticipated.

4.5.13     For the abovementioned concurrent projects that may pose cumulative noise impact but the construction programme and/or the plant inventory are not yet available for assessment at this stage, further review(s) on the cumulative construction noise impact shall be carried out in the later Construction Noise Management Plan (CNMP) stage when the relevant information is available.

Operation Phase Road Traffic Noise

4.5.14     No fixed plant noise sources are proposed for the Project.

4.5.15     The operation phase noise impacts arising from the Project mainly come from road traffic noise as vehicular movement on the proposed Project roads. “Project roads” refers to the roads that are newly developed or substantially changed due to the Project.  The cumulative noise impact of neighbouring roads such as the Tuen Mun Road, Wong Chu Road, Hoi Wing Road, Tsing Wun Road, Lung Mun Road and Lung Fu Road upon the surrounding NSRs have also been considered. All road sections other than the “Project roads” as defined above are regarded as “Existing roads” in this assessment. The road sections of the “Existing roads” and the “Project roads” have been identified and presented in Figure 4.2. In this assessment, LFRSR SB, LFRSR NB and HWRSR are identified as “Project roads”. Other junction and road modification works and road improvement works are regarded as “Existing roads”.

4.6         ASSESSMENT METHODOLOGY

Construction Noise

4.6.1        The construction noise impact assessment was undertaken in accordance with the procedures outlined in the GW-TM, which is issued under the NCO.  The assessment methodology is summarised as follows:

·        Locate representative NSRs that may be affected by the Project;

·        Determine the PME used for corresponding activities, based on the agreed plant inventory provided by Project Engineer;

·        Assign sound power levels (SWLs) to the PME proposed based on the GW-TM and other recognized sources ([1])([2]);

·        Calculate the correction factors based on the distance between the NSRs and the notional noise source position of the work sites;

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

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

4.6.2        The construction programme and zoning arrangement of construction activities are presented in Appendix 4.2.1 and Appendix 4.2.2.  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.

4.6.3        Where predicted noise level exceeds the noise criteria, appropriate noise mitigation measures, including quieter construction methods, quality PME and use of insulation fabric/noise barriers/enclosures, will be proposed and investigated. The mitigated scenario at different construction phases of the Project will be assessed, if applicable.  The residual construction noise impact will be evaluated if the mitigated noise levels still exceed the relevant noise criteria upon exhaust of direct mitigation measures.

4.6.4        The potential concurrent projects in the vicinity of the Project have been identified. Cumulative construction noise impacts from the potential concurrent projects are assessed based on the latest public available information and information from the relevant authorities.

Operation Phase Road Traffic Noise

4.6.5        Road traffic noise prediction is carried out, following strictly 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 have been included in the assessment.

4.6.6        Traffic noise is predicted based on the maximum traffic flow within 15 years upon commencement of operation of the Project according to Appendix C of the EIA Study Brief and Section 5.1 in Annex 13 of the EIAO-TM.

4.6.7        All major road segments within 300m from the boundary of the Project site area and all relevant structures and features that could have noise screening or reflective effects have been taken into consideration in the road traffic noise impact assessment.  The characteristics of the road segments including the road width, surface type and traffic flow have been considered in the assessment.  The surface type of the concerned road segments has been confirmed with HyD. 

4.6.8        As confirmed by the Traffic Consultant, Year 2036 has the maximum traffic projection within 15 years (from Year 2031 to 2046) upon commencement of operation of the Project. While it is anticipated that the traffic loading of some roads in Tuen Mun area will be relieved due to the commencement of the planned Tuen Mun Bypass (TMBP) in Year 2033 under the latest policy initiatives, the other possible critical traffic condition would occur in Year 2036 with the proposed new road links and without TMBP following the original time-table of TMBP. Review of the traffic forecast in Years 2033 and 2036 both without TMBP indicates that the % of increase from Year 2033 to 2036 is very minimal and the difference in noise levels between these 2 years is expected to be less than 0.1 dB(A) in general.  Therefore, the scenario of Year 2036 with the proposed new road links and without TMBP was adopted as the maximum traffic forecast scenario within 15 years for assessment.

4.6.9        The traffic flow adopted for noise assessment has been endorsed by the related authority, i.e. Transport Department.  The peak hour traffic flow of “With Project” and “Without Project” scenarios in Year 2036 is given in Appendix 4.4.1, the endorsement from Transport Department is given in Appendix 4.4.2, written correspondence from the Traffic Consultant confirming the methodology of the traffic forecast endorsed by TD has been strictly adopted in preparing the traffic data for the road traffic noise assessment of this EIA, and the predicted peak hour traffic flow in Year 2036 is the maximum traffic projection within 15 years upon operation of the project is given in Appendix 4.4.3.

4.6.10     The following scenarios are considered for traffic noise impact assessment in accordance with EIA Study Brief and the EIAO Guidance Note No. 12/2012 (GN 12/2012):

·                  Unmitigated scenario in Year 2036 and without the operation of TMBP;

·                  Mitigated scenario in Year 2036 and without the operation of TMBP; and

·                  Prevailing scenario in Year 2023 for indirect mitigation measures eligibility assessment.

4.6.11     With consideration of the scope of this Project, road sections were 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 proposed project. In this Project, proposed widening and addition of slip roads at Lung Fu Road and Hoi Wing Road are identified as new roads. All road sections defined in the scope of designated project defined in EIAO are considered as “Project roads”. Spot Heights of the “Project roads” are illustrated in Appendix 4.16.

·        “Existing roads” which are unchanged or without significant traffic noise impact (i.e. the traffic noise level with the road project would not be greater than that without the road project at the design year by 1.0 dB(A). In this assessment, junction modification works at Castle Peak Road – Castle Peak Bay/ Hoi Wing Road, Castle Peak Road – Castle Peak Bay/ Sham Shing Street, and road improvement works at LFR/ Lung Chak Road, Lung Mun Road and Slip Roads between Wong Chu Road and Lung Mun Road/Tsing Wun Road are regarded as “Existing roads”. Spot heights of the realigned slip road between Wong Chu Road and Tsing Wun Road are also illustrated in Appendix 4.16.

4.6.12        The extent of “Project roads” and “Existing roads” has been defined and presented in Figure 4.2. Low noise road surfacing (LNRS) and existing noise mitigation measures within the Assessment Area has been considered in the assessment.  Locations of existing noise barriers and enclosures within the Assessment Area are shown in Appendix 4.5.1.  The extent of LNRS on existing roads within the Assessment Area has been confirmed with HyD and is shown in Appendix 4.6.

4.6.13        In accordance with the GN 12/2012, direct mitigation measures should be proposed for “Project roads” if adverse environmental impact is predicted.  If the NSRs are affected by noise from other existing roads, direct mitigation measures are required to reduce the noise from the “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 overall noise level, if the cumulative noise level (i.e. noise from the Project roads together with other existing roads) exceeds the noise standard.

4.6.14        Indirect mitigation measures should be considered upon exhaust of direct mitigation measures to abate the residual impact from noise sources under the EIAO-TM and the GN 12/2010.  The eligibility testing criteria for indirect mitigation measures are listed as follows:

·        The predicted overall noise level from the Project roads, together with other traffic noise in the vicinity must be above a specified noise level (e.g. 70 dB(A) for domestic premises and 65 dB(A) for educational institutions.  All are in L10 (1hour));

·        The predicted overall noise level is at least 1.0 dB(A) more than the prevailing traffic noise level, i.e. the total traffic noise level existing before the works to construct Project roads were commenced; and

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

4.7         PREDICTION AND EVALUATION OF ENVIRONMENTAL IMPACTS

Construction Noise

4.7.1        Potential construction noise impacts of the Project during normal daytime working hours have been assessed at the representative NSRs according to the construction programme and construction plant inventory presented in Appendix 4.2.1 and Appendix 4.3 respectively. The unmitigated noise assessment results are summarized in Table 4.8. Details of the unmitigated construction noise assessment are presented in Appendices 4.7.1 and 4.7.2.


Table 4.8 - Summary of Construction Noise Assessment Results - Unmitigated

NAP ID

NSR Description

Type of Use

Noise Criteria

Leq (30 min), dB(A)

Predicted Unmitigated Maximum Construction Noise Level

Leq (30 min), dB(A)

H1_1

Sham Shing Temple Office

Office

75

83

H1_2

Sam Shing Temple

Place of Worship

70

81

H1_3

Sam Shing Hui Office

Office

75

83

H1_4

Fuk Tak Shrine

Place of Worship

70

84

H2_1

Palm Cove (Tower 6)

Residential

75

74

H2_2

Palm Cove (Tower 5)

Residential

75

74

H3_1

Dragon Inn Court (Block 4)

Residential

75

75

H3_2

Dragon Inn Court (Block 3)

Residential

75

77

H4_1

Tsing Yung Terrace Block 1

Residential

75

80

H5_1

Kam Fai Garden (Block 3)

Residential

75

79

H5_2

Kam Fai Garden (Block 3)

Residential

75

78

H5_3

Kam Fai Garden (Block 2)

Residential

75

78

H5_4

Kam Fai Garden (Block 2)

Residential

75

78

H5_5

Kam Fai Garden (Block 1)

Residential

75

78

H5_6

Kam Fai Garden (Block 1)

Residential

75

79

H5_7

Kam Fai Garden (Block 3)

Residential

75

78

H5_8

Kam Fai Garden (Block 3)

Residential

75

78

H5_9

Kam Fai Garden (Block 2)

Residential

75

78

H5_10

Kam Fai Garden (Block 2)

Residential

75

78

H5_11

Kam Fai Garden (Block 1)

Residential

75

78

H5_12

Kam Fai Garden (Block 1)

Residential

75

78

H6_1

Harvest Garden (Block 1)

Residential

75

76

H6_2

Harvest Garden (Block 1)

Residential

75

76

H7_1

Day Care Centre (G/F)

Homes for the Aged (Residential)

75

72

H7_2

Care & Attention Home (1/F-4/F)

Homes for the Aged (Residential)

75

72

H7_3

Activity Centre (5/F-8/F)

Residential

75

72

H8_1

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational

70

81

H8_2

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational

70

81

H9_1

Semple Memorial Secondary School

Educational

70

79

H9_2

Four Gospel Church

Place of Worship

70

90

H10_1

Hanford Garden (Block 2)

Residential

75

91

H10_2

Hanford Garden (Block 2)

Residential

75

87

H10_3

Hanford Garden (Block 1)

Residential

75

81

H10_4

Hanford Garden (Block 1)

Residential

75

82

H10_5

Hanford Garden (Block 1)

Residential

75

83

H10_6

Hanford Garden (Block 3)

Residential

75

79

H10_7

Hanford Garden (Block 4)

Residential

75

78

H11_1

Sam Shing Estate

Residential

75

83

H11_2

The Salvation Army Sam Shing Nursery School

Educational

70

72

H12_1

Siu Lun Court (Sui Lun House)

Residential

75

83

H12_2

Siu Lun Court (Sui Lun House)

Residential

75

84

H12_3

Siu Lun Court (Sui Lun House)

Residential

75

80

H12_4

Siu Lun Court (Ka Lun House)

Residential

75

79

H12_5

Siu Lun Court (Fu Lun House)

Residential

75

77

H12_6

Siu Lun Court (Fu Lun House)

Residential

75

75

H24_1

JC Place (Tower 1)

Residential

75

72

H24_2

JC Place (Tower 1)

Residential

75

71

H54_1

Village House near Dragon Inn Court and Scenic Villa

Residential

75

76

L27_1

Tsing Shan Tsuen No. 83

Residential

75

82

L27_2

Tsing Shan Tsuen No. 82

Residential

75

83

L27_3

Tsing Shan Tsuen No. 98

Residential

75

83

L27_4

Tsing Shan Tsuen No. 113

Residential

75

83

L27_5

Tsing Shan Tsuen No. 114

Residential

75

84

L27_6

Tsing Shan Tsuen No. 111A

Residential

75

85

L30_1

Yan Chai Hospital No. 2 Secondary School

Educational

70

82

L30_2

Yan Chai Hospital No. 2 Secondary School

Educational

70

80

L31_3

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

80

L31_4

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

86

L31_5

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

83

L32_1

ICAC Training Camp

Educational

70

87

L32_2

ICAC Training Camp

Educational

70

87

L32_3

ICAC Training Camp

Educational

70

86

L32_4

ICAC Training Camp

Educational

70

86

L32_5

ICAC Training Camp

Educational

70

86

L32_6

ICAC Training Camp

Educational

70

85

L32_7

ICAC Training Camp

Educational

70

85

L32_8

ICAC Training Camp

Educational

70

85

L32_9

ICAC Training Camp

Educational

70

84

L33_1

Hong Chi Morninglight School

Educational

70

83

L33_2

Hong Chi Morninglight School

Educational

70

84

L33_3

Hong Chi Morninglight School

Educational

70

85

L35_1

Glorious Garden Block 2

Residential

75

84

L36_2

Lung Mun Oasis Block 2

Residential

75

81

L36_3

Lung Mun Oasis Block 2

Residential

75

83

L36_4

Lung Mun Oasis Block 3

Residential

75

83

L36_5

Lung Mun Oasis Block 3

Residential

75

83

L36_6

Lung Mun Oasis Block 4

Residential

75

83

L36_7

Lung Mun Oasis Block 4

Residential

75

84

L36_8

Lung Mun Oasis Block 5

Residential

75

83

L36_10

W.F.B. Avalokitesvara Nursery School

Educational

70

87

L37_1

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

83

L37_2

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

85

L37_3

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

80

L38_1

Lung Yat Estate Kin Lung House

Residential

75

82

L38_2

Lung Yat Estate Kin Lung House

Residential

75

79

L38_3

Lung Yat Estate Hong Lung House

Residential

75

76

L39_1

Hong Kong Christian Service Jockey Club Lodge of Rising Sun

Residential

75

79

L40_1

SKH St. Peter's Church (Castle Peak)

Place of Worship

70

74

L40_2

SKH St. Peter's Church (Castle Peak)

Place of Worship

70

74

L42_1

S.K.H St. Peter's Church Castle Peak Kindergarten & Child Care Centre

Educational

70

76

L42_2

S.K.H St. Peter's Church Castle Peak Kindergarten & Child Care Centre

Educational

70

78

L78_1

Cannan Garden

Residential

75

86

L88_1

Village houses near Yip Wong Road

Residential

75

82

PN1_1

Public Housing Development at Yip Wong Road (Block 4)

Residential

75

81

PN1_2

Public Housing Development at Yip Wong Road (Block 4)

Residential

75

81

PN1_4

Public Housing Development at Yip Wong Road (Block 4 - Kindergarten at 1/F Lower Floor)

Educational

70

81

Notes:

[1] Bold and underlined values denote exceedance over the corresponding noise criteria.

[2] Noise criteria of 75 dB(A) for all domestic premises (including temporary housing accommodation) hotels and hostels, 70 dB(A) for educational institution and places for public worship for conservatism, whereas 65 dB(A) for examination period.

 

4.7.2        The predicted noise levels are in the range of 71 dB(A) to 91 dB(A). Predicted noise levels at some of the representative NSRs exceed over the corresponding construction noise criteria. Based on this, direct mitigation measures are required to mitigate the potential noise impact on the affected NSRs during construction phase.

4.7.3        The total number of dwellings, classrooms and other noise sensitive receivers that will be exposed to noise impact exceeding the criteria set in Annex 5 in the EIAO-TM were evaluated and it is estimated that a total of about 3,777 dwellings, 550 classrooms and 17 other NSRs will be exposed to construction noise impact under unmitigated scenario.

Operation Phase Road Traffic Noise

4.7.4        Road traffic noise prediction has been carried out at representative NSRs for LFR Portion and HWR Portion. The affected NSRs requiring direct noise mitigation measures are summarized in Table 4.9 with details presented in Appendices 4.8.1 and 4.8.2 for LFR Portion and HWR Portion, respectively.

Table 4.9 - Summary of affected NSRs requiring Direct Noise Mitigation Measures

NSR

Description

NAP

Assessment Point Elevation (mPD)

Type of Use

Noise Criteria, L10(1-hr), dB(A)

AM

PM

 

Predicted Noise Level in 2036, L10(1-hr),

Criteria for Direct Noise Mitigation

Predicted Noise Level in 2036, L10(1-hr),

Criteria for Direct Noise Mitigation

 

Overall

Project Roads

All Other Roads

Project Roads Exceed

Overall Exceed

Project Road Contribution

Direct Mitigation Measures Required

Overall

Project Roads

All Other Roads

Project Roads Exceed

Overall Exceed

Project Road Contribution

Direct Mitigation Measures Required

L27

Tsing Shan Tsuen No. 111A

L27_6_1

16.1

Residential

70

74

67

73

No

Yes

1.0

Yes

74

66

73

No

Yes

0.8

No

L27

Tsing Shan Tsuen No. 111A

L27_6_2

18.9

Residential

70

74

68

73

No

Yes

1.1

Yes

74

67

73

No

Yes

0.9

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_4

22.5

Educational

65

73

66

72

Yes

Yes

1.0

Yes

73

65

72

No

Yes

0.9

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_5

26.0

Educational

65

73

66

72

Yes

Yes

0.9

Yes

73

66

72

Yes

Yes

1.0

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_6

29.5

Educational

65

74

67

73

Yes

Yes

1.0

Yes

73

67

72

Yes

Yes

1.0

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_7

33.0

Educational

65

74

67

73

Yes

Yes

1.0

Yes

74

67

73

Yes

Yes

1.0

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_4

22.5

Educational

65

68

60

67

No

Yes

0.8

No

67

60

66

No

Yes

1.0

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_5

26.0

Educational

65

69

62

68

No

Yes

1.0

Yes

69

62

67

No

Yes

1.2

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_6

29.5

Educational

65

71

64

70

No

Yes

1.0

Yes

70

64

69

No

Yes

1.2

Yes

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_7

33.0

Educational

65

72

64

71

No

Yes

0.9

No

71

65

70

No

Yes

1.1

Yes

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_4_6

29.3

Educational

65

72

62

72

No

Yes

0.5

No

72

66

71

Yes

Yes

1.1

Yes

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_5_5

25.8

Educational

65

69

60

68

No

Yes

0.7

No

68

62

67

No

Yes

1.2

Yes

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_5_6

29.3

Educational

65

69

62

69

No

Yes

0.9

No

69

63

68

No

Yes

1.3

Yes

L36

Lung Mun Oasis Block 2

L36_3_26

80.5

Residential

70

70

62

69

No

No

0.8

No

71

64

70

No

Yes

1.0

Yes

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_2_6

23.6

Educational

65

72

64

71

No

Yes

0.8

No

73

66

72

Yes

Yes

1.0

Yes

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_5

20.1

Educational

65

68

60

67

No

Yes

0.6

No

68

61

67

No

Yes

1.0

Yes

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_6

23.6

Educational

65

69

61

68

No

Yes

0.7

No

69

63

68

No

Yes

1.1

Yes

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_7

27.1

Educational

65

70

62

69

No

Yes

0.8

No

71

64

69

No

Yes

1.1

Yes

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_8

30.6

Educational

65

71

63

70

No

Yes

0.7

No

71

65

70

No

Yes

1.0

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_3_1

16.9

G/IC

65

77

67

76

Yes

Yes

0.5

Yes

77

66

76

Yes

Yes

0.4

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_3_2

20.4

G/IC

65

77

67

76

Yes

Yes

0.5

Yes

77

66

76

Yes

Yes

0.4

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_3_3

23.9

G/IC

65

77

67

76

Yes

Yes

0.6

Yes

77

66

76

Yes

Yes

0.4

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_3_4

27.4

G/IC

65

77

67

76

Yes

Yes

0.5

Yes

77

66

76

Yes

Yes

0.4

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_4_2

14.5

G/IC

65

77

68

76

Yes

Yes

0.7

Yes

77

67

76

Yes

Yes

0.4

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_4_3

18.0

G/IC

65

77

69

76

Yes

Yes

0.8

Yes

77

68

76

Yes

Yes

0.6

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_4_4

21.5

G/IC

65

77

70

76

Yes

Yes

0.9

Yes

77

68

76

Yes

Yes

0.7

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_5_2

14.5

G/IC

65

76

68

75

Yes

Yes

0.7

Yes

76

67

75

Yes

Yes

0.5

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_5_3

18.0

G/IC

65

77

70

76

Yes

Yes

0.9

Yes

77

69

76

Yes

Yes

0.8

Yes

PN9

Proposed G/IC Facilities at Tsing Shan Tsuen

PN9_5_4

21.5

G/IC

65

77

70

76

Yes

Yes

1.0

Yes

77

69

76

Yes

Yes

0.7

Yes

 

[1] Bold and underlined values denote exceedance over the corresponding noise criteria.

[2] Detail of Road Traffic Noise Assessment for un-mitigated scenario shall refer to Appendix 4.8.1 and Appendix 4.8.2.

 

     “-“ denotes predicted overall noise level complies with noise criteria under unmitigated scenario.

 

4.7.5        The maximum predicted noise levels from “Project roads” during AM and PM peak in the unmitigated scenario are 68dB(A), 67dB(A) and 70dB(A) for residential premises, schools and G/IC respectively. The overall predicted noise levels at some of the representative NSRs would exceed the corresponding road traffic noise criteria of 70dB(A), 65dB(A) and 65dB(A) for residential premises, schools and G/IC, respectively. Based on this, direct mitigation on “Project roads” measures are required to mitigate the potential noise impact on the affected NSRs during operation phase.

 

4.8         MITIGATION OF ENVIRONMENTAL IMPACTS

Construction Noise

4.8.1        Since exceedance of relevant noise standards is predicted, practicable direct noise mitigation measures including the use of quality PME, noise barriers, noise enclosures, noise insulation fabric and quieter alternative construction methods are recommended to minimize the noise impact at the affected NSRs during non-restricted hours.

Use of Noise Barrier, Noise Insulation Fabric and Noise Enclosure

4.8.2        To alleviate the construction noise impact on the affected NSRs, noise barriers or enclosures would be erected to provide screening from the construction plant.  Noise barriers will become more effective when located immediately adjacent to the PME and be moved concurrently with the PME along the work site. The Contractor should be responsible for design of the noise barrier/enclosure with due consideration given to the size of the PME and the requirement of intercepting the line of sight between the NSRs and PME.  A typical design which has been used locally is a wooden framed barrier of superficial density no less than 14kg/m2 on a skid footing with 25mm thick internal sound absorptive lining. A typical configuration of noise barrier and portable noise enclosure is shown in Appendix 4.9.  Noise barriers should be erected/built in such a way with no openings or gaps on the joints, and should be long enough (e.g. at least five times greater than its height) or be bent around the noise sources to ensure the effectiveness. A cantilevered top cover would be required for the noise barriers to achieve screening benefits at the upper floors of NSRs. It is anticipated that suitably designed noise barriers/enclosures could achieve at least 5 to 10 dB(A) reduction for movable and stationary plants, respectively.

4.8.3        In addition, noise insulation fabric (the Fabric) would be installed for PME such as piling rigs and drilling rigs and the Fabric should be lapped such that there would be no opening or gaps on the joints.  With reference to MTRC Contract C4420 Tsim Sha Tsui Modification Noise Assessment Report for Variation of Environmental Permit (July 2003) and the technical data from manufacturer, a noise reduction of over 10 dB(A) could be achieved with the use of the Fabric.  As a conservative approach, a noise reduction of 10 dB(A) for the PME lapped with the Fabric was assumed in this assessment.

Quiet Construction Method / Quality Powered Mechanical Equipment

4.8.4        For sheet piles installation, “Press-in” method is more preferable than the use of traditional vibratory hammer due to lesser noise and vibration impact generated.  According to the EPD web page, the noise emission of “Press-in” method is 69 dB(A) at 7 m from the silent piler, which is more than 20 dB(A) quieter than the vibratory hammer.  The Contractor should prioritise the use of “Press-in” method over the traditional method if site conditions allowed.  However, “Press-in” method would also have its own limitations and thus it should not restrict Contractor to fully adopt the “Press-in” as long as the Contractor can demonstrate the full compliance of daytime noise criteria by using vibratory hammer with proper mitigation measures.

4.8.5        Traditional demolition method relies on excavator mounted hydraulic breaker to break concrete structures, however, operating hydraulic breaker would inevitably generate significant noise impact to the NSRs nearby. As confirmed by Project Engineer, it is feasible to adopt quieter demolition equipment (e.g. hydraulic crusher) in some activities as a mitigation measure. Using hydraulic crusher would create lesser noise impact to the NSRs. The Contractor should, subject to the actual site condition, proactively adopt quieter demolition equipment to carry out the demolition works, where practicable.

4.8.6        Apart from the above, the Contractor will be required to review and adopt quieter construction methods or technologies to further reduce the noise at its source as far as they are technically feasible and applicable for the proposed construction works. These include non-explosive chemical expansion agent, high pressure water jetting, hand-held concrete crusher, quieter type blade saw, and quieter type wire saw / diamond wire saw. These quieter equipment / construction methods, while not adopted in the assessment, shall be considered during the design, tendering and implementation stage of the construction works as appropriate.

4.8.7        The use of Quality PME (QPME) is considered a practical way to mitigate construction noise impact.  QPME is defined as a PME having actual SWL lower than the value specified in the GW-TM.  Sound power levels of different QPME are listed in Table 4.10. The type of QPME adopted in this assessment is for reference only.  The contractors may adopt alternative QPME as long as it can demonstrate that they would not result in construction noise impacts worse than those predicted in this assessment. 

 

Table 4.10 SWL of QPME adopted for Construction Noise Mitigation

QPME / Quiet PME

Reference Number

Brand

Model Number

SWL, dB(A)

Excavator, wheeled/tracked

EPD-10780

KOMATSU

PC138US-8

97

Asphalt Paver

EPD-01226R

VOLVO

ABG5770

104

Air Compressor

EPD-07503

AIRMAN

PDS55S-5C1

92

Crane, mobile

EPD-05797

Maeda

CC985S-1

91

Roller, vibratory

EPD-09720

SAKAI

SW502S-1

94

Generator, Silenced

EPD-08951

DENYO

DCA-25USI3

80

Crane, mobile

EPD-12289

SUMITOMO

SCX1500A-3

103

Breaker, electric hand-held, 10kg < mass < 18kg

OCUPME-004

/

/

103

Drill, hand-held (battery)

OCUPME-014

/

/

89

Drill rig, rotary type (diesel)

OCUPME-015

/

/

110

Forklift, LPG, output power ≤ 32kW, speed ≤ 10km/hr

OCUPME-018

/

/

104

Grout mixer

OCUPME-021

/

/

90

Grout pump

OCUPME-022

/

/

105

Jig-saw, hand-held, wood (electric)

OCUPME-024

/

/

99

Poker, vibratory, hand-held (electric)

OCUPME-027

/

/

102

Paint line marker (low pressure)

OCUPME-030

/

/

87

Dump truck,5.5 tonne <gross vehicle weight ≦ 38 tonne

OCUPME-046

/

/

105

Note:

Another QPME of equivalent SWL will be adopted when more than one item needed.

4.8.8        The plant inventory with incorporation of the above recommendation on the use of QPME is provided in Appendix 4.10.

Good Site Practices

4.8.9        It is also recommended to implement good site practices as far as practicable so as to further reduce the noise impact at NSRs. The following good site practices should be followed during the construction phase.

·        Only well-maintained plant should be operated on-site and should be served regularly during construction period;

·        Mobile plant, if any, should be sited as far from NSRs as possible;

·        Use of site hoarding as a noise barrier to screen noise at low level NSRs;

·        Machines and plant that may be in intermittent use should be shut down between works periods or should be throttled down to a minimum.

·        Silencers or mufflers on construction equipment should be utilized and be properly maintained during construction;

·        Plant known to emit noise strongly in one direction should, wherever possible, be orientated so that the noise is directed away from the nearby NSRs; and

·        Material stockpiles should be effectively utilized, wherever practicable, in screening noise from on-site construction activities.

 

4.8.10     Since NSRs H1 and H9 are located in close vicinity to the works area of the Project and Cycle Track between Tsuen Wan and Tuen Mun (Tuen Mun to So Kwun Wat), the contractor of the Project will continuously liaise with the Contractor of Cycle Track to avoid concurrent operation of PMEs. In view of the above measures, cumulative construction noise impacts on the NSR H1 and H9 with the Cycle Track Project will not be anticipated and thus not considered in the construction noise assessment.

4.8.11     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 Appendices 4.11.1 and 4.11.2. A summary of the predicted cumulative noise levels at the representative floor of representative NSRs is presented in Table 4.11. The predicted cumulative noise levels of the Project are in the range of 57dB(A) to 75dB(A).  Predicted noise levels at representative floor levels of selected NAPs are shown in Appendix 4.18.

Table 4.11 - Summary of Cumulative Construction Noise Assessment Results - Mitigated

NAP ID

NSR Description

Type of Use

Noise Criteria

Leq (30 min), dB(A)

Predicted Mitigated Maximum Construction Noise Level

Leq (30 min), dB(A)

H1_1

Sham Shing Temple Office

Office

75

69

H1_2

Sam Shing Temple

Place of Worship

70

67

H1_3

Sam Shing Hui Office

Office

75

67

H1_4

Fuk Tak Shrine

Place of Worship

70

70

H2_1

Palm Cove (Tower 6)

Residential

75

61

H2_2

Palm Cove (Tower 5)

Residential

75

61

H3_1

Dragon Inn Court (Block 4)

Residential

75

64

H3_2

Dragon Inn Court (Block 3)

Residential

75

65

H4_1

Tsing Yung Terrace Block 1

Residential

75

66

H5_1

Kam Fai Garden (Block 3)

Residential

75

67

H5_2

Kam Fai Garden (Block 3)

Residential

75

67

H5_3

Kam Fai Garden (Block 2)

Residential

75

67

H5_4

Kam Fai Garden (Block 2)

Residential

75

67

H5_5

Kam Fai Garden (Block 1)

Residential

75

67

H5_6

Kam Fai Garden (Block 1)

Residential

75

67

H5_7

Kam Fai Garden (Block 3)

Residential

75

66

H5_8

Kam Fai Garden (Block 3)

Residential

75

66

H5_9

Kam Fai Garden (Block 2)

Residential

75

66

H5_10

Kam Fai Garden (Block 2)

Residential

75

66

H5_11

Kam Fai Garden (Block 1)

Residential

75

66

H5_12

Kam Fai Garden (Block 1)

Residential

75

66

H6_1

Harvest Garden (Block 1)

Residential

75

67

H6_2

Harvest Garden (Block 1)

Residential

75

63

H7_1

Day Care Centre (G/F)

Homes for the Aged (Residential)

75

61

H7_2

Care & Attention Home (1/F-4/F)

Homes for the Aged (Residential)

75

61

H7_3

Activity Centre (5/F-8/F)

Residential

75

61

H8_1

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational

70

66

H8_2

Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School

Educational

70

66

H9_1

Semple Memorial Secondary School

Educational

70

62

H9_2

Four Gospel Church

Place of Worship

70

69

H10_1

Hanford Garden (Block 2)

Residential

75

75

H10_2

Hanford Garden (Block 2)

Residential

75

70

H10_3

Hanford Garden (Block 1)

Residential

75

65

H10_4

Hanford Garden (Block 1)

Residential

75

66

H10_5

Hanford Garden (Block 1)

Residential

75

66

H10_6

Hanford Garden (Block 3)

Residential

75

62

H10_7

Hanford Garden (Block 4)

Residential

75

71

H11_1

Sam Shing Estate

Residential

75

69

H11_2

The Salvation Army Sam Shing Nursery School

Educational

70

57

H12_1

Siu Lun Court (Sui Lun House)

Residential

75

67

H12_2

Siu Lun Court (Sui Lun House)

Residential

75

68

H12_3

Siu Lun Court (Sui Lun House)

Residential

75

64

H12_4

Siu Lun Court (Ka Lun House)

Residential

75

62

H12_5

Siu Lun Court (Fu Lun House)

Residential

75

60

H12_6

Siu Lun Court (Fu Lun House)

Residential

75

59

H24_1

JC Place (Tower 1)

Residential

75

59

H24_2

JC Place (Tower 1)

Residential

75

58

H54_1

Village House near Dragon Inn Court and Scenic Villa

Residential

75

64

L27_1

Tsing Shan Tsuen No. 83

Residential

75

65

L27_2

Tsing Shan Tsuen No. 82

Residential

75

67

L27_3

Tsing Shan Tsuen No. 98

Residential

75

67

L27_4

Tsing Shan Tsuen No. 113

Residential

75

68

L27_5

Tsing Shan Tsuen No. 114

Residential

75

68

L27_6

Tsing Shan Tsuen No. 111A

Residential

75

69

L30_1

Yan Chai Hospital No. 2 Secondary School

Educational

70

67

L30_2

Yan Chai Hospital No. 2 Secondary School

Educational

70

66

L31_3

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

65

L31_4

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

69

L31_5

Ju Ching Chu Secondary School (Tuen Mun)

Educational

70

67

L32_1

ICAC Training Camp

Educational

70

70

L32_2

ICAC Training Camp

Educational

70

70

L32_3

ICAC Training Camp

Educational

70

70

L32_4

ICAC Training Camp

Educational

70

70

L32_5

ICAC Training Camp

Educational

70

70

L32_6

ICAC Training Camp

Educational

70

70

L32_7

ICAC Training Camp

Educational

70

70

L32_8

ICAC Training Camp

Educational

70

69

L32_9

ICAC Training Camp

Educational

70

68

L33_1

Hong Chi Morninglight School

Educational

70

67

L33_2

Hong Chi Morninglight School

Educational

70

68

L33_3

Hong Chi Morninglight School

Educational

70

68

L35_1

Glorious Garden Block 2

Residential

75

67

L36_2

Lung Mun Oasis Block 2

Residential

75

64

L36_3

Lung Mun Oasis Block 2

Residential

75

66

L36_4

Lung Mun Oasis Block 3

Residential

75

66

L36_5

Lung Mun Oasis Block 3

Residential

75

68

L36_6

Lung Mun Oasis Block 4

Residential

75

67

L36_7

Lung Mun Oasis Block 4

Residential

75

68

L36_8

Lung Mun Oasis Block 5

Residential

75

68

L36_10

W.F.B. Avalokitesvara Nursery School

Educational

70

70

L37_1

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

67

L37_2

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

69

L37_3

The Church of Christ in China Hoh Fuk Tong Primary School

Educational

70

64

L38_1

Lung Yat Estate Kin Lung House

Residential

75

71

L38_2

Lung Yat Estate Kin Lung House

Residential

75

70

L38_3

Lung Yat Estate Hong Lung House

Residential

75

70

L39_1

Hong Kong Christian Service Jockey Club Lodge of Rising Sun

Residential

75

63

L40_1

SKH St. Peter’s Church (Castle Peak)

Place of Worship

70

58

L40_2

SKH St. Peter’s Church (Castle Peak)

Place of Worship

70

58

L42_1

S.K.H St. Peter’s Church Castle Peak Kindergarten & Child Care Centre

Educational

70

60

L42_2

S.K.H St. Peter’s Church Castle Peak Kindergarten & Child Care Centre

Educational

70

61

L78_1

Cannan Garden

Residential

75

70

L88_1

Village houses near Yip Wong Road

Residential

75

65

PN1_1

Public Housing Development at Yip Wong Road (Block 4)

Residential

75

70

PN1_2

Public Housing Development at Yip Wong Road (Block 4)

Residential

75

70

PN1_4

Public Housing Development at Yip Wong Road (Block 4 – Kindergarten at 1/F Lower Floor)

Educational

70

70

Notes:

[1] Bold and underlined values denote exceedance over the corresponding noise criteria.

[2] Noise criteria of 75 dB(A) for all domestic premises (including temporary housing accommodation) hotels and hostels, 70 dB(A) for educational institution and places for public worship for conservatism, whereas 65 dB(A) for examination period.

 

4.8.12     The mitigated construction noise levels arising from the Project at all the identified NSRs  comply with the EIAO-TM construction noise criteria, except during examination period of Chung Sing Benevolent Society Mrs. Aw Boon Haw Secondary School (H8), Yan Chai Hospital No.2 Secondary School (L30), Ju Ching Chu Secondary School (Tuen Mun) (L31), Independent Commission Against Corruption (ICAC) Training Camp (L32), Hong Chi Morninglight School (L33), WFB Avalokitesvara Nursery School (L36_10) and Church of Christ in China (CCC) Hoh Fuk Tong Primary School (L37) and Planned Kindergarten of the Public Housing Development at Yip Wong Road (PN1_4).

4.8.13     For the above-mentioned schools, the prediction result indicated that no exceedance is anticipated during non-examination period, while up to 5 dB(A) noise exceedance is expected to occur if works are to be conducted during the examination period. Due to the close proximity to the works sites, it is not feasible to adopt minimum separation distance.  As precautionary measures, terms will be specified in the contractual documents requiring Contractor to liaise with the school’s management for the schedule of construction works, to avoid carrying out noisy construction activities during examination period. Noisy construction activities, such as those to be carried out in work zone 3a, 3b, 3c, 3d and 4b would be scheduled to avoid examination periods of the nearby schools/education institutions when necessary.  With the particularly noisy construction activities not to be carried out during the examination periods, the mitigated construction noise impact would comply with the noise criterion, 65 dB(A).

4.8.14     With the implementation of the aforementioned mitigation measures, no adverse construction noise impact is anticipated at the NSRs due to the Project.

Operation Phase Road Traffic Noise

4.8.15     The predicted overall noise levels at the planned NSRs are found to exceed their relevant noise criteria under the with-Project unmitigated scenario. The noise exceedance at most of the planned NSRs would be mainly contributed by existing roads, e.g., Lung Mun Road, Lung Fu Road, Tsing Wun Road, Castle Peak Road / Castle Peak Bay, Tuen Mun Road, etc. Since there is no planning information related to these planned NSRs at the time of this study, relevant authorities including LandsD and PlanD are recommended to impose lease requirement or planning requirement on the future developers to incorporate noise mitigation measures for compliance of the relevant road traffic noise criteria/standard, with due consideration to uses with even more stringent criteria (e.g., 55 dB(A) for the use of diagnostic room/ward). Hence, provisions of direct mitigation measures at the “Project roads” for the planned NSRs, e.g., PN9, would not be further considered.

4.8.16     The alignment options for LFRSR NB and SB has been discussed in Chapter 2. Environmental factors have been considered and the proposed alignment option is generally preferred from environmental perspective.  With reference to Annex 13 of the EIAO-TM, where the predicted noise impacts exceed the applicable noise criteria, direct mitigation measures shall be considered and evaluated.

4.8.17     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 does not exceed the relevant standards and does not contribute to the overall noise levels by 1.0 dB(A) or more. Direct noise mitigation measures, including LNRS are proposed to mitigate adverse traffic noise impact on the affected NSRs.

4.8.18     Direct mitigation measure of LNRS proposed for the Project are summarized in Table 4.12. The locations and extent of LNRS are shown in Figure 4.3. In addition to the LNRS, 1.8m parapet wall would be provided along the western side of LFRSR NB and 0.5m parapet wall would be provided along remaining sides of LFRSR NB and SB as standard provisions.

Table 4.12 -  Proposed Noise Mitigation Measures

Proposed Noise Mitigation Measure

Location

Approximate Length, m (rounded off to the nearest 10m)

Concerned NSRs

LFRSR

LNRS

Proposed slip road LFRSR NB

470m

L27, L30, L31

LNRS

Proposed slip road LFRSR SB

670m

L36, L37

4.8.19     With the implementation of the recommended noise mitigation measures, predicted noise levels at some of the representative NSRs would comply with the traffic noise criteria. However, exceedance of the traffic noise would still be predicted at some of the representative NSRs due to existing roads. The predicted noise levels at the affected NSRs with the proposed noise mitigation measures are summarized in Table 4.13, with details given in Appendices 4.13.1, for LFR Portion.

Table 4.13 - Summary of Predicted Road Traffic Noise Assessment Results at the Affected NSRs – With Mitigation Measures

NSR

Description

NAP

Assessment Point Elevation (mPD)

Type of Use

Noise Criteria, L10(1-hr), dB(A)

AM

PM

 

Predicted Noise Level in 2036, L10(1-hr),

Criteria for Direct Noise Mitigation

Predicted Noise Level in 2036, L10(1-hr),

Criteria for Direct Noise Mitigation

 

Overall

Project Roads

All Other Roads

Project Roads Exceed

Overall Exceed

Project Road Contribution

Direct Mitigation Measures Required

Overall

Project Roads

All Other Roads

Project Roads Exceed

Overall Exceed

Project Road Contribution

Direct Mitigation Measures Required

L27

Tsing Shan Tsuen No. 111A

L27_6_1

16.1

Residential

70

73

64

73

No

Yes

0.6

No

73

63

73

No

Yes

0.4

No

L27

Tsing Shan Tsuen No. 111A

L27_6_2

18.9

Residential

70

74

65

73

No

Yes

0.7

No

74

64

73

No

Yes

0.6

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_4

22.5

Educational

65

73

63

72

No

Yes

0.6

No

72

63

72

No

Yes

0.5

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_5

26.0

Educational

65

73

64

72

No

Yes

0.5

No

73

63

72

No

Yes

0.6

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_6

29.5

Educational

65

73

64

73

No

Yes

0.6

No

73

64

72

No

Yes

0.6

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_1_7

33.0

Educational

65

74

64

73

No

Yes

0.6

No

73

64

72

No

Yes

0.7

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_4

22.5

Educational

65

68

58

67

No

Yes

0.4

No

67

58

66

No

Yes

0.6

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_5

26.0

Educational

65

69

60

68

No

Yes

0.6

No

68

60

67

No

Yes

0.7

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_6

29.5

Educational

65

70

61

70

No

Yes

0.5

No

70

61

69

No

Yes

0.7

No

L30

Yan Chai Hospital No. 2 Secondary School

L30_2_7

33.0

Educational

65

71

62

71

No

Yes

0.5

No

71

62

70

No

Yes

0.7

No

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_4_6

29.3

Educational

65

72

60

72

No

Yes

0.3

No

72

63

71

No

Yes

0.7

No

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_5_5

25.8

Educational

65

68

58

68

No

Yes

0.4

No

68

59

67

No

Yes

0.7

No

L31

Ju Ching Chu Secondary School (Tuen Mun)

L31_5_6

29.3

Educational

65

69

59

69

No

Yes

0.5

No

68

61

68

No

Yes

0.7

No

L36

Lung Mun Oasis Block 2

L36_3_26

80.5

Residential

70

70

59

69

No

No

0.4

No

70

61

70

No

No

0.6

No

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_2_6

23.6

Educational

65

72

62

71

No

Yes

0.4

No

72

63

72

No

Yes

0.6

No

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_5

20.1

Educational

65

68

57

67

No

Yes

0.3

No

68

59

67

No

Yes

0.6

No

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_6

23.6

Educational

65

69

58

68

No

Yes

0.4

No

69

60

68

No

Yes

0.7

No

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_7

27.1

Educational

65

70

60

69

No

Yes

0.5

No

70

62

69

No

Yes

0.6

No

L37

The Church of Christ in China Hoh Fuk Tong Primary School

L37_3_8

30.6

Educational

65

70

60

70

No

Yes

0.4

No

71

62

70

No

Yes

0.6

No

 

Notes:

[1] Bold and underlined values denote exceedance over the corresponding noise criteria.

[2] Details of Road Traffic Noise Assessment for mitigated scenario shall refer to Appendix 4.13.1.

 

 

 

4.8.20     Based on the traffic noise impact assessment results, the traffic noise impact prior to and after the commencement of the Project will be dominated by traffic noise generated by existing roads. It is estimated that there will be 8 existing residential dwellings and 10 existing classrooms will be protected by the proposed direct noise mitigation measures, i.e. their overall noise level will be reduced from exceedance to comply with respective criterion. Prior to the commencement of the Project, it is estimated that 1146 existing residential dwellings, 496 classrooms and 14 others NSRs already been subject to traffic noise impact due to the existing roads. The number of existing residential dwellings and classrooms subject to traffic noise impact will be increase to 1166 and 506 without noise mitigation measures. Upon exhausting all practicable direct noise mitigation measures, it is estimated that the number of existing residential dwellings and classrooms will be decreased to 1158 and 496 respectively. The numbers of other NSRs subject to traffic noise impact will remain the same before and after the provision of noise mitigation measures as the traffic noise are dominated by existing roads.      

4.9         EVALUATION OF RESIDUAL IMPACTS

Construction Noise

4.9.1        The predicted mitigated construction noise levels at all NSRs would comply with the relevant noise standards stipulated in EIAO-TM with the implementation of the mitigation measures as mentioned in Section 4.8.  The predicted construction noise levels at some of the schools would exceed the noise criterion of 65 dB(A) during their respective examination period.

4.9.2        Scheduling of noisy construction works outside school examination period would reduce the overall construction noise impacts at the NSRs and ensure compliance with the construction noise criterion.  The Contractor shall liaise with the school representative(s) to obtain the examination schedule in order to avoid noisy construction activities during school examination period and to schedule the construction activities in the vicinity of schools and kindergartens during summer recess as much as possible.  A construction noise management plan shall be prepared during the design / tendering and implementation stage of the construction works to verify the inventory of noise sources, assess the effectiveness and practicality of all identified measures and update the construction noise impact assessment and proposed noise mitigation measures as necessary.

4.9.3        With the implementation of the proposed mitigation measures, the predicted noise levels at the representative NSRs during construction phase would comply with the construction noise criteria. No residual noise impact is expected.

Operation Phase Road Traffic Noise

4.9.4        With the implementation of all the proposed direct noise mitigation measures, the noise contributions from Project roads to the overall noise levels at all NSRs would be less than 1.0 dB(A) and the predicted noise levels due to Project roads at all NRSs would comply with the relevant noise criteria except for the Planned NSRs PN9. Information would be given to the relevant departments including PlanD and LandsD. Detail traffic noise impact assessment based on the planned land use and building design should be included in lease requirement or planning requirement, where appropriate, to ensure noise mitigation measures, such as self-protecting building design, will be incorporated by the future developers for compliance of the road traffic noise standards and requirements of the EIAO/HKPSG, with due consideration to uses with more stringent criteria (e.g., 55 dB(A) for the use of diagnostic room/ward).

4.9.5        Results of the eligibility assessment for indirect technical remedies is presented in Appendix 4.14. Due to high prevailing noise levels and/or dominant noise contribution from existing roads, none of the NSRs are eligible for consideration for indirect technical remedies under the EIAO-TM.

 

4.10     ENVIRONMENTAL MONITORING AND AUDIT

Construction Phase

4.10.1     Based on the results of construction noise impact assessment given in Appendix 4.7, noise exceedances at some of the representative NSRs are predicted during construction of the Project under unmitigated scenario.  Noise monitoring is therefore recommended to be carried out during construction phase.  Regular environmental site audit is also recommended to be carried out during construction phase 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.

Operation Phase

4.10.2     Based on the results of the road traffic noise impact assessment given in Appendix 4.8.2 and Appendix 4.13.1, there is no adverse traffic noise impact anticipated from the Project with the implementation of the proposed mitigation measures. To verify the effectiveness of the proposed noise mitigation measures, road traffic noise levels should be monitored at representative NSRs during the first year after completion of road works. Details of the EM&A programme are provided in a stand-alone EM&A Manual.

4.11     CONCLUSION

Construction Phase

4.11.1     Construction noise impact assessment has been conducted for the representative NSRs identified within the Assessment Area.  Assessment results indicated 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 use of Quieter Construction Methods, QPME, provision of temporary movable noise barriers / enclosures and noise insulating fabric, avoiding concurrent uses of PME with other project and restriction of noisy construction activity during examination period.

4.11.2     A construction noise management plan shall be prepared during the design / tendering and implementation stage of the construction works, to verify the inventory of noise sources, assess the effectiveness and practicality of all identified measures and update the construction noise impact assessment and proposed noise mitigation measures as necessary. Noise monitoring has been recommended to be carried out during construction phase.  Regular environmental site audit has also been recommended to be carried out during construction phase to ensure proper implementation of mitigation measures and good site practices. 

Operation Phase

4.11.3     Road traffic noise impact assessment has been conducted for the representative NSRs identified within the Assessment Area.  Assessment results indicate that the predicted road traffic noise levels at some of the representative NSRs would exceed the noise criteria under unmitigated scenario.

4.11.4     With the implementation of noise mitigation measures including LNRS on some Project roads, the predicted noise levels at some of the NSRs would still exceed the relevant noise criteria. However, the exceedances were contributed by the Existing roads. The contributions from the Project roads to the overall noise levels at all NSRs are all less than 1.0 dB(A) and all the predicted noise levels of the Project roads would comply with the noise criteria.  Based on this, no adverse road traffic noise impact arising from the Project is anticipated.

 


[1] “Sound power levels of other commonly used PME” prepared by the Noise Control Authority

[2] The following SWL of the PMEs has made reference to previous EIA projects:

-         Electric Chain Saw refers to the approved EIA Report of Tuen Mun South Extension (AEIAR-236/2022)

-         Cherry Picker refers to the approved EIA Report of TRUNK ROAD T4 (AEIAR-231/2021)

-        Hydraulic crusher refers to the approved EIA Report of TRUNK ROAD T4 (AEIAR-231/2021)

-        Welding set refers to the approved EIA Report of TRUNK ROAD T4 (AEIAR-231/2021)