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Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment Scott Wilson Ltd October 2008 Final EIA Report i 04.Air Quality Impact (20080922) Table of Contents 4 AIR QUALITY IMPACTS ................................................................................................ 4-1 4.1 Introduction................................................................................................... 4-1 4.2 Environmental Legislation, Polices, Standards and Criteria ......................... 4-1 4.3 Identification Air Sensitive Receivers ........................................................... 4-2 4.4 Identification of Potential Air Quality Impacts ............................................... 4-7 4.5 Assessment Methodologies.......................................................................... 4-9 4.6 Evaluation of Air Quality Impacts................................................................ 4-22 4.7 Recommendations for Monitoring and Audit .............................................. 4-30 4.8 Conclusions ................................................................................................ 4-30 List of Tables Table 4-1 Hong Kong Air Quality Objectives Table 4-2 Tunnel Air Quality Guidelines (TAQG) Table 4-3 Details of the Representative Air Sensitive Receivers (ASRs) - Existing Table 4-4 Details of the Representative Air Sensitive Receivers (ASRs) – Planned Table 4-5 Vehicle Classification in EMFAC-HK Table 4-6 Sensitivity of Emission Inventory Table 4-7 Emission Factors for NOx in Year 2015 (g/mile-veh) Table 4-8 Emission Factors for RSP in Year 2015 (g/miles-veh) Table 4-9 Meteorological Conditions for CALINE4 Model (Worst-case Scenario) Table 4-10 Background Air Quality Table 4-11 Predicted Cumulative Worst Case Average NO2 Concentrations at Existing ASRs Table 4-12 Predicted Cumulative Worst Case Average NO2 Concentrations at Planned ASRs Table 4-13 Predicted Cumulative Worst Case Average RSP Concentrations at Existing ASRs Table 4-14 Predicted Cumulative Worst Case Average RSP Concentrations at Planned ASRs Table 4-15 Predicted Maximum NO2 Concentrations inside Full Noise Enclosures List of Figures Figure 4-1 Representative Air Sensitive Receivers Under EIAO Figure 4-2 Location of Tsuen Wan Air Quality Monitoring Station and Ching Pak House Automatic Weather Station Figure 4-3 Location of Concurrent Projects Figure 4-4 Location of Chimneys Figure 4-5 Predicted Cumulative Hourly NO 2 Concentration At Worst Hit Level (1.5m Above Ground)

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Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Final EIA Report i 04.Air Quality Impact (20080922)

Table of Contents

4 AIR QUALITY IMPACTS ................................................................................................4-1

4.1 Introduction................................................................................................... 4-1 4.2 Environmental Legislation, Polices, Standards and Criteria......................... 4-1 4.3 Identification Air Sensitive Receivers ........................................................... 4-2 4.4 Identification of Potential Air Quality Impacts ............................................... 4-7 4.5 Assessment Methodologies.......................................................................... 4-9 4.6 Evaluation of Air Quality Impacts................................................................ 4-22 4.7 Recommendations for Monitoring and Audit .............................................. 4-30 4.8 Conclusions................................................................................................ 4-30

List of Tables Table 4-1 Hong Kong Air Quality Objectives Table 4-2 Tunnel Air Quality Guidelines (TAQG) Table 4-3 Details of the Representative Air Sensitive Receivers (ASRs) - Existing Table 4-4 Details of the Representative Air Sensitive Receivers (ASRs) – Planned Table 4-5 Vehicle Classification in EMFAC-HK Table 4-6 Sensitivity of Emission Inventory Table 4-7 Emission Factors for NOx in Year 2015 (g/mile-veh) Table 4-8 Emission Factors for RSP in Year 2015 (g/miles-veh) Table 4-9 Meteorological Conditions for CALINE4 Model (Worst-case Scenario) Table 4-10 Background Air Quality Table 4-11 Predicted Cumulative Worst Case Average NO2 Concentrations at Existing

ASRs Table 4-12 Predicted Cumulative Worst Case Average NO2 Concentrations at Planned ASRs Table 4-13 Predicted Cumulative Worst Case Average RSP Concentrations at Existing ASRs Table 4-14 Predicted Cumulative Worst Case Average RSP Concentrations at Planned ASRs Table 4-15 Predicted Maximum NO2 Concentrations inside Full Noise Enclosures List of Figures Figure 4-1 Representative Air Sensitive Receivers Under EIAO Figure 4-2 Location of Tsuen Wan Air Quality Monitoring Station and Ching Pak House

Automatic Weather Station Figure 4-3 Location of Concurrent Projects Figure 4-4 Location of Chimneys Figure 4-5 Predicted Cumulative Hourly NO2 Concentration At Worst Hit Level (1.5m

Above Ground)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Final EIA Report ii 04.Air Quality Impact (20080922)

Figure 4-6 Predicted Cumulative Daily NO2 Concentration At Worst Hit Level (1.5m Above Ground)

Figure 4-7 Predicted Cumulative Daily RSP Concentration At Worst Hit Level (1.5m Above Ground)

List of Appendices Appendix 4-A Photos of Air Sensitive Receivers Appendix 4-B Road Link Map Appendix 4-C Adjustments on Exhaust Technology Fractions Appendix 4-D Estimated population in year 2015, 2020, 2025, 2030 Appendix 4-E Trips per VMT Appendix 4-F Details of Annual Traffic Census Core Station 5010, 5018, 5026, 5030 and

5035 Appendix 4-G Meteorology Information Appendix 4-H Sensitivity Test of Emission Inventory and Calculation of Emission Factors Appendix 4-I Speed Fraction Appendix 4-J Sensitivity Test Speed Fraction Appendix 4-K Surface Roughness Appendix 4-L Supplementary Information for CALINE4 Model Appendix 4-M Calculation of Portal Emission Appendix 4-N Photographic Survey for Chimney Inventory Appendix 4-O Request Letter and Responses for Chimney Inventory Appendix 4-P Chimney Emission Inventory Appendix 4-Q Calculation of Air Quality Inside Full Noise Enclosure Appendix 4-R Sample Input Files of EMFAC-HK Model Appendix 4-S Sample Input Files of CALINE4 Model Appendix 4-T Sample Input Files of ISCST3 Model Appendix 4-U Predicted Worst Case Average Pollutant Concentrations at ASRs

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

4 AIR QUALITY IMPACTS

4.1 Introduction

4.1.1 Proposed scope of the Project includes upgrading and widening of Tsuen Wan Road (TWR) for 2.8km between Tuen Mun Road (TMR) and Kwai Tsing interchange, as well as associated improvement works for connected local roads and interchanges.

4.1.2 For the construction stage of the Project with works including civil, structural, drainage, geotechnical and landscaping works, traffic control and surveillance systems, traffic aids and street lighting works etc. would possibly create air quality impact to the adjacent air sensitive receivers (ASRs). For operational phase, increase of traffic flow due to the upgrading of existing TWR would be also possible to generate additional air quality impact to the surrounding ASR.

4.1.3 Hence, it is necessary to carry out air quality impact assessment to try controlling and minimizing the potential air quality impact to the ASRs associated with the Project. Besides, necessary air mitigation measures for non-compliance of the Air Quality Objectives (AQOs) should be considered, if necessary.

4.1.4 This section summarizes the identified sources of air quality impact during both the construction and operational phases. Representative ASRs have been identified and the potential air quality impacts to these receivers arising from associated impacts have been evaluated. Appropriate mitigation measures have been proposed, as and when required, in order to alleviate the potential air quality impacts to acceptable levels.

4.2 Environmental Legislation, Polices, Standards and Criteria

Air Quality Objectives 4.2.1 Hong Kong’s air quality is regulated through the Air Pollution Control Ordinance

(APCO). The APCO specifies AQOs, which are the statutory limits for a number of pollutants and the maximum allowable number of times that these may be exceeded over specified periods.

4.2.2 The AQOs form the statutory criteria for evaluating air quality impacts and are reproduced in Annex 4 of the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM) as standards for EIA purposes as shown in Table 4-1.

Table 4-1 Hong Kong Air Quality Objectives

Maximum Average Concentration (µg/m3) (1)

Parameter 1 Hour (2) 8 Hours (3) 24 Hours (3) Annual (4)

Sulfur Dioxide (SO2) 800 ---- 350 80 Total Suspended Particulates (TSP) 500 (1) (5) ----- 260 80

Respirable Suspended Particulates (RSP) ----- ----- 180 55

Nitrogen Dioxide (NO2) 300 ----- 150 80 Carbon Monoxide (CO) 30,000 10,000 ----- -----

Final EIA Report 4-1 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Maximum Average Concentration (µg/m3) (1)

Parameter 1 Hour (2)

Final EIA Report 4-2 04.Air Quality Impact (20080922)

8 Hours (3) 24 Hours (3) Annual (4)

Photochemical Oxidants (as Ozone) (6) 240 ---- ---- ----

Notes: 1) Measured at 298 K and 101.325 kPa (one atmosphere). 2) Not to be exceeded more than three times per year. 3) Not to be exceeded more than once per year. 4) Arithmetic mean. 5) Not an AQO, but an EIAO-TM criterion for construction dust impact assessment. It is accepted that an hourly-

averaged TSP concentration of 500 µg/m3 should not be exceeded. 6) Photochemical oxidants are determined by measurement of ozone only.

Tunnel Air Quality Guidelines 4.2.3 In addition to the statutory AQO limits, air pollutant concentration of various common

vehicular gaseous emission recommended in Tunnel Air Quality Guidelines (TAQG) specified under the EPD’s “Practice Notes on Control of Air Pollution in Vehicle Tunnel, 1995” should not exceed inside road tunnels or full noise enclosures. Table 4-2 presents these guideline values.

Table 4-2 Tunnel Air Quality Guidelines (TAQG)

Maximum Concentration Air Pollutant Averaging

Time (min) µg/m3 ppm Carbon Monoxide (CO) 5 115,000 100 Nitrogen Dioxide (NO2) 5 1,800 1 Sulfur Dioxide (SO2) 5 1,000 0.4

Note: All limits are expressed at reference conditions of 298K and 101.325kPa. 4.2.4 In addition to the foregoing, visibility in tunnels or full noise enclosures should be

controlled to a maximum level equivalent to an extinction coefficient of 0.005 m-1 during any 5 minutes interval.

4.3 Identification Air Sensitive Receivers

4.3.1 ASRs were identified in accordance with Annex 12 of the EIAO-TM. These include any domestic premises, hotels, hostels, temporary housing accommodation, hospitals, medical clinics, educational institutions, offices, factories, shops, shopping centres, places of public worship, libraries, courts of law or performing arts centres.

4.3.2 Existing ASRs were identified with reference to the latest information provided on the survey maps and further confirmed by actual site conditions as per site surveys and inspections in the mid of August 2007. Planned ASRs have also been identified with reference to the latest published Outline Zoning Plans (OZPs). Relevant site photos to justify the actual condition of the ASRs are given in Appendix 4-A.

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

4.3.3 For the case of the planned residential developments of the Kowloon Canton Railway Corporation (KCRC) at TW5, TW6 and TW7 as well as TWTL 394, the latest approved master layout plans available at the time working on this assessment have been taken into consideration.

4.3.4 Besides, latest comments provided by Planning Department on 25 May 2007 regarding the podium levels and building heights (refer to Appendix 3-B) have been adopted.

4.3.5 Details of the identified representative ASRs and their land uses for the air quality assessment are illustrated in Table 4-3 and

4.3.6 Table 4-4, for existing and planned receivers respectively. Corresponding locations of the identified representative ASRs are shown in Figure 4-1.

Table 4-3 Details of the Representative Air Sensitive Receivers (ASRs) - Existing

ASR No. Description Land Use No. of Storey

Podium (P) / Site (S) Levels

(mPD) (1)

Horizontal Distance to the

Site Boundary (m)

Existing ASRs 1 Allway Gardens Block A Residential 22 57.1 (P) 240

2 Tsuen Wan Adventist Hospital Staff Quarter Residential 5 44.2 (S) 200

3 Summit Terrace Block 2 Residential 39 37.1 (P) 140 4 Summit Terrace Block 3 Residential 40 37.1 (P) 120 5 Summit Terrace Block 5 Residential 40 37.1 (P) 100 6 Kong Nam Industrial Building Industrial 26 11.1 (S) 20 7 The Panorama Residential 43 30.4 (P) 40 8 Wang Fat Ching She Place of Worship 2 25.3 (S) 210 9 Lok Shun Seaview Factory Building Industrial 14 4.1 (S) 10

10 Serenade Cove Block B Residential 32 13.7 (P) 140 11 Golden Bear Industrial Centre Industrial 25 4.4 (S) 5 12 Wong Siu Ching Secondary School School 6 4.0 (S) 100 13 Clague Garden Estate Block A Residential 40 4.0 (S) 20 14 Clague Garden Estate Block B Residential 40 4.0 (S) 50 15 Clague Garden Estate Block C Residential 40 4.0 (S) 30

16 Salvation Army Ng Kok Wai Memorial Kindergarten School 2 5.1 (S) 10

28 Skyline Plaza Residential 35 23.4 (P) 130 29 Vision City Tower 1 Residential 41 38.4 (P) 230 30 Vision City Tower 2 Residential 43 38.4 (P) 270

Within Site Boundary (3)31 Tsuen Wan Park Recreational ----- 5.8 (S)

35 No. 57 Yeung Uk Road Residential 5 4.0 (S) 280

Final EIA Report 4-3 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

ASR No. Description Land Use No. of Storey

Podium (P) / Site (S) Levels

(mPD) (1)

Horizontal Distance to the

Site Boundary (m)

Existing ASRs 36 Tsuen Wan Caritas Clinic Clinic 4 4.0 (S) 310 41 Texaco Road Industrial Centre Industrial 16 4.0 (S) 60 56 Waterside Plaza Block 1 Residential 37 18.2 (P) 60 57 Waterside Plaza Block 2 Residential 37 18.2 (P) 60 58 Waterside Plaza Block 3 Residential 32 19.5 (P) 70 59 Waterside Plaza Block 4 Residential 31 19.5 (P) 80

60 Shak Chung Shan Memorial Catholic Primary School School 7 4.5 (S) 160

62 160 63

Riviera Gardens Tower 22 Residential 30 22.3 (P) 165

64 Metropolitan Industrial & Warehouse Building No.2 Industrial 22 4.8 (S) 0 (2)

0 (2)65 Leader Industrial Centre Phase I & II Industrial 15 4.9 (S) 0 (2)66 Tak Fung Industrial Centre Industrial 26 4.0 (S)

67 Kerry Godown (Tsuen Wan) Industrial 17 21.8 (S) 20 68 Chun Shing Factory Estate Industrial 25 20.2 (S) 10

69 Wing Kei Road 5-A-Side Soccer Pitch Recreational ----- 15.6 (S) 5

0 (2)70 Broadway Centre Industrial 23 20.0 (S) 71 S K H Chu Tan Primary School School 6 61.0 (S) 140 72 Kwai Shing West Estate Block 8 Residential 24 61.0 (S) 130 73 Lee I Yao Secondary School School 5 26.5 (S) 70

0 (2)74 Wing Kin Industrial Building Industrial 26 7.3 (S) 75 Kingsford Industrial Building Phase 1 Industrial 26 7.6 (S) 20 76 Waford Industrial Building Industrial 12 7.6 (S) 20 77 Marvel Industrial Building Block B Industrial 16 5.9 (S) 110 78 Kwai Tak Industrial Building Block 2 Industrial 11 5.0 (S) 120 79 Kwai Shun Street Playground Recreational ----- 5.5 (S) 150 80 Profit Industrial Building Industrial 15 5.7 (S) 220 81 Kwai Shun Industrial Centre Industrial 12 5.4 (S) 230 82 Lai King Catholic Secondary School School 5 7.2 (S) 500

83 Lai King Estate Fung King House Residential 14 18.3 (S) 500

84 Supermarket at G/F of the Panorama Commercial 1 11.3 (S) 65

85 Shop at G/F of Skyline Plaza Commercial 1 4.2 (S) 100

86 Shopping Centre of Vision City Commercial ----- 4.3 (S) 225

87 Allway Gardens Shopping Arcade Commercial 2 52.1 (S) 240

Final EIA Report 4-4 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

ASR No. Description Land Use No. of Storey

Podium (P) / Site (S) Levels

(mPD) (1)

Horizontal Distance to the

Site Boundary (m)

Existing ASRs

88 Shopping Centre of Waterside Plaza Commercial 1 4.4 (S) 60

89 Riviera Gardens Tower 22 – G/F Commercial 1 6.9 (S) 160 Notes: 1) (P) for podium level and (S) for site level. 2) ASRs are located adjacent to the site boundary, i.e. horizontal distance to the Site boundary equals to 0m. 3) Since part of Tsuen Wan Park is located beneath the Tsuen Wan Road viaduct, part of this ASR is within site boundary.

Table 4-4 Details of the Representative Air Sensitive Receivers (ASRs) – Planned

ASR No.

Description Land Use No. of Storey

Podium (P) / Site (S) Levels

(mPD) (1)

Horizontal Distance to the

Site Boundary (m)

Planned ASRs 17 Development at TW5 Bayside Tower 1 Residential 49 30.6 (P) 80 18 Development at TW5 Bayside Tower 2 Residential 42 30.6 (P) 90 19 Development at TW5 Bayside Tower 3 Residential 42 30.6 (P) 110 20 Development at TW5 Bayside Tower 4 Residential 39 30.6 (P) 90 21 Development at TW5 Bayside Tower 5 Residential 39 30.6 (P) 60 22 Development at TW5 Bayside Tower 6 Residential 42 30.6 (P) 20 23 Development at TW5 Bayside Tower 7 Residential 42 30.6 (P) 10 24 Development at TW5 Bayside Tower 8 Residential 42 30.6 (P) 10 25 Development at TW5 Bayside Tower 9 Residential 42 30.6 (P) 10 26 Development at TW5 Cityside Tower 10 Residential 50 33.2 (P) 10 27 Development at TW5 Cityside Tower 11 Residential 52 33.2 (P) 70 32 Tsuen Wan Town Lot 394 Tower 1 Residential 44 30.6 (P) 180 33 Tsuen Wan Town Lot 394 Tower 2 Residential 44 30.6 (P) 170 34 Tsuen Wan Town Lot 393 Commercial ----- 4.3 (S) 130 37 40 38

Development at TW6 Tower 1 Residential 48 23.5 (P) 50

39 50 40

Development at TW6 Tower 2 Residential 46 23.5 (P) 50

42 10 43

Development at TW7 Tower 1 Residential 44 20.5 (P) 10

44 10 45

Development at TW7 Tower 2 Residential 44 20.5 (P) 10

46 Development at TW7 Tower 3 Residential 44 20.5 (P) 10

Final EIA Report 4-5 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

ASR No.

Description Land Use No. of Storey

Podium (P) / Site (S) Levels

(mPD) (1)

Horizontal Distance to the

Site Boundary (m)47 10 48 10 49

Development at TW7 Tower 4 Residential 42 20.5 (P) 10

50 10 51

Development at TW7 Tower 5 Residential 42 20.5 (P) 20

52 5 53

Development at TW7 Tower 6 Residential 40 20.5 (P) 10

54 10 55

Development at TW7 Tower 7 Residential 40 20.5 (P) 20

61 Proposed School Site at TW7 School 6 17.5 (S) 80 Note: 1) (P) for podium level and (S) for site level.

Final EIA Report 4-6 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

4.4 Identification of Potential Air Quality Impacts

Construction Phase 4.4.1 Potential air quality impacts during the construction phase are primarily due to fugitive

dust emission. Typical dust generating construction activities include traffic and utility diversion, piling works, substructure construction, superstructure construction, earthworks for retaining wall construction and finishing works.

4.4.2 Construction work of this Project would commence in June 2011 and until June 2015 tentatively. In general, it is expected that no extensive underground construction work would be conducted throughout the construction phase, but mainly at-grade road pavement construction and pre-cast viaduct elements for on-site installations.

4.4.3 In addition, construction works would be carried out in different phases to minimize number of parallel operations, in order to avoid the adverse environmental impact to the surrounding sensitive receivers. The tentative construction programme and works areas are shown in Figure 2-3 and Figure 2-4, respectively. Potential fugitive dust emissions for each work stage would be finite as only limited construction plants would be operated in each work area. Hence, it is anticipated that heavy amount of dust emission will not be generated.

4.4.4 With the implementation of proper air quality impact mitigation measures as shown in Section 4.6.3, insignificant adverse air quality impacts would be generated from the construction activities.

4.4.5 Furthermore, referring to the construction programme of the Project, there would be 4 potential interfacing projects (as shown in Figure 4-3) taking place in the proximity of the assessment area (500m from the Project Boundary). The concurrent projects are:

• Reconstruction and Improvement of Tuen Mun Road (Anticipated Completion Year: 2011): Construction of noise barriers at sections of Tsuen Wan (close to the Panorama, Belvedere Garden, Greenview Court and Yau Kom Tau Village) and Sam Shing Hui;

• Property Development at Tsuen Wan West Station TW5 (Anticipated Completion Year: 2015 – 2016): Construction: Construction of residential blocks and relevant facilities;

• Property Development at Tsuen Wan West Station TW6 (Anticipated Completion Year: 2011 – 2012): Construction of residential blocks and relevant facilities; and

• Property Development at Tsuen Wan West Station TW7 (Anticipated Completion Year: 2012 – 2014): Construction of residential blocks and relevant facilities.

4.4.6 For Reconstruction and Improvement of Tuen Mun Road, the adjacent construction work areas of the Project include (1) Connections of Viaduct N1, (2) Connections of Viaduct S1, (12) Viaduct N1 and (22) Viaduct S1 (numbers refer to Figure 2-4), which major construction tasks are scheduled from June 2011 to January 2015 (refers to Figure 2-3). Therefore, there would be only a short overlap between the projects. Furthermore, this project aims for the provision of noise barriers and associated works and thus the scale of construction activity is considered as small. Hence, it is

Final EIA Report 4-7 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

anticipated that the cumulative air quality impact associated with Reconstruction and Improvement of Tuen Mun Road would be minor.

4.4.7 For Property Development at Tsuen Wan West Station TW5, the adjacent construction work areas of the Project include (29 to 33) Viaduct S4 to S8 and (16 to 20) Viaduct N4 to N8 (numbers refer to Figure 2-4), which major construction tasks are scheduled from January 2012 to January 2015 (refers to Figure 2-3), while for Property Developments at Tsuen Wan West Station TW6 and TW7, the adjacent construction work areas of the Project include (23, 24, 32 to 34 and 39) Viaduct 7 to 11 and Wall 5 and (13, 19 to 21) Viaduct N7 to N10 (numbers refer to Figure 2-4), which major construction tasks are scheduled from January 2012 to January 2015 (refers to Figure 2-3).

4.4.8 Therefore, the construction works of these property developments would potentially coincide with the Project.

4.4.9 However, these property developments would be confined in small work areas and involve typical construction activities. The scale of the property developments would be relatively small and the number of construction equipment employed would be limited.

4.4.10 It is also noteworthy that it is mandatory for Contractors to implement dust suppression measures as stipulated in the Air Pollution Control (Construction Dust) Regulation.

4.4.11 Moreover, it is remarkable that part of Property Developments TW5 (bay-side) will be constructed above the existing West Rail Station, which structure was designed to cater this future development, and thus the extent of dusty construction activities of TW5 (such as piling and substructure) would be minimized.

4.4.12 As a result, construction dust impact due to these concurrent projects would be localised, temporary and surmountable. Hence, adverse cumulative construction dust impacts due to these property developments would not be anticipated.

Operational Phase 4.4.13 Potential air quality impact during the operational phase of Tsuen Wan Road and other

major existing road networks would be dominated by vehicle gaseous emissions arising from road traffic.

4.4.14 Air quality impacts, associated with road traffic are caused mostly by Carbon Monoxide (CO), Nitrogen Dioxide (NO2) and Respirable Suspended Particulates (RSP). Owing to the much higher AQO limit comparing with other major parameters of air quality impact, non-compliance of CO is not envisaged in general, if the NO2 concentrations are below the AQO standards. Therefore, only 1-hour and 24-hour concentrations of NO2 and RSP were calculated and compared with the AQO limits.

4.4.15 In order to estimate the cumulative air quality impact, pollutant-emitting activities in the Study Area were considered in the air quality impact assessment. The following emission sources were included in the cumulative air quality impact:

• Vehicle gaseous emissions from open sections of existing and planned road networks within 500m from the Site Boundary;

Final EIA Report 4-8 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

• Portal emission from the proposed and existing full noise enclosures; and

• Chimney emissions arising from nearby industrial premises within 500m from the Site Boundary.

4.4.16 Besides, length of the proposed full noise enclosures for road traffic noise mitigation in this Project ranges from 58m to 110m. Owing to the longitudinal transport of pollutants promoted by the movement of traffic, as well as the meteorological condition and the turbulence generated by the passing vehicles, air pollutants arising from vehicles emissions would be confined inside noise enclosure structures. In this connection, air quality inside the tunnel is also critical and was assessed based on the traffic flow features.

4.5 Assessment Methodologies

Construction Phase 4.5.1 During the construction phase, manner of work conducted by the Contractor should

comply with the statutory practice specified on the Air Pollution Control (Construction Dust) Regulations, which specifies management techniques and practices to control air quality impacts arising from fugitive emissions. Further details of appropriate techniques are presented in Section 4.6.3.

Operational Phase 4.5.2 In general, the assessment area for this air quality impact assessment is defined by a

distance of 500m from the project boundary as given under the EIA study brief. Figure 4-1 illustrates schematically the project boundary and assessment area for air quality impact assessment.

4.5.3 As mentioned in Section 4.4.15, potential air quality impact during the operational phase of Tsuen Wan Road project includes the following potential sources.

• Vehicle gaseous emissions from open sections of existing and planned road networks in Tsuen Wan Road;

• Portal emission from the proposed and existing full noise enclosures; and

• Chimneys emissions arising from nearby industrial premises.

4.5.4 Besides the potential air pollution sources, background air quality levels in this assessment area was considered for the purpose of evaluating the cumulative constructional and operational air quality impacts. Details are further elaborated in Section 4.5.66.

Vehicle Gaseous Emission from Open Road Sections

Emission Factors of Vehicle Gaseous Emission 4.5.5 The cumulative air quality impact generated by vehicle gaseous emission from open

road sections and portals were estimated based on the highest emission strength given by the combination of traffic flow and vehicle mixture. The latest version of “EMFAC-HK” provided by EPD was adopted to determine the total emission inventory, and subsequently generate the appropriate vehicle emission factors for each type of vehicle.

Final EIA Report 4-9 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

The results were input to open road source dispersion model and portal emission calculation to predict the cumulative air quality impact.

4.5.6 Referring to Appendix I of EMFAC-HK Guideline, details of the procedures and assumptions for the use of “EMFAC-HK” are given following sections, whereas the input files of EMFAC-HK model were given in Appendix 4-R.

Assumptions of adopting EMFAC-HK Model in the EIA Study

Vehicle Classes 4.5.7 Vehicle Classes are referred to all vehicles operating on roads within 500m from the

project boundary that were categorized into 16 vehicle classes in accordance to the Appendix I of EMFAC-HK Guideline as shown in Table 4-5.

Table 4-5 Vehicle Classification in EMFAC-HK

Vehicle Class EMFAC-HK Notation Descriptions Gross Vehicle

Weight

MC 1 PC+LGV(1) Petrol Private Cars & Light Goods Vehicles ALL

MC 3 PC+LGV(3) Diesel Private Cars & Light Goods Vehicles <=2.5 tonne <=2.5ton

MC 4 LGV(4) Light Goods Vehicles >2.5-3.5 tonne >2.5-3.5ton

MC 5 PLB Public Light Buses ALL

MC 6 LGV(6) Light Goods Vehicles >3.5 tonne >3.5ton – 5.5ton

MC 7 HGV(7) Medium Goods Vehicles with GVW <15 tonne >5.5ton – 15ton

MC 8 HGV(8) Medium & Heavy Goods Vehicles with GVW >=15 tonne >15ton

MC 10 FBDD Double Deck Franchised Buses ALL

MC 11 MC Motor Cycles ALL

TAXI 3 Taxi Taxi ALL

TAXI 4 PV(4) Private Light Buses <=3.5 tonne <=3.5ton

TAXI 5 PV(5) Private Light Buses >3.5 tonne >3.5ton

TAXI 6 NFB(6) Non-franchised Buses <=6.4 tonne <=6.4ton

TAXI 7 NFB(7) Non-franchised Buses 6.4-15 tonne >6.4ton – 15ton

TAXI 8 NFB(8) Non-franchised Buses >15 tonne >15ton

Final EIA Report 4-10 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Vehicle Class EMFAC-HK Notation Descriptions Gross Vehicle

Weight

TAXI 10 FBSD Single Deck Franchised Buses ALL

Road Grouping 4.5.8 Roads within the Study Area were grouped into two types, namely Trunk Roads and

Local Roads, which were characterised by continuous flow and interrupted flow respectively. Hence two sets of emission factors for the two road types were calculated. The associated Road Link Map is shown in Appendix 4-B.

Exhaust Technology Fractions 4.5.9 The underlying assumptions in EMFAC-HK are that the vehicle can be categorized into

unique technology groups with each technology group representing vehicles with distinct emission control technologies, which have similar in-use deterioration rates, and respond the same to repair.

4.5.10 Exhaust Technology Fraction for each vehicle class has adopted from the information provided in the Up to Date Vehicle Licensed Number by Age and Technology Group Fractions from EPD's website. However, since there is no further information available after year 2003, exhaust technology fraction for each vehicle class are then assumed to be the same as proportion in year 2003 as a conservative approach. In addition, some adjustments have been made according to Appendix II of the EPD Guideline on Modelling Vehicle Emissions, Implementation Schedule of Vehicle Emission Standards in Hong Kong (Updated as at 17 August 2005). Details of adjustments in each vehicle class are shown in Appendix 4-C.

Evaporative Technology Fractions 4.5.11 Default values and compositions are adopted in this Study, referring to the EPD

Guideline on Modelling Vehicle Emissions.

Vehicle Population 4.5.12 Refer to the EPD Guideline on Modelling Vehicle Emissions, the latest vehicle age

distribution data provided in the EPD’s website (Year 2003) has been adopted in this study with exception to the population of private car, taxi, public light bus and private light bus >3.5ton. Corresponding population has been calculated and shown in Appendix 4-D. Details on the assumptions adopted for the abovementioned vehicle population are presented below.

Private Car 4.5.13 As the implementation of Vehicle Emission Standards, there was no new registration of

diesel private car in Hong Kong after 1998. Hence, population of private car is considered 100% using petrol fuel in this Study, and number of diesel private car subsequent to year 1998 is then regrouped into petrol type.

Taxi 4.5.14 As the implementation of Vehicle Emission Standards, new registration of diesel taxi

was banned in Hong Kong on 1st August 2001. 100% of LPG taxies were therefore

Final EIA Report 4-11 04.Air Quality Impact (20080922)

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assumed in this study and diesel taxi subsequent to 1st August 2001 was then regrouped into LPG fuel type.

Public Light Bus (PLB) 4.5.15 An incentive scheme has been implemented by Environmental, Transport and Works

Bureau (ETWB) to encourage the replacement of diesel light buses with LPG type since 2002. Refer to the Up to Date Vehicle Licensed Number by Age and Technology Group Fractions provided in EPD's website, 28% of diesel and 72% of LPG public light buses were newly registered in 2003, however there was no further information available after 2003. Proportions of diesel and LPG PLB were then assumed as same as year 2003 for those vehicles registered after 2003 as a conservative approach.

Private Light Bus >3.5ton 4.5.16 An incentive scheme has been implemented by Environmental, Transport and Works

Bureau (ETWB) to encourage the replacement of diesel light buses with LPG type since 2002. Refer to the Up to Date Vehicle Licensed Number by Age and Technology Group Fractions provided in EPD's website, 50% of diesel and LPG private light buses (>3.5ton) were newly registered in 2003. Since there was no further information available after 2003, proportions of diesel and LPG were then assumed 50% respectively for those vehicles registered after 2003 as a conservative approach.

Accrual Rate 4.5.17 Since there was absence of forecast information in the model year and hence “Default

values and compositions” are adopted referred to EMFAC-HK Guideline.

Daily Trips 4.5.18 With reference to the EPD Guideline on Modelling Vehicle Emissions, the diurnal

variation of daily trips is used to estimate the cold start emission of petrol vehicles. Hence, trips for vehicle other than petrol type vehicle would be assumed zero. In contrast, estimations on number of trips for petrol type vehicle in different road types are considered as following, where associated Road Link Map is shown in Appendix 4-B.

Trunk Road Sections 4.5.19 It was assumed that number of trips in the trunk road sections would be zero, as no cold

start would be considered in the trunk road section under normal circumstance.

Local Road Sections 4.5.20 It was assumed that the number of trips equal to the number of cold start in these

sections. For assuming number of trips is direct proportion to VMT and pattern is similar throughout Hong Kong territory. Number of trips in this Study Area was then estimated by multiplying VMT within Study Area and Trips per VMT within Hong Kong .

AreaStudy withinHK wihtin

HK within VMT VMT Trip ×=

4.5.21 Trips per VMT within Hong Kong were calculated based on the default data of EMFAC-HK, whereas VMT within Study Area was calculated by multiplying the number of vehicle and the length of road travelled in this Study Area. Corresponding trips per VMT are shown in Appendix 4-E.

Final EIA Report 4-12 04.Air Quality Impact (20080922)

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Daily Vehicle Mile Travelled (VMT) 4.5.22 Vehicle-Mile-Travelled (VMT) was inputted in the model, which represents the total

distance travelled on a weekday. The regional specific VMT was calculated by multiplying vehicle flow and section length with reference to the Final TIA Report issued by Scott Wilson in January 2007 in association with MVA Hong Kong Ltd.

4.5.23 Diurnal traffic pattern was inputted to simulate the effect of different traffic pattern. In order to determine the proportion of estimated daily traffic flow variation, hourly traffic flow at Kwai Chung Road (KCR), Core Station No. 5030 was adopted, as it is the nearest available core station to the Study Area and directly interfaces with the TWR, according to Annual Traffic Census 2006 by Transport Department (TD). Location of nearby core stations and extracted information from Transport Department are shown in Appendix 4-F.

4.5.24 It should be noted that information from other stations No. 5010, 5018, 5026 and 5035 were not adopted since their comparatively remote locations to the assessment area (please refer to Figure 1 in Appendix 4-F.), as well as the difference of vehicle proportion (characteristic), which do not match with the TIA report that already endorsed by TD.

4.5.25 Diurnal traffic variation for various vehicle types are then estimated based on the "Table of Vehicle Classification and Occupancy" extracted from Appendix A1 of Annual Traffic Census 2006. Those assumptions of referencing information from core station 5030 were adopted with no comment from TD.

Hourly Temperature and Relative Humidity Profile 4.5.26 According to the information provided by Hong Kong Observatory, nearest

meteorological station of this Project is Ching Pak House Automatic Weather Station, with anemometer height of 136m. By considering the characteristic of Ching Pak House Automatic Weather Station would be representative to this Study Area, annual and monthly hourly average ambient temperature and relative humidity obtained from this station are adopted in the model. The adopted values are shown in Appendix 4-G.

Model Year 4.5.27 For the purpose of finding the worst scenario year, sensitivity test for emission

inventory among 15 years after the commencement of the Project is carried out, which are Year 2015, 2020, 2025 and 2030. Based on emission control schemes in the testing years with varied VMT of corresponding years, four sets of emission inventory with emission factors were produced and provided in Appendix 4-H. Emission Factors in the year that with the largest emission inventory is used as the model year of the air quality impact assessment (AQIA) for worst-case scenario prediction associated with vehicular gaseous emission.

4.5.28 The peak hour travel speeds for Yr 2015, 2020, 2025 and 2030 were adopted in the sensitivity test, which were calculated based on the peak traffic flow of the corresponding year & V/C ratio. By using the peak hour flow in each year, it was found year 2015 is the worst scenario year and hence emission factors in year 2015 would be adopted in this Study.

Final EIA Report 4-13 04.Air Quality Impact (20080922)

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4.5.29 Default value 45 years (between Starting Model Year and Final Model Year) was used to include 45 model years. The Calendar Years were set as “2015”, “2020”, “2025”, and “2030” respectively.

Speed Fractions 4.5.30 To simulate the effect of different road speed during the rush and non-rush hour,

sensitivity test had been carried out. The design road speed limits were assumed for representing the situation during non-rush hour; while the vehicle speed of peak hour flow was adopted representing the situation during the rush hour. The estimated speed fractions of year 2015, 2020, 2025 and 2030 were shown in Appendix 4-I.

4.5.31 The peak flow hour travel speeds were calculated based on the peak traffic flow in Year 2015 and volume/capacity ratio of different road types. To obtain the speed fractions of each vehicle type, the vehicle speeds of each road were first calculated and weighed by VMT. The estimated speed fractions of model year in 2015 were adopted in the sensitivity test, as it was the worst scenario year among assessment years according to the model year sensitivity test described in Section 4.5.28.

4.5.32 In the model, same road speeds were applied to all hours to demonstrate the effect of using peak flow speed and design speed. The worst emission factors were selected for predicting the vehicle emissions. Results of Sensitivity Test are shown in Appendix 4-J.

Modelling Modes

Scenario Type 4.5.33 “Burden Mode” was the only scenario that can consider and provide the hourly

vehicular emissions according to the diurnal variations of vehicle-kilometer-travelled (VKT), trips, ambient temperature, relative humidity and speed.

Output Frequency 4.5.34 Hourly average emission factors were derived for the purpose of obtaining worst

emission factor.

Procedure of EMFAC-HK Applications

Emission Inventories 4.5.35 For trunk road sections, only “Run Exhaust” was considered as it was characterised by

continuous flow, whereas “Start Exhaust” and “Run Exhaust” were considered for local road sections because of the cold start emissions including.

Calculation of Emission Factors 4.5.36 Further as the results from EMFAC-HK were given in different type of fuel, hourly

emission factors were then calculated by dividing total emission inventory by total VKT in each vehicle class in each hour, in order to obtain representative and generic emission factors for these vehicle categories. For example: Emission Factor of LGV is:

Final EIA Report 4-14 04.Air Quality Impact (20080922)

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Emission Factor = Σ(Emission Inventory)i / Σ(VKT)i

VKT VKT VKTEmission Emission Emission

DSLCATNCAT

DSLCATNCAT++

++=

where NCAT = Non Catalyst;

CAT = Catalyst; and DSL= Diesel

4.5.37 The maximum value of calculated hourly emission factors in grams per miles per vehicle were then selected for the incorporation into the air quality impact assessment for a conservative approach.

Emission Factors for Each Road Link 4.5.38 Composite emission factors for road links were calculated by the weighted average of

the emission factors of sixteen different types of vehicles. Contribution of total emission factors by all identified line-sources (road links) within 500m-assessment area has been included in the sensitivity test. Details of the sensitivity analysis are shown in Appendix 4-H and Table 4-6 summarizes the findings.

Table 4-6 Sensitivity of Emission Inventory

Total Emission Inventory (g/s) Yr 2015 Yr 2020 Yr 2025 Yr 2030

NOx (TR) 8.97 6.43 5.61 5.84 NOx (LR) 4.54 3.21 2.85 3.03 RSP (TR) 0.47 0.24 0.22 0.24 RSP (LR) 0.37 0.19 0.17 0.19

4.5.39 In Table 4-6, it was noted that greater emission inventory is resulted for both NOx and RSP in Year 2015. Therefore, Year 2015 was selected as the worst-case model year for the air quality impact assessment, whereas the calculated emission factors for different vehicle categories were list in Table 4-7 and Table 4-8.

Table 4-7 Emission Factors for NOx in Year 2015 (g/mile-veh)

NOx E.F. g/mile-veh Vehicle Class Description

Trunk Road Local Road

MC 1 Petrol Private Cars & Light Goods Vehicles 0.127 0.178

MC 3 Diesel Private Cars & Light Goods Vehicles <=2.5 tonne 0.421 0.455

MC 4 Light Goods Vehicles 2.5-3.5 tonne 0.285 0.308

MC 5 Public Light Buses 0.173 0.162

MC 6 Light Goods Vehicles >3.5 tonne 2.441 2.637

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NOx E.F. g/mile-veh Vehicle Class Description

Trunk Road Local Road

MC 7 Medium Goods Vehicles with GVW <15 tonne 4.934 5.258

MC 8 Medium & Heavy Goods Vehicles with GVW >=15 tonne 6.116 6.520

MC 10 Double Deck Franchised Buses 3.276 3.784

MC 11 Motor Cycles 1.150 1.229

TAXI 3 Taxi 0.231 0.289

TAXI 4 Private Light Buses <=3.5 tonne 0.000* 0.000*

TAXI 5 Private Light Buses >3.5 tonne 0.252 0.255

TAXI 6 Non-franchised Buses <=6.4 tonne 1.796 1.933

TAXI 7 Non-franchised Buses 6.4-15 tonne 4.222 4.559

TAXI 8 Non-franchised Buses >=15 tonne 4.487 4.856

TAXI 10 Single Deck Franchised Buses 2.777 3.229 *There is NO Private Light Bus <3.5t within this Study Area

Table 4-8 Emission Factors for RSP in Year 2015 (g/miles-veh)

RSP E.F. g/mile-veh Vehicle Class Description

Trunk Road Local Road

MC 1 Petrol Private Cars & Light Goods Vehicles 0.004 0.008

MC 3 Diesel Private Cars & Light Goods Vehicles <=2.5 tonne 0.104 0.180

MC 4 Light Goods Vehicles 2.5-3.5 tonne 0.063 0.110

MC 5 Public Light Buses 0.097 0.151

MC 6 Light Goods Vehicles >3.5 tonne 0.147 0.255

MC 7 Medium Goods Vehicles with GVW <15 tonne 0.243 0.415

MC 8 Medium & Heavy Goods Vehicles with GVW >15 tonne 0.223 0.380

MC 10 Double Deck Franchised Buses 0.079 0.154

MC 11 Motor Cycles 0.041 0.065

Final EIA Report 4-16 04.Air Quality Impact (20080922)

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RSP E.F. g/mile-veh Vehicle Class Description

Trunk Road Local Road

TAXI 3 Taxi 0.016 0.033

TAXI 4 Private Light Buses <=3.5 tonne 0.000* 0.000*

TAXI 5 Private Light Buses >3.5 tonne 0.140 0.224

TAXI 6 Non-franchised Buses <=6.4 tonne 0.053 0.093

TAXI 7 Non-franchised Buses 6.4-15 tonne 0.145 0.254

TAXI 8 Non-franchised Buses >15 tonne 0.131 0.229

TAXI 10 Single Deck Franchised Buses 0.093 0.184 *There is NO Private Light Bus <3.5t within this Study Area

Traffic Flow Condition 4.5.40 Forecasted AM peak traffic flow and vehicle mixture of the major roads related to this

Project in Year 2015 was adopted as the basis of worst-case scenario traffic condition (refer to Final TIA Report, issued by Scott Wilson Ltd in January 2007 in association with MVA Hong Kong Ltd., as attached in Appendix 3-H). In accordance with the endorsed Final TIA Report, the AM peak traffic flow would larger in volume than PM peak traffic flow. The AM peak traffic flows were hence adopted in the assessment of nighttimes traffic flows of selected year of assessment, as a conservative approach.

Open Road Emission 4.5.41 Dispersion model CALINE4, based on the Gaussian diffusion equations employing a

mixing zone concept to characterise pollutant dispersion over roadways, was used to assess the operational traffic air quality impacts upon the identified representative ASRs.

Meteorological Condition 4.5.42 Due to its incapability of CLAINE4 in handling lengthy data, the meteorological

conditions adopted to predict the worst-case pollutant concentrations at identified ASRs are presented in Table 4-9. The estimation of surface roughness is presented in Section 4.5.43.

Table 4-9 Meteorological Conditions for CALINE4 Model (Worst-case Scenario)

Meteorological Parameter

Daytime Scenario Nighttime Scenario

Time Period 7:00 AM – 7:00 PM 7:00 PM – 7:00 AM (Next Day) Stability class D F Standard deviation of wind direction 22.79o 6.93o

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Meteorological Parameter

Daytime Scenario Nighttime Scenario

Wind speed 1 m/s Wind direction Worst case for each receiver Worst case for each receiver Surface roughness height 302 cm Mixing height 500 m Temperature 298 K

Surface Roughness Height in the Study Area 4.5.43 Since the Project area is adjacent to urban area and water surface, a weighted surface

roughness length with respect to prevailing wind direction was evaluated, which was considered to be the best describing the actual surface roughness that could be adopted in this assessment. The weighted surface roughness length shown in Table 4-9 was estimated by considering the ratio of water surface area to urban area portion within the 500 m assessment area for air quality impact assessment. Justifications on the determination of the surface roughness length are provided in Appendix 4-K.

Methodology of CALINE4 Computer Modelling 4.5.44 Due to the wide range of road segments elevated from +3.5mPD to +60mPD within the

Study Area, whereas identified ASRs with the elevation ranged from ground level (+5mPD) up to +61mPD, open road emission was modelled in separated files. Details of methodologies are elaborated as follow.

Road Elevations 4.5.45 In view of default input settings of CALINE4 computer simulation analysis for free-

flow vehicular line source emission in open air environment, maximum acceptable range of vertical height input on road segments for valid computation is positive altitude within a 10m bandwidth (e.g. 0mPD to +10mPD, +10mPD to +20mPD etc.) In other words, input of road segment height at negative altitude or out of the range of that 10m bandwidth would be considered as null input for valid computation.

4.5.46 As wide range of road segments elevated from +2mPD to +88mPD were presented in this assessment, road sections were divided into nine categories according to their height, which were 0-10mPD, 10-20mPD, 20-30mPD, 30-40mPD, 40-50mPD, 50-60mPD, 60-70mPD, 70-80mPD,and 80-90mPD respectively.

ASRs Elevations 4.5.47 In order to assess the worst scenario of air quality impact to human, assessments for

portal emission from full noise enclosures were conducted at 1.5m above ground level or podium level and 3 additional assessment levels covering the building heights to obtain the worst hit concentration.

4.5.48 Another limitation of CALINE4 program is that the input of air impact assessment receptors must be either within the 10m bandwidth abovementioned in accordance with the elevation of road segments, or at any higher elevations. In other words, input of the receptors lower than the bandwidth of road segment category in consideration was not able to be model from the simulation program.

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4.5.49 In order to take into account all identified ASRs within the 500m assessment area boundary with the elevation ranged from ground level (+5mPD) up to +61mPD, all input height of the identified ASRs originally lower than the bandwidth of road segment category in consideration were set with reference point at the lowest level of that bandwidth +1.5m (simulate the normal elevation from ground). Supplementary information provided in Appendix 4-L illustrates schematically the abovementioned ASRs input methodology.

4.5.50 The estimated pollutant concentrations from every category were then accumulated at each ASR respectively. Consequently, the vehicular emissions contributed from every road sections would be taken into account at each ASR, and hence the total concentration level at each ASR by vehicular emissions by all roads within 500m from work boundary was obtained.

Effects of Noise Mitigation Measures 4.5.51 Potential air quality impacts arising from the implementation of roadside noise

mitigation measures (vertical barriers, cantilever noise barriers, semi-enclosures and full-enclosures) were also incorporated into the air quality model. Locations of existing and proposed noise mitigation measures on the Tsuen Wan Road are shown in Figure 3-5, Appendices 3-I and 3-J.

4.5.52 It was assumed that, with the installation of vertical noise barriers, all the traffic pollutants generated from the mitigated road section would be emitted from the top of the noise barriers as a worst-case consideration. In the CALINE4 model, the elevation of the mitigated road section was set to the elevation of the barrier top, and the road type was set to 'fill'. No correction or adjustment to the receiver heights was made in the model.

4.5.53 For the cantilever noise barriers or semi-enclosures, it was assumed that the dispersion of the traffic pollutants would be adjusted to physically shifting the mitigated road section towards edge of the canopies horizontally. Vehicular gaseous pollutant was assumed to be emitted from the top of the canopies as a worst-case consideration. In the CALINE4 model, alignment of the mitigated road section was shifted by a distance equal to the covered extent, the elevation of the mitigated road section was set to the elevation of the barrier top, and the road type was set to 'fill'. No correction or adjustment to the receiver heights is required for the model.

Portal Emission from Full Noise Enclosures 4.5.54 In order to assess the worst scenario of air quality impact to human, assessments for

portal emission from full noise enclosures were conducted at 1.5m above ground level or podium level and 3 additional assessment levels covering the building heights to obtain the worst hit concentration.

4.5.55 Portal emissions from full noise enclosures were modelled in accordance with the Permanent International Association of Road Congress Report (PIARC, 1991). Pollutants are assumed to be ejected from the openings of full noise enclosures as a portal jet such that two-third (2/3) of the total emission is dispersed within the first 50 m of the portal and the remaining one-third (1/3) of the total emission within the second

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50 m. Details of the calculation of portal emission and the locations of portal emissions considered in the assessment are given in Appendix 4-M.

4.5.56 The closest and most representative Hong Kong Observatory (HKO) meteorological station to the Project area is Ching Pak House (with anemometer height 136 metres above mean sea level) automatic weather station. The hourly meteorological data in year 2006 obtained from this station was used as the meteorological inputs for the modelling of portal emissions due to the implementation of full noise enclosures. The portal emissions were modelled as volume sources by using the Industrial Source Complex Short Term (ISCST3). The location of meteorological station is shown in Figure 4-2.

Chimney Emissions from Industrial Premises 4.5.57 Since the Project is located in the vicinity of the industrial premises in Tsuen Wan and

Kwai Chung, cumulative impact of potential industrial chimney emissions were considered necessary and included in the cumulative air quality impact assessment.

4.5.58 Within the air quality assessment area (500 m from the Project Boundary), chimney inventory was achieved from Technical Appendices - Environmental Impact Assessment Reports of Section 16 Application for Development Tsuen Wan West (TW5, TW6 and TW7) West Rail, Phase 1 by Kowloon-Canton Railway Corporation.

4.5.59 The chimney inventory has been validated and updated by conducting site photographic survey (at both ground and elevated levels) and checking with the management offices/tenants of the subjected industrial premises by sending request letters, which are shown in Appendix 4-O and Appendix 4-P respectively.

4.5.60 There are totally 106 chimney emission sources identified and the chimney locations are summarized and presented in Figure 4-3.

4.5.61 In order to assess the worst scenario of air quality impact to human, assessments for chimney emissions from nearby industrial premises were conducted at 1.5m above ground level or podium level and 3 additional assessment levels covering the building heights to obtain the worst hit concentration.

4.5.62 Since only SO2 was evaluated in these EIA Reports, therefore it is necessary to deduce the fuel consumption rates by SO2 emission rates in accordance with Table 1.3-1 Criteria Pollution Emission Factors for Fuel Oil Combustion of USEPA AP-42. The detail calculation and assumptions made on chimney emission inventory are given in Appendix 4-P. The ISCST3 dispersion model was used to predict the chimney emission (as point source) from nearby industrial premises. Same set of meteorological data in 2006 at Ching Pak House automatic weather station was used for simulation.

Determination of Proportion of NO2 from NOx

4.5.63 CALINE4 dispersion model is used for calculation of NOx and RSP concentrations by open road traffic. For the calculation of NO2 concentrations, the vehicular emission factors for NOx were used and the conversion factor from NOx to NO2 is assumed to be 20% for open road emission sources.

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4.5.64 ISCST3 dispersion model was used to calculate the NOx and RSP concentration from portal emission of full noise enclosures and chimney emissions. Same NO2 conversion factor of 20% is adopted for chimney emissions and portal emission.

4.5.65 In order to obtain the daily average air pollutant concentrations, a factor 0.4 was used to convert the maximum hourly levels to daily average concentrations as suggested by Brode, R.W., 1988 – “Screening Procedures for Estimating the Air Quality Impact of Stationary Sources”. On the other hand, referring to EPA-450/4-88-010, U.S. Environmental Protection Agency, Research Triangle Park, N.C., U.S.A., p 4-17, this factor applies to convert the short-term concentrations estimated by screening models to long terms concentrations.

Background Air Quality Levels 4.5.66 With reference to the latest five years averaged monitoring data from EPD monitoring

station at Tsuen Wan, background air pollutant concentrations are shown in Table 4-10, which have been adopted in this air quality impact assessment. The 5-year-average background air quality levels were obtained from year 2001 to year 2006, except that of year 2003 (since data in 2003 is not representative) in the nearest EPD air quality monitoring station located in Tsuen Wan (i.e. Princess Alexandra Community Centre, 60 Tai Ho Road). The location of air quality monitoring station is given in Figure 4-2.

Table 4-10 Background Air Quality

Air Pollutant 5-year Average Concentration (μg/m3)(1)

Sulfur Dioxide (SO2) 24.0 Total Suspended Particulates (TSP) 77.2 Respirable Suspended particulates (RSP) 56.4 Nitrogen Dioxide (NO2) 64.2 Carbon Monoxide (CO) 747.2

Note: 1) Due to the close proximity of the monitoring station to the project area, the figures can be adopted as background

air quality data in Tsuen Wan.

Cumulative Operational Air Quality Impacts 4.5.67 Cumulative air quality impacts at all identified ASRs for NO2 and RSP were calculated

by the summation of the modelling results of vehicular emission from free-flow road links (by CALINE4), emission from openings of full noise enclosures (ISCST3) and chimney emission from the nearby industries (ISCST3), together with the respective background concentrations.

Air Quality inside Full Noise Enclosures 4.5.68 Full noise enclosures were proposed in this EIA study along the proposed Tuen Mun

and Kowloon bound viaducts. Location of these enclosures is provided in Figure 3-5.

4.5.69 Air quality inside the sections of the full noise enclosures was studied as the case similar to tunnels, since the air pollutants could be confined in the enclosed space inside the enclosures with longitudinal transport of pollutants. A conversion factor of

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12.5% including tailpipe NO2 emission (taken as 7.5% of NOx) plus 5% of NO2/NOx for tunnel recommended in PIARC91 for air expelled from the tunnel was adopted in this assessment as the inside enclosure conversion factor.

4.5.70 Two scenarios were considered for the air quality evaluation inside the full noise enclosures – normal traffic flow condition and congested traffic flow condition. Appendix 4-Q shows the detailed calculation of the inside tunnel air quality assessments for the sections of the full enclosures, after the implementation of the proposed noise mitigation measures.

4.6 Evaluation of Air Quality Impacts

Construction Phase 4.6.1 Among those works mentioned in Section 4.4.1, work stages / activities which will

generate fugitive dust emission would include the following:-

• Traffic and utility diversion;

• Piling works;

• Substructure construction;

• Superstructure construction;

• Earthworks for retaining wall construction; and

• Finishing works.

4.6.2 In general, it is anticipated that no extensive underground construction work and piling work would lead to massive fugitive dust emission, since all these works are mainly confined for at-grade road pavement construction and pre-cast viaduct elements ready for on-site installations.

4.6.3 The following site practices are recommended to be fully implemented by Contractor, in order to suppress dust emissions during construction work. Recommendations are represented in the form of contractual clauses:

• The Contractor shall undertake at all times to prevent dust nuisance as a result of his activities. Dust suppression measures such as water spraying are necessary and should be installed to ensure that the air quality at the boundary of the site and at any sensitive receivers complies with the AQOs.

• The Contractor shall notify any specific construction work as stated in the Air Pollution Control (Construction Dust) Regulation to the Authority before the commencement of such work.

• The Contractor shall apply for a license or permit under the requirements of the relevant legislation (e.g., Air Pollution Control Ordinance and its subsidiary regulations) wherever applicable.

• Watering of unpaved areas, access roads, construction areas and dusty stockpiles shall be undertaken at least eight times daily during dry and windy weather. Watering of the haul road shall be undertaken four to eight times daily during dry or windy weather. Water sprays may be either fixed or mobile to follow individual areas to be wetted as and when required. Application of suitable

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wetting agents, such as dust suppression chemicals, shall be used in addition to water, especially during the dry period (November to March).

• Effective water sprays shall be used during the delivery and handling of all raw sand and aggregate, and other similar materials, wet dust is likely to be created and to dampen all stored materials during dry and windy weather.

• Stockpiles of sand, aggregate or any other dusty materials greater than 20m3 shall be enclosed on three sides, with walls extending above the pile and 1 metre beyond the front of the pile.

• Suitable chemical wetting agent such as dust suppression chemical shall be used on completed cuts and fills to reduce wind erosion.

• Areas within the construction site where there is a regular movement of vehicles shall have a paved surface and be kept clear of loose surface material.

• The Contractor shall restrict all motorized vehicles within the construction site, excluding those on public roads, to maximum speed of 20 km per hour and confine haulage and delivery vehicles to designated roadways inside the Site.

• Construction working areas will be restricted to a minimum practicable size.

• The Contractor shall ensure that no earth, rock or debris is deposited on public or private rights of way as result of his activities, including any deposits arising from the movement of plant or vehicles.

• The Contractor shall provide a wheel washing facility at the exits from work areas to the satisfaction of the Engineer. Water in wheel washing facilities and sediment shall be changed and removed respectively at least once a month.

• The Contractor shall submit details of the wheel washing facilities; such shall be usable prior to any earthworks excavation activity on the construction site. The Contractor shall also provide a hard-surfaced road between any washing facility and the public road.

• In the event of any spoil or debris from construction works being deposited on adjacent land, or streams, or any silt being washed down to any area, then all such spoil, debris or material and silt shall be immediately removed and the affected land and areas restored to their natural state by the Contractor to the satisfaction of the Engineer.

• If spoil cannot be immediately transported out of the Site, stockpiles should be stored in sheltered areas.

• Plant and vehicles shall be inspected annually to ensure that they are operating efficiently and that exhaust emissions are not causing a nuisance. All Site vehicle exhausts should be directed vertically upwards or directed away from ground.

• Dust monitoring will be included in the EM&A Manual at the most affected ASRs. In general, 24-hour total suspended particulates and 1-hour total suspended particulates are required to be measured at the most affected ASRs.

• Path for complaints and handling procedures should be set up and implement.

Final EIA Report 4-23 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Operational Phase

Air Quality from Open Roads 4.6.4 Taking into account vehicular exhaust emission from open road networks, portal

emission from full noise enclosure, chimney emission from industrial premises and the background pollutant concentration, the worst cumulative 1-hour NO2, 24-hour NO2 and 24-hour RSP concentrations among the four assessment levels of each ASRs were calculated and are presented in Table 4-11 to Table 4-14, whereas the details could be found in Appendix 4-U.

Table 4-11 Predicted Cumulative Worst Case Average NO2 Concentrations at Existing ASRs

ASR No. Description NO2 (μg/m3)

Existing ASRs Hourly

(Day time) Hourly

(Nighttime) Daily

1 Allway Gardens Block A 98.65 121.02 86.93 2 Tsuen Wan Adventist Hospital Staff Quarter 106.84 139.93 94.49 3 Summit Terrace Block 2 99.69 131.01 90.92 4 Summit Terrace Block 3 102.79 137.02 93.33 5 Summit Terrace Block 5 106.94 144.08 96.15 6 Kong Nam Industrial Building 135.38 188.88 114.077 The Panorama 112.39 133.67 91.99 8 Wang Fat Ching She 119.74 129.93 90.49 9 Lok Shun Seaview Factory Building 167.04 234.36 132.27

10 Serenade Cove Block B 108.26 128.39 89.88 11 Golden Bear Industrial Centre 137.00 178.85 110.0612 Wong Siu Ching Secondary School 123.19 155.95 100.9013 Clague Garden Estate Block A 144.56 185.33 112.6514 Clague Garden Estate Block B 124.25 164.87 104.4715 Clague Garden Estate Block C 145.17 190.18 114.5916 Salvation Army Ng Kok Wai Memorial Kindergarten 154.95 203.54 119.9428 Skyline Plaza 112.47 153.47 99.91 29 Vision City Tower 1 108.12 135.20 92.60 30 Vision City Tower 2 104.14 130.91 90.88 31 Tsuen Wan Park 206.18 257.58 141.5535 No. 57 Yeung Uk Road 126.18 165.10 104.5636 Tsuen Wan Caritas Clinic 135.31 168.76 106.0241 Texaco Road Industrial Centre 181.97 196.68 117.1956 Waterside Plaza Block 1 128.55 142.95 95.70 57 Waterside Plaza Block 2 125.30 139.18 94.19 58 Waterside Plaza Block 3 123.60 140.31 94.64

Final EIA Report 4-24 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

ASR No. Description NO2 (μg/m3)

Existing ASRs Hourly

(Day time) Hourly

(Nighttime) Daily

59 Waterside Plaza Block 4 124.30 138.99 94.12 60 Shak Chung Shan Memorial Catholic Primary School 119.60 134.86 92.46 62 119.06 131.24 91.02 63

Riviera Gardens Tower 22 122.11 134.81 92.44

64 Metropolitan Industrial & Warehouse Building No.2 184.30 246.76 137.2265 Leader Industrial Centre Phase I & II 172.37 227.64 129.5766 Tak Fung Industrial Centre 151.26 173.59 107.9667 Kerry Godown (Tsuen Wan) 168.35 197.49 117.5268 Chun Shing Factory Estate 174.35 248.54 137.9469 Wing Kei Road 5-A-Side Soccer Pitch 150.43 191.32 115.0570 Broadway Centre 160.20 229.17 130.1971 S K H Chu Tan Primary School 104.70 122.37 87.47 72 Kwai Shing West Estate Block 8 106.46 130.56 90.74 73 Lee I Yao Secondary School 141.58 200.92 118.8974 Wing Kin Industrial Building 174.63 236.63 133.1775 Kingsford Industrial Building Phase 1 124.45 178.09 109.7576 Waford Industrial Building 138.23 174.39 108.2877 Marvel Industrial Building Block B 147.99 176.81 109.2478 Kwai Tak Industrial Building Block 2 140.58 196.71 117.2179 Kwai Shun Street Playground 169.71 242.69 135.6080 Profit Industrial Building 171.36 193.71 116.0181 Kwai Shun Industrial Centre 134.64 192.49 115.5282 Lai King Catholic Secondary School 145.47 188.45 113.9083 Lai King Estate Fung King House 172.78 248.88 138.0784 Supermarket at G/F of the Panorama 122.10 150.96 98.90 85 Shop at G/F of Skyline Plaza 118.32 160.09 102.5586 Shopping Centre of Vision City 123.42 164.80 104.4487 Allway Gardens Shopping Arcade 100.44 125.36 88.66 88 Shopping Centre of Waterside Plaza 131.11 147.70 97.60 89 Riviera Gardens Tower 22 – G/F 127.33 144.98 96.51

Notes: 1) All pollutant concentrations include the background concentration ([NO2] = 64.2 μg/m3).

Final EIA Report 4-25 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Table 4-12 Predicted Cumulative Worst Case Average NO2 Concentrations at Planned ASRs

ASR No. Description NO2 (μg/m3)

Planned ASRs Hourly

(Day time) Hourly

(Nighttime) Daily

17 Development at TW5 Bayside Tower 1 117.71 145.33 96.65 18 Development at TW5 Bayside Tower 2 115.40 142.38 95.47 19 Development at TW5 Bayside Tower 3 110.95 136.22 93.01 20 Development at TW5 Bayside Tower 4 111.81 140.62 94.77 21 Development at TW5 Bayside Tower 5 114.77 148.06 97.74 22 Development at TW5 Bayside Tower 6 126.87 178.10 109.76 23 Development at TW5 Bayside Tower 7 131.45 186.86 113.27 24 Development at TW5 Bayside Tower 8 131.83 184.03 112.13 25 Development at TW5 Bayside Tower 9 133.92 183.78 112.03 26 Development at TW5 Cityside Tower 10 130.34 169.41 106.28 27 Development at TW5 Cityside Tower 11 118.63 150.91 98.88 32 Tsuen Wan Town Lot 394 Tower 1 118.84 152.50 99.52 33 Tsuen Wan Town Lot 394 Tower 2 125.32 158.48 101.91 34 Tsuen Wan Town Lot 393 133.34 180.54 110.74 37 131.31 158.48 101.91 38

Development at TW6 Tower 1 133.83 158.91 102.08

39 137.78 157.90 101.68 40

Development at TW6 Tower 2 136.57 155.79 100.83

42 162.25 193.40 115.88 43

Development at TW7 Tower 1 163.73 192.96 115.70

44 164.53 193.58 115.95 45

Development at TW7 Tower 2 161.82 189.21 114.20

46 160.47 190.09 114.55 47

Development at TW7 Tower 3 153.63 192.06 115.34

48 148.75 194.26 116.22 49

Development at TW7 Tower 4 142.59 183.32 111.85

50 140.46 180.31 110.64 51

Development at TW7 Tower 5 141.40 176.14 108.97

52 156.88 197.79 117.64 53

Development at TW7 Tower 6 149.73 194.81 116.45

54 149.24 194.72 116.41 55

Development at TW7 Tower 7 147.22 192.68 115.59

61 Proposed School Site at TW7 139.19 150.08 98.55 Notes: 1) All pollutant concentrations include the background concentration ([NO2] = 64.2 μg/m3).

Final EIA Report 4-26 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

Table 4-13 Predicted Cumulative Worst Case Average RSP Concentrations at Existing ASRs

ASR No. Description RSP (μg/m3)

Existing ASRs Daily 1 Allway Gardens Block A 62.77 2 Tsuen Wan Adventist Hospital Staff Quarter 64.70 3 Summit Terrace Block 2 63.80 4 Summit Terrace Block 3 64.40 5 Summit Terrace Block 5 65.22 6 Kong Nam Industrial Building 70.94 7 The Panorama 64.32 8 Wang Fat Ching She 63.60 9 Lok Shun Seaview Factory Building 75.06

10 Serenade Cove Block B 63.74 11 Golden Bear Industrial Centre 68.98 12 Wong Siu Ching Secondary School 67.40 13 Clague Garden Estate Block A 69.74 14 Clague Garden Estate Block B 67.73 15 Clague Garden Estate Block C 69.51 16 Salvation Army Ng Kok Wai Memorial Kindergarten 71.28 28 Skyline Plaza 66.88 29 Vision City Tower 1 64.63 30 Vision City Tower 2 64.12 31 Tsuen Wan Park 76.02 35 No. 57 Yeung Uk Road 69.37 36 Tsuen Wan Caritas Clinic 69.58 41 Texaco Road Industrial Centre 71.58 56 Waterside Plaza Block 1 65.35 57 Waterside Plaza Block 2 64.95 58 Waterside Plaza Block 3 64.62 59 Waterside Plaza Block 4 64.43 60 Shak Chung Shan Memorial Catholic Primary School 64.48 62 63.83 63

Riviera Gardens Tower 22 63.98

64 Metropolitan Industrial & Warehouse Building No.2 77.82 65 Leader Industrial Centre Phase I & II 75.75 66 Tak Fung Industrial Centre 68.32 67 Kerry Godown (Tsuen Wan) 71.20

Final EIA Report 4-27 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

RSP (μg/m3) ASR No. Description

Existing ASRs Daily 68 Chun Shing Factory Estate 77.65 69 Wing Kei Road 5-A-Side Soccer Pitch 70.20 70 Broadway Centre 76.63 71 S K H Chu Tan Primary School 63.14 72 Kwai Shing West Estate Block 8 64.04 73 Lee I Yao Secondary School 72.80 74 Wing Kin Industrial Building 74.97 75 Kingsford Industrial Building Phase 1 70.21 76 Waford Industrial Building 69.81 77 Marvel Industrial Building Block B 69.19 78 Kwai Tak Industrial Building Block 2 71.64 79 Kwai Shun Street Playground 76.38 80 Profit Industrial Building 70.64 81 Kwai Shun Industrial Centre 71.19 82 Lai King Catholic Secondary School 69.85 83 Lai King Estate Fung King House 77.46 84 Supermarket at G/F of the Panorama 67.44 85 Shop at G/F of Skyline Plaza 68.23 86 Shopping Centre of Vision City 69.14 87 Allway Gardens Shopping Arcade 63.25 88 Shopping Centre of Waterside Plaza 65.92 89 Riviera Gardens Tower 22 – G/F 65.62

Notes: 1) All pollutant concentrations include the background concentration ([RSP] = 56.4 μg/m3).

Table 4-14 Predicted Cumulative Worst Case Average RSP Concentrations at Planned ASRs

ASR No. Description RSP (μg/m3)

Planned ASRs Daily 17 Development at TW5 Bayside Tower 1 65.28 18 Development at TW5 Bayside Tower 2 65.00 19 Development at TW5 Bayside Tower 3 64.44 20 Development at TW5 Bayside Tower 4 64.95 21 Development at TW5 Bayside Tower 5 65.74 22 Development at TW5 Bayside Tower 6 68.82 23 Development at TW5 Bayside Tower 7 69.70 24 Development at TW5 Bayside Tower 8 69.51 25 Development at TW5 Bayside Tower 9 69.42

Final EIA Report 4-28 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

RSP (μg/m3) ASR No. Description

Planned ASRs Daily 26 Development at TW5 Cityside Tower 10 67.20 27 Development at TW5 Cityside Tower 11 65.94 32 Tsuen Wan Town Lot 394 Tower 1 66.53 33 Tsuen Wan Town Lot 394 Tower 2 66.84 34 Tsuen Wan Town Lot 393 69.92 37 66.75 38

Development at TW6 Tower 1 66.70

39 66.45 40

Development at TW6 Tower 2 66.35

42 70.77 43

Development at TW7 Tower 1 70.84

44 70.88 45

Development at TW7 Tower 2 70.21

46 69.77 47

Development at TW7 Tower 3 69.63

48 69.70 49

Development at TW7 Tower 4 68.85

50 68.64 51

Development at TW7 Tower 5 67.99

52 70.11 53

Development at TW7 Tower 6 70.03

54 70.04 55

Development at TW7 Tower 7 69.69

61 Proposed School Site at TW7 65.56 Notes: 1) All pollutant concentrations include the background concentration ([RSP] = 56.4 μg/m3).

4.6.5 In Table 4-11 and Table 4-12, the simulated results at ASRs show that the nighttime

NO2 concentrations are higher than the concentrations during daytime. Thus, nighttime condition was considered as the worst-case condition and the hourly averaged result during nighttime was used to calculate the daily concentration.

4.6.6 Referring to the results shown in Table 4-11 to Table 4-14, it can be noted that the concentration of all predicted air quality parameters (1-hour NO2, 24-hour NO2 and 24-hour RSP) at all the representative ASRs would comply with the AQO limits under worse-case scenario. All existing and proposed noise mitigation for this Project such as vertical noise barriers, cantilever noise barriers, semi-enclosures and full noise enclosures have been adopted in this air quality impact assessment. Appendix 4-S and Appendix 4-T presents the input/output files of CALINE4 and ISCST3 models.

Final EIA Report 4-29 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

4.6.7 For ease of visualisation, contour plots of hourly and daily average concentrations of NO2 at worst hit concentration level (1.5m above ground) are presented in Figures 4-5 and 4-6. Contours for daily average concentrations of RSP at worst hit concentration level (1.5m above ground) are plotted in Figure 4-7. As illustrated in Figures 4-5, 4-6 and 4-7, there is no ASR within the contours of exceeding air quality criteria.

Air Quality inside Full Enclosures 4.6.8 Air quality inside the sections of full enclosures during normal traffic condition and

congested traffic condition was assessed. Results are presented in Table 4-15.

Table 4-15 Predicted Maximum NO2 Concentrations inside Full Noise Enclosures

Maximum NO2 Concentration (μg/m3) Full Enclosure No. (1)

Normal Traffic Condition Congested Traffic Condition

F1 404 611

F2 329 444

F3 310 491 Note: 1) Full enclosure numbers are shown in Figure A4-M1 in Appendix 4M.

4.6.9 Table 4-15 indicates that the maximum NO2 concentration inside all full noise

enclosures under both normal and congested traffic conditions is well below the recommended level of 1,800 μg/m3 specified on the guideline. Therefore, it is anticipated that no adverse air quality impact inside all full noise enclosures associated with the on-road traffic would be resulted.

4.7 Recommendations for Monitoring and Audit

4.7.1 With the implementation of the proposed dust suppression measures, good site practices and dust monitoring and audit programme, no adverse dust impact would be expected at the ASRs. Details of the monitoring requirements such as monitoring locations, frequency of baseline and impact monitoring are presented in the EM&A manual separate for this report.

4.8 Conclusions

4.8.1 As construction works are controlled under the Air Pollution Control (Construction Dust) Regulations, it is mandatory that the construction works are implemented in accordance with the legislative requirements and hence the potential for causing dust nuisance is kept to a minimum level. Monitoring and audit requirements would recommend in order to ensure that the air quality level is in compliance with the statutory requirements.

4.8.2 Typical construction works and the major dust generating activities have been identified and reviewed. Good site work practices based on the statutory requirements laid down in the Air Pollution Control (Construction Dust) Regulations should be conveyed to site staff to ensure effective implementation of dust control measures during the construction phase. Provided these recommendations are followed, it is

Final EIA Report 4-30 04.Air Quality Impact (20080922)

Agreement No. CE 69/2001 (HY) Tsuen Wan Bypass, Widening of Tsuen Wan Road between Tsuen Tsing Interchange and Kwai Tsing Interchange and Associated Junction Improvement Works Environmental Impact Assessment

Scott Wilson Ltd October 2008

anticipated that there should be no adverse air quality impact during the construction to the adjacent ASRs along the project area.

4.8.3 Total air quality level associated with the operational phase, which is contributed mainly by vehicular gaseous emission, portal emission from full noise enclosures and chimney emission from industrial premises has been assessed, with the consideration of background air quality level. Existing and proposed noise mitigation measures for this Project have been taken into account in this air quality impact assessment.

4.8.4 Results indicate that the predicted maximum hourly and daily concentrations of NO2 shall comply with the corresponding AQO hourly and daily limits of 300 µg/m3 and 150 µg/m3 respectively at all ASRs. On the other hand, results of the predicted maximum daily RSP concentration is well below the AQO limit of 180 µg/m3. In other words, it is anticipated that no potential air quality impact to the ASRs will be resulted associated with the operation phase of this Project, and no mitigation measures for air quality impact during operational phase would be deemed necessary.

Final EIA Report 4-31 04.Air Quality Impact (20080922)