Agreement No. CE 42/2005(WS)

Laying of Western Cross Harbour Main and Associated Land Mains from West Kowloon to Sai Ying Pun – Investigation

Environmental Impact Assessment Report

Document No. 226133/09/D

April 2007

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Mott Connell Ltd

40th floor, Hopewell Centre

183 Queen’s Road East

Wanchai

Hong Kong

 

Tel: 2828 5757

 

Fax: 2827 1823

 

 

 


List of Contents                                                                                               

Chapters

1          INTRODUCTION   1-1

1.1        Background  1-1

1.2        The Environmental Impact Assessment Study  1-1

1.3        The Project Area  1-3

1.4        Environmental Impact Assessment Ordinance  1-3

1.5        Documents Reviewed  1-5

2          CONSIDERATION OF ALTERNATIVES  2-1

2.1        Need for the Project 2-1

2.2        Tentative Construction Programme  2-1

2.3        Consideration of Alternative Alignment Options  2-1

2.3.1    Physical Constraints to the Alignment 2-1

2.3.2    Routing Constraints of the Alignment 2-2

2.4        Consideration of Alternative Construction Methods and Works Sequences  2-2

2.4.1    Trench Excavation  2-2

2.4.2    Submarine Pipeline Installation  2-3

2.4.3    Backfilling  2-3

2.4.4    Horizontal Directional Drilling  2-4

2.4.5    Best Practical Method  2-6

2.4.6    Sequencing and Timing  2-6

2.5        Selection of the Preferred Option  2-6

3          WATER QUALITY IMPACT ASSESSMENT   3-1

3.1        Introduction  3-1

3.2        Environmental Legislation, Standards, Guidelines and Criteria  3-1

3.2.1    Environmental Impact Assessment Ordinance (EIAO) 3-1

3.2.2    Water Quality Objectives (WQOs) 3-1

3.2.3    Technical Memorandum   3-4

3.2.4    Hong Kong Planning Standards and Guidelines (HKPSG) 3-5

3.2.5    Water Supplies Department (WSD) Water Quality Criteria  3-5

3.2.6    Practice Note  3-5

3.2.7    Suspended Solids Criterion for Fish Culture Zone  3-5

3.2.8    Suspended Solids Criterion for Benthic Organisms  3-6

3.2.9    Sediment Quality  3-6

3.3        Description of the Environment 3-6

3.3.1    Marine Water Quality Monitored by EPD   3-6

3.3.2    Sediment Quality  3-9

3.3.3    Trend of Water Quality in Victoria Harbour 3-9

3.4        Water Sensitive Receivers  3-9

3.5        Assessment Methodology  3-11

3.5.1    Hydrodynamic and Water Quality Models  3-11

3.5.2    Sediment Plume Modelling  3-12

3.5.3    Effluent, Sewage and Surface runoff 3-16

3.6        Identification of Environmental Impact 3-16

3.6.1    Construction Phase  3-16

3.6.2    Operation Phase  3-19

3.7        Prediction and Evaluation of Environmental Impacts  3-20

3.7.1    Suspended Solids  3-20

3.7.2    Dissolved Oxygen, Total Inorganic Nitrogen and Unionised Ammonia  3-23

3.7.3    Potential Contaminant Release During Dredging  3-29

3.7.4    Hydrostatic Tests of the Water Mains System   3-31

3.7.5    Surface Runoff, Sewage and Wastewater from Construction Activities  3-31

3.8        Mitigation of Adverse Environmental Impact 3-32

3.8.1    Construction Phase  3-32

3.9        Evaluation of Residual Impacts  3-35

3.10      Environmental Monitoring and Audit 3-35

3.11      Conclusions and Recommendations  3-36

3.11.1   Construction Phase  3-36

3.11.2   Operation Phase  3-36

4          MARINE ECOLOGICAL IMPACT ASSESSMENT   4-1

4.1        Introduction  4-1

4.2        Environmental Legislation, Standards, Guidelines and Criteria  4-1

4.3        Assessment Methodology  4-3

4.4        Baseline Conditions & Marine Ecological Sensitive Receivers  4-4

4.4.1    Existing Condition of Victoria Harbour 4-4

4.5        Ecological Importance  4-12

4.6        Identification and Prediction of Environmental Impacts  4-14

4.6.1    Construction Phase  4-14

4.6.2    Operational Phase  4-15

4.7        Evaluation of Environmental Impacts  4-15

4.7.1    Construction Phase  4-15

4.8        Mitigation of Adverse Environmental Impact 4-17

4.9        Evaluation of Residual Impacts  4-18

4.10      Environmental Monitoring and Audit 4-18

4.11      Conclusions and Recommendations  4-18

5          NOISE IMPACT ASSESSMENT   5-1

5.1        Introduction  5-1

5.2        Environmental Legislation, Standards, Guidelines and Criteria  5-1

5.2.1    Construction Noise  5-1

5.2.2    Area Sensitivity Ratings  5-2

5.3        Noise Sensitive Receivers  5-3

5.4        Assessment Methodology  5-4

5.4.1    Guidelines in GW-TM   5-4

5.4.2    Area Sensitive Ratings (ASRs) 5-5

5.4.3    Assessment for the Project 5-5

5.5        Identification, Prediction and Evaluation of Environmental Impacts  5-6

5.5.1    Construction Phase  5-6

5.5.2    Representative NSRs  5-8

5.5.3    Evaluation of Noise Impact 5-9

5.6        Mitigation of Adverse Environmental Impacts  5-10

5.6.1    Work Schedule Rearrangement 5-10

5.6.2    Using Quality PME  5-11

5.6.3    Using Noise Barriers  5-11

5.6.4    Good Site Practice  5-11

5.7        Evaluation of Residual Impacts  5-11

5.8        Environmental Monitoring and Audit 5-11

5.9        Conclusions and Recommendations  5-12

6          WASTE IMPACT ASSESSMENT   6-1

6.1        Introduction  6-1

6.2        Environmental Legislation, Standards, Guidelines and Criteria  6-1

6.2.1    General 6-1

6.2.2    Waste Management 6-1

6.2.3    Construction and Demolition (C&D) Materials  6-2

6.2.4    Marine Dredged Sediment 6-2

6.3        Assessment Methodology  6-3

6.3.1    General 6-3

6.3.2    Marine Site Investigation  6-3

6.3.3    Marine Dredged Sediment 6-4

6.4        Baseline Condition of Marine Dredged Sediment 6-10

6.4.1    Chemical Screening  6-10

6.4.2    Biological Screening  6-15

6.5        Identification and Evaluation of Environmental Impacts  6-15

6.5.1    Construction Phase  6-15

6.5.2    Operation Phase  6-17

6.6        Mitigation of Adverse Environmental Impacts  6-18

6.6.1    Good Site Practices  6-18

6.6.2    Waste Reduction Measures  6-18

6.6.3    C&D Material 6-18

6.6.4    General Refuse  6-19

6.6.5    Chemical Waste  6-19

6.6.6    Marine Dredged Sediment 6-19

6.7        Evaluation of Residual Impacts  6-22

6.8        Environmental Monitoring and Audit 6-22

6.9        Conclusions and Recommendations  6-22

7          AIR QUALITY IMPACT ASSESSMENT   7-1

7.1        Introduction  7-1

7.2        Environmental Legislation, Standards, Guidelines and Criteria  7-1

7.2.1    Hong Kong Air Pollution Control Ordinance  7-1

7.2.2    Air Pollution Control (Construction Dust) Regulation  7-2

7.2.3    Technical Memorandum on EIA Process (EIAO-TM), Annex 4 and 12  7-2

7.3        Baseline Conditions & Air Sensitive Receivers  7-2

7.3.1    Baseline Conditions  7-2

7.3.2    Air Sensitive Receivers  7-3

7.4        Identification and Evaluation of Air Quality Impacts  7-4

7.4.1    Construction Phase  7-4

7.4.2    Operation Phase  7-4

7.5        Mitigation of Adverse Environmental Impacts  7-4

7.5.1    Construction Phase  7-4

7.5.2    Operation Phase  7-5

7.6        Evaluation of Residual Air Quality Impacts  7-5

7.7        Environmental Monitoring and Audit 7-5

7.8        Conclusions and Recommendations  7-6

8          CULTURAL HERITAGE IMPACT ASSESSMENT   8-1

8.1        Introduction  8-1

8.2        Environmental Legislation, Standards, Guidelines and Criteria  8-1

8.2.1    Technical Memorandum on the EIA Process, Annex 10 and 19  8-1

8.2.2    Antiquities and Monuments Ordinance (Cap.53) 8-2

8.2.3    Hong Kong Planning Standards and Guidelines  8-3

8.2.4    Marine Archaeological Guidelines  8-3

8.3        Cultural Heritage Impact Assessment Methodology  8-3

8.3.1    Baseline Review   8-3

8.3.2    Geophysical Survey  8-3

8.3.3    Establishing Archaeological Potential 8-3

8.4        Baseline Conditions  8-4

8.5        Identification of Cultural Heritage Impact 8-4

8.6        Assessment of Cultural Heritage Impact 8-4

8.7        Mitigation of Adverse Environmental Impact 8-5

8.8        Evaluation of Residual Cultural Heritage Impact 8-5

8.9        Environmental Monitoring and Audit 8-5

8.10      Conclusions and Recommendations  8-5

9          FISHERIES IMPACT ASSESSMENT   9-1

9.1        Introduction  9-1

9.2        Environmental Legislation, Standards, Guidelines and Criteria  9-1

9.3        Fisheries Impact Assessment Methodology  9-1

9.4        Baseline Conditions  9-2

9.4.1    Capture Fisheries  9-2

9.4.2    Culture Fisheries  9-5

9.4.3    Fisheries Importance  9-6

9.4.4    Sensitive Receivers  9-6

9.5        Identification of Fisheries Impacts  9-6

9.5.1    Construction Phase  9-6

9.5.2    Operation Phase  9-8

9.6        Assessment of Fisheries Impacts  9-9

9.7        Mitigation of Adverse Environmental Impacts  9-9

9.8        Evaluation of Residual Fisheries Impacts  9-10

9.9        Environmental Monitoring & Audit 9-10

9.10      Conclusions and Recommendations  9-10

10        SUMMARY OF ENVIRONMENTAL OUTCOMES  10-1

10.1      Population and Environmental Sensitive Areas Protected  10-1

10.2      Environmental Friendly Designs Recommended and Problems Avoided  10-1

10.3      Environmental Benefits of the Project 10-1

11        ENVIRONMENTAL MONITORING AND AUDIT (EM&A) REQUIREMENTS  11-1

11.1      Water Quality  11-1

11.2      Marine Ecology  11-1

11.3      Noise  11-1

11.4      Waste Management 11-1

11.5      Air Quality  11-2

11.6      Cultural Heritage  11-2

11.7      Fisheries  11-2

12        CONCLUSIONS AND RECOMMENDATIONS  12-1

12.1      Water Quality  12-1

12.1.1   Construction Phase  12-1

12.1.2   Operation Phase  12-1

12.2      Marine Ecology  12-1

12.3      Noise  12-2

12.4      Waste  12-2

12.5      Air Quality  12-3

12.6      Cultural Heritage  12-3

12.7      Fisheries  12-3

13        IMPLEMENTATION SCHEDULE   13-1

 

List of Tables

Table 3‑1.... Summary of Water Quality Objectives for the Victoria Harbour WCZ. 3-2

Table 3‑2.... Summary of Water Quality Objectives for the Western Buffer WCZ. 3-3

Table 3‑3.... WSD’s Water Quality Criteria for Flushing Water at Sea Water Intakes. 3-5

Table 3‑4.... Marine Water Quality in Phases Two and Three of the Victoria Harbour Water Control Zone at Selected Stations in 2005. 3-7

Table 3‑5.... Water Quality Indicator Points. 3-10

Table 3‑6.... Summary of Parameters for Sediment Plume Model (Delft3D-WAQ) 3-12

Table 3‑7.... Sediment Quality near the Dredging Area. 3-13

Table 3‑8.... Specifications for General Fill Material and Granular Fill Material 3-14

Table 3‑9.... Depth-averaged and Surface SS levels near the Dredging Area. 3-18

Table 3‑10.. DO, TIN and NH3-N levels near the Dredging Area. 3-18

Table 3‑11.. Predicted Suspended Solids Elevations at Marine Ecology Sensitive Receivers. 3-21

Table 3‑12.. Predicted Suspended Solids Concentrations at Marine Ecology Sensitive Receivers. 3-21

Table 3‑13.. Predicted Suspended Solids Elevations at Cooling and Sea Water Intakes. 3-22

Table 3‑14.. Predicted Suspended Solids Concentrations at Cooling and Sea Water Intakes. 3-23

Table 3‑15.. Predicted Dissolved Oxygen, Total Inorganic Nitrogen and Unionised Ammonia Elevations. 3-25

Table 3‑16.. Predicted Dissolved Oxygen, Total Inorganic Nitrogen and Unionised Ammonia Concentrations  3-27

Table 3‑17.. Comparison of Marine Sediment Elutriate Test Results with Water Quality Standards. 3-30

Table 4‑1.... Typical Members of the Macrofauling Community in Wharf Piles of Hong Kong (Source: Morton, B. and Morton, J. 1983) 4-5

Table 4‑2.... Abstract of Coastal Flora and Fauna recorded in Green Island, Little Green Island and a reference site in Hong Kong Island. (Source: ERM, 1998) 4-7

Table 4‑3.... Benthic Epifauna Recorded around Green Island (Source: ERM, 1995) 4-9

Table 4‑4.... Frequency of Soft Coral and Gorgonian Colonies Recorded around Green Island (Source: ERM, 1998) 4-11

Table 4‑5.... Evaluation of the Ecological Importance of the Inter-tidal Habitats. 4-13

Table 4‑6.... Evaluation of the Ecological Importance of the Sub-tidal Habitats. 4-13

Table 4‑7.... Evaluation of the Significance of Ecological Impact 4-16

Table 5‑1.... EIAO-TM Daytime Construction Noise Standards (0700 to 1900 hours on any day not being a Sunday or public holiday) (Leq.30 min dB(A)) 5-2

Table 5‑2.... Basic Noise Levels (BNL, Leq.30 min dB(A)) 5-2

Table 5‑3.... Representative Noise Sensitive Receivers. 5-4

Table 5‑4.... Noise Emission Inventory (Sai Ying Pun) 5-7

Table 5‑5.... Noise Emission Inventory (West Kowloon) 5-8

Table 5‑6.... Selected NSRs for Noise Assessment 5-9

Table 5‑7.... Summary of Unmitigated Construction Noise Levels during Normal Daytime Working Hours  5-9

Table 5‑8.... Summary of Unmitigated Construction Noise Levels from dredging during Restricted Hours  5-9

Table 5‑9.... Summary of Mitigated Construction Noise Levels from dredging during Night time (2300 to 0700 hours) 5-11

Table 6‑1.... Coordinates, Type and Depth of Vibrocores. 6-4

Table 6‑2.... Sample Arrangement for Chemical Testing. 6-5

Table 6‑3.... Testing Methods and Reporting Limits for Metals and Metalloids Analysis. 6-7

Table 6‑4.... Testing Methods and Reporting Limits for TBT, PAHs and PCBs Analysis. 6-7

Table 6‑5.... Sediment Quality Criteria for the Classification of Sediment 6-7

Table 6‑6.... Composite Sample Arrangement for Biological Testing. 6-9

Table 6‑7.... Test Species for Biological Testing. 6-9

Table 6‑8.... Test endpoints and decision criteria for biological testing. 6-10

Table 6‑9.... Contaminant Levels of Vibrocore Samples and Their Categories. 6-11

Table 6‑10.. Summary of Classification of Vibrocore Samples. 6-15

Table 6‑11.. Summary of Ancillary Tests Results. 6-15

Table 6‑12.. Summary of Toxicity Test Failure. 6-15

Table 6‑13.. Summary of Waste Handling Procedures and Disposal Routes. 6-21

Table 7‑1.... Hong Kong Air Quality Objectives (mg/m3)(i) 7-1

Table 7‑2.... Background Air Quality (2001 – 2005) 7-3

Table 7‑3.... Representative Air Sensitive Receivers. 7-3

Table 9‑1.... Area (ha) and Number of Vessels Operating During 1996 - 1997 in Each AFCD Fishing Zone within the Study Area. 9-3

Table 9‑2.... Fisheries Production Values from each AFCD Fishing Zone within the Study Area. 9-4

Table 9‑3.... Top Five Adult Fish (by weight) Caught in Each AFCD Fishing Zone within the waters of the Study Area  9-4

List of Figures

Figure 1.1    Indicative Route of the Proposed Watermains

Figure 2.1    Physical Constraints to the Proposed Submarine Watermain

Figure 2.2    Selected Route of Proposed Submarine Watermain

Figure 2.3    Plan View, Profile and Cross Section of Proposed Submarine Watermain

Figure 2.4    Bottom Pull Method

Figure 2.5    Lay Barge Method

Figure 2.6    Float and Sink Method

Figure 2.7    Horizontal Directional Drilling (HDD) Method

Figure 3.1    Locations of EPD’s Marine Water Quality Monitoring Stations in Victoria Harbour and Western Buffer Water Control Zones

Figure 3.2    Locations of Water Sensitive Receivers and Stormwater Outfalls at Western Harbour

Figure 3.3    Extent of the Western Harbour Model Grid

Figure 3.4    Details of the Western Harbour Model Grid in the Project Area

Figure 3.5    Resolution of the Western Harbour Model Grid

Figure 3.6    Grid Refinement of the Western Harbour Model Grid

Figure 3.7a   Coastline Configuration in the Project Area

Figure 3.7b   Coastline Configuration in the Victoria Harbour

Figure 3.7c   Coastline Configuration in the vicinity of the Alignment

Figure 3.8a   Bathymetry in the Project Area

Figure 3.8b   Bathymetry in the Victoria Harbour

Figure 3.8c   Bathymetry in the vicinity of the Alignment

Figure 3.9    Typical Configuration of Silt Curtain and Silt Screen

Figure 4.1    Study Area and Sampling Locations for Marine Ecological Impact Assessment

Figure 4.2    Intertidal Habitats within the Study Area

Figure 5.1    Locations of Noise Sensitive Receivers in Sai Ying Pun

Figure 5.2    Locations of Noise Sensitive Receivers in West Kowloon

Figure 5.3    Works Area – Sai Ying Pun

Figure 5.4    Works Area – West Kowloon

Figure 5.5    Location of Night-time Dredging Zone

Figure 6.1    Longitudinal Geological Profile of Proposed Submarine Watermain Alignment

Figure 6.2    Locations of Vibrocores

Figure 6.3    Sediment Classification Plan

Figure 7.1    Locations of Air Quality Sensitive Receivers in Sai Ying Pun

Figure 8.1    Geophysical Survey Area and Seabed Features with Side Scan Sonar Track

Figure 9.1    Location of AFCD Fishing Zones in the vicinity of the Proposed Watermains

Figure 9.2    Fishing Grids within the Study Area

List of Appendices

Appendix A      EIA Study Brief No. ESB-132/2005

Appendix B      Tentative Project Programme

Appendix C1     Water Quality Modelling Results

Appendix C2     Laboratory Test Report on Elutriate Tests

Appendix D      Not Used

Appendix E       Detailed Calculations of Construction Noise Levels

Appendix F1     Vibrocore Records

Appendix F2     Laboratory Test Report on Chemical Screening

Appendix F3     Laboratory Test Report on Biological Screening

Appendix F4     Approval Letter from MFC on Dredging Rationale

Appendix G      Not Used

Appendix H      Marine Archaeological Investigation Report

 

 


1                        INTRODUCTION

1.1                   Background

In February 2006, Mott Connell Limited (MCL) was commissioned by Water Supplies Department under Agreement No. CE 42/2005(WS) to carry out the investigation and preliminary design for the “Laying of Western Cross Harbour Main and Associated Land Mains from West Kowloon to Sai Ying Pun” (The Project).

The need for the project has evolved from the requirement to provide security of water supply between Hong Kong and Kowloon. Specifically, it has been determined that 10 years’ time, two of the existing four cross-harbour pipelines transferring portable supplies to Hong Kong Island will reach their design life of 50 years. There will be increasing risk of having one cross-harbour pipeline under maintenance while another pipeline has to be taken out of service without warning.

As cross-harbour pipelines are strategically important, it is necessary to lay a new cross-harbour pipeline on the western part of the harbour for maintaining the reliability of cross-harbour water transfer to Hong Kong Island.

The primary objective of this Assignment is to study the feasibility of providing laying of this additional submarine watermain and associated land mains. The Project and the Environmental Impact Assessment (EIA) is charged with identifying alternative sites and alignments if necessary as part of the EIA study for the Project, and obtaining an Environmental Permit (EP). This Assignment requires preliminary designs, contract strategy, programmes and cost estimates to be prepared to enable the detailed design to proceed. This Environmental Impact Assessment (EIA) Report is a key milestone of the Assignment and has been prepared in conjunction with other design teams.

The route of the proposed watermains is shown in Figure 1.1. The proposed Project is to construct and operate a new western cross harbour main and associated land mains.

The scope of the proposed Project comprises the following:

(i)       approximately 2100-metre section of 1200mm nominal diameter of submarine watermain across Victoria Harbour from its connection at Lin Cheung Road in West Kowloon to the existing Sai Ying Pun Fresh Water Pumping Station in Sheung Wan (a designated project under EIA Ordinance);

(ii)           approximately 2200-metre section of 1200mm nominal diameter of associated land watermains (Not a designated project under EIA Ordinance).

1.2                   The Environmental Impact Assessment Study

The submarine watermain component (referred in Section 1.1(i) above) of the Project is a Designated Project under Schedule 2, Part 1(E3) of the Environmental Impact Assessment Ordinance (EIAO) (Cap. 499) and an Environmental Permit (EP) issued under the EIAO is required for the construction and operation of the designated project. An application (No. ESB-132/2005) for a EIA study brief under section 5(7)(a) of the EIAO was submitted by Water Supplies Department on 30 August 2005 with a project profile No. PP-258/2005 (the Project Profile). The EPD issued an EIA Study Brief No. ESB-132/2005 on 13 October 2005, detailing the requirements for carrying out and reporting the EIA study.

The purpose of the EIA study is to provide information on the nature and extent of environmental impacts arising from the construction of the proposed designated project and related activities taking place concurrently, ultimately providing information on the following:

(i)      the overall acceptability of any adverse environmental consequences that are likely to arise as a result of the proposed project;

(ii)      the conditions and requirements for the detailed design, construction and operation of the proposed project to mitigate against adverse environmental consequences wherever practicable; and

(iii)     the acceptability of residual impacts after the proposed mitigation measures are implemented.

The scope of the EIA covers the Project proposed in the Project Profile and the works and facilities mentioned in Section 1.1 above.  The EIA study addresses the key issues described below, together with any other key issues identified during the course of the EIA study and the cumulative environmental impacts of the Project, through interaction or in combination with other existing, committed, and planned and known potential developments in the vicinity of the Project:

(i)      the potential water quality and marine ecology impacts arising from the dredging, laying of pipe and backfilling works for the construction of the submarine watermain.

(ii)     the potential noise and dust impacts arising from the construction works of the Project.

(iii)    the potential impacts on sites of cultural heritage of marine archaeological deposit likely to be affected by the construction works of the Project.

(iv)    the potential fisheries impact arising from the Project.

The EIA study addressed all environmental aspects of the activities and has been based on the best and latest information available during the course of the EIA study.  The cumulative environmental impacts from the Project with other interacting projects were assessed, including details of the construction programme and methodologies.

Previously approved studies or EIA reports which are relevant to the Project were reviewed and relevant information extracted for the purpose of this EIA study.  The following study or EIA report has been referred to:

·         Proposed Submarine Gas Pipelines from Cheng Tou Jiao Liquefied Natural Gas Production Plant, Hong Kong

1.3                   The Project Area

The proposed Project covers three main areas, namely: Victoria Harbour, West Kowloon and Sai Ying Pun.

The works for Victoria Harbour (a designated project under EIA Ordinance) is envisaged to comprise an approximately 50m wide corridor across Victoria Harbour linking West Kowloon with Sai Ying Pun.

The works in West Kowloon (Not a designated project under EIA Ordinance) generally comprise the West Kowloon Reclamation Area adjacent to the Western Harbour Tunnel Toll Plaza, and are bounded by Jordan Road to its north and Lin Cheung Road to its east. The land uses in this portion include the land reserved for the West Kowloon Cultural District, the Kowloon Station Development, the Wui Cheung Road Bus Terminus, the Yau Ma Tei Public Cargo Working Area, and the Western Harbour Tunnel Toll Plaza.  The proposed 1200mm diameter fresh watermain will be laid in this portion for connection to the existing 1200mm diameter fresh watermain at the junction of Lin Cheung Road or Wui Cheung Road.

In Sai Ying Pun (Not a designated project under EIA Ordinance), the works comprise Sai Ying Pun area adjacent to Western Wholesale Food Market and is bounded by the approaches of Western Harbour Crossing Interchange.  The proposed 1200mm diameter fresh watermain will be laid in this portion for connection to the existing Sai Ying Pun Fresh Water Pumping Station situated at the junction of Water Street/Fung Mat Road.

This EIA report covers the designated project component of the Project.

1.4                   Environmental Impact Assessment Ordinance

As detailed in Section 1.2, the proposed submarine watermain is a Designated Project under Schedule 2, Part1(E3) of the EIAO (Cap. 499) and an EP issued under the EIAO is required for the construction and operation of the designated project.

To apply for an EP, an EIA must be undertaken in accordance with the requirements of the Study Brief issued by EPD on 13 October 2005, under reference No. ESB-132/2005. Reference can be made to the full requirements of the Study Brief which is contained in Appendix A. 

The EIA has been conducted in accordance with the Study Brief, the Project Profile (No. PP-258/2005) and the criteria in the relevant sections of the Technical Memorandum on the EIA Process (Environmental Impact Assessment Ordinance) (EIAO-TM). The EIA has identified, described, predicted and evaluated potential environmental impacts, mitigation measures and will consider the impacts of any feasible alternatives.

The EIA Study assessed and discussed the alternative alignments and landing points of the proposed submarine watermain, alternative construction methods and sequences, and to compare their environmental benefits and dis-benefits with the view of selecting the preferred options from the environmental perspective.

The objectives of the EIA Study as detailed in the EIA Study Brief are as follows:

(i)         to describe the Project and associated works together with the requirements for carrying out the Project;

(ii)        to identify if there are other types of Designated Projects under Part I Schedule 2 of the EIAO to be covered in the Project;

(iii)       to consider alternative alignment(s) and landing points of the submarine watermain, alternative construction method(s) and sequence(s), and to compare their environmental benefits and dis-benefits with the view of selecting the preferred options from the environmental perspective;

(iv)       to identify and describe the elements of the community and environment likely to be affected by the proposed project and/or likely to cause adverse impacts to the proposed project, including both the natural and man-made environment;

(v)        to identify and quantify emission sources and determine the significance of impacts on sensitive receivers and potential affected uses;

(vi)       to identify and quantify any potential losses or damage to flora, fauna and natural habitats and to propose measures to mitigate these impacts;

(vii)      to identify any negative impacts on fisheries and to propose measures to mitigate these impacts;