1 WATER QUALITY

Agreement No. CE 11/2002 (DS)

Drainage Improvement in Sai Kung – Design and Construction

Final Environmental Impact Assessment Report (Volume 1)

TABLE OF CONTENTS

1 INTRODUCTION................................................................................................................ 1-1

1.1 Background to the Study............................................................................................... 1-1

1.2 Purpose and Scope of the EIA...................................................................................... 1-2

1.3 EIA Study Area........................................................................................................... 1-4

1.4 Structure of the Report................................................................................................. 1-5

2 Description of the Project.................................................................................. 2-1

2.1 Project Details and Design Considerations..................................................................... 2-1

2.2 The Need for the Project.............................................................................................. 2-4

2.3 Continuous Public Involvement (CPI)............................................................................ 2-7

2.4 Alternative Drainage Options........................................................................................ 2-9

2.5 Preliminary Design of Drainage Improvement Works.................................................... 2-16

2.6 Construction Methods and Engineering Requirements................................................... 2-19

2.7 Operation of the Project.............................................................................................. 2-24

2.8 Scenario Without the Project....................................................................................... 2-24

2.9 Works Programme..................................................................................................... 2-24

2.10 Interaction with Other Projects.................................................................................... 2-24

3 CONSTRUCTION AIR QUALITY IMPACT..................................................................... 3-1

3.1 Introduction.................................................................................................................. 3-1

3.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 3-1

3.3 Description of the Environment..................................................................................... 3-2

3.4 Air Sensitive Receivers................................................................................................. 3-2

3.5 Identification of Environmental Impacts......................................................................... 3-3

3.6 Assessment Methodology & Criteria............................................................................. 3-4

3.7 Prediction and Evaluation of Impacts............................................................................. 3-5

3.8 Mitigation Measures..................................................................................................... 3-7

3.9 Cumulative Impacts with Other Concurrent Projects....................................................... 3-9

3.10 Residual Environmental Impact.................................................................................... 3-11

3.11 Environmental Monitoring and Audit Requirements....................................................... 3-11

3.12 Conclusions................................................................................................................ 3-11

4 CONSTRUCTION NOISE IMPACT.................................................................................. 4-1

4.1 Introduction.................................................................................................................. 4-1

4.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 4-1

4.3 Description of the Environment..................................................................................... 4-2

4.4 Noise Sensitive Receivers............................................................................................. 4-3

4.5 Assessment Methodology & Criteria............................................................................. 4-4

4.6 Identification of Environmental Impacts......................................................................... 4-5

4.7 Prediction and Evaluation of Impacts............................................................................. 4-6

4.8 Mitigation Measures..................................................................................................... 4-7

4.9 Residual Environmental Impact.................................................................................... 4-12

4.10 Environmental Monitoring and Audit Requirements....................................................... 4-12

4.11 Conclusions................................................................................................................ 4-12

5 WATER QUALITY IMPACT.............................................................................................. 5-1

5.1 Introduction.................................................................................................................. 5-1

5.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 5-1

5.3 Description of the Environment..................................................................................... 5-3

5.4 Water Sensitive Receivers.......................................................................................... 5-13

5.5 Assessment Methodology & Criteria............................................................................ 5-14

5.6 Identification of Environmental Impacts........................................................................ 5-14

5.7 Prediction and Evaluation of Impacts........................................................................... 5-16

5.8 Mitigation Measures................................................................................................... 5-18

5.9 Residual Environmental Impact.................................................................................... 5-21

5.10 Environmental Monitoring and Audit Requirements....................................................... 5-21

5.11 Conclusions................................................................................................................ 5-21

6 WASTE MANAGEMENT IMPLICATIONS...................................................................... 6-1

6.1 Introduction.................................................................................................................. 6-1

6.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 6-1

6.3 Assessment Methodology............................................................................................. 6-2

6.4 Identification of Evaluation of Environmental Impacts..................................................... 6-5

6.5 Mitigation Measures..................................................................................................... 6-8

6.6 Residual Environmental Impact.................................................................................... 6-10

6.7 Environmental Monitoring and Audit Requirements....................................................... 6-10

6.8 Conclusions................................................................................................................ 6-11

7 LAND CONTAMINATION................................................................................................. 7-1

7.1 Introduction.................................................................................................................. 7-1

7.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 7-1

7.3 Assessment Methodology & Criteria............................................................................. 7-1

7.4 Description of the Environment..................................................................................... 7-2

7.5 Identification of Environmental Impacts......................................................................... 7-5

7.6 Site Investigation for Land Contamination...................................................................... 7-6

7.7 Prediction and Evaluation of Impacts............................................................................. 7-7

7.8 Residual Environmental Impact.................................................................................... 7-10

7.9 Mitigation Measures during Construction Stage............................................................. 7-10

7.10 Environmental Monitoring and Audit Requirements....................................................... 7-11

7.11 Conclusions................................................................................................................ 7-11

8 ECOLOGICAL IMPACT.................................................................................................... 8-1

8.1 Introduction.................................................................................................................. 8-1

8.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 8-1

8.3 Assessment Methodology & Criteria............................................................................. 8-2

8.4 Description of the Environment..................................................................................... 8-4

8.5 Ecological Value......................................................................................................... 8-12

8.6 Identification of Environmental Impacts........................................................................ 8-17

8.7 Prediction and Evaluation of Impacts........................................................................... 8-18

8.8 Mitigation Measures................................................................................................... 8-32

8.9 Residual Environmental Impact.................................................................................... 8-35

8.10 Environmental Monitoring and Audit Requirements....................................................... 8-36

8.11 Conclusions................................................................................................................ 8-37

9 LANDSCAPE AND VISUAL IMPACT............................................................................... 9-1

9.1 Introduction.................................................................................................................. 9-1

9.2 Scope and Content of Study.......................................................................................... 9-1

9.3 Purpose of LVIA......................................................................................................... 9-1

9.4 Environmental Legislation, Policies, Plans, Standards and Criteria.................................... 9-2

9.5 Assessment Methodology & Criteria............................................................................. 9-3

9.6 Review of Planning and Development Control Framework............................................ 9-10

9.7 Existing Landscape Baseline Conditions....................................................................... 9-10

9.8 Landscape Impact Assessment................................................................................... 9-10

9.9 Existing Visual Baseline Conditions.............................................................................. 9-11

9.10 Visual Impact Assessment.......................................................................................... 9-11

9.11 Recommended Landscape and Visual Impact Mitigation Measures................................ 9-12

9.12 Residual Environmental Impact.................................................................................... 9-12

9.13 Conclusions................................................................................................................ 9-14

10 IMPACT ON CULTURAL HERITAGE........................................................................... 10-1

10.1 Introduction................................................................................................................ 10-1

10.2 Environmental Legislation, Policies, Plans, Standards and Criteria.................................. 10-1

10.3 Description of the Environment.................................................................................... 10-2

10.4 Assessment Methodology............................................................................................ 10-2

10.5 Results of Field Survey............................................................................................... 10-4

10.6 Identification of Environmental Impacts........................................................................ 10-8

10.7 Prediction and Evaluation of Impacts........................................................................... 10-9

10.8 Mitigation Measures.................................................................................................. 10-15

10.9 Residual Environmental Impact.................................................................................. 10-21

10.10 Environmental Monitoring and Audit Requirements..................................................... 10-21

10.11 Conclusions.............................................................................................................. 10-22

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

11.1 Introduction................................................................................................................ 11-1

11.2 Construction Air Quality Impact.................................................................................. 11-1

11.3 Construction Noise Impact.......................................................................................... 11-1

11.4 Water Quality Impact................................................................................................. 11-2

11.5 Waste Management Implications................................................................................. 11-2

11.6 Land Contamination.................................................................................................... 11-2

11.7 Ecological Impact....................................................................................................... 11-3

11.8 Landscape and Visual Impact...................................................................................... 11-4

11.9 Impact on Cultural Heritage........................................................................................ 11-4

12 CONCLUSIONS AND ENVIRONMENTAL OUTCOMES............................................ 12-1

12.1 Introduction................................................................................................................ 12-1

12.2 Drainage Options, Alignment and Construction Method................................................. 12-1

12.3 Construction Air Quality Impact.................................................................................. 12-2

12.4 Construction Noise Impact.......................................................................................... 12-2

12.5 Water Quality Impact................................................................................................. 12-2

12.6 Waste Management Implications................................................................................. 12-3

12.7 Land Contamination.................................................................................................... 12-3

12.8 Ecological Impact....................................................................................................... 12-4

12.9 Landscape and Visual Impact...................................................................................... 12-5

12.10 Impact on Cultural Heritage........................................................................................ 12-6

12.11 Environmental Monitoring and Audit............................................................................ 12-6

12.12 Public Consultation and Continuous Public Involvement................................................. 12-7

12.13 Overall Conclusions.................................................................................................... 12-8

13 IMPLEMENTATION SCHEDULE OF THE PROPOSED MITIGATION MEASURES……………………………………………………………………………………....13-1

Appendices

Appendix 3.1 Calculation of Dust Emission Factor

Appendix 3.2 Calculation of TSP Concentration

Appendix 4.1 Powered Mechanical Equipment (PME) for Different Construction Tasks During Normal Daytime Working Hours-Unmitigated Scenario

Appendix 4.2 Sample Calculation of Construction Noise Levels at Representative Noise Sensitive Receivers During Normal Daytime Working Hours-Unmitigated Scenario

Appendix 4.3 Powered Mechanical Equipment (PME) for Different Construction Tasks During Normal Daytime Working Hours-Mitigated Scenario

Appendix 4.4 Sample Calculation of Construction Noise Levels at Representative Noise Sensitive Receivers During Normal Daytime Working Hours-Mitigated Scenario

Appendix 4.5 Construction Programme for “Improvement Work of Ho Chung Road”

Appendix 4.6 Powered Mechanical Equipment (PME) for Different Construction Tasks During Normal Daytime Working Hours - Unmitigated Scenario (Improvement Work of Ho Chung Road)

Appendix 4.7 Sample Calculation of Cumulative Construction Noise Levels at Representative Noise Sensitive Receivers During Normal Daytime Working Hours (Drainage Improvement Work at Ho Chung and Improvement Work of Ho Chung Road)

Appendix 8.1 Representative Photographs of Habitats Recorded in the Assessment Areas

Appendix 8.2 Photographs of Species of Conservation Interest Recorded in the Assessment Areas

Appendix 8.3 Flora Recorded in the Assessment Areas

Appendix 8.4 Fauna Recorded in the Assessment Areas

Appendix 10.1 Archaeological Desk-based Review and Endorsed Methodology for Field Survey