DRAINAGE SERVICES DEPARTMENT LAND DRAINAGE DIVISION Agreement No. CE 27/94 r FINAL REPORT - TASK 6 ENVIRONMENTAL IMPACT ASSESSMENT (VOLU~ . • . Li lJl :1.C'~f May 1997 Hyder Consulting Limited in association with Delft Hydraulics • Dredging Research Limited University of Strathclyde • Hyder Environmental Limited [ Agreement No CE27/94 Territorial Land Drainage and Flood Control Strategy Study Phase III - Sedimentation Study [ Final Report, Task 6 - Environmental Impact Assessment E EP.D. Libr2\l-Y [ [ C D D c FINAL REPORT - TASK 6 o ENVIRONMENTAL [ IMPACT ASSESSMENT (VOLU~p_.B.b··.'., I• -,." ~,--." '1''' ~ ....... - '"; - _,,; .~. t)i .r.lJ Y [ May 1997 C [ C [ [ [ [ \[ Hyder Consulting Limited RT-1360-84/0 IICOVER.DOC 1L [ [ Q [ C o o o o o [ [ o [ o [ c VOLUMEB [ [ L f L Agreement No CE27/94 Territorial Land Drainage and Flood Control Strategy Study Phase ill - Sedimentation Study [ Final Report, Task 6 - Environmental Impact Assessment C VOLUMEB LIST OF FIGURES LIST OF TABLES C LIST OF APPENDICES o 10. EIA OF DREDGING WORKS IN RIVER SILVER 10.1 Introduction 10.2 Existing Environment o 10.3 Proposed Works 10.4 Key Issues o 10.5 Impact Assessment o 10.6 Mitigation Measures 11. EIA OF DREDGING WORKS IN STAUNTON CREEK NULLAH D 11.1 Introduction 11.2 Existing Environment o 11.3 Proposed Works 11.4 Key Issues [ 11.5 Impact Assessment o 11.6 Mitigation Measures 12. EIA OF DREDGING WORKS IN KAI TAK 12.1 Introduction o 12.2 Existing Environment 12.3 Proposed Works c 12.4 Key Issues 12.5 Impact Assessment o 12.6 Mitigation Measures o 13. EIA OF DREDGING WORKS IN SHING MUN RIVER CHANNEL 13.1 Introduction [ 13.2 Existing Environment 13.3 Proposed Works [ 13.4 Key Issues 13.5 Impact Assessment [ 13.6 Mitigation Measures [: , Contents Page .", Hyder Consulting Limited . ') RT-1360-84/01 I CONT.DOC Page 6 of13 Agreement No CE27/94 L Territorial Land Drainage and Flood Control Strategy Stody Phase III - Sedimentation Stody Final Report, Task 6 - Environmental Impact Assessment [ 14. EIA OF DREDGING WORKS IN TAl PO I LAM TSUEN RIVER CHANNELS AND TRIBUTARIES E 14.1 Introduction 14.2 Existing Environment [ 14.3 Proposed Work 14.4 Key Issues [ 14.5 Impact Assessment 14.6 Mitigation Measures o 15. EIA OF DREDGING WORKS IN THE RIVER INDUS CHANNEL 15.1 Introduction c 15.2 Existing Environment 15.3 Proposed Works o 15.4 Key Issues .......... 15.5 Impact Assessment o 15.6 Mitigation Measures o 16. EIA OF DREDGING WORKS IN THE SAN TIN RIVER CHANNEL 16.1 Introduction o 16.2 Existing Environment 16.3 Proposed Works [ 16.4 Key Issues 16.5 Impact Assessment 16.6 Mitigation Measures c 17. EIA OF DREDGING WORKS IN YUEN LONG, KAM TIN AND NGAU TAM c MEl MAIN DRAINAGE CHANNEL 17.1 Introduction o 17.2 Existing Environment 17.3 Proposed Works c 17.4 Key Issues 17.5 Impact Assessment 17.6 Mitigation Measures c 18. EIA OF DREDGING WORKS IN TIN SHUI W AI RIVER CHANNELS [ 18.1 Introduction 18.2 Existing Environment [ 18.3 Proposed Works [ Hyder Consulting Limited Contents Page RT-1360-84/01 I CONT.DOC Page 7 of13 r L ) Agreement No CE27/94 Territorial Land Drainage and Flood Control Strategy Study Phase III - Sedimentation Study [ Final Report, Task 6 - Environmental Impact Assessment n 18.4 Key Issues L 18.5 Impact Assessment 18.6 Mitigation Measures [ 19_ EIA OF DREDGING WORKS IN TUEN MUN RIVER CHANNEL o 19.1 Introduction 19.2 Existing Environment 19.3 Proposed Works o 19.4 Key Issues 19.5 Impact Assessment o 19.6 Mitigation Measures o 20. EIA OF DREDGING WORKS IN SO KWUN WAT RIVER CHANNEL 20.1 Introduction o 20.2 Existing Environment 20.3 Proposed Works o 20.4 Key Issues 20.5 Impact Assessment c 20.6 Mitigation Measures [ 21. EIA OF DREDGING WORKS IN TAl LAM CHUNG RIVER CHANNEL 21.1 Introduction o 21.2 Existing Environment 21.3 Proposed Works [ 21.4 Key Issues 21.5 Impact Assessment 21.6 Mitigation Measures 22. EIA OF DREDGING WORKS IN SHAM TSENG NULLAH o 22.1 Introduction 22.2 Existing Environment o 22.3 Proposed Works 22.4 Key Issues [ 22.5 Impact Assessment 22.6 Mitigation Measures [ REFERENCES APPENDICES [ COMMENTS AND RESPONSES Hyder Consulting Limited Contents Page ! - RT-1360-84/01 I CONT.DOC Page 8 of 13 Agreement No CE27/94 L Territorial Land Drainage and Flood Control Strategy Stndy Phase III - Sedimentation Stndy Final Report, Task 6 - Environmental Impact Assessment [ LIST OF FIGURES 10.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging E Locations: River Silver 10,2 Water Quality Monitoring Results from 15/04/1996: River Silver [ 10.3 Sediment Grab Analysis Results: River Silver [ 11.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: Staunton Creek Nullah 11.2 Sediment Core Analysis Results: Staunton Creek Nullah and Kai Tak o Nullah c 12.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: Kai Tak Nullah 12.2 Sediment Grab Analysis Results: Kai Tak Nullah o .13.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging o Locations: Shing Mun River and Tributaries 13.2 Water Quality Monitoring Results from 17/04/1996: Shing Mun River and Tributaries o 13.3 Sediment Grab Analysis Results: Shing Mun River and Tributaries 13.4 Sediment Core Analysis Results: Shing Mun River and Tributaries o 14.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: Tai Po RiverlLam Tsuen River Channel and Tributaries 14.2 Water Quality Monitoring Results from 17/0411996: Tai Po RiverlLam Tsuen River Channel and Tributaries o 14.3 Sediment Core Analysis Results: Tai Po RiverlLam Tsuen River Channel and Tributaries c 15.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: River Indus Channel and Tributaries - Present Scenario o 15.2 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: River Indus Channel and Tributaries - Future Scenario c 15.3 Water Quality Monitoring Results from 16/04/1996: River Indus and Tributaries [ 15.4 Sediment Core Analysis Results: River Indus and Tributaries 16.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging l Locations: San Tin Main Drainage Channels - Present Scenario 16.2 Potential Noise and Air Sensitive Receivers Near Proposed Dredging [ Locations: San Tin Main Drainage Channels - Future Scenario [ Hyder Consulting Limited Contents Page RT-1360-84/011 CONT.DOC Page 9 of13 r L Agreement No CE27/94 Territorial Land Drainage and Flood Control Strategy Study Phase III - Sedimentation Study C Final Report, Task 6 - Environmental Impact Assessment 16.3 Sediment Core Analysis Results: San Tin Main Drainage Channels 16.4 Bird Transect Locations: San Tin Drainage Channels 16.5 Proposed Dredging Locations In Relation To Restricted Areas: [ Tin Shui wai W &E Drainage Channels San Tin Main Drainage Channels - Present Scenario 16.6 Proposed Dredging Locations In Relation To Restricted Areas: c San Tin Main Drainage Channels and Yuen Long - Futnre Scenario o 17.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: Yuen Long / Kam Tin / Ngau Tam Mei River Channels - o Future Scenario 18.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging o Locations: Tin Shui Wai Western and Eastern Drainage Channels 18.2 Water Quality Monitoring Results from 16/04/1996: Tin Shui Wai Western and Eastern Drainage Channels o 18.3 Sediment Core Analysis Results: Tin Shui Wai Western and Eastern Drainage Channels o 18.4 Bird Transect Locations: Tin Shui Wai Western and Eastern Chainage Channels c 19.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: Tuen Mun River Channel c 19.2 Water Quality Monitoring Results from 18/04/1996: Tuen Mun River Channel o 19.3 Sediment Core Analysis Results: Tuen Mun River Channel 20.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging Locations: So Kwun Wat Drainage Channel o 20.2 Sediment Grab Analysis Results: So Kwun Wat Drainage Channel 21.1 Potential Noise and Air Sensitive Receivers Near Proposed Dredging o Locations: Tai Lam Chung River Channel 21.2 Sediment Grab Analysis Results: Tai Lam Chung River Channel [ 22.1 Potential Noise.and Air Sensitive Receivers Near Proposed Dredging Locations: Sham Tseng Nullah [ 22.2 Water Quality Monitoring Results from 18/04/1996: Sham Tseng Nullah [ [ Hyder Consulting Limited Contents Page [ RT-1360-84/01/CONT.DOC Page 10 of 13 Agreement No CE27/94 L Territorial Land Drainage and Flood Control Strategy Study Phase III - Sedimentation Study Final Report, Task 6 - Environmental Impact Assessment [ LIST OF TABLES E 10.1 Summary of Baseline Air Quality Monitoring Results 10.2 Summary of Baseline Noise Monitoring Results C 10.3 Summary of Water Quality Monitoring Results 10.4 Description of Noise Sensitive Receivers C 10.S Typical mix of Equipment for Dredging Operations 10.6 Unmitigated Noise Levels at NSRs 10.7 Mitigated Noise Levels at NSRs D 11.1 Description of Noise Sensitive Receivers D 11.2 Typical mix of Equipment for Dredging Operations 11.3 Unmitigated Noise Levels at NSRs D 13.1 Summary of Baseline Air Quality Monitoring Results D 13.2 Summary of Baseline Noise Monitoring Results 13.3 Summary of Water Quality Monitoring Results D 13.4 Description of Noise Sensitive Receivers 13.S Typical mix of Equipment for Dredging Operations D 13.6 Unmitigated Noise Levels at NSRs 13.7 Mitigated Noise Levels atNSRs D 14.1 Summary of Baseline Air Quality Monitoring Results 14.2 Summary of Baseline Noise Monitoring Results D 14.3 Summary of Pollutant Loadings into Tolo Harbour 14.4 Summary of Water Quality Monitoring Results 0 14.S Water Quality at Station ES 14.6 Water Quality at Station E6 0 14.7 Description of Noise Sensitive Receivers 14.8 Typical mix of Equipment for Dredging Operations C 14.9 Unmitigated Noise Levels at NSRs .