Agreement No. CE 13/2009 (WS)

In-situ Reprovisioning of Sha Tin Water Treatment Works South Works

 

Environmental Impact Assessment Report

 

TABLE OF CONTENTS

 

 

List of Figures

 

Figure 2.1 Location Plan and the Major Scope of Works

Figure 2.2 Existing Water Flow Schematic

Figure 2.3 Existing Process Flow Diagram

Figure 2.4 Reprovisioned Process Flow Diagram

Figure 2.5 General Layout under Current Operation

Figure 2.6 General Layout under Construction

Figure 3.1 Layout Plan of Reprovisioned Sha Tin Water Treatment Works

Figure 4.1 Locations of Representative Air Sensitive Receivers

Figure 4.2 Locations of Construction Works Area

Figure 4.3 Locations of Demolition Works Area

Figure 5.1 Locations of Representative Noise Sensitive Receivers

Figure 6.1 Locations of Water Sensitive Receivers

Figure 8.1 Walk-transect and Sampling Location for Terrestrial Wildlife Survey (sheet 1 of 2)

Figure 8.2 Walk-transect and Sampling Location for Terrestrial Wildlife Survey (sheet 2 of 2)

Figure 8.3 Habitat Map (sheet 1 of 2)

Figure 8.4 Habitat Map (sheet 2 of 2)

Figure 8.5 Woodland Compensation Area (sheet 1 of 2)

Figure 8.6 Woodland Compensation Area (sheet 2 of 2)

Figure 8.7 Key Plan on Habitat Affected by the Proposed Works

Figure 9.1.0 Landscape and Visual Impacts Study Boundary

Figure 9.1.1 Planning and Development Control Framework

Figure 9.2.1 Landscape Resources Plan

Figure 9.2.2 Photo of Landscape Resources

Figure 9.3.1 Landscape Character Areas Plan

Figure 9.3.2 Photo of Landscape Character Areasfig\fig04.01.pdf

Figure 9.4.1 Key Visual Sensitive Receivers Plan (VSR)

Figure 9.4.2 Photo of Visual Sensitive Receivers

Figure 9.5.1 Landscape and Visual Mitigations Measures

Figure 9.5.2 Landscape Master Plan

Figure 9.6.1 Photomontage Viewpoint Locations

Figure 9.6.2 Photomontage Viewpoint from Hin Wan House of Hin Keng Estate (sheet 1 of 4)

Figure 9.6.3 Photomontage Viewpoint from Hin Wan House of Hin Keng Estate (sheet 2 of 4)

Figure 9.6.4 Photomontage Viewpoint from Hin Wan House of Hin Keng Estate (sheet 3 of 4)

Figure 9.6.5 Photomontage Viewpoint from Hin Wan House of Hin Keng Estate (sheet 4 of 4)

Figure 10.1 Cultural Heritage Resources within 300m Study Area

Figure 10.2 Geology of the Study Area

Figure 11.1 Location Plan and the Major Scope of Works

Figure 11.2 Potential Hotspot

Figure 11.3 Schematic Layout Plan for Area A and Proposed Sampling Location

Figure 11.4 Schematic Layout Plan for Area B and Proposed Sampling Location

Figure 11.5 Schematic Layout Plan for Area C and Sampling Location

Figure 11.6 Schematic Layout Plan for Area D, E and Sampling Location

Figure 11.7 Schematic Layout Plan for Area F and Sampling Location

Figure 11.8 Schematic Layout Plan for Area G and Sampling Location

Figure 11.9 Schematic Layout Plan for Area H, I and L and Sampling Location

Figure 11.10 Schematic Layout Plan for Area J and Sampling Location

Figure 11.11 Schematic Layout Plan for Area K and Sampling Location

Figure 12.1 Societal Risk Guidelines for Acceptable Risk Levels (EIAO-TM)

Figure 12.2 Sha Tin WTW Location and Consultation Zone

Figure 12.3 Existing Layout of Sha Tin WTW

Figure 12.4 Topography of the Sha Tin WTW Area (not to scale)

Figure 12.5 New Treatment Facilities and Sha Tin WTW Layout following the Reprovisioning of South Works

Figure 12.6 Existing Chlorine Delivery Route at Sha Tin WTW and the New Route to be used during and after the Reprovisioning of South Works

Figure 12.7 FN curve from the 2001 Sha Tin WTW Hazard Assessment (ERM, 2001)

Figure 12.8 Population Units used in QRA (figure 1 of 2)

Figure 12.9 Population Units used in QRA (figure 2 of 2)

Figure 12.10 Population Units for the Reprovisioning Works

Figure 12.11 Beacon Hill North Gas Offtake Station

Figure 12.12 FN Curves for STWTW: Construction Phase (PLL for Total Population is 7.4E-5 and PLL for Construction Population is 2.28E-5)

Figure 12.13 FN Curve for STWTW: Operational Phase (PLL for Total Population is 6.0E-5)

Figure 12.14 Individual Risk Contours

Figure 12.15 FN Curve for the Mitigated Case of Construction Phase Scenario (PLL for Total Population is 6.2E-5 and PLL for Construction Population is 1.14E-5)

Figure 12.16 Chlorine Transport Route to Sha Tin Water Treatment Works

Figure 12.17 Open (blue) and Urban (red) Sections of the Delivery Route

Figure 12.18 ALOHA Consequence Contours, RD Case

Figure 12.19 ALOHA Consequence Contours, RDM1 Case

Figure 12.20 Presentation of Consequence Results

Figure 12.21 Drum Lashing and Clamp Arrangements

Figure 12.22 Chlorine Transport Route and PDZ Zones

Figure 12.23 A Map of OZPs in Ma Wan

Figure 12.24 Population Polygons

Figure 12.25 FN Curves for Off-site Chlorine Transport

Figure 12.26 FN Curves for Off-site Chlorine Transport Breakdown by Scenario

Figure 12.27 Individual Risk for Off-site Chlorine Transport, Operational Phase

Figure 12.28 Mitigated FN Curves for STWTW

Figure 12.29 FN Curves for Total Chlorine Risk of STWTW

Figure 12.30 Chlorine Total Individual Risk, Operational Phase

Figure 12.31 FN Curves of cumulative risks within STWTW Consultation Zone

Figure 12.32 Cumulative Individual Risk - Construction Phase

Figure 12.33 Cumulative Individual Risk Operational Phase

 

 

Appendices

 

Appendix 2.1 Construction Programme

Appendix 2.2 Drinking Water Quality Standards

Appendix 5.1 Measurement Results for Prevailing Noise Levels

Figure A5.1 Measurement Locations for Prevailing Noise Levels

Appendix 5.2 Powered Mechanical Equipment (PME) for Demolition/Construction Tasks (Without Mitigation Measures)

Figure A5.2.1 Locations of Construction Works Area

Figure A5.2.2 Locations of Demolition Works Area

Figure A5.2.3 Locations of Haul Road

Appendix 5.3 Details of Noise Measurement and Assessment of Existing Plants at Sha Tin Water Treatment Work

Appendix 5.4 Noise Measurement Results for Existing Plants for North Works of Sha Tin WTW

Appendix 5.5 Calculations of Construction Noise Levels (without Mitigation Measures)

Appendix 5.6 Powered Mechanical Equipment (PME) for Demolition/Construction Tasks (with Mitigated Measures)

Appendix 5.7 Calculations of Construction Noise Levels (with Mitigation Measures)

Appendix 5.8 Calculations of Fixed Plant Noise

Figure A5.8 Locations of Fixed Plant Noise Sources

Appendix 7.1 Construction and Demolition Material Management Plan (C&DMMP)

Appendix 7.2 Public Fill Committee Endorsement on C&DMMP

Appendix 8.1 Representative Photographs of Habitats Recorded within the Study Area

Appendix 8.2 Photographs of Species of Conservation Importance

Appendix 8.3 Plant Species Recorded within the Assessment Area at Sha Tin WTW

Appendix 8.4 Fauna Recorded from the Study Area

Appendix 9.1 Illustration of landscape and visual mitigation measures

Appendix 10.1 Built Heritage Recording Sheets

Appendix 11.1 Final Contamination Assessment Plan

Appendix 12.1 DRIFT Flat Terrain Dispersion Modelling

Appendix 12.2 Wind Tunnel Test Results for Sha Tin WTW

Appendix 12.3 CFD Modelling Results for Sha Tin WTW and Tai Po Tau WTW

Appendix 12.4 Application of Chlorine Dispersion Modelling Results in QRA

Appendix 12.5 Chlorine Cloud Height Predictions

Appendix 12.6 Definition of Time Periods and Population Scaling Factors

Appendix 12.7 Seismic Hazard Assessment

Appendix 12.8 Quantitative Assessment of Potential Hazards due to Construction Activities

Appendix 12.9 Potential Impacts of Construction Works on the 400kV Power Line

Appendix 12.10 Human Error Assessment & Reduction Technique (HEART)

Appendix 12.11 Off-site Chlorine Transport Risk from SSK Dock to STWTW

 

 

Plates

 

Plate 10.1 1963 Aerial Photo of Sha Tin showing the Pre-reclaimed Landscape