CONTENTS
1.4 Summary of Construction Activities
1.5 Summary of EM&A Programme Requirements
1.6 Status of Other Statutory Environmental Requirements
2....... Summary of EM&A Results
2.1 Environmental Site Inspection
2.3 Marine Water Quality Monitoring
2.3.2 Action and Limit Levels for Marine Water Quality Monitoring
2.3.4 Comparison of Monitoring Results with EIA Predictions
2.4 Pilot Test on the Efficiency of Silt Curtain System
2.5.2 Action and Limit Levels for Marine Mammal Monitoring
2.5.4 Comparison of Monitoring Results with EIA Predictions
2.6 Marine Mammal Exclusion Zone Monitoring
2.7 Records of Operating Speeds and Marine Travel Routes of Working Vessels
2.8 Implementation Status of Environmental Mitigation Measures
2.9 Summary of Exceedances of the Environmental Quality Performance Limit
2.10 Summary of Environmental Complaints, Notification of Summons and Successful Prosecutions
3....... Conclusion and recommendations
Annexes
Annex B Construction Programme
Annex C Environmental Mitigation Implementation Schedule (EMIS)
Annex D Status of Statutory Environmental Requirements
Annex F Graphical Presentations of Construction Phase Marine Water Quality Monitoring Results
List of Tables
Table 1.1 Contact Information of Key Personnel
Table 1.2 Major Construction Activities Undertaken in the Reporting Period
Table 1.3 Summary of Status for the EM&A Programme under the Updated EM&A Manual
Table 2.1 Summary of Aspects for Key Observations Recorded during Site Inspections
Table 2.2 Quantities of Waste Generated for FEP-01/558/2018/A
Table 2.3 Quantities of Waste and Marine Sediment Generated for FEP-02/558/2018/A
Table 2.4 Quantities of Waste and Marine Sediment Generated for FEP-03/558/2018/B
Table 2.5 Location of Marine Water Quality Monitoring Stations
Table 2.6 Action and Limit Levels for Marine Water Quality Monitoring
Table 2.9 Efficiencies of Cage-type Silt Curtains for Dredging and Jetting Operations
Table 2.10 Action and Limit Levels for Marine Mammal Monitoring
Table 2.11 Running Quarterly STG and ANI for Finless Porpoise
Table 2.12 Marine Mammal Exclusion Zone Requirements
Table 2.13 Monitoring Results for Marine Mammal Exclusion Zone Monitoring
List of Figures
Figure 1.1 Indicative Location of Key Project Components
Figure 1.2 Location and Works Area of GRS at BPPS
Figure 1.3 Location and Works Area of GRS at LPS
Figure 2.1 Marine Water Quality Monitoring Location
Figure 2.2 Monitoring Locations for Silt Curtain Pilot Test for Dredging Operation for LPS Pipeline
Figure 2.3 Monitoring Locations for Silt Curtain Pilot Test for Dredging Operation for BPPS Pipeline
Figure 2.5 Vessel-based Marine Mammal Survey Location
Figure 2.6 Underwater PAM Survey Location
Figure 2.7 Distribution of Finless Porpoise Sightings in December 2020 and July to September 2021
To support the increased use of natural gas in Hong Kong from 2020 onwards, Castle Peak Power Company Limited (CAPCO) and The Hongkong Electric Co., Ltd. (HK Electric) have identified that the development of an offshore liquefied natural gas (LNG) receiving terminal in Hong Kong using Floating Storage and Regasification Unit (FSRU) technology (‘the Project’) presents a viable additional gas supply option that will provide energy security through access to competitive gas supplies from world markets. The Project will involve the construction and operation of an offshore LNG import facility to be located in the southern waters of Hong Kong, a double berth jetty, and subsea pipelines that connect to the gas receiving stations (GRS) at the Black Point Power Station (BPPS) and the Lamma Power Station (LPS). To demarcate the works between different parties, the following Further Environmental Permits (FEPs) were issued for the Project:
§ the double berth jetty at LNG Terminal under the Hong Kong LNG Terminal Limited (HKLTL), joint venture between CAPCO and HK Electric (FEP-01/558/2018/A) – construction commenced on 27 November 2020;
§ the subsea gas pipeline for the BPPS and the associated GRS in the BPPS under CAPCO (FEP-03/558/2018/B) – construction commenced on 23 September 2020; and
§ the subsea gas pipeline for the LPS and the associated GRS in the LPS under HK Electric (FEP-02/558/2018/A) – construction commenced on 13 December 2020.
This is the Annual EM&A Review Report presenting the EM&A works carried out during the period from 23 September 2020 to 30 September 2021 for the Project in accordance with the Updated EM&A Manual. A summary of monitoring and audit activities conducted in the reporting period is listed below:
|
Activities |
Number of Sessions |
|
For FEP-01/558/2018/A |
|
|
Marine Mammal Monitoring (vessel-based line transect survey) |
24 |
|
Passive Acoustic Monitoring (C-POD deployment) |
On-going |
|
Marine Mammal Exclusion Zone Monitoring |
During percussive piling works for construction of the Jetty |
|
Environmental Site Inspection |
5 |
|
For FEP-02/558/2018/A |
|
|
Marine Water Quality Monitoring |
34 |
|
Marine Mammal Exclusion Zone Monitoring |
During dredging / jetting operation for construction of LPS Pipeline |
|
Pilot Test on the Efficiency of Silt Curtain System – Cage-type Silt Curtain for Dredging Operation |
1 |
|
Environmental Site Inspection |
10 |
|
For FEP-03/558/2018/B |
|
|
Marine Water Quality Monitoring |
32 |
|
Marine Mammal Exclusion Zone Monitoring |
During dredging / jetting operation for construction of BPPS Pipeline |
|
Pilot Test on the Efficiency of Silt Curtain System – Cage-type Silt Curtain for Dredging Operation |
1 |
|
Environmental Site Inspection |
39 |
|
For FEP-02/558/2018/A and FEP-03/558/2018/B |
|
|
Pilot Test on the Efficiency of Silt Curtain System – Cage-type Silt Curtain for Jetting Operation |
1 |
Environmental auditing works, including regular site inspections of construction works conducted by the ET, audit of implementation of Waste Management Plan, and review of the acceptability of operating speeds and marine travel routes of working vessels, including checking of compliance with the approval conditions given by the Director of Environmental Protection for the entry of working vessels within marine parks and the proposed South Lantau Marine Park (SLMP), in pursuant to Condition 3.1 of FEP-01/558/2018/A, Condition 3.4 of FEP-02/558/2018/A and Condition 3.4 of FEP-03/558/2018/B, were conducted in the reporting period, as appropriate. No non-compliance of environmental statutory requirements was identified.
Breaches of Action and Limit Levels
There were no Project-related Action and Limit Level exceedances for marine water quality monitoring in the reporting period.
There were no breaches of Action and Limit Levels for marine mammal monitoring in the reporting period.
Environmental Complaints, Notification of Summons and Successful Prosecution
There were no environmental complaints, notification of summons and successful prosecutions recorded in the reporting period.
Reporting Changes
There were no reporting changes in the reporting period.
Comments, Recommendations and Conclusions for the Reporting Period
The recommended environmental mitigation measures for the Project were effectively implemented and the EM&A programme undertaken by the ET has effectively monitored the construction activities as well as ensured proper implementation of mitigation measures in the reporting period. The monitoring and audit activities conducted in the reporting period have been reviewed and are considered effective. As such, no change to the monitoring methodology is recommended. Based on the EM&A findings for the reporting period, the environmental performance for the construction of the Project is generally in line with the EIA predictions and considered acceptable.
To support the increased use of natural gas in Hong Kong from 2020 onwards, Castle Peak Power Company Limited (CAPCO) and The Hongkong Electric Co., Ltd. (HK Electric) have identified that the development of an offshore liquefied natural gas (LNG) receiving terminal in Hong Kong using Floating Storage and Regasification Unit (FSRU) technology (‘the Project’) presents a viable additional gas supply option that will provide energy security through access to competitive gas supplies from world markets. The Project will involve the construction and operation of an offshore LNG import facility to be located in the southern waters of Hong Kong, a double berth jetty, and subsea pipelines that connect to the gas receiving stations (GRS) at the Black Point Power Station (BPPS) and the Lamma Power Station (LPS).
The Environmental Impact Assessment (EIA) Report for the Project was submitted to the Environmental Protection Department (EPD) of the HKSAR Government in May 2018. The EIA Report (EIAO Register No. AEIAR-218/2018) was approved by EPD and the associated Environmental Permit (EP) (EP-558/2018) was issued in October 2018.
An application for Further Environmental Permits (FEPs) were made on 24 December 2019 to demarcate the works between the different parties. The following FEPs were issued on 17 January 2020 and the EP under EP-558/2018 was surrendered on 5 March 2020.
§ the double berth jetty at LNG Terminal under the Hong Kong LNG Terminal Limited (HKLTL), joint venture between CAPCO and HK Electric (FEP-01/558/2018/A) ([1]) – construction commenced on 27 November 2020;
§ the subsea gas pipeline for the BPPS and the associated GRS in the BPPS under CAPCO (FEP-03/558/2018/B) ([2]) – construction commenced on 23 September 2020; and
§ the subsea gas pipeline for the LPS and the associated GRS in the LPS under HK Electric (FEP-02/558/2018/A) ([3]) – construction commenced on 13 December 2020.
The location of these components is shown in Figures 1.1, 1.2 and 1.3.
This is the Annual EM&A Review Report for the Project which summarises the key findings of the EM&A programme during the reporting period from 23 September 2020 to 30 September 2021 for the construction works for the Project in accordance with the Updated EM&A Manual and the requirements of the Further Environmental Permits (FEP-01/558/2018/A, FEP-02/558/2018/A & FEP-03/558/2018/B).
The organisation structure of the Project is shown in Annex A. The key personnel and contact details are summarised in Table 1.1 below.
Table 1.1 Contact Information of Key Personnel
|
Party |
Position |
Name |
Telephone |
|
CAPCO / HKLTL (For FEP-01/558/2018/A and FEP-03/558/2018/B)
|
Senior Environmental Manager |
Dr Helen Chiu |
2596 4116 |
|
HK Electric / HKLTL (For FEP-01/558/2018/A and FEP-02/558/2018/A)
|
Head of Mechanical Engineering, Projects Division
|
Norman Chan
|
3143 3819
|
|
Environmental Team (ET) (ERM-Hong Kong, Limited)
|
ET Leader
|
Raymond Chow
|
2271 3281 |
|
Independent Environmental Checker (IEC) (Mott MacDonald Hong Kong Limited)
|
IEC |
Arthur Lo (Note 1)
|
2828 5757 |
|
Lydia Chak (Note 2) |
2585 8473 |
||
|
Contractor (CNOOC Offshore Oil Engineering Co. Ltd.) |
Environmental Manager |
H Y Tang |
6111 5789
|
|
Environmental Officer |
Kelvin Cheung |
9060 1020 |
|
|
Notes: (1) The duties of IEC were discharged up to 11 June 2021; and (2) The duties of IEC had been discharged since 12 June 2021. |
|||
The programme of the construction is shown in Annex B.
As informed by the Contractor, details of the major construction activities undertaken in the reporting period are listed in Table 1.2 below:
Table 1.2 Major Construction Activities Undertaken in the Reporting Period
|
FEP |
Land-based Works |
Marine-based Works |
|
FEP-01/558/2018/A |
§ Nil |
§ Jacket installation § Pile installation |
|
FEP-02/558/2018/A |
§ Preparation of intermediate hydrotesting for pipeline |
§ Pre-trenching § Dredging works § De-burial (pre-trenching) of pre-installed pipeline by Mass Flow Excavator (1) § Pipe-laying works § Intermediate hydrotesting for pipeline § Post-trenching |
|
FEP-03/558/2018/B |
§ Preparation works at the new GRS (including set-up of site offices, erection of hoarding and mobilisation of wastewater treatment facilities) § Plate Load Test – Pipe Rack § Cable pulling § Construction of reinforced concrete foundation § Underground drainage works § Drainage installation § Seawall construction § Backfill and permanent paving works § Excavation, drainage and backfilling works § Pipe rack – erection and assembly § Building superstructure works |
§ Pipe-laying works § Pre-trenching § Sheet pile installation § Post-trenching |
Remark: (1) Mass flow excavator is a variance of jetting machine.
The status of EM&A Programme for all environmental aspects required under the Updated EM&A Manual are presented in Table 1.3. The requirements of relevant environmental monitoring, including monitoring parameters, Action and Limit Levels, Event and Action Plan(s), environmental mitigation measures, etc. are presented in Section 2.
Table 1.3 Summary of Status for the EM&A Programme under the Updated EM&A Manual
|
Aspects |
Relevant FEP(s) |
Status |
|
Water Quality |
||
|
Baseline Monitoring |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ Completed |
|
Efficiency of Silt Curtain System |
FEP-02/558/2018/A FEP-03/558/2018/B |
§ Completed for cage-type silt curtain for dredging operation (under FEP-02/558/2018/A and FEP-03/558/2018/B) § Completed for cage-type silt curtain for jetting operation (under FEP-02/558/2018/A and FEP-03/558/2018/B) § To be implemented upon early stage of construction works for jetting operation for floating silt curtain (under FEP-02/558/2018/A and FEP-03/558/2018/B) |
|
Construction Phase Monitoring |
FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going for dredging / jetting operations for FEP-02/558/2018/A and FEP-03/558/2018/B |
|
Post-Construction Monitoring |
FEP-02/558/2018/A FEP-03/558/2018/B |
§ To be implemented upon completion of construction works for the Project |
|
Monitoring for Hydrotesting for the Subsea Gas Pipelines |
FEP-02/558/2018/A FEP-03/558/2018/B |
§ To be implemented during hydrotesting for the subsea gas pipelines |
|
First-year of LNG Terminal Operation |
FEP-01/558/2018/A |
§ To be implemented during LNG Terminal operation |
|
Maintenance Dredging |
FEP-01/558/2018/A |
§ To be implemented during maintenance dredging |
|
Waste Management |
||
|
Audit of Waste Management Practice |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going |
|
Ecology |
||
|
Baseline Monitoring (Vessel-based Line Transect Survey and Passive Acoustic Monitoring) |
FEP-01/558/2018/A
|
§ Completed |
|
Construction Phase Monitoring (Vessel-based Line Transect Survey and Passive Acoustic Monitoring) |
FEP-01/558/2018/A |
§ On-going (for percussive piling works for construction of the Jetty between July and December) |
|
Post-Construction Monitoring (Vessel-based Line Transect Survey and Passive Acoustic Monitoring) |
FEP-01/558/2018/A |
§ To be implemented upon completion of construction works for the Project |
|
Marine Mammal Exclusion Zone Monitoring |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going for FEP-01/558/2018/A (marine mammal exclusion zone with 500m radius) § On-going for marine dredging / jetting operations for FEP-02/558/2018/A and FEP-03/558/2018/B (marine mammal exclusion zone with 250m radius) |
|
Environmental Site Inspection |
||
|
Regular Site Inspection |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going |
|
Records of Operating Speeds and Marine Travel Routes for Working Vessels |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going |
|
Environmental Log Book |
FEP-01/558/2018/A FEP-02/558/2018/A FEP-03/558/2018/B |
§ On-going
|
The environmental licenses and permits, including further environmental permits, registration as chemical waste producer, construction noise permits, wastewater discharge license, marine dumping permits, etc., which were valid in the reporting period. No non-compliance with environmental statutory requirements was identified. The status of statutory environmental requirements is presented in Annex D.
The environmental mitigation implementation schedule (EMIS) is presented in Annex C.
The EM&A programme for the Project required environmental monitoring for marine water quality and marine mammals as well as environmental site inspections for air quality, construction noise, water quality, waste management, marine ecology, landscape and visual, and hazard to life impacts. As presented in Section 1.5, environmental site inspections and audit on waste management practice, marine water quality monitoring, including pilot tests on the efficiency of silt curtain system, marine mammal monitoring (i.e. vessel-based line transect survey and passive acoustic monitoring) and marine mammal exclusion zone monitoring were conducted during the reporting period, and the findings are summarised below.
Regular environmental site inspections were carried out with the Contractor and Project Proponents to confirm the implementation of appropriate environmental protection and pollution control mitigation measures for air quality, construction noise, water quality, waste management, marine ecology, landscape and visual, and hazard to life impacts under the Project. In the reporting period, 54 environmental site inspections were carried out, of which 5 sessions were for FEP-01/558/2018/A, 10 sessions were for FEP-02/558/2018/A and 39 sessions were for FEP-03/558/2018/B. The Independent Environmental Checker (IEC) attended 25 environmental site inspections as the IEC audits during the reporting period. Aspects for the key observations recorded during site inspections are summarised in Table 2.1. Details of observations recorded can be referred to the associated Monthly EM&A Reports for the reporting period. The environmental mitigation implementation schedule (EMIS) is presented in Annex C.
Table 2.1 Summary of Aspects for Key Observations Recorded during Site Inspections
|
Aspect |
Number of Observations |
Cumulative Number of Observations |
|
FEP-01/558/2018/A (1) (2) |
||
|
Oct-Dec 2020 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Jan-Mar 2021 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Apr-Jun 2021 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Jul-Sep 2021 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Total |
0 |
|
|
FEP-02/558/2018/A (3) (4) |
||
|
Oct-Dec 2020 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Jan-Mar 2021 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Apr-Jun 2021 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Jul-Sep 2021 |
||
|
Air quality |
1 |
1 |
|
Water quality |
0 |
0 |
|
Waste management |
0 |
0 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Total |
1 |
|
|
FEP-03/558/2018/B (5) |
||
|
Oct-Dec 2020 |
||
|
Air quality |
0 |
0 |
|
Water quality |
0 |
0 |
|
Waste Management |
1 |
1 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
0 |
|
Jan-Mar 2021 |
||
|
Air quality |
2 |
2 |
|
Water quality |
0 |
0 |
|
Waste Management |
1 |
2 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
1 |
1 |
|
Apr-Jun 2021 |
||
|
Air quality |
4 |
6 |
|
Water quality |
2 |
2 |
|
Waste Management |
4 |
6 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
0 |
1 |
|
Jul-Sep 2021 |
||
|
Air quality |
3 |
9 |
|
Water quality |
1 |
3 |
|
Waste Management |
2 |
8 |
|
Ecology |
0 |
0 |
|
Visual |
0 |
0 |
|
Hazard to life |
0 |
0 |
|
Others |
1 |
2 |
|
Total |
22 |
|
|
Notes: (1) Commencement date of construction for FEP-01/558/2018/A was 27 November 2020. (2) The piling installation vessel for construction of the jetty was under quarantine from 19 November 2020 to 2 December 2020 in Hong Kong waters. Therefore, no marine-based works for FEP-01/558/2018/A was undertaken in November 2020. Marine-based works for FEP-01/558/2018/A commenced in December 2020. (3) Commencement date of construction for FEP-02/558/2018/A was 13 December 2020. (4) The preparation works for marine-based works for FEP-02/558/2018/A (e.g. approval of marine dumping permit) were undertaken in December 2020. Therefore, no marine-based works for FEP-02/558/2018/A were undertaken in December 2020. Marine-based works for FEP-02/558/2018/A are expected to commence in January 2021. (5) Commencement date of construction for FEP-03/558/2018/B was 23 September 2020. |
||
Waste management audits were performed with reference to the Waste Management Checklists for the corresponding Waste Management Plans detailed in Annex E of the associated Monthly EM&A Reports during the regular environmental site inspections carried out in the reporting period. No non-compliance for Contractor’s waste management practices was identified during the audits.
The quantities of different types of waste and marine sediment generated for the three FEPs are summarised in Tables 2.2, 2.3 and 2.4 with reference to the waste flow tables prepared by the Contractor. General refuse was generated under the three FEPs. Inert C&D materials (public fill) and marine sediment were generated under FEP-03/558/2018/B of which the excavated marine sediment was either disposed of in the dedicated disposal grounds properly or delivered to other project as re-use while all the excavated marine sediment under FEP-02/558/2018/A was disposed of in the dedicated disposal grounds properly. Detailed waste flow tables can be referred to Annex F of the associated Monthly EM&A Reports for the reporting period.
Table 2.2 Quantities of Waste Generated for FEP-01/558/2018/A
|
Inert C&D Materials Generated (in ‘000kg) |
|||||||||||
|
Month/Year |
Total Quantity Generated |
Hard Rock and Large Broken Concrete |
Reused in the Contract |
Reused in other Projects |
Disposed as Public Fill |
Imported Fill |
|||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|||||
|
Nov 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Dec 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
Total |
0 |
0 |
0 |
0 |
0 |
0 |
|||||
|
C&D Wastes Generated |
|||||||||||
|
Month/Year |
Metals (in ‘000kg3) |
Paper / Cardboard Packaging (in ‘000kg3) |
Plastics (in ‘000kg3) |
Chemical Waste |
Other (e.g. general refuse) (in ‘000kg) |
|
|||||
|
(in ‘000kg3) |
(in ‘000L) |
|
|||||||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
||||
|
Nov 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Dec 2020 |
0 |
0 |
0 |
0 |
0 |
6.910 |
|
||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
5.140 |
|
||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
8.000 |
|
||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
19.030 |
|
||||
|
Total |
0 |
0 |
0 |
0 |
0 |
39.080 |
|
||||
|
Note: (1) Commencement date of construction for FEP-01/558/2018/A was 27 November 2020. |
|
||||||||||
Table 2.3 Quantities of Waste and Marine Sediment Generated for FEP-02/558/2018/A
|
Inert C&D Materials Generated (in ‘000kg) |
|
|||||||||||||||||
|
Month/Year |
Total Quantity Generated |
Hard Rock and Large Broken Concrete |
Reused in the Contract |
Reused in other Projects |
Disposed as Public Fill |
Imported Fill |
||||||||||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
||||||||||||
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
||||||||||||
|
Dec 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
Total |
0 |
0 |
0 |
0 |
0 |
0 |
||||||||||||
|
C&D Wastes Generated |
|
|||||||||||||||||
|
Month/Year |
Metals (in ‘000kg3) |
Paper / Cardboard Packaging (in ‘000kg3) |
Plastics (in ‘000kg3) |
Chemical Waste |
Other (e.g. general refuse) (in ‘000kg) |
|
||||||||||||
|
(in ‘000kg3) |
(in ‘000L) |
|
||||||||||||||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
|||||||||||
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
|||||||||||
|
Dec 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
26.930 |
|
|||||||||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
21.500 |
|
|||||||||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
26.230 |
|
|||||||||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
5.460 |
|
|||||||||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
4.920 |
|
|||||||||||
|
Total |
0 |
0 |
0 |
0 |
0 |
85.04 |
|
|||||||||||
|
Marine Sediment Generated (in ‘000m3) |
|
|||||||||||||||||
|
Month/Year |
Total Quantity of Type L Generated |
Total Quantity of Type M Generated |
Reused in the Contract |
Reused in other Projects |
Open Sea Disposal |
|||||||||||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
|||||||||||||
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
N/A |
|||||||||||||
|
Dec 2020 (1) |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Feb 2021 |
4.388 |
0 |
0 |
0 |
4.388 |
|||||||||||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Total |
4.388 |
0 |
0 |
0 |
4.388 |
|||||||||||||
|
Note: (1) Commencement date of construction for FEP-02/558/2018/A was 13 December 2020. |
||||||||||||||||||
Table 2.4 Quantities of Waste and Marine Sediment Generated for FEP-03/558/2018/B
|
Inert C&D Materials Generated (in ‘000kg) |
|
||||||||||||||||||
|
Month/Year |
Total Quantity Generated |
Hard Rock and Large Broken Concrete |
Reused in the Contract |
Reused in other Projects |
Disposed as Public Fill |
Imported Fill |
|||||||||||||
|
Sep 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Oct 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Nov 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Dec 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|||||||||||||
|
Jan 2021 |
244.400 |
0 |
0 |
0 |
244.400 |
0 |
|||||||||||||
|
Feb 2021 |
360.640 |
0 |
0 |
0 |
360.640 |
0 |
|||||||||||||
|
Mar 2021 |
1,274.410 |
0 |
0 |
0 |
1,274.410 |
0 |
|||||||||||||
|
Apr 2021 |
622.900 |
0 |
0 |
0 |
622.900 |
0 |
|||||||||||||
|
May 2021 |
3,077.620 |
0 |
0 |
0 |
3,077.620 |
0 |
|||||||||||||
|
Jun 2021 |
785.540 |
0 |
0 |
0 |
785.540 |
0 |
|||||||||||||
|
Jul 2021 |
1,211.060 |
0 |
0 |
0 |
1,211.060 |
0 |
|||||||||||||
|
Aug 2021 |
2,269.600 |
0 |
0 |
0 |
2,269.600 |
0 |
|||||||||||||
|
Sep 2021 |
767.130 |
0 |
0 |
0 |
767.130 |
0 |
|||||||||||||
|
Total |
10,613.300 |
0 |
0 |
0 |
10,613.300 |
0 |
|||||||||||||
|
C&D Wastes Generated |
|
||||||||||||||||||
|
Month/Year |
Metals (in ‘000kg3) |
Paper / Cardboard Packaging (in ‘000kg3) |
Plastics (in ‘000kg3) |
Chemical Waste |
Other (e.g. general refuse) (in ‘000kg) |
|
|||||||||||||
|
(in ‘000kg3) |
(in ‘000L) |
|
|||||||||||||||||
|
Sep 2020 (1) |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Oct 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Nov 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Dec 2020 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
0 |
|
||||||||||||
|
Apr 2021 |
0 |
0 |
0 |
0 |
0 |
41.230 |
|
||||||||||||
|
May 2021 |
0 |
0 |
0 |
0 |
0 |
52.280 |
|
||||||||||||
|
Jun 2021 |
0 |
0 |
0 |
0 |
0 |
28.500 |
|
||||||||||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
24.720 |
|
||||||||||||
|
Aug 2021 |
0 |
0 |
0 |
0 |
0 |
40.550 |
|
||||||||||||
|
Sep 2021 |
0 |
0 |
0 |
0 |
0 |
53.990 |
|
||||||||||||
|
Total |
0 |
0 |
0 |
0 |
0 |
241.270 |
|
||||||||||||
|
Marine Sediment Generated (in ‘000m3) |
|
||||||||||||||||||
|
Month/Year |
Total Quantity of Type L Generated |
Total Quantity of Type M Generated |
Reused in the Contract |
Reused in other Projects |
Open Sea Disposal |
|
|||||||||||||
|
Sep 2020 (1) |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Oct 2020 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Nov 2020 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Dec 2020 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Jan 2021 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Feb 2021 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Mar 2021 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Apr 2021 |
3.438 |
0 |
0 |
0 |
3.438 |
|
|||||||||||||
|
May 2021 |
79.672 |
23.169 |
0 |
1.602 |
101.239 |
|
|||||||||||||
|
Jun 2021 |
3.650 |
35.771 |
0 |
0 |
39.421 |
|
|||||||||||||
|
Jul 2021 |
0 |
0 |
0 |
0 |
0 |
|
|||||||||||||
|
Aug 2021 |
0 |
0.556 |
0 |
0 |
0.556 |
|
|||||||||||||
|
Sep 2021 |
0.282 |
0.114 |
0 |
0 |
0.396 |
|
|||||||||||||
|
Total |
87.042 |
59.610 |
0 |
1.602 |
145.050 |
|
|||||||||||||
|
Note: (1) Commencement date of construction for FEP-03/558/2018/B was 23 September 2020. |
|
||||||||||||||||||
In accordance with the Updated EM&A Manual, marine water quality monitoring shall be undertaken at the monitoring stations as shown in Figure 2.1 and Table 2.5 three times a week at both mid-ebb and mid-flood tides during periods when there are dredging / jetting operations during construction phase of BPPS Pipeline or LPS Pipeline. The interval between two sets of monitoring would not be less than 36 hours. Two replicates of in-situ measurements and samples were collected at each monitored water depth of each monitoring stations. Levels of dissolved oxygen (DO), pH value, salinity, temperature and turbidity were measured in-situ whereas the level of suspended solids (SS) were determined by a HOKLAS accredited laboratory. The detailed methodology is presented in the Updated EM&A Manual.
Table 2.5 Location of Marine Water Quality Monitoring Stations
|
Station |
Easting |
Northing |
Description |
|
Group 1 – During construction at the pipeline shore approach at LPS (KP17.4 - 18.2), West Lamma Channel (KP14.5 - 17.4) |
|||
|
IM1 |
829453 |
806896 |
Impact Station for Coastline of South Lamma |
|
IM2 |
828235 |
810347 |
Impact Station for Coastline of North Lamma |
|
E1 |
827317 |
811510 |
Control Station for Ebb Tide |
|
F1 |
827892 |
804243 |
Control Station for Flood Tide |
|
Group 2 – During construction at the Double Berth Jetty to West Lamma Channel (KP0.0 - 14.5) |
|||
|
IM3 |
820683 |
805931 |
Impact Station for Coastline of South Cheung Chau |
|
IM4 |
816997 |
805153 |
Impact Station for Coastline of South Shek Kwu Chau |
|
IM5 |
814068 |
804100 |
Boundary of Proposed South Lantau Marine Park (MP) |
|
IM6 |
814073 |
802029 |
Boundary of Proposed South Lantau MP |
|
E2 |
813367 |
808213 |
Control Station for Ebb Tide |
|
F2 |
822532 |
802161 |
Control Station for Flood Tide |
|
F3 |
815032 |
801161 |
Control Station for Flood Tide |
|
Group 3 – During construction at the Jetty Approach (KP0.0 - 5.0), South of Soko Islands (KP5.0 - 8.9), Southwest of Soko Islands (KP8.9 - 12.1) |
|||
|
IM6 |
814073 |
802029 |
Boundary of Proposed South Lantau MP |
|
IM7 |
811652 |
802029 |
Boundary of Proposed South Lantau MP |
|
IM8 |
810833 |
801430 |
Boundary of Proposed South Lantau MP |
|
IM9 |
807101 |
801595 |
Boundary of Proposed South Lantau MP |
|
E3 |
802686 |
804123 |
Control Station for Ebb Tide |
|
F3 |
815032 |
801161 |
Control Station for Flood Tide |
|
Group 4 – During construction at the Adamasta Channel (KP12.1 - 15.6), Southwest Lantau (KP15.6 - 21.3) |
|||
|
IM10 |
803145 |
806407 |
Boundary of Southwest Lantau MP |
|
IM11A |
801914 |
806510 |
Boundary of Southwest Lantau MP |
|
IM12 |
801041 |
807024 |
Boundary of Southwest Lantau MP |
|
IM13 |
800386 |
810750 |
Boundary of Southwest Lantau MP |
|
IM14 |
801376 |
810750 |
Boundary of Southwest Lantau MP |
|
E4 |
801571 |
811923 |
Control Station for Ebb Tide |
|
F4 |
809058 |
806567 |
Control Station for Flood Tide |
|
Group 5 – During construction at the West of Tai O to West of HKIA (KP21.3 - 31.5) |
|||
|
IM15 |
804820 |
821110 |
Boundary of Sha Chau and Lung Kwu Chau MP |
|
E5 |
804634 |
822606 |
Control Station for Ebb Tide |
|
F5 |
805185 |
816591 |
Control Station for Flood Tide |
|
Group 6 – During construction at the West of HKIA to Lung Kwu Chau (KP31.5 - 37.5) |
|||
|
IM15 |
804820 |
821110 |
Boundary of Sha Chau and Lung Kwu Chau MP |
|
IM17 |
804865 |
827855 |
Boundary of Sha Chau and Lung Kwu Chau MP |
|
IM16A |
805039 |
824343 |
Coral Colonies at Pak Chau |
|
E6 |
805418 |
832113 |
Control Station for Ebb Tide |
|
F5 |
805185 |
816591 |
Control Station for Flood Tide |
|
Group 7 – During construction at the Lung Kwu Chau to Urmston Anchorage (37.5 - 41.1), Urmston Road (KP41.1 - 42.9) |
|||
|
IM17 |
804865 |
827855 |
Boundary of Sha Chau and Lung Kwu Chau MP |
|
IM18 |
806220 |
827890 |
Boundary of Sha Chau and Lung Kwu Chau MP |
|
IM19 |
807274 |
829250 |
Impact Station for Coastline of Lung Kwu Tan |
|
E6 |
805418 |
832113 |
Control Station for Ebb Tide |
|
F6 |
808812 |
824266 |
Control Station for Flood Tide |
|
E5 |
804634 |
822606 |
Control Station for Flood Tide |
|
Group 8 – During construction at the West of BPPS (KP42.9 - 44.9), Pipeline shore approach at BPPS (KP44.9 - 45.0) |
|||
|
IM19 |
807274 |
829250 |
Impact Station for Coastline of Lung Kwu Tan |
|
IM20A |
809445 |
831728 |
Impact Station for Coastline of Deep Bay |
|
IM21A |
808879 |
830900 |
Coral Colony at Artificial Seawall at BPPS |
|
IM22A |
808703 |
830717 |
Coral Colony at Artificial Seawall at BPPS |
|
E7A |
808313 |
833524 |
Control Station for Ebb Tide |
|
F6 |
808812 |
824266 |
Control Station for Flood Tide |
|
Note: Alternative monitoring stations (E7A, IM11A, IM16A, IM20A, IM21A & IM22A) were proposed by the ET in consultation with the IEC and approved by EPD in accordance with the provision in Section 5.1 and Section 5.2.5 of the Updated EM&A Manual. |
|||
The Action and Limit Levels for marine water quality monitoring have been established based on the baseline marine water quality monitoring data in accordance with the Updated EM&A Manual. Action and Limit Levels of key assessment parameters for construction phase marine water quality monitoring including DO, turbidity and SS are summarised in Table 2.6.
Table 2.6 Action and Limit Levels for Marine Water Quality Monitoring
|
Parameter |
Action Level |
Limit Level |
|
|
Group 1 – During construction at the pipeline shore approach at LPS (KP17.4 - 18.2), West Lamma Channel (KP14.5 - 17.4) |
|||
|
DO in mg L-1 a |
Surface and Middle 4.2 mg L-1
Bottom 2.4 mg L-1 |
Surface and Middle 2.9 mg L-1
Bottom 1.6 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
14.4 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
19.9 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
20.8 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
29.6 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 2 – During construction at the Double Berth Jetty to West Lamma Channel (KP0.0 - 14.5) |
|||
|
DO in mg L-1 a |
Surface and Middle 3.4 mg L-1
Bottom 1.8 mg L-1 |
Surface and Middle 2.4 mg L-1
Bottom 1.4 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
17.1 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
26.8 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
25.7 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
37.1 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 3 – During construction at the Jetty Approach (KP0.0 - 5.0), South of Soko Islands (KP5.0 - 8.9), Southwest of Soko Islands (KP8.9 - 12.1) |
|||
|
DO in mg L-1 a |
Surface and Middle 4.1 mg L-1
Bottom 2.7 mg L-1 |
Surface and Middle 3.0 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
17.0 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
30.9 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
22.3 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
36.9 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 4 – During construction at the Adamasta Channel (KP12.1 - 15.6), Southwest Lantau (KP15.6 - 21.3) |
|||
|
DO in mg L-1 a |
Surface and Middle 3.4 mg L-1
Bottom 2.8 mg L-1 |
Surface and Middle 2.5 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
63.1 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
165.7 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
75.4 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
121.8 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 5 – During construction at the West of Tai O to West of HKIA (KP21.3 - 31.5) |
|||
|
DO in mg L-1 a |
Surface and Middle 4.6 mg L-1
Bottom 4.0 mg L-1 |
Surface and Middle 4.0 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
31.9 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
46.6 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
64.9 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
72.5 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 6 – During construction at the West of HKIA to Lung Kwu Chau (KP31.5 - 37.5) |
|||
|
DO in mg L-1 a |
Surface and Middle 4.4 mg L-1
Bottom 3.9 mg L-1 |
Surface and Middle 3.9 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
30.7 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
47.0 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
49.2 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
74.0 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 7 – During construction at the Lung Kwu Chau to Urmston Anchorage (37.5 - 41.1), Urmston Road (KP41.1 - 42.9) |
|||
|
DO in mg L-1 a |
Surface and Middle 3.8 mg L-1
Bottom 3.1 mg L-1 |
Surface and Middle 3.4 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
34.5 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
79.2 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
37.8 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
98.2 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Group 8 – During construction at the West of BPPS (KP42.9 - 44.9), Pipeline shore approach at BPPS (KP44.9 - 45.0) |
|||
|
DO in mg L-1 a |
Surface and Middle 4.3 mg L-1
Bottom 3.6 mg L-1 |
Surface and Middle 3.4 mg L-1
Bottom 2.0 mg L-1 |
|
|
Turbidity in NTU (Depth-averaged b) c |
34.3 NTU, and 120% of the relevant control station's turbidity at the same tide of the same day |
58.5 NTU, and 130% of the relevant control station's turbidity at the same tide of the same day |
|
|
SS in mg L-1 (Depth-averaged b) c |
42.4 mg L-1, and 120% of the relevant control station's SS at the same tide of the same day |
78.2 mg L-1, and 130% of the relevant control station's SS at the same tide of the same day |
|
|
Notes: a. For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits. b. “Depth-averaged” is calculated by taking the arithmetic means of reading of all three depths. c. For Turbidity and SS, non-compliance of the water quality limits occurs when monitoring result is higher than the limits. |
|||
The Event and Action Plan for marine water quality monitoring can be referred to the Updated EM&A Manual.
A total of 66 monitoring events for construction phase marine water quality monitoring were conducted for construction of BPPS Pipeline and LPS Pipeline within the works area(s) for the associated marine-based activities in the reporting period. The percentage compliance of marine water quality monitoring results within the corresponding Action and Limit Levels is presented in Table 2.7. There were no Project-related Action and Limit Level exceedances for marine water quality monitoring in the reporting period. Graphical presentations are provided in Annex F.
Table 2.7 Percentage Compliance of Marine Water Quality Monitoring Data within Action and Limit Levels
|
Month/Year |
DO |
DO |
Turbidity |
SS |
|
Group 1 – During construction at the pipeline shore approach at LPS (KP17.4 - 18.2), West Lamma Channel (KP14.5 - 17.4) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
100% |
100% |
100% |
100% |
|
Mar 2021 |
100% |
100% |
100% |
100% |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
100% |
83.3% |
100% |
100% |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
N/A |
N/A |
N/A |
N/A |
|
Total |
100% |
94.4% |
100% |
100% |
|
Group 2 – During construction at the Double Berth Jetty to West Lamma Channel (KP0.0 - 14.5) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
100% |
100% |
100% |
100% |
|
Feb 2021 |
100% |
100% |
100% |
100% |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
100% |
89.3% |
100% |
100% |
|
Sep 2021 |
100% |
87.5% |
100% |
100% |
|
Total |
100% |
94.2% |
100% |
100% |
|
Group 3 – During construction at the Jetty Approach (KP0.0 - 5.0), South of Soko Islands (KP5.0 - 8.9), Southwest of Soko Islands (KP8.9 - 12.1) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
100% |
100% |
100% |
100% |
|
May 2021 |
100% |
100% |
100% |
97.9% |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
N/A |
N/A |
N/A |
N/A |
|
Total |
100% |
100% |
100% |
99.0% |
|
Group 4 – During construction at the Adamasta Channel (KP12.1 - 15.6), Southwest Lantau (KP15.6 - 21.3) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
N/A |
N/A |
N/A |
N/A |
|
Total |
N/A |
N/A |
N/A |
N/A |
|
Group 5 – During construction at the West of Tai O to West of HKIA (KP21.3 - 31.5) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
100% |
100% |
100% |
100% |
|
Total |
100% |
100% |
100% |
100% |
|
Group 6 – During construction at the West of HKIA to Lung Kwu Chau (KP31.5 - 37.5) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
N/A |
N/A |
N/A |
N/A |
|
Total |
N/A |
N/A |
N/A |
N/A |
|
Group 7 – During construction at the Lung Kwu Chau to Urmston Anchorage (37.5 - 41.1), Urmston Road (KP41.1 - 42.9) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
100% |
100% |
83.3% |
83.3% |
|
May 2021 |
100% |
100% |
93.9% |
95.5% |
|
Jun 2021 |
100% |
100% |
90.0% |
93.3% |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
N/A |
N/A |
N/A |
N/A |
|
Sep 2021 |
N/A |
N/A |
N/A |
N/A |
|
Total |
100% |
100% |
89.1% |
90.7% |
|
Group 8 – During construction at the West of BPPS (KP42.9 - 44.9), Pipeline shore approach at BPPS (KP44.9 - 45.0) |
||||
|
Oct 2020 |
N/A |
N/A |
N/A |
N/A |
|
Nov 2020 |
N/A |
N/A |
N/A |
N/A |
|
Dec 2020 |
N/A |
N/A |
N/A |
N/A |
|
Jan 2021 |
N/A |
N/A |
N/A |
N/A |
|
Feb 2021 |
N/A |
N/A |
N/A |
N/A |
|
Mar 2021 |
N/A |
N/A |
N/A |
N/A |
|
Apr 2021 |
N/A |
N/A |
N/A |
N/A |
|
May 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jun 2021 |
N/A |
N/A |
N/A |
N/A |
|
Jul 2021 |
N/A |
N/A |
N/A |
N/A |
|
Aug 2021 |
100% |
95.8% |
100% |
100% |
|
Sep 2021 |
100% |
100% |
93.8% |
93.8% |
|
Total |
100% |
97.9% |
96.9% |
96.9% |
|
Notes: (1) The figures in percentage are calculated with reference to the number of depth-averaged data with the corresponding Action and Limit Levels divided by the total number of depth-averaged data for each monitoring parameter. (2) N/A denotes that no marine water quality monitoring (WQM) was required to be conducted in the month. |
||||
Amongst the eight groupings for marine water quality monitoring (WQM) (i.e. Groups 1 to 8), no marine WQM was required to be conducted for Group 4 and Group 6 as no marine dredging / jetting operations were undertaken within the respective works areas for construction of BPPS Pipeline in the reporting period while marine WQM data of the four monitoring parameters (i.e. DO (Surface and Middle), DO (Bottom), turbidity and SS) for Group 5 recorded in the reporting period were within the corresponding Action and Limit Levels.
In general, the levels of DO, turbidity and SS complied with the Action and Limit Levels during most of the time (~ >90%). Investigations on all the Action and/or Limit Levels exceedances were carried out in accordance with the Event and Action Plan for marine WQM, and all the exceedances were considered non-Project related based on the investigation results which have been presented in the corresponding Monthly EM&A Reports for the reporting period.
Notwithstanding, the Contractor was reminded to ensure the mitigation measures for water quality impacts as set out in the Updated EM&A Manual are fully and properly implemented.
SS and DO levels in terms of SS elevation and DO depletion, respectively, at each sensitive receiver as a result of marine-based construction activities were assessed and predicted in the approved EIA Report. With reference to Figures 7.2 and 7.3 of the approved EIA Report, 22 impact stations and the corresponding sensitive receivers and/or model observation points are presented in Table 2.8.
Table 2.8 Impact Stations for Marine Water Quality Monitoring and the Corresponding Sensitive Receivers and Model Observation Points
|
Impact Station |
Fisheries Sensitive Receiver |
Ecological Sensitive Receiver |
Water Quality Sensitive Receiver |
Model Observation Point |
|||
|
Group 1 – During construction at the pipeline shore approach at LPS (KP17.4 - 18.2), West Lamma Channel (KP14.5 - 17.4) |
|||||||
|
IM1 |
§ Fisheries Spawning/ Nursery Grounds in South Lantau (B8, B9, MPE) |
§ Potential South Lamma MP (MPE) § Corals at Hung Shing Yeh and Ha Mei Wan (CR20, CR21) |
§ Gazetted Beaches at Hung Shing Yeh Beach and Lo So Shing Beach (B8, B9) § Seawater Intake at Lamma Power Station (C13) |
§ N/A |
|||
|
IM2 |
§ N/A |
§ Corals at Shek Kok Tsui and Pak Kok (CR12, CR13) |
§ N/A |
§ N/A |
|||
|
Group 2 – During construction at the Double Berth Jetty to West Lamma Channel (KP0.0 - 14.5) |
|||||||
|
IM3 |
§ Fisheries Spawning/ Nursery Grounds in South Lantau (NB9) |
§ N/A |
§ Non-gazetted Beaches at Po Yue Wan (NB9) |
§ N/A |
|||
|
IM4 |
§ Fisheries Spawning/ Nursery Grounds in South Lantau (CR4) |
§ Corals at Shek Kwu Chau (CR4) |
§ N/A |
§ N/A |
|||
|
IM5 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-6) |
|||
|
IM6 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-5) |
|||
|
Group 3 – During construction at the Jetty Approach (KP0.0 - 5.0), South of Soko Islands (KP5.0 - 8.9), Southwest of Soko Islands (KP8.9 - 12.1) |
|||||||
|
IM6 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-5) |
|||
|
IM7 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-4) |
|||
|
IM8 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-3) |
|||
|
IM9 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPD-2) |
|||
|
Group 4 – During construction at the Adamasta Channel (KP12.1 - 15.6), Southwest Lantau (KP15.6 - 21.3) |
|||||||
|
IM10 |
§ N/A |
§ Intertidal Mudflats/ Mangroves/ Horseshoe Crab Nursery Grounds at Fan Lau Tung Wan (MPC-5) |
§ Non-gazetted Beaches at Fan Lau Tung Wan (NB4) |
§ Boundary of existing and proposed MPs (MPC-5) |
|||
|
IM11A |
§ N/A |
§ N/A |
§ Non-gazetted Beaches at Fan Lau Sai Wan (NB3) |
§ Boundary of existing and proposed MPs (MPC-4) |
|||
|
IM12 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPC-3) |
|||
|
IM13 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPC-2) |
|||
|
IM14 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPC-1) |
|||
|
Group 5 – During construction at the West of Tai O to West of HKIA (KP21.3 - 31.5) |
|||||||
|
IM15 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPA-3) |
|||
|
Group 6 – During construction at the West of HKIA to Lung Kwu Chau (KP31.5 - 37.5) |
|||||||
|
IM15 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPA-3) |
|||
|
IM16A |
§ Fisheries Spawning Ground in North Lantau (CR3) § Artificial Reef Deployment Area at Sha Chau and Lung Kwu Chau (AR1) |
§ Sha Chau and Lung Kwu Chau MP (MPA-5) § Corals at Pak Chau (CR3) |
§ N/A |
§ N/A |
|||
|
IM17 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPA-2) |
|||
|
Group 7 – During construction at the Lung Kwu Chau to Urmston Anchorage (37.5 - 41.1), Urmston Road (KP41.1 - 42.9) |
|||||||
|
IM17 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPA-2) |
|||
|
IM18 |
§ N/A |
§ N/A |
§ N/A |
§ Boundary of existing and proposed MPs (MPA-1) |
|||
|
IM19 |
§ N/A |
§ Intertidal Mudflats/ Mangroves/ Horseshoe Crab Nursery Grounds at Lung Kwu Sheung Tan (NB1) |
§ Non-gazetted Beaches at Lung Kwu Sheung Tan (NB1) |
§ N/A |
|||
|
Group 8 – During construction at the West of BPPS (KP42.9 - 44.9), Pipeline shore approach at BPPS (KP44.9 - 45.0) |
|||||||
|
IM19 |
§ N/A |
§ Intertidal Mudflats/ Mangroves/ Horseshoe Crab Nursery Grounds at Lung Kwu Sheung Tan (NB1) |
§ Non-gazetted Beaches at Lung Kwu Sheung Tan (NB1) |
§ N/A |
|||
|
IM20A |
§ N/A |
§ Intertidal Mudflats/ Mangroves/ Horseshoe Crab Nursery Grounds at Ha Pak Nai (H1) § Seagrass Beds at Ha Pak Nai (H1) |
§ Seawater Intake at Sludge Treatment Facilities (C1) |
§ N/A |
|||
|
IM21A |
§ N/A |
§ Corals at Artificial Seawall at BPPS (CR1) |
§ N/A |
§ N/A |
|||
|
IM22A |
§ N/A |
§ Corals at Artificial Seawall at BPPS (CR2) |
§ N/A |
§ N/A |
|||
|
|
|
|
|
|
|||
For the marine WQM stations under Group 1 and Group 2 (i.e. IM1 and IM2 for Group 1; and IM3, IM4, IM5 and IM6 for Group 2), all SS levels at these marine WQM stations in the reporting period were within the corresponding Action/Limit Levels resulting in being in line with the EIA predictions (i.e. compliance with Water Quality Objective (WQO) for SS in terms of percentage in both dry and wet seasons under Dredging Scenario C01A and Jetting Scenario C06 as reported in Table 7C.1 and Table 7C.8 of Annex 7C in the approved EIA Report, respectively).
For the marine WQM stations under Group 3 (i.e. IM6, IM7, IM8, IM9), all SS levels at these marine WQM stations in the reporting period were within the corresponding Action/Limit Levels except that at IM9 on 24 May 2021 with an Action Level exceedance recorded, resulting in 99.0% being within the corresponding Action/Limit Levels within the reporting period. Given the Action Level exceedance in SS recorded at IM9 on 24 May 2021 was considered non-Project related upon investigation, all SS levels were considered being generally in line with the EIA predictions (i.e. compliance with WQO for SS in terms of percentage in both dry and wet seasons under Dredging Scenario C01A as reported in Table 7C.1 of Annex 7C in the approved EIA Report).
For the marine WQM station under Group 5 (i.e. IM15), all SS levels at this marine WQM station in the reporting period were within the corresponding Action/Limit Levels resulting in being in line with the EIA predictions (i.e. compliance with WQO for SS in terms of percentage in both dry and wet seasons under Jetting Scenario C04 as reported in Table 7C.6 of Annex 7C in the approved EIA Report).
For the marine WQM stations under Group 7 (i.e. IM17, IM18 and IM19), most of the SS levels at these stations in the reporting period were within the corresponding Action/Limit Levels except those at IM17 and IM18 on 28 April 2021; at IM18 and IM19 on 10 May 2021; at IM18 on 26 May 2021; at IM18 on 7 June 2021; and at IM19 on 9 June 2021 with Action/Limit Level exceedances recorded, resulting in 90.7% being within the corresponding Action/Limit Levels within the reporting period. Given the Action/Limit Level exceedances in SS recorded at the marine WQM stations on these dates were considered non-Project related upon investigation, all SS levels were considered being generally in line with the EIA predictions (i.e. compliance with WQO for SS in terms of percentage in both dry and wet seasons under Dredging Scenario C01C as reported in Table 7C.3 of Annex 7C in the approved EIA Report).
For the marine WQM stations under Group 8 (i.e. IM19, IM20A, IM21A and IM22A), most of the SS levels at these stations in the reporting period were within the corresponding Action/Limit Levels except the one at IM19 on 6 September 2021 with Action Level exceedance recorded, resulting in 96.9% being within the corresponding Action/Limit Levels within the reporting period. Given the Action Level exceedances in SS recorded at IM19 on these dates were considered non-Project related upon investigation, all SS levels were considered being generally in line with the EIA predictions (i.e. compliance with WQO for SS in terms of percentage in both dry and wet seasons under Dredging Scenario C01A as reported in Table 7C.1 of Annex 7C in the approved EIA Report).
In addition, the SS levels at the corresponding marine WQM stations (e.g. IM6, IM15, IM16A, IM21A, IM22A, etc.) in the reporting period were all in line with the EIA predictions under mitigated scenarios (i.e. implementation of the recommended mitigation measures for water quality impacts for associated with marine-based construction activities such as deployment of silt curtains during the course of dredging/ jetting operations) with reference to Tables 7C.10, 7C.12, 7C.15 and 7C.17 of Annex 7C in the approved EIA Report.
According to Annex 7D of the approved EIA Report, the predicted maximum DO depletion values for all sensitive receivers associated with marine-based construction activities are well below their corresponding allowable DO depletion values, of which the maximum DO depletion of 0.2 mg/L amongst all sensitive receivers was predicted and no unacceptable depletion of DO from the marine-based construction activities was also anticipated as documented in the approved EIA Report (see Section 7.7.1).
Despite the Action/Limit Level exceedances in DO were recorded throughout the reporting period, all were considered non-Project related upon investigation, implying that the DO levels at the relevant sensitive receivers were considered being generally in line with the EIA predictions as reported in Table 7D.1 of Annex 7D in the approved EIA Report.
The monitoring methodology for marine water quality was reviewed, including the routine operations of marine water quality monitoring associated with construction phase marine water quality monitoring data within the reporting period, the monitoring was able to detect change in water quality with reference to the EIA predictions based on the monitoring data in terms of DO and SS levels. Therefore, the monitoring methodology for marine water quality is considered effective and no change to monitoring methodology is recommended.
According to Condition 2.10 of FEP-02/558/2018/A and FEP-03/558/2018/B, and Section 5.3.2 of the Updated EM&A Manual, pilot tests on the efficiency of silt curtain system shall be conducted during the early stage of construction to confirm the removal efficiency of the silt curtains. The pilot tests on the efficiency of silt curtain system include i) testing of silt removal efficiency of 75% or higher for silt curtain at grab dredger; ii) testing of silt removal efficiency of 85% or higher for silt curtain at jetting machine; and iii) testing of silt removal efficiency of 80% or higher for double layer silt curtain at sensitive receivers, as determined by the difference between the SS levels near marine works area and that outside silt curtain in the event of the dredging / jetting operations being actively undertaken for BPPS Pipeline and/or LPS Pipeline. The detailed methodology of the pilot tests on the efficiency of silt curtain system is presented in the approved Silt Curtain Deployment Plans for the corresponding FEPs.
Pilot tests on the efficiencies of cage-type silt curtain at grab dredgers for LPS Pipeline and BPPS Pipeline were conducted on 2 February and 7 June 2021, respectively, while pilot test on the efficiency of cage-type silt curtain at jetting machine for both LPS and BPPS Pipelines was conducted on 26 August 2021. The monitoring stations for the pilot tests are presented in Figures 2.2, 2.3 and 2.4.
The monitoring results of the pilot tests are summarised in Table 2.9, which shows that the silt removal efficiencies of cage-type silt curtains were greater than the EIA assumptions (75% and 85% for cage-type silt curtain at grab dredger and jetting machine, respectively) demonstrating that the tested silt curtains are capable of achieving efficiencies greater than the required as assumed in the approved EIA Report for the Project. As such, the proposed cage-type silt curtains are effective for the dredging and jetting operations for the Project to minimize water quality impacts and no further measures/recommendations are required.
Table 2.9 Efficiencies of Cage-type Silt Curtains for Dredging and Jetting Operations
|
Round |
Silt Curtain Efficiency (%) |
|
|
Individual |
Overall-average |
|
|
For silt curtain at grab dredger for LPS Pipeline |
||
|
1 |
N/A |
87.01 (*) |
|
2 |
87.25 |
|
|
3 |
86.77 |
|
|
For silt curtain at grab dredger for BPPS Pipeline |
||
|
1 |
83.89 |
92.59 |
|
2 |
96.27 |
|
|
3 |
97.61 |
|
|
For silt curtain at jetting machine for both BPPS and LPS Pipelines |
||
|
1 |
99.74 |
96.05 |
|
2 |
99.88 |
|
|
3 |
88.54 |
|
|
Remark: (*) Only representative SS data for Rounds 2 and 3 of the pilot test were used for determination of silt curtain efficiency with respect to fact that the relatively low SS levels were detected inside silt curtain for the dredging operation during Round 1 of the pilot test. |
||
In accordance with the Updated EM&A Manual, vessel-based marine mammal survey by means of systematic line-transect boat survey was undertaken to examine the distribution and encounter rate of Finless Porpoise (FP) in southern Lantau where a majority of Project construction works would take place. Survey transects covered three survey areas for line-transect boat surveys, namely Southwest Lantau (SWL), Southeast Lantau (SEL) and Lamma (LM) are presented in Figure 2.5. The methodology of the survey is consistent and compatible with that adopted in the EIA baseline surveys as well as the long-term marine mammal monitoring programme conducted by AFCD since 1995 to allow potential comparisons and pooling data for analysis. Vessel-based line transect marine mammal surveys are conducted during construction of the LNG Terminal. Each transect line is surveyed twice per month. The detailed methodology is presented in the Updated EM&A Manual.
In accordance with the Updated EM&A Manual, underwater PAM survey using C-POD (Cetacean-Porpoise Detector) was conducted at five locations as presented in Figure 2.6. C-PODs are left in place during construction of the LNG Terminal. Such duration should allow for a robust record of marine mammal usage of the area to be obtained and allow for the inter-seasonal differences already known for finless porpoises. The C-PODs have to be serviced every two to four months, subject to review on an as-needed basis, to download accumulated data and replace batteries.
The Action and Limit Levels for marine mammal monitoring are established using encounter rate calculated from the six-month baseline vessel-based line transect surveys from the three survey areas as a whole in accordance with the Updated EM&A Manual. The combined baseline encounter rate will be used to compare with the encounter rate obtained during construction phase monitoring calculated from last three month’s monitoring data (i.e. running quarterly value). This approach would allow natural seasonal fluctuations in FP encounter rate to be accounted for, and allow data to be reviewed every month such as appropriate remedial actions could be taken timely if the threshold values are triggered. The Action and Limit Levels are provided in Table 2.10.
Table 2.10 Action and Limit Levels for Marine Mammal Monitoring
|
Monitoring Area |
Action Level |
Limit Level |
|
SWL, SEL and LM as a whole |
Running quarterly STG < 1.12 & ANI < 2.18 |
Two consecutive running quarterly STG < 1.12 & ANI < 2.18 |
|
Notes: STG = Encounter Rate of Number of Porpoise Sightings ANI = Encounter Rate of Number of Porpoises Action / Limit Levels will be triggered if both STG and ANI fall below the criteria. |
||
The Event and Action Plan for marine mammal monitoring can be referred to relevant Annexes of the associated Monthly EM&A Reports for the reporting period.
A total of 24 vessel-based line transect surveys were conducted during the reporting period. The FPs sighted in the three survey areas, SWL, SEL and LM, in the reporting period are presented in Figure 2.7.
The running quarterly STG and ANI for the combined survey areas from SWL, SEL and LM during the reporting period are summarised in Table 2.11.
Table 2.11 Running Quarterly STG and ANI for Finless Porpoise
|
Survey Period |
On-effort (km) |
No. of Sighting |
No. of Porpoise |
STG |
ANI |
Running STG |
Running ANI |
|
Dec 2020 |
219.30 |
3 |
7 |
1.36 |
3.18 |
- |
- |
|
Jul 2021 |
375.86 |
0 |
0 |
0.00 |
0.00 |
0.83 |
2.95 |
|
Aug 2021 |
379.00 |
2 |
10 |
0.53 |
2.64 |
||
|
Sep 2021 |
331.64 |
7 |
22 |
2.11 |
6.63 |
||
|
Notes: Only data collected at Beaufort Sea State 2 or below were included for encounter rate analysis. Running STG and Running ANI were calculated by combining three consecutive survey months data (i.e. running STG/ANI for Sep 2021 were calculated by combining the data in Jul – Sep 2021). |
|||||||
The running quarterly values of encounter rate in terms of STG and ANI were 0.83 and 2.95, respectively. Therefore, there were no breaches of Action and Limit Levels for marine mammal monitoring in the reporting period.
Five C-POD units have been deployed at the five locations since the commencement of construction for FEP-01/558/2018/A on 27 November 2020. These units will be serviced every two to four months, subject to review on an as-needed basis, to download accumulated data and replace batteries. The latest round of C-POD servicing was conducted in early July 2021.
The results of the vessel-based line transect marine mammal surveys within the reporting period indicated that there were no breaches of Action and Limit Levels for marine mammal monitoring, indicating that there were no unacceptable/ unforeseen changes in FP distribution as a result of jacket installation works. It should be noted that with implementation of the recommended mitigation measures during construction phase of the Project, no unacceptable impacts on FPs were anticipated as documented in the approved EIA Report. The recommended mitigation measures have been implemented/ adopted during the course of piling works, including the use of structural jacket and bubble curtain to enclose the pile installation work, acoustic decoupling of noisy equipment on work barges, piling with ramp-up procedures; use of hydraulic hammering with noise reduction system; avoidance of underwater percussive piling at night time and during the peak occurrence season of FP; and monitoring of marine mammal exclusion zone with a radius of 500m. The review on the encounter rates of FP (i.e. 0.83 for running STG and 2.95 for running ANI) for the reporting period, at which no Action / Limit Level exceedances in marine mammal monitoring were triggered during the piling works. Therefore, variation between the EIA study predictions and the EM&A monitoring results was not found.
According to Condition 3.7 of FEP-02/558/2018/A, Condition 3.8 of FEP-03/558/2018/B, Section 9.11.3 of the approved EIA Report and Section 7 of the Updated EM&A Manual, marine mammal exclusion zone monitoring is required during dredging / jetting operations for construction of BPPS Pipeline or LPS Pipeline and during percussive piling works for construction of the Jetty. Marine mammal exclusion zone requirements are presented in Table 2.12.
Table 2.12 Marine Mammal Exclusion Zone Requirements
|
Activity |
Exclusion Zone |
Requirement |
|
Marine dredging or jetting operations for construction of BPPS Pipeline or LPS Pipeline |
250m |
Before pipeline dredging or jetting commence, the exclusion zone must have been continuously clear of marine mammals for 30 minutes. During pipeline dredging/ jetting, if marine mammals are spotted within the exclusion zone, pipeline dredging/ jetting works will cease and will not resume until the observer confirms that the zone has been continuously clear of marine mammals for a period of 30 minutes. |
|
Percussive piling works for construction of the Jetty |
500m |
Before percussive piling commences, the exclusion zone must have been continuously clear of marine mammals for 30 minutes. During percussive piling, if marine mammals are spotted within the exclusion zone, percussive piling works will cease and will not resume until the observer confirms that the zone has been continuously clear of marine mammals for a period of 30 minutes. |
Marine mammal exclusion zone monitoring was conducted during the reporting period when marine dredging / jetting operations for construction of BPPS / LPS Pipeline and percussive piling works for construction of the Jetty were undertaken. No sightings of marine mammals were observed during marine mammal exclusion zone monitoring in the reporting period. The monitoring results for marine mammal exclusion zone monitoring in the reporting period is summarised in Table 2.13.
Table 2.13 Monitoring Results for Marine Mammal Exclusion Zone Monitoring
|
Date |
Active works activities |
Monitoring results |
|
11, 12, 14-16, 18, 19, 21 Dec 2020 |
Percussive piling works for construction of the Jetty |
No sightings of marine mammals within the marine mammal exclusion zone |
|
2, 3, 5, 7, 12, 14-17 Jul 2021 |
||
|
5-7, 9, 11, 13, 14, 21, 23-27 Aug 2021 |
||
|
13, 16, 18 Sep 2021 |
||
|
27 Jan 2021 |
Marine dredging operation at Double Berth Jetty for LPS Pipeline (1) |
|
|
1, 2, 4 Feb 2021 |
||
|
23, 26, 27 Feb 2021 |
De-burial (pre-trenching) of pre-installed pipeline by Mass Flow Excavator for LPS Pipeline |
|
|
5, 6, 13-15 Mar 2021 |
||
|
24 Apr 2021 |
Marine dredging operation at Subsea Cable Sterile Corridors for BPPS Pipeline |
|
|
16-28 May 2021 |
||
|
28-30 Apr 2021 |
Marine dredging operation at Urmston Road for BPPS Pipeline |
|
|
1-26, 30, 31 May 2021 |
||
|
1-12 Jun 2021 |
||
|
5, 6, 8-18, 22-26 Jul 2021 |
Marine jetting operation at West Lamma Channel for LPS Pipeline |
|
|
8-16, 24-31 Aug 2021 |
Marine jetting operation at South of Shek Kwu Chau to Lamma Channel for LPS Pipeline |
|
|
1-8, 12-14, 17-23 Sep 2021 |
||
|
26-31 Aug 2021 |
Marine dredging operation at Pipeline Shore Approach at BPPS for BPPS Pipeline |
|
|
1, 8, 9 Sep 2021 |
||
|
18-30 Sep 2021 |
Marine jetting operation at West of Tai O to West of HKIA for BPPS Pipeline |
|
|
Note: (1) Pre-trenching works was not undertaken on 27 January 2021 due to adverse weather and malfunction of the grab dredger. |
||
The operating speeds and marine travel routes of working vessels for construction of the Project within the reporting period were checked and reviewed. A total of 29 working vessels were used for the construction of the Jetty, LPS Pipeline and BPPS Pipeline under FEP-01/558/2018/A, FEP-02/558/2018/A and FEP-03/558/2018/B, respectively, during the reporting period. All these working vessels were operated at a speed lower than 10 knots when moving within the areas frequented by marine mammals, including the waters near Sha Chau and Lung Kwu Chau Marine Park, the waters at the west of Lantau Island and the waters between Soko Islands and Shek Kwu Chau, and followed the relevant marine travel requirements stipulated in the FEP. No non-compliance on the operating speeds and marine travel routes of working vessels was identified. Records of operating speeds and marine travel routes of working vessels for construction of the Project provided by the Contractor can be referred to the relevant Annexes of the associated Monthly EM&A Reports for the reporting period.
The compliance status on approval conditions given by the Director of Environmental Protection for the entry of working vessels (i.e. anchor handling tugs (AHTs)) within marine parks and the proposed SLMP in pursuant to Condition 3.1 of FEP-01/558/2018/A for anchoring activities for piling operation and jacket installation for construction of the Jetty, Condition 3.4 of FEP-02/558/2018/A and Condition 3.4 of FEP-03/558/2018/B for anchoring activities for pipelaying and/or post-trenching processes for construction of LPS and BPPS Pipelines, respectively, as appropriate within the reporting period was checked. A total of three AHTs with 34 entries to marine parks and the proposed SLMP were recorded within the reporting period. No non-compliance on the approval conditions was identified. Records of entry events of working vessels within marine parks and the proposed SLMP provided by the Contractor can be referred to relevant Annexes of the associated Monthly EM&A Reports for the reporting period.
A summary of the Environmental Mitigation Implementation Schedule (EMIS) is presented in Annex C. The necessary mitigation measures were implemented properly for the Project.
There were no Project-related Action and Limit Level exceedances for marine water quality monitoring in the reporting period.
There were no breaches of Action and Limit Levels for marine mammal monitoring in the reporting period.
Cumulative statistics on exceedance is provided in Annex E.
There were no environmental complaints, notification of summons and successful prosecutions recorded in the reporting period.
Statistics on environmental complaints, notification of summons and successful prosecutions are summarised in Annex E.
This Annual EM&A Review Report presents the key findings of the EM&A works during the reporting period from 23 September 2020 to 30 September 2021 for the construction works for the Project in accordance with the Updated EM&A Manual and the requirements of the Further Environmental Permits (FEP-01/558/2018/A, FEP-02/558/2018/A & FEP-03/558/2018/B).
Environmental auditing works, including regular site inspections of construction works conducted by the ET, audit of implementation of Waste Management Plan, and review of the acceptability of operating speeds and marine travel routes of working vessels, including checking of compliance with the approval conditions given by EPD for allowing the entry of working vessels within marine parks and the proposed SLMP in pursuant to Condition 3.1 of FEP-01/558/2018/A, Condition 3.4 of FEP-02/558/2018/A and Condition 3.4 of FEP-03/558/2018/B, were conducted in the reporting period, as appropriate. No non-compliance of environmental statutory requirements was identified.
Marine water quality monitoring was conducted during the reporting period in accordance with the Updated EM&A Manual. No Project-related Action and Limit Level exceedances were recorded. Marine water quality monitoring data within the reporting period were reviewed with reference to the approved EIA Report. The results were generally in line with the EIA predictions. The monitoring methodology for marine water quality was reviewed and no change to monitoring methodology is recommended.
Pilot tests on the efficiencies of silt curtain system (cage-type silt curtain for dredging / jetting operations) were conducted during the reporting period in accordance with the approved Silt Curtain Deployment Plans. The results of the pilot tests have demonstrated that the tested cage-type silt curtains for dredging / jetting operations is capable of achieving an efficiency greater than 75% and 85% for dredging operation and jetting operation, respectively, as assumed in the approved EIA Report for the Project. As such, the proposed cage-type silt curtains are effective for the dredging / jetting operations for the Project to minimize water quality impacts and no further measures/recommendations are required.
Marine mammal monitoring (vessel-based line transect survey and passive acoustic monitoring) was conducted during the reporting period in accordance with the Updated EM&A Manual. No breaches of Action and Limit Levels were recorded. Variation between the EIA study predictions and the EM&A monitoring results was not found.
There were no environmental complaints, notification of summons and successful prosecutions recorded in the reporting period.
The recommended environmental mitigation measures for the Project were effectively implemented and the EM&A programme undertaken by the ET has effectively monitored the construction activities as well as ensured proper implementation of mitigation measures in the reporting period. The monitoring and audit activities conducted in the reporting period have been reviewed and are considered effective. As such, no change to the monitoring methodology is recommended. Based on the EM&A findings for the reporting period, the environmental performance for the construction of the Project is generally in line with the EIA predictions and considered acceptable.
([1]) Application for variation of an environmental permit for FEP-01/558/2018 was undertaken and the latest FEP (FEP-01/558/2018/A) was issued on 6 November 2020.