Revision History
|
Rev. |
Description of Modification |
Date |
|
1. |
Awaiting for comments |
27/09/2024 |
|
2. |
First Issue for comments |
22/10/2024 |
|
3. |
Second Issue for comments |
23/10/2024 |
CONTENTS
Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions26
|
Appendix A |
Master Programme |
|
Appendix B |
Overview of Desalination Plant in Tseung Kwan O |
|
Appendix C |
Summary of Implementation Status of Environmental Mitigation |
|
Appendix D |
Water Quality Monitoring Graphical Presentation |
|
Appendix E |
Summary of Exceedances |
|
Appendix F |
Waste Flow Table |
|
Appendix G |
Complaint Log |
|
Appendix H |
Event/Action Plan for Water Quality Monitoring |
|
Appendix I |
Event/Action Plan for Construction Noise Exceedance |
|
Appendix J |
Event/Action Plan for Coral Monitoring Exceedance |
Introduction
A1. The Project, Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (TKODP), is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is currently governed by a Further Environmental Permit (EP No. FEP - 01/503/2015/B) for the construction and operation of the Contract.
A2. In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Contract, EM&A works for marine water quality, noise, waste management and ecology should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Contract.
A3. According to the contractor’s information, the works of TKODP were substantially completed on 30 June 2024 and the plant commenced the operation phase on 1 July 2024. The outstanding construction works were being carried out during this reporting period.
A4. This is the 18th Quarterly EM&A Report, prepared by ASCL, for the Contract summarizing the monitoring results and audit findings of the EM&A programme at and around Tseung Kwan O Area 137 (TKO 137) during the reporting period from 1 June 2024 to 31 August 2024.
A5. The EM&A programme for this contract has covered environmental monitoring on construction noise level at selected NSRs and Contractor’s environmental performance auditing in the aspects of construction dust, construction noise, water quality, waste management, Landscape and Visual and Ecology.
Summary of Main Works Undertaken & Key Mitigation Measures Implemented
A6. Key activities carried out in this reporting period for the Project included the followings:
|
Administration Building - Carrying out the floor tiles works at G/F - External wall painting works - Construction of block work for pipe duct - Installation of building services, cable laying, electrical switchboard, testing and commissioning - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; - Minor Installation of building services, minor cables laying and termination. T&C |
|
Chemical building - Installation of leakage collection pit cover - Underground utility construction work - Landscape work at roof - Defect rectification |
|
Main Electrical & Central Chiller Plant Building - Installation of chillers, building services, electrical switchboard and cable laying - Installation of Roof Tile for Fuel Tank Room |
|
ActiDAFF - Underground utility construction work - Installation of access opening cover - Construction of staircase no 2 - Installation of mechanical equipment, piping system, installation of building services, electrical switchboards and cable laying, fiber-reinforced plastic cover Installation |
|
Product Water Storage Tank Building - Installation of Cat Ladders in Water Tank A - Sealing slab opening in water Tank A - Re-construction of Wall PW8 in Water Tank A -
Installation of metal
cladding, building
services, cable laying, mechanical equipment, steel pipe - Underground utility construction |
|
OSCG Building - Protective Coating for dangerous goods Rooms - Placing Soil Mix at Roof - Installation of Metal Cladding (at East Side) and Roller Shutters and Window - Underground utility construction work - Installation of building services, mechanical equipment and cable laying, testing and commissioning |
|
Reverse Osmosis Building - Installation of building services, electrical switchboard, cable laying, Installation of mechanical equipment, steel pipe, Glass Reinforced Plastic pipe, raised floor, testing and commissioning - Installation of metal cladding, handrailing, roller shutters, glass canopy and glass house - Underground utility construction work - Construction of Reinforced Concrete External Wall for Male Toilet |
|
Post Treatment Building - Installation of building services, Installation of mechanical equipment and piping system, Pressure Test - Underground utility construction work - Installation of Cat Ladders in Water Tanks - Installation of Metal Cladding - Placing Soil Mix at Roof |
|
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
|
Inspection corridor - Installation of building services, Lift installation - Construction of roof tiling works and staircases no. 2 - Installation of Movement Joints and glass window |
|
CO2 Tanks - Installation of pipes and electrical wiring, testing and commissioning Combined Shaft and Pump room - Finishing, Grating; window; louvre installation - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Other - Watermain works at CLP 132 kV Substation - Staircases construction; Steel Bridge assembly and installation at elevated walkway - Road Construction, Footpath Construction, Landscape Construction, Irrigation System Construction, Water Pressure Test for Fire Services and Plumbing System in Zone A, B, C - Structure Construction, steel fence erection of Wave Deflector Wall at seawall area - Slope work* |
*Remark: No site activity for the slope works from 4 May 2024 to 26 August 2024.
A7. The major environmental impacts brought by the above construction works and slope works include:
- Construction dust and noise generation from excavation works, construction works;
- Waste generation from the construction activities
A8. The key environmental mitigation measures implemented for the Project in this reporting period associated with the above construction works include:
- Dust suppression by regular wetting and water spraying for construction works and slope works;
- Reduction of noise from equipment and machinery on-site and regularly inspection to
machinery and plants/vehicles on-site to ensure proper functioning;
- Sorting and storage of general refuse and construction waste;
- Deployment of silt curtain at the inshore water outflow; and
- Deployment protective fencing for trees.
Summary of Exceedance & Investigation & Follow-up
A9. No noise monitoring was conducted during the reporting period since there are no project- related construction activities undertaken within a radius of 300m from the monitoring locations. No exceedance of the Action Level was recorded during the reporting period.
A10. Referring to EM&A Manual, the general water quality monitoring should be carried out when there are marine-related construction activities undertaken. General water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) was ceased from 1 September 2023 due to the completion of marine-related construction works.
A11. The pre-operation phase water quality was conducted during 1 June 2024 to 30 June 2024. The operation phase water quality was conducted from 1 July 2024 to 31 August 2024. Six (6) of the pre-operation phase water quality monitoring results of SS obtained had exceeded the Action Level. Twenty-three (23) of the pre-operation phase water quality monitoring results of SS obtained during the reporting period had exceeded the Limit Level. Thirty (30) of the operation phase water quality monitoring results of SS obtained had exceeded the Action Level. Ninety-nine (99) of the operation phase water quality monitoring results of SS obtained during the reporting period had exceeded the Limit Level. After investigation, all exceedances were concluded unrelated to the Project.
A12. The continuous monitoring of effluent quality was conducted from 1 July 2024 to 31 August 2024 in accordance with the EM&A Manual. No exceedance of the sampling was obtained during the reporting period had exceeded the Limit Level.
A13. In this reporting period, 171 times of Construction Phase landfill gas monitoring were recorded at Wan Po Road (Ch0+390 - Ch0+780) and (Ch0+400 - Ch1+200). No action and limit level exceedance for methane, oxygen and carbon dioxide was recorded.
A14. In this reporting period, Operation Phase landfill gas monitoring was conducted on 18, 19 July 2024, 16 and 17 August 2024. No exceedances of action level and limit level was observed.
A15. Pre-operation phase monthly coral monitoring was conducted during the reporting period on 17 June 2024. Operation phase monthly coral monitoring was conducted during the reporting period on 18 July 2024 and 21 August 2024. There is no AL/LL exceedance during the monitoring period.
A16. Operation phase fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024. The detail of the monitoring will be presented once the result is available.
A17. Total thirteen (13) times of Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. Three (3) times of weekly Joint site inspections were carried out by ET and IEC.
A18. A summary of the EM&A activities in this reporting period is listed in Table I and summary of the environmental exceedance of the reporting period is tabulated in Table II.
Table I Summary Table for EM&A
Activities in the Reporting Period
|
EM&A Activities |
June 2024 |
July 2024 |
Aug 2024 |
|
Noise Monitoring |
N/A |
N/A |
N/A |
|
Pre-operation Phase Water Quality Monitoring |
4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27 and 29 June 2024 |
N/A |
N/A |
|
Operation Phase Water Quality Monitoring |
N/A |
2, 4, 6, 8, 10, 13, 16, 18, 20, 22, 24, 27 and 30 July 2024 |
1, 3, 5, 7, 10, 13, 15, 17, 19, 21, 24, 27, 29 and 31 August 2024 |
|
TRC Monitoring for Main Disinfection |
N/A |
N/A |
N/A |
|
Pre-operation Phase Coral Monitoring |
17 June 2024 |
N/A |
N/A |
|
Operation Phase Coral Monitoring |
N/A |
18 July 2024 |
21 August 2024 |
|
Pre-operation Phase Fishery Monitoring |
N/A |
N/A |
N/A |
|
Operation Phase Fishery Monitoring |
N/A |
N/A |
24 and 31 August 2024 |
|
Landfill Gas Monitoring (Construction Phase) |
1,3,4,5,6,7,8,11,12,13,1 4,15,26,27 and 28 June 2024 |
1, 2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 22, 23, 24, 25, 26, 27, 29,30 and 31 July 2024 |
1,2, 3, 5, 6, 7, 8, 9, 10, 12,13, 14,15, 16, 18,19, 20, 21, 22, 23, 24, 26, 27, 28, 29, 30 and 31 Aug 2024 |
|
Landfill Gas Monitoring (Operation Phase) |
N/A |
16 and 17 July 2024 |
16 and 17 August 2024 |
|
Environmental Site Inspection |
4, 11, 18 and 24 June 2024 |
2, 9, 16, 23 and 29 July 2024 |
6, 13, 20 and 26 August 2024 |
|
Continuous Monitoring of Effluent Quality |
N/A |
From 1 to 31 July 2024 |
From 1 to 31 August 2024 |
Table II Summary Table
for Exceedance in the Reporting Period
|
Environmental Monitoring |
Parameter |
No. of non- Project related exceedance |
Total No. of non-Project related exceedance |
No. of Project related exceedance |
Total No.
of Project related exceedance |
||
|
AL |
LL |
AL |
LL |
||||
|
Noise |
Leq (30min) |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Water |
DO |
0 |
0 |
0 |
0 |
0 |
0 |
|
Turbidity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
SS |
36 |
122 |
158 |
0 |
0 |
0 |
|
|
pH |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Salinity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
TRC |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Landfill Gas |
O2 |
0 |
0 |
0 |
0 |
0 |
0 |
|
CH4 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
CO2 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Continuous Monitoring of Effluent Quality |
Temperature |
0 |
0 |
0 |
0 |
0 |
0 |
|
pH |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Salinity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Total Residual Chlorine |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Suspended Solids |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Iron-Soluble |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Total Inorganic Nitrogen |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Total Phosphorus |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Sodium Metabisulphite |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Anti-scalant as Reactive Phosphorus |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Coral Monitoring |
/ |
0 |
0 |
0 |
0 |
0 |
0 |
|
Fisheries Monitoring* |
/ |
/ |
/ |
/ |
/ |
/ |
/ |
*Remark: Operation phase fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024. The detail of the monitoring will be presented once the result is available.
Complaint Handling and
Prosecution
A19. No environmental complaint was received during the reporting period. No notifications of summons or prosecution was received during the reporting period.
Reporting Change
A20. There was no change to be reported that may affect the on-going EM&A programme.
A21. According to the contractor’s information, the TKODP commenced operation phase on 1 July 2024. The outstanding construction works were being carried out during this reporting period.
Basic Project
Information1.1. Background
The Acciona Agua, S.A. Trading, Jardine Engineering Corporation Limited and China State Construction Engineering (Hong Kong) Limited and as AJC Joint Venture (AJCJV) is contracted to carry out the Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (DPTKO) under Contract No. 13/WSD/17 (the Contract).
Acuity Sustainability Consulting Limited (ASCL) is commissioned by AJCJV to undertake the Environmental Team (ET) services as required and/or implied, both explicitly and implicitly, in the Environmental Permit (EP), Environmental Impact Assessment Report (EIA Report) (Register No. AEIAR-192/2015) and Environmental Monitoring and Audit Manual (EM&A Manual) for the Contract; and to carry out the Environmental Monitoring and Audit (EM&A) programme in fulfillment of the EIA Report’s EM&A requirements and Contract No. 13/WSD/17 Specification requirements.
Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-01/503/2015) and Variation of Environmental Permit (No. EP-01/503/2015/B) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/B) to AJCJV for the Contract.
1.2.
The Reporting Scope
This is the 18th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 June 2024 to 31 August 2024.
1.3. Project Organization
The Project Organization structure for Construction Phase is presented in Figure 1.1.
Figure 1.1 Project Organization Chart
Contact details of the key personnel are presented in Table 1.1 below:
Table 1.1 Contact Details
of Key Personnel
|
Party |
Position |
Name |
Telephone no. |
Remark |
|
Project Proponent |
SE/CM2 |
Milton Law |
2634-3573 |
/ |
|
Supervising Officer (Binnies Hong Kong Limited) |
Project Manager |
Augustine Li |
2608-7671 |
/ |
|
Senior Resident Engineer |
David Wong |
5229-8638 |
/ |
|
|
Chief Resident Engineer |
Roger Wu |
6343-1002 |
/ |
|
|
The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua, S.A. Trading |
Project Manager |
Stephen Yeung |
2807-4665 |
/ |
|
Environmental Monitoring Manager |
Brian Kam |
9456-9541 |
/ |
|
|
Operation Manager |
Arnes Parra, Victor |
6468-6710 |
/ |
|
|
Environmental Monitoring Manager |
Tommy Law |
6468-1782 |
/ |
|
|
Aurecon Hong Kong
Limited |
Environmental Team Leader |
Toby Wan |
9719-5422 |
/ |
|
Lam Environmental Services Limited |
Independent Environmental Checker (IEC) |
Serena Shek |
6149-6683 |
/ |
1.4. Summary of Construction Works
Details of the major construction activities undertaken in this reporting period are shown as below. The construction programme is presented in Appendix A.
|
Administration Building - Carrying out the floor tiles works at G/F - External wall painting works - Construction of block work for pipe duct - Installation of building services, cable laying, electrical switchboard, testing and commissioning |
|
- Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; - Minor Installation of building services, minor cables laying and termination. T&C |
|
Chemical building - Installation of leakage collection pit cover - Underground utility construction work - Landscape work at roof - Defect rectification |
|
Main Electrical & Central Chiller Plant Building - Installation of chillers, building services, electrical switchboard and cable laying - Installation of Roof Tile for Fuel Tank Room |
|
ActiDAFF - Underground utility construction work - Installation of access opening cover - Construction of staircase no 2 - Installation of mechanical equipment, piping system, installation of building services, electrical switchboards and cable laying, fiber-reinforced plastic cover Installation |
|
Product Water Storage Tank Building - Installation of Cat Ladders in Water Tank A - Sealing slab opening in water Tank A - Re-construction of Wall PW8 in Water Tank A -
Installation of metal
cladding, building
services, cable laying, mechanical equipment, steel pipe - Underground utility construction |
|
OSCG Building - Protective Coating for dangerous goods Rooms - Placing Soil Mix at Roof - Installation of Metal Cladding (at East Side) and Roller Shutters and Window - Underground utility construction work - Installation of building services, mechanical equipment and cable laying, testing and commissioning |
|
Reverse Osmosis Building - Installation of building services, electrical switchboard, cable laying, Installation of mechanical equipment, steel pipe, Glass Reinforced Plastic pipe, raised floor, testing and commissioning - Installation of metal cladding, handrailing, roller shutters, glass canopy and glass house - Underground utility construction work - Construction of Reinforced Concrete External Wall for Male Toilet |
|
Post Treatment Building - Installation of building services, Installation of mechanical equipment and piping system, Pressure Test - Underground utility construction work - Installation of Cat Ladders in Water Tanks - Installation of Metal Cladding - Placing Soil Mix at Roof |
|
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
|
Inspection corridor - Installation of building services, Lift installation - Construction of roof tiling works and staircases no. 2 - Installation of Movement Joints and glass window |
|
CO2 Tanks - Installation of pipes and electrical wiring, testing and commissioning Combined Shaft and Pump room - Finishing, Grating; window; louvre installation - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Other - Watermain works at CLP 132 kV Substation - Staircases construction; Steel Bridge assembly and installation at elevated walkway - Road Construction, Footpath Construction, Landscape Construction, Irrigation System Construction, Water Pressure Test for Fire Services and Plumbing System in Zone A, B, C - Structure Construction, steel fence erection of Wave Deflector Wall at seawall area |
|
- Slope work* |
*Remark: No site activity for the slope works from 4 May 2024 to 25 August 2024.
1.5.
Summary of Environmental Status
A summary of the valid permits, licences, and /or notifications on environmental protection for this Project is presented in Table 1.2.
Table 1.2 Summary of the Status
of Valid Environmental Licence, Notification, Permit
and Documentations
|
Permit/ Licences |
Valid Period |
Status |
Remark |
|
|
From |
To |
|||
|
Environmental Permit |
||||
|
EP - 503/2015/B |
Throughout the Contract |
Valid |
-Issued on 3 April 2024 |
|
|
FEP - 01/503/2015/B |
Throughout the Contract |
Valid |
-Issued on 3 April 2024 |
|
|
Notification of Construction Works under the Air Pollution Control (Construction Dust)
Regulation (Form NA) |
||||
|
451539 |
Throughout the Contract |
Valid |
- |
|
|
Billing Account for Disposal of Construction Waste |
||||
|
7036276 |
Throughout the Contract |
Valid |
- |
|
|
Sludge (Special Waste) Disposal (Admission Ticket) |
||||
|
17674 |
04/01/2024 |
30/06/2024 |
Valid |
- |
|
17913 |
01/07/2024 |
24/12/2024 |
Valid |
- |
|
Chemical Waste
Producer Registration |
||||
|
5213-839-A2987-01 |
Throughout the Contract |
Valid |
- |
|
|
Wastewater Discharge Licence (Land and Marine
works) |
||||
|
WT00035775-2020 |
23/08/2021 |
31/07/2025 |
Valid |
- |
|
WT00044188-2023 |
16/06/2023 |
30/06/2028 |
Valid |
- For Plant T&C and operation. - Variation of sampling point S.P.1 is approved by the EPD on 25 June 2024. (EPD ref.: EP640/W3/D1358/462874). |
|
Construction Noise
Permit |
||||
|
GW-RE1514-23 |
22/12/2023 |
21/06/2024 |
Valid |
- |
|
GW-RE0667-24 |
22/06/2024 |
20/12/2024 |
Valid |
- |
The status
for all environmental aspects is presented in Table 1.3
Table 1.3 Summary of Status for Key Environmental Aspects under the EM&A Manual
|
Parameters |
Status |
|
Water Quality |
|
|
Baseline Monitoring under EM&A Manual |
The baseline water quality monitoring was conducted between 12 May 2020 and 6 June 2020 |
|
Construction Phase Impact Monitoring |
Ceased from 1 September 2023 |
|
TRC Monitoring for Main Disinfection |
Completed |
|
Operation Phase Impact Monitoring |
On-going |
|
Continuous Monitoring of Effluent Quality |
On-going |
|
Noise |
|
|
Baseline Monitoring |
The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4 |
|
Impact Monitoring |
Completed |
|
Waste Management |
|
|
Mitigation Measures in Waste Management Plan |
On-going |
|
Landfill Gas |
|
|
Regular Monitoring when Construction Works are within the 250m Consultation Zone |
In this reporting period, 171 times of Construction Phase landfill gas
monitoring were recorded at Wan Po Road (Ch0+390 - Ch0+780) and (Ch0+400 - Ch1+200). No exceedance of action or limit level for methane, oxygen and carbon dioxide was observed. In this reporting period, Operation Phase landfill gas monitoring was conducted on 18, 19 July and 16, 17 August 2024. No exceedances of action level and limit level was observed. |
|
Ecology (Coral) |
|
|
Operation phase Regular Coral Monitoring (Monthly) |
Pre-operation phase
coral monitoring works
was conducted on 17 June 2024. Operation phase coral monitoring works was conducted on 18 July 2024 and 21 August 2024. There is no AL/LL exceedance during the monitoring period. |
|
Ecology (Fishery) |
|
|
Operation phase Regular Fishery Monitoring (Seasonally) |
Pre-operation phase
fishery monitoring for
dry season 2024 was carried out on 17
and 24 February 2024. |
|
Parameters |
Status |
|
|
Operation phase
fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024. |
|
Ecology (Landscape) |
|
|
Operation phase Landscape and Visual Site Inspection |
On-going |
|
Environmental Audit |
|
|
Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual |
On-going |
Other than the EM&A work by ET, environmental briefings, trainings and regular environmental management meetings were conducted, in order to enhance environmental awareness and closely monitor the environmental performance of the contractors.
The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the EM&A Manual. A summary of implementation status of the environmental mitigation measures for the construction phase, pre-operation phase and operation phase of the Project during the reporting period is provided in Appendix C.
Noise2.1. Monitoring Requirements
To ensure no adverse noise impact, construction noise monitoring is recommended to be carried out within 300m radius from the nearby noise sensitive receivers (NSRs), during construction phase. The NSRs selected as monitoring station are (i) NSR4 - Creative Secondary School, (ii) NSR24 - PLK Laws Foundation College, and (iii) NSR31 - School of Continuing and Professional Studies - CUHK respectively.
No impact construction noise monitoring was conducted in the reporting period due to the overly distant monitoring station from the works location, where they were farther than 1 km from the closet monitoring station NSR4 to the works location.
2.2.
Monitoring Parameters, Frequency and Duration
Construction noise level would be measured in terms of the A-weighted equivalent continuous sound pressure level (LAeq). Leq 30min was used as the monitoring parameter for the time period between 0700 and 1900 on normal weekdays. Table 2.1 summarizes the monitoring parameters, frequency and duration of the impact noise monitoring.
Table 2.1 Noise Monitoring Parameters, Time, Frequency
and Duration
|
Time |
Duration |
Interval |
Parameters |
|
Daytime: 0700-1900 |
Day time: 0700-1900 (during normal weekdays) |
Continuously in Leq 5min/Leq 30min (average of 6 consecutive Leq 5min) |
Leq 30min L10 30min & L90 30min |
2.3. Monitoring Locations
The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.
According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 below.
Table 2.2 Noise Sensitive
Receivers
|
NSR ID |
Noise Sensitive Receivers |
Monitoring Location |
Position |
|
NSR 4 |
Creative Secondary School |
Roof Floor |
1 m from facade |
|
NSR 24 |
PLK Laws Foundation College |
Pedestrian Road on Ground
Floor |
Free-field |
|
NSR 31 |
School of Continuing and Professional
Studies - CUHK |
Roof Floor |
1 m from facade |
The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements. Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.
|
|
|
Figure 2.1 NSR4
Creative Secondary School |
|
|
|
Figure 2.2 NSR24
PLK Laws Foundation College |
|
|
|
Figure 2.3 NSR31 School
of Continuing and Professional Studies - CUHK |
2.4. Action and Limit Levels
The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities - Non-statutory Controls” and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 are presented in Table 2.3.
Table 2.3 Action and Limit Levels
for Construction Noise
Monitoring per EM&A
Manual
|
Time Period |
Action Level |
Limit Level (dB(A)) |
|
0700-1900 on normal weekdays |
When one documented complaint is received from any one of the noise sensitive receivers |
- 70 dB(A) for school and - 65 dB(A) during examination period |
Notes: Limits specified in the GW-TM
and IND-TM for construction and operation noise,
respectively.
If exceedances were found during noise monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix E.
2.5.
Monitoring Results and Observations
Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. As no Contract-related construction activities were undertaken in the reporting period within a radius of 300m from the monitoring stations of the Project site as shown in Figure 2.4, no impact noise monitoring was conducted in the reporting period.
Figure 2.4 Site Layout
Plan with Noise Sensitive Receivers and Desalination Plant
In accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. In addition, baseline water quality monitoring was conducted prior to the commencement of marine construction activities.
The following Section provides details of the water quality monitoring to be undertaken by the Environmental Team (ET) to verify the distance of sediment and brine plume dispersion and to identify whether the potential exists for any indirect impacts to occur to ecological sensitive receivers. The water quality monitoring programme was carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.
Water quality monitoring for the Project can be divided into the following stages:
- Dredging activities during construction phase;
- Discharge of effluent from main disinfection during construction phase;
- Commissioning activities during pre-operation (testing and commissioning) phase
- Operation phase - first year upon operation; and,
- Continuous monitoring of effluent quality.
3.1. Water Quality
Parameters
Parameters to be measured in the marine water quality monitoring and the Continuous Monitoring of Effluent Quality are listed in Table 3.1 and Table 3.2 respectively.
a) Pre-Operation and Operation phase Marine Water Quality Monitoring
The parameters that have been selected for measurement in situ and in the laboratory are those that were either determined in the EIA
to be those with the most potential to be affected by the construction works or are a standard
check on water quality conditions. Parameters measured in the impact monitoring are listed in Table 3.1
Table 3.1 Parameters
measured in the impact marine water quality monitoring
|
Parameters |
Unit |
Abbreviation |
|
In-situ measurements |
||
|
Dissolved oxygen |
mg/L |
DO |
|
Temperature |
oC |
- |
|
pH |
pH |
- |
|
Turbidity |
NTU |
- |
|
Salinity |
0/00 |
- |
|
Total Residual Chlorine |
mg/L |
TRC |
|
Total Residual Chlorine (Disinfection) |
mg/L |
TRC |
|
Laboratory measurements |
||
|
Suspended Solids |
mg/L |
SS |
|
Iron |
mg/L |
|
|
Anti-scalant |
mg/L |
- |
NOTE 1: Monitoring of Total Residual
Chlorine (Disinfection) will be conducted when cleaning and sterilization of the new freshwater
main is carried out.
b) Continuous Monitoring of Effluent Quality
The monitoring requirement for the continuous effluent quality monitoring shall be conducted in accordance with the effluent parameters and standards stipulated by the Water Pollution Control Ordinance Discharge License (No.: WT00044188-2023) conditions.
Table 3.2 Parameters
measured in the Continuous Monitoring of Effluent Quality
|
Parameters |
Unit |
Abbreviation |
|
In-situ measurements |
||
|
Temperature |
oC |
- |
|
pH |
pH |
- |
|
Salinity |
0/00 |
- |
|
Total Residual Chlorine |
mg/L |
TRC |
|
Laboratory measurements |
||
|
Suspended Solids |
mg/L |
SS |
|
Iron-Soluble |
mg/L |
Fe |
|
Total Inorganic Nitrogen |
mg/L |
- |
|
Total Phosphorus |
mg/L |
- |
|
Sodium Metabisulphite |
mg/L |
SMBS |
|
Anti-scalant as Reactive Phosphorus * |
mg/L |
PO4 as P- |
*Remark: Anti-scalant water quality testing
will only be conducted whenever
anti-scalant
dosage is adopted.
In addition to the water quality parameters, other relevant data were measured and recorded in Water Quality Monitoring Logs, including the location of the sampling stations, water depth, time, weather conditions, sea conditions, tidal stage, current direction and velocity, special phenomena and work activities undertaken around the monitoring and works area that may influence the monitoring results.
3.2.
Monitoring Locations
a) Pre-Operation and Operation phase Marine Water Quality Monitoring
The impact water quality monitoring locations are detailed in Table 3.3 and shown in Figure 3.1 below.
Table 3.3 Location
of Impact Water Quality Monitoring Station
|
Station |
Easting |
Northing |
Description |
|
CE |
843550 |
815243 |
Upstream control station at ebb tide |
|
CF |
846843 |
810193 |
Upstream control station at flood tide |
|
WSR1 |
846864 |
812014 |
Ecological sensitive receiver at Tung Lung Chau |
|
WSR2 |
847645 |
812993 |
Fisheries sensitive receiver at Tung Lung Chau |
|
WSR3 |
848023 |
813262 |
Ecological sensitive receiver at Tung Lung Chau |
|
WSR4 |
847886 |
814154 |
Ecological sensitive receiver at Tai Miu Wan |
|
WSR16 |
845039 |
815287 |
Ecological sensitive receiver at Fat Tong Chau |
|
WSR33 |
847159 |
814488 |
Ecological sensitive receiver at Tai Miu Wan |
|
WSR36 |
846878 |
814081 |
Ecological sensitive receiver at Kwun Tsai |
|
WSR37 |
846655 |
813810 |
Ecological sensitive receiver at Tit Cham Chau |
|
NF1 |
846542 |
813614 |
Edge of mixing zone, ~ 200m west of outfall diffuser |
|
NF2 |
846942 |
813614 |
Edge of mixing zone, ~ 200m east of outfall diffuser |
|
NF3 |
846742 |
813414 |
Edge of mixing zone, ~ 200m south of outfall diffuser |
Figure 3.1 Impact Water Quality Monitoring
Locations under EM&A Manual
b) Continuous Monitoring of Effluent Quality
In accordance with the discharge license, the Continuous Monitoring shall be sampling at Brine Outfall Shaft.
Figure 3.2 Continuous
Monitoring locations
3.3. Monitoring Equipment, Methodology and QA/QC Procedures
The monitoring methodology, equipment used, and QA/QC procedures could be referred to Section 3.1.2 -3.1.4, 3.1.6-3.1.7 and 3.2 of the Monthly EM&A Report.
3.4.
Action and Limit
levels
The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual. The Action/Limit Levels have been derived and are presented in Table 3.4 and Table 3.5.
a) Pre-Operation and Operation phase Marine Water Quality Monitoring
Table 3.4 Derived Action and Limit Levels for Water Quality
|
Parameters |
Action |
Limit |
|
Operation Phase
Monitoring |
||
|
DO in
mg/L |
Surface and
Middle |
Surface and
Middle |
|
|
7.30 mg L-1 |
4 mg L-1 |
|
|
Bottom |
Bottom |
|
|
7.31 mg L-1 |
2 mg L-1 |
|
|
Tung Lung Chau Fish
Culture Zone |
Tung Lung Chau Fish
Culture Zone |
|
|
5.1 mgL-1 or level at control station |
5.0 mgL-1 or level at control station |
|
|
(Whichever the lower) |
(Whichever the lower) |
|
Parameters |
Action |
Limit |
|
Operation Phase
Monitoring |
||
|
SS in mg/L
(Depth- averaged) |
5.00 mg L-1 or 20% exceedance of value at any impact
station compared with corresponding data
from control station |
6.00 mg L-1 or 30% exceedance of value
at any impact station compared with corresponding data from control station |
|
Turbidity in NTU (Depth- averaged) |
2.41 NTU
or 20% exceedance of value at any impact station compared with corresponding data
from control station |
2.84 NTU or 30% exceedance of value at any impact station compared with corresponding data from control station |
|
Salinity in PSU (Depth- averaged) |
34.28 PSU or 9% exceedance of value at any impact station
compared with corresponding data from control station |
34.60 PSU or 10% exceedance of value at any impact
station compared with corresponding data
from control station |
|
Iron in mg/L (Depth- averaged) |
0.3 mg/L |
0.3 mg/L |
|
Total residual chlorine in mg/L |
0.01 mg/L |
0.01 mg/L |
|
Total residual chlorine in mg/L (Disinfection) |
0.1 mg/L |
0.1 mg/L |
Notes:
i.
"Depth-averaged" is calculated by taking the arithmetic means
of reading of all three
depths.
ii.
For DO, non-compliance of the water quality limits
occurs when monitoring result is lower than the limits.
iii.
For Turbidity, SS, iron and Salinity, non-compliance of the water quality limits
occurs when monitoring result is higher than
the limits.
b) Continuous Monitoring of Effluent Quality
Table 3.5 Derived Limit Levels for Water Quality
|
Parameters |
Limit |
|
Continuous Monitoring of Effluent Quality |
|
|
Flow Rate
in m3/day |
216841 |
|
Temperature in °C |
Maximum 40 |
|
Salinity |
71347 |
|
SS in mg/L |
13 |
|
pH |
6-9 |
|
Iron in
mg/L |
0.6 |
|
Total residual chlorine in mg/L |
0.1 |
|
Total Inorganic Nitrogen in mg/L |
2 |
|
Total Phosphorous in mg/L |
1 |
|
Parameters |
Limit |
|
Continuous Monitoring of Effluent Quality |
|
|
Sodium Metabisulphite in mg/L |
0.5 |
|
Anti scalant in mg/L* |
2.2 |
*Remark:
1. Anti-scalant water quality
testing will only be conducted whenever anti-scalant dosage is adopted.
3.5. Monitoring Results
and Observations
Construction Phase
Referring to EM&A Manual, the general water quality monitoring should be carried out when there are marine-related construction activities undertaken. General water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) was ceased from 1 September 2023 due to the completion of marine-related construction works.
Pre-Operation and Operation Phase
Considering the Operation phase of Tseung Kwan O Desalination Plant was started in the reporting period, marine water quality monitoring was conducted at the thirteen monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37, NF1, NF2 and NF3). The Action and Limit Level would be referred to the approved EM&A Manual Table 5.4 First-year Operation Phase Marine Water Monitoring.
The pre-operation phase marine water quality monitoring
was conducted on 4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27 and 29 June 2024. The operation
phase marine water quality monitoring was conducted on 2, 4, 6, 8, 10, 13, 16, 18, 20, 22, 24, 27 and 30 July 2024 and 1, 3, 5, 7, 10, 13, 15, 17, 19,
21, 24, 27, 29 and 31 August 2024. The result of the reporting quarterly is presented in Table
3.6.
Six (6) of the pre-operation phase marine water quality monitoring results of SS obtained had exceeded the Action Level. Twenty-three (23) of the pre-operation phase water quality monitoring results of SS obtained during the reporting period had exceeded the Limit Level.
Thirty (30) of
