REVISION HISTORY

REV.	DESCRIPTION OF MODIFICATION	DATE
1.	1st Issue	7/11/2025
2.	2nd Issue	18/6/2026
3.	3rd Issue	18/7/2026

CONTENTS

Executive Summary ................................................................................................................................................................ 1

Basic Project Information ........................................................................................................................................... 6

Noise ................................................................................................................................................................................. 11

Water Quality ................................................................................................................................................................ 15

Waste ............................................................................................................................................................................... 27

Landfill Gas Monitoring ............................................................................................................................................ 28

Summary of Exceedance, Complaint, Notification of Summons and Prosecutions ......................... 32

EM&A Site Inspection ................................................................................................................................................ 34

Conclusions and Recommendations ................................................................................................................... 35

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

EXECUTIVE SUMMARY

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 20th 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 December 2024 to 28 February 2025.

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:

• Potable Water Production

A7. During this reporting period, no major construction activities were undertaken under the Contract.

A8. The key environmental mitigation measures implemented for the Contract in this reporting period include:

• Regularly monitoring of the effluent quality • Sorting and storage of general refuse and operation waste

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, 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) ceased from 1 September 2023 due to the completion of marine- related construction works.

A11. The operation phase water quality was conducted from 1 December 2024 to 28 February 2025. Forty-one (41) of the operation phase water quality monitoring results of SS obtained had exceeded the Action Level. Sixty-eight (68) 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 December 2024 to 28 February 2025 in accordance with the EM&A Manual. No exceedance of the sampling was obtained during the reporting period had exceeded the Limit Level.

A13. According to the Contractors, all pits or trenches were backfilled and undergo reinstatement.

No landfill gas monitoring was carried out. The construction phase landfill gas monitoring was ceased from 31 October 2024.

A14. In this reporting period, Operation Phase landfill gas monitoring was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February respectively. No exceedances of action level and limit level was observed.

A15. Due to the suspension of production at the plant, there was no effluent discharge from the TKODP during the periods listed below:

• From 12 a.m. on 1 December 2024 to 10 a.m. on 5 December 2024 • From 10 p.m. on 5 December 2024 to 10 a.m. on 6 December 2024 • From 10 p.m. on 9 December 2024 to 10 a.m. on 10 December 2024 • From 10 p.m. on 10 December 2024 to 10 a.m. on 11 December 2024 • From 10 p.m. on 16 December 2024 to 10 a.m. on 23 December 2024 • From 8 p.m. on 23 December 2024 to 2 p.m. on 27 December 2024 • From 9 p.m. on 8 January 2025 to 11 p.m. on 8 January 2025 • From 10 a.m. on 13 January 2025 to 8 a.m. on 14 January 2025 • From 8 a.m. on 16 January 2025 to 12 a.m. on 16 January 2025 • From 6 p.m. on 24 January 2025 to 10 a.m. on 27 January 2025 • From 3 p.m. on 2 February 2025 to 5 p.m. on 2 February 2025 • From 10 p.m. on 8 February 2025 to 10 a.m. on 10 February 2025 • From 11 a.m. on 11 February 2025 to 12 p.m. on 12 February 2025 • From 6 a.m. on 14 February 2025 to 8 a.m. on 14 February 2025 • From 12 p.m. on 15 February 2025 to 10 a.m. on 17 February 2025 • From 3 p.m. on 27 February 2025 to 5 a.m. on 27 February 2025 Therefore, the effluent sampling was suspended on 1, 2, 3, 4, 17, 18, 19, 20, 22, 24, 25

and 26 December 2024, 13, 14, 25 and 26 January 2025, 9, 11, 15 and 16 February 2025 respectively.

A16. Operation phase monthly coral monitoring was conducted during the reporting period on 18 December 2024, 20 January 2025 and 20 February 2025 respectively. There is no AL/LL exceedance during the monitoring period.

A17. Operation phase fishery monitoring for dry season 2025 was carried out on 15 and 19 March 2025. The details of the monitoring were presented in the 11th Operation Phase Monthly EM&A Report.

A18. Total thirteen (13) Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. Three (3) Joint site inspections were carried out by ET and IEC during the reporting period.

A19. 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	Dec 2024	Jan 2025	Feb 2025
Noise Monitoring	N/A	N/A	N/A
Water Quality Monitoring	3, 5, 7, 10, 12, 14, 17, 19, 21, 24, 26, 28 and 31 December 2024	2, 4, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28 and 30 January 2025	1, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25 and 27 February 2025
TRC Monitoring for Main Disinfection	N/A	N/A	N/A
Coral Monitoring	18 December 2024	20 January 2025	20 February 2025
Fishery Monitoring	N/A	N/A	N/A
Landfill Gas Monitoring (Construction Phase)	N/A	N/A	N/A
Landfill Gas Monitoring (Operation Phase)	10 and 11 December 2024	8 and 9 January 2025	13 and 14 February 2025
Environmental Site Inspection	3, 10, 18, 23 and 31 December 2024	7, 14, 21 and 27 January 2025	5, 11, 18 and 25 February 2025
Continuous Monitoring of Effluent Quality	From 1 to 31 December 2024	From 1 to 31 January 2025	From 1 to 28 February 2025

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	L eq (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	41	68	109	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	O 2	0	0	0	0	0	0
	CH 4	0	0	0	0	0	0
	CO 2	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	/	N/A	N/A	N/A	N/A	N/A	N/A

*Remark: Anti-scalant water quality testing will only be conducted whenever anti-scalant dosage is adopted.

COMPLAINT HANDLING AND PROSECUTION

A20. No environmental complaint was received during the reporting period. No notifications of summons or prosecution was received during the reporting period.

REPORTING CHANGE

A21. There was no change to be reported that may affect the on-going EM&A programme.

A22. 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. Detail of the construction phase monitoring have been presented in the relevant monthly EM&A reports.

BASIC PROJECT INFORMATION

1.1. 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 (TKODP) 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 20th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 December 2024 to 28 February 2025.

1.3. PROJECT ORGANIZATION

The Project Organization structure for Construction Phase is presented in Figure 1.1.

Figure 1.1

Project Organization Chart

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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	Christina Ko	2608-7302	Until December 2024
	Project Manager	Augustine Li	2608-7671	/
	Senior Resident Engineer	Mason Pau	6765-4131	On the position from January 2025
	Chief Resident Engineer	David Wong	5229-8638	On the position from August 2024 to January 2025
The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua, S.A. Trading	Project Manager	Stephen Yeung	2807-4665	Until December 2024
	Operation Manager / Project Manager	Arnes Parra, Victor	6468-6710	/
	Environmental Monitoring Manager	Brian Kam	9456-9541	/
	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

No major construction work activities undertaken in this reporting period for the Contract, therefore it is considered that no significant adverse environmental impacts are expected. The construction programme is presented in Appendix A.

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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)
17913	01/07/2024	31/12/2024	Valid	-
101428	01/01/2025	30/06/2025	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-RE0667-24	22/06/2024	20/12/2024	Valid	-

The status for all environmental aspects is presented in Table 1.3 Aurecon Hong Kong Limited

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, the plant was shut down from 7 a.m. to 7 p.m. on 3 November 2024. No effluent discharge from TKODP occurred during this period. Due to the plant has suspended production, there was no effluent discharge from the TKODP during the period between 24 November 2024 and 30 November 2024.
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
(Construction Phase) Regular Monitoring when Construction Works are within the 250m Consultation Zone	Construction Phase landfill gas monitoring were ceased from 31 October 2024.
(Operation Phase) Monthly Monitoring for buildings, manholes and utility pits within the Project Site and along the fresh water mains	In this reporting period, Operation Phase landfill gas monitoring was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February 2025 respectively. No exceedances of action level and limit level was observed.
Ecology (Coral)
Operation phase Regular Coral Monitoring (Monthly)	Operation phase coral monitoring works was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February 2025 respectively. There is no AL/LL exceedance during the monitoring period.
Ecology (Fishery)
Operation phase Regular Fishery Monitoring (Seasonally)	Operation phase fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024.

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Parameters	Status
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 and operation phase of the Project during the reporting period is provided in Appendix C.

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NOISE

2.1. 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 L /L (average of eq 5min eq 30min 6 consecutive L ) eq 5min	L eq30min L & L 1030min 9030min

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

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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

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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.

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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

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WATER QUALITY

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;

• 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) 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 operation works or are a standard check on water quality conditions. Parameters measured in the monitoring are listed in Table 3.1

Table 3.1

Parameters measured in the 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	-

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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) Operation phase Marine Water Quality Monitoring The water quality monitoring locations are detailed in Table 3.2 and shown in Figure 3.1 below.

Table 3.3

Location of 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

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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

NF3

846742

813414

Edge of mixing zone, ~ 200m south of outfall diffuser

Figure 3.1

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.

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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) 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 7.30 mg L-1 Bottom 7.31 mg L-1 Tung Lung Chau Fish Culture Zone 5.1 mgL-1 or level at control station (Whichever the lower)	Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone 5.0 mgL-1 or level at control station (Whichever the lower)

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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

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

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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.

Operation Phase

The first-year operation phase marine water quality monitoring was carried out during the reporting period, the 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 operation phase marine water quality monitoring was conducted 3, 5, 7, 10, 12, 14, 17, 19, 21, 24, 26, 28 and 31 December 2024, 2, 4, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28 and 30 January 2025 and 1, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25 and 27 February 2025. The result of the reporting quarterly is presented in Table 3.6. Details of water quality monitoring graphics were presented in Appendix D.

Forty-one (41) of the operation phase marine water quality monitoring results of SS obtained had exceeded the Action Level. Sixty-eight (68) of the operation phase water quality monitoring results of SS obtained during the reporting period had exceeded the Limit Level.

Investigation on the reason of exceedance has been carried out, where the exceedances of SS were concluded to be unrelated to the Contract as detailed in the Incident Reports on Action Level or Limit Level. Summary of the exceedance is presented in Appendix E.

Continuous Monitoring of Effluent Quality Continuous Monitoring of Effluent Quality was conducted sampling point in the reporting period.

No exceedance of the sampling was obtained during the reporting period had exceeded the Limit Level. The detailed results are summarized in Table 3.7.

Due to the suspension of production at the plant, there was no effluent discharge from the TKODP during the periods listed below:

• From 12 a.m. on 1 December 2024 to 10 a.m. on 5 December 2024 • From 10 p.m. on 5 December 2024 to 10 a.m. on 6 December 2024

Aurecon Hong Kong Limited

• From 10 p.m. on 9 December 2024 to 10 a.m. on 10 December 2024 • From 10 p.m. on 10 December 2024 to 10 a.m. on 11 December 2024 • From 10 p.m. on 16 December 2024 to 10 a.m. on 23 December 2024 • From 8 p.m. on 23 December 2024 to 2 p.m. on 27 December 2024 • From 9 p.m. on 8 January 2025 to 11 p.m. on 8 January 2025 • From 10 a.m. on 13 January 2025 to 8 a.m. on 14 January 2025 • From 8 a.m. on 16 January 2025 to 12 a.m. on 16 January 2025 • From 6 p.m. on 24 January 2025 to 10 a.m. on 27 January 2025 • From 3 p.m. on 2 February 2025 to 5 p.m. on 2 February 2025 • From 10 p.m. on 8 February 2025 to 10 a.m. on 10 February 2025 • From 11 a.m. on 11 February 2025 to 12 p.m. on 12 February 2025 • From 6 a.m. on 14 February 2025 to 8 a.m. on 14 February 2025 • From 12 p.m. on 15 February 2025 to 10 a.m. on 17 February 2025 • From 3 p.m. on 27 February 2025 to 5 a.m. on 27 February 2025 Therefore, the effluent sampling was suspended on 1, 2, 3, 4, 17, 18, 19, 20, 22, 24, 25 and 26 December 2024, 13, 14, 25 and 26 January 2025, 9, 11, 15 and 16 February 2025 respectively.

Aurecon Hong Kong Limited

Quarterly EM&A Report No.20

Table 3.6

Summary of Operation Phase Water Quality Monitoring Results

Location		Parameter
		Salinity (ppt)			Dissolved Oxygen (mg/L)						pH			Turbidity (NTU)			Suspended Solids (mg/L)			Temp. (oC)			TRC (mg/L)			Iron (mg/L)
					Surface & Middle			Bottom
		Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025
CE	Avg.	31.92	31.90	31.78	8.54	8.97	8.77	8.55	8.98	8.76	8.20	8.22	8.16	2.41	2.33	2.26	3.76	3.28	3.19	21.45	21.24	21.15	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.53	30.44	31.14	7.79	8.41	8.18	7.84	8.38	8.15	8.05	8.03	8.01	1.99	1.70	2.04	2.50	2.50	2.38	20.90	20.84	20.87	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.61	32.62	33.21	9.49	9.22	9.33	9.47	9.30	9.28	8.37	8.39	8.29	2.61	2.64	2.46	7.00	8.00	7.00	22.24	21.66	21.62	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
CF	Avg.	31.91	31.79	31.67	8.77	8.82	8.92	8.76	8.83	8.93	8.19	8.22	8.14	2.40	2.52	2.41	4.06	3.28	3.14	21.53	21.24	21.16	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.86	31.01	30.77	7.95	7.97	8.30	7.96	7.94	8.35	7.94	8.05	7.98	2.02	1.89	2.17	2.50	2.50	2.27	20.98	20.89	20.76	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	33.24	32.71	32.92	9.38	9.36	9.33	9.34	9.39	9.34	8.34	8.38	8.26	2.73	2.85	2.72	9.00	6.00	6.00	22.16	21.70	21.40	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR1	Avg.	31.95	31.69	31.63	8.71	8.71	8.78	8.73	8.74	8.78	8.12	8.18	8.15	1.81	1.69	1.86	4.22	3.60	3.52	21.53	21.29	21.13	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.99	30.59	30.72	7.95	8.13	8.28	7.97	8.05	8.26	7.94	8.02	8.04	1.20	1.25	1.52	2.50	2.50	2.05	21.04	21.04	20.73	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.92	32.62	32.35	9.25	9.41	9.51	9.33	9.46	9.47	8.34	8.37	8.28	2.19	2.24	2.19	8.00	9.00	12.00	22.30	21.70	21.44	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR2	Avg.	31.80	31.91	31.76	8.64	8.68	8.68	8.63	8.69	8.69	8.21	8.20	8.18	1.80	1.75	1.80	4.29	3.54	3.14	21.56	21.29	21.18	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.53	30.89	30.78	8.10	8.16	8.04	8.08	8.10	8.07	8.05	8.05	8.09	1.29	1.09	1.42	2.50	2.50	2.00	20.94	20.81	20.76	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.78	32.79	33.07	9.09	9.19	9.33	9.08	9.19	9.27	8.37	8.41	8.32	2.17	2.29	2.09	13.00	11.00	6.00	22.41	21.76	21.64	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR3	Avg.	31.87	31.95	31.72	8.73	8.64	8.76	8.71	8.66	8.75	8.16	8.24	8.19	1.69	1.79	1.74	4.04	3.55	3.10	21.49	21.23	21.18	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.91	30.84	30.85	8.29	8.25	8.28	8.30	8.28	8.29	7.97	8.08	8.06	1.29	1.41	1.52	2.50	2.50	1.68	20.97	20.85	20.81	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.87	32.66	32.48	9.23	9.01	9.36	9.22	8.96	9.35	8.36	8.37	8.37	2.17	2.15	2.19	8.00	8.00	6.00	22.24	21.59	21.54	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR4	Avg.	31.69	32.01	31.77	8.51	8.58	8.81	8.50	8.60	8.83	8.19	8.17	8.15	1.73	1.81	1.71	4.35	3.60	3.41	21.57	21.26	21.13	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.65	31.46	30.79	8.09	8.16	8.27	8.01	8.12	8.28	8.02	8.04	7.98	1.30	1.26	1.40	2.50	2.50	1.92	20.92	20.88	20.65	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.68	32.67	32.92	9.18	9.10	9.37	9.12	9.13	9.47	8.36	8.28	8.33	2.10	2.23	2.09	9.00	8.00	7.00	22.37	21.69	21.64	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR16	Avg.	31.77	31.76	31.78	8.48	8.96	8.83	8.49	8.96	8.85	8.16	8.21	8.17	1.76	1.79	1.74	3.94	3.38	3.33	21.49	21.20	21.12	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	31.09	30.97	31.00	8.02	8.09	8.12	8.05	8.04	8.10	7.91	8.02	7.98	1.19	1.40	1.56	2.50	2.50	1.78	20.91	20.79	20.61	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.66	33.08	32.64	9.15	9.43	9.68	9.22	9.35	9.64	8.33	8.42	8.29	2.22	2.17	2.01	8.00	8.00	8.00	22.06	21.44	21.40	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR33	Avg.	32.03	32.02	31.66	8.74	8.70	8.79	8.74	8.71	8.80	8.15	8.23	8.14	1.72	1.75	1.75	4.18	3.28	2.91	21.57	21.23	21.06	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	31.18	30.89	30.76	8.08	8.22	8.21	8.03	8.24	8.25	7.99	8.12	7.97	1.34	1.44	1.51	2.50	2.50	1.58	21.10	20.83	20.80	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	33.04	32.95	32.58	9.28	9.13	9.34	9.32	9.15	9.37	8.38	8.42	8.36	1.98	2.21	2.19	8.00	9.00	6.00	22.22	21.74	21.42	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR36	Avg.	31.85	32.11	32.05	8.50	8.61	8.82	8.49	8.59	8.82	8.15	8.18	8.17	1.70	1.71	1.85	3.78	3.56	3.29	21.52	21.26	21.17	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.75	31.47	31.29	7.83	8.02	8.39	7.82	8.01	8.43	7.99	8.03	8.07	1.26	1.21	1.56	2.50	2.50	1.76	20.97	20.76	20.55	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	33.15	32.93	33.21	9.21	9.30	9.21	9.19	9.22	9.25	8.35	8.40	8.34	2.19	2.07	2.19	8.00	7.00	8.00	22.11	21.80	21.43	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
WSR37	Avg.	32.02	31.77	31.75	8.70	8.54	8.83	8.70	8.54	8.83	8.15	8.19	8.17	1.75	1.77	1.81	4.33	3.61	3.49	21.50	21.31	21.18	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	31.04	30.95	30.87	7.99	8.13	8.22	7.97	8.11	8.21	7.93	8.02	8.03	1.29	1.51	1.50	2.50	2.50	1.91	20.86	20.89	20.85	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.71	32.56	32.88	9.24	8.91	9.74	9.28	8.96	9.69	8.25	8.34	8.28	2.05	2.16	2.12	10.00	7.00	8.00	22.16	21.72	21.53	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1

Quarterly EM&A Report No.20

Location		Parameter
		Salinity (ppt)			Dissolved Oxygen (mg/L)						pH			Turbidity (NTU)			Suspended Solids (mg/L)			Temp. (oC)			TRC (mg/L)			Iron (mg/L)
					Surface & Middle			Bottom
		Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025	Dec- 2024	Jan- 2025	Feb- 2025
NF1	Avg.	31.88	31.91	31.89	8.65	8.66	8.95	8.64	8.65	8.97	8.14	8.22	8.14	1.64	1.75	1.81	4.42	3.21	2.82	21.53	21.23	21.11	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.52	31.37	30.87	8.16	8.17	8.29	8.09	8.09	8.35	7.91	8.02	7.99	1.14	1.37	1.50	2.50	2.50	0.40	21.01	20.81	20.84	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.78	32.83	32.53	9.12	9.23	9.63	9.16	9.26	9.63	8.34	8.46	8.29	2.06	2.18	2.15	9.00	9.00	6.00	22.20	21.68	21.54	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
NF2	Avg.	31.99	31.85	31.99	8.60	8.77	8.80	8.59	8.77	8.81	8.17	8.20	8.17	1.64	1.78	1.76	4.30	3.40	3.49	21.48	21.25	21.13	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.86	31.23	30.97	7.90	8.26	8.13	7.89	8.25	8.12	8.01	8.04	8.05	1.31	1.40	1.43	2.50	2.50	1.57	21.02	21.06	20.71	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	32.73	32.49	32.86	9.19	9.41	9.47	9.19	9.37	9.39	8.39	8.37	8.35	2.11	2.09	2.15	9.00	18.00	8.00	22.13	21.83	21.43	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
NF3	Avg.	31.95	31.83	31.83	8.72	8.83	8.92	8.72	8.83	8.94	8.17	8.24	8.12	1.73	1.84	1.87	4.11	3.47	3.14	21.41	21.28	21.14	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Min.	30.58	30.73	30.70	7.77	8.38	8.00	7.83	8.40	8.07	7.93	8.05	7.98	1.31	1.41	1.48	2.50	2.50	1.91	20.84	20.93	20.61	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1
	Max..	33.07	32.61	33.05	9.38	9.49	9.40	9.39	9.45	9.46	8.40	8.43	8.28	2.12	2.25	2.14	8.00	7.00	8.00	22.30	21.79	21.38	<0.01	<0.01	<0.01	<0.1	<0.1	<0.1

Table 3.7

Summary of Continuous Effluent Monitoring Results

		Salinity (ppt)	pH	Temp (°C)	Total Residual Chlorine (mg/L)	Suspended Solids (mg/L)	Total Inorganic Nitrogen (mg/L)	Total Phosphorus (mg/L)	*Sodium Metabisulphite (mg/L)	Iron (mg/L)
Dec-2024	Avg.	46.00	7.74	20.59	0.01	2	0.14	0.01	<2	<0.1
	Min.	38.35	6.38	15.90	0.00	2	0.07	0.01	<2	<0.1
	Max.	55.05	8.24	27.42	0.06	2	0.19	0.03	<2	<0.1
Jan-2025	Avg.	50.41	8.02	18.04	0.02	2	0.18	0.01	<2	<0.1
	Min.	47.18	7.55	15.53	0.00	2	0.10	0.01	<2	<0.1
	Max.	54.51	8.20	20.26	0.05	2	0.26	0.01	<2	<0.1
Feb-2025	Avg.	31.75	8.17	21.18	0.02	2	0.40	0.02	<2	<0.1
	Min.	30.87	8.03	20.85	0.00	2	0.11	0.01	<2	<0.1
	Max.	32.88	8.28	21.53	0.05	2	0.22	0.012	<2	<0.1

* Remark: As confirmed by various laboratories in Hong Kong, the lowest detection limit for Sodium Metabisulphite is <2 mg/L. Due to the limitation of the laboratory, the lowest result for Sodium Metabisulphite will only be shown as < 2 mg/L.

Quarterly EM&A Report No.20

WASTE

The waste generated from this Project includes inert construction and demolition (C&D) materials, and non-inert C&D materials. Non-inert C&D materials are made up of general refuse, vegetative wastes, and recyclable wastes such as plastics and paper/cardboard packaging waste. Steel materials generated from the project are also grouped into non-inert C&D materials as the materials were not disposed of with other inert C&D materials. With reference to relevant handling records and trip tickets of this Project, the quantities of different types of waste generated in the reporting period are summarized in Table 4.1. Details of cumulative waste management data are presented as a waste flow table in Appendix F.

Table 4.1

Quantities of Waste Generated from the Project during reporting period

Reporting Months	Actual Quantities of Inert C&D Materials Generated Monthly						Actual Quantities of C&D Wastes Generated Monthly
	Total Quantity Generated	Hard Rock and Large Broken Concrete	Reused in the Contract	Reused in other Projects	Disposed as Public Fill	Imported Fill	Metals	Paper / cardboard packaging	Plastics (1)	Chemical Waste	Others, e.g. general refuse
	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)	(in ,000kg)
Dec 2024	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	1.000	31.47
Jan 2025	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	38.740
Feb 2025	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	0.000	18.330

Notes:

(1) Plastics refer to plastic bottles / containers, plastic sheets / foam from packaging material

LANDFILL GAS MONITORING

5.1. MONITORING REQUIREMENT

In accordance with Section 11 of the EM&A Manual, monitoring of landfill gas is required for construction works within the 250m Consultation Zone. Part of the desalination plant and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone; and part of the 1,200 mm diameter fresh water mains along Wan Po Road falls within the SENT Landfill and SENT Landfill Extension Consultation Zones, TKO Stage II/III Restored Landfill and TKO Stage I Restored Landfill Consultation Zones.

Routine monitoring is required at buildings within the Project Site and consultation zones. The monitoring frequency will be monthly for the first year of operation.

For the manholes and utility pits within the Project Site and along the fresh water mains, each manhole/ utility pit should be monitored with two measurements (at mid depth and base). Each measurement should be monitored for a minimum of 10 minutes. A steady reading and peak reading should be recorded at each manhole/ utility pit and for each measurement.

Monitoring of oxygen, methane, carbon dioxide and barometric pressure would be performed monthly during the operation phase.

5.2. MONITORING LOCATION

Monitoring of oxygen, methane, carbon dioxide and barometric pressure was performed for excavations at 1m depth or more within the consultation Zone.

During construction of works within the consultation zones, excavations of 1m depth or more was monitored:

• At the ground surface before excavation commences;

• Immediately before any worker enters the excavation;

• At the beginning of each working day for the entire period the excavation remains open; and

• Periodically through the working day whilst workers are in the excavation.

For excavations between 300mm and 1m deep, measurements should be carried out:

• Directly after the excavation has been completed; and

• Periodically whilst the excavation remains open.

5.3. MONITORING PARAMETERS

LFG monitoring was carried out to identify any migration between the landfill and the Project and to ensure the safety of the construction, operation and maintenance personnel working on- site, visitors and any other person within the Project area.

The following parameters were monitored:

• Methane.

• Oxygen.

• Carbon Dioxide.

• Barometric Pressure.

5.4. MONITORING LOCATION

The area required to be monitored for landfill gas in the reporting period is shown in Figure 5.1, 5.2 and 5.3.

Figure 5.1 Overview of the SENT Extension Consultation Zone and the Project Site Area

5.5. ACTION AND LIMIT LEVEL

Action and Limit Level are provided in Table 5.1.

Parameters	Action Level	Limit Level
Oxygen (O ) 2	<19% O 2	<19% O 2
Methane (CH ) 4	>10% LEL	>20% LEL
Carbon Dioxide (CO ) 2	>0.5% CO 2	>1.5% CO 2

5.6. MONITORING EQUIPMENT

The monitoring equipment used during the construction phase in this reporting period is detailed in Section 5.8 of the Construction Phase Monthly EM&A Report and the monitoring equipment used during the operation phase in the reporting period is detailed in Section 4.7 – 4.8 of the Operation Phase Monthly EM&A Report.

5.7. MONITORING RESULTS AND OBSERVATIONS

The Construction Phase landfill gas monitoring was ceased from 31 October 2024.

In this reporting period, Operation Phase landfill gas monitoring was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February 2025 respectively. No exceedances of action level and limit level was observed.

SUMMARY OF EXCEEDANCE, COMPLAINT, NOTIFICATION OF SUMMONS AND

PROSECUTIONS

The Environmental Complaint Handling Procedure is shown in below Figure 6.1:

Figure 6.1

Environmental Complaint Handling Procedures

No noise monitoring was conducted during the reporting period since there are no Contract- related construction activities undertaken within a radius of 300m from the monitoring locations.

No Action Level exceedance was recorded during the reporting period.

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.

Forty-one (41) of the operation phase water quality monitoring results of SS obtained had exceeded the Action Level. Sixty-eight (68) 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 considered non-project related.

Construction Phase landfill gas monitoring was ceased from 31 October 2024.

In this reporting period, Operation Phase landfill gas monitoring was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February 2025. No exceedances of action level and limit level was observed.

Operation phase monthly coral monitoring was conducted during the reporting period on 18 December 2024, 20 January 2025 and 20 February 2025 respectively. No sediment, bleaching or increased mortality in the general condition of all other tagged coral colonies were observed during the monthly operation phase monitoring period. No deterioration of the coral community was observed in the ecological monitoring results when compared with the baseline ecological monitoring results. There is no AL/LL exceedance during the monitoring period.

Operation phase fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024. The detail of the monitoring was presented in the 4th Operation Phase Monthly EM&A Report.

Continuous Monitoring of Effluent Quality was conducted sampling point from 1 December 2024 to 28 February 2025. No exceedance of the sampling was obtained during the reporting period had exceeded the Limit Level.

ET will keep closely monitoring the performance of Contractor, implementation of water quality mitigation measure and other contamination issue around the Project site, to ensure the EM&A requirement is properly implemented.

No environmental complaint was received in the reporting period. No notification of summons and prosecution was received in the reporting period.

Statistics on complaints and regulatory compliance are summarized in Appendix G.

EM&A SITE INSPECTION

Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract.

No trespass by the Contractor outside the works area of the Project and Clear Water Bay Country Park, and no damage to the vegetation and rocky shore outside the Project area was observed in the reporting period. All plants were observed to be in satisfactory condition in the reporting period.

ET weekly site inspections were carried out by ET on 3, 10, 18, 23 and 31 December 2024, 7, 14, 21 and 27 January 2025 and 5, 11, 18 and 25 February 2025.

Joint site inspections were also carried out by ET and IEC on 18 December 2024, 21 January 2025 and 25 February 2025.

EPD conducted a site visit on 12 December 2024, during which no comments were raised.

According to the EIA Study Report, Environmental Permit, contract documents and EM&A Manual, the mitigation measures detailed in the documents should be implemented as much as practical during the reporting period. An updated Implementation Status of Environmental Mitigation Measures (EMIS) is provided in Appendix C.

CONCLUSIONS AND RECOMMENDATIONS

This is the 20th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 December 2024 to 28 February 2025, in accordance with the EM&A Manual and the requirement under FEP-01/503/2015/B.

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.

No noise monitoring was conducted in the reporting period due to the over distant monitoring station from the works location.

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.

Forty-one (41) of the operation phase water quality monitoring results of SS obtained had exceeded the Action Level. Sixty-eight (68) 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 considered non-project related.

Continuous Monitoring of Effluent Quality was conducted sampling point 1 December 2024 to 28 February 2025. No exceedance of the sampling was obtained during the reporting period had exceeded the Limit Level.

Construction Phase landfill gas monitoring was ceased from 31 October 2024.

In this reporting period, Operation Phase landfill gas monitoring was conducted on 10 and 11 December 2024, 8 and 9 January 2025 and 13 and 14 February 2025. No exceedances of action level and limit level was observed.

Operation phase monthly coral monitoring was conducted during the reporting period on 18 December 2024, 20 January 2025 and 20 February 2025. No sediment, bleaching or increased mortality in the general condition of all other tagged coral colonies were observed during the monthly operation phase monitoring period. No deterioration of the coral community was observed in the ecological monitoring results when compared with the baseline ecological monitoring results. There is no AL/LL exceedance during the monitoring period.

Operation phase fishery monitoring for wet season 2024 was carried out on 24 and 31 August 2024. The detail of the monitoring was presented in the 4th Operation Phase Monthly EM&A Report.

Weekly environmental site inspection was conducted during the reporting period. The environmental performance of the project was therefore considered satisfactory.

No environmental complaint was received in the reporting period. No notification of summons or prosecution was received of the Contract since commencement of the Contract quarter.

The ET will keep track on the construction and operation works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

13/WSD/17

Design, Build and Operate Stage 1 of Tesung Kwan O Desalination Plant

31 Jul 24

ctivity ID

Activity Name

Baseline Duration

Baseline Start

Baseline Finish

Remaining Duration

Actual / Planned Start

Actual / Planned Finish

Actual % Complete

Variance Finish Date

Total Float

2020

2021

2022

2023

2024

N

D

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

A

S

O

N

D

J

F

M

A

M

J

J

A

S

O

N

D

Project Progr

amme Updated as at 31 Jul 2024

Le

tter C

of om

Acc me

ep nc

tan em

ce ent

of

the

W

ork

s

Key Dates

Commencem

ent and Completion Date

KD0000100

Letter of Acceptance

0

15-Nov-19

0

15-Nov-19 A

100%

0

KD0000110

Commencement of the Works

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000120

Original Completion of the Works (1170 Days)

0

13-Mar-23

0

13-Mar-23 A

100%

0

P

os

ses

sio

n of

Fir

st

Sta

ge

Por

tion

A

Ori

gin

al C

om

ple

tio

n of

th

e W

or

ks ( R

117 ev

0 ise

Day d C

s) om

ple P

tion lan

of ne

the d C

W om

ork ple

KD0000130

Revised Completion of the Works (324 Days EOT Granted)

0

0

14-Mar-23 A

31-Jan-24 A

100%

KD0000510

Planned Completion of the Works

0

0

30-Jun-24 A

100%

Possession

of Site

KD0000200

Possession of First Stage Portion A

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000210

Possession of First Stage Portion B

0

30-Dec-19

0

30-Dec-19 A

100%

0

P P P P P

os os os os os

ses ses ses ses ses

sio sio sio sio sio

n of n of n of n of n of

Fir Ar Te Te Te

st ea mp mp mp

Sta for ora ora ora

ge Acc ry ry ry

Por es Wo Wo Wo

tion s R rks rks rks

B oa Are Are Are

d a 1 a 2 a 3

KD0000220

Possession of Area for Access Road

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000230

Possession of Temporary Works Area 1

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000240

Possession of Temporary Works Area 2

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000250

Possession of Temporary Works Area 3

0

30-Dec-19

0

30-Dec-19 A

100%

0

KD0000260

Possession of Temporary Works in Clear Water Bay Country Park

0

30-Dec-19

0

30-Dec-19 A

100%

0

P

os

ses

sio

n of

Te

mp

ora

ry

Wo

rks

in

Cle

ar

Wa

ter

Ba

y C

ou

ntry

Pa

rk

Executive Su

mmaries

Preliminary S

etup

ES0001000

Mobilization and Preliminary Set Up

191

30-Dec-19

07-Jul-20

0

30-Dec-19 A

20-Jul-20 A

100%

-13

Civil Design

AIP and DDA

ES0001010

AIP Civil Design Submission and Approval

330

30-Dec-19

23-Nov-20

0

30-Dec-19 A

31-Aug-20 A

100%

84

ES0001020

DDA Civil Design Submission and Approval

414

28-Feb-20

16-Apr-21

0

22-Jan-20 A

01-Sep-21 A

100%

-138

M&E Design

AIP and DDA

ES0002000

M&E AIP Process Mechanical Submission and Approval

477

30-Dec-19

19-Apr-21

0

30-Dec-19 A

22-Dec-20 A

100%

118

ES0002010

M&E DDA Process Mechanical Submission and Approval

679

08-Feb-20

17-Dec-21

0

21-Jul-20 A

02-Sep-21 A

100%

106

ES0002020

M&E AIP Instrumentation & Control Submission and Approval

607

31-Jan-20

28-Sep-21

0

04-Feb-20 A

25-Feb-20 A

100%

581

ES0002030

M&E DDA Instrumentation & Control Submission and Approval

514

22-Jul-20

17-Dec-21

0

13-Feb-21 A

14-Apr-23 A

100%

-482

ES0002050

M&E DDA Renewable Energy Submission and Approval

382

16-Aug-20

01-Sep-21

0

17-Aug-20 A

31-Dec-20 A

100%

244

ES0002060

M&E AIP Building Services Submission and Approval

226

30-Dec-19

11-Aug-20

0

30-Dec-19 A

30-Oct-20 A

100%

-80

ES0002065

M&E Design Basis & Civil Guidance Dwg

112

30-Dec-19

19-Apr-20

0

30-Dec-19 A

24-Jul-20 A

100%

-96

ES0002070

M&E DDA Building Services Submission and Approval

306

28-Feb-20

29-Dec-20

0

01-Mar-20 A

30-Jun-21 A

100%

-183

ES0002085

M&E AIP Site Wide Electrical Submission and Approval

155

09-Jun-20

10-Nov-20

0

21-Mar-20 A

22-Jul-20 A

100%

111

ES0002090

M&E CMS Lift Submission and Approval

140

27-Aug-20

13-Jan-21

0

01-Oct-20 A

20-Jul-21 A

100%

-188

ES0002095

M&E DDA Site Wide Electrical Submission and Approval

140

11-Nov-20

30-Mar-21

0

23-Jul-20 A

04-Jun-21 A

100%

-66

ES0002100

M&E DDA T&C Design Submission and Approval

155

29-Mar-22

30-Aug-22

0

01-Aug-21 A

05-Oct-23 A

100%

-401

Procurement

of Major Plant & Equipment Schedule

ES0002320

M&E Procurement of Major Plant, Equipment, Material and Delivery

901

14-Mar-20

31-Aug-22

0

04-Feb-20 A

16-Jan-23 A

100%

-137

ES2420

M&E Procurement of Mechanical Equipment - Intake Pumps

595

18-May-20

02-Jan-22

0

04-Feb-20 A

11-May-22 A

100%

-128

ES2430

M&E Procurement of Mechanical Equipment - ActiDAFF Underdrain

333

30-Oct-20

27-Sep-21

0

02-Aug-20 A

14-Mar-22 A

100%

-168

ES2440

M&E Procurement of Mechanical Equipment - ActiDAFF Media

298

15-Mar-21

06-Jan-22

0

23-Jul-20 A

14-Oct-22 A

100%

-281

ES2450

M&E Procurement of Mechanical Equipment - RO and ERD Rack

274

22-Feb-21

22-Nov-21

0

22-Jul-20 A

28-Dec-21 A

100%

-36

ES2460

M&E Procurement of Mechanical Equipment - RO Membrane

755

29-Mar-20

22-Apr-22

0

12-Feb-20 A

28-Dec-22 A

100%

-249

ES2470

M&E Procurement of Electrical Equipment - CLP Substation for LV Switchboard / Genset / Building Services

300

14-Mar-20

07-Jan-21

0

14-Mar-20 A

28-Feb-21 A

100%

-52

Summary Bar Actual Work Target Milestone Actual Level of Effort Early Bar Milestone Target Bar Critical Bar

Page 1 of 5 Appendix D - Critical Path file: MPR202407 c _

13/WSD/17

Design, Build and Operate Stage 1 of Tesung Kwan O Desalination Plant 31 Jul 24

ES0001020

DDA Civil Design Submission and Approval

28-Feb-20

16-Apr-21

22-Jan-20 A

01-Sep-21 A

100%

-138

ES0002030

M&E DDA Instrumentation & Control Submission and Approval

22-Jul-20

17-Dec-21

13-Feb-21 A

14-Apr-23 A

100%

-482

ES0002070

M&E DDA Building Services Submission and Approval

28-Feb-20

29-Dec-20

01-Mar-20 A

30-Jun-21 A

100%

-183

ES0002090

M&E CMS Lift Submission and Approval

27-Aug-20

13-Jan-21

01-Oct-20 A

20-Jul-21 A

100%

-188

ES0002100

M&E DDA T&C Design Submission and Approval

29-Mar-22

30-Aug-22

01-Aug-21 A

05-Oct-23 A

100%

-401

ES0002320

M&E Procurement of Major Plant, Equipment, Material and Delivery

14-Mar-20

31-Aug-22

04-Feb-20 A

16-Jan-23 A

100%

-137

ES2420

M&E Procurement of Mechanical Equipment - Intake Pumps

18-May-20

02-Jan-22

04-Feb-20 A

11-May-22 A

100%

-128

ES2430

M&E Procurement of Mechanical Equipment - ActiDAFF Underdrain

30-Oct-20

27-Sep-21

02-Aug-20 A

14-Mar-22 A

100%

-168

ES2440

M&E Procurement of Mechanical Equipment - ActiDAFF Media

15-Mar-21

06-Jan-22

23-Jul-20 A

14-Oct-22 A

100%

-281

ES2460

M&E Procurement of Mechanical Equipment - RO Membrane

29-Mar-20

22-Apr-22

12-Feb-20 A

28-Dec-22 A

100%

-249

ES0002010

M&E DDA Process Mechanical Submission and Approval

08-Feb-20

17-Dec-21

21-Jul-20 A

02-Sep-21 A

100%

106

ES0002020

M&E AIP Instrumentation & Control Submission and Approval

31-Jan-20

28-Sep-21

04-Feb-20 A

25-Feb-20 A

100%

581

ES0002050

M&E DDA Renewable Energy Submission and Approval

16-Aug-20

01-Sep-21

17-Aug-20 A

31-Dec-20 A

100%

244

ES0002085

M&E AIP Site Wide Electrical Submission and Approval

09-Jun-20

10-Nov-20

21-Mar-20 A

22-Jul-20 A

100%

111

ES0002000

M&E AIP Process Mechanical Submission and Approval

30-Dec-19

19-Apr-21

30-Dec-19 A

22-Dec-20 A

100%

118

ES0001000

Mobilization and Preliminary Set Up

30-Dec-19

07-Jul-20

30-Dec-19 A

20-Jul-20 A

100%

-13

ES0002060

M&E AIP Building Services Submission and Approval

30-Dec-19

11-Aug-20

30-Dec-19 A

30-Oct-20 A

100%

-80

ES0002065

M&E Design Basis & Civil Guidance Dwg

30-Dec-19

19-Apr-20

30-Dec-19 A

24-Jul-20 A

100%

-96

ES0002095

M&E DDA Site Wide Electrical Submission and Approval

11-Nov-20

30-Mar-21

23-Jul-20 A

04-Jun-21 A

100%

-66

ES2450

M&E Procurement of Mechanical Equipment - RO and ERD Rack

22-Feb-21

22-Nov-21

22-Jul-20 A

28-Dec-21 A

100%

-36

Switchboard / Genset / Building Services

14-Mar-20

07-Jan-21

14-Mar-20 A

28-Feb-21 A

100%

-52

ES0001010

AIP Civil Design Submission and Approval

30-Dec-19

23-Nov-20

30-Dec-19 A

31-Aug-20 A

100%

84

KD0000100

Letter of Acceptance

15-Nov-19

15-Nov-19 A

100%

0

KD0000110

Commencement of the Works

30-Dec-19

30-Dec-19 A

100%

0

KD0000120

Original Completion of the Works (1170 Days)

13-Mar-23

13-Mar-23 A

100%

0

KD0000200

Possession of First Stage Portion A

30-Dec-19

30-Dec-19 A

100%

0

KD0000210

Possession of First Stage Portion B

30-Dec-19

30-Dec-19 A

100%

0

KD0000220

Possession of Area for Access Road

30-Dec-19

30-Dec-19 A

100%

0

KD0000230

Possession of Temporary Works Area 1

30-Dec-19

30-Dec-19 A

100%

0

KD0000240

Possession of Temporary Works Area 2

30-Dec-19

30-Dec-19 A

100%

0

KD0000250

Possession of Temporary Works Area 3

30-Dec-19

30-Dec-19 A

100%

0

KD0000260

Possession of Temporary Works in Clear Water Bay Country Park

30-Dec-19

30-Dec-19 A

100%

0

KD0000130

Revised Completion of the Works (324 Days EOT Granted)

14-Mar-23 A

31-Jan-24 A

100%

KD0000510

Planned Completion of the Works

30-Jun-24 A

100%

Duration

Baseline Start

Baseline Finish

Remaining

Activity ID

Activity Name

Baseline

ES2470

M&E Procurement of Electrical Equipment - CLP Substation for LV

Target Milestone

Milestone

Procureme

Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule Procurement of Major Plant & Equipment Schedule

Project Prog

Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024 Project Programme Updated as at 31 Jul 2024

Commence

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Commencement and Completion Date

Actual Work

Critical Bar

Early Bar

M&E Desig

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

M&E Design AIP and DDA

Civil Design

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Civil Design AIP and DDA

Executive S

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Executive Summaries

Actual Level of Effort

Possession

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Possession of Site

Preliminary

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Preliminary Setup

Summary Bar

Target Bar

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates

Key Dates