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/A and 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. This is the 4th Annual EM&A Review 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 May 2023 to 30 April 2024.

A4. The EM&A programme for this contract has covered environmental monitoring on water quality, construction noise level at selected noise sensitive receivers, 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 environmental monitoring and audit works

A5. A summary of the environmental monitoring and audit works undertaken in the reporting period are summarized in Table I.

A6. No construction 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.

A7. Construction Phase Impact Water Quality Monitoring was conducted as schedule in the reporting period. One hundred and fourteen (114) action level exceedances and ninety- two (92) limit level exceedances of Suspended Solid were recorded in the reporting period. Pre-operation Phase Impact Water Quality Monitoring was conducted as schedule in the reporting period. One hundred and fifty-seven (157) action level exceedances and one hundred and nine (109) limit level exceedances of Suspended Solid were recorded in the reporting period. Summary of exceedances could be referring to Appendix G.

A8. All Action and Limit Level exceedance was concluded to be unrelated to the Project. Details of the exceedance could be referring to Appendix L of the corresponding Monthly EM&A Report.

A9. Total eleven (11) of dechlorinated effluent sample were taken during the discharge of dechlorinated effluent by contractor. No TRC exceedance of action or limit levels was obtained during the discharge of dechlorinated effluent.

A10. Nine hundred and seventy-three (973) times of landfill gas monitoring were conducted in the reporting period. No action or limit level exceedance was recorded in the reporting period.

A11. Pre-operation phase coral monitoring was commenced in December 2023. There were no AL/LL exceedances observed during the reporting period.

A12. Pre-operation phase fishery monitoring for dry season 2024 was carried out on 17 and 24 February 2024. There is no AL/LL exceedance during the reporting period.

Table I Summary of Environmental Monitoring Works

Environmental Monitoring works	Frequency
Noise Monitoring	N/A
Construction Phase Water Quality Monitoring	52
Pre-operation Phase Water Quality Monitoring	61
Pre-operation Phase Coral Monitoring	5
Pre-operation Phase Fishery Monitoring	2
Landfill Gas Monitoring	973
Environmental Site Inspection	53

Complaint Handling and Prosecution

A13. One environmental complaint was received from the EPD in the reporting period, no notifications of summons and prosecution was received during the reporting period.

Reporting Change

A14. There was no change to be reported that may affect the on-going EM&A programme.

1. Basic Contract Information

1.1. Background

The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua, S.A. Trading 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/A and No. EP-01/503/2015/B) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/A and No. EP-01/503/2015/B) to AJCJV for the Contract.

1.2. The Reporting Scope

This is the 4th Annual EM&A Review Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 May 2023 to 30 April 2024.

1.3. Contract Organization

The Contract Organization structure for Construction Phase is presented in Figure 1.1 and contact details of the key personnel are presented in Table 1.1 below:

Figure 1.1 Contract Organization Chart

Table 1.1 Contact Details of Key Personnel

Party

Position

Name

Telephone no.

Remark

Project Proponent (WSD)

SE/CM2

Milton Law

2634-3573

Supervising Officer

(Binnies Hong Kong Limited)

Project Manager

Christina Ko

2608-7302

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

Environmental Monitoring Manager

Joy Chan

6468-1782

Until 24 March

2024

Environmental Monitoring Manager

Tommy Law

6468-1782

On the position from 25 April

2024

Acuity Sustainability Consulting Limited

Environmental Team Leader (ETL)

Jacky Leung

2698-6833

Until 21 April

2024

Toby Wan

9719-5422

On the position from 22 April

2024

ANewR Consulting Limited

Independent Environmental Checker (IEC)

Louis Kwan

2618-2831

Until 31 May

2023

Alex Chan

Until 31 January

2024

Lam Environmental Services Limited

Independent Environmental Checker (IEC)

Serena Shek

6149-6683

On the position from 1 February

2024

1.4. Summary of Construction Works

The construction programme is presented in Appendix A. Detail of the major construction activities undertaken could be referred to Section 1.8 in each monthly EM&A Report.

The status for all environmental aspects is presented in Table 1.2.

Table 1.2 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 to 6 June 2020

Parameters	Status
Construction Phase Marine Impact Monitoring	Ceased from 1 September 2023
Pre-Operation Phase Marine Impact Monitoring	On-going from 12 December 2023
Impact Monitoring of Effluent Discharge from Main Disinfection	Complete in November 2023 and December 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
Ecology (Coral)
Pre-operation phase Regular Coral Monitoring (Monthly)	On-going (Started from December 2023)
Ecology (Fishery)
Pre-operation phase Regular Fishery Monitoring (Monthly)	On-going (Started from December 2023)
Ecology (Landscape)
Pre-operation phase Landscape and Visual Site Inspection	On-going
Waste Management
Mitigation Measures in Waste Management Plan	On-going
Landfill Gas
Regular Monitoring when construction works are within the 250 m Consultation Zone	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.

2. Noise

2.1. Monitoring Requirements

To ensure no adverse noise impact, 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.

2.2. Monitoring Locations

The monitoring locations were normally 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) was 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 2.1 below.

Table 2.1 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

Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

2.3. Monitoring Parameter, frequency and duration

Construction noise level were 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 2.2 summarizes the monitoring parameters, frequency, and duration of the impact noise monitoring.

Table 2.2 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

2.4. Impact Monitoring Methodology

The monitoring methodology and QA/QC procedure could be referring to Section 2.3 of the Monthly EM&A Report.

2.5. 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 Noise per EM&A Manual

Time Period

Action

Limit (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 G.

2.6. Monitoring Results and Observations

Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are Contract-related construction activities undertaken within a radius of 300m from the monitoring stations. No monitoring station was located within a radius of 300m of the Contract site as shown in Figure 2.4, no impact monitoring for noise impact was conducted in the reporting period.

Figure 2.4 Site Layout Plan with Noise Sensitive Receivers and Desalination Plant

3. Water Quality

In accordance with the recommendations of the EIA, water quality EM&A is required during dredging for the submarine pipelines and, during operation phase. In addition, baseline water quality monitoring was 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.

Water quality monitoring for the Contract can be divided into the following stages:

- Dredging activities during construction phase;

- Discharge of effluent from main disinfection during construction phase;

- Pre-operation - before operation phase

- Operation phase - first year upon commissioning; and,

- Continuous monitoring of effluent quality (Operation phase)

In addition, the marine works contractor is required to complete a silt curtain efficiency test for the combined use of floating silt curtain type and cage type silt curtain for dredging at seawater intake to confirm the silt curtain reduction efficiency assumptions of the assessment. The details of testing plan together with the silt curtain deployment plan shall be submitted by the ET to seek approval from the IEC and EPD.

3.1. Water Quality Parameters

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 to be measured in the impact water quality monitoring are listed in Table 3.1.

Table 3.1 Parameters measured in the impact marine water quality monitoring

Parameters	Unit	Abbreviation	Stage
Parameters	Unit	Abbreviation	Construction	Pre-operation
In-situ measurements
Dissolved oxygen	mg/L	DO	🗸	🗸
Temperature	oC	-	🗸	🗸
pH	-	-	🗸	🗸
Turbidity	NTU	-	🗸	🗸
Salinity	0/00	-	🗸	🗸
Total Residual Chlorine	mg/L	TRC	-	🗸

Parameters	Unit	Abbreviation	Stage
Parameters	Unit	Abbreviation	Construction	Pre-operation
Laboratory measurements
Suspended Solids	mg/L	SS	🗸	🗸
Iron	mg/L	Fe		🗸

In addition to the water quality parameters, other relevant data was 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 Equipment

The monitoring methodology, monitoring equipment and QA/QC procedure could be referring to Section 3.1.2 - 3.1.4 of the Monthly EM&A Report.

3.3. Monitoring Location

Marine Water Quality Monitoring

The impact water quality monitoring locations are in accordance with the EM&A Manual and detailed in Table 3.2 and Figure 3.1 below.

Table 3.2 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

Station	Easting	Northing	Description
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

Remark*: NF1 to NF3 are added for the operation phase of TKODP in accordance with Table 5.3 in the approved EM&A Manual.

WSR1 to WSR37 were identified in accordance with Annex 14 of the EIAO-TM as well as Clause 3.4.4.2 of the Environmental Impact Assessment Study Brief for Desalination Plant at Tseung Kwan O (No. ESB-266/2013). WSR1 to WSR3 are sited near the Tung Lung Chau Fish Culture Zone; WSR16 and WSR36 are sited near the coral assemblages along the coastlines of Fat Tong Chau and Kwun Tsai respectively; WSR 4 and WSR33 are sited near the Coastal Protection Area and coral assemblages in waters of Tai Miu Wan; WSR37 is sited near the fisheries resource including spawning and nursery grounds at the coastal water of Tit Cham Chau. NF1 to NF3 are the Edge of Mixing zone.

Figure 3.1 Impact water quality monitoring locations under EM&A Manual

Effluent Monitoring from Main Disinfection

According to the approved Flushing and Disinfection Procedure and Supplementary of the Disinfection Procedure for Desalination Plant at Tseung Kwan O, the sampling point of the dechlorinated effluent was located at Contact tank/Product Water Tank (PWT) and T1GKC01AA502/manhole 18. The approved sampling location was shown in Table 3.3, Figure 3.2 and Figure 3.3 below.

Table 3.43 Sampling location of dechlorinated effluent

System/Loop

Discharge

location

Sampling Location

Contact tank/

Product Water Tank (PWT)

Culvert

Contact tank/PWT

Connection to dist. network

Manhole 18 in

connection point

Sampling point

T1GKC01AA502/manhole 18

Figure 3.2 Impact water quality monitoring point for dechlorinated effluent (Contact tank/PWT)

Figure 3.3 Impact water quality monitoring point for dechlorinated effluent (Sampling point T1GKC01AA502/manhole 18)

3.4. Action and Limit levels

Marine Water Quality Monitoring

The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual. Based on the baseline water quality monitoring data and the derivation criteria, the Action/Limit Levels have been derived and are presented in Table 3.4.

Table 3.4 Derived Action and Limit Levels for Water Quality

Parameters	Action	Limit
Marine Water Quality 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
Marine Water Quality 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)	34.25 PSU or 9% exceedance of value at any impact station compared with corresponding data from control station	34.56 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.

iv. For the Action and Limit Levels adopted during First-year Operation Phase Monitoring, further review would be made according to the EM&A Manual during Operation Phase.

v. Monitoring of Total Residual Chlorine (Disinfection) will be conducted when cleaning and sterilization of the new freshwater main is carried out.

vi. Monitoring of Iron and Total Residual Chlorine were conducted during the pre-operation phase.

3.5. Monitoring Programme

Marine Water Quality Monitoring

The ET of the Contract had conducted the construction phase impact water quality monitoring between 1 May 2023 and 31 August 2023 at the ten designated monitoring stations and the additional pre-operation phase marine water quality monitoring between 12 December 2023 and 30 April 2024 at the thirteen designated monitoring stations near TKO in accordance with the EM&A Manual and Contract Specification.

Effluent Monitoring from Main Disinfection

According to the approved EM&A Manual Section 5.1.6(b), Flushing and Disinfection Procedure and Supplementary of the Disinfection Procedure was prepared by ET and approved by EPD. The dechlorinated effluent was conducted by the contractor on 24 November 2023, 2 December 2023 and 3 December 2023 in accordance with the EM&A Manual and Contract Specification

3.6. Monitoring results and observations

Marine Water Quality Monitoring

The construction phase water quality monitoring was suspended on 1 September 2023 following the completion of marine-related construction works, and the pre-operation phase marine impact monitoring commenced in December 2023.

The water quality monitoring at the designated locations were conducted by the ET as scheduled in the reporting period. The graphical presentation of the water quality monitoring result was shown in Appendix D.

Pre-operation Phase Impact Water Quality Monitoring was conducted as schedule in the reporting period. One hundred and fifty-seven (157) action level exceedances and One hundred and nine (109) limit level exceedances of Suspended Solid were recorded in the reporting period

Details of the exceedance could be referring to Appendix L of the Monthly EM&A Report. Effluent Monitoring from Main Disinfection

Total eleven (11) of dechlorinated effluent sample were taken during the discharge of dechlorinated effluent by contractor. No TRC exceedance of action or limit levels was obtained during the discharge of dechlorinated effluent. Monitoring results are summarized in Table 3.5.

Table 3.5 Summary of dechlorinated effluent Monitoring Results

Location	Contact Tank / Product Water Tank Flushing after Neutralization
Date	24 Nov 2023				2 Dec 2023	3 Dec 2023
Time	16:00	17:00	18:00	19:00	23:59	01:00	02:00	03:00	04:00	05:00	06:00
TRC (mg/L)	0.08	0.03	0.02	0.01	0.04	0.04	0.03	0.02	0.01	0.00	0.01

5. Landfill Gas Monitoring

5.1. Monitoring Requirement

In according 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 freshwater 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.

Since part of the desalination plant (Wan Po Road and MIC compound/Basketball Court) and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone in this contract (Figure 5.1), landfill gas monitoring would be required for Wan Po Road and MIC compound/Basketball Court (Figure 5.2) if excavations were conducted at more than 300mm deep. Although SENT Landfill Extension has commenced operation since November 2021, no excavation works were conducted at MIC compound/Basketball Court. Hence no landfill gas monitoring would be scheduled for MIC compound/Basketball Court at the current stage.

Map Description automatically generated

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

Diagram Description automatically generated

Figure 5.2 Location Map for Landfill Gas Monitoring at Wan Po Road

5.2. Monitoring Parameters

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

The following parameters were monitored:

- Methane

- Oxygen

- Carbon Dioxide

- Barometric Pressure

5.3. MONITORING EQUIPMENT

Landfill Gas monitoring was carried out using intrinsically safe, portable multi-gas monitoring instruments. Detail of monitoring equipment used in the reporting period could be referred to Section 5.10 of the corresponding Monthly EM&A Report.

5.4. Monitoring results and observations

Nine hundred and seventy-three (973) times of landfill gas monitoring were conducted in the reporting period. No action or limit level exceedance was recorded in the reporting period.

Action and Limit Level are provided in Table 5.1.

Table 5.1 Action / Limit Levels and Event and Action Plan for LFG Hazard

Parameters	Level		Action
Oxygen (O2)	Action Level < 19% O2		Ventilate trench/void to restore O2 to > 19%
	Limit Level < 19% O2		Stop works Evacuate personnel/prohibit entry Increase ventilation to restore O2 to > 19%
Methane (CH4)	Action Level	>10% LEL	Post "No Smoking" signs Prohibit hot works Increase ventilation to restore CH4 to <10% LEL
	Limit Level	>20% LEL	Stop works Evacuate personnel/prohibit entry Increase ventilation to restore CH4 to<10% LEL
Carbon Dioxide (CO2)	Action Level	>0.5% CO2	Ventilate to restore CO2 to < 0.5%
	Limit Level	>1.5% CO2	Stop works Evacuate personnel / prohibit entry Increase ventilation to restore CO2 to <0.5%

6. Ecology (Coral Monitoring)

Under the approval conditions of the EIA Report for the Project, an EM&A programme on coral for the pre-operation phase of the Project is recommended. Pursuant to these EIA approval conditions and Condition 3.1 of the EP and FEP, details of the regular coral monitoring programme have been proposed based on the baseline coral monitoring results in the Report on Pre-Operation Baseline Coral Monitoring and Regular Coral Monitoring Methodology.

Monitoring Location

In accordance with Appendix B Section 5.1 of the approved supplementary EM&A Manual, two indirect impact sites (C2 and C3) and one control site (C8) as shown in Figure 6.1 should be monitored during the pre-operation Phase. Pre- operation coral survey should be conducted at the indirect impact and control sites. Ten selected hard coral colonies with similar species should be tagged at each of the control and indirect impact sites before commencement of the operation phase. Tagged hard coral colonies should be monitored in open waters during the pre- operation phase and operation phase.

A map of the island Description automatically generated

Figure 6.1 Spot Dive Check Areas Two Proposed Indirect Impact Sites (C2 and C3) and one control site (C8) during pre-operation Phase

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 6.1.

Table 6.1 Action and Limit Level for Coral Monitoring Equipment

Parameter	Action Level Definition	Limit Level Definition
Mortality	If during Impact Monitoring a 15% increase in the percentage of partial mortality on the corals occurs at more than 20% of the tagged indirect impact site coral colonies that is not recorded on the tagged corals at the control site, then the Action Level is exceeded	If during Impact Monitoring a 25% increase in the percentage of partial mortality on the corals occurs at more than 20% of the tagged indirect impact site coral colonies that is not recorded on the tagged corals at the control site, then the Limit Level is exceeded

Note: If the defined Action Level or Limit Level for coral monitoring is exceeded, the actions as set out in Table E3 of Appendix E will be implemented.

If non-compliance were found during the construction works, the actions in accordance with the Event and Action Plan will be carried out according to Appendix G.

Monitoring Frequency

Pre-operation phase coral monitoring shall be monitored once per month as the requirement of the first year of operational phase.

Monitoring Result and Observation

Pre-operation phase coral monitoring was commenced in December 2023. There were no AL/LL exceedances observed during the reporting period. The detailed result of the monitoring is presented in Appendix I of the Monthly EM&A Report.

7. Ecology (Fishery Monitoring)

The purpose of the pre-operation phase regular fisheries monitoring programme is to monitor the potential impacts on fisheries resources in the vicinity of the project site. Apart from the regular fisheries monitoring programme, a water quality monitoring programme in addition to the water quality monitoring programme in the approved EM&A Manual is also described in Section 2.4 to (i) provide supplementary information in the interpretation of the findings of the fisheries monitoring and (ii) assist the monitoring of the potential impact on the Tung Lung Chau Fish Culture Zone (FCZ) in Joss House Bay.

Monitoring Location

In accordance with Section 2.3 of the approved Methodology Paper on Regular Fisheries Monitoring, it is recommended to set up six (6) fisheries monitoring locations in Joss House Bay and its vicinity to monitor the fisheries resources.

Two (2) sampling locations are set up in close proximity of the direct footprint of the proposed submarine utilities around TKO Area 137. These sampling locations represent the potential Project impact zones (i.e. areas at and in close proximity to the footprint of the proposed submarine utilities that will be directly affected by the Project works).

Two (2) gradient locations are proposed between the proposed submarine utilities and Tung Lung Chau FCZ to assist in the interpretation and identification of any potential fisheries impact in the vicinity of the FCZ.

Two (2) reference locations are proposed in the outer Joss House Bay between the waters of Tung Lung Chau and Fat Tong Mun. These reference locations are further away and will not be affected by the Project discharge (based on the EIA prediction) and will serve as control stations. Any significant fisheries impact identified at the reference locations should be caused by other natural factors or non-Project activities. The trends of fisheries conditions recorded in the reference locations will be used to assist in the interpretation of the trends of fisheries impact identified in the impact and gradient locations.

The coordinates of the proposed monitoring locations are shown in Figure 7.1.

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.

Seven hundred and fifty-two (752) of the general water quality monitoring results of SS obtained had exceeded the Action level. Six hundred and eighteen (618) of the general water quality monitoring results of SS obtained during the reporting period had exceeded the Limit Level.

Details of the exceedance could be referring to Appendix L of the corresponding Monthly Report.

Nine hundred and seventy-three (973) times of landfill gas monitoring were conducted in the reporting period. No action or limit level exceedance was recorded in the reporting period.

Pre-operation phase coral monitoring was commenced in December 2023. There were no AL/LL exceedances observed during the reporting period.

One environmental complaint was received from EPD on 22 January 2024 in the reporting period. Detailed information could be referred January 2024 Monthly EM&A Report. No notification of summons and prosecution was received in the reporting period. Summary of complaint log are presented in Appendix H.

Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract. In the reporting period, site inspections were carried out from May 2023 to April 2024.

Fifty-three (53) site inspection were carried out in the reporting period.

Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections and during the reporting period could be referring to Appendix E and corresponding Monthly Report.

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.

9. Conclusions and Recommendations

This is the 4th Annual EM&A Review Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 May 2023 to 30 April 2024, in accordance with the EM&A Manual and the requirement under FEP - 01/503/2015/A and FEP - 01/503/2015/B.

No noise monitoring was conducted in the reporting period due to the over distant monitoring station from the works location, in which construction activities were not undertaken within a radius of 300m from the monitoring locations.

The EM&A works for water quality were conducted during the reporting period in accordance with the EM&A Manual.

Construction Phase Impact Water Quality Monitoring was conducted as schedule in the reporting period. One hundred and fourteen (114) action level exceedances and ninety- two (92) limit level exceedances of Suspended Solid were recorded in the reporting period. Pre-operation Phase Impact Water Quality Monitoring was conducted as schedule in the reporting period. One hundred and fifty-seven (157) action level exceedances and one hundred and nine (109) limit level exceedances of Suspended Solid were recorded in the reporting periodAll Action and Limit Level exceedances were unrelated to the project.

Details of the exceedance could be referring to Appendix L of the corresponding Monthly EM&A Report.

Nine hundred and seventy-three (973) times of landfill gas monitoring were conducted in the reporting period. No action or limit level exceedance was recorded in the reporting period.

Pre-operation phase coral monitoring was commenced in December 2023. There were no AL/LL exceedances observed during the reporting period.

Pre-operation phase fishery monitoring for dry season 2024 was carried out on 17 and 24 February 2024. There is no AL/LL exceedance during the reporting period.

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

According to the environmental site inspections performed in the reporting period, the Contractor is reminded to pay attention on maintaining proper materials storage, site tidiness and chemical storage on site.

One (1) environmental complaint was received from EPD on 23 January 2024 in the reporting period. Detailed information could be referred January 2024 monthly EM&A report. No notification of summons or prosecution was received in the reporting period.

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

Appendix A

Master Programme

Appendix C

Summary of Implementation Status of Environmental Mitigation

EIA Reference	Recommended Environmental Protection Measures/ Mitigation Measures	Objectives of the recommended measures & main concerns to address	Implementation Agent	Implementation Stage			Implementation status	Relevant Legislation & Guidelines
EIA Reference			Implementation Agent	D	C	O	Implementation status	Relevant Legislation & Guidelines
Air Quality
S4.8.1	Impervious dust screen or sheeting will be provided to enclose scaffolding from the ground floor level of building for construction of superstructure of the new buildings.	Land site/ During Construction	Contractor(s)		ü		Implemented	Air Pollution Control (Construction Dust)
S4.8.1	Impervious sheet will be provided for skip hoist for material transport.	Land site/ During Construction, particularly dry season	Contractor(s)		ü		NA	-
S4.8.1	The area where dusty work takes place should be sprayed with water or a dust suppression chemical immediately prior to, during and immediately after dusty activities as far as practicable.	Land site/ During Construction	Contractor(s)		ü		Implemented	-
S4.8.1	All dusty materials should be sprayed with water or a dust suppression chemical immediately prior to any loading, unloading or transfer operation.	Land site/ During Construction	Contractor(s)		ü		Implemented, reminder issued	-
S4.8.1	Dropping heights for excavated materials should be controlled to a practical height to minimize the fugitive dust arising from unloading.	Land site/ During Construction	Contractor(s)		ü		Implemented	-
S4.8.1	During transportation by truck, materials should not be loaded to a level higher than the side and tail boards and should be dampened or covered before transport.	Land site/ During Construction	Contractor(s)		ü		Implemented	-
S4.8.1	Wheel washing device should be provided at the exits of the work sites. Immediately before leaving a construction site, every vehicle shall be washed to remove any dusty material from its body and wheels as far as practicable.	Land site/ During Construction	Contractor(s)		ü		Implemented	-
S4.8.1	Road sections between vehicle-wash areas and vehicular entrance will be paved.	Land site/ During Construction	Contractor(s)		ü		Implemented	-
S4.8.1	Hoarding of not less than 2.4m high from ground level will be provided along the length of the Project Site boundary.	Land site/ During construction	Contractor(s)	ü	ü		N/A	-
S4.8.1	Haul roads will be kept clear of dusty materials and will be sprayed with water so as to maintain the entire road surface wet at all times.	Land site/ During construction	Contractor(s)		ü		Implemented, reminder issued	-

EIA Reference	Recommended Environmental Protection Measures/ Mitigation Measures	Objectives of the recommended measures & main concerns to address	Implementation Agent	Implementation Stage			Implementation status	Relevant Legislation & Guidelines
EIA Reference			Implementation Agent	D	C	O	Implementation status	Relevant Legislation & Guidelines
S4.8.1	Temporary stockpiles of dusty materials will be either covered entirely by impervious sheets or sprayed with water to maintain the entire surface wet all the time.	Land site/ During construction	Contractor(s)		ü		Implemented, reminder issued	-
S4.8.1	Stockpiles of more than 20 bags of cement, dry pulverised fuel ash and dusty construction materials will be covered entirely by impervious sheeting sheltered on top and 3- sides.	Land site/ During construction	Contractor(s)		ü		N/A	-
S4.8.1	All exposed areas will be kept wet always to minimize dust emission.	Land site/ During construction	Contractor(s)		ü		Implemented, reminder issued	-
S4.8.1	Ultra-low-sulphur diesel (ULSD) will be used for all construction plant on-site, as defined as diesel fuel containing not more than 0.005% sulphur by weight) as stipulated in Environment, Transport and Works Bureau Technical Circular (ETWB-TC(W)) No 19/2005 on Environmental Management on Construction Sites.	Land site/ During construction/ During Operation	Contractor(s)		ü	ü	Implemented	Environment, Transport and Works Bureau Technical Circular (ETWB- TC(W)) No 19/2005 on Environmental Management on Construction Sites
S4.8.1	The engine of the construction equipment during idling will be switched off.	Land site/ During construction	Contractor(s)		ü		Implemented	-
S4.8.1	Concrete batching plant will be required on site. control measures recommended in the Guidance Note on a Best Practicable Means for Cement Works (Concrete Batching Plant) (BPM 3/2 (93)) will be implemented. The control measures recommended in the Guidance Note on a Best Practicable Means for Cement Works (Concrete Batching Plant) (BPM 3/2 (93)) will be implemented.	Land site/ During construction	Contractor(s)		ü		N/A	-
S4.8.1	Regular maintenance of construction equipment deployed on-site will be conducted to prevent black smoke emission.	Land site/ During construction	Contractor(s)		ü		Implemented	-
S4.10	To ensure proper implementation of the recommended dust mitigation measures and good construction site practices during the construction phase, environmental site audits on weekly basis is recommended throughout the construction period.	Land site/ During construction	Contractor(s)/ ET & IEC		ü		Implemented

Note: D - Design stage C - Construction O - Operation

EIA Reference	Recommended Environmental Protection Measures/ Mitigation Measures	Objectives of the recommended measures & main concerns to address	Implementation Agent	Implementation Stage			Implementation status	Relevant Legislation & Guidelines
EIA Reference			Implementation Agent	D	C	O	Implementation status	Relevant Legislation & Guidelines
Noise
S5.7	Only well-maintained plant will be operated on-site and plant will be serviced regularly during the construction phase.	All area/ During construction	Contractor(s)		ü		Implemented	A Practical Guide for the Reduction of Noise from Construction Works
S5.7	Silencers or mufflers on construction equipment will be utilised and will be properly maintained during the construction phase.	Noise control/ During construction	Contractor(s)		ü		N/A
S5.7	Mobile plant, if any, will be sited as far away from NSRs as possible.	Noise control/ During construction	Contractor(s)		ü		N/A
S5.7	Machines and plant (such as trucks) that may be in intermittent use will be shut down between work periods or will be throttled down to a minimum.	Noise control/ During construction	Contractor(s)		ü		Implemented
S5.7	Plants known to emit noise strongly in one direction will, wherever possible, be orientated so that the noise is directed away from the nearby NSRs.	Noise control/ During construction	Contractor(s)		ü		N/A
S5.7	Material stockpiles and other structures will be effectively utilised, wherever practicable, in screening <

Rev.	Description of Modification	Date
1.	First Issue	13/06/2024
2.	Revised According to Comments	03/09/2024
3.	Revised According to Comments	18/11/2024

Revision History

CONTENTS

Executive Summary

1. Basic Contract Information

1.1. Background

1.2. The Reporting Scope

1.3. Contract Organization

1.4. Summary of Construction Works

2. Noise

2.1. Monitoring Requirements

2.2. Monitoring Locations

2.3. Monitoring Parameter, frequency and duration

2.4. Impact Monitoring Methodology

2.5. Action and Limit Levels

2.6. Monitoring Results and Observations

3. Water Quality

3.1. Water Quality Parameters

3.2. Monitoring Equipment

3.3. Monitoring Location

3.4. Action and Limit levels

3.5. Monitoring Programme

3.6. Monitoring results and observations

4. Waste

5. Landfill Gas Monitoring

5.1. Monitoring Requirement

5.2. Monitoring Parameters

5.3. MONITORING EQUIPMENT

5.4. Monitoring results and observations

6. Ecology (Coral Monitoring)

7. Ecology (Fishery Monitoring)

8. Summary of Exceedance, Complaints, Notification of Summons and Prosecutions

9. Conclusions and Recommendations

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 Graphical Presentation
Appendix E	Site Inspection Proforma
Appendix F	Waste Flow Table
Appendix G	Summary of Exceedances
Appendix H	Complaint Log
Appendix I	Event/Action Plan for Noise and Water Quality Monitoring Exceedance