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. This is the 54th Monthly 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 August to 31 August 2024.

A4. 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

A5. Key activities carried out in this reporting period for the Contract included the followings:

Administration Building

- Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking;

- Painting works and external finishing works;

- Minor Installation of building services, minor cables laying and termination. T&C

Chemical building

- Defect rectification

Main Electrical & Central Chiller Plant Building

- Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning

ActiDAFF

- Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning

Product Water Storage Tank Building

- Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning

OSCG Building

- Installation of cladding and railing on Brine Maker Tank

- Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning

Reverse Osmosis Building

- Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets

- Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation

Post Treatment Building

- Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning

Inspection gallery

- Interior fitting out works and painting works

- Minor Installation of building services, Lift Installation

Combined Shaft and Pump room

- Testing & Commissioning

- Installation of outfall grating and defect rectification Guard House

- Defect rectification

- Minor cable laying and termination Others

- Slope works

A6. The major environmental impacts brought by the above construction works include:

- Construction dust and noise generation from construction works and excavation works and slope works;

- Waste generation from the construction activities

A7. The key environmental mitigation measures implemented for the Contract in this reporting period associated with the above construction works include:

- Dust suppression by regular wetting and water spraying for construction works;

- Reduction of noise from equipment and machinery on-site and regular inspection to machinery and plants/vehicles on-site to ensure proper functioning;

- Deployment of silt curtain at the inshore water outflow;

- Sorting and storage of general refuse and construction waste; and

- Deployment protective fencing for trees

Summary of exceedance & investigation & follow-up

A8. 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 exceedance of the action Level was recorded during the reporting period.

A9. The construction phase marine water quality programme was ceased from 1 September 2023 due to the completion of marine-related construction works.

A10. Water quality monitoring of the discharge of dechlorinated effluent in disinfection procedure is completed in December 2023. The hourly dechlorinated effluent monitoring during the discharge is finished.

A11. In this reporting period, 81 times of landfill gas monitoring were periodically conducted at TKO Area 137 (Ch1+120 - Ch1+800) until 31 August 2024. No exceedances of action level and limit level was observed.

A12. Joint site inspections of the construction work by ET and IEC were carried out on 26 August 2024 to audit the mitigation measures implementation status.

Complaint Handling and Prosecution

A13. No environmental complaint, notification of summons and prosecution was received in the reporting period.

Reporting Change

A14. According to the contractor’s information, the TKODP commenced operation phase on 1 July 2024. The outstanding construction works were being carried out during this reporting period.

Summary of Upcoming Key Issues and Key Mitigation Measures

A15. Key activities anticipated in the next reporting period for the Contract will include the followings:

Administration Building

- Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking;

- Painting works and external finishing works;

- Minor Installation of building services, minor cables laying and termination. T&C

Chemical building

- Defect rectification

Main Electrical & Central Chiller Plant Building

- Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning

ActiDAFF

- Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning

Product Water Storage Tank Building

- Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning

OSCG Building

- Installation of cladding and railing on Brine Maker Tank

- Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning

Reverse Osmosis Building

- Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets

- Minor Installation of building services, minor cable laying and termination,

Testing & Commissioning, PV Panel Installation

Post Treatment Building

- Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning

Inspection gallery

- Interior fitting out works and painting works

- Minor Installation of building services, Lift Installation

Combined Shaft and Pump room

- Testing & Commissioning

- Installation of outfall grating and defect rectification Guard House

- Defect rectification

- Minor cable laying and termination Others

- Slope works

A16. The major environmental impacts brought by the above construction works will include:

- Construction dust and noise generation from excavation and construction works and slope works;

1.7. 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.

Contract Proponent (Water Supplies Department)

SE/CM2

Milton Law

2634-3573

Supervising Officer (Binnies Hong Kong Limited)

Project Manager

Augustine Li

2608-7671

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

Tommy Law

6468-1782

Acuity Sustainability Consulting Limited

Environmental Team Leader

Toby Wan

9719-5422

Lam Environmental Services Limited

Independent Environmental Checker (IEC)

Serena Shek

6149-6683

Summary of Construction Works

1.8. Details of the major construction activities undertaken in this reporting period are shown below. The master programme is presented in Appendix A.

1.9. Key activities carried out in this reporting period for the Contract included the followings:

		Administration Building - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; Minor Installation of building services, minor cables laying and termination. T&C
		Chemical building - Defect rectification
		Main Electrical & Central Chiller Plant Building - Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning
	ActiDAFF - Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning
	Product Water Storage Tank Building - Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning
	OSCG Building - Installation of cladding and railing on Brine Maker Tank - Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning
	Reverse Osmosis Building - Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets - Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation
	Post Treatment Building - Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning
	Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation
	Combined Shaft and Pump room - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Others - Slope works
1.10. A summary of the valid permits, licences, and/or notifications on environmental

protection for this Contract 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	-
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 sampling point S.P.1 is approved by the EPD on 25 June 2024 (EPD ref.: EP640/W3/D1358/462 874).
Construction Noise Permit
GW-RE0667-24	22/06/2024	20/12/2024	Valid	-

1.11. The status for all environmental aspects is presented in Table 1.3.

Table 1.3 Summary of Status for Key Environmental Aspects under the EM&A Manual

Parameters	Status
Water Quality
Baseline Monitoring under EM&A Manual	The baseline water quality monitoring was conducted between 12 May 2020 to 6 Jun 2020.
Construction Phase Impact Monitoring	Ceased from 1 September 2023
Operation phase Marine Impact Monitoring	On-going
Impact Monitoring of Effluent Discharge from Main Disinfection	Completed
Noise
Baseline Monitoring	The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4
Impact Monitoring	Completed
Waste Management
Mitigation Measures in Waste Management Plan	On-going
Landfill Gas
Regular Monitoring when construction works are within the 250 m Consultation Zone	On-going
Ecology (Coral)
Operation phase Regular Coral Monitoring (Monthly)	On-going
Ecology (Fishery)
Operation phase Regular Fishery Monitoring (Seasonally)	On-going
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

1.12. 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

Monitoring Requirements

2.1. 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. 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. Construction works would follow stipulations of the valid Construction Noise Permits if works had to be conducted during restricted hours or public holidays. Table 2.1 summarizes the monitoring parameters, frequency, and duration of the impact noise monitoring.

Table 2.1 Noise Monitoring Parameters, Time, Frequency and Duration

Time

Duration

Interval

Parameters

Daytime: 0700-1900

Day time: 0700-1900

(during normal weekdays)

Continuously in

Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)

Leq 30min

L10 30min & L90 30min

Monitoring Locations

2.3. 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) should be made to the free-field measurements.

2.4. 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

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

3. Water Quality

3.1. In accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. 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.

3.2. The water quality monitoring programme was be carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.

3.3. 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; and

- Operation activities during operation phase.

Water Quality Parameters

3.4. 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 monitoring are listed in Table 3.1.

Table 3.1 Parameters measured in the Impact Marine Water Quality Monitoring

Parameters	Unit	Abbreviation
In-situ measurements
Dissolved oxygen	mg/L	DO
Temperature	oC	-
pH	-	-
Turbidity	NTU	-
Salinity	0/00	-
Total Residual Chlorine NOTE1	mg/L	TRC
Laboratory measurements
Suspended Solids	mg/L	SS
Iron-Soluble	mg/L	Fe
Anti-scalant as Reactive Phosphorus	mg/L	PO4 as P-

NOTE 1: Monitoring of Total Residual Chlorine will be conducted when cleaning and sterilization of the new freshwater main is carried out.

3.5. In addition to the water quality parameters, other relevant data were also being 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.

Monitoring Equipment

3.6. For water quality monitoring, the following equipment were used:

Dissolved Oxygen and Temperature Measuring Equipment - The instrument was a portable, weatherproof dissolved oxygen measuring instrument complete with cable, sensor, comprehensive operation manuals, and was operable from a DC power source. It was capable of measuring: dissolved oxygen levels in the range of 0 - 20 mg/L and 0 - 200% saturation; and a temperature of 0 - 45 degrees Celsius. It has a membrane electrode with automatic temperature compensation complete with a cable of not less than 35 m in length. Sufficient stocks of spare electrodes and cables were available for replacement where necessary (e.g. YSI model 59 DO meter, YSI 5739 probe, YSI 5795A submersible stirrer with reel and cable or an approved similar instrument).

Turbidity Measurement Equipment - The instrument was a portable, weatherproof turbidity-measuring unit complete with cable, sensor and comprehensive operation manuals. The equipment was operated from a DC power source, it has a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU and complete with a cable with at least 35 m in length (for example Hach 2100P or an approved similar instrument).

Salinity Measurement Instrument - A portable salinometer capable of measuring salinity in the range of 0 - 40 ppt was provided for measuring salinity of the water at each monitoring location.

Water Depth Gauge - A portable, battery-operated echo sounder (for example Seafarer 700 or a similar approved instrument) was used for the determination of water depth at each designated monitoring station. This unit will preferably be affixed to the bottom of the work boat if the same vessel is to be used throughout the monitoring programme. The echo sounder was suitably calibrated.

Positioning Device - A Global Positioning System (GPS) was used during monitoring to allow accurate recording of the position of the monitoring vessel before taking measurements. The Differential GPS, or equivalent instrument, was suitably calibrated at appropriate checkpoint (e.g. Quarry Bay Survey Nail) to verify that the monitoring station is at the correct position before the water quality monitoring commence.

Water Sampling Equipment - A water sampler, consisting of a PVC or glass cylinder of not less than two litres, which can be effectively sealed with cups at both ends, was used. The water sampler has a positive latching system to keep it open and prevent premature closure until released by a messenger when the sampler is at the selected water depth.

Total Residual Chlorine -Total residual chlorine (TRC) shall be measured in-situ using approved test kit.

Sampling / Testing Protocols

3.7. All in situ monitoring instruments were checked, calibrated, and certified by a laboratory accredited under HOKLAS or any other international accreditation scheme before use, and subsequently re-calibrated at monthly intervals throughout the stages of the water quality monitoring. Responses of sensors and electrodes were checked with certified standard solutions before each use.

3.8. On-site calibration of field equipment was following the “Guide to On-Site Test Methods for the Analysis of Waters”, BS 1427: 2009. Sufficient stocks of spare parts were maintained for replacements when necessary. Backup monitoring equipment was made available so that monitoring can proceed uninterrupted even when equipment is under maintenance, calibration etc.

Laboratory Measurement and Analysis

3.9. Sufficient volume of each water sample was collected for carrying out the laboratory analyses. Using chain of custody forms, collected water samples were transferred to a HOKLAS accredited laboratory (Acumen Laboratory and Testing Limit - HOKLAS 241) for immediate processing. The determination work was start within the next working day after collection of the water samples. Analytical methodology and sample preservation of other parameters were based on the latest edition of Standard Methods for the Examination of Waste and Wastewater published by APHA, AWWA and WPCF and methods by USEPA, or suitable method in accordance with requirements of HOKLAS or another internationally accredited scheme. The QA/QC details were in accordance with the requirements of HOKLAS or another internationally accredited scheme.

3.10. Parameters for laboratory measurements, standard methods and detection limits are presented in Table 3.2.

Table 3.2 Laboratory measurements, standard methods, and corresponding detection limits of marine water quality monitoring

Parameters	Standard Methods	Detection Limit	Reporting Limit	Precision
Dissolved oxygen	Instrumental, CTD	0.1	-	+-25%
Temperature	Instrumental, CTD	0.1	-	+-25%
pH	Instrumental, CTD	0.1	-	+-25%
Turbidity	Instrumental, CTD	0.1	-	+-25%
Salinity	Instrumental, CTD	0.1	-	+-25%
Suspended Solids	APHA 23rd Ed 2540D	1.0	2.5	+-17%
Iron	APHA 3111 B	0.2	-	+-25%
Total residual chlorine	Test Kit (Lovibond MD200)	Lowest limit = 0.01mg/L; Upper limit = 6 mg/L	-	+-25%

Monitoring Location

Construction Phase

3.11. The Impact water quality monitoring was ceased from 1 September 2023 due to the completion of marine-related construction works.

Operation phase

3.12. The operation phase impact water quality monitoring locations are in accordance with the EM&A Manual and detailed in Table 3.3 below. A schedule for water quality monitoring was prepared by the ET and submitted to IEC and EPD prior to the commencement of the monitoring.

Table 3.3 Location of Impact Water Quality Monitoring Stations

Station	Easting	Northing	Description
CE	843550	815243	Upstream control station at ebb tide
CF	846843	810193	Upstream control station at flood tide
WSR1	846864	812014	Ecological sensitive receiver at Tung Lung Chau
WSR2	847645	812993	Fisheries sensitive receiver at Tung Lung Chau
WSR3	848023	813262	Ecological sensitive receiver at Tung Lung Chau
WSR4	847886	814154	Ecological sensitive receiver at Tai Miu Wan
WSR16	845039	815287	Ecological sensitive receiver at Fat Tong Chau
WSR33	847159	814488	Ecological sensitive receiver at Tai Miu Wan
WSR36	846878	814081	Ecological sensitive receiver at Kwun Tsai
WSR37	846655	813810	Ecological sensitive receiver at Tit Cham Chau
NF1	846542	813614	Edge of Mixing zone, ~ 200m west of outfall diffuser
NF2	846942	813614	Edge of Mixing zone, ~ 200m east of outfall diffuser
NF3	846742	813414	Edge of Mixing zone, ~ 200m south of outfall diffuser

3.13. 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.

Table 3.4 Derived Action and Limit Levels for Water Quality

Parameters	Action	Limit
Operation phase Impact 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)
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

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

Monitoring Results and Observations

Construction Phase

3.17. 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

3.18. According to the contractor’s information, the operation phase of TKODP commenced on 1 July 2024. Details of the operation phase water quality monitoring will be presented in the Operation Monthly EM&A Report.

4. Waste

4.1. The waste generated from this Contract 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 Contract 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 Contract, the quantities of different types of waste generated in the reporting month are summarized in Table 4.1. Details of cumulative waste management data are presented as a waste flow table in Appendix G.

Table 4.1 Quantities of Waste Generated from the Contract during the reporting period

Reporting Month	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)
Aug 2024	163.330	0.000	0.000	0.000	163.330	0.000	0.000	0.000	0.000	2.460	42.260

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

5. Landfill Gas Monitoring

Monitoring Requirement

5.1. 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.

Monitoring Programme

5.2. 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.

Monitoring Location

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

5.4. 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.

5.5. For excavations between 300mm and 1m deep, measurements were carried out:

- Directly after the excavation has been completed; and

- Periodically whilst the excavation remains open.

5.6. The area required to be monitored for landfill gas in the reporting period is shown in

Figure 5.1.

Action and Limit Levels

7.3. 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 7.1.

Table 7.1 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 D will be implemented.

7.4. 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 D.

Monitoring Frequency

7.5. Operation phase coral monitoring shall be monitored once per month as the requirement of the first year of operational phase.

Monitoring Result and Observation

7.6. According to the contractor’s information, the operation phase of TKODP commenced on 1 July 2024. Details of the operation phase coral monitoring will be presented in the Operation Monthly EM&A Report.

8. Ecology (Fishery Monitoring)

8.1. The purpose of the 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

8.2. 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.

8.3. 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).

8.4. 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.

8.5. 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.

8.6. The coordinates of the proposed monitoring locations are shown in Figure 8.1.

10. EM&A Site Inspection

10.1. 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 on 6, 13, 20 and 26 August 2024 at the site portions listed in Table 10.1 below.

Table 10.1 Summaries of Site Inspection Record

Date	Inspected Site Portion	Time
6 August 2024	TKO Area 137	14:30 - 15:30
13 August 2024	TKO Area 137	14:30 - 15:30
20 August 2024	TKO Area 137	14:30 - 15:30
26 August 2024	TKO Area 137	09:15 - 12:30

10.2. Joint site inspection with IEC was carried out on 26 August 2024.

10.3. Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections and during the reporting period are summarized in Table 10.2.

Table 10.2 Site Observations

Date	Environmental Observations	Follow-up Status
6 August 2024	No major environmental deficiency was observed.	N/A
13 August 2024	No major environmental deficiency was observed.	N/A
20 August 2024	No major environmental deficiency was observed.	N/A
26 August 2024	No major environmental deficiency was observed.	N/A

10.4. 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. Site inspection proforma of the reporting period is provided in Appendix H.

11. Future Key Issues

11.1. Works to be undertaken in the next reporting month are:

Administration Building

- Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking;

- Painting works and external finishing works;

- Minor Installation of building services, minor cables laying and termination. T&C

Chemical building

- Defect rectification

Main Electrical & Central Chiller Plant Building

- Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning

ActiDAFF

- Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning

Product Water Storage Tank Building

- Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning

OSCG Building

- Installation of cladding and railing on Brine Maker Tank

- Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning

Reverse Osmosis Building

- Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets

- Minor Installation of building services, minor cable laying and termination,

Testing & Commissioning, PV Panel Installation

Post Treatment Building

- Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning

Inspection gallery

- Interior fitting out works and painting works

- Minor Installation of building services, Lift Installation

Combined Shaft and Pump room

- Testing & Commissioning

- Installation of outfall grating and defect rectification Guard House

- Defect rectification

- Minor cable laying and termination

Others

- Slope works

11.2. The major environmental impacts brought by the above construction works will include:

- Construction dust and noise generation from excavation and construction works and slope works;

- Waste generation from construction activities.

11.3. The key environmental mitigation measures for the Project in the coming reporting period associated with the above construction works will include:

- Dust suppression by regular wetting and water spraying for construction works;

- Reduction of noise from equipment and machinery on-site by regular checking of on-site plant/vehicle to ensure proper functioning;

- Sorting and storage of general refuse and construction waste;

- Deployment of silt curtain at the inshore water outflow; and

- Deployment protective fencing for trees

12. Conclusions and Recommendations

12.1. This is the 54th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 August to 31 August 2024, in accordance with the EM&A Manual and the requirement under FEP-01/503/2015/B.

12.2. No noise monitoring was conducted in the reporting period due to the construction activities not being undertaken within a radius of 300m from the monitoring locations.

12.3. The construction phase marine water quality programme was ceased from 1 September 2023 due to the completion of marine-related construction works.

12.4. The operation phase of TKODP commenced on 1 July 2024. Details of the operation phase water quality monitoring, coral monitoring, fishery monitoring and operation landfill gas monitoring will be presented in the Operation Monthly EM&A Report.

12.5. In this reporting period, 81 times of landfill gas monitoring were periodically conducted at TKO Area 137 (Ch1+120 - Ch1+800) until 20 April 2024. No exceedances of action level and limit level was observed.

12.6. Weekly environmental site inspections were conducted during the reporting period. Observations and reminders were reported during the site inspections. All items are rectified within the reporting period. The environmental performance of the project was therefore considered satisfactory.

12.7. According to the environmental site inspections performed in the reporting month, the Contractor is reminded to pay attention on chemical storage, site hygiene and dust suppression mitigation measures.

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

12.9. 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

Rev.	Description of Modification	Date
1.	First Issue for Comments	06/09/2024
2.	Revised According to Comments	11/09/2024

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	Event/Action Plan
Appendix E	Landfill Gas Equipment Calibration Certificate
Appendix F	Landfill Gas Monitoring Data
Appendix G	Waste Flow Table
Appendix H	Site Inspection Proforma
Appendix I	Complaint Log
Appendix J	Exceedance Report

Parameters	Action Level	Limit Level
Oxygen (O2)	<19% O2	<19% O2
Methane (CH4)	>10% LEL	>20% LEL
Carbon Dioxide (CO2)	>0.5% CO2	>1.5% CO2

Equipment	Brand and Model	Calibration Expiry Date
Portable Gas Detector	GMI PS500 - 25492809/21	29 July 2025

Executive Summary

1. Basic Contract Information

2. Noise

3. Water Quality

4. Waste

5. Landfill Gas Monitoring

6. Ecology(Landscape)

7. Ecology (Coral Monitoring)

8. Ecology (Fishery Monitoring)

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

10. EM&A Site Inspection

11. Future Key Issues

12. Conclusions and Recommendations

methane	0-100% Lower Explosion Limit (LEL) and 0-100% v/v;
oxygen	0-25% V/V;
carbon dioxide	0-5% v/v; and
barometric pressure	mBar (absolute)

methane	>10% LEL;
oxygen	<19%
carbon dioxide	>0.5% by volume
barometric pressure	mBar (absolute)