CONTENTS

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

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) 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 8th 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 2021 to 28 February 2022.

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 Project included the followings:

- Land Survey;

- Construction of ActiDAFF Roof Slab;

- Construction of Reverse Osmosis (RO) Building - staircases; water tank; Electrical Building roof and internal finishing works;

- Construction of Product Water Storage Tank (PWST) perimeter wall and Electrical Building¡¦s roof slab;

- Construction of sludge thickener, Post Treatment Building (PTB);

- Construction of On-Site Chlorine Generation Building (OSCG Bldg);

- Manhole construction and Glass Reinforced Plastic (GRP) pipe installation;

- Commence construction of manholes no. 8 and no. 9 adjacent to PWST;

- Construction of manholes no.15 and no.16 adjacent to ActiDAFF and RO;

- Construction of 1/F to 2/F walls and columns of Administration Building

- Construction of Post Treatment Building 1/F;

- Construction of first floor columns and walls of Administration Building;

- Construction of structural wall and Roof of Chemical Building;

- Construction of reinforced concrete (R.C) footing and support of Inspection Corridor;

- Internal finishing work in Product Water Storage Tank (PWST), Main Electrical & Central Chiller Plant Building;

- Outfall Shaft ‐ dewatering; rock cutting and excavation works;

- Outfall Shaft - works inside the caisson to check and grout/welding water leaking spots;

- Outfall Shaft - welding works of working platform atop the caisson;

- Outfall Shaft - material lifting for rock coring and pumping clean seepage water within silt curtain area;

- Intake tunnel - Demobilize the pipe jacking system and commencement of grouting works;

- Excavation & Lateral Support (ELS) erection and marine dredging commencement and disposal at Intake Shaft;

- Installation of brackets and welding works of the waling at Intake Shaft;

- Pipe jacking at Combined Shaft for Intake & Outfall pipelines;

- Cable drawpit construction;

- Glass Reinforced Plastic (GRP) pipe lamination and laying;

- Construction of 1st floor structural wall of Chemical Building;

- Wan Po Road Sewage Rising Main Works - Temporary Traffic Arrangement (TTA), excavation and laying High-Density Polyethylene (HDPE) pipe;

- Construction of On-Site Chlorine Generation (OSCG) Building footing and roof floor;

- Construction of base slab of Pump house;

- Dismantling of tower crane TC03;

- Construction of carbon dioxide (CO2) tank footing

- E&M works - ActiDAFF - scaffolding, installation of E&M piping; and

- E&M works - Reverse Osmosis (RO) Building - Fire services installation;

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

- Construction dust and noise generation from marine construction works, excavation works, ELS installation works, breaking of concrete surface and construction works; rock cutting works and pipe piling driving works

- Waste generation from the construction activities

- Impact on water quality from marine construction works and inland construction works

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

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

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

- Sorting and storage of general refuse and construction waste

- Deployment of temporary silt curtain in the area where marine construction works were conducted and deployment of water sedimentation tanks for treatment of wastewater at inland areas before discharge

SUMMARY OF EXCEEDANCE & INVESTIGATION & FOLLOW-UP

A8. 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.

A9. The EM&A works for water quality were conducted during the reporting period in accordance with the EM&A Manual.

A10. Water quality monitoring was conducted as schedule in the reporting period. One hundred and ninety-three (193) action level exceedances and One hundred and thirty-two (132) limit level exceedances for suspended solids (SS) of impact water quality monitoring were recorded.

A11. In this reporting period, 66 times of landfill gas monitoring were recorded at Wan Po Road (Ch1+360 - Ch1+513). No action and limit level exceedance for methane, oxygen and carbon dioxide was recorded. Monitoring was conducted during excavations at 1m depth or more within the consultation zone and whenever workers entered the excavation on the day.

A12. Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. 13 times of weekly Joint site inspections were carried out by ET and IEC.

A13. 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	December 2021	January 2022	February 2022
Noise Monitoring	N/A	N/A	N/A
Water Quality Monitoring	2, 4, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28 and 30 Dec 2021	1, 4, 6, 8, 11, 13, 15, 18 ,20, 22, 25, 27, 29 and 31 Jan2022	4, 8, 10, 12, 15, 17, 19, 22, 24 and 26 Feb 2022.
Landfill Gas monitoring	31 Dec 2021	1, 4, 5, 6, 7, 8, 10, 11, 12, 13, 14, 15, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29 and 31 Jan 2022	8, 9, 10, 11, 12, 14, 15, 16 and 17 Feb 2022
Environmental Site Inspection	7, 15, 22 and 31 Dec 2021	4, 11, 18, 26 and 31 Jan 2022	8, 17, 23 and 28 Feb 2022

Table II Summary Table for Exceedance in the Reporting Period

Environmental Monitoring	Parameter	No of non- Project related exceedance		Total No. of non-Project related exceedance	No of Project related exceedance		Total No. of Project related exceedance
		AL	LL		AL	LL
Noise	Leq (30min)	N/A	N/A	N/A	N/A	N/A	N/A
Water	DO	0	0	0	0	0	0
	Turbidity	0	0	0	0	0	0
	SS	193	132	325	0	0	0
	pH	0	0	0	0	0	0
	Salinity	0	0	0	0	0	0
Landfill Gas	O2	0	0	0	0	0	0
	CH4	0	0	0	0	0	0
	CO2	0	0	0	0	0	0

COMPLAINT HANDLING AND PROSECUTION

A14. No environmental complaint was received during the reporting period.

A15. Neither notifications of summons nor prosecution was received for the Project.

REPORTING CHANGE

A16. There was no change to be reported that may affect the on-going EM&A programme.

1. 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 (DPTKO) under Contract No. 13/WSD/17 (the Contract).

Acuity Sustainability Consulting Limited (ASCL) is commissioned by AJCJV to undertake the Environmental Team (ET) services as required and/or implied, both explicitly and implicitly, in the Environmental Permit (EP), Environmental Impact Assessment Report (EIA Report) (Register No. AEIAR-192/2015) and Environmental Monitoring and Audit Manual (EM&A Manual) for the Contract; and to carry out the Environmental Monitoring and Audit (EM&A) programme in fulfillment of the EIA Report¡¦s EM&A requirements and Contract No. 13/WSD/17 Specification requirements.

Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-01/503/2015) and Variation of Environmental Permit (No. EP-01/503/2015/A) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/A) to AJCJV for the Contract.

1.2. THE REPORTING SCOPE

This is the 8th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 December 2021 to 28 February 2022.

1.3. PROJECT ORGANIZATION-

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

Figure 1.1 Project Organization Chart

Contact details of the key personnel are presented in Table 1.1 below:

Table 1.1 Contact Details of Key Personnel

Party	Position	Name	Telephone no.
Project Proponent	SE/CM2	Benny Lam	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
Acuity Sustainability Consulting Limited	Environmental Team Leader	Jacky Leung	2698-6833
ANewR Consulting Limited	Independent Environmental Checker (IEC)	Louis Kwan	2618-2831

1.4. SUMMARY OF CONSTRUCTION WORKS

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

Key activities carried out in this reporting period for the Project included the following:

- Land Survey;

- Construction of ActiDAFF parapet and solar panel supports at roof

- Construction of Reverse Osmosis (RO) Building - staircases and internal finishing;

- Construction of Sludge tank, sludge thickener and Post treatment building (PTB);

- Construction of On-Site Chlorine Generation (OSCG) Building and carbon dioxide (CO2) tank area;

- Internal finishing works at Product Water Storage Tank (PWST) and Main Electrical & Central Chiller Plant Building

- Construction of manhole and Glass Reinforced Plastic (GRP) pipe installation;

- Commence construction of Manholes no.15 and no.16 adjacent to ActiDAFF and Reverse Osmosis Area (RO);

- Construction of first and second floor walls and columns of Administration Building;

- Construction of reinforced concrete (RC) support of Inspection Corridor;

- Construction of floor structural wall and roof of Chemical Building;

- Dewatering, predrill, rock cutting and excavations at Outfall Shaft;

- Excavation & Lateral Support (ELS) erection and commencement of marine dredging and disposal at Intake Shaft;

- Retrieval of DN 2500 Tunnel Boring Machine (TBM) underwater at Intake Shaft;

- Demobilize the pipe jacking system and commencement of grouting works at Intake Shaft;

- Concrete blinding laying and backfill with aggregate at Intake Shaft;

- Pipe jacking works at Combined Shaft for Intake & Outfall pipelines;

- Construction of base slab of Pump house

- E&M works - ActiDAFF - scaffolding, installation of E&M piping;

- E&M works - RO- Fire services installation;

- E&M works - CO2 tank area - installation of Silos; and

- E&M works - Chiller Building - installation of chillers;

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/ Licenses/ Notification	Reference	Validity Period
Environmental Permit	FEP - 01/503/2015/A	Throughout the Contract
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA)	Ref. No.: 451539	-
Wastewater Discharge Licence (Land and Marine works)	WT00035775-2020	24/07/2020 -31/07/2025
Chemical Waste Producer Registration	5213-839-A2987-01	Throughout the Contract
Billing Account for Disposal of Construction Waste	7036276	Throughout the Contract
Construction Noise Permit (24 hours) - CNP for general works, TBM at Combined Shaft and marine works	GW-RE1041-21	01/11/2021 - 30/04/2022
Vessel CHITs for fill disposal	7039300	20/01/2022 - 20/04/2022
Dumping at Sea Ordinance (DASO) Permit (Category L)	EP/MD/22‐028	02/08/2021 - 01/02/2022
Dumping at Sea Ordinance (DASO) Permit (Category M)	EP/MD/22-083	03/12/2021 - 02/01/2022

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

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

Parameters	Status
Water Quality
Baseline Monitoring under EM&A Manual	The baseline water quality monitoring was conducted between 12 May 2020 and 6 June 2020
Impact Monitoring	On-going
Noise
Baseline Monitoring	The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4
Impact Monitoring	On-going
Waste Management
Mitigation Measures in Waste Management Plan	On-going
Landfill Gas
Regular Monitoring when Construction Works are within the 250m Consultation Zone	In this reporting period, 66 times of landfill gas monitoring were recorded at Wan Po Road (Ch1+360 - Ch1+513). No exceedance of action and limit level for methane, oxygen and carbon dioxide was observed. Monitoring was conducted during excavations at 1m depth or more within the consultation zone and whenever workers entered the excavation on the day.
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 of the Project during the reporting period is provided in Appendix C.

2. 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 Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)	Leq 30min L10 30min & L90 30min

2.3. MONITORING LOCATIONS

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.

According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 below.

Table 2.2 Noise Sensitive Receivers

NSR ID	Noise Sensitive Receivers	Monitoring Location	Position
NSR 4	Creative Secondary School	Roof Floor	1 m from facade
NSR 24	PLK Laws Foundation College	Pedestrian Road on Ground Floor	Free-field
NSR 31	School of Continuing and Professional Studies - CUHK	Roof Floor	1 m from facade

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements. Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.

Figure 2.1 NSR4 Creative Secondary School

Figure 2.2 NSR24 PLK Laws Foundation College

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

2.4. ACTION AND LIMIT LEVELS

The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) ¡§Noise from Construction Activities - Non-statutory Controls¡¨ and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [¡§EPD¡¨] under the Environmental Impact Assessment Ordinance, Cap 499,

S.16 are presented in Table 2.3.

Table 2.3 Action and Limit Levels for Construction Noise Monitoring per EM&A Manual

Time Period	Action Level	Limit Level (dB(A))
0700-1900 on normal weekdays	When one documented complaint is received from any one of the noise sensitive receivers	- 70 dB(A) for school and - 65 dB(A) during examination period

Notes: Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively.

If exceedances were found during noise monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix E.

2.5. MONITORING RESULTS AND OBSERVATIONS

Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. No noise monitoring station was located within a radius of 300m of the Project 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 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 commissioning; and,

- Continuous monitoring of effluent quality.

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.

With the onset of marine dredging activities in late April at Outfall Shaft Area, a silt curtain efficiency test has been conducted at the Outfall Shaft Area on 16t April 2021 at 6 monitoring intervals (08:00, 10:00, 12:00, 14:00, 16:00, 18:00). The baseline monitoring event has been conducted on 10 April 2021 at 5 monitoring locations. Testing protocols and methodologies had followed the guidelines as presented in the EM&A Manual Annex C. Detailed analysis of in-situ and laboratory data was presented in a separate report which has been submitted to EPD after approval by IEC on 31 May 2021. The overall Silt Removal Effectiveness at Outfall Shaft Area for the combined used of cage and floating type silt curtains was 95.28%.

3.1. WATER QUALITY PARAMETERS

The parameters that have been selected for measurement in situ and in the laboratory are those that were either determined in the EIA to be those with the most potential to be affected by the construction works or are a standard check on water quality conditions. Parameters measured in the impact monitoring are listed in Table 3.1.

Table 3.1 Parameters measured in the impact marine water quality monitoring

Parameters	Unit	Abbreviation
In-situ measurements
Dissolved oxygen	mg/L	DO
Temperature	oC	-
pH	-	-
Turbidity	NTU	-
Salinity	0/00	-
Total Residual Chlorine NOTE1	mg/L	TRC
Laboratory measurements
Suspended Solids	mg/L	SS
Iron-Soluble NOTE2	mg/L	Fe
Anti-scalant as Reactive Phosphorus NOTE2	mg/L	PO4 as P-

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

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.

3.1.1. MONITORING LOCATIONS

The impact water quality monitoring locations in accordance to the EM&A Manual and detailed in

Table 3.2 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
NF1	846542	813614	Edge of mixing zone, ~ 200m west of outfall diffuser
NF2	846942	813614	Edge of mixing zone, ~ 200m east of outfall diffuser
NF3	846742	813414	Edge of mixing zone, ~ 200m south of outfall diffuser

Figure 3.1 Impact Water Quality Monitoring Locations under EM&A Manual

3.2. MONITORING EQUIPMENT, METHODOLOGY AND QA/QC PROCEDURES

The monitoring methodology, equipment used and QA/QC procedures could be referring to Section 3.1.2 -3.1.4, 3.1.6-3.1.7 and 3.2 of the Monthly EM&A Report.

3.3. ACTION AND LIMIT LEVELS

The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual and based on the baseline water quality monitoring data and the derivation criteria, the Action/Limit Levels have been derived and are presented in Table 3.3.

Table 3.33 Derived Action and Limit Levels for Water Quality

Parameters	Action	Limit
Construction 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
First-year Operation Phase Monitoring iv
DO in mg/L	Surface and Middle 7.30 mg L-1 Bottom 7.31 mg L-1 Tung Lung Chau Fish Culture Zone	Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone
	5.1 mgL-1 or level at control station (whichever the lower)	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)	34.28 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 mgL-1	0.3 mgL-1

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.

3.4. MONITORING RESULTS AND OBSERVATIONS

General water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) were conducted on 2/12, 4/12, 7/12, 9/12, 11/12, 14/12, 16/12, 18/12, 21/12, 23/12, 25/12, 28/12, 30/12 and 1/1, 4/1, 6/1, 8/1, 11/1, 13/1, 15/1, 18/1 ,20/1, 22/1, 21/1, 27/1, 29/1, 31/1 and 4/2, 8/2, 10/2, 12/2, 15/2, 17/2, 19/2, 22/02, 24/2 and 26/2.

During the impact water quality monitoring period between December 2021 to February 2022, one hundred and ninety-three (193) of the general water quality monitoring results of suspended solids (SS) obtained had exceeded the Action Level. One hundred and thirty-two (132) of the general water quality monitoring results of SS obtained during the reporting quarter had exceeded the Limit Level.

Investigation on the reason of exceedance has been carried out, where the exceedances of SS on 2/12, 4/12, 9/12, 11/12, 14/12, 16/12, 18/12, 21/12, 23/12, 25/12, 28/12 and 30/12, 1/01, 4/1, 6/1, 8/1, 11/1, 15/1, 18/1, 20/1, 22/1, 25/1, 27/1, 29/1 and 31/1, 4/2, 8/2, 10/2, 12/2, 15/2, 17/2, 19/2, 22/2, 24/2 and 26/2 were concluded to be unrelated to the project. Details of the instigation could be referring to Monthly EM&A Report Appendix O.

Table 3.4 Summary of Regular Impact Water Quality Monitoring Results (Mid-Flood)

Location		Parameter
		Salinity (ppt)			Dissolved Oxygen (mg/L)						pH			Turbidity (NTU)			Suspended Solids (mg/L)			Temp. (oC)
					Surface & Middle			Bottom
		Dec	Jan	Feb	Dec	Jan	Feb	Dec	Jan	Feb	Dec	Jan	Feb	Dec	Jan	Feb	Dec	Jan	Feb	Dec	Jan	Feb
CE	Avg.	32.3	32.8	32.9	8.58	8.8	9.1	8.8	8.8	9.1	8.27	8.2	8.3	3.6	3.3	4.6	4.87	4.1	6.9	23.5	21.1	18.4
	Min.	30.6	30.1	30.6	7.89	8.1	8.3	8.1	8.1	8.2	8.05	8.0	8.0	2.7	2.3	3.5	2.50	2.5	2.5	22.1	19.7	16.6
	Max	33.4	35.1	34.0	9.82	9.6	10.1	9.6	9.6	10.2	8.42	8.5	8.4	5.2	4.3	6.1	12.0	12.0	20.0	25.8	23.1	20.4
CF	Avg.	32.3	32.8	32.9	8.49	8.7	9.1	8.7	8.7	9.1	8.34	8.3	8.3	4.2	3.9	3.7	5.25	5.4	7.5	23.5	21.2	18.5
	Min.	30.8	30.3	31.6	7.80	8.2	8.3	8.2	8.2	8.3	8.08	8.0	8.1	3.1	2.2	2.5	2.50	2.5	2.5	21.7	20.1	16.4
	Max	33.5	34.9	34.2	9.72	9.0	10.0	9.1	9.1	10.1	8.56	8.5	8.4	6.4	5.7	5.0	14.0	22.0	27.0	25.9	22.9	20.2
WSR1	Avg.	32.3	32.8	32.8	8.69	8.7	9.2	8.6	8.6	9.2	8.25	8.2	8.3	2.7	2.7	3.0	5.88	4.4	6.3	23.5	21.1	18.4
	Min.	30.2	30.3	30.8	8.16	8.2	8.4	8.2	8.2	8.4	8.08	8.0	8.0	1.3	1.6	1.6	2.50	2.5	2.5	21.7	19.6	16.4
	Max	33.7	35.0	34.2	9.16	9.4	10.1	9.4	9.4	10.1	8.47	8.5	8.4	4.1	4.0	4.2	13.0	8.0	19.0	25.5	22.7	20.4
WSR2	Avg.	32.3	33.0	32.8	8.59	9.0	9.1	8.9	8.9	9.1	8.28	8.3	8.3	2.8	2.3	2.2	5.31	5.0	7.9	23.6	21.2	18.3
	Min.	30.4	31.1	30.9	8.01	8.3	8.3	8.4	8.4	8.3	8.11	8.0	8.1	1.4	1.5	1.8	2.50	2.5	2.5	22.3	19.7	16.6
	Max	34.0	35.0	34.0	9.34	9.8	10.1	9.9	9.9	10.2	8.47	8.5	8.5	4.0	3.4	2.9	12.0	21.0	23.0	25.6	23.2	19.9
WSR3	Avg.	32.3	32.4	32.8	8.66	8.7	9.0	8.7	8.7	9.0	8.31	8.3	8.2	2.7	2.7	3.0	6.51	6.5	8.1	23.5	23.5	18.3
	Min.	31.0	31.1	31.2	7.67	7.7	8.4	7.7	7.7	8.3	8.10	8.1	8.0	1.6	1.6	1.8	2.50	2.5	2.5	21.9	21.9	16.4
	Max	33.2	33.3	33.7	9.39	9.4	10.1	9.4	9.4	10.0	8.52	8.5	8.5	4.6	4.6	4.1	23.0	23.0	21.0	25.8	25.8	19.9
WSR4	Avg.	32.1	32.7	32.9	8.47	8.8	9.1	8.8	8.8	9.1	8.29	8.2	8.3	2.7	2.7	3.2	6.86	6.4	8.2	23.6	21.2	18.4
	Min.	30.9	30.6	31.0	7.72	8.3	8.4	8.0	8.0	8.4	8.06	8.0	8.1	1.6	1.8	2.1	2.50	2.5	2.5	22.1	20.0	16.5
	Max	33.4	35.3	34.4	9.11	9.6	10.0	9.6	9.6	10.0	8.50	8.4	8.5	4.2	3.8	4.6	26.0	36.0	22.0	25.9	22.5	20.1
WSR16	Avg.	32.2	32.2	33.1	8.75	8.8	8.9	8.8	8.8	8.9	8.29	8.3	8.3	2.9	2.9	3.1	6.42	6.4	7.0	23.6	23.6	18.4
	Min.	30.9	31.0	30.8	8.08	8.1	8.4	8.0	8.0	8.4	8.06	8.1	8.1	1.7	1.7	1.5	3.00	3.0	2.5	22.0	22.0	16.6
	Max	33.8	33.8	34.2	9.52	9.5	9.7	9.5	9.5	9.8	8.45	8.5	8.5	4.3	4.3	4.0	26.0	26.0	21.0	25.6	25.6	20.4
WSR33	Avg.	32.0	32.7	33.0	8.63	8.6	9.0	8.6	8.6	9.0	8.29	8.3	8.3	2.6	2.9	3.2	6.92	4.3	6.4	23.6	21.1	18.4
	Min.	30.5	30.6	31.0	8.02	8.0	8.3	8.0	8.0	8.4	8.09	8.0	8.1	1.8	1.8	2.0	3.00	2.5	2.5	22.0	19.9	16.5
	Max	33.1	34.3	34.2	9.28	9.0	9.8	9.1	9.1	9.9	8.57	8.5	8.4	3.6	4.3	4.3	24.0	8.0	21.0	26.1	22.6	20.0
WSR36	Avg.	32.4	32.7	32.8	8.61	8.9	9.0	8.8	8.8	9.0	8.29	8.3	8.3	2.9	2.7	2.8	7.03	4.9	7.0	23.6	21.1	18.4
	Min.	31.1	30.9	31.2	8.00	8.3	8.4	8.2	8.2	8.3	8.11	8.1	8.1	1.6	1.3	1.2	2.50	2.5	2.5	22.1	19.9	16.3
	Max	33.7	35.2	33.8	9.17	9.7	10.0	9.8	9.8	10.1	8.56	8.5	8.5	4.4	4.0	4.0	24.0	13.0	25.0	26.2	22.6	20.2
WSR37	Avg.	32.2	32.8	32.9	8.68	8.8	9.0	8.8	8.8	9.0	8.29	8.3	8.2	2.7	2.8	2.9	7.95	5.3	5.8	23.6	21.1	18.3
	Min.	31.1	30.6	31.4	7.85	8.3	8.3	8.3	8.3	8.3	8.10	8.0	8.0	1.7	1.8	2.1	3.00	2.5	2.5	21.9	19.8	16.5
	Max	33.5	35.2	34.3	9.50	9.8	9.8