This Monthly Environmental Monitoring and Audit (“EM&A”) Report summarise project monitoring and auditing data, with full interpretation illustrating the acceptability or otherwise of any environmental impacts and identification or assessment of the implementation status of agreed mitigation measures, including monitoring results and findings of the EM&A Programme, along with findings recorded during the site Inspections and audits, reports of Complaints, Notifications of Summons and Successful Prosecutions, and other necessary observations obtained within this reporting month of February 2025.

In the reporting month, the principal work activities conducted are as follow:

· Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;

· Excavation and site formation at San Shek Wan Sewerage Treatment Works (“SSWSTW”);

· Trenchless drilling works at Chi Ma Wan Road;

· Excavation and Excavation and Lateral Support (”ELS”) work at Pui O Sewage Pumping Station (“POSPS”);

· Superstructure Reinforced Concrete (“RC”) works at SSWSTW;

· Retaining wall construction at SSWSTW;

· Dredging and diffuser construction at SSWSTW; and

· Electrical and Mechanical (“E&M”) Installation at POSPS.

Noise Monitoring

Noise Monitoring has been conducted at 8 of the designated monitoring locations where construction works has been conducted nearby during the reporting month.

No action or limit level exceedance was recorded in construction noise level in this reporting period.

Water Quality Monitoring

Marine Water Monitoring has been conducted at 9 designated monitoring locations during the reporting month.

No action or limit level exceedances were recorded within the reporting month.

Ecological Impact Monitoring

Transplanting of the trees of Aquilaris sinensis was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

As per latest version of PTP, 4 tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

The weekly site audit was carried out by ET include checking whether good site practices are being properly implemented by the Contractor.

The extent of the work site boundaries was checked by the ET during the weekly site audit.

Complaints, Notification of Summons and Prosecution

No environmental complaint was recorded in the reporting month.

No notification of summons and successful prosecution regarding construction works were recorded in the reporting month.

Reporting Changes

Upon conclusion of Contract No: SD 15/2022 Outlying Island Sewerage Stage 2 – South Lantau Sewage Works – Environmental Team Services (2023 – 2024), the subsequent contract, Contract No. CM 04/2024 Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works – Environmental Team Services (2025-2027), has been awarded to Umwelt Consulting Limited (“UCL”), starting 1 February 2025. As such the environmental team leader (“ETL”) appointed for the Project has been updated to Mr. Ting Po Chung, Ivan since 1 February 2025. His contact details has been updated in Table 2.1.

There are no other reporting changes in the reporting month.

Future Key Issues

In coming reporting 3 months, the scheduled construction activities are listed as follows:

· Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;

· Excavation and site formation at SSWSTW;

· Trenchless drilling works (Chi Ma Wan Road);

· Excavation and ELS work at POSPS;

· Superstructure RC works at SSWSTW;

· Retaining wall construction at SSWSTW;

· Dredging and diffuser construction at SSWSTW; and

· E&M Installation at POSPS.

Key construction activities for the next three months with the recommended mitigation measures to be implemented are presented as follows:

Key Construction Works

Recommended Mitigation Measures

· Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road

· Excavation and site formation at SSWSTW

· Trenchless drilling works (Chi Ma Wan Road)

· Excavation and ELS work at POSPS

· Superstructure RC works at SSWSTW

· Retaining wall construction at SSWSTW

· Dredging and diffuser construction at SSWSTW

· E&M Installation at POSPS

· Implementation of noise pollution control in accordance with Construction Noise Mitigation Plan;

· Dust control during dust generating works;

· Silt curtain should be maintained in good condition prior to and during dredging and related marine works;

· Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;

· Adopt temporary drainage and sediment control facilities on Site;

· Vehicle wheel-washing and body washing facilities should be provided at the site entrance;

· Regular water spraying on excavation works for dust control; and

· Proper waste handling, recycling and storage.

1. Introduction

1.1 Project Background

1.1.1 The Environmental Protection Department (“EPD”) completed the Outlying Islands Sewerage Master Plan (“SMP”) Study in 1994 and drew up a SMP for Lantau Island and other outlying islands. The proposed sewerage works of the SMP were divided into 2 stages. The Stage 2 Works of the SMP were subsequently reviewed by EPD under the Outlying Islands Sewerage Master Plan Stage 2 Review (SMP Review Study) in 2001.

1.1.2 The proposed sewerage works for South Lantau were further reviewed in 2008 under the Review of Sewerage Scheme for South Lantau (Review Study). According to the Review Study, the proposed sewerage works for South Lantau would serve the unsewered areas of Shui Hau, Tong Fuk, Cheung Sha, San Shek Wan, Pui O and Ham Tin.

1.1.3 The Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works, herein referred to as “the Project”, referred to the sewerage works for South Lantau that would serve the unsewered areas of Shui Hau, Tong Fuk, Cheung Sha, San Shek Wan, Pui O and Ham Tin.

1.1.4 The Project mainly comprises of the following items:

a) Construction of a secondary sewage treatment works (“STW”) at San Shek Wan in South Lantau;

b) Construction of sewage pumping station (“SPS”) at Pui O, San Shek Wan, Cheung Sha, Cheung Fu Street, Shui Hau and Tong Fuk;

c) Construction of about 1.4km of twin submarine outfalls with a diameter of 350mm for the disposal of treated effluent from the STW at San Shek Wan;

d) Construction of about 10.1km of gravity sewers with diameters ranging from 150mm to 375mm along South Lantau Road and Chi Ma Wan Road and at Pui O; and

e) Construction of about 3.1km of twin rising mains with a diameter of 200mm to 250mm along South Lantau Road and Chi Ma Wan Road.

1.2 Environmental Monitoring & Audit Programme

1.2.1 An Environmental Impact Assessment (“EIA”) was subsequently prepared to review the potential environmental impact that would be due to the Project during its construction works and operational works. The EIA Report was submitted and approved on 24 April 2017, and Environmental Permit (“EP”) No. EP-538/2017 was subsequently granted on 13 July 2017.

1.2.2 Environmental Monitoring & Audit (“EM&A”) Programme is therefore implemented in accordance with the EM&A Manual under the EIA Report.

1.2.3 Umwelt Consulting Limited (“UCL”) has been appointed to work as the Environmental Team (“ET”) under EP No. EP-538/2017 to implement the Environmental Monitoring and Audit (“EM&A”) programme as stipulated in the EM&A Manual of the approved EIA Report for the Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works (Register No.: AEIAR-210/2017).

1.3 Monthly Environmental Monitoring & Audit Report

1.3.1 This Monthly EM&A Report summarise project monitoring and auditing data, with full interpretation illustrating the acceptability or otherwise of any environmental impacts and identification or assessment of the implementation status of agreed mitigation measures, including monitoring results and findings of the EM&A Programme, along with findings recorded during the site Inspections and audits, reports of Complaints, Notifications of Summons and Successful Prosecutions, and other necessary observations obtained within this reporting month of February 2025.

1.3.2 The structure of this Report is detailed as follows:

a) Section 1 Introduction –
Details the scope and structure of the report.

b) Section 2 Basic project Information and Environmental Status –
Summarizes project organization and key personnel contact, construction programme and works undertaken for the month. Construction programme, works undertaken during the month with illustrations, drawing showing the project area, environmental sensitive receivers and monitoring locations.

c) Section 3 Implementation Status –
Advice on the implementation status of environmental protection and pollution control/mitigation measures, as recommended in the EIA Report and summarised in the updated implementation schedule.

d) Section 4 Noise Monitoring –
Summarizes the monitoring results obtained in the reporting period, including monitoring methodology, name of laboratory and equipment used and calibration details, parameters monitored, monitoring locations (and depth), monitoring date, frequency, and duration, for impact noise monitoring.

e) Section 5 Water Quality Monitoring –
Summarizes the monitoring results obtained in the reporting period, including monitoring methodology, name of laboratory and equipment used and calibration details, parameters monitored, monitoring locations (and depth), monitoring date, frequency, and duration, for impact water quality monitoring.

f) Section 6 Ecology –
Summarizes the audit findings during the reporting month on ecological aspects.

g) Section 7 Waste Management –
Summarizes the status of waste management, including the amount and types of waste generated, and respective treatment approach.

h) Section 8 Report on Complaints, Notification of Summons and Successful Prosecutions –
Summarizes:

Ø Record of all complaints received (written or verbal) for each media, including locations and nature of complaints investigation, liaison and consultation undertaken, actions and follow-up procedures taken, results and summary;

Ø Record of notifications of summons and successful prosecutions for breaches of the current environmental protection/pollution control legislations, including locations and nature of the breaches, investigation, follow-up actions taken, results and summary;

Ø Review of the reasons for and the implications of non-compliance, complaints, summons and prosecutions including review of pollution sources and working procedures; and

Ø Description of the actions taken in the event of non-compliance and deficiency reporting and any follow-up procedures related to non-compliance.

i) Section 9 Future Key Issues –
An account of the future key issues as reviewed from the works programme and work method statements.

j) Section 10 Conclusion –
Summarises the findings conclusion drawn from the environmental monitoring and audit programme in this reporting month.

2. Basic project Information and Environmental Status

2.1 Basic Project Information

2.1.1 Drainage Services Department (“DSD”) is the project proponent and the permit holder of the Project. For the construction phase of the Project, Contractor(s), ET and Independent Environmental Checker (“IEC”) are appointed to manage and control environmental issues. Key personnel and contact particulars are summarized in Table 2.1.

2.1.2 Upon conclusion of Contract No: SD 15/2022 Outlying Island Sewerage Stage 2 – South Lantau Sewage Works – Environmental Team Services (2023 – 2024), the subsequent contract, Contract No. CM 04/2024 Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works – Environmental Team Services (2025-2027), has been awarded to Umwelt Consulting Limited (“UCL”) starting 1 February 2025. As such the environmental team leader (“ETL”) appointed for the Project has been updated to Mr. Ting Po Chung, Ivan since 1 February 2025. His contact details has been updated in Table 2.1.

2.1.3 There are no other reporting changes in the reporting month.

Table 2.1: Contact Details of Key Personnel

Party	Role	Post	Name	Contact No.	Contact Fax
Drainage Services Department	The Engineer for the Contract	Engineer	Mr. KK Chan	2594 7297	3104 6426
Binnies Hong Kong Limited	Engineer’s Representative	Resident Engineer	Mr. Kevin Chan	3529 3003	-
Kwan Lee – Chun Wo Joint Venture	Contractor	Sub Agent	Mr. Daniel Chu	6737 6701	2744 6937
		Environmental Supervisor	Ms. Joey Pang	6978 2876
		Environmental Supervisor	Mr. Philip Wong	6908 8920
SMEC Hong Kong	IEC	IEC	Ms. Kitty Lee	3995 8140	3422 3631
Umwelt Consulting Limited	ET	ET Leader	Mr. Ivan Ting	3756 9590	3582 3310

2.2 Construction Programme

2.2.1 The proposed sewerage works will collect the sewage generated from the unsewered areas of Shui Hau, Tong Fuk, Cheung Sha, San Shek Wan, Pui O and Ham Tin in South Lantau (i.e. within the Project Catchment Area) and convey it to a proposed sewage treatment works at San Shek Wan for treatment and disposal into outer bay of Pui O / Chi Ma Wan via a submarine outfall.

2.2.2 The Project was divided into 3 contracts. The current contract, Contract No. DC/2020/02 - Construction of San Shek Wan Sewage Treatment Works, Associated Submarine Outfall and Pui O Sewerage Works (“the Contract”) would have the following implementations. The works site of the Contract is also given in Figure 2.1.

2.2.3 The major components of the Contract under Environmental Permit (“EP”) (EP No. EP-538/2017) comprises:

a) Construction of a secondary sewage treatment works (“STW”) at San Shek Wan in South Lantau;

b) Construction of a sewage pumping station (“SPS”) at Pui O, San Shek Wan, Cheung Sha and Cheung Fu Street;

c) Construction of about 1.4km of submarine outfall with a diameter of 350mm for the disposal of treated effluent from the STW at San Shek Wan;

d) Construction of about 10.1km of gravity sewers with diameters ranging from 150mm to 375mm along South Lantau Road and Chi Ma Wan road and at Pui O; and

e) Construction of about 3.1km twin rising mains with a diameter of 200mm to 250mm along South Lantau Road and Chi Ma Wan Road.

2.3 Works undertaken during the Reporting Month

2.3.1 In the reporting month, the principal work activities conducted are as follow:

a) Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;

b) Excavation and site formation at SSWSTW;

c) Trenchless drilling works at Chi Ma Wan Road;

d) Excavation and ELS work at POSPS;

e) Superstructure RC works at SSWSTW;

f) Retaining wall construction at SSWSTW;

g) Dredging and diffuser construction at SSWSTW; and

h) E&M Installation at POSPS.

2.3.2 The locations of the works are shown in Figure 2.2.

2.4 Drawing Showing the Project Area, Environmental Sensitive Receivers and Monitoring Locations

2.4.1 Noise and water monitoring location plans with sensitive receivers are shown in Figure 2.3 and Figure 2.4 respectively.

3. Implementation Status

3.1 Advice on the Implementation Status of Environmental Protection and Pollution Control/Mitigation Measures

3.1.1 Mitigation measures according to the environmental mitigation implementation schedule in Annex A of EM&A Manual were generally implemented by the Contractor. Hence, the EM&A programme was considered effective and shall be maintained.

3.2 Environmental Mitigation Measures

3.2.1 Environmental mitigation measures mentioned the EIA Report were weekly reviewed and recorded in Weekly Environmental Site Audit Checklist. Also, a summary of the current status on submissions and measures mentioned in the EP No. EP-538/2017 are shown in Table 3.1.

Table 3.1: Summary of Submission Status under EP-538/2017

EP Condition	Submission and Revision No.	Date of Latest Submission
2.10	Waste Management Plan (Rev. 5) (electronic copy)	4 April 2022#
2.11	Submission of Preservation and/or Transplantation Plan for Plant Species of Conservation Importance (Rev. 23)	9 September 2022#
2.12	Submission of Compensatory Woodland Planting Plan (Rev. 23)	15 May 2023^
2.13	Silt Curtain Deployment Plan (Rev. 11)	1 June 2022#
2.14	Landscape Mitigation Plan	To be confirmed
2.15	Construction Noise Mitigation Plan (Rev. 20)	4 August 2022#

Note:

^ Submission was made to EPD

# Approval from EPD was received

3.3 Environmental Monitoring Requirements and Contractual Requirements

3.3.1 A summary of the current status on licences and/or permits on environmental protection pertinent to the Project is shown in Table 3.2.

Table 3.2: Summary of the Current Status on Licences and/or Permits on Environmental Protection Pertinent to The Project

Permits and/or Licences	Permit. No. / Account No.	Issued Date	Valid Period & Expiry Date	Status
Notification of Works Under APCO	466408	14 Apr 2021	N/A	Valid
Wastewater Discharge Licence under Water Pollution Control Ordinance	SSWSTW: WT00039636-2021	30 Dec 2021	30 Dec 2021 to 31 Dec 2026	Valid
	POPS: WT00039820-2021	31 Dec 2021	31 Dec 2021 to 31 Dec 2026	Valid
	SSWSTW: Gravity Sewer & Raising Main: WT00042613-2022	09 Jan 2023	09 Jan 2023 to 31 Jan 2028	Valid
Billing account under Waste Disposal Ordinance	Account No.: 7040411	05 May 2021	N/A	Valid
Registration as a Chemical Waste Producer	0000-931-K3428-01	13 May 2021	N/A	Valid
Construction Noise Permit under Noise Control Ordinance for SSWSTW	GW-RS0658-24	17 July 2024	09 Aug 2024 to 08 Feb 2025	Expired
	GW-RS0084-25	28 Jan 2025	09 Feb 2025 to 08 Aug 2025	Valid
Construction Noise Permit under Noise Control Ordinance for POSPS	GW-RS0856-24	17 Sep 2024	27 Sep 2024 to 26 Mar 2025	Valid
Marine Dumping Permit (Dredged Sediment Requiring Type 1 – Open Sea Disposal	EP/MD/25-024	19 Nov 2024	19 Nov 2024 to 18 May 2025	Valid

Note: Only valid permits or permits under applications within the reporting month are included.

3.4 Site Inspection and Audit Reports

3.4.1 Within this reporting month, weekly environmental site inspections were conducted on 5, 12, 17, and 24 February 2025. IEC attended the SSEMC meeting held on 17 February 2025. Holding nursery visit for transplanted trees on 24 February 2025.

3.4.2 No non-compliance was found during the site inspections while reminders on environmental measures were recommended. Reminders and/or Observations recorded during site inspections in this reporting month are listed in Table 3.3.

Table 3.3: Summary of Environmental Inspections

Inspection Date	Reminder and Recommendations	Close-out Date / Status
5 Feb 2025	Pui O Sewage Pumping Station No Reminder and/or Observation Pui O Sewage Pumping Station and San Shek Wan Sewage Treatment Works No Reminder and/or Observation	N/A
12 Feb 2025	Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works Reminder 1: The contractor is reminded to repair the washing facilities at the entrance. Reminder 2: The contractor is reminded to properly store the chemical drums after they are used.	Rectified by the contractor on 18 Feb 2025
17 Feb 2025	Pui O Sewage Pumping Station Reminder 1: The contractor is reminded to properly store the chemical drums after use. Reminder 2: The contractor is reminded to ensure the waste are properly aggregated and placed within appropriate container for disposal and/or recycle. Pui O Sewage Pumping Station and San Shek Wan Sewage Treatment Works Reminder 3: The contractor is reminded to place the construction breakers to avoid direct contact with ground soil.	Rectified by the contractor on 24 Feb 2025
24 Feb 2025	Pui O Sewage Pumping Station Reminder 1: The contractor is reminded to remove standing water in the construction site. San Shek Wan Sewage Treatment Works Reminder 2: The contractor is reminded to properly store the construction breakers after usage to avoid direct contact with the ground soil. Kam Tin Nursery No Reminder and/or Observation	Rectified by the contractor on 28 Feb 2025

4. Noise Monitoring

4.1 Monitoring Methodology

Monitoring Procedure

4.1.1 The impact noise monitoring should be carried out at all the designated monitoring stations when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations.

4.1.2 The monitoring station shall normally be at a point 1m from the exterior of the sensitive receiver’s building façade and be at a position 1.2m above the ground.

4.1.3 Façade measurements were made at the monitoring locations. For free-field measurement, a correction factor of +3dB(A) will be applied.

4.1.4 The battery condition was checked to ensure the correct functioning of the meter.

4.1.5 Parameters such as frequency weighting, the time weighting and the measurement time were set as follows:

a) Frequency weighting: A,

b) Time weighting: Fast,

c) Measurement time set: continuous 5 mins

4.1.6 Prior and after to the noise measurement, the meter was checked using the acoustic calibrator for 94dB (A) at 1000 Hz. If the difference in the calibration level before and after measurement was more than ±1.0 dB (A), the measurement would be considered invalid and repeat of noise measurement would be required after recalibration or repair of the equipment.

4.1.7 Noise measurements will be made in accordance with standard acoustical principles and shall not be made in fog, rain, wind with a steady speed exceeding 5m/s or wind with gusts exceeding 10m/s. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

Equipment Used for Noise Monitoring

4.1.8 Noise monitoring was performed using sound level meter at the designated monitoring locations. The sound level meters shall comply with the International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1) specifications. Acoustic calibrator shall be deployed to check the sound level meters at a known sound pressure level. Brand and model of the equipment is given in Table 4.1.

Table 4.1: Noise Monitoring Equipment

Equipment	Brand and Model	Serial Number	Valid Until
Integrated Sound Level Meter	Rion - NL-52	01198668	13 Jan 2026
Acoustic Calibrator	Rion - NC-75	34202223	13 Jan 2026

4.1.9 The calibration certificates of the noise monitoring equipment are attached in Appendix 4.1.

Calibration Details

4.1.10 The microphone head of the sound level meter was cleaned with soft cloth at regular intervals.

4.1.11 The sound level meter and calibrator were calibrated at yearly intervals.

Parameters Monitored

4.1.12 The construction noise level shall be measured in terms of the A-weighted equivalent continuous sound pressure level (“Leq”). L_eq_(30min) should be used as the monitoring parameter. Supplementary information for data auditing, statistical results such as L₁₀ and L₉₀ shall also be obtained for reference.

4.1.13 For impact monitoring for construction of village sewers / rising main, noise monitoring should be undertaken on weekly basis. 1 set of L_eq_(30min) noise level as 6 consecutive L_eq_(5min) between 07:00-19:00 hours on normal weekdays has been taken.

4.2 Monitoring Stations

4.2.1 The noise monitoring stations for the Project are listed and shown in Table 4.2. Impact noise monitoring was conducted once per week at the noise monitoring stations with construction works being conducted nearby. Noise monitoring has been conducted at 8 noise monitoring stations N12a, N12b, N13, N14, N15b, N16a, N16b and N17 in the reporting month.

4.2.2 Monitoring station N17 Bui O Public School is an institutional sensitive receivers. During the reporting month, no examination was conducted, as such the construction noise criteria is 70dB(A). During examination period, which was reported to be May and June 2025, the construction noise criteria will be revised to 65dB(A) accordingly.

Table 4.2: Noise Monitoring Station

Monitoring Station ID ⁺	Monitoring Location	Measurement Type	Level (in terms of no. of floor)
N01a	Shui Hau Village	Free-Field	G/F
N01c	Shui Hau Village	Free-Field	G/F
N03a	Tong Fuk Village	Free-Field	G/F
N05a	Residences at Cheung Fu Street	Free-Field	G/F
N07	Government Holiday Bungalows	Free-Field	G/F
N08	Cheung Sha Ha Tsuen	Free-Field	G/F
N10	Cheung Sha Sheung Tsuen	Façade	G/F
N11b	San Shek Wan – Ming Garden	Free-Field	G/F
N12a *	Lo Uk Tsuen	Free-Field	G/F
N12b *	Lo Uk Tsuen	Free-Field	G/F
N13 *	Pui O San Wai Tsuen	Free-Field	G/F
N14 *	South Lantau Community Centre	Free-Field	G/F
N15b *	Pui O Lo Wai Tsuen	Façade	G/F
N16a *	Residences at Ham Tin	Façade	G/F
N16b *	Residences at Ham Tin	Free-Field	G/F
N17 *	Bui O Public School	Façade	R/F

NOTE:

⁺ Fine adjustment of noise monitoring stations at all locations was proposed as per EP Condition 3.1.

* Measurement was conducted at the station in the reporting month.

4.3 Monitoring Date, Time, Frequency and Duration

4.3.1 For daytime construction work on normal weekdays, monitoring of L_eq_(30min) should be carried out at each station at 0700-1900 hours on normal weekdays at a frequency of once a week. Impact monitoring schedule can be referred to Appendix 4.2.

4.4 Noise Monitoring Results

4.4.1 Noise monitoring results measured in this reporting period are reviewed and summarized. Details of noise monitoring results and graphical presentation can be referred in Appendix 4.3.

4.4.2 No action or limit level exceedance was recorded in construction noise level in this reporting period.

5. Water Quality Monitoring

5.1 Monitoring Methodology

Monitoring Procedure

5.1.1 The condition near the monitoring stations shall be observed and recorded on the data log sheet.

5.1.2 Check of sensors and electrodes with certified standard solutions before each use.

5.1.3 Wet bulb calibration for a DO meter should be carried out before measurement.

5.1.4 Water depth should be recorded by detector before sampling.

5.1.5 Sample would be taken using bucket sampler at surface level.

5.1.6 Transfer the sampled water carefully into cleaned water bottles (2x 1000ml) provided by the laboratory at the spot after the collection of the water sample for the subsequent laboratory Suspended Solid testing.

5.1.7 Transfer the sampled water from the bucket sampler to the rinsed water container for in-situ measurement (In case of the in-situ measurement cannot be carried at spot due to safety and adverse weather condition, sampled water from the bucket sampler will be transfer to cleaned water bottles provided by laboratory. Then, In-situ measurement will be conducted at a safe location which sampled water inside cleaned water bottle will be transfer to the rinsed water container for in-situ measurement) In-situ measurement shall be measured in duplicate.

5.1.8 Parameters including Water Temperature (°C), pH (units), Salinity (ppt), DO (mg/L), DO saturation (%), and Turbidity (NTU) will be measured by the Multifunctional Meter. Water Temperature and Salinity will be recorded for reference.

5.1.9 Record the result on the data log sheet and record any special finding during / after in-situ measurement.

5.1.10 The water sample bottles will be stored in a cool box (at cooled to 4°C without being frozen), which shall be delivered to HOKLAS laboratory (ALS Technichem (HK) Pty Ltd) for further testing to determine the level of SS.

Name of Laboratory and Equipment Used and Calibration Details

Laboratory Measurement / Analysis

5.1.11 Analysis of suspended solids will be carried out in a HOKLAS accredited laboratory, ALS Technichem (HK) Pty Ltd.

Equipment Used

Dissolved Oxygen, pH and Temperature Measuring Equipment

5.1.12 Multifunctional Meter are used at each designated monitoring station. They are capable of measuring:

a) a dissolved oxygen level in the range of 0-20mg/L and 0-200% saturation (Detection Limit: 0.1mg/L)

b) a temperature of 0-45 degree Celsius (Detection Limit: 0.1 degree Celsius)

c) turbidity level between 0-1000NTU (Detection Limit: 0.1NTU)

d) salinity in the range of 0-40ppt (Detection Limit: 0.1ppt)

e) pH value in range of 0.0 – 14.0 (Detection Limit: 0.1units)

5.1.13 Other monitoring equipment namely water depth meter, water current meter, dGPS positioning device, water sampler listed below were also deployed,

a) Water depth meter (Range: 0.6 -100m, Resolution: 0.1m)

b) Water current meter (Range: 0-360°, Detection Limit: 1mm/s)

c) dGPS positioning device (Resolution: Horizontal: 0.25m; Vertical: 0.50m)

d) Water sampler (Horizontal discrete type, Capacity: 2.2L)

Sampler Container and Storage

5.1.14 A water sampler, water samples for suspended solids measurement should be collected in high-density polythene bottles, packed in ice (cooled to 4°C without being frozen), and delivered to ALS Technichem (HK) Pty Ltd. as soon as possible after collection for analysis.

Water Depth Detector

5.1.15 A portable, battery-operated echo sounder shall be used for the determination of water depth at each designated monitoring station. This unit can either be handheld or affixed to the bottom of the workboat, if the same vessel is to be used throughout the monitoring programme.

Calibration Details

5.1.16 Maintenance and Calibration

a) The responses of sensors and electrodes of the water quality monitoring equipment were cleaned and checked at regular intervals.

b) The Multifunctional Meter was certified by a laboratory accredited under HOKLAS or any other international accreditation scheme, and subsequently re-calibrated at 3 monthly intervals.

5.1.17 Brand and model of the equipment are given in Table 5.1.

Table 5.1: Water Quality Monitoring Equipment

Equipment

Brand and model

Series Number

Multifunctional Meter

YSI ProDSS

17H105557

21K101469

16H104233

5.1.18 Calibration certificates of the water quality monitoring equipment are attached in Appendix 5.1.

Parameters Monitored

5.1.19 In construction phase, the levels of dissolved oxygen (DO), temperature, turbidity and salinity should be measured in situ while suspended solids (SS) is determined by laboratory analysis.

5.2 Monitoring Stations

5.2.1 Water quality monitoring should be conducted at 9 monitoring stations. The locations of water quality monitoring station are shown in Table 5.2.

Table 5.2: Marine Water Quality Stations for Water Quality Monitoring

Station	Description	Easting	Northing
CE	Upstream control station at ebb tide	810838	807538
CF	Upstream control station at flood tide	815886	808081
SR4 (1)	Ecological Sensitive Receiver (Coral Communities) at Pui O Wan	814938	810975
SR5	Ecological Sensitive Receiver (Coral Communities) at Pui O Wan	814326	810540
SR6	Gazetted Bathing Beach at Lower Cheung Sha	813307	810466
SR9 (1)	Ecological Important Stream at Tong Fuk	811325	809787
SR10	Secondary Contact Recreational Zones at South Lantau	810561	809494
SR12 (1)	Proposed Special Site of Scientific Interest (SSSI) at Shui Hau Wan	810359	808989
SR15	Gazetted Bathing Beach at Pui O and Ecologically Important Stream at Pui O	816037	810722

NOTE:

Fine adjustment of water quality monitoring stations at SR4, SR6, SR9, and SR12 was proposed as per EP Condition 3.1, and baseline monitoring was conducted at corresponding fine adjusted locations.

5.3 Monitoring Date, Time, Frequency and Duration

5.3.1 Baseline Water quality monitoring had been commenced on 12 April 2022 the designated monitoring stations 3 days per week with respect to marine-based construction works commenced on 19 April 2022. HDD casing works commenced on 30 May 2022.

5.3.2 To support water quality monitoring, the silt curtain deployment plan has minor updates to include an additional brand of geosynthetic material as alternative for selection and adopt underwater robot for inspecting condition of silt curtain.

5.3.3 For the upcoming marine works (stage 3 and stage 4), new silt curtain extension to be applied at diffuser and emergency bypass constructions has been proposed and supplemented in the Contract No. SD 15/2022 – Outlying Island Sewerage Stage 2 – South Lantau Sewage Works – Environmental Team Services (2023 – 2024) Monthly EM&A Report (November 2024) 20 EP-538/2017 revised silt curtain deployment plan. Typical details of proposed silt curtain are shown in Figure 5.1.

5.3.4 The levels of dissolved oxygen (“DO”), temperature, turbidity and salinity were measured in situ while suspended solids (“SS”) is determined by laboratory analysis at all the monitoring stations in Table 5.2 3 times a week. Impact monitoring schedule can be referred to Appendix 5.2.

5.3.5 In association with the water quality parameters, other relevant data shall also be recorded, such as monitoring location / position, time, water temperature, DO saturation, weather conditions, and any special phenomena underway near the monitoring station.

5.3.6 Impact Monitoring shall be carried out 3 days per week, at mid-flood and mid-ebb tides (within ± 1.75 hour of the predicted time). The interval between 2 sets of monitoring shall not be less than 36 hours. The monitoring period should avoid concurrent marine project in the vicinity.

5.3.7 The sampling frequency of at least 3 days per week should be undertaken. Upon completion of the construction works, the monitoring exercise at the designated monitoring locations should be continued for 4 weeks in the same manner as the impact monitoring. In case exceedance of Action/Limit Level is recorded, the frequency shall be increased as per the Event and Action Plan.

5.3.8 To ensure the robustness of in-situ measurement, parameters shall be measured in duplicate. In case the difference between duplicates is larger than 25%, a third set of measurement shall be carried out.

Temporary Suspension of Water Quality Monitoring from August 2024 to October 2024

5.3.9 According to the Contractor’s construction programme and confirmed with Engineer Representative, there is no potential marine work until further notice. As such, pursuant to Condition 3.1 of the Environmental Permit No. EP-538/2017, proposal of temporary suspension of impact marine water quality monitoring was submitted to EPD for approval on 12 July 2024. This proposal was reviewed and verified by the Independent Environmental Checker (IEC) on 12 July 2024. The proposal was approved by EPD on 27 August 2024, thus, impact marine water quality monitoring had been temporarily suspended starting from 28 August 2024 and resumed on 7 October 2024.

5.3.10 According to the Contractor’s construction programme, the marine works has been officially commenced on 27 November 2024.

5.4 Monitoring Results

5.4.1 Marine water quality monitoring results measured in this reporting period are reviewed and summarized. Details of marine water quality monitoring results and graphical presentation can be referred in Appendix 5.3.

5.4.2 Water quality monitoring is evaluated against Action and Limit Levels. The derived Action and Limit Level proposed in Baseline Monitoring Report Rev. 9.2 was agreed by EPD on 2 September 2022. Action and Limit Levels of marine water quality monitoring have been set with reference to the derived criteria as shown in Table 5.3 below for reference.

Table 5.3: Action and Limit Levels of Water Quality

Parameters

Action Level

Limit Level

Construction Phase Marine Water Monitoring - derived criteria

DO in mg/L ¹

Surface and Middle: 5.8 mg/L

Bottom: 5.9 mg/L

Surface and Middle: 4 mg/L

Bottom: 2 mg/L

Turbidity in NTU (Depth-averaged ²) ³

14.4 NTU and

20% exceedance of value at any impact station compared with corresponding data from control station ⁴

23.5 NTU and

30% exceedance of value at any impact station compared with corresponding data from control station ⁴

SS in mg/L

(Depth-averaged ²) ³

13.1 mg/L and

20% exceedance of value at any impact station compared with corresponding data from control station ⁴

30.4 mg/L and

30% exceedance of value at any impact station compared with corresponding data from control station ⁴

Notes (with proposed amendments in AL/LL in underlined text):

1: For DO, non-compliance of the water quality limits occurs when monitoring result is lower than the limits.

2: “Depth-averaged” is calculated by taking the arithmetic means of reading of all 3 depths

3: For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

4: Action Level and Limit Level with 95%-ile / 99%-ile derived from baseline data “and” 20% / 30% exceedance of control station proposed in Baseline Monitoring Report.

5.4.3 During the reporting month, no exceedance was recorded.

6. Ecology

6.1 Monitoring Methodology

6.1.1 The weekly site audit to be carried out by the ET should include checking whether good site practices are being properly implemented by the Contractor

6.1.2 Impact monitoring of the transplanted Aquilaris sinensis at holding nursery and 1 retain tree of Aquilaris sinensis in SSWSTW Project Site, establishment and after-establishment caring measures of the compensatory mixed woodland to ensure the affected tree would not be affected by any unacceptable construction works. The trees would be treated with establishment works immediately after transplanting.

6.1.3 Site inspection at the nursery was conducted on 24 February 2025. No Reminder and/or Observation was recorded.

6.2 Parameters Monitored

6.2.1 The extent of the work site boundaries should be checked by the ET during the weekly site audit. Any disturbance by the Contractor outside the works area especially any damage to the vegetation and surrounding habitats outside the Project area shall be reported to ER and IEC.

6.2.2 To identify any unacceptable construction works for the trees of Aquilaris sinensis during transplanting, establishment and after-establishment caring measures of the compensatory mixed woodland.

6.3 Monitoring Location

6.3.1 As per latest version of PTP, 4 tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW (Figure 6.1) which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery (Figure 6.2) at Kam Tin and eventually be transplanted to Pui O Pumping Station.

6.4 Monitoring Date, Time, Frequency and Duration

6.4.1 The recommended good site practices to be audited once every week as part of the site audit programme. The weekly site audit to be carried out by the ET includes checking whether good site practices are being properly implemented by the Contractor. Results are recorded in Weekly Environmental Site Audit Checklist.

6.4.2 Monitoring programme for post-transplantation was conducted on 24 February 2025 once per month.

6.5 Monitoring Results

6.5.1 The weekly site audit was carried out by ET include checking whether good site practices are being properly implemented by the Contractor.

6.5.2 The extent of the work site boundaries was checked by the ET during the weekly site audit.

6.5.3 Results and findings of site audit in this reporting month are listed in Table 3.3.

7. Waste Management

7.1.1 The quantities of waste for disposal in the Reporting Period are summarized in Table 7.1. The Monthly Summary Waste Flow Table is shown in Appendix 7.1.

Table 7.1: Summary of Quantities of Waste Material

Waste Type	Quantity this month	Quantity (the end of last month)	Cumulative Quantity-to-Date
Hard Rock and Large Broken Concrete (Inert), in ‘000m³	0	0	0
Reused in this Contract (Inert),in ‘000m³	0	0	0
Reused in other Projects (Inert), in ‘000m³	0	0	0
Disposal as Public Fill (Inert), in ‘000m³	1.37	1.80	28.41789
Metals (in ‘000kg)	0.0017	0	15.77687
Paper / Cardboard Packing, in ‘000kg	0.0593	0	0.97778
Plastics,in ‘000kg	0.0022	0	0.09996
Chemical Wastes,in ‘000kg	0	0	0
General Refuses, in ‘000kg	16.51	8.62	763.01
Marine Sediment (Type 1 – Open Sea Disposal), m3	0	0	1360.2

NOTE:

The current inert waste disposal record was based on the onsite record from the contractor instead of the official record from the Mui Wo Public Fill Reception Facility due to the maintenance of the weighting bridge.

8. Complaints, Notification of Summons and Prosecution

8.1.1 No environmental complaint was recorded in the reporting month.

8.1.2 No notification of summons and successful prosecution regarding construction works were recorded in the reporting month.

8.1.3 Cumulative statistic on complaints, summary of complaints and successful prosecutions are summarized in Table 8.1, Table 8.2 and Table 8.3 respectively.

Table 8.1: Cumulative Statistics on Complaints

Reporting Period	No. of Complaints
Project commencement to the end of last reporting month	3
This Reporting Month (February 2025)	0
Total:	3

Table 8.2: Summary of Complaints

Date of Notification from EPD	Date of Complaint	Description of Complaint	Validity of Complaint	Close-Out Date / Status
26 May 2022	22 May 2022	A complaint is regarding to noise nuisance from marine site of San Shek Wan, Lantau Island.	Based on the investigation, the works activities of marine works did not result in any noise nuisance to Noise Sensitive Receivers (NSRs), noise nuisance from the Project is unlikely to be valid.	The interim report was submitted to EPD in June 2022. EPD replied no further comments on the final investigation report on 13 July 2022.
23 Dec 2022	21 Dec 2022	A complaint is regarding to the water quality for Pui O Beach, Lantau Island.	Based on the investigation, the works activities at POPS did not result in any water quality impacts to the Pui O Beach.	The interim report was submitted to EPD on 4 Jan 2023.
16 Aug 2024	15 Aug 2024	A complaint is regarding to the damaged silt curtain and potential water quality impact.	Based on the investigation, no marine works since Dec 2023 till present, the land based works activities at POPS did not result in any water quality impacts to the Pui O Wan	The interim report was submitted to EPD on 31 Aug 2024.

Table 8.3: Cumulative Statistics on Successful Prosecutions

Environmental Parameters	Cumulative No. Brought Forward	No. of Successful Prosecutions this month (Offence Date)	Cumulative No. Project-to-Date
Air	-	0	0
Noise	-	0	0
Water	-	0	0
Waste	-	0	0
Other	-	0	0
Total	-	0	0

9. Future Key Issues

9.1.1 In coming reporting 3 months, the scheduled construction activities are listed as follows:

Ø Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;

Ø Excavation and site formation at SSWSTW;

Ø Trenchless drilling works (Chi Ma Wan Road);

Ø Excavation and ELS work at POSPS;

Ø Superstructure RC works at SSWSTW;

Ø Retaining wall construction at SSWSTW;

Ø Dredging and diffuser construction at SSWSTW; and

Ø E&M Installation at POSPS.

9.1.2 The scheduled construction activities and the recommended mitigation measures for the coming 3 months are listed in Table 9.1. The major construction activities for the next 3 months are summarized in 3 Months Rolling Programme – March 2025 to May 2025 in Appendix 9.1

Table 9.1: Construction Activities and Recommended Mitigation Measures in Coming Reporting 3 Months

Key Construction Works

Recommended Mitigation Measures

· Excavation, sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road

· Excavation and site formation at SSWSTW

· Trenchless drilling works (Chi Ma Wan Road)

· Excavation and ELS work at POSPS

· Superstructure RC works at SSWSTW

· Retaining wall construction at SSWSTW

· Dredging and diffuser construction at SSWSTW

· E&M Installation at POSPS

· Implementation of noise pollution control in accordance with Construction Noise Mitigation Plan;

· Dust control during dust generating works;

· Silt curtain should be maintained in good condition prior to and during dredging and related marine works;

· Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;

· Adopt temporary drainage and sediment control facilities on Site;

· Vehicle wheel-washing and body washing facilities should be provided at the site entrance;

· Regular water spraying on excavation works for dust control; and

· Proper waste handling, recycling and storage.

10. Conclusion

10.1 Noise Monitoring

10.1.1 Noise Monitoring has been conducted at 8 of the designated monitoring locations where construction works has been conducted nearby during the reporting month.

10.1.2 No action or limit level exceedance was recorded in construction noise level in this reporting period.

10.2 Water Quality Monitoring

10.2.1 Marine Water Monitoring has been conducted at 9 designated monitoring locations during the reporting month.

10.2.2 No action or limit level exceedances were recorded within the reporting month.

10.3 Ecological Impact Monitoring

10.3.1 Transplanting of the trees of Aquilaris sinensis was completed on 26 April 2022. Maintenance works for trees in holding nursery have commenced.

10.3.2 As per latest version of PTP, 4 tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.

10.3.3 The weekly site audit was carried out by ET include checking whether good site practices are being properly implemented by the Contractor.

10.3.4 The extent of the work site boundaries was checked by the ET during the weekly site audit.

10.3.5 Within this reporting period, holding nursery visit for transplanted trees on 24 February 2025.

10.3.6 No non-compliance was found during the site inspection while reminders on environmental measures were recommended. Results and findings of these inspections in this reporting period are listed below in Table 10.1

Table 10.1: Summary of Ecological Impact Monitoring

Inspection Date	Reminder and Recommendations	Close-out Date / Status
24 February 2025	Nil	--

10.4 Review of the Reasons for and the Implications of Non-compliance

10.4.1 No environmental non-compliance was recorded in the reporting month.

10.5 Summary of Action Taken in the Event of and Follow-Up on Non-Compliance

10.5.1 There was no particular action taken since no non-compliance was recorded in the reporting period.

10.5.2 The performance of the environmental management system of the reporting period was generally satisfied. Mitigation measures according to the environmental mitigation implementation schedule and the EIA were generally implemented by the Contractor. Hence, the EM&A programme was considered effective and shall be maintained.

	Ref	Location Name	Level	Type of Measurement
Location	N12a	Lo Uk Tsuen	G/F	Free-Field

3	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	12:17	12:47	65.1	69.0	43.1	65.6	3.0	68.6	73.3	<Baseline Level	75.0	Dog barks, traffic	Not observed	--
					66.5	70.2	49.6
					63.6	68.8	43.0
					66.4	71.2	44.0
					64.9	69.2	41.7
					66.4	71.9	39.1
15/2/2025	Sunny	Calm	15:55	16:25	64.5	69.1	42.1	66.7	3.0	69.7	73.3	<Baseline Level	75.0	Human activities, dog barks, bird, traffic	Hammering noise	--
					65.9	70.9	42.3
					65.6	69.9	40.7
					68.1	71.7	44.6
					66.3	70.8	42.2
					68.5	72.1	42.1
20/2/2025	Sunny	Calm	10:38	11:08	68.1	73.0	54.6	66.7	3.0	69.7	73.3	<Baseline Level	75.0	Human activities, birds, dog barks, traffic	Drilling noise	--
					66.4	69.8	59.4
					66.7	69.8	49.9
					67.4	70.5	53.9
					65.3	67.6	53.0
					65.4	68.3	51.9
25/2/2025	Cloudy	Calm	09:59	10:29	66.9	71.2	52.4	68.8	3.0	71.8	73.3	<Baseline Level	75.0	Birds, dog barks, traffic	Not observed	--
					71.2	70.1	49.9
					66.6	70.9	52.1
					64.6	69.8	47.3
					68.1	70.9	48.2
					71.3	70.1	47.0

	Ref	Location Name	Level	Type of Measurement
Location	N12b	Lo Uk Tsuen	G/F	Free-Field

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	13:02	13:32	66.3	69.4	46.8	68.3	3.0	71.3	76.8	<Baseline Level	75.0	Human activities, traffic	Not observed	--
					67.8	70.6	44.2
					70.5	72.9	44.6
					66.9	72.7	43.0
					68.0	71.2	47.5
					68.7	73.3	48.5
15/2/2025	Sunny	Calm	15:18	15:48	71.0	74.5	54.9	69.5	3.0	72.5	76.8	<Baseline Level	75.0	Construction Noise from 18/wsd/21, traffic	Not observed	--
					71.6	75.1	53.5
					67.8	71.7	52.1
					68.0	70.8	52.1
					68.5	72.0	51.9
					68.7	73.0	53.6
20/2/2025	Sunny	Calm	11:24	11:54	70.9	73.8	65.8	70.0	3.0	73.0	76.8	<Baseline Level	75.0	Loading/unloading, human activities, birds, dog barks, traffic	Not observed	--
					70.3	72.4	65.5
					71.7	75.9	51.7
					66.9	70.0	49.4
					71.1	73.8	49.8
					66.0	69.1	44.1
25/2/2025	Cloudy	Calm	10:41	11:11	68.9	71.5	66.7	70.8	3.0	73.8	76.8	<Baseline Level	75.0	Construction noise from 18/wsd/21, human activities, birds, traffic	Not observed	--
					70.9	73.3	66.9
					71.3	73.0	67.0
					69.6	72.0	67.1
					70.4	71.5	67.2
					72.6	75.6	67.1

	Ref	Location Name	Level	Type of Measurement
Location	N13	Pui O San Wai Tsuen	G/F	Free-field

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	13:43	14:13	66.7	70.9	54.6	67.5	3.0	70.5	73.6	<Baseline Level	75.0	Human activities, bird, traffic	Not observed	--
					68.0	70.3	53.3
					69.2	72.7	57.7
					68.8	70.0	53.6
					65.0	67.9	55.0
					65.4	69.1	53.8
15/2/2025	Fine	Calm	11:31	12:01	67.4	71.4	50.7	66.6	3.0	69.6	73.6	<Baseline Level	75.0	Birds, traffic	Not observed	--
					68.1	71.8	51.9
					67.1	70.0	51.3
					66.4	71.1	50.0
					65.2	68.8	48.8
					63.9	66.1	48.8
20/2/2025	Sunny	Calm	12:01	12:31	65.8	69.5	46.3	63.4	3.0	66.4	73.6	<Baseline Level	75.0	Renovation works, birds, traffi	Not observed	--
					63.4	67.7	46.2
					62.4	65.7	45.6
					64.0	68.3	45.4
					62.4	67.2	44.9
					60.0	65.9	45.5
25/2/2025	Cloudy	Calm	11:20	11:50	66.3	69.7	60.4	66.8	3.0	69.8	73.6	<Baseline Level	75.0	Renovation, human activities, birds, traffic	Ground breaking noise	--
					65.2	68.2	60.4
					67.6	69.4	59.8
					67.6	71.2	61.2
					66.6	70.0	53.9
					66.9	70.8	54.7

	Ref	Location Name	Level	Type of Measurement
Location	N14	Pui O San Wai Tsuen	G/F	Free-field

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	15:02	15:32	60.1	61.6	52.2	59.2	3.0	62.2	62.2	<Baseline Level	75.0	Human activities, traffic	Not observed	--
					58.7	62.9	50.2
					56.0	58.8	50.4
					54.6	57.2	49.4
					63.4	66.0	49.6
					55.7	57.9	49.5
15/2/2025	Fine	Calm	12:55	13:25	62.2	62.7	58.3	61.5	3.0	64.5	62.2	60.6	75.0	Bird, traffic	Water pump	--
					63.0	62.8	58.2
					59.8	60.1	58.4
					61.9	63.1	58.5
					60.1	61.7	58.5
					61.1	61.2	58.5
19/2/2025	Fine	Calm	12:02	12:32	60.4	59.0	44.1	57.6	3.0	60.6	62.2	<Baseline Level	75.0	Bird, traffic	Not observed	--
					57.2	58.8	43.0
					61.1	62.9	42.9
					50.9	51.5	42.3
					54.5	56.2	44.3
					51.3	53.2	44.3
25/2/2025	Fine	Calm	16:09	16:39	57.7	58.1	44.4	56.3	3.0	59.3	62.2	<Baseline Level	75.0	Human activities, birds, traffic, cows	Not observed	--
					51.7	55.1	45.7
					59.8	60.2	46.9
					55.8	59.3	45.9
					55.7	55.5	43.4
					50.4	52.7	45.5

	Ref	Location Name	Level	Type of Measurement
Location	N15b	Pui O Lo Wai Tsuen	G/F	Façade

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	15:47	16:17	62.3	65.8	55.3	65.2	--	65.2	73.3	<Baseline Level	75.0	Traffic, helicopter	Not observed	--
					66.6	68.2	60.6
					66.4	67.7	64.6
					66.0	67.4	64.8
					65.1	67.6	54.9
					63.4	68.3	55.0
15/2/2025	Fine	Calm	10:53	11:23	61.4	65.7	54.1	65.3	--	65.3	73.3	<Baseline Level	75.0	Traffic, cargo loading/unloadng	Not observed	Road works at 30m
					62.5	65.5	54.1
					64.5	67.8	55.1
					67.2	70.5	60.9
					66.7	69.3	63.7
					66.3	68.4	63.6
20/2/2025	Sunny	Calm	12:42	13:12	61.6	65.6	54.5	61.9	--	61.9	73.3	<Baseline Level	75.0	Traffic, workshop, birds	Not observed	--
					61.8	65.0	54.4
					61.4	66.2	54.8
					60.9	64.3	54.7
					63.0	68.8	54.5
					62.6	66.6	54.2
25/2/2025	Cloudy	Calm	12:57	13:27	61.9	64.9	54.3	61.7	--	61.7	73.3	<Baseline Level	75.0	Construction noise from nearby road works, human activities, dog barks, traffic	Not observed	--
					62.7	65.0	54.5
					61.2	64.7	54.6
					62.6	65.6	54.8
					60.4	65.0	54.5
					60.6	64.3	54.7

	Ref	Location Name	Level	Type of Measurement
Location	N16a	Pui O Lo Wai Tsuen	G/F	Façade

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	17:05	17:35	54.5	58.4	47.1	55.4	--	55.4	76.8	<Baseline Level	75.0	Human activities, traffic, construction noise from other project	Not Observed	--
					54.4	55.9	46.5
					51.4	54.6	44.3
					56.5	60.0	44.2
					56.0	55.4	43.7
					57.5	59.8	44.4
15/2/2025	Sunny	Calm	14:13	14:43	47.4	48.3	38.6	54.7	--	54.7	76.8	<Baseline Level	75.0	Human activities, bird, traffic	Sheet pilling works	--
					47.3	47.8	40.8
					58.9	58.8	40.9
					50.2	52.4	39.7
					56.6	54.5	40.6
					55.2	57.2	41.1
19/2/2025	Sunny	Calm	10:42	11:12	63.3	62.0	44.0	64.1	--	64.1	76.8	<Baseline Level	75.0	Human activities, bird, traffic	Sheet pilling works	--
					58.0	56.3	45.2
					70.4	59.2	42.7
					59.5	62.2	44.5
					55.9	59.4	40.7
					54.5	55.8	44.0
25/2/2025	Fine	Calm	14:43	15:13	59.6	56.7	43.9	58.5	--	58.5	76.8	<Baseline Level	75.0	Renovation works, human activities, birds, traffic	Drilling and machinery noise	--
					53.0	55.2	44.3
					60.7	58.6	44.1
					52.3	52.9	44.3
					58.0	56.9	44.3
					60.7	59.9	44.4

	Ref	Location Name	Level	Type of Measurement
Location	N16b	Residences at Ham Tin	G/F	Free-Field

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	16:30	17:00	53.9	56.9	48.4	55.2	3.0	58.2	73.3	<Baseline Level	75.0	Bird, human activities, traffic	Not observed	--
					52.0	54.9	46.3
					54.1	56.5	49.2
					56.4	60.7	51.0
					55.2	57.9	50.6
					57.5	60.9	52.9
15/2/2025	Fine	Calm	13:37	14:07	54.2	56.8	42.3	51.0	3.0	54.0	73.3	<Baseline Level	75.0	Bird, human activities, traffic	Not observed	--
					49.6	49.9	42.3
					49.2	49.4	40.9
					52.4	55.6	44.4
					50.0	51.7	43.2
					46.3	49.0	40.8
19/2/2025	Sunny	Calm	11:19	11:49	48.7	50.9	45.5	51.0	3.0	54.0	73.3	<Baseline Level	75.0	Birds, traffic	Not observed	--
					50.2	52.2	45.3
					50.2	53.5	44.6
					51.9	54.0	44.7
					51.8	53.6	45.0
					52.2	54.7	45.0
25/2/2025	Fine	Calm	15:25	15:55	53.4	56.1	46.9	51.2	3.0	54.2	73.3	<Baseline Level	75.0	Bird, human activities, traffic	Not observed	--
					51.8	54.4	47.2
					51.8	54.8	47.4
					49.4	51.4	45.0
					50.4	52.0	44.9
					48.5	49.5	44.4

	Ref	Location Name	Level	Type of Measurement
Location	N17	Residences at Ham Tin	G/F	Free-Field

Date	Weather	Wind Condition	Start Time	End Time	Measured Noise Level			Leq30mins	Façade Correction	Corrected Leq30mins	Baseline Level	Construction Noise Level	Limit Level	Noise Sources	Construction Noise	Remarks
					Leq	L10	L90
7/2/2025	Fine	Calm	14:21	14:51	49.6	50.9	43.7	47.6	3.0	50.6	76.8	<Baseline Level	70.0	bird, traffic, A/C system	Not observed	--
					47.1	49.9	43.1
					47.8	50.8	42.9
					46.1	48.4	42.8
					45.8	48.0	42.9
					47.9	50.5	42.6
15/2/2025	Fine	Calm	12:13	12:43	45.7	47.9	39.9	45.2	3.0	48.2	76.8	<Baseline Level	70.0	Dog bark, bird, traffic	Not observed	--
					45.3	47.6	40.3
					46.2	49.4	41.2
					43.6	46.5	39.1
					42.9	45.1	39.0
					46.5	49.6	40.7
19/2/2025	Fine	Calm	12:41	13:11	50.7	54.8	44.3	52.3	3.0	55.3	76.8	<Baseline Level	70.0	Human activities, bird, traffic	Road breaking works at junction	--
					48.5	50.8	45.2
					49.4	50.7	43.7
					55.5	56.2	42.7
					52.0	54.5	44.1
					53.4	56.9	46.6
25/2/2025	Cloudy	Calm	12:02	12:32	49.2	52.8	42.6	48.4	3.0	51.4	76.8	<Baseline Level	70.0	Human activities, birds, traffic	Not observed	--
					50.5	53.9	42.2
					45.1	48.1	41.5
					48.7	50.8	42.6
					48.7	52.1	42.4
					45.8	48.3	42.3

Contract No. CM 04/2024 – Outlying Islands Sewerage Stage 2 – South Lantau Sewerage Works – Environmental Team Services (2025 - 2027)
Monthly Environmental Monitoring and Audit Report for: February 2025 Revision 1
	Certified By: ______________ Ting Po Chung, Ivan Environmental Team Leader Report Date: 13 March 2025