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 December 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) Trenchless drilling works (Chi Ma Wan Road);

c) Excavation and ELS work at POSPS;

d) Superstructure RC works at SSWSTW;

e) Waterproofing Work at SSWSTW;

f) Excavation and Site formation at SSWSTW;

g) E&M Installation at POSPS; and

h) E&M Installation at SSWSTW

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 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	Preservation and/or Transplantation Plan for Plant Species of Conservation Importance (Rev. 23)	9 September 2022#
2.12	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-RS0836-25	13 Aug 2025	15 Aug 2025 to 12 Feb 2026	Valid
Construction Noise Permit under Noise Control Ordinance for POSPS	GW-RS0993-25	18 Sep 2025	27 Sep 2025 to 26 Mar 2026	Valid
Construction Noise Permit under Noise Control Ordinance for Chi Ma Wan Road	GW-RS0834-25	13 Aug 2025	15 Aug 2025 to 12 Feb 2026	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 1, 8, 15, 23 and 30 December 2025. IEC attended the SSEMC meeting held on 15 December 2025. The ET and contractor participated in the holding nursery visit for transplanted trees on 15 December 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
24 November 2025	Pui O Sewage Pumping Station Reminder1: The contractor is reminded to improve site tidiness. San Shek Wan Sewage Treatment Works Reminder1: The contractor is reminded to provide adequate watering for haul roads.	Contractor has rectified the reminders on 1 December 2025
1 December 2025	Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works No Reminder and/or Observation	N/A
8 December 2025	Pui O Sewage Pumping Station Reminder 1: The contractor is reminded to regular water spraying on exposed area. Reminder 2: The contractor is reminded to properly install the tree tag. San Shek Wan Sewage Treatment Works Reminder 1: The contractor is reminded to regular water spraying on exposed area.	Contractor has rectified the reminders on 15 December 2025
15 December 2025	Pui O Sewage Pumping Station Reminder 1: The contractor is reminded to avoid blockage of permits and licenses at the entrance of the site. San Shek Wan Sewage Treatment Works No Reminder and/or Observation Kam Tin Nursery No Reminder and/or Observation	Contractor has rectified the reminders on 22 December 2025
23 December 2025	Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works No Reminder and/or Observation	N/A
30 December 2025	Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works No Reminder and/or Observation	N/A

Note: The reminders given in the last reporting month on 24 November 2025 were rectified in the reporting month.

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
Integrated Sound Level Meter	Rion - NL-53	452008	23 Apr 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 (“L_eq”). 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 receiver. During the reporting month, no examination was conducted, as such the construction noise criteria is 70dB(A).

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.

Exceedances Recorded in the Reporting Month

4.4.2 Noise limit level exceedance of 75 dB(A) was recorded at N12a on 24 December 2025. Site observation recorded a breaker was operating at a roadside works site on South Lantau Road was observed during monitoring. Also, local traffic noise, that comprises of heavy vehicles including trucks and buses, was observed to be high. As such, the exceedance would be due to combination of construction works and traffic flow. Hence, it is considered that the exceedance maybe project-related.

4.4.3 Repeat monitoring was conducted on 30 December 2025 due to no construction works during the public holidays on 25–26 December. Corrected noise level of 72dB(A) at N12a was recorded. Site investigation conducted on 30 December 2025 observed that no beaker was in operation at the work site. Corresponding remedial actions, including reminding the Contractor to maintain vigilance over construction noise, and formalizing the mandatory erection of noise barriers for future concrete breaking activities to prevent the recurrence of similar incidents, have been implemented. The Investigation report is being prepared and will be reported in the next reporting month EM&A Report.

5. Water Quality Monitoring

5.1 Completion of Water Quality Monitoring

5.1.1 Subsequent to the completion of marine work on 24 May 2025, water quality monitoring was considered completed by 30 May 2025. No water quality monitoring is conducted in this reporting month.

5.1.2 Should marine works resume, water quality monitoring will be conducted in accordance with the requirement stipulated in the EM&A Manual accordingly.

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 15 December 2025. No reminder 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 trees 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 15 December 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	0.14	0.06	30.82789
Metals, in ‘000kg	10.5817	0.0037	124.5716
Paper / Cardboard Packing, in ‘000kg	0.0365	0.0530	1.45978
Plastics, in ‘000kg	0.0019	0.0051	0.11916
Chemical Wastes, in ‘000kg	0	0	0
General Refuses, in ‘000kg	84.88	70.95	1239.66
Marine Sediment (Type 1 – Open Sea Disposal), m³	0	0	1360.2

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	4
This Reporting Month (December 2025)	0
Total:	4

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.
16 Sep 2025	16 Sep 2025	A complaint is regarding to oil sheen observed at Pui O Wetland, Lantau Island.	Based on the investigation, no evidence of oil leakage within our project site, it is considered that the oil pollution would not due to our site operation. As such the case is considered closed.	The Final Investigation Report was submitted to EPD by 17 Oct 2025.

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 Waterproofing Work at SSWSTW

Ø Retaining wall construction at SSWSTW

Ø Slope Work at along the Slope near SSWSTW

Ø E&M Installation at POSPS

Ø E&M Installation at SSWSTW

Ø ABWF work at POSPS

Ø ABWF work at SSWSTW

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 – February 2026 to April 2026 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

· Waterproofing Work at SSWSTW

· Retaining wall construction at SSWSTW

· Slope Work at along the Slope near SSWSTW

· E&M Installation at POSPS

· E&M Installation at SSWSTW

· ABWF work at POSPS

· ABWF work at SSWSTW

· Prevention of site runoff during heavy rainstorms.

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

· Dust control during dust generating 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 Noise limit level exceedance of 75 dB(A) was recorded at N12a on 24 December 2025. Site observation recorded a breaker was operating at a roadside works site on South Lantau Road was observed during monitoring. Also, local traffic noise, that comprises of heavy vehicles including trucks and buses, was observed to be high. As such, the exceedance would be due to combination of construction works and traffic flow. Hence, it is considered that the exceedance maybe project-related.

10.1.3 Repeat monitoring was conducted on 30 December 2025 due to no construction works during the public holidays on 25–26 December. Corrected noise level of 72dB(A) at N12a was recorded. Site investigation conducted on 30 December 2025 observed that no beaker was in operation at the work site. Corresponding remedial actions, including reminding the Contractor to maintain vigilance over construction noise, and formalizing the mandatory erection of noise barriers for future concrete breaking activities to prevent the recurrence of similar incidents, have been implemented. The Investigation report is being prepared and will be reported in the next reporting month EM&A Report.

10.2 Water Quality Monitoring

10.2.1 Subsequent to the completion of marine work on 24 May 2025, water quality monitoring was considered completed by 30 May 2025. No water quality monitoring is conducted in this 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 trees 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 15 December 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
15 December 2025	Nil	--

10.4 Review of the Reasons for and the Implications of Non-compliance (exceedance)

10.4.1 The detail of the reasons for and the implications of exceedance has been discussed in Section ‎10.1.2.

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

10.5.1 The detail of action taken in the event of and follow- up on exceedance has been discussed in Section ‎10.1.3.

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.

10.6 Complaints, Notification of Summons and Prosecution

10.6.1 No complaints were recorded in the reporting month.

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

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: December 2025 Revision 6
	Certified By: ______________ Ting Po Chung, Ivan Environmental Team Leader Report Date: 15 January 2026