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+Contract No. CM 04/2024 – Outlying Islands Sewerage Stage 2 – South
Lantau Sewerage Works – Environmental Team Services (2025 - 2027) |
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Quarterly Environmental Monitoring, and
Audit Report for: August to October 2025 Revision 1 |
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______________ Ting
Po Chung, Ivan Environmental
Team Leader Report
Date: 24
December 2025 |
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Content:
1.2 Environmental
Monitoring & Audit Programme
1.3 Quarterly
Environmental Monitoring & Audit Report
2. Basic project
Information and Environmental Status
2.3 Works
undertaken during the Reporting quarter
3. Environmental
Monitoring and Audit (“EM&A”) Requirement
3.1 Summary of Monitoring Parameters
3.2 Environmental quality performance
limits (Action and Limit levels); and Results Summary
3.3 Implementation Status of
Environmental Mitigation Measures
3.4 Complaints, Non-Compliance, and Notification of Summons and Prosecution
4.1 Environmental Monitoring and Audits
4.2 Implementation
of Environmental Mitigation Measures
Tables:
Table 2.1: Contact Details of
Key Personnel
Table 3.1: Summary of Impact
EM&A Requirements
Table 3.2: Action and Limit
Levels for Noise Monitoring
Table 3.3: Action and Limit Levels for Water Quality
Table 3.4: Summary of Ecological Impact Monitoring
Table 3.5: Summary of
Quantities of Waste Material in the Reporting Quarter
Figures:
Figure
3.1 Locations of Noise Monitoring
Station
Figure
3.2 Locations of Water Quality Monitoring
Station
Appendices:
Appendix
3.1 Noise Monitoring Graphical
Presentations
Appendix
3.2 Final
Investigation Report
Appendix
3.3 Waste Material in the Reporting
Quarter
This Quarterly Environmental
Monitoring and Audit (“EM&A”) Report summarises 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
quarter from 1 August 2025 to 31 October 2025.
Key Construction
Works in the Reporting quarter
San Shek Wan Sewage
Treatment Works (“SSWSTW”)
·
Excavation and site formation
·
Superstructure Reinforced Concrete (“RC”) works
·
Waterproofing work
Pui O Sewage Pumping
Station (“POSPS”)
·
Excavation and Excavation and Lateral Support (”ELS”) work
·
Electrical and Mechanical (“E&M”)
Installation
Lo Uk Tsuen, Pui O
·
Excavation, sewer laying, construction of
manhole
South Lantau Road
·
Excavation, sewer laying, construction of
manhole
Chi Ma Wan Road
·
Excavation, sewer laying, construction of
manhole
·
Trenchless drilling works
Environmental
Monitoring, and Audit Progress
The EM&A
Programme is implemented in accordance with the EM&A Manual under the EIA
Report. A summary of the monitoring activities during this reporting quarter as
below:
|
Monitoring Activity |
Monitoring Date |
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|
August 2025 |
September 2025 |
October 2025 |
|
|
Noise |
7-8, 11, 22 and 28 |
3-4, 9-10, 15-16 and 25-26 |
6,
9-10, 14-15, 23 and 31 |
|
Water Quality |
N/A |
N/A |
N/A |
|
Nursery visit for transplanted trees |
27 |
22 |
20 |
|
Site Inspection |
4, 11, 18
and 27 |
1, 9, 15, 22 and 30 |
6,
13, 20 and 27 |
Breaches of Action,
and Limit Levels
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
quarter. Should marine works resume, water quality monitoring will be conducted
in accordance with the requirement stipulated in the EM&A Manual
accordingly.
A summary of
environmental exceedances for this reporting quarter is as follows:
|
Environmental
Monitoring |
Parameters |
Action Level |
Limit Level |
|
Noise |
Leq
(30 min) |
0 |
0 |
|
Water
Quality |
Suspended
solids level (“SS”) |
0 |
0 |
|
Turbidity
level |
0 |
0 |
|
|
Dissolved
oxygen level (“DO”) |
0 |
0 |
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.
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
POSPS.
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
On 16 September
2025, the received complaint was related to a reported oil sheen observed in
the wetland area near Pui O Wetland, Lantau Island. On 25 September 2025,
additional information from EPD was received that oil signs spotted in the Pui
O. Subsequent investigations have been conducted.
An unannounced
inspection conducted by ET on 17 September 2025, joint site investigation
conducted by ET and the Contractor on 18 September 2025, and a joint site
investigation conducted by ET, EPD, and the Contractor on 25 September 2025,
and the subsequent site inspection conducted with ET, and Contractor on the
same day. Preliminary findings showed that the diesel drum stored within the
Project Sites were stored properly with no leakage or spillage. No oil signs
within the project sites were found during the inspections conducted throughout
the period of complaint investigation. Also, locations of the identified oil
sheen are not within proximity of the Project Site.
The Final
Investigation Report was submitted to EPD on 17 October 2025. Given that there
is no evidence of oil leakage within our project site, it is considered that
the oil pollution was not caused by our site operations. As such, the case is
considered closed.
No notification of
summons and successful prosecution regarding construction works were recorded
in the reporting quarter.
Reporting Changes
There are no reporting changes in the
reporting quarter.
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.
1.2.1
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
The 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 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).
1.3.1
This Quarterly EM&A Report summarises 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 quarter form August 2025 to October 2025.
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 quarter.
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 |
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|
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 |
2.2.1
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.
2.3.1
In the reporting quarter, the principal work
activities conducted are as follow:
a)
Excavation and site formation
b)
Superstructure Reinforced
Concrete (“RC”) works
c)
Waterproofing work
a) Excavation and Excavation and Lateral Support (”ELS”) work
b)
Electrical and Mechanical (“E&M”) Installation
a)
Excavation, Sewer Laying, and Construction of Manhole
a)
Excavation, Sewer Laying, and Construction of Manhole
a)
Excavation, Sewer Laying, and Construction of Manhole
b)
Trenchless drilling works
3.1.1
The EM&A programme requires environmental monitoring, noise
monitoring, water quality monitoring, and ecology as specified in the approved
EM&A Manual.
3.1.2
A summary of Impact EM&A requirements is presented in Table
3.1. The
locations of noise monitoring stations, and water quality monitoring stations are shown in Figure 3.1 and
Figure 3.2 respectively.
Table 3.1: Summary of Impact EM&A
Requirements
|
Environmental Monitoring Aspects |
Parameters and Unit |
Monitoring Station |
Frequencies |
Remarks |
|
Noise |
Leq
(30mins), L10 (30mins) and L90 (30mins) |
N12a, N12b, N13, N14, N15b, N16a, N16b, and N17 |
At least once per week |
Daytime on normal weekdays (0700-1900 hrs). |
|
Water Quality |
Dissolved Oxygen, mg/L Temperature, °C Salinity, 0/00 Turbidity, NTU Suspended Solids, mg/L pH |
CE, CF, SR4, SR5, SR6, SR9, SR10, SR12, and SR15 |
Three times per week during mid-ebb, and
mid-flood tides |
Samples are collected at 3 depths (1 m below
water, mid-depth, and 1 m above seabed) shall be collected. Where the water depth is less than 6 m, in
which case the mid-depth station may be omitted. Should the water depth be less than 3 m, only
the mid-depth station will be monitored |
3.2.1
A-weighted equivalent continuous sound pressure level (“Leq”) over a period of 30 minutes Leq (30min) shall
be used as the monitoring parameter for construction noise monitoring.
Supplementary information for data auditing, statistical results such as L10,
and L90 should also be recorded for reference.
3.2.2
For impact monitoring of construction works, noise monitoring should be
undertaken on weekly basis. Six consecutive Leq
(5min) between 07:00-19:00 hours on normal weekdays is taken in this
EM&A Programme.
3.2.3
The Action and Limit Levels for noise monitoring are given as in Table 3.2.
No examination was conducted during the
reporting quarter.
Table 3.2: Action and Limit Levels for Noise Monitoring
|
Monitoring Station ID |
Monitoring Location |
Action Level |
Limit Level |
|
N12a |
Lo
Uk Tsuen |
When
one documented complaint is received from any one of the noise sensitive
receivers |
75
dB(A) |
|
N12b |
Lo Uk Tsuen |
75 dB(A) |
|
|
N13 |
Pui O San Wai Tsuen |
75 dB(A) |
|
|
N14 |
South Lantau Community Centre |
75 dB(A) |
|
|
N15b |
Pui O Lo Wai Tsuen |
75 dB(A) |
|
|
N16a |
Residences at Ham Tin |
75 dB(A) |
|
|
N16b |
Residences at Ham Tin |
75 dB(A) |
|
|
N17 |
Bui O Public School |
70 dB(A) / 65 dB(A) 1 |
Note:
1. The Limit Level for N17 is 70 dB(A) for
being an educational institution. The Limit Level is reduced to 65 dB(A) during
school examination period.
3.2.4
No exceedance was recorded for the reporting quarter. The detailed
results and graphical plot for noise monitoring is given in Appendix 3.1.
3.2.5
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 August to October 2025.
3.2.6
Should marine works resume, water quality monitoring will be conducted
in accordance
with
the requirement stipulated in the EM&A Manual accordingly.
3.2.7
Monitoring in the form of regular site inspections should be carried out
to ensure ecological measures in the form of tree transplantation, and
establishment are being implemented, and effective for plant species of
conservation importance (e.g. Aquilaria sinensis).
3.2.8
Transplanting works for plant species, Aquilaris
sinensis, was completed on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
3.2.9
Monitoring of maintenance works for the transplanted plant species was
conducted at the holding nursery while in the reporting period.
3.2.10 As per latest version of
PTP, four 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 POSPS.
3.2.11
Within this reporting
period, holding nursery visit for transplanted trees on 27 August, 22 September and 20
October 2025.
3.2.12
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 3.4.
Table 3.4: Summary of Ecological Impact Monitoring
|
Inspection
Date |
Reminder
and Recommendations |
Close-out
Date / Status |
|
27
August 2025 |
Nil |
-- |
|
22
September 2025 |
Nil. |
-- |
|
20
October 2025 |
Nil. |
-- |
3.2.13
The quantities of waste for disposal in
present quarter are summarized in Table 3.5.
Table 3.5: Summary of
Quantities of Waste Material in the Reporting Quarter
|
Waste Type |
Quantity for Reporting Quarter |
Cumulative Quantity-to-Day |
|
Hard Rock and
Large Broken Concrete (Inert), in ‘000m3 |
0 |
0 |
|
Reused in this Contract (Inert),in ‘000m3 |
0 |
0 |
|
Reused in other Projects (Inert), in ‘000m3 |
0 |
0 |
|
Disposal as Public Fill (Inert), in ‘000m3 |
0.71 |
30.62789 |
|
Metals (in ‘000kg) |
30.9471 |
113.98617 |
|
Paper / Cardboard Packing, in ‘000kg |
0.1704 |
1.37028 |
|
Plastics in ‘000kg |
0.0071 |
0.11216 |
|
Chemical Waste in ‘000kg |
0 |
0 |
|
General Refuse in ‘000kg |
186.51 |
1083.83 |
Note:
The table is summary
of quantities of waste material of August to October period.
3.3.1
The mitigation measures recommended in the
EIA Report has been implemented where applicable. The implemented mitigation
measures for the reporting quarter are listed below:
a)
Implementation of noise mitigation measures
in accordance with Construction Noise Mitigation Plan, including the use of
quality powered mechanical equipment, use of noise barriers, and locating noisy
equipment away from noise sensitive receivers as far as possible;
b)
Dust control during dust generating works,
including watering of construction works site, covering the stockpile stored on
site, provision of wheel-washing facilities for vehicles at the site entrance;
c)
Adopt surface drainage and sediment control
facilities for sewage installation in village and public roads;
d)
Adopt temporary drainage and sediment control
facilities on Site; and
e)
Proper waste handling, recycling and storage.
3.3.2
The implemented mitigation measures are
considered effective.
3.4.1
On 16 September 2025, the received complaint was
related to a reported oil sheen observed in the wetland area near Pui O Wetland, Lantau Island. On 25
September 2025, additional information from EPD was received that oil signs spotted in the Pui O. Subsequent
investigations have been conducted.
3.4.2
An unannounced inspection conducted by ET on 17
September 2025, joint site investigation conducted by ET and the Contractor on 18 September 2025, and a joint
site investigation conducted by ET, EPD, and the Contractor on 25 September 2025, and the subsequent site
inspection conducted with ET, and Contractor on the same day. Preliminary findings showed that the diesel drum
stored within the Project Sites were stored properly with no leakage or spillage. No oil signs within the project
sites were found during the inspections conducted throughout the period of complaint investigation. Also, locations of
the identified oil sheen are not within proximity of the Project Site.
3.4.3
The Final Investigation Report was submitted to
EPD on 17 October 2025. Given that there is no evidence of oil leakage within our project site, it is
considered that the oil pollution was not caused by our site operations. As
such,
the case is considered closed. The Final Investigation
Report is
given in Appendix 3.2.
3.4.4
No notification of summons and successful prosecution regarding
construction works
were
recorded in the reporting quarter.
3.4.5
No environmental non-compliance was recorded in
the reporting quarter.
3.4.6
No notification of summons and successful
prosecution regarding construction works were recorded in the reporting quarter.
4.1.1
Environmental monitoring
and audits including Noise, Water Quality, Ecology, and Site audits have been
conducted in the reporting quarter in accordance with the requirement
stipulated in the EM&A Manua.
Noise Monitoring
4.1.2
Noise Monitoring has
been conducted at 8 of the designated monitoring locations where construction works
has been conducted nearby during the reporting period.
4.1.3
No action or limit
level exceedance was recorded in construction noise level in this reporting period.
Water Quality Monitoring
4.1.4
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 period.
Ecological Impact Monitoring
4.1.5
Transplanting of the trees of Aquilaris
sinensis was completed on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
4.1.6
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.
4.1.7
The weekly site audit was carried out by ET include checking whether
good site practices are being properly implemented by the Contractor.
4.1.8
The extent of the work site boundaries was checked by the ET during the
weekly site audit.
4.1.9
No non-compliance was found during the site
inspection while reminders on environmental measures were recommended.
4.2.1
On 16 September 2025, the received complaint was
related to a reported oil sheen observed in the wetland area near Pui O
Wetland, Lantau Island. On 25 September 2025, additional information from EPD
was received that oil signs spotted in the Pui O. Subsequent investigations
have been conducted.
4.2.2
An unannounced inspection conducted by ET on 17
September 2025, joint site investigation conducted by ET and the Contractor on
18 September 2025, and a joint site investigation conducted by ET, EPD, and the
Contractor on 25 September 2025, and the subsequent site inspection conducted
with ET, and Contractor on the same day. Preliminary findings showed that the
diesel drum stored within the Project Sites were stored properly with no
leakage or spillage. No oil signs within the project sites were found during
the inspections conducted throughout the period of complaint investigation.
Also, locations of the identified oil sheen are not within proximity of the
Project Site.
4.2.3
The Final Investigation Report was submitted to
EPD on 17 October 2025. Given that there is no evidence of oil leakage within
our project site, it is considered that the oil pollution was not caused by our
site operations. As such, the case is considered closed.
4.2.4
No notification of summons and successful
prosecution regarding construction works were recorded in the reporting period.
4.3.1
The mitigation measures recommended in the EIA Report has been
implemented where applicable. The implemented mitigation measures are
considered effective.