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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: February to April 2026 Revision 1 |
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Certified
By: ______________ Lau Hoi Wai,
Josephine Environmental
Team Leader Report
Date: 26
May 2026 |
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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 2.1 Master Layout
Plan
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 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 February to 30 April 2026..
Key Construction
Works in the Reporting quarter
San Shek Wan Sewage
Treatment Works (“SSWSTW”)
·
Superstructure Reinforced Concrete (“RC”) works
·
Waterproofing Work
·
Excavation and Site formation
·
E&M Installation
·
Slope Work near SSWSTW
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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|
February 2026 |
March 2026 |
April 2026 |
|
|
Noise |
3,
9, 20 and 26 |
4-5,
10, 16 and 27 |
2-3,
8, 14, 21 and 29-30 |
|
Nursery visit for
transplanted trees |
23 |
23 |
20 |
|
Site Inspection |
2,
9, 16 and 23 |
2,
9, 16 and 30 |
10,
13, 20 and 27 |
Breaches of Action,
and Limit Levels
Noise Monitoring has
been conducted at 8 of the designated monitoring locations (N12a, N12b, N13,
N14, N15b,
N16a, N16b, and N17)
where construction works has been conducted nearby during the reporting
quarter.
No action or limit
level exceedance was recorded in construction noise level in this reporting
quarter.
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 |
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
No notification of summons
and successful prosecution regarding construction works were recorded in the
reporting quarter.
Reporting Changes
Ms Lau Hoi Wai, Josephine has replaced Mr.
Ting Po Chung, Ivan as the Environmental Team Leader of the subject
project with effect from 1 March 2026. Her
contact details have been updated in Table 2.1.
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 from February to April 2026.
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
Sewerage Works – Environmental Team Services (2023 – 2024), the subsequent
contract, Contract No. CM 04/2024 Outlying Island Sewerage Stage 2 – South
Lantau Sewerage Works – Environmental Team Services (2025 – 2027), was awarded to
Umwelt Consulting Limited (“UCL”). Mr Ting Po Chung, Ivan was appointed as the
environmental team leader (“ETL”) for the Project with effect from 1 February
2025. With effect from 1 March 2026, Mr. Ting Po Chung, Ivan ceased to be
the ETL and was replaced by Ms Lau Hoi Wai, Josephine as the Environmental Team
Leader (“ETL”) of the subject project. Her contact details have 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 |
3965 8202 |
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 |
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Environmental Supervisor |
Ms. Joey Pang |
6978 2876 |
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Environmental Supervisor |
Mr. Philip Wong |
6908 8920 |
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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 |
|
Ms. Josephine Lau |
Remake:
Mr. Ting Po Chung, Ivan served as ETL from 1 February 2025 to 28
February 2026. He was succeeded by Ms. Josephine Lau with effect from 1 March
2026.
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:
Pui O Sewage Pumping Station (“POSPS”)
South Lantau Road
Chi Ma Wan Road
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 quarter 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. During the reporting period, school examinations were held from 2 to 6
and 9 to 11 March 2026. Accordingly, the noise limit for monitoring station N17
Bui O Public School was temporarily reduced to 65 dB(A) remained applicable for
all other days outside this examination period.
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 quarter.
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.
Water Quality
Monitoring
Completion of Water Quality
Monitoring
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 was conducted
during the reporting quarter. Should
marine works resume, water quality monitoring will be conducted in accordance with
the requirement stipulated in the EM&A Manual accordingly.
Ecological Impact
Monitoring
3.2.6
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).
3.2.7
Transplanting works for plant species, Aquilaris
sinensis, was completed on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
3.2.8
Monitoring of maintenance works for the transplanted plant species was
conducted at the holding nursery while in the reporting quarter.
3.2.9
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.
3.2.10
Within this reporting
quarter, holding nursery visit for transplanted trees on 23
February, 23 March and 20 April 2026
3.2.11
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
quarter are listed below in Table 3.4.
Table 3.4: Summary of Ecological Impact Monitoring
|
Inspection
Date |
Reminder
and Recommendations |
Close-out
Date / Status |
|
23
February 2026 |
The
contractor is reminded to remove weeds. |
Contractor
has rectified the reminders on 13 March 2026 |
|
23
March 2026 |
Nil |
-- |
|
20
April 2026 |
The
contractor is reminded to remove weeds. |
Contractor
has rectified the reminders on 27 April 2026 |
3.2.12
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 |
0.21 |
31.608 |
|
Metals (in ‘000kg) |
8.304 |
142.259 |
|
Paper / Cardboard Packing, in
‘000kg |
0.173 |
1.692 |
|
Plastics in ‘000kg |
0.006 |
0.128 |
|
Chemical Waste in ‘000kg |
0.36 |
0.36 |
|
General Refuse in ‘000kg |
175.22 |
1529.21 |
Note:
The table is summary
of quantities of waste material of February to April 2026 quarter.
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)
Prevention of site runoff during heavy rainstorms;
b)
Implementation of noise pollution control in accordance with Construction Noise Mitigation Plan;
c)
Dust control during dust generating works;
d)
Vehicle wheel-washing and body washing
facilities should be provided at the site entrance;
e)
Adopt surface drainage and sediment control facilities for sewage installation in village and public roads;
f)
Adopt temporary drainage and sediment control facilities on Site;
g)
Regular water spraying on excavation works for dust control; and
h)
Proper waste handling, recycling and storage.
3.3.2
The implemented mitigation measures are
considered effective.
3.4.1
No environmental complaint was recorded in the
reporting quarter.
3.4.2
No environmental non-compliance was recorded in the
reporting quarter.
3.4.3
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 quarter.
4.1.3
No action or limit level exceedance was recorded in construction noise
level in this reporting quarter.
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 quarter.
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
No environmental complaint, notification of
summons and successful prosecution regarding construction works were recorded
in the reporting quarter.
4.3.1
The mitigation measures recommended in the EIA Report has been
implemented where applicable. The implemented mitigation measures are
considered effective.