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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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Monthly Environmental
Monitoring and Audit Report for: May 2025 Revision
4 |
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______________ Ting
Po Chung, Ivan Environmental
Team Leader Report
Date: 13 June 2025 |
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Content:
1.2 Environmental Monitoring & Audit Programme
1.3 Monthly Environmental Monitoring & Audit Report
2. Basic
project Information and Environmental Status
2.3 Works undertaken during the Reporting Month
2.4 Drawing Showing the Project Area, Environmental
Sensitive Receivers and Monitoring Locations
3.2 Environmental Mitigation Measures
3.3 Environmental Monitoring Requirements and Contractual
Requirements
3.4 Site Inspection and Audit Reports
4.3 Monitoring Date, Time, Frequency and Duration
5.3 Monitoring
Date, Time, Frequency and Duration
6.4 Monitoring
Date, Time, Frequency and Duration
8. Complaints,
Notification of Summons and Prosecution
10.3 Ecological
Impact Monitoring
10.4 Review of
the Reasons for and the Implications of Non-compliance
10.5 Summary of Action Taken in the Event of and
Follow-Up on Non-Compliance
Tables:
Table 2.1: Contact Details of Key Personnel
Table 3.1: Summary of Submission Status under
EP-538/2017
Table 3.3: Summary of Environmental Inspections
Table 4.1: Noise Monitoring Equipment
Table 4.2: Noise Monitoring Station
Table 5.1: Water Quality Monitoring Equipment
Table 5.2: Marine Water Quality Stations for
Water Quality Monitoring
Table 5.3: Action and Limit Levels of Water
Quality
Table 7.1: Summary of
Quantities of Waste Material
Table 8.1: Cumulative Statistics on Complaints
Table 8.2: Summary of
Complaints
Table 8.3: Cumulative Statistics on Successful
Prosecutions
Table 9.1: Construction
Activities and Recommended Mitigation Measures in Coming Reporting 3 Months
Table 10.1: Summary of Ecological Impact Monitoring
Figures:
Figure
2.2 Contract Layout Plan
Figure
2.3 Locations of Noise Monitoring
Station
Figure
2.4 Locations of Water Quality
Monitoring Stations
Figure
5.1 Typical Details of Proposed
Silt Curtain
Figure
6.1 Mark up Figure 5.4i extracted
from approved EIA Report (AEIAR-210/2017)
Figure
6.2 Location Plan for Temporary
Holding Nursery
Appendices:
Appendix
4.1 Calibration Certificates for Noise
Meter and Acoustic Calibrator
Appendix
4.3 Noise Monitoring Results and
Graphical Presentations
Appendix
5.1 Calibration Certificates of the Water
Quality Monitoring Equipment
Appendix 5.2 Impact Monitoring Schedule for Construction
Phase Water Quality Monitoring for the Reporting Month
Appendix
5.3 Marine
Water Quality Monitoring Results and Graphical Presentations
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 May 2025.
In the reporting
month, the principal work activities conducted are as follow:
Ÿ Excavation,
sewer laying, construction of manhole at Pui O Lo Uk Tsuen, South Lantau Road,
Chi Ma Wan Road
Ÿ Excavation
and site formation at SSWSTW
Ÿ Trenchless
drilling works (Chi Ma Wan Road)
Ÿ Excavation
and ELS work at POSPS
Ÿ Superstructure
RC works at SSWSTW
Ÿ Retaining
wall construction at SSWSTW
Ÿ Dredging
and diffuser construction at SSWSTW
Ÿ E&M
Installation at POSPS
Noise Monitoring
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 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.
The marine
construction works were completed in May 2025, with the silt curtain removed on
24 May 2025 in accordance with the approved Silt Curtain Deployment Plan.
Action level exceedances were recorded for dissolved oxygen on 17 to 29 May
2025. Investigations have been conducted accordingly and concluded the
exceedances were not project related.
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
There are no
reporting changes in the reporting month.
Future Key Issues
The
construction works scheduled to be conducted in the coming 3 reporting months
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 at Chi Ma Wan Road;
·
Excavation and ELS work at POSPS;
·
Superstructure RC works at SSWSTW;
·
Retaining wall construction at SSWSTW;
·
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 |
|
·
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. |
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
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).
1.3.1
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 May 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.
2.1.1
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 |
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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 |
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 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.
2.4.1
Noise and water monitoring location plans with
sensitive receivers are shown in Figure 2.3 and Figure 2.4
respectively.
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.
3.2.1
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
3.3.1
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 |
Valid |
|
POPS: WT00039820-2021 |
31 Dec 2021 |
31 Dec 2021 to |
Valid |
|
|
SSWSTW: Gravity Sewer & Raising Main:
WT00042613-2022 |
09 Jan 2023 |
09 Jan 2023 to |
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-RS0084-25 |
28 Jan 2025 |
09 Feb 2025 to |
Valid |
|
Construction Noise Permit under Noise Control
Ordinance for POSPS |
GW-RS0310-25 |
26 Mar 2025 |
28 Mar 2025 to 26 Sep 2025 |
Valid |
|
Marine Dumping Permit (Dredged Sediment Requiring
Type 1 – Open Sea Disposal |
EP/MD/25-024 |
19 Nov 2024 |
19 Nov 2024 to |
Expired since 19 May 2025 |
Note: Only valid permits or permits under applications
within the reporting month are included.
3.4.1
Within this reporting month, weekly
environmental site inspections were conducted on 7, 12, 19 and 27 May 2025. IEC
attended the SSEMC meeting held on 19 May 2025. The ET and contractor
participated in the holding nursery visit for transplanted trees on 27 May
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 |
|
7 May 2025 |
Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works No Reminder and/or Observation |
N/A |
|
12
May 2025 |
Pui O Sewage Pumping Station Reminder 1 The contractor is reminded to instruct
workers to sort waste properly. San Shek Wan Sewage Treatment Works No reminder and/or
observations |
Contractor has rectified
the reminders on 19 May 2025 |
|
19
May 2025 |
Pui O Sewage Pumping Station No reminder and/or observations San Shek Wan Sewage Treatment Works Reminder 1: The contractor is reminded to properly store the
chemicals on site. Reminder 2: The contractor is reminded to properly maintain site
cleanliness. |
Contractor has
rectified the reminders on 26 May 2025 |
|
27 May 2025 |
Pui O Sewage Pumping Station No Reminder and/or Observation San Shek Wan Sewage Treatment Works Reminder 1: The contractor is reminded to instruct workers to
sort waste properly. Kam Tin Nursery Reminder 2: The
contractor is reminded to clear tree weeds. |
Contractor has rectified the reminders on 2 June 2025 |
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.
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.
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.
4.1.12
The construction noise level shall be measured
in terms of the A-weighted equivalent continuous sound pressure level (“Leq”). Leq(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 Leq(30min) noise level as 6 consecutive Leq(5min)
between 07:00-19:00 hours on normal weekdays has been taken.
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
During the reporting period, school examinations were held from 15 to 16
May 2025. Accordingly, the noise limit for monitoring station N17-Bui O Public
School was temporarily reduced to 65 dB(A) on these examination days (15-16 May
2025). The standard noise limit of 70 dB(A) remained applicable for all other
days outside this examination period.
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.
4.3.1
For daytime construction work on normal
weekdays, monitoring of Leq(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.
4.4.1
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.
5.1.1
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
A water sampler, consisting of a PVC or glass
cylinder of not less than two litres, which can be effectively sealed with cups
at both ends, will be used for water sampling. The water sampler will have a
positive latching system to keep it open and prevent premature closure until
released by a messenger when the sampler is at the selected water depth.
5.1.6
Transfer the collected water carefully into
cleaned water bottles (2x 1000ml) provided by the laboratory at the spot for
the subsequent laboratory Suspended Solid testing.
5.1.7
Parameters including Water Temperature (°C), pH
(units), Salinity (ppt), DO (mg/L), DO saturation (%), and Turbidity (NTU) will
be measured in-situ by the Multifunctional Meter. Water Temperature and
Salinity will be recorded for reference.
5.1.8
Record the result on the data log sheet and
record any special finding during / after in-situ measurement.
5.1.9
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 Suspended Solids (“SS”).
5.1.10 Analysis of suspended solids will be carried out in
a HOKLAS accredited laboratory, ALS Technichem (HK)
Pty Ltd.
5.1.11 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)
5.1.12 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)
5.1.13 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.
5.1.14 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.
5.1.15 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.
5.1.16 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 |
21K101469 16H104233 |
5.1.17 Calibration certificates of the water quality
monitoring equipment are attached in Appendix 5.1.
5.1.18 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.
5.2.1
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.
5.3.1
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.
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.
5.4.1
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
Action level exceedance was record for
dissolved oxygen on 17 to 29 May 2025. Investigations were conducted and site investigation
was conducted on 30 May 2025.
5.4.4
Marine works were
completed on 24 May 2025. Marine works of casing removal was conducted on 24
May 2025. The silt curtain was then removed on the same day in accordance with
the site curation deployment plan. No other marine works were conducted in May
2025. Table 5.4 summarizes the exceedances events and respective investigation
findings.
Table 5.4: Exceedances
Events and Investigation Findings
|
Exceedances |
Monitoring stations |
Conclusion |
Justification |
|
17 May 2025 – Dissolved Oxygen |
SR9-Ebb and Flood Tide |
Not project related |
SR9 is located too far away from the marine works
site. |
|
20 May 2025 – Dissolved oxygen |
SR4-Flood Tide SR9-Flood Tide |
Not project related |
No marine works were conducted during the water
quality monitoring. No abnormalities observed during water quality
monitoring. |
|
22 May 2025 – Dissolved oxygen |
SR4-Ebb Tide SR5-Ebb and Flood Tide SR9-Flood Tide |
Not project related |
No marine works were conducted during the water
quality monitoring. No abnormalities observed during water quality
monitoring. |
|
24 May 2025 – Dissolved oxygen |
SR5-Ebb Tide SR9-Flood Tide |
Not project related |
Marine works conducted on 24 May 2025 would not have
introduced pollutants that would affect Dissolved Oxygen. |
|
27 May 2025 – Dissolved oxygen |
SR4-Ebb and Flood Tide SR5-Ebb and Flood Tide SR9-Ebb and Flood Tide |
Not project related |
No marine works were conducted during the water
quality monitoring. No abnormalities observed during water quality
monitoring. |
|
29 May 2025 – Dissolved oxygen |
SR4-Ebb and Flood Tide SR5 -Ebb and Flood Tide SR6 -Flood Tide SR9-Ebb and Flood Tide SR15-Flood Tide |
Not project related |
No marine works were conducted during the water
quality monitoring. Abnormalities in seawater were observed during site
investigation conducted on 30 May 2025, which is suspected to be algae bloom. |
5.4.5
As the exceedances
would due to natural fluctuation, and the marine works have been completed.
Hence, the water quality monitoring was not extended in spite of the exceedance
recorded on 29 May 2025.
5.4.6
Water quality monitoring
programme is completed in May 2025, should marine works would be resumed, water
quality monitoring programme will resume accordingly.
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 27 May 2025. One reminder was recorded.
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.
6.3.1
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.
6.4.1
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 27 May 2025 once per month.
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.
7.1.1
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 |
0.07 |
0.39 |
29.48789 |
|
Metals, in ‘000kg |
10.59 |
0.0069 |
15.78377 |
|
Paper / Cardboard Packing, in ‘000kg |
0 |
0.0528 |
1.03058 |
|
Plastics, in ‘000kg |
0 |
0.0002 |
0.10016 |
|
Chemical Wastes, in ‘000kg |
0 |
0 |
0 |
|
General Refuses, in ‘000kg |
29.07 |
25.38 |
799.25 |
|
Marine Sediment (Type 1 – Open Sea Disposal), m3 |
0 |
0 |
1360.2 |
NOTE:
The inert waste disposal record up to 7 April 2025 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. The subsequent inert waste disposal record will adopt the
recorded weight at the Mui Wo Public Fill Reception Facility.
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 (May
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 |
9.1.1
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 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 – April 2025 to June 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 ·
E&M Installation at POSPS |
·
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. |
10.1.1 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 During the reporting period, school examinations
were held from 15 to 16 May 2025. Accordingly, the noise limit for monitoring
station N17-Bui O Public School was temporarily reduced to 65 dB(A) on these
examination days (15-16 May
2025). The standard noise limit
of 70 dB(A) remained applicable for all other days outside this examination
period.
10.1.3 No action or limit level exceedance was recorded in
construction noise level in this reporting period.
10.2.1 Marine Water Monitoring has been conducted at 9
designated monitoring locations during the reporting month.
10.2.2 Action
level exceedance was record for dissolved oxygen on 17 to 29 May 2025.
Investigations were conducted and site investigation was conducted on 30 May 2025.
10.2.3 Marine works were completed on 24 May 2025. The
silt curtain was removed
and cutting of casing on the same day in
accordance with the site curation deployment plan. No other marine works were
conducted in May 2025.
10.2.4 As the exceedances would be due to natural
fluctuation, and the marine works have been completed. Hence, the water quality
monitoring was not extended in spite of the exceedance recorded on 29 May 2025.
10.2.5 Water quality program is completed in May 2025,
unless marine works would be resumed.
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 27
May 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 |
|
27 May 2025 |
The
contractor is reminded to clear the weeds. |
In Section 3.4.2: to be
verified in next inspection |
10.4.1 No environmental non-compliance was recorded in the
reporting month.
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.