|
Contract No. CM 04/2024 – Outlying Islands Sewerage Stage 2 – South
Lantau Sewerage Works – Environmental Team Services (2025 - 2027) |
||
|
Monthly Environmental
Monitoring and Audit Report for: March 2025 |
||
|
|
______________ Ting
Po Chung, Ivan Environmental
Team Leader Report
Date: 11 April 2025 |
|
|
|
|
|
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 and Next Month
Appendix
5.3 Marine
Water Quality Monitoring Results and Graphical Presentations
Appendix 7.1 Monthly
Summary Waste Flow Table
Appendix
9.1 3
Months Rolling Programme
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 March 2025.
In the reporting
month, the principal work activities conducted are as follow:
·
Excavation, sewer laying, construction of
manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;
·
Excavation and site formation at San Shek Wan
Sewerage Treatment Works (“SSWSTW”);
·
Trenchless drilling works at Chi Ma Wan Road;
·
Excavation and Excavation and Lateral Support (”ELS”) work at Pui O Sewage Pumping Station (“POSPS”);
·
Superstructure Reinforced Concrete (“RC”) works
at SSWSTW;
·
Retaining wall construction at SSWSTW;
·
Dredging and diffuser construction at SSWSTW;
and
·
Electrical and Mechanical (“E&M”)
Installation at POSPS.
Noise Monitoring
Noise Monitoring has
been conducted at 8 of the designated monitoring locations where construction
works has been conducted nearby during the reporting month.
No action or limit
level exceedance was recorded in construction noise level in this reporting
period.
Water Quality
Monitoring
Marine Water
Monitoring has been conducted at 9 designated monitoring locations during the
reporting month.
No action or limit
level exceedances were recorded within the reporting month.
Ecological Impact
Monitoring
Transplanting of the
trees of Aquilaris sinensis was
completed on 26 April 2022. Maintenance works for trees in holding nursery have
commenced.
As per latest
version of PTP, 4 tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina
chinensis) within the site of SSWSTW which are considered
to be the plant species with conservative importance for temporarily
transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O
Pumping Station.
The weekly site
audit was carried out by ET include checking whether good site practices are
being properly implemented by the Contractor.
The extent of the
work site boundaries was checked by the ET during the weekly site audit.
Complaints,
Notification of Summons and Prosecution
No environmental
complaint was recorded in the reporting month.
No notification of
summons and successful prosecution regarding construction works were recorded
in the reporting month.
Reporting Changes
There are no
reporting changes in the reporting month.
Future Key Issues
In
coming reporting 3 months, the scheduled construction activities are listed as
follows:
·
Excavation, sewer laying, construction of
manhole at Pui O Lo Uk Tsuen, South Lantau Road, Chi Ma Wan Road;
·
Excavation and site formation at SSWSTW;
·
Trenchless drilling works at Chi Ma Wan Road;
·
Excavation and ELS work at POSPS;
·
Superstructure RC works at SSWSTW;
·
Retaining wall construction at SSWSTW;
·
Dredging and diffuser construction at SSWSTW;
and
·
E&M Installation at POSPS.
Key construction
activities for the next three months with the recommended mitigation measures
to be implemented are presented as follows:
|
Key Construction Works |
Recommended Mitigation Measures |
|
·
Excavation, sewer laying, construction of manhole at Pui O Lo Uk
Tsuen, South Lantau Road, Chi Ma Wan Road ·
Excavation and site formation at SSWSTW ·
Trenchless drilling works at Chi Ma Wan Road ·
Excavation and ELS work at POSPS ·
Superstructure RC works at SSWSTW ·
Retaining wall construction at SSWSTW ·
Dredging and diffuser construction at SSWSTW ·
E&M Installation at POSPS |
·
Implementation of noise pollution control in accordance with
Construction Noise Mitigation Plan; ·
Dust control during dust generating works; ·
Silt curtain should be maintained in good condition prior to and
during dredging and related marine works; ·
Adopt surface drainage and sediment control facilities for sewage
installation in village and public roads; ·
Adopt temporary drainage and sediment control facilities on Site; ·
Vehicle wheel-washing and body washing facilities should be provided
at the site entrance; ·
Regular water spraying on excavation works for dust control; and ·
Proper waste handling, recycling and storage. |
1.1.1
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 March 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 March 2025. His contact details has been updated in Table 2.1.
2.1.3
There are no other
reporting changes in the reporting month.
Table 2.1: Contact
Details of Key Personnel
|
Party |
Role |
Post |
Name |
Contact No. |
Contact Fax |
|
Drainage Services Department |
The Engineer for the Contract |
Engineer |
Mr. KK Chan |
2594 7297 |
3104 6426 |
|
Binnies Hong Kong Limited |
Engineer’s Representative |
Resident Engineer |
Mr. Kevin Chan |
3529 3003 |
- |
|
Kwan Lee – Chun Wo
Joint Venture |
Contractor |
Sub Agent |
Mr. Daniel Chu |
6737 6701 |
2744 6937 |
|
Environmental Supervisor |
Ms. Joey Pang |
6978 2876 |
|||
|
Environmental Supervisor |
Mr. Philip Wong |
6908 8920 |
|||
|
SMEC Hong Kong |
IEC |
IEC |
Ms. Kitty Lee |
3995 8140 |
3422 3631 |
|
Umwelt Consulting Limited |
ET |
ET Leader |
Mr. Ivan Ting |
3756 9590 |
3582 3310 |
2.2.1
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 |
Submission of
Preservation and/or Transplantation Plan for Plant Species of Conservation
Importance (Rev. 23) |
9 September 2022# |
|
2.12 |
Submission of
Compensatory Woodland Planting Plan (Rev. 23) |
15 May 2023^ |
|
2.13 |
Silt Curtain Deployment
Plan (Rev. 11) |
1 June 2022# |
|
2.14 |
Landscape Mitigation Plan |
To be confirmed |
|
2.15 |
Construction Noise
Mitigation Plan (Rev. 20) |
4 August 2022# |
Note:
^ Submission
was made to EPD
# Approval
from EPD was received
3.3.1
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-RS0658-24 |
17 July 2024 |
09 Aug 2024 to |
Expired |
|
GW-RS0084-25 |
28 Jan 2025 |
09 Feb 2025 to |
Valid |
|
|
Construction Noise Permit
under Noise Control Ordinance for POSPS |
GW-RS0856-24 |
17 Sep 2024 |
27 Sep 2024 to |
Expired |
|
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 |
Valid |
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 3, 10, 17, 24, and 31 March
2025. IEC attended the SSEMC meeting held on 17 March 2025. Holding nursery
visit for transplanted trees on 24 March 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 |
|
3 March 2025 |
Pui O Sewage
Pumping Station No Reminder and/or
Observation San Shek Wan Sewage
Treatment Works Reminder 1 The contractor is reminded to remove
standing water from the construction site as soon as possible. |
Contractor has rectified
the reminders on 10 March 2025 |
|
10 Mar 2025 |
Pui O Sewage
Pumping Station Reminder 1 The contractor is reminded to properly
store unused chemicals within the construction site. San Shek Wan Sewage
Treatment Works No
reminder and/or observations |
Contractor has rectified
the reminders on 17 March 2025 |
|
17 Mar 2025 |
Pui O Sewage
Pumping Station Reminder 1: The contractor is reminded to store the
chemical containers properly. Reminder 2: The contractor is reminded to maintain the
housekeeping. San Shek Wan Sewage
Treatment Works Reminder 3: The contractor is reminded to ensure the
waste is properly aggregated and placed within appropriate container
for disposal and/or recycle. |
Contractor has rectified
the reminders on 24 March 2025 |
|
24 Mar 2025 |
Pui O Sewage
Pumping Station No Reminder and/or
Observation San Shek Wan Sewage
Treatment Works No Reminder and/or
Observation Kam Tin Nursery No Reminder and/or
Observation |
N/A |
|
31 Mar 2025 |
Pui O Sewage
Pumping Station Reminder 1: The contractor is reminded to properly sort
waste. San Shek Wan Sewage
Treatment Works Reminder 2: The contractor is reminded to properly
clean up potential containers after use. |
Contractor will rectify
the reminders in the next reporting month. |
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
Monitoring station N17 Bui O Public School is an institutional
sensitive receivers. During the reporting month, no examination was
conducted, as such the construction noise criteria is 70dB(A). During
examination period, which was reported to be May and June 2025, the
construction noise criteria will be revised to 65dB(A) accordingly.
Table 4.2: Noise Monitoring Station
|
Monitoring Station ID + |
Monitoring Location |
Measurement Type |
Level (in terms of no.
of floor) |
|
N01a |
Shui Hau Village |
Free-Field |
G/F |
|
N01c |
Shui Hau Village |
Free-Field |
G/F |
|
N03a |
Tong Fuk Village |
Free-Field |
G/F |
|
N05a |
Residences at Cheung Fu
Street |
Free-Field |
G/F |
|
N07 |
Government Holiday
Bungalows |
Free-Field |
G/F |
|
N08 |
Cheung Sha Ha Tsuen |
Free-Field |
G/F |
|
N10 |
Cheung Sha Sheung Tsuen |
Façade |
G/F |
|
N11b |
San Shek Wan – Ming
Garden |
Free-Field |
G/F |
|
N12a * |
Lo Uk Tsuen |
Free-Field |
G/F |
|
N12b * |
Lo Uk Tsuen |
Free-Field |
G/F |
|
N13 * |
Pui O San Wai Tsuen |
Free-Field |
G/F |
|
N14 * |
South Lantau Community
Centre |
Free-Field |
G/F |
|
N15b * |
Pui O Lo Wai Tsuen |
Façade |
G/F |
|
N16a * |
Residences at Ham Tin |
Façade |
G/F |
|
N16b * |
Residences at Ham Tin |
Free-Field |
G/F |
|
N17 * |
Bui O Public School |
Façade |
R/F |
NOTE:
+ Fine adjustment
of noise monitoring stations at all locations was proposed as per EP Condition
3.1.
* Measurement
was conducted at the station in the reporting month.
4.3.1
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
Sample would be taken using bucket sampler at
surface level.
5.1.6
Transfer the sampled water carefully into
cleaned water bottles (2x 1000ml) provided by the laboratory at the spot after
the collection of the water sample for the subsequent laboratory Suspended
Solid testing.
5.1.7
Transfer the sampled water from the bucket
sampler to the rinsed water container for in-situ measurement (In case of the
in-situ measurement cannot be carried at spot due to safety and adverse weather
condition, sampled water from the bucket sampler will be transfer
to cleaned water bottles provided by laboratory. Then, In-situ measurement will
be conducted at a safe location which sampled water inside cleaned water bottle
will be transfer to the rinsed water container for in-situ measurement) In-situ
measurement shall be measured in duplicate.
5.1.8
Parameters including Water Temperature (°C), pH
(units), Salinity (ppt), DO (mg/L), DO saturation (%), and Turbidity (NTU) will
be measured by the Multifunctional Meter. Water Temperature and Salinity will
be recorded for reference.
5.1.9
Record the result on the data log sheet and
record any special finding during / after in-situ measurement.
5.1.10
The water sample bottles will be stored in a
cool box (at cooled to 4°C without being frozen), which shall be delivered to
HOKLAS laboratory (ALS Technichem (HK) Pty Ltd) for
further testing to determine the level of SS.
5.1.11 Analysis of suspended solids will be carried out in
a HOKLAS accredited laboratory, ALS Technichem (HK)
Pty Ltd.
5.1.12 Multifunctional Meter are
used at each designated monitoring station. They are capable of measuring:
a) a dissolved oxygen level in the range of 0-20mg/L
and 0-200% saturation (Detection Limit: 0.1mg/L)
b) a temperature of 0-45 degree Celsius (Detection
Limit: 0.1 degree Celsius)
c) turbidity level between 0-1000NTU (Detection Limit:
0.1NTU)
d) salinity in the range of 0-40ppt (Detection Limit:
0.1ppt)
e) pH value in range of 0.0 – 14.0 (Detection Limit:
0.1units)
5.1.13 Other monitoring equipment namely water depth
meter, water current meter, dGPS positioning device,
water sampler listed below were also deployed,
a) Water depth meter (Range: 0.6 -100m, Resolution:
0.1m)
b) Water current meter (Range: 0-360°, Detection Limit: 1mm/s)
c) dGPS positioning device (Resolution: Horizontal: 0.25m; Vertical: 0.50m)
d) Water sampler (Horizontal discrete type, Capacity:
2.2L)
5.1.14 A water sampler, water samples for suspended solids
measurement should be collected in high-density polythene bottles, packed in
ice (cooled to 4°C without being frozen), and delivered to ALS Technichem (HK) Pty Ltd. as soon as possible after
collection for analysis.
5.1.15 A portable, battery-operated echo sounder shall be
used for the determination of water depth at each designated monitoring
station. This unit can either be handheld or affixed to the bottom of the
workboat, if the same vessel is to be used throughout the monitoring programme.
5.1.16 Maintenance and Calibration
a) The responses of sensors and electrodes of the
water quality monitoring equipment were cleaned and checked at regular
intervals.
b) The Multifunctional Meter was certified by a
laboratory accredited under HOKLAS or any other international accreditation
scheme, and subsequently re-calibrated at 3 monthly intervals.
5.1.17 Brand and model of the equipment are given in Table 5.1.
Table 5.1: Water
Quality Monitoring Equipment
|
Equipment |
Brand and model |
Series Number |
|
Multifunctional Meter |
YSI ProDSS |
17H105557 21K101469 16H104233 |
5.1.18 Calibration certificates of the water quality
monitoring equipment are attached in Appendix 5.1.
5.1.19 In construction phase, the levels of dissolved oxygen
(DO), temperature, turbidity and salinity should be measured in situ while
suspended solids (SS) is determined by laboratory analysis.
5.2.1
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
During the reporting
month, no exceedance was recorded.
6.1.1
The weekly site audit
to be carried out by the ET should include checking whether good site practices
are being properly implemented by the Contractor
6.1.2
Impact monitoring of
the transplanted Aquilaris sinensis at
holding nursery and 1 retain tree of Aquilaris sinensis
in SSWSTW Project Site, establishment and after-establishment caring measures
of the compensatory mixed woodland to ensure the affected tree would not be
affected by any unacceptable construction works. The trees would be treated
with establishment works immediately after transplanting.
6.1.3
Site inspection at
the nursery was conducted on 24 March 2025. No Reminder and/or Observation 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 24 March 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 |
0.68 |
1.37 |
29.09789 |
|
Metals, in ‘000kg |
0 |
0.0017 |
15.77687 |
|
Paper / Cardboard Packing, in ‘000kg |
0 |
0.0593 |
0.97778 |
|
Plastics, in ‘000kg |
0 |
0.0022 |
0.09996 |
|
Chemical Wastes, in ‘000kg |
0 |
0 |
0 |
|
General Refuses, in ‘000kg |
10.86 |
16.51 |
773.87 |
|
Marine Sediment (Type 1 – Open Sea Disposal), m3 |
0 |
0 |
1360.2 |
NOTE:
The current inert waste disposal record was based on
the onsite record from the contractor instead of the official record from the
Mui Wo Public Fill Reception Facility due to the maintenance of the weighting
bridge.
8.1.1
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
(March 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 at Chi Ma Wan Road;
Ø Excavation
and ELS work at POSPS;
Ø Superstructure
RC works at SSWSTW;
Ø Retaining
wall construction at SSWSTW;
Ø Dredging
and diffuser construction at SSWSTW; and
Ø E&M
Installation at POSPS.
9.1.2
The scheduled construction
activities and the recommended mitigation measures for the coming 3 months are
listed in Table 9.1. The major construction activities for the next 3 months are summarized
in 3 Months Rolling Programme – 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 ·
Dredging and diffuser construction at SSWSTW ·
E&M Installation at POSPS |
·
Implementation of noise pollution control in accordance with
Construction Noise Mitigation Plan; ·
Dust control during dust generating works; ·
Silt curtain should be maintained in good condition prior to and during
dredging and related marine works; ·
Adopt surface drainage and sediment control facilities for sewage
installation in village and public roads; ·
Adopt temporary drainage and sediment control facilities on Site; ·
Vehicle wheel-washing and body washing facilities should be provided
at the site entrance; ·
Regular water spraying on excavation works for dust control; and ·
Proper waste handling, recycling and storage. |
10.1.1 Noise Monitoring has been conducted at 8 of the
designated monitoring locations where construction works has been conducted
nearby during the reporting month.
10.1.2 No action or limit level exceedance was recorded in
construction noise level in this reporting period.
10.2.1 Marine Water Monitoring has been conducted at 9
designated monitoring locations during the reporting month.
10.2.2 No action or limit level exceedances were recorded
within the reporting month.
10.3.1 Transplanting of the trees of Aquilaris
sinensis was completed on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
10.3.2 As per latest version of PTP, 4 tree found (1 no. of
Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW
which are considered to be the plant species with
conservative importance for temporarily transplanted to the nursery at Kam Tin
and eventually be transplanted to Pui O Pumping Station.
10.3.3 The weekly site audit was carried out by ET include
checking whether good site practices are being properly implemented by the
Contractor.
10.3.4 The extent of the work site boundaries was checked
by the ET during the weekly site audit.
10.3.5 Within this reporting period, holding nursery visit
for transplanted trees on 24 March 2025.
10.3.6 No non-compliance was found during the site
inspection while reminders on environmental measures were recommended. Results
and findings of these inspections in this reporting period are listed below in Table 10.1
Table 10.1: Summary of Ecological
Impact Monitoring
|
Inspection Date |
Reminder and
Recommendations |
Close-out Date / Status |
|
24 March 2025 |
Nil |
-- |
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.