CONTRACT NO: SD 15/2022
OUTLYING ISLAND SEWERAGE
STAGE 2 – SOUTH LANTAU SEWAGE
WORKS – ENVIRONMENTAL TEAM SERVICES
(2023 – 2024)
UNDER ENVIRONMENTAL PERMIT NO. EP-538/2017 QUARTERLY ENVIRONMENTAL MONITORING & AUDIT SUMMARY REPORT
AUGUST TO OCTOBER 2024 REVISION 3
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CLIENTS:
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PREPARED BY:
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Drainage Services Department
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Lam Environmental Services Limited
19/F Remex Centre,
42 Wong Chuk
Hang Road, Hong Kong
Telephone: (852) 2882-3939
Facsimile: (852) 2882-3331 E-mail:
info@lamenviro.com
Website: http://www.lamenviro.com
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 CERTIFIED BY:
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Environmental Team Leader Derek Lo
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DATE:
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24 February 2025
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EXECUTIVE SUMMARY
i.
This is the
Quarterly Environmental Monitoring and Audit (EM&A) Summary Report –
August 2024
to October 2024 of Outlying
Islands Sewerage Stage 2
– South Lantau Sewerage Works under Environmental Permit no.
EP-538/2017 (Hereafter as “the Project”). The construction works of the Project was commenced on 3 November 2021 and
the tentative completion date is Q1 2026. The Quarterly EM&A Summary Report
presents the environmental monitoring findings and information recorded during
the period of 1 August to 31 October 2024.
ii.
In the reporting period,
the principal work activities conducted
are as follow:
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August 2024
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September2024
|
October 2024
|
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·
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 Sewage Treatment Works
(SSWSTW) and Pui O
Sewage Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
·
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 Sewage Treatment Works
(SSWSTW) and Pui O
Sewage Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
·
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 Sewage Treatment Works
(SSWSTW) and Pui O
Sewage Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
Exceedances of Action/Limit Levels
Noise Monitoring
iii.
Noise monitoring was conducted at eight (8) noise monitoring stations (N12a, N12b, N13, N14, N15b, N16a, N16b and N17) once per week in the reporting period.
iv.
No school
examination was taken
place at N17 – Bui O Public
School in the reporting period.
v.
No action
and limit level exceedances were recorded in construction noise
level in the reporting
period.
Water Quality
Monitoring
vi.
Marine-based
construction works commenced on 19 April 2022. Water quality
monitoring was conducted at nine (9) monitoring stations
(seven impact & two control
stations) three days per
week in the reporting period starting from 12 April 2022. HDD casing works commenced on 30
May 2022.
vii.
For August
2024, water quality monitoring during mid-flood on 12 August 2024 was cancelled due to Amber Rainstorm Signal
were in force during the scheduled sampling time slots. No substitution would
be arranged for such cancellation since it is impossible to maintain the
monitoring frequency as three times a week for the event of marine water
quality monitoring cancellation in between time with respect to the fact that not less than 36 hours interval shall be followed for two monitoring days as
required by the EM&A Manual Clause 5.1.6 (b) for the project.
viii.
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 on 12
July 2024 for approval. 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 will be temporary suspension
starting from 28 August 2024 until further
notice. Once Contractor and Engineer Representative confirm the actual date
to resume marine work, ET will
notify EPD one month in advance,
and ET will resume impact marine water quality monitoring
two weeks prior to the start of marine works.
ix.
According
to the Contractor’s construction programme and
confirmed with Engineer Representative (Binnies) in September 2024, the marine
works will be commenced on 21 October 2024, ET
notified EPD immediately on 17 September 2024 to resume the marine water
quality monitoring two weeks prior to commencement of marine works, WQM was
resumed from 7 Oct 2024.
x.
Further confirmed
with the Contactor and ER in October 2024, marine works has yet to resume and no
marine work were ongoing in the reporting period.
xi.
In
accordance with the action level and limit level in Baseline Monitoring Report
Rev. 9.2 agreed by EPD on 2 September 2022, 23 action level and 2 limit level
exceedances were recorded in the reporting quarter.
xii.
For October
2024, action level exceedances of Depth-averaged on suspended solids (SS) was recorded at SR9, SR10 and
SR12 from 07:56 to 08:12 during ebb tide on 12 Oct 2024.
Action level exceedances of Depth-averaged on suspended solids (SS) was
recorded at SR5 and SR6 from 9:07 to 9:19 during flood tide as well as at SR10
and SR12 from 14:04 to 14:11 during ebb tide on 21 Oct 2024. Action level exceedances of Depth-averaged on suspended solids (SS) was recorded at SR15 from 13:37 to 13:38 during flood tide on 23 Oct
2024. Limit level exceedances
of Depth-averaged on suspended solids (SS) was recorded at SR4 and SR15 from 09:20 to 09:30 during ebb tide on 28 Oct 2024.
Action level exceedances of Depth- averaged
on suspended solids (SS) was recorded at SR5, SR6, SR9,SR10,
and SR12 from 09:38 to 10:24 during ebb tide
as well as at SR4, SR5, SR6, SR9,SR10, SR12and
SR15 from 16:01 to 17:07 during flood tide on 28 Oct 2024. Action level exceedances of Depth-averaged on suspended solids (SS)
was recorded at SR10 and SR12 during both ebb and flood tide from 11:25 to
11:32 and 16:32 to 16:38
respectively on 30 Oct 2024.
xiii.
As no marine work were ongoing since Jan 2024, no sign of pollution was observed during site
inspection or marine water samples collection, it is considered that the
exceedance was not related to Project works.
xiv.
For
the limit level exceedances of suspended
solid recorded on 28 Oct 2024,
confirmed with our field technician, the seawater was observed turbid during
sampling. As no marine work was conducted in Oct 2024 and no other evidence indicate that the limit level exceedance was affected by the site activities, it can be concluded that the limit level exceedances were possibly induced
by other factors such as natural variation
or changes of water quality in the
vicinity of water quality
monitoring station.
Ecological Impact
Monitoring
xv.
Transplanting
works for plant species, Aquilaris sinensis,
was completed on 26 April 2022. Maintenance works for
trees in holding nursery have commenced.
xvi.
As per latest version of PTP, four tree found (1
no. of Aquilaria sinensis and 3 nos. of Gmelina chinensis) within the site of SSWSTW which are considered
to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O
Pumping Station.
xvii.
The
weekly site audit was carried
out by ET include checking whether good
site practices are being properly implemented by the
Contractor.
xviii.
The extent
of the work site boundaries was checked by the ET during the weekly site audit.
Complaint log
xix.
One
environmental complaint regarding the damaged silt curtain and potential water
quality impact was recorded in the reporting
period. Follow-up site inspection
of silt curtain regarding complaint on damaged silt
curtain and potential water quality impact was conducted by ET, IEC, the
Contractor and RSS on 22 August 2024.
Upon investigation, no marine works since December 2023 till present, the land based works activities at POPS did not result
in any water quality impacts to the Pui O Wan, and it was considered as
non-project related.
Notifications of Any Summons
and Successful Prosecutions
xx.
No environmental notification of any summons
and successful prosecution regarding the
construction works was recorded in present quarter.
1
Introduction
1.1
Scope of the Report
1.1.1.
Lam
Environmental Services Limited (LES) has been
appointed to work as the Environmental
Team (ET) under Environmental Permit
(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 Environmental Impact Assessment (EIA) Report for Outlying Islands
Sewerage Stage 2 - South Lantau Sewerage Works (Register No.:
AEIAR-210/2017).
1.1.2.
The
Quarterly EM&A Summary Report was prepared according to Section 12.3 of the
Project EM&A Manual.
1.2
Structure of the Report
Section 1 Introduction – details the scope and structure
of the report
Section 2 Basic Project Information – a synopsis of project
organization, programme contacts of key management,
and a synopsis of work undertaken in the reporting period.
Section 3 A Brief Summary of EM&A
requirements –
including monitoring parameters, environmental quality
performance limits (Action and Limit levels); and environmental mitigation
measure, as recommended in the EIA Report.
Section 4 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.
Section 5 Monitoring Results
Analysis – the trends of the monitoring parameters in present
quarter; advice on the solid and liquid waste management status.
Section 6 Summary of Non-Compliance (exceedances) of the environmental quality performance limits,
Complaints, Notification of Summons and Successful
Prosecutions
A brief review of the reasons for and the implications of non-compliance and a summary description of the actions taken and any follow-up procedures related to earlier non-compliance.
A summary record
of all complaints received (written
or verbal) for each media,
liaison and consultation undertaken, actions and follow-up procedures taken;
A summary 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 and results.
Section 7 Comments and Recommendations
– such as effectiveness and efficiency of the
mitigation measures, improvement in the EM&A programme,
if any.
Section 8 Conclusion and Project Proponent’s contacts and hotline
telephone number for the public to make enquiries
2.
Basic Project
Information
2.1
Project Organization and Key Contact
Personnel
2.1.1
Drainage
Services Department is the overall project controllers
for the Project. For the construction phase of the Project, Contractor(s),
Environmental Team and Independent Environmental Checker are appointed to
manage and control environmental issues. Key
personnel and contact particulars are summarised in Figure 2.1 and Table
2.1:
Table 2.1 Contact Details
of Key Personnel
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Party
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Role
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Post
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Name
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Contact No.
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Contact Fax
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Drainage Services
Department (DSD)
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The Engineer for the Contract
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Engineer
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Mr. KK Chan
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2594 7297
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3104 6426
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Binnies Hong
Kong Limited
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Engineer’s Representative
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Resident Engineer
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Mr. Kevin Chan
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3529 3013
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-
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Kwan Lee – Chun Wo Joint Venture
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Contractor
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Site Agent
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Mr. Charles
Yeung
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6128 2606
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2744 6937
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Mr. Daniel
Chu*
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6737 6701
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Environmental Officer
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Ms. Shirley
Kong
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5162 5933
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Ms. Hassan
Ka Sin
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6993 0990
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Mr. Rico Chan
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6224 9332
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SMEC Hong Kong
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Independent Environmental Checker (IEC)
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Independent Environmental Checker (IEC)
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Ms. Kitty Lee
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3995 8140
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3995 8101
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Lam Environmental Services Limited
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Environmental Team
(ET)
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Environmental Team Leader
(ETL)
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Mr. Derek Lo
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2882 3939
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2882 3331
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*Site Agent change from Mr. Charles
Yeung to Mr. Daniel Chu starting from October 2024.
2.2
Construction Programme
2.2.1 The proposed sewerage
works will collect the sewage
generated from the unsewered areas of
Shui Hau, Tong Fuk, Cheung Sha, San Shek Wan,
Pui O and Ham Tin in South Lantau (i.e.
within the Project Catchment
Area) and convey it to a proposed sewage treatment works at San Shek Wan for treatment and disposal into outer bay of Pui O/ Chi Ma Wan via a submarine
outfall.
2.2.2
The entire
Project are divided into three contracts. Contract No. DC/2020/20 (the
Contract) would have the following implementations as demonstrated in Figure 2.2.
2.2.3
The major components of the Project under Environmental Permit (EP) (EP No. EP-538/2017) comprises: (i) construction of sewage treatment works at San Shek Wan
(SSWSTW) and associated submarine outfall; (ii) construction of sewage pumping
station at Pui O (POSPS);
(iii) village sewage
works at Pui O; and (iv) trunk sewers and rising mains on carriageways.
3.
A Brief
Summary of EM&A
Requirements
3.1
Monitoring Parameters
Noise Monitoring
3.1.1
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.
3.1.2
For impact monitoring for construction of village
sewers / rising main, noise
monitoring should be
undertaken on weekly basis. One set of Leq (30min)
noise level as six consecutive Leq
(5min) between 07:00-19:00 hours on normal weekdays.
Water Quality Monitoring
3.1.3 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.
Ecological Impact
Monitoring
3.1.4
Monitoring
in the form of regular site inspections should be carried out to ensure
ecological measures in the form of tree transplantation and establishment are
being implemented and effective for plant species of conservation importance
(e.g. Aquilaria
sinensis).
3.2
Environmental Quality
Performance Limits
Noise Monitoring
3.2.1 No action and limit level
exceedances were recorded
in construction noise level in the reporting period.
Water Quality
Monitoring
3.2.2 Marine-based construction works had been commenced since 19 April 2022,
marine water quality monitoring was initialised since
12 April 2022.
3.2.3 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.
3.2.4 For August
2024, water quality monitoring
during mid-flood
on 12 August 2024 was cancelled due to Amber Rainstorm Signal were in force
during the scheduled sampling time slots. No substitution would be arranged for
such cancellation since it is impossible to maintain the monitoring frequency
as three times a week for the event of marine water quality monitoring
cancellation in between time with respect to the fact that not less than 36
hours interval shall
be
followed for two monitoring days as required by the EM&A Manual Clause 5.1.6
(b) for the project.
3.2.5
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 3.1 below.
Table 3.1 Action and Limit Levels
of Water Quality
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Parameters
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Action Level
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Limit Level
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Construction Phase Marine
Water Monitoring - derived criteria
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DO in mg/L B
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Surface and Middle: 5.8 mg/L
Bottom: 5.9
mg/L
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Surface and Middle: 4 mg/L
Bottom: 2 mg/L
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Turbidity in NTU
(Depth-averaged A) C
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14.4 NTU and
20% exceedance of value at any impact
station compared with corresponding
data from control station D
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23.5 NTU and
30% exceedance of value at any impact
station compared with corresponding data from control station D
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SS in mg/L (Depth-averaged A) C
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13.1 mg/L and
20% exceedance of value at any impact station compared with
corresponding data from control station D
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30.4 mg/L and
30% exceedance of value at any impact station compared with corresponding data from control station D
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Notes (with proposed amendments in AL/LL in underlined text):
A. “Depth-averaged” is calculated by taking the arithmetic means of reading of all three
depths.
B. For DO, non-compliance
of the water quality limits occurs when monitoring result
is lower than the limits.
C. For SS and turbidity, non-compliance of the water quality limits occurs when monitoring result
is higher than the limits.
D. 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.
3.2.6 In accordance with the action
level and limit level in Baseline
Monitoring Report Rev. 9.2 agreed by EPD on 2 September
2022, 23 action level and 2 limit level exceedances were recorded in the reporting quarter.
Ecological monitoring
3.2.7 Transplanting works for plant species, Aquilaris sinensis, was completed
on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
3.2.8 Monitoring of maintenance works for the
transplanted plant species was conducted at the holding nursery while in the
reporting period.
3.2.9
As
per latest
version of PTP, four tree found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina
chinensis) within the site of SSWSTW which are considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.
4.
Implementation Status
4.1
Advice on the implementation status of environmental protection and pollution
control/mitigation measures
4.1.1
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.
4.2
Environmental Mitigation Measures
4.2.1
Environmental
mitigation measures mentioned the EIA Report were
weekly reviewed and recorded in Weekly Environmental
Site Audit Checklist. Also, a summary
of the submission status of the reporting quarter on submissions and measures
mentioned in Environmental Permit (EP-538/2017) are shown in Table 4.1.
Table 4.1 Summary of submission status under EP-538/2017
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EP Condition
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Submission
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Date of Latest
Submission to EPD^ / EPD Approval#
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Condition 2.10
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Waste Management Plan
(Rev. 5) (electronic copy)
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4 April 2022#
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Condition 2.11
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Submission of Preservation and/or
Transplantation Plan for Plant
Species of Conservation Importance (Rev. 23)
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9 September 2022#
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Condition 2.12
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Submission of Compensatory Woodland Planting Plan (Rev. 23)
|
15 May 2023^
|
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Condition 2.13
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Silt Curtain Deployment Plan (Rev. 11)
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1 June 2022#
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Condition 2.14
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Landscape Mitigation Plan
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To be confirmed
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Condition 2.15
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Construction Noise Mitigation Plan (Rev. 20)
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4 August 2022#
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4.3
Environmental monitoring requirements and contractual requirements
4.3.1
A summary
of the submission status for the reporting period on licences
and/or permits on environmental protection pertinent to the Project is shown in
Table 4.2.
Table 4.2 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
|
|
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SSWSTW:
WT00039636-2021
|
30 Dec 2021
|
30-12-2021 to 31-12-2026
|
Valid
|
|
Wastewater Discharge Licence
under Water
Pollution Control
|
POPS:
WT00039820-2021
|
31 Dec 2021
|
31-12-2021 to 31-12-2026
|
Valid
|
|
|
|
|
|
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Ordinance
|
SSWSTW: Gravity
|
|
|
|
|
|
Sewer
& Raising Main:
|
09 Jan 2023
|
09-01-2023 to 31-01-2028
|
Valid
|
|
|
WT00042613-2022
|
|
|
|
|
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 -RS0065-24
|
30 Jan 2024
|
09-02-2024 to 08-08-2024
|
Expired in the reporting
period
|
|
GW -RS0658-24
|
17
July 2024
|
09-08-2024 to 08-02-2025
|
Valid
|
|
Construction Noise Permit under Noise Control Ordinance for POSPS
|
GW -RS0213-24
|
15 Mar
2024
|
27-03-2024 to 26-09-2024
|
Expired in the reporting
period
|
|
GW -RS0856-24
|
17 Sep 2024
|
27-09-2024 to 26-03-2025
|
Valid
|
|
Marine Dumping
Permit
|
|
|
|
|
|
(Dredged Sediment Requiring Type
1 – Open Sea Disposal
|
EP/MD/24-060
|
27 Feb 2024
|
01-03-2024 to 31-08-2024
|
Expired in
the reporting
|
|
|
|
|
|
period
|
Note: Only include those valid or under
application; fill in “N/A” for non-applicable item(s).
5.
Monitoring Results
Analysis
5.1
Noise Monitoring
5.1.1 Noise monitoring was conducted at eight (8) noise monitoring stations (N12a, N12b, N13, N14, N15b, N16a, N16b and N17) once per week in the
reporting period.
5.1.2
No school
examination was taken
place at N17 – Bui O Public
School in the reporting period.
5.1.3
Noise monitoring location plans with sensitive receivers are shown in Figure 5.1.
5.1.4 Noise monitoring results measured in the reporting period were reviewed and summarised. Noise monitoring
graphical presentation can be referred to Appendix 5.1.
5.1.5 No action and limit level
exceedances were recorded
in construction noise level in the reporting period.
5.2
Marine Water Quality Monitoring
5.2.1 Marine Water quality monitoring involves nine (9) monitoring stations (seven impact
& two control stations)
three days per week in the reporting period starting
from 12 April 2022.
5.2.2 Marine Water monitoring location plans with sensitive receivers
are shown in Figure 5.2.
5.2.3 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.
5.2.4 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.
5.2.5 For August
2024, water quality monitoring during mid-flood
on 12 August 2024 was cancelled due
to Amber Rainstorm Signal were in force during the scheduled sampling time
slots. No substitution would be arranged for such cancellation since it is
impossible to maintain the monitoring frequency as three times a week for the
event of marine water quality monitoring cancellation in between time with
respect to the fact that not less than 36 hours interval shall be followed for
two monitoring days as required by the
EM&A Manual Clause 5.1.6 (b) for
the project.
5.2.6 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 on 12 July 2024
for approval. 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 will be temporary suspension starting from 28 August 2024 until further notice. Once Contractor and Engineer Representative confirm the actual date to resume marine work, ET will notify EPD one month in advance, and ET will resume impact
marine water quality monitoring two weeks prior to the
start of marine works.
5.2.7 According to the Contractor’s construction programme and confirmed with Engineer Representative
(Binnies) in September 2024, the marine works will be
commenced on 21 October 2024, ET notified EPD immediately on 17 September
2024 to resume the marine water
quality monitoring two weeks prior to commencement of marine works, WQM was
resumed from 7 Oct 2024.
5.2.8 Further
confirmed with the Contactor and ER in October 2024,
marine works has yet
to resume
and no marine work were ongoing in the reporting period.
5.2.9 In accordance with the action level and limit level in Baseline
Monitoring Report Rev. 9.2 agreed by
EPD on 2 September 2022, 23
action level and 2 limit level exceedances
were recorded in the reporting
quarter.
5.2.10 For October 2024,
action level exceedances of Depth-averaged on suspended solids
(SS) was recorded at SR9,
SR10 and SR12 from 07:56 to 08:12
during ebb tide on 12 Oct 2024.
Action level exceedances of Depth-averaged on suspended solids
(SS) was recorded
at SR5 and SR6 from 9:07 to 9:19 during flood tide as well as at SR10 and SR12 from 14:04 to 14:11 during ebb tide on 21 Oct 2024. Action level
exceedances of Depth-averaged on suspended solids (SS) was recorded at SR15
from 13:37 to 13:38 during flood tide on 23 Oct 2024. Limit level exceedances
of Depth-averaged on suspended solids (SS) was recorded at SR4 and SR15 from
09:20 to 09:30 during ebb tide on 28 Oct 2024. Action level exceedances of
Depth- averaged on suspended solids (SS) was recorded at SR5, SR6, SR9,SR10, and SR12 from 09:38
to 10:24 during ebb tide as well as at SR4, SR5, SR6, SR9,SR10, SR12and SR15 from 16:01 to 17:07 during
flood tide on 28 Oct 2024. Action level exceedances of Depth-averaged on suspended solids (SS) was recorded
at SR10 and SR12 during both ebb and flood tide from 11:25 to 11:32 and 16:32 to 16:38
respectively on 30 Oct 2024.
5.2.11 As the suspended solids (SS) result
is determined by laboratory analysis
that require 7 working
days, it is not possible to increase the monitoring frequency to daily until no
exceedance of Action Level after 30 Oct 2024. If such exceedances continuous during marine works
commencement,
ET will check with contractor the implementation of the mitigation measures and
daily WQM monitoring will be considered.
5.2.12 As no marine
work were ongoing
since Jan 2024, no sign of
pollution was observed during
site inspection or marine water samples collection, it is considered that the
exceedance was not related to Project works.
5.2.13 For the limit level exceedances of
suspended solid recorded on 28 Oct 2024, confirmed with our field technician, the seawater was observed turbid
during sampling. As no marine
work was conducted in Oct 2024
and no other evidence indicate that the limit level
exceedance was affected by the site activities, it can be concluded that the limit level exceedances were possibly induced
by other factors such as natural variation or changes of water
quality in the vicinity of water quality monitoring station.
5.3.1
Transplanting
of the trees of Aquilaris sinensis was
completed on 26 April 2022.
Maintenance works for trees in holding nursery have
commenced.
5.3.2
Monitoring
of maintenance works for the transplanted plant species was conducted at the
holding nursery while in the reporting period.
5.3.3
As per latest version of PTP,
four tree
found (1 no. of Aquilaria sinensis and 3 nos. of Gmelina
chinensis) within the site of SSWSTW which are
considered to be the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.
5.4
Waste Management
5.4.1 The quantities of waste for disposal in present quarter are summarized in Table 5.1. The Quarterly Summary Waste Flow Table is shown in
Appendix
5.3.
Table 5.1 Summary of Quantities
of Waste Material (August, September and October
2024)
|
Waste Type
|
Quantity for reporting quarter
|
Cumulative Quantity- to-Date
|
|
Hard Rock and Large Broken
Concrete (Inert)
(in ‘000m3)
|
0
|
0
|
|
Reused in this
Contract (Inert)
(in ‘000m3)
|
0
|
0
|
|
Waste Type
|
Quantity for reporting
quarter
|
Cumulative Quantity- to-Date
|
|
Reused in other Projects (Inert) (in ‘000m3)
|
0
|
0
|
|
Disposal as Public
Fill (Inert)
(in ‘000m3)
|
2.86
|
25.13
|
|
Metals (in ‘000kg)
|
0.0067
|
15.70
|
|
Paper / Cardboard Packing (in ‘000kg)
|
0.0596
|
0.84
|
|
Plastics (in ‘000kg)
|
0.0049
|
0.075
|
|
Chemical Wastes
(in ‘000kg)
|
0
|
0
|
|
General Refuses
(in ‘000kg)
|
43.22
|
683.21
|
|
Marine Sediment (Type
1 – Open Sea Disposal) , m3
|
0
|
60.2
|
6.
Complaints, Notification of Summons and Prosecution
6.1.1
One
environmental complaint regarding the damaged silt curtain and potential water
quality impact was recorded in the reporting period. Follow-up site inspection of silt curtain regarding complaint on damaged silt
curtain and potential water quality impact was conducted by ET, IEC, the Contractor and RSS on 22 August 2024. Upon investigation, no marine works since
December 2023 till present, the land based works
activities at POPS did not result in any water quality impacts to the Pui O Wan, and it was considered as non-project
related.
Table 6.1 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
|
Based on the investigation,
|
The interim report
was
|
|
|
|
regarding noise
|
the works activities of marine
|
submitted to EPD in
|
|
|
|
nuisance from
|
works did not result in any
|
June 2022. EPD
|
|
|
|
marine
site of San
|
noise nuisance to Noise
|
replied no further
|
|
|
|
Shek
Wan, Lantau
|
Sensitive Receivers (NSRs),
|
comments on the final
|
|
|
|
Island.
|
noise nuisance from the
|
investigation report on
|
|
|
|
|
Project is unlikely to be valid.
|
13 July 2022.
|
|
23 Dec 2022
|
21 Dec 2022
|
A complaint is
|
Based on the investigation,
|
The interim report
was
|
|
|
|
regarding to the
|
the works activities at POPS
|
submitted to EPD on 4
|
|
|
|
water quality for Pui
|
did not result
in any water
|
Jan 2023.
|
|
|
|
O Beach, Lantau
|
quality impacts to the Pui O
|
|
|
|
|
Island.
|
Beach.
|
|
|
16 Aug 2024
|
15 Aug 2024
|
A complaint is
|
Based on the investigation,
|
The interim report
was
|
|
2024
|
|
regarding to the
|
no marine works since
Dec
|
submitted to EPD
on
|
|
|
|
damaged silt curtain
|
2023 till present, the land
|
31 Aug 2024.
|
|
|
|
and potential water
|
based works activities at
|
|
|
|
|
quality impact.
|
POPS did not result in any
|
|
|
|
|
|
water quality impacts to the
|
|
|
|
|
|
Pui O Wan.
|
|
6.1.2
No notification of summons and successful prosecution regarding construction
works were recorded in the reporting
period.
6.1.3 Cumulative statistic
on complaints and successful prosecutions are summarized in Table 6.2
and Table 6.3 respectively.
Table 6.2 Cumulative Statistics on Complaints
|
Reporting Period
|
No. of Complaints
|
|
Aug 2024 to Oct 2024
|
1
|
|
Project commencement to the end of last
reporting quarter
|
3
|
|
Total
|
3
|
Table 6.3 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
|
7.
Comments and Recommendations
7.1.1
In the reporting period,
the principal work activities conducted
are as follow.
Table 7.1 Construction Activities in Past 3 Months
|
August 2024
|
September 2024
|
October 2024
|
|
·
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 Sewage Treatment Works
(SSWSTW) and Pui O
Sewage Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
·
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 Sewage Treatment Works
(SSWSTW) and Pui O Sewage
Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
·
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 Sewage Treatment Works
(SSWSTW) and Pui O
Sewage Pumping Station (POSPS)
·
Removal works of Excavation and Lateral Support (ELS)
·
ELS works
·
Superstructure Reinforced Concrete
(RC) Works
·
Electrical and Mechanical (E&M) Installation at POSPS
|
7.1.2 The recommended mitigation measures for the past 3 months are listed below:
·
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 works 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.
The implemented mitigation measures are considered effective.
8.
Conclusion
8.1 Noise Monitoring.
8.1.1 Noise monitoring was conducted at eight (8) noise monitoring stations (N12a, N12b,
N13, N14, N15b, N16a, N16b and N17) once per week in the reporting period.
8.1.2
No school
examination was taken
place at N17 – Bui O Public
School in the reporting period.
8.1.3 No action or limit level exceedance was
recorded in construction noise level in this present quarter.
8.2
Water Quality
Monitoring
8.2.1 Marine-based construction works commenced
on 19 April 2022, water quality monitoring was commenced on 12 April 2022.
8.2.2 For August
2024, water quality monitoring during mid-flood
on 12 August 2024 was cancelled due
to Amber Rainstorm Signal were in force during the scheduled sampling time
slots. No substitution would be arranged for such cancellation since it is
impossible to maintain the monitoring frequency as three times a week for the
event of marine water quality monitoring cancellation in between time with
respect to the fact that not less than 36 hours interval shall be followed for
two monitoring days as required by the
EM&A Manual Clause 5.1.6 (b) for
the project.
8.2.3 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 on 12 July 2024
for approval. 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 will be temporary suspension starting from 28 August
2024 until further notice. Once Contractor and Engineer Representative confirm the actual date to resume marine work, ET will notify EPD one month in advance, and ET will resume impact
marine water quality monitoring two weeks prior to the
start of marine works.
8.2.4 According to the Contractor’s construction programme and confirmed with Engineer Representative
(Binnies) in September 2024, the marine works will be
commenced on 21 October 2024, ET notified EPD immediately on 17 September
2024 to resume the marine water
quality monitoring two weeks prior to commencement of marine works, WQM was
resumed from 7 Oct 2024.
8.2.5 Further
confirmed with the Contactor and ER in October 2024,
marine works has yet
to resume
and no marine work were ongoing in the reporting period.
8.2.6 In accordance with the action level and limit level in Baseline
Monitoring Report Rev. 9.2 agreed by
EPD on 2 September 2022, 23
action level and 2 limit level exceedances
were recorded in the reporting
quarter.
8.3
Ecological Impact Monitoring
8.3.1 Transplanting works for plant species, Aquilaris sinensis, was completed
on 26 April 2022. Maintenance works for trees in
holding nursery have commenced.
8.3.2 Monitoring of maintenance works for the
transplanted plant species was conducted at the holding nursery while in the
reporting period.
8.3.3 As per latest version
of PTP, four tree found (1 no. of Aquilaria sinensis
and 3 nos. of Gmelina chinensis)
within the site of SSWSTW which are considered to be
the plant species with conservative importance for temporarily transplanted to the nursery at Kam Tin and eventually be transplanted to Pui O Pumping Station.
8.4 Review of the Reasons for and the Implications of Non-compliance
8.4.1 No environmental non-compliance was recorded in present quarter.
8.5
Summary of action taken in the event of and follow-up
on non-compliance
8.5.1
There was no particular action taken since no non-compliance was recorded in present quarter.