Introduction
1.
This is the 20th Monthly Environmental Monitoring
and Audit (EM&A) Report prepared by the
Environmental Team (ET), Cinotech Consultants Ltd., for
Contract No. HATS 01/2025 “Environment
Team for Hung Shui Kiu Effluent Polishing Plant – Phase 1” (hereinafter called
“the Project”. This report documents the findings of the EM&A programme under the issued EP No. EP-608/2022/A, and in accordance with the requirements specified in the
EM&A Manual during the
reporting period from 1 April 2026 to 30 April 2026.
2.
The major site activities undertaken in the reporting period are shown in Table I.
Table I Major Site Activities in the
Reporting Period
|
Contract No.
|
Contract
Title
|
Site
Activities
|
|
DC/2024/11
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – Civil Works
|
l Temporary Drainage Construction
l Erection of the site office
l
Driven H-piling
|
|
DE/2024/09
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – E&M Works and
Biological Treatment Building
|
l
Erection
of the site office
|
Environmental
Monitoring Works and Audit
3.
Environmental monitoring for
the Project had been performed in accordance with the EM&A Manual, and the monitoring results were checked and reviewed. Site
Inspections/Audits shall be conducted once per week. The weekly site inspection was conducted on 2, 10, 17, 24 and 30 April 2026 in the reporting month. IEC
joint site inspection was conducted on 10 April 2026. The implementation of
the environmental mitigation measures, Event Action Plans and environmental
complaint handling procedures, including the items responsible by the ET, was also checked.
4.
The
summary of exceedances in the reporting period for
the Project is tabulated in Table II.
Table II Exceedance Record for the Project in
the Reporting Period
|
Item
|
Parameters
|
No. of Exceedance
|
No. of Exceedances due to
site activities of the Project
|
|
Action Level
|
Limit Level
|
Action Level
|
Limit Level
|
|
Water Quality
|
DO, mg/L
|
1
|
4
|
0
|
0
|
|
Turbidity, NTU
|
0
|
3
|
0
|
0
|
|
SS, mg/L
|
0
|
1
|
0
|
0
|
|
Air Quality
|
1-hour TSP, μg/m3
|
0
|
0
|
0
|
0
|
Water Quality Monitoring
5.
The WQ impact monitoring on the last week has been rescheduled from 27
& 29 April to 28 & 30 April. Another water quality monitoring was
conducted as scheduled in the reporting period. One (1) Action Level and eight
(8) Limit Level exceedances were recorded. All exceedances are considered as non-project related. Details are provided in Appendix
E.
Air Quality Monitoring
6.
The air quality monitoring was conducted as scheduled in the reporting period. No Action
Level and Limit Level exceedances were recorded.
Details are provided in Appendix G.
Key
Information in the
Reporting Period
7.
Complaints, notifications of
any summonses and prosecutions, as well as public engagement activities during
the reporting period, are summarised in Table III.
Table III Summary for Key Information in the
Reporting Period
|
Event
|
Details
|
Action Taken
|
Status
|
Remark
|
|
Number
|
Nature
|
|
Complaint
Received
|
0
|
-
|
N/A
|
N/A
|
-
|
|
Notifications
of any summons & prosecutions received
|
0
|
-
|
N/A
|
N/A
|
-
|
|
Public
Engagement Activities
|
0
|
-
|
N/A
|
N/A
|
-
|
Reporting Change
8.
There were no reporting changes during the reporting period.
Future Key Issue
9.
The key site activities will be anticipated in the coming
three months are shown in Table IV.
Table IV Tentative Site Activities in the Next
Three Months
|
Contract No.
|
Contract
Title
|
Site
Activities
|
|
DC/2024/11
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – Civil Works
|
l Temporary Drainage Construction
l Mobilisation work
l Erection of the site office
l Driven H-piling
l
Sheet
piling
|
|
DE/2024/09
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – E&M Works and
Biological Treatment Building
|
l
Erection of the site office
l
Ground investigation works at BTB for stage 2 of early access
|
10.
The future key environmental issues in the next
three months include:
l Water spraying for dust-generating
activities and on haul road;
l Accumulation of general refuse
and construction waste on-site;
l Accumulation of a stockpile of
soil & weeds from haul road cleaning activities or slope maintenance.
1.1
The Hung Shui Kiu Effluent
Polishing Plant (HSKEPP) (the Project), which is located in the north-western
side of the Hung Shui Kiu / Ha Tsuen New Development Area (HSK/HT NDA). It is
designed to provide reliable, adequate and quality sewage treatment and sewage
effluent disposal for the sewage collected from the new developments within the
HSK/HT NDA and other developments on the North West New Territories (NWNT).
1.2
An Environmental Impact
Assessment (EIA) study for the Project was conducted in accordance with EIA
Study Brief No. ESB- 312/2019. The EIA Report and Environmental Monitoring and
Audit (EM&A) Manual (Register No. AEIAR – 240/2022) were approved on 19 Oct
2022 under the Environmental Impact Assessment Ordinance (EIAO), with an
Environmental Permit (EP) granted on 19 Oct 2022 (EP-608/2022). Variation of
Environmental Permit (EP-608/2022A) was issued by
the Environmental Protection
Department (EPD) on 23 Apr 2025.
1.3
According to the approved
EM&A Manual of HSKEPP, the EM&A monitoring for the Project includes air
quality monitoring and water quality monitoring. Baseline dust and water
quality monitoring for HSKEPP was conducted between 24 Jun 2024 and 20
Jul 2024.
1.4
The Contract
No. HATS 07/2023 was superseded by Contract No. HATS 01/2025 from Feb 2026. EM&A Works for HSKEPP shall continue and be reported under the new Contract. Cinotech Consultants Limited (Cinotech) was commissioned by the
Drainage Services Department (DSD) as the Environmental Team
(ET) to undertake environmental monitoring and auditing services for the
Project to ensure that the environmental performance of the Works Contract
complies with the requirements specified in the EP, EM&A Proposal, Service
Specifications and Supporting Documents of the Project and other relevant
statutory requirements.
1.5
The commencement date of the
construction works of HSKEPP (EP-608/2022
& EP-608/2022/A) was on 6
Sep 2024. A total of
2 Environmental Team contracts for HSKEPP have been conducted to
undertake the EM&A works from the commencement of the Project. The
inter-relationship between various contracts of the HSKEPP project and submission of
previous EM&A reports is shown in Table
1.1
Table 1.1 Summary for the inter-relationship between
various contracts of the HSKEPP project and submission of previous EM&A
reports
|
Contract No. of the Environment Team for
HSKEPP
|
Environment Team
|
Submission of the previous monthly EM&A
report
|
|
HATS 07/2023
|
WSP (Asia) Limited (WSP)
|
Sep 2024 to Jan
2026
|
|
HATS
01/2025
|
Cinotech Consultants Ltd.
|
Feb 2026 to Mar 2026
|
1.6
The key elements of this Project are listed below:
l Demolition of existing structures and buildings within San Wai
Preliminary Treatment Works (SWPTW) for the construction of HSKEPP facilities;
l
Construction of a sewage treatment
plant with a maximum capacity of Average Dry Weather Flow (ADWF) up to 90,000 m3/day;
l
Construction of sludge
treatment facilities for treating sludge generated from Hung Shui Kiu (HSK)
Effluent Polishing Plant (EPP) and additional sludge generated from the San Wai
Sewage Treatment Works (STW) and other nearby STWs;
l
Construction of facilities for
receiving and co-digesting pre-treated food or organic wastes;
l
Construction of effluent
discharge pipe connecting to the existing discharge tunnel of San Wai STW; and
l
Associated ancillary works.
1.7
The layout plan of the
Project is shown in Figure 1.1.
1.8
This is the 20th Monthly EM&A Report
prepared by the Environmental Team, Cinotech Consultants Ltd., for Contract No.
HATS 01/2025 “Hung Shui Kiu Effluent Polishing Plant – Phase 1”, which
summarises the impact monitoring results and audit findings in accordance with
the requirement specified in the EM&A Manual (AEIAR-240/2022)
for HSKEPP approved on 19 October 2022 during the reporting period
from 1 April 2026
to 30 April 2026.
Summary of EM&A Requirements
1.9
The EM&A programme specified in the
EM&A Proposal requires water quality monitoring, air quality monitoring,
environmental site audit, etc. The EM&A requirements for each parameter are
described in the following sections, including:
l All monitoring parameters;
l Action and Limit levels for all
environmental parameters;
l Event and Action Plans;
l Environmental mitigation
measures, as recommended in the EIA Reports, Environmental Review Reports and
the EM&A Proposal.
1.10
The advice on the implementation status of
environmental protection and pollution control/mitigation measures is
summarised in Section 6 of this report.
1.11
This report presents the monitoring
results, observations, locations, equipment, period, methodology and QA/QC
procedures of the required water quality monitoring, air quality monitoring and
audit works for the Project in the reporting period.
1.12
Different Parties with
different levels of involvement in the project organisation include:
l Permit Holder – Drainage
Services Department (DSD)
l
Project Manager or Project
Manager’s Delegates – AECOM (Asia)
Consultants Limited (AECOM)
l
Environmental Team (ET) – Cinotech Consultants Limited (Cinotech)
l
Independent Environmental
Checker (IEC) – AtkinsRéalis Asia Limited (AtkinsRéalis)
l
Contractor (DC/2024/11)– China State - Best Build Joint Venture (CSBBJV)
l
Contractor (DE/2024/09) – REC Engineering - Chevalier (Envirotech) Limited Joint Venture (REC-CEL
JV)
1.13
The key contacts of the
Project are listed in Table 1.2.
Table 1.2 Key Project Contacts
|
Party
|
Role
|
Contact Person
|
Position
|
Phone No.
|
|
DSD
|
Project Proponent
|
Mr. Gabriel Lau
|
Engr/6 (Harbour Area Treatment Scheme)
|
3965 8629
|
|
AECOM
|
Project Manager or Project Manager’s
Delegates
|
Mr. Brian Wong
|
Associate
|
3856 5082
|
|
Cinotech
|
Environmental Team (ET)
|
Ms. Betty Choi
|
ET Leader
|
2151 2072
|
|
AtkinsRéalis
|
Independent Environmental Checker (IEC)
|
Mr. W. K. Chiu
|
Independent Environmental Checker
|
2972 1322
|
|
CSBBJV
|
Contractor (DC/2024/11)
|
Ms. Tiffany Tsang
|
Environmental Officer
|
5117 9020
|
|
REC-CEL JV
|
Contractor (DE/2024/09)
|
Mr. Stephen Tsang
|
Environmental Officer
|
9686 0787
|
1.14
The Organisational Structure
for Environmental Management is shown in Figure
1.2.
Construction Activities undertaken during the Reporting Period
1.15
The construction programme is presented in Appendix M.
1.16
The major site activities undertaken in the reporting period are shown in Table 1.3.
Table 1.3 Major Site Activities in the Reporting
Period
|
Contract No.
|
Contract Title
|
Major Site Activities
|
|
DC/2024/11
|
Hung Shui Kiu Effluent Polishing Plant
(HSKEPP) Phase 1 – Civil Works
|
l
Temporary
Drainage Construction
l
Erection
of the site office
l Driven H-piling
|
|
DE/2024/09
|
Hung Shui Kiu Effluent Polishing Plant
(HSKEPP) Phase 1 – E&M Works and Biological Treatment Building
|
l Erection of the site office
|
1.17
All relevant permits/licences obtained for this Project under
Contract DC/2024/11 and DE/2024/09 are summarised in Table 1.4 and Table 1.5, respectively.
Table 1.4 Summary of Environmental Licenses and
Permits under Contract DC/2024/11
|
Permit / License No.
|
Valid Period
|
Status
|
|
From
|
To
|
|
Environmental
Permit (EP)
|
|
EP-608/2022/A
|
23 Apr 2025
|
N/A
|
Valid
|
|
Notification
pursuant to Air Pollution Control (Construction Dust) Regulation
|
|
10018879
|
30 Jun 2025
|
End of Project
|
Valid
|
|
Billing
Account for Construction Waste Disposal
|
|
7055204
|
22 Jul 2025
|
N/A
|
Valid
|
|
Registration of
Chemical Waste Producer
|
|
WPN-5213-511-C5120-01
|
13 Oct 2025
|
N/A
|
Valid
|
|
Wastewater
Discharge License
|
|
WT000480221-2026
(Western Plant)
|
22 Jan 2026
|
31 Jan 2031
|
Valid
|
|
Construction
Noise Permit
|
|
PP-RN0003-26
(Percussive Piling)
|
4 Feb 2026
|
3 May 2026
|
Valid
|
|
GW- RN0121-26
|
2 Feb 2026
|
1 May 2026
|
Valid
|
Table 1.5 Summary of Environmental Licenses and
Permits under Contract DE/2024/09
|
Permit / License No.
|
Valid Period
|
Status
|
|
From
|
To
|
|
Environmental
Permit (EP)
|
|
EP-608/2022/A
|
23 Apr 2025
|
N/A
|
Valid
|
|
Notification
pursuant to Air Pollution Control (Construction Dust) Regulation
|
|
N/A
|
N/A
|
N/A
|
Apply when
necessary
|
|
Billing Account
for Construction Waste Disposal
|
|
7055160
|
14 Jul 2025
|
N/A
|
Valid
|
|
Registration
of Chemical Waste Producer
|
|
N/A
|
N/A
|
N/A
|
Apply when
necessary
|
|
Wastewater
Discharge License
|
|
N/A
|
N/A
|
N/A
|
Apply when
necessary
|
|
Construction Noise
Permit
|
|
N/A
|
N/A
|
N/A
|
Apply when
necessary
|
2
2.1
In accordance with the EM&A Manual,
impact water quality monitoring shall be carried out during the construction
phase. The impact of water quality monitoring should be taken at all designated
monitoring stations 3 days per week. The intervals between two sampling surveys
should not be less than 36 hours. Appendix A shows the established
Action/Limit Levels for the environmental monitoring works.
2.2
Duplicate in-situ measurements (Dissolved
Oxygen (DO) concentration, turbidity and pH) and water samples (Suspended
Solids (SS) at specific depth were monitored in accordance with the
requirements in the EM&A Proposal.
2.3
Other relevant data were also recorded,
such as monitoring location/position, time, sampling depth, weather conditions
and any special phenomena or work underway nearby.
2.4
According to the Contract Specification, water
quality monitoring is required to be conducted at two monitoring stations (one
upstream control station and one downstream impact station). The monitoring
stations are summarised in Table
2.1 and shown in Figure 2.1.
Table 2.1 Location of Water
Quality Monitoring
|
Stations
|
Locations
|
Coordinates (HK1980)
|
|
Easting
(m)
|
Northing
(m)
|
|
C1
|
Control Station at the upstream location
of the construction site
|
816278
|
834038
|
|
M1
|
Impact station at the downstream location
of the construction site
|
816571
|
833970
|
Monitoring Parameters and Frequency
2.5
Table 2.2
summarises the monitoring parameters
of the impact of water quality monitoring.
Table 2.2 Water Quality
Monitoring Parameters and
Frequency
|
Stations
|
Parameters
(unit)
|
Depth
|
Frequency
|
|
C1
M1
|
In-situ:
l Temperature(°C)
l pH (pH units)
l Turbidity (NTU)
l Water depth (cm)
l Salinity (ppt)
l Dissolved oxygen (DO) (mg/L and % of
saturation)
Laboratory
Testing:
l Suspended solids (SS) (mg/L)
|
Mid-depth at the River/Stream
|
3 days per week
|
2.6
Monitoring
location/position, time, water depth, sampling depth, weather conditions and
any special phenomena or work underway nearby were also recorded.
2.7
The equipment used in the
water quality monitoring programme is listed in Table
2.3. The copies of the
calibration certificates of the multi-parameter water quality system are shown
in Appendix B. The adopted equipment
fulfils the requirements specified in the EM&A Programme as detailed in the
following paragraphs.
Table 2.3 Water Quality
Monitoring Equipment
|
Equipment
|
Model
|
Serial No.
|
Qty.
|
|
Multi-parameter Water Quality System
|
YSI
EXO 1
|
16J100880 (for Sonde)
17A105025 (for DO Sensor)
17A105120(for Temperature Sensor)
16J101124 (for Turbidity Sensor)
17B100258(for pH Sensor)
|
1
|
Dissolved Oxygen (DO) and
Temperature
2.8
A portable and weatherproof instrument
for measuring dissolved oxygen and temperature with a cable, sensor, and DC
power source was adopted. The equipment is capable of measuring:
l DO level in the range of 0-20
mg/L and 0-200% saturation; and
l temperature in the range of 0-45
degrees Celsius.
Turbidity
2.9
A portable and weatherproof instrument with a DC power source was
adopted. Its photoelectric sensor is capable of measuring turbidity between 0
and 1000 NTU.
Water Sampler
2.10
A small sampler with an
extendable rod was used for water sampling due to the shallow water (water
depth < 50cm) during the dry season at the monitoring stations. In all
cases, the sampler had been submerged in the mid-water column before collecting
water samples.
Water Depth Detector
2.11
Due to the shallow water
(water depth < 50cm) at the monitoring stations, stainless steel rulers were
proposed to determine the water
depth.
Salinity
2.12
A portable salinometer capable of measuring salinity in
the range 0 – 40 parts per thousand (ppt) was adopted for measuring the
salinity of the water at each designated monitoring station.
pH
2.13
Instrument consists of a
potentiometer, a glass electrode, a reference electrode and a
temperature-compensating device. The instrument provides measurement precision
of 0.1 pH in a range of 0 to 14. Standard buffer solutions of at least pH 7 and
pH 10 were used for checking the instrument before and after use.
Sample Containers and Storage
2.14 Water samples for SS and
zinc were stored in high-density polythene bottles with no preservative added,
packed in ice or ice-cold insulator (cooled to 4°C without being frozen) and
delivered to the laboratory and analysed as soon as possible after collection.
Sufficient volume of samples was collected to achieve the detection limits
stated in Table
2.5.
2.15 Table
2.4 summarises the type of sampling
bottles and preservation method for laboratory testing.
All sampling bottles were labelled
(waterproof) with the sample lot number and sampling location reference number
to avoid mishandling.
Table 2.4 Types of Sampling
Bottles and Preservation Methods
|
Parameters to be Tested
|
Preservation
|
Type of Sample Container
|
|
Total Suspended Solids (SS)
|
Refrigerate
|
1-litre high-density polythene bottle
|
Calibration of In-situ
Instruments
2.16
All in-situ monitoring
instruments checked, calibrated and certified by a laboratory accredited under
HOKLAS or any other international accreditation scheme before use and
subsequently re-calibrated at 3-monthly intervals throughout all stages of the
water quality monitoring. Responses of
sensors and electrodes are checked with certified standard solutions before
each use. Wet bulb calibration for a DO
meter is carried out before measurement at each monitoring location. They were
certified by High Precision Chemical Testing Ltd. (HOKLAS Registration No.296).
2.17 Sufficient stocks of spare
parts, i.e., spare cables and sensors, have been maintained for replacements
when necessary. Backup monitoring equipment was also available so that
monitoring can proceed uninterrupted even when some equipment is under maintenance,
calibration, etc.
In-situ Measurement
2.18 A
multi-parameter meter (YSI EXO-01) was
used to measure Dissolved Oxygen (DO) concentration,
DO saturation (DO %), pH, temperature and turbidity
2.19
At each monitoring location,
two consecutive measurements were taken for water samples being collected on
site. The probes were retrieved from the water after the first measurement and
then redeployed for the second measurement. Where the difference in the value
between the first and second readings of each set was more than 25% of the
value of the first reading, the reading was discarded, and further readings
were taken.
2.20
For SS, water samples from the middle
layer were collected. Water samples of adequate volume specified by the
laboratory were collected and stored in high-density polythene bottles provided
by the laboratory. Water samples were packed in ice and cooled to 4°C (without
being frozen), delivered to a HOKLAS-accredited laboratory, High Precision
Chemical Testing Ltd. (HOKLAS Registration No.296), for laboratory analysis of
water samples as soon as possible after collection.
Laboratory Analytical
Methods
2.21
The testing of SS was conducted by High
Precision Chemical Testing Ltd. (HOKLAS Registration No.296), and comprehensive
quality assurance and control procedures were in place to ensure quality and
consistency in results. The SS determination work starts within 24 hours after
the collection of the water samples.
The testing method and limit of
reporting are provided in
Table 2.5.
Table 2.5 Methods for Laboratory Analysis for Water
Samples
|
Parameters
|
Proposed
Method
|
Detection Limit
|
|
Suspended Solids (SS)
|
APHA
2540D (1)
|
1.0 mg/L(2)
|
Note:
(1) APHA American Public Health Association Standard
Methods for the Examination of Water and Wastewater.
(2) If the lab result of SS concentration at
the control station was less than 1.0 mg/L, 1.0 mg/L would be assumed as the SS
concentration for calculating the action and limit levels based on the control
station as a conservative approach.
QA/QC Procedure
2.22
All QA/QC results, including
blank, spike recovery, number of duplicate samples per batch, etc., are
reported in accordance with the requirements of HOKLAS or an international
accredited scheme. detection limits and accuracy submitted to EPD for approval before
the commencement of the monitoring programme.
EPD may also request the laboratory to carry out analysis of known
standards provided by EPD for quality assurance.
2.23
Additional duplicate samples
may be required by EPD for inter-laboratory calibration. Remaining samples
after analysis are kept by the laboratory for 3 months in case repeat analysis
is required. If in-house or non-standard
methods are proposed, details of the method verification may also require
submission to EPD. In any circumstance,
the sample testing has comprehensive quality assurance and quality control
programmes. The laboratory prepares to demonstrate the programmes to EPD or its
representatives when requested.
Decontamination Procedures
2.24 Water sampling equipment
used during the course of the monitoring programme was decontaminated by manual
washing and rinsing with clean river water or bottled water after each sampling
event.
Sampling Management and
Supervision
2.25 Water samples were
dispatched to the testing laboratory for analysis as soon as possible after the
sampling. All samples were stored in a cool box and kept at less than 4ºC but
without frozen. All water samples were handled under chain of custody protocols
and relinquished to the laboratory representatives at locations specified by
the laboratory.
2.26 QA/QC reports by the
HOKLAS-accredited laboratory, High Precision Chemical Testing Ltd. (HOKLAS
Registration No.296), are attached with the laboratory testing report in Appendix F.
2.27 Calculated Action and Limit
Levels for water quality are presented in Table 2.6 below.
Table 2.6 Calculated Action
and Limit Levels of Water Quality Monitoring
|
Parameters
|
Unit
|
Action
Level
|
Limit
Level
|
|
DO (1)
|
mg/L
|
≤ 3.8 (3)(4)
|
≤ 3.7 (3)(4)
|
|
Turbidity (2)
|
NTU
|
≥ 17.2 (3)
or
120% of the upstream control station(s)
at the same tide of the same day, whichever is higher
|
≥ 17.7 (3)
or
130% of the upstream control station(s)
at the same tide of the same day, whichever is higher
|
|
SS (2)
|
mg/L
|
≥ 25.0 (3)
or
120% of the upstream control station(s)
at the same tide of the same day, whichever is higher
|
≥ 26.0 (3)
or
130% of the upstream control station(s)
at the same tide of the same day, whichever is higher
|
Note:
(1) For
DO, non-compliance with the water quality limits occurs when the monitoring
result is lower than the limits.
(2) For turbidity & SS, non-compliance with the
water quality limits occurs when the monitoring result is higher than the
limits.
(3) Average concentrations with duplicates
have been adopted in the calculation.
(4) The calculated action/limit levels of DO are the same after correcting
to the nearest 0.1mg/L.
2.29
The weather information for the reporting
period is summarised in Appendix D.
2.30 The in-situ monitoring
results and graphical presentation are shown in Appendix E. The laboratory testing reports of suspended solids are
also given in Appendix F.
2.31
One (1) Action Level and four (4) Limit
Level exceedances were recorded for Dissolved Oxygen (DO) of water quality
monitoring in the reporting period. All exceedances are considered as
non-project related.
2.32
No Action Level and three (3) Limit Level
exceedances were recorded for Turbidity (TUR) of water quality monitoring in
the reporting period. All exceedances are considered as non-project related.
2.33
No Action Level exceedances were recorded
for Suspended Solids (SS) of the water quality monitoring, while one (1) Limit
Level exceedance was identified in SS in the reporting period. All exceedances
are considered as non-project related.
2.34
Table 2.7
shows the number of exceedances
recorded in all
water quality monitoring
in the reporting period. The summary of the
exceedance records and the investigation report for the exceedances in the
reporting period
is shown in Appendix H.
Table 2.7 Number of
Exceedances in Water Quality Monitoring in Reporting Period
|
Parameters
|
No. of Exceedance
|
No. of Exceedances due to site activities of the Project
|
|
Action Level
|
Limit Level
|
Action Level
|
Limit Level
|
|
DO, mg/L
|
1
|
4
|
0
|
0
|
|
Turbidity, NTU
|
0
|
3
|
0
|
0
|
|
SS, mg/L
|
0
|
1
|
0
|
0
|
|
Total
|
1
|
8
|
0
|
0
|
2.35
Site audits were carried
out weekly to monitor and audit the timely implementation of water quality
within the site boundaries of the Project.
The summary of site audits is shown in Tables 6.1 and 6.2
of this report.
2.36
According to our field observations, the major influencing factors on the water quality monitoring results
are summarised in Table 2.8.
Table 2.8 Major Influencing Factors
on Water Quality Monitoring Results
|
Monitoring Stations
|
Influencing Factors on Water Quality Monitoring
|
|
C1 - Control
Station
|
l General refuse
accumulation surrounding the stream
l Suspected abnormal discharges surrounding the CEDD construction site
l Upstream
muddy water from the sub-channel due to
heavy rainfall weather
|
|
M1 - Impact
Station
|
3
3.1
According to the approved
EM&A Manual for HSKEPP
of the Project, 1-hour Total Suspended Particulates (TSP) monitoring was conducted
to monitor the air quality for this Project. The sampling frequency of
1-hour TSP monitoring, at least three times in every six days, shall
be undertaken when the highest dust impact occurs. Appendix A shows the established Action/Limit Levels for the
environmental monitoring works.
3.2
Three (3) designated monitoring
stations were selected for the air quality
monitoring programme. Table 3.1 describes the air quality
monitoring locations, which are also depicted in Figure 3.1.
Table 3.1 Locations for Air Quality Monitoring
|
Monitoring
Stations
|
Locations
|
Location of Measurement
|
|
AM1
|
Tseung Kong Wai
|
Ground Level
|
|
AM2
|
Farm House
|
Ground Level
|
|
AM3 (1)
|
Planned Port Back-up, Storage and
Workshop
|
N/A
|
Note:
(1) Air quality
impact monitoring station AM3 has been suspended since Nov 2024.
3.3
According to the previous ET’s monitoring
team, AM3 was blocked on 1 Nov 2024 for its construction works of the Port
Back-up, Storage and Workshop use. Based on the communications among ET, DSD,
IEC and EPD, all parties have no comment on the suspension of air quality
impact monitoring at AM3 until the construction works at AM3 are completed.
Details can be referred to Appendix L of the Monthly EM&A Report for Nov
2024.
3.4
Table
3.2 summarises the monitoring parameters,
monitoring period and frequencies of impact air quality monitoring. The
monitoring schedule is shown in Appendix
C.
Table 3.2 Impact Dust Monitoring Parameters,
Frequency and Duration
|
Monitoring Stations
|
Parameter
|
Period
|
Frequency
|
|
AM1,
AM2 & AM3(1)
|
1-hour TSP
|
0700 – 1900
|
Three times / six days
|
Note:
(1)
Air quality impact monitoring station AM3 has been suspended since Nov 2024.
3.5
The 1-hour sampling was determined by HVS to check the validity and
accuracy of the results measured by the direct reading method.
3.6
Table
3.3 summarises the equipment to be used for
air quality monitoring. Copies of
calibration certificates are attached in Appendix
B.
Table 3.3 Air Quality Monitoring Equipment
|
Equipment
|
Model and Make
|
Serial No.
|
Quantity
|
|
1-hour TSP Dust Meter
|
Sibata Model No.: LD-5R
|
4X7585
4X7586
|
2
|
|
HVS for Calibration/Maintenance
|
GMW GS2310
|
10379
|
1
|
|
Calibrator
|
TISCH Model:
TE-5025A
|
3864
|
1
|
1-hour TSP Monitoring
Measuring Procedures
3.7
The measuring procedures of the 1-hour dust meters were in accordance
with the Manufacturer’s Instruction Manual as follows: (Sibata Model No.: LD-5R)
l
The 1-hour dust meter is placed
at least 1.3 meters above ground.
l
Set POWER to “ON” and make sure
that the battery level is not flashing or at a low level.
l
Allow the instrument to stand
for about 3 minutes, and then the cap of the air sampling inlet has been
released.
l
Push the knob to the MEASURE
position.
l
Set time/mode setting to [BG]
by pushing the time setting switch. Then, start the background measurement by
pushing the start/stop switch once. It
will take 6 sec. to complete the background measurement.
l
Push the time setting switch to
change the time setting display to [MANUAL] at the bottom left of the liquid
crystal display.
l
Finally, push the start/stop
switch to stop the measuring after 1 hour of sampling.
l
Information such as sampling
date, time, count value and site condition was recorded during the monitoring
period.
Maintenance/Calibration
3.8
The following maintenance/calibration was required for the direct
dust meters:
l
Check and calibrate the meter
by HVS to check the validity and accuracy of the results measured by the direct
reading method at 2-month intervals throughout all stages of the air quality
monitoring.
3.9
Adoption of the wind data from the
existing automatic wind station, i.e. Lau Fau Shan, operated by Hong Kong Observatory
(HKO), rather than setting up wind data monitoring equipment, is based on the
following justifications:
l
The Lau Fau Shan
automatic wind station is located in the vicinity of the designated monitoring
locations. This Automatic wind station (22°28'08", 113°59'01") is
located at the north of the Project, and the anemometer is set up at 31m above
mean sea level. It is clear of obstructions or turbulence caused by the
buildings.
l
This automatic wind station was
considered as the closest wind station to the Project that could provide
representative wind data in the Hung Shui Kiu area; and
l Wind data collected by HKO was considered as a reliable data source
for the wind data; it is widely used in many EM&A Projects (e.g. Expansion
of Hong Kong International Airport into a Three-runway System, Siu Ho Wan
Station and Siu Ho Wan Depot Replanning Works – Advance Construction Works). The dataset is more accurate and
reliable, which can be downloaded periodically with a real-time data logger.
3.10
The data collected from Lau Fau Shan were
used to check the wind speed and wind direction. This weather information for
the reporting month is summarised in Appendix D.
3.11
All 1-hour TSP monitoring was conducted at the operating monitoring stations as scheduled in the reporting period. The
monitoring schedule is shown in Appendix
C
3.12
The weather information for the reporting period is summarised in Appendix D.
3.13
The monitoring data and graphical presentations of 1-hour TSP monitoring results are shown in Appendix G.
3.14
No Action
and Limit Level exceedance of the 1-hour
TSP monitoring was recorded
in the reporting period.
3.15
No exceedance was recorded for the air quality monitoring. The
summary of the exceedance record in the reporting period is shown in Appendix H.
3.17
According to our field observations, the major influencing factors on the air quality monitoring results are summarised in Table
3.4.
Table 3.4 Major Influencing Factors on Air Quality
Monitoring Results
|
Monitoring Stations
|
Influencing Factors on Air Quality Monitoring
|
|
AM1 - Tseung Kong Wai
|
l Road
Traffic at Ha Tsuen Road & the surrounding vintage road
l Non-project
related construction activities and storage of dusty material from the CEDD
project site managed by Gammon – Richwell
Engineering Joint Venture
|
|
AM2 - Farm House
|
l Road
Traffic at Ha Tsuen Road & the surrounding vintage road
l Non-project
related construction activities from the CEDD project site managed by Sang Hing – Kuly Joint
Venture
& Gammon – Richwell
Engineering Joint Venture
|
|
AM3 - Planned Port Back-up, Storage and
Workshop (1)
|
l N/A
|
Note:
(1) Air quality impact monitoring station AM3 has
been suspended since Nov 2024.
Comparison of EM&A Result with EIA Prediction
3.18
The air monitoring data were compared with
the predictions in the EIA Report (as approved in 2013), as summarised in Table
3.5.
Table 3.5 Comparison of 1-hr TSP Monitoring Data with
Predictions in EIA Report
|
Monitoring
Stations
|
ASR ID
|
Predicted Maximum 1-hr TSP Concentration
in EIA Report (AEIAR-240/2022), μg/m3
|
Reporting Month Result,
μg/m3
|
|
AM1
- Tseung Kong Wai
|
A601
|
154.0
|
23.4 – 97.2
|
|
AM2
- Farm House
|
A602
|
215.1
|
8.0 – 88.0
|
|
AM3
- Planned Port Back-up, Storage and Workshop (1)
|
P1501
|
234.6
|
N/A
|
Note:
(1)
Air quality impact monitoring station AM3 has been suspended since Nov 2024.
3.19
The maximum 1-hour TSP concentration at
AM1 & AM2 in the reporting month was lower than the prediction in the EIA
Report (AEIAR-240/2022).
4
4.2
The quantities of different types of waste generated
by Contract DC/2024/11 and Contract DE/2024/09 in the reporting period are summarised in Tables
4.1 and
4.2, respectively. Details of the amount of
waste generated by the major site activities of the Project during the
reporting period are shown in Appendix L.
Table 4.1 Quantities of
Waste Generated from Contract DC/2024/11
|
Contract DC/2024/11
|
Quantity
|
|
Inert C&D Materials
|
Non-inert C&D Materials
|
|
Reporting
Period
|
Total
Quantity
Generated
(in
'000kg)
|
Disposed
as
Public
Fill (in '000kg)
|
Others,
e.g.
general
refuse (in '000kg)
|
Metals
(in
'000kg)
|
Paper/cardboard
Packaging
(in
'000kg)
|
Plastics
(in
'000kg)
|
Chemical
waste (in '000kg)
|
|
Apr 2026
|
14.39
|
14.39
|
13.78
|
0
|
0
|
0
|
0
|
Table 4.2 Quantities of
Waste Generated from Contract DE/2024/09
|
Contract DE/2024/09
|
Quantity
|
|
Inert C&D Materials
|
Non-inert C&D Materials
|
|
Reporting
Period
|
Total
Quantity
Generated
(in
'000kg)
|
Disposed
as
Public
Fill (in '000kg)
|
Others,
e.g.
general
refuse (in '000kg)
|
Metals
(in
'000kg)
|
Paper/cardboard
Packaging
(in
'000kg)
|
Plastics
(in
'000kg)
|
Chemical
waste (in '000kg)
|
|
Apr 2026
|
0
|
0
|
3.190
|
0
|
0
|
0
|
0
|
4.3
Site audits were carried out weekly to monitor and audit to ensure
that proper storage, transportation, and disposal practices of waste materials
generated during construction activities, such as construction and demolition
(C&D) materials and general refuse, are being implemented. The
summary of site audits is shown in Tables 6.1 and 6.2 of this report. The implementation status of the
waste/chemical management measures in the reporting period is summarised in Appendix I.
4
landscape
and visual
5
5.1
According to the EM&A
Manual, site audits would be undertaken during the construction phase of
the Project to check that the proposed landscape and visual mitigation measures
are properly implemented and maintained as per their intended objectives. Site
inspections of the implementation of landscape and visual mitigation measures would
be undertaken regularly during the construction period.
5.2
Site inspection of the implementation of
landscape and visual mitigation measures was undertaken by
the ET at least once every month
during the construction period.
5.3
Site inspection of the
implementation of landscape and visual mitigation measures within the site
boundaries of this Project was conducted on
10 April 2026. The implementation status
of the landscape and visual mitigation measures in the reporting period is
summarised in Appendix I. The
summary of observations and recommendations made for landscape and visual
mitigation measures during site audits is shown in Tables 6.1 and 6.2 of this report.
5.4
No non-compliance with the landscape and visual impact was recorded
in the reporting period.
6
6.1
Site audits were carried out on a weekly basis to monitor the timely
implementation of proper environmental management practices and mitigation
measures on the Project site.
6.2
Site audits for the Project were conducted on 2, 10,
17, 24 & 30 April 2026 in the reporting period. Joint site inspection with the representative of IEC was conducted on 10 April 2026. No non-compliance was observed during the site audit.
6.3
The monitoring work conducted by the monitoring team was inspected
regularly. The following procedures have been recorded for the monitoring
works:
Water Quality Monitoring
l
The Water Quality Monitoring was conducted as scheduled in the reporting
month.
l
The monitoring team recorded all observations surrounding the monitoring
stations C1 & M1, which might affect the monitoring result.
l
The monitoring team confirmed the pH meter, DO meter and turbidimeter
were checked and calibrated.
l
The monitoring team recorded the temperature, time, water depth and
weather conditions during the sampling processes.
l
The Environmental Team followed the Event and Action Plan after the exceedance was recorded.
Air Quality Monitoring
l
The Air Quality Monitoring was conducted as scheduled in the reporting
month
l
The monitoring team recorded all observations around the monitoring
stations within and outside the construction site.
l
The monitoring team recorded the temperature, time and weather
conditions on the monitoring days.
6.4
According to the Environmental Permit, the approved EIA Report (Register No.: AEIAR-240/2022), and the EM&A Manual of the Project, the mitigation measures detailed
in the documents are recommended to be implemented during the construction
phase. An Environmental Mitigation
Implementation Schedule (EMIS) is provided in Appendix I.
6.5
The ET weekly site inspections were carried out during the reporting period, and the observations, reminders, and follow-up actions for Contract DC/2024/11 and Contract
DE/2024/09 are summarised in Table 6.1 and Table 6.2, respectively.
Table 6.1 Observations and Recommendations of
Site Audit under Contract DC/2024/11
|
Parameters
|
Date
|
Observations
|
Follow-up
Actions
|
|
Water Quality
|
24 Apr 2026
|
Vehicle
wheel washing should be provided to prevent mud from flowing out of
the
site at the Eastern site.
|
A
dedicated vehicle wheel washing station has been installed at the site exit.
The facility includes water spray nozzles, drainage channels, and bunding to
contain and manage runoff water effectively. Temporary bunds have been
constructed around the washing area to prevent contaminated water from
flowing off-f-site.
|
|
Air Quality
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Noise
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Waste / Chemical
Management
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Land
Contamination
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Landscape and Visual
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Permits /Licences
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
Table 6.2 Observations and Recommendations of
Site Audit under Contract DE/2024/09
|
Parameters
|
Date
|
Observations
|
Follow-up
Actions
|
|
Water Quality
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Air Quality
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Noise
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Waste / Chemical
Management
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Land
Contamination
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Landscape and Visual
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
|
Permits /Licences
|
N/A
|
No environmental
deficiency was identified in the reporting period.
|
N/A
|
6.6
The Event Action Plans for water quality and air quality are presented in Appendix J.
Water Quality Monitoring
6.7
One (1) Action Level and eight (8) Limit Level exceedances for water quality monitoring were recorded in
the reporting period.
All exceedances are considered as non-project related.
Air Quality Monitoring
6.8
No Action Level and Limit Level exceedances for air quality
monitoring were recorded in the reporting period.
6.9
No environmental complaints and environmental warnings, notifications of summons and successful
prosecutions were received in the reporting period.
6.10
The summary of environmental complaint, warning, summons and
notification of successful prosecution for the Project is presented in Appendix
K.
6
future Key issues
7
7.1
Tentative construction programmes for the next three months are
provided in Appendix O. The key site activities
will be anticipated
in the coming three months are shown in Table 7.1.
Table 7.1 Tentative Site Activities in the Next
Three Months
|
Contract No.
|
Contract
Title
|
Site
Activities
|
|
DC/2024/11
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – Civil Works
|
l Temporary Drainage Construction
l
Mobilisation
work
l
Erection
of the site office
l
Driven H-piling
l Sheet piling
|
|
DE/2024/09
|
Hung
Shui Kiu Effluent Polishing Plant (HSKEPP) Phase 1 – E&M Works and
Biological Treatment Building
|
l Erection
of the site office
l Ground investigation works at
BTB for stage 2 of early access
|
7.2
Key environmental issues in the coming three months include:
l
Wastewater and run-off generation on-site;
l
Water spraying for dust-generating activities and on haul road;
l
Accumulation of general refuse and construction waste on-site;
l
Accumulation of a stockpile of soil & weeds from haul road cleaning
activities or slope maintenance.
7.3
According to the environmental audit in
the reporting month (April 2026) as well as the previous months, the following
recommendations were made which shall be implemented in the next reporting
month (May 2026).
Water Quality
l The site practices outlined in ProPECC PN
2/24 “Construction Site Drainage” should be followed as far as practicable to
minimise surface run-off and the chance of erosion.
l All vehicles and plants should be cleaned before they leave a
construction site to minimise the deposition of earth, mud and debris on roads.
Air Quality
l Establishment and use of vehicle wheel and body washing facilities
at the exit points of the site.
l Open stockpiles shall be avoided or covered. Where possible, prevent
placing dusty material storage piles near ASRs.
7.4
The tentative environmental monitoring
schedules for next month are shown in Appendix C.
8
8.1
This is the 20th Monthly
EM&A
Report, which presents the EM&A
works undertaken during the reporting month from 1 April
2026 to 30 April 2026 in accordance with the EM&A Manual and the requirements under the EP-606.2022/A.
Water Quality Monitoring
8.2
The WQ impact monitoring for the last week has been rescheduled from 27 & 29 April to 28 & 30 April.
Another water quality monitoring was conducted as scheduled in the reporting
period.
8.3
One (1) Action Level and four (4) Limit Level exceedances for Dissolved Oxygen (DO) were recorded. All exceedances are considered as non-project
related.
8.4
No Action Level and three (3) Limit Level exceedances for Turbidity (TUR) were recorded. All exceedances are considered as non-project
related.
8.5
No Action Level exceedances were recorded
for Suspended Solids (SS) of the water quality monitoring, while one (1) Limit
Level exceedance was identified in SS in the reporting period. All exceedances
are considered as non-project related.
Air Quality Monitoring
8.6
All air quality monitoring was conducted as scheduled in the
reporting period.
8.7
No Action/Limit Level exceedance for
1-hour TSP monitoring was recorded.
Site Audit
8.8
5
ET joint weekly environmental site inspections were conducted in the reporting period.
Joint weekly site inspections with the representative of ET, the
Engineer Representative and the Contractor for Contract No. DC/2024/11
and Contract No. DE/2024/09
were conducted on 2,
10, 17, 24 & 30 April 2026, whereas a monthly
joint site inspection with the representative of IEC was conducted on
10 April
2026. All environmental
deficiencies observed during site inspections were rectified by the Contractor.
Complaint, Notification of Summons and Successful Prosecution
8.9
No environmental complaints
and notifications
of summons and successful prosecutions were received in the reporting period.
