1
Introduction
1.1
Background
The SENT Landfill Extension (SENTX) forms an integral part in the
Strategic Plan in maintaining the continuity of landfill capacity in the Hong
Kong for the cost-effective and environmentally satisfactory disposal of waste.
The Environmental Impact Assessment (EIA) Report and the
associated Environmental Monitoring and Audit (EM&A) Manual for the
construction, operation, restoration and aftercare of the SENTX (hereafter
referred to as “the Project”) have been approved under the Environmental
Impact Assessment Ordinance (EIAO) in May 2008 (Register No.:
AEIAR-117/2008) (hereafter referred to as the approved EIA Report) and an
Environmental Permit (EP-308/2008) (EP) was granted by the Director of
Environmental Protection (DEP) on 5 August 2008.
Since then, applications for
Variation of an Environmental Permit (No. VEP-531/2017) were submitted to EPD
and the Variation of Environmental Permits (EP-308/2008/A and EP-308/2008/B)
were granted on 6 January 2012 and 20 January 2017, respectively, as the Hong
Kong SAR Government has decided to reduce the scale of the design scheme of
SENTX assessed in the approved EIA Report and SENTX will only receive
construction waste. In May 2018, a Further Environmental Permit (FEP)
(FEP-01/308/2008/B) was granted to the SENTX’s contractor, Green Valley
Landfill, Limited (GVL).
ERM-Hong Kong, Limited (ERM) and Meinhardt Infrastructure and
Environment Limited (Meinhardt) are commissioned to undertake the roles of
Environmental Team (ET) and the Independent Environmental Checker (IEC),
respectively, to undertake the EM&A activities for the Project in
accordance with the requirements specified in the EP, updated EM&A Manual (),
approved EIA Report () taking
account of the latest design and other relevant statutory requirements.
1.2
Project
Description
The SENTX is a piggyback landfill, occupying the southern part of the
existing SENT Landfill (including its infrastructure area) and 13 ha of Tseung
Kwan O (TKO) Area 137. A layout plan of the SENTX is shown in Figure 1.1. Under the latest
design, the SENTX has a net void capacity of about 6.5 Mm3 and
provides an additional lifespan of about 6 years, commencing operation upon
exhaustion of the SENT Landfill. The SENTX will receive construction waste
only.
The key implementation milestones of the Project are indicatively
summarised in Table 1.1. The construction works and operation of the Project
commenced on 2 January 2019 and 21 November 2021, respectively.
Table
1.1 Estimated Key Dates of Implementation Programme
|
Key Stage of the Project
|
Indicative Date
|
|
Start construction
|
2 January 2019
|
|
Commissioning of new infrastructure facilities
|
2020
|
|
Demolition of existing infrastructure facilities
|
2021
|
|
Start waste intake at SENTX
|
21 November 2021
|
|
Estimated exhaustion date of. SENTX
|
2027
|
|
End of aftercare for SENTX
|
2057
|
The major construction works of the SENTX
includes:
· Site formation at the TKO Area 137
and the existing infrastructure area at SENT Landfill;
· Construction of surface and
groundwater drainage systems;
· Construction of the leachate
containment and collection systems;
· Construction of new leachate and
landfill gas treatment facilities, site offices, maintenance yards at the new
infrastructure area;
· Construction of new pipelines to
transfer the leachate and landfill gas collected from the existing SENT
Landfill to the treatment facilities at the new infrastructure area;
· Construction of the site access and
new waste reception facilities; and
· Demolition of the facilities at the
existing SENT Landfill infrastructure area.
1.3
Scope of the EM&A Report
This is the Monthly EM&A Report
for the Project which summarises the key findings of
the EM&A programme during the reporting period
from 1 to 31 October 2023 for the construction and operation works.
1.4
Project Organisation
The organisation structure of the Project is presented in Figure
1.2.
Figure 1.2
Organisation Chart
Contact details of the key
personnel are summarised in Table 1.2 below.
Table 1.2 Contact
Information of Key Personnel
|
Party
|
Position
|
Name
|
Telephone
|
|
Contractor
(Green Valley
Landfill Limited)
|
Project Manager
|
Carl Lai
|
2706 8829
|
|
Environmental Team
(ET) (ERM-Hong Kong, Limited)
|
ET Leader
|
Terence Fong
|
2271 3156
|
|
Independent Environmental Checker (IEC)
(Meinhardt Infrastructure and Environment
Limited)
|
IEC
|
Claudine Lee
|
2859 5409
|
1.5
Summary of Construction Works
The programme of the construction is shown in Annex A. As informed by the Contractor,
the major works carried out in this reporting period include:
·
Testing and commissioning of CCTV system at infrastructure area;
·
Maintenance and improvement of temporary surface water drainage;
·
Weighbridge enhancement
with C-easy; and
·
Restoration of Phase 1 Cell 1X.
The
implementation schedule of the mitigation measured recommended in the Updated
EM&A Manual is presented in Annex
B.
1.6
Summary of EM&A Programme Requirements
The status for
all environmental aspects are presented in Table
1.3. The EM&A requirements remained unchanged during the
reporting period.
Table 1.3 Summary of Status
for the Environmental Aspects under the Updated EM&A Manual
|
Parameters
|
Status
|
|
Air Quality
|
|
Baseline
Monitoring
|
The results of
baseline air quality monitoring were reported in Baseline Monitoring Report
and Pre-operation Baseline Monitoring Report and submitted to EPD under EP
Condition 3.3
|
|
Impact
Monitoring
|
On-going
|
|
Noise
|
|
Baseline
Monitoring
|
The results of baseline
noise monitoring were reported in Baseline Monitoring Report and submitted to
EPD under EP Condition 3.3
|
|
Impact
Monitoring
|
On-going
|
|
Water
Quality
|
|
Baseline
Monitoring
|
The results of
baseline surface water quality monitoring were reported in Baseline
Monitoring Report and Pre-operation Baseline Monitoring Report and submitted
to EPD under EP Condition 3.3
|
|
Impact
Monitoring
|
On-going
|
|
Landfill Gas
|
|
Impact
Monitoring
|
On-going
|
|
Waste
Management
|
|
Waste
Monitoring
|
On-going
|
|
Landscape and
Visual
|
|
Baseline
Monitoring
|
The results of
baseline landscape and visual monitoring were reported in Baseline Monitoring
Report and submitted to EPD under EP Condition 3.3
|
|
Operation Phase
Audit
|
On-going
|
|
Site
Environmental Audit
|
|
Regular Site
Inspection
|
On-going
|
|
Complaint
Hotline and Email Channel
|
On-going
|
|
Environmental Log Book
|
On-going
|
Taking into account
the operation works, impact monitoring of air quality, noise, water quality,
landfill gas and waste management were carried out in the reporting period. The
impact monitoring schedule of air quality, noise, water quality and landfill
gas monitoring are provided in Annex
C.
The EM&A programme also involved environmental site inspections and
related auditing conducted by the ET for checking the implementation of the
required environmental mitigation measures recommended in the approved EIA
Report and relevant EP submissions. To promote the environmental awareness and
enhance the environmental performance of the contractors, environmental
trainings and regular environmental management meetings were conducted during
the reporting period, which are summarized as below:
Ÿ
One environmental management meeting was held with the Contractor, ER,
ET, IEC and EPD on 19 October 2023; and
Ÿ
Environmental toolbox trainings on Wastewater Management in Construction Site and Volatile Organic Compounds (VOC) and Smog on 20 October
2023 and 25 October 2023, respectively by the Contractor to the workers.
1.7
Status of Statutory
Environmental Compliance with the Environmental Permit
The status of statutory environmental
compliance with the EP conditions under the EIAO, submission status under the
EP and implementation status of mitigation measures are presented in Table
1.4.
Table 1.4 Status of
Submissions required under the EP and Implementation Status of Mitigation
Measures
|
EP
Condition
|
Submission
/ Implementation Status
|
Status
|
|
2.3
|
Management Organisation of Main Construction Companies
|
Submitted and
accepted by EPD.
|
|
2.4
|
Setting up of Community
Liaison Group
|
Community
Liaison Group was set up.
|
|
2.5
|
Submission of
Detailed Landfill Gas Hazard Assessment Report
|
Submitted and
accepted by EPD on 10 January 2019.
|
|
2.6
|
Submission of
Restoration and Ecological Enhancement Plan
|
Submitted to
EPD on 28 June 2019.
|
|
2.7
|
Setting up of
Trial Nursery
|
Trial Nursery
works was commenced on 28 August 2019.
|
|
2.8
|
Advance Screen
Planting
|
Advance Screen
Planting works were completed on 28 June 2019.
|
|
2.9
|
Provision of Multi-layer
Composite Liner System
|
Under
implementation.
|
1.8
Status of Other Statutory
Environmental Requirements
The environmental licenses and
permits (including EP, Water Pollution Control Ordinance (WPCO) discharge
license, registration as a chemical waste producer, and construction noise
permit) that are valid in the reporting period are presented in Table 1.5.
No non-compliance with environmental statutory requirements was identified.
Table 1.5 Status of
Statutory Environmental Requirements
|
Description
|
Ref No.
|
Status
|
|
Environmental Permit
|
EP-308/2008
|
Granted on 5 August 2008
|
|
Variation of Environmental Permit
|
EP-308/2008/A
|
Granted on 6 January 2012
|
|
EP-308/2008/B
|
Granted on 20 January 2017
|
|
Further Environmental Permit
|
FEP-01/308/2008/B
|
Granted on 16 May 2018
|
|
Water Discharge License under WPCO
(Permit Holder: GVL)
|
Licence No.: WT00041447-2022
|
Validity from 17 June 2022 to 30
June 2024
|
|
Billing Account for Disposal of
Construction Waste
|
Chit Account Number: 5001692
|
Approved on 28 December 2005
|
|
Registration as a Chemical Waste
Producer (Permit Holder: GVL)
|
5296-839-G2228-01
|
Issued on 31 December 2015
|
|
Construction Noise Permit (Permit
Holder: GVL)
|
GW-RE1146-23
|
Validity from 15 September 2023 to
14 March 2024
|
2
EM&A Results
The EM&A programme for the Project required environmental monitoring
for air quality, noise, water quality and landfill gas as well as environmental
site inspections for air quality, noise, water quality, landfill gas, waste
management, and landscape and visual impacts. The EM&A requirements and
related findings for each component are summarised in
the following sections.
2.1
Air Quality Monitoring
2.1.1
Dust
Monitoring
Monitoring Requirements and Equipment
According to the
updated EM&A Manual of the Project, impact dust monitoring (in term of
Total Suspended Particulates (TSP)) was carried out at the four designated locations along the site boundary
(i.e. AM1, AM2, AM3 and AM4) during the operation/restoration phase, at a 6-day
interval.
The Action and
Limit Levels of the dust monitoring is provided in Table 2.1 below.
Table 2.1 Action and
Limit Levels for 24-hour TSP
|
Monitoring
Station
|
Action
Level
|
Limit Level
|
|
AM1 - SENTX
Site Boundary (North)
|
260 µg m-³
|
260 µg m-³
|
|
AM2 - SENTX
Site Boundary (West, near DP3)
|
|
AM3 - SENTX Site
Boundary (West, near RC15)
|
|
AM4 - SENTX
Site Boundary (West, near EPD building)
|
High volume air samplers (HVSs) in compliance
with the specifications listed under Section 3.2.2 of the updated EM&A
Manual were used to measure 24-hour TSP levels at the dust monitoring stations.
The HVSs were calibrated upon installation and thereafter at bi-monthly
intervals to check the validity and accuracy of the results.
The equipment
used in the impact dust monitoring programme and monitoring
locations are summarised in Table 2.2 and
illustrated in Figure 2.1, respectively.
Copies of the calibration certificates for the equipment are presented in Annex D1.
Table 2.2 Dust Monitoring Details
|
Monitoring Station
|
Location
|
Parameter
|
Frequency and
Duration
|
Monitoring Dates
|
Equipment
|
|
AM1
|
SENTX Site Boundary (North)
|
24-hour TSP
|
Once every 6 days
|
4, 10, 16, 22,
28 Oct 2023
|
Tisch TE-5170 (S/N:
3976)
|
|
AM2
|
SENTX Site Boundary (West, near DP3)
|
Tisch TE-5170 (S/N:
3573)
|
|
AM3
|
SENTX Site
Boundary (West, near RC15)
|
Tisch TE-5170 (S/N:
3572)
|
|
AM4
|
SENTX Site
Boundary (West, near EPD building)
|
Tisch TE-5170 (S/N:
3957)
|
Monitoring Schedule for the Reporting Month
The schedule for dust
monitoring during the reporting period is provided in Annex C.
Results and Observations
The monitoring
results for 24-hour TSP are summarised in Table
2.3. The detailed monitoring results and the graphical presentation of the
24-hour TSP results at each monitoring location are provided in Annex D2.
Table 2.3 Summary of
24-hour TSP Monitoring Results in the Reporting Period
|
Monitoring Station
|
Average 24-hr TSP Concentration (µg m-3)
(Range in bracket)
|
Action Level (µg/m3)
|
Limit Level (µg/m3)
|
|
AM1 - SENTX Site Boundary (North)
|
97 (54 – 177)
|
260
|
260
|
|
AM2 - SENTX Site Boundary (West, near DP3)
|
100 (45 – 163)
|
260
|
260
|
|
AM3 - SENTX Site Boundary (West, near RC15)
|
151 (80 – 233)
|
260
|
260
|
|
AM4 - SENTX Site Boundary (West, near EPD
building)
|
106 (72 – 158)
|
260
|
260
|
The major dust sources in the
reporting period included fugitive dust emission from exposed area in SENTX as
well as nearby operations of the TKO Area 137 Fill Bank.
No Action and Limit Levels
exceedance was recorded for TSP monitoring in the reporting period. No
action is thus required to be undertaken in accordance with the Event and
Action Plan presented in Annex D3.
Meteorological
Data
Meteorological data obtained from
the SENTX on-site meteorological monitoring station was used for the dust
monitoring and is shown in Annex
D4. It is considered that meteorological data obtained at the on-site
meteorological monitoring station is representative of the Project area and
could be used for the operation/restoration phase dust monitoring programme for the Project.
2.1.2
Odour Monitoring
Monitoring Requirements
According to the
updated EM&A Manual of the Project, odour patrol was carried out along the site
boundary during the operation/ restoration phase.
During the first
month of operation, daily odour patrol (3 times per day)
was conducted jointly by the ET and the IEC. The odour
intensity detected was based on that determined by the IEC. In addition, an
independent party (ALS Technichem (HK) Pty Ltd.) was
appointed to undertake odour patrol together with the
ET and IEC three times per week. During these patrols, the odour
intensity detected was based on that determined by the independent third party.
Reduction of odour monitoring frequency from
Period 1 (daily, three times per day) to Period 2 (weekly) was approved by EPD
on 4 February 2022. Weekly odour patrol
was conducted jointly by the ET and the IEC from 10 February 2022. In
addition, an independent party (ALS Technichem (HK)
Pty Ltd.) was appointed to undertake odour patrol
together with the ET and IEC once every two weeks.
Reduction of odour monitoring frequency from
Period 2 (weekly) to Period 3 (monthly) was approved by EPD on 2 June
2022. Monthly odour patrol was conducted
jointly by the ET and the IEC from 28 June 2022. In addition, an
independent party (ALS Technichem (HK) Pty Ltd.) was
appointed to undertake odour patrol together with the
ET and IEC quarterly.
The Action and
Limit Levels for odour patrol is provided in Table
2.4 below.
Table 2.4 Action and
Limit Levels for Odour Patrol
|
Parameter
|
Action Level
|
Limit Level
|
|
Perceived
odour intensity and odour complaints
|
· Odour intensity ≥ Class 2
recorded; or
· One documented complaint received
|
· Odour intensity ≥ Class 3
recorded on 2 consecutive patrol (a) (b)
|
|
Notes:
(a)
i.e. either Class
3-strong or Class 4-extreme odour intensity.
(b)
The exceedances of
the odour intensity do not need to be recorded at the same location.
|
Odour patrol was conducted by trained personnel/competent
persons with a specific sensitivity to a reference odour
(i.e. on reference materials n-butanol with the concentration of 50ppm in
nitrogen (v/v)) in compliance
with Section 3.7.2 of the updated EM&A Manual patrolling and
sniffing along the SENTX Site boundary to detect any odour.
The odour monitoring programme and
patrol route are summarised in Table 2.5 and
illustrated in Figure 2.2 respectively.
Copies of the certificates of the qualified odour
panelist are presented in Annex
D5.
Table 2.5 Odour
Monitoring Details
|
Patrol Locations
|
Parameters
|
Patrol Frequency (a)
|
Monitoring Dates
|
|
Patrol along the
SENTX Site Boundary (Checkpoints OP1 – OP17)
|
Odour Intensity (see Table
2.6)
|
Period 1 - First month of operation
Daily, three times a
day in the morning, afternoon and evening/night (between 18:00 and 22:00 hrs)
conducted by the ET and the IEC
Three times per week
on different days conducted by an independent third party together with the
ET and IEC (b)
Period 2 - Three months following period 1 (c)
Weekly conducted by
the ET and the IEC
Once every two weeks conducted
by an independent third party together with the ET and IEC (b)
Period 3 - Throughout operation following period 2 (c)
Monthly conducted by
the ET and the IEC
Quarterly conducted
by an independent third party together with the ET and IEC (b)
|
Conducted by ET
& IEC:
19 Oct 2023
Conducted by an
independent third party, ET & IEC:
-
|
|
Notes:
(a)
Reduction of
monitoring frequency will be subject to the monitoring results to demonstrate
environmentally acceptable performance.
(b)
Patrol shall be
scheduled so that they are carried out together with the patrols to be
carried out jointly by the ET and the IEC.
(c)
Commencement of each
period will be justified by the ET Leader and verified by the IEC and
will be subject to agreement with the EPD (EIAO Authority) and Project
Proponent.
|
Table 2.6 Odour
Intensity Level
|
Class
|
Odour Intensity
|
Description
|
|
0
|
Not Detected
|
No odour perceived or an
odour so weak that it cannot be easily characterised or
described.
|
|
1
|
Slight
|
Identified odour,
slight
|
|
2
|
Moderate
|
Identified odour,
moderate
|
|
3
|
Strong
|
Identified odour,
strong
|
|
4
|
Extreme
|
Severe odour
|
Monitoring Schedule for the Reporting Month
The schedule for odour patrol during the reporting period is provided in Annex C.
Results and Observations
The odour monitoring results are summarised
and provided in Table 2.7 and Annex D6, respectively.
Table 2.7 Summary of
Odour Monitoring Results in the Reporting Period
|
Odour
Checkpoints
|
Odour
Intensity Class
|
Action Level
|
Limit Level
|
|
OP1
|
0
|
Odour
intensity ≥ Class 2 recorded
|
Odour intensity ≥
Class 3 recorded on 2 consecutive patrol
|
|
OP2
|
0
|
|
OP3
|
1
|
|
OP4
|
0
|
|
OP5
|
0
|
|
OP6
|
0
|
|
OP7
|
0
|
|
OP8
|
0
|
|
OP9
|
1
|
|
OP10
|
1
|
|
OP11
|
0
|
|
|
|
OP12
|
0
|
|
|
|
OP13
|
0
|
|
|
|
OP14
|
0
|
|
|
|
OP15
|
0
|
|
|
|
OP16
|
0
|
|
|
|
OP17
|
0
|
|
|
The potential odour source in the reporting period included Leachate
Treatment Plant at SENTX and
the nearby Towngas plant. All the odour monitoring results were below the Action and Limit
Levels in the reporting period. No action is thus required to be undertaken in
accordance with the Event and Action Plan presented in Annex D3.
2.1.3
Thermal Oxidiser, Landfill Gas Flare and Landfill Gas Generator
Stack Emission Monitoring
Monitoring Requirements and Equipment
According to the updated
EM&A
Manual of the Project, the performance of the thermal oxidiser,
landfill gas flare and landfill gas generator was monitored when they are in
operation. Gas samples
were collected from the stack of the thermal oxidizer, landfill
gas flare and landfill gas generator for laboratory analysis for NO2, CO, SO2,
Benzene and Vinyl chloride and in-situ analysis for exhaust gas velocity at
monthly interval and for laboratory analysis for non-methane organic compounds
and ammonia (for thermal oxidizer only) at quarterly interval. The operating conditions of the thermal oxidiser, landfill
gas flare and landfill gas generator were also monitored continuously.
The Limit Levels for stack emission of
the thermal oxidiser, landfill gas flare and landfill gas generator are provided in Tables 2.8 –
2.10 below.
Table 2.8 Limit Levels
for Stack Emission of the Thermal Oxidiser
|
Parameters
|
Limit Level
|
|
NO2
|
1.58 gs-1
|
|
CO
|
0.53 gs-1
|
|
SO2
|
0.07 gs-1
|
|
Benzene
|
3.01 x 10-2 gs-1
|
|
Vinyl chloride
|
2.23 x 10-3 gs-1
|
|
Gas combustion
temperature
|
850oC
(minimum)
|
|
Exhaust gas exit
temperature
|
443K (minimum) (a)
|
|
Exhaust gas velocity
|
7.5 ms-1 (minimum) (a)
|
|
Note:
(a) Level
under full load condition.
|
|
Table 2.9 Limit Levels
for Stack Emission of the Landfill Gas Flare
|
Parameters
|
Limit Level
|
|
NO2
|
0.97 gs-1
|
|
CO
|
2.43 gs-1
|
|
SO2
|
0.22 gs-1
|
|
Benzene
|
4.14 x 10-4 gs-1
|
|
Vinyl Chloride
|
2.60 x 10-4 gs-1
|
|
Gas combustion
temperature
|
815oC
(minimum)
|
|
Exhaust gas exit
temperature
|
923 K (minimum) (a)
|
|
Exhaust gas velocity
|
9.0 m s-1 (minimum) (a)
|
|
Note:
(a) Level
under full load condition.
|
|
Table 2.10 Limit Levels for Stack
Emission of the Landfill Gas Generator
|
Parameters
|
Limit Level
|
|
NO2
|
1.91 gs-1
|
|
CO
|
2.48 gs-1
|
|
SO2
|
0.528 gs-1
|
|
Benzene
|
2.47 x 10-4 gs-1
|
|
Vinyl chloride
|
1.88 x 10-5 gs-1
|
|
Gas combustion
temperature
|
450oC
(minimum)
|
|
Exhaust gas exit
temperature
|
723K (minimum) (a)
|
|
Exhaust gas velocity
|
30.0 ms-1 (minimum) (a)
|
|
Note:
(a) Level
under full load condition.
|
|
Gas samples were
collected from the centroid of the stack with stainless steel sampling probe,
into inert sample containers (i.e. Canister and Tedlar
Bag) and transferred to ALS Technichem (HK) Pty Ltd.
(HOKLAS Registration No. 066) laboratory within 24 hours of collection for direct analysis on a gas
chromatography within 48 hours after collection. The flue gas velocity of the gas stream
at the exhaust of thermal oxidize was determined by S-Pitot tube during the
emission sampling.
The stack
emission monitoring programme and monitoring
locations are summarised in Table 2.11 and
illustrated in Figure 2.1, respectively.
Table 2.11 Thermal Oxidiser,
Landfill Gas Flare and Landfill Gas Generator Stack Emission Monitoring Details
|
Monitoring Location
|
Parameter
|
Frequency
|
Monitoring Date
|
|
Stack of
Thermal Oxidiser
|
Laboratory
analysis for
·
NO2
·
CO
·
SO2
·
Benzene
·
Vinyl
chloride
In-situ analysis for
·
Exhaust gas velocity
|
Monthly for the first 12 months of operation and
thereafter at quarterly intervals
|
16 Oct 2023
|
|
Laboratory
analysis for
·
Non-methane organic compounds
|
Quarterly for the 1st year of operation (b)
|
-
|
|
Laboratory
analysis for
·
Ammonia
|
Quarterly
|
-
|
|
·
Gas
combustion temperature
·
Exhaust
temperature
·
Exhaust gas
velocity (a)
|
Continuously
|
1 – 31 Oct 2023
|
|
Stack of
Landfill Gas Flare
|
Laboratory
analysis for
·
NO2
·
CO
·
SO2
·
Benzene
·
Vinyl
chloride In-situ analysis for
· Exhaust gas
velocity
|
Monthly for the first 12 months of operation and
thereafter at quarterly intervals
|
17 Oct 2023
|
|
Laboratory
analysis for
·
Non-methane organic compounds
|
Quarterly for the 1st
year of operation (b)
|
-
|
|
·
Gas combustion
temperature
·
Exhaust
temperature
·
Exhaust
gas velocity (a)
|
Continuously
|
1 – 31 Oct 2023
|
|
Stack of
Landfill Gas Generator
|
Laboratory
analysis for
·
NO2
·
CO
·
SO2
·
Benzene
·
Vinyl
chloride In-situ analysis for
· Exhaust
gas velocity
|
Monthly for the first 12 months of operation and
thereafter at quarterly intervals
|
17 Oct 2023
|
|
Laboratory
analysis for
·
Non-methane organic compounds
|
Quarterly for the 1st year of operation (b)
|
-
|
|
·
Exhaust
temperature
·
Exhaust
gas velocity (a)
|
Continuously
|
1 – 31 Oct 2023
|
|
Notes:
(a) The exhaust gas velocity is calculated based on the
cross-section area of the stack and continuous monitored gas flow and
combustion temperature data.
(b) The monitoring results are being reviewed to determine
if monitoring of this parameter can be terminated upon agreement by the EIAO
Authority, IEC and Project Proponent.
|
|
|
|
|
|
|
Monitoring Schedule for the Reporting Month
The schedule for thermal oxidizer,
landfill gas flare and landfill gas generator stack emission monitoring during
the reporting period is provided in Annex C.
Results and Observations
The thermal
oxidizer, landfill gas flare and landfill gas generator stack emission
monitoring results and detailed continuous monitoring results are summarised in Tables 2.12 - 2.14 and provided in Annex D7, respectively.
Table 2.12 Summary of Thermal
Oxidiser Stack Emission Monitoring in the Reporting Period
|
Parameters
|
Monitoring Results (Range in Bracket)
|
Limit Level
|
|
NO2
|
0.17 gs-1
|
1.58 gs-1
|
|
CO
|
0.03 gs-1
|
0.53 gs-1
|
|
SO2
|
0.79 gs-1
|
0.07 gs-1
|
|
Benzene
|
<2.0 x 10-4 gs-1
|
3.01 x 10-2 gs-1
|
|
Vinyl chloride
|
<1.2 x 10-4 gs-1
|
2.23 x 10-3 gs-1
|
|
Gas combustion
temperature
|
924oC (900oC
– 943oC)
|
850oC
(minimum)
|
|
Exhaust gas exit
temperature
|
1,201K (1,192K –
1,210K)
|
443K (minimum) (a)
|
|
Exhaust gas velocity
|
10.5 ms-1 (b)
|
7.5 ms-1 (minimum) (a)
|
|
Notes:
(a) Level under full load condition.
(b) The exhaust gas velocity
was calculated based on the cross-section area of the stack and the gas flow
and combustion temperature data measured during the stack emission
monitoring.
|
Table 2.13 Summary of Landfill
Gas Flare Stack Emission Monitoring in the Reporting Period
|
Parameters
|
Monitoring
Results (Range in Bracket)
|
Limit Level
|
|
NO2
|
0.02 gs-1
|
0.97 gs-1
|
|
CO
|
0.38 gs-1
|
2.43 gs-1
|
|
SO2
|
<0.01 gs-1
|
0.22 gs-1
|
|
Benzene
|
<3.03 x 10-4 gs-1
|
4.14 x 10-4 gs-1
|
|
Vinyl chloride
|
<7.9 x 10-5 gs-1
|
2.60 x 10-4 gs-1
|
|
Gas combustion
temperature
|
Flare 1: 852oC
(824oC – 959oC)
Flare 2: 909oC
(842oC – 936oC)
|
815oC
(minimum)
|
|
Exhaust gas exit
temperature
|
Flare 1: 1,096K (1,013K –
1,199K)
Flare 2: 1,125K (1,060K –
1,159K)
|
923 K (minimum) (a)
|
|
Exhaust gas velocity
|
5.8 ms-1 (b)
|
9.0 m s-1 (minimum) (a)
|
|
Note:
(a) Level under full load condition.
(b) The exhaust gas
velocity was calculated based on the cross-section area of the stack and the gas
flow and combustion temperature data measured during the stack emission
monitoring.
|
Table 2.14 Summary of Landfill
Gas Generator Stack Emission Monitoring in the Reporting Period
|
Parameters
|
Monitoring Results
(Range in Bracket)
|
Limit Level
|
|
NO2
|
0.06 gs-1
|
1.91 gs-1
|
|
CO
|
1.08 gs-1
|
2.48 gs-1
|
|
SO2
|
<0.001 gs-1
|
0.528 gs-1
|
|
Benzene
|
4.0 x 10-5 gs-1
|
2.47 x 10-4 gs-1
|
|
Vinyl chloride
|
<1.06 x 10-5 gs-1
|
1.88 x 10-5 gs-1
|
|
Exhaust gas exit
temperature
|
ENGA: 857K (837K – 882K)
ENGB : 853K (836K – 872K)
|
723K (minimum) (a)
|
|
Exhaust gas velocity
|
11.6 ms-1 (b)
|
30.0 ms-1 (minimum) (a)
|
|
Note:
(a) Level under full load condition.
(b) The exhaust gas velocity
was calculated based on the cross-section area of the stack and the gas flow
and combustion temperature data measured during the stack emission
monitoring.
|
Limit Level
exceedance was recorded for thermal oxidizer stack emission (SO2) in
the reporting period and actions in accordance with the Event and Action Plan
presented in Annex D3
were undertaken. The thermal oxidizer stack emission (SO2)
exceedance on 16 October 2023 is under investigation.
The Contractor was reminded to implement all
relevant mitigation measures for the construction and operation works and
maintain good site practice. The ET will keep track on the
monitoring data and ensure Contractor’s compliance of the environmental
requirements.
2.2
Noise
Monitoring
2.2.1
Monitoring
Requirements and Equipment
According to the
updated EM&A Manual of the Project, impact noise monitoring was conducted
weekly at the monitoring location (i.e. NM1) to obtain one set of 30-minute
measurement between 07:00 and 19:00 hours on normal weekdays.
The Action and
Limit Levels for operational noise of the Project are provided in Table 2.15
below.
Table 2.15 Action and Limit Levels
for Operational Noise
|
Time Period
|
Action Level (a)
|
Limit Level (b)
|
|
07:00
– 19:00 hrs on all days
|
When
one documented complaint is received from any one of the noise sensitive
receivers (NSRs)
or
75
dB(A) recorded at the monitoring station
|
65
dB(A) at NSRs (c)
|
|
19:00
– 23:00 hrs on all days
|
65
dB(A) at NSRs (c)
|
|
23:00
– 07:00 hrs on all days
|
55
dB(A) at NSRs (c)
|
|
Notes:
(a)
75dB(A) along and at about 100m from the SENTX site boundary was set
as the Action Level.
(b)
Limits specified in the GW-TM and IND-TM for construction and
operational noise, respectively.
(c)
Limit Level only apply to operational noise without
road traffic and construction activities noise.
|
Noise monitoring
was performed by ALS Technichem (HK) Pty Ltd. (HOKLAS
Registration No. 066) using sound level meter at the designated monitoring
station NM1 (see Figure 2.1)
in accordance with the requirements stipulated in the updated
EM&A Manual. Acoustic calibrator was deployed to check the sound
level meter at a known sound pressure level. Details of the deployed equipment
are provided in Table 2.16. Copies of the calibration certificates for
the equipment are presented in Annex
E1.
Table 2.16 Noise Monitoring Details
|
Monitoring
Station (1)
|
Location
|
Parameter
|
Frequency
and Duration
|
Monitoring
Dates
|
Equipment
|
|
NM1
|
SENTX
Site Boundary (North)
|
Leq (30 min) measurement between
07:00 and 19:00 hours on normal weekdays
(Monday to
Saturday)
|
Once per week
for 30 mins during operation
of the Project
|
5, 11, 17, 24,
30 Oct 2023
|
Sound Level
Meter:
Rion NL-52 (S/N:
00643049)
Acoustic
Calibrator:
CAL200 (S/N:
15678)
|
2.2.2
Monitoring
Schedule for the Reporting Month
The schedule for
noise monitoring during the reporting period is provided in Annex C.
2.2.3
Results
and Observations
A total of 4
impact noise monitoring events were scheduled during the reporting
period. Results for noise monitoring are summarised
in Table 2.17. The monitoring results and the graphical
presentation of the data are provided in Annex E2.
Table 2.17 Summary of Operation
Noise Monitoring Results in the Reporting Period
|
Monitoring Station
|
Measured Noise
Level Leq (30 min), dB(A)
|
|
Average
|
Range
|
Action and
Limit Level
|
|
NM1
|
51.4
|
49.5 – 54.0
|
75
|
Major noise
sources identified during the noise monitoring included noise from operations of
the SENTX and the TKO Area 137 Fill Bank, aircrafts and insects.
No Action and
Limit Levels exceedance was recorded for operation noise monitoring in the
reporting period. No action is thus required to be undertaken in
accordance with the Event and Action Plan presented in Annex E3.
2.3
Water
Quality Monitoring
2.3.1
Surface
Water Quality Monitoring
Monitoring Requirements and Equipment
According to the
updated EM&A Manual of the Project, impact surface water quality monitoring
was carried out at the three designated surface water discharge points (i.e.
DP3, DP4 and DP6) at monthly intervals during operation/ restoration phase to
ensure that the SENTX will not cause adverse water quality impact.
The parameters as
listed in Table 2.19 were determined by ALS Technichem
(HK) Pty Ltd. (HOKLAS Registration No. 066).
The Limit Levels of the surface water quality impact monitoring are
provided in Table 2.18.
Table 2.18 Limit Levels for Surface
Water Quality
|
Parameters
|
Limit Level
|
|
DP3
|
|
|
Ammoniacal-nitrogen
|
> 0.5 mg/L
|
|
COD
|
> 80 mg/L
|
|
SS
|
> 30 mg/L
|
|
DP4 & DP6
|
|
|
Ammoniacal-nitrogen
|
> 7.1 mg/L
|
|
COD
|
> 30 mg/L
|
|
SS
|
> 20 mg/L
|
|
Notes:
The limit levels specified
for other parameters in Table 10a of the Technical Memorandum
Standards for Effluents Discharged into Drainage and Sewerage Systems, Inland
and Coastal Waters shall also be followed.
|
The locations of the monitoring stations for
the Project are shown in Figure
2.1. All in situ monitoring instruments were checked, calibrated
and certified by a laboratory accredited under HOKLAS or other international
accreditation scheme before use, and subsequently re-calibrated at 3 monthly
intervals throughout all stages of the surface water quality monitoring
programme. Calibration for a DO meter was carried out before measurement
according to the instruction manual of the equipment model. Details of the
equipment used in the impact surface water quality monitoring works are provided in Table 2.19.
Copies of the calibration certificates for the equipment are presented in Annex F1.
Table 2.19 Impact Surface Water
Quality Monitoring Details
|
Monitoring Station
|
Location
|
Frequency
|
Monitoring Dates
|
Parameter
|
Equipment
|
|
DP3
|
Surface water discharge
point DP3
|
Monthly
|
20 Oct 2023
|
· pH
· Electrical
conductivity (EC)
· DO
· SS
· COD
· BOD5
· TOC
·
Ammoniacal–nitrogen
· Nitrate-nitrogen
· Nitrite–nitrogen
· TKN
· TN
· Phosphate
· Sulphate
· Sulphide
· Carbonate
· Oil & Grease
|
·
Bicarbonate
·
Chloride
·
Sodium
·
Potassium
·
Calcium
·
Magnesium
·
Nickel
·
Manganese
·
Chromium
·
Cadmium
·
Copper
·
Lead
·
Iron
·
Zinc
·
Mercury
·
Boron
|
Horiba U-52G (S/N: NVAE080GT)
|
|
DP4
|
Surface water discharge
point DP4
|
|
DP6
|
Surface water discharge
point DP6
|
Monitoring Schedule for the Reporting Month
The schedule for
surface water quality monitoring during the reporting period is provided in Annex C.
Results and Observations
All the surface
water monitoring results were below the Limit Levels in the reporting
period. No action is
thus required to be undertaken in accordance with the Event and Action Plan
presented in Annex F3.
2.3.2
Leachate
Monitoring
Monitoring Requirements and Equipment
According to the updated EM&A Manual, continuous
monitoring of leachate level and monthly monitoring of effluent quality were
carried out during the operation/ restoration phase.
Reduction of effluent monitoring frequency (dry season)
(from daily to monthly) was approved by EPD on 22 March 2022. Monthly
effluent quality monitoring (dry season) shall be conducted from 23 March
2022. The reduction of effluent
monitoring frequency (wet season) (from daily to monthly) was approved by EPD
on 2 August 2022. Monthly effluent quality monitoring (wet season) shall
be conducted from 3 August 2022.
Temperature, pH and volume of the effluent discharged from
the leachate treatment plant were measured in-situ whereas the parameters as
listed in Table 2.21 were determined
by ALS Technichem (HK) Pty Ltd. (HOKLAS Registration
No. 066).
The Limit Levels
of the leachate monitoring are provided in Table
2.20.
Table 2.20 Limit Levels for Leachate
Levels and Effluent Quality
|
Parameters
|
Limit Level
|
|
Leachate Levels
|
|
|
Leachate levels above the basal liner
|
1 m above the primary liner of the leachate containment system
|
|
Effluent Quality
|
|
Temperature
|
> 43 °C
|
|
pH Value
|
6 – 10
|
|
Volume Discharged
|
>2,000 m³
|
|
Suspended Solids (SS)
|
> 800 mg/L
|
|
Phosphate
|
> 25 mg/L
|
|
Sulphate
|
> 800 mg/L
|
|
Total Inorganic Nitrogen
(a)
|
> 100 mg/L
|
|
Biochemical Oxygen
Demand (BOD)
|
> 800 mg/L
|
|
Chemical Oxygen Demand
(COD)
|
> 2,000 mg/L
|
|
Oil & Grease
|
> 20 mg/L
|
|
Boron
|
> 7,000 µg/L
|
|
Iron
|
> 5 mg/L
|
|
Cadmium
|
> 1 µg/L
|
|
Chromium
|
> 300 µg/L
|
|
Copper
|
> 1,000 µg/L
|
|
Nickel
|
> 700 µg/L
|
|
Zinc
|
> 700 µg/L
|
|
Note:
(a)
Total Inorganic
Nitrogen include Ammoniacal-nitrogen, Nitrite-nitrogen and Nitrate-nitrogen.
|
All in situ monitoring instruments were checked,
calibrated and certified by a laboratory accredited under HOKLAS or other
international accreditation scheme before use, and subsequently re-calibrated
at 3 monthly intervals throughout all stages of the leachate quality monitoring
programme. Details of the equipment used are provided in Table
2.21. Copies of the calibration certificates for the equipment are
presented in Annex F4.
Table 2.21 Leachate Levels and
Effluent Quality Monitoring Details
|
Location
|
Frequency
|
Parameter
|
Monitoring Dates
|
Equipment
|
|
Leachate levels above
the basal liner
|
Continuous
|
Leachate Levels
|
1 – 31 Oct 2023
|
Pairs of pressure
transducers
|
|
Effluent discharged
from LTP
|
Daily for the first 3
months upon full operation of the LTP at wet season (Apr to Sep) and dry
season (Oct to Mar), respectively and reduce to monthly thereafter subject to
the monitoring results of the first 3 months for each season and agreement
with the EIAO Authority, IEC and IC. (a)
|
On-site
Measurements:
·
Volume
·
pH
·
Temperature
Laboratory
analysis:
·
Suspended Solids
·
COD
·
BOD5
·
TOC
·
Ammoniacal–nitrogen
·
Nitrate-nitrogen
·
Nitrite–nitrogen
·
Total Nitrogen
·
Sulphate
·
Phosphate
·
Oil & Grease
·
Alkalinity
·
Chloride
·
Calcium
·
Potassium
·
Magnesium
·
Iron
·
Zinc
·
Copper
·
Chromium
·
Nickel
·
Cadmium
·
Boron
|
5 Oct 2023
|
Lutron PH-208 (S/N: TF30605)
|
|
|
|
|
|
Note:
(a)
Reduction of
monitoring frequency will be subject to the monitoring results to demonstrate
environmentally acceptable performance.
|
Monitoring Schedule for the Reporting Month
The schedule for
leachate monitoring during the reporting period is provided in Annex C.
Results and Observations
The leachate
levels and effluent quality monitoring results are summarised
in Table 2.22 and Table 2.23, respectively. The detailed
monitoring results are provided in Annex F5 and Annex F6, respectively.
Table 2.22 Summary of Leachate
Levels in the Reporting Period
|
Monitoring Location
|
Average Leachate Head Levels (cm) (Range in
Bracket)
|
Limit Level (cm)
|
|
Pump Station No. 1X (Cell 1X)
|
|
Meter No. X-1
|
160 (77 – 251)
|
> 178
|
|
Meter No. X-2 (a)
|
86 (77 – 88)
|
|
|
Average
|
161 (78 – 251)
|
|
|
Pump Station No. 2X (Cell 2X)
|
|
Meter No. X-3
|
245 (76 – 366)
|
> 180
|
|
Meter No. X-4
|
216 (75 – 324)
|
|
|
Average
|
231 (77 – 332)
|
|
|
Pump Station No. 3X (Cell 3X)
|
|
Meter No. X-5 (a)
|
75 (75 – 76)
|
> 175
|
|
Meter No. X-6
|
274 (55 – 366)
|
|
|
Average
|
274 (55 – 366)
|
|
|
Pump Station No. 4X (Cell 4X)
|
|
Meter No. X-7
|
287 (54 – 417)
|
> 186
|
|
Meter No. X-8
|
287 (63 – 404)
|
|
|
Average
|
287 (59 – 411)
|
|
|
Note:
(a)
Meter No. X-2 at Pump Station No. 1X and Meter No. X-5 at Pump Station
No. 3X are on standby from 8 October to 31 October 2023 and from 4 October to
31 October 2023, respectively.
|
Table 2.23 Summary of Effluent Quality
Monitoring Results in the Reporting Period
|
Parameters
|
Monitoring Results
|
Limit Level
|
|
Effluent Discharged from LTP
|
|
|
|
Temperature
|
°C
|
35.4
|
|
> 43 °C
|
|
|
pH
Value
|
pH unit
|
8.3
|
|
6 – 10
|
|
|
Volume
Discharged
|
m³
|
1080
|
|
>2,000 m³
|
|
|
Suspended
Solids (SS)
|
mg/L
|
31.1
|
|
> 800
mg/L
|
|
|
Phosphate
|
mg/L
|
2.82
|
|
> 25 mg/L
|
|
|
Sulphate
|
mg/L
|
252
|
|
> 800
mg/L
|
|
|
Total
Inorganic Nitrogen (a)
|
mg/L
|
79.22
|
|
> 100
mg/L
|
|
|
BOD
|
mg/L
|
20
|
|
> 800
mg/L
|
|
|
COD
|
mg/L
|
885
|
|
> 2,000
mg/L
|
|
|
Oil
& Grease
|
mg/L
|
<5
|
|
> 20 mg/L
|
|
|
Boron
|
µg/L
|
4610
|
|
> 7,000
µg/L
|
|
|
Iron
|
mg/L
|
1.6
|
|
> 5 mg/L
|
|
|
Cadmium
|
µg/L
|
<1.0
|
|
> 1 µg/L
|
|
|
Chromium
|
µg/L
|
105
|
|
> 300
µg/L
|
|
|
Copper
|
µg/L
|
12
|
|
> 1,000
µg/L
|
|
|
Nickel
|
µg/L
|
97
|
|
> 700
µg/L
|
|
|
Zinc
|
µg/L
|
98
|
|
> 700
µg/L
|
|
|
Note:
(a)
Total Inorganic
Nitrogen include Ammoniacal-nitrogen, Nitrite-nitrogen and Nitrate-nitrogen.
|
Limit Levels exceedances
were recorded for leachate level monitoring in the reporting period and actions
in accordance with the Event and Action Plan presented in Annex F3 were undertaken.
The leachate level exceedances at Pump Station No. 1X from 9 October to 17
October 2023, Pump Station No. 2X from 11 October to 31 October 2023, Pump
Station No. 3X from 9 October to 31 October 2023 and Pump Station No. 4X from 9
October to 31 October 2023 are under investigation.
The Contractor was reminded to implement all
relevant mitigation measures for the construction and operation works and
maintain good site practice. The ET will keep track on the
monitoring data and ensure Contractor’s compliance of the environmental
requirements.
All effluent
quality monitoring results were below the Limit Levels in the reporting period.
No action is thus required to be undertaken in accordance with the Event and
Action Plan presented in Annex
F3.
2.3.3
Groundwater
Monitoring
Monitoring Requirements and Equipment
According to the
updated EM&A Manual of the Project with incorporation of the proposed updates under the Amendment Summary
approved by EPD on 15 June 2020, groundwater monitoring was carried out
at 14 perimeter groundwater monitoring wells (including 3 up-gradient wells and
11 down-gradient wells) (i.e. MWX-1 to MWX-14) to monitor the groundwater
quality and level of the perimeter groundwater monitoring wells at monthly
interval.
The Limit Levels
for groundwater quality is provided in Table 2.24 below.
Table 2.24 Limit Levels for
Groundwater Quality
|
Location
|
Limit Levels
|
|
Ammoniacal-nitrogen (mg
L-1)
|
COD (mg L-1)
|
|
MWX-1
|
5.00
|
30
|
|
MWX-2
|
5.00
|
30
|
|
MWX-3
|
5.00
|
30
|
|
MWX-4
|
7.63
|
36
|
|
MWX-5
|
5.00
|
30
|
|
MWX-6
|
5.00
|
46
|
|
MWX-7
|
6.55
|
36
|
|
MWX-8
|
15.85
|
50
|
|
MWX-9
|
7.30
|
71
|
|
MWX-10
|
5.00
|
30
|
|
MWX-11
|
5.00
|
30
|
|
MWX-12
|
5.00
|
30
|
|
MWX-13
|
5.00
|
30
|
|
MWX-14
|
5.00
|
30
|
A bladder pump
with Teflon sampling tube and adjustable discharge rates was used for purging
and taking of groundwater sample from the monitoring wells. Filtered
groundwater samples were collected by connecting a disposable in-line filter
system to the tubing of the sampling pump, prior to storage and analysis by ALS
Technichem (HK) Pty Ltd. (HOKLAS Registration No.
066).
A portable dip
meter with 5mm accuracy was used for measurement of groundwater level at each
well. The dip meter has an audio indicator of the water level and was
checked before use.
The measurements
of pH and electrical conductivity (EC) were undertaken in situ. In situ monitoring instruments in compliance
with the specifications listed under Section 4.3.2 of the updated EM&A Manual
were used to undertake the groundwater quality monitoring for the
Project.
Details of the equipment
used and the monitoring locations are summarised in Table 2.25 and illustrated in Figure 2.1, respectively.
Copies of the calibration certificates for the equipment are presented in Annex F7.
Table 2.25 Groundwater Monitoring
Details
|
Monitoring Location
|
Frequency
|
Parameter
|
Monitoring Dates
|
Equipment
|
|
All groundwater monitoring wells (MWX-1 to
MWX-14)
|
Monthly
|
·
Water level
·
pH
·
EC
·
COD
·
BOD5
·
TOC
·
Ammoniacal–nitrogen
·
Nitrate-nitrogen
·
Nitrite–nitrogen
· TKN
· TN
· Sulphate
· Sulphide
· Carbonate
· Bicarbonate
·
Phosphate
|
·
Chloride
·
Sodium
·
Potassium
·
Calcium
·
Magnesium
·
Nickel
·
Manganese
·
Chromium
·
Cadmium
·
Copper
·
Lead
·
Iron
·
Zinc
·
Mercury
·
Boron
|
12 Oct 2023
|
Horiba U-52G (S/N: NVAE080GT)
|
|
|
|
|
|
|
Monitoring Schedule for the Reporting Month
The schedule for groundwater
quality monitoring during the reporting period is provided in Annex C.
Results and Observations
The groundwater
quality monitoring results and detailed monitoring results are summarised in Table 2.26 and provided in Annex F8, respectively.
Table 2.26 Summary of Groundwater
Monitoring Results in the Reporting Period
|
Location
|
Ammoniacal-nitrogen
(mg L-1)
|
COD
(mg L-1)
|
|
Monitoring
Results
|
Limit
Levels
|
Monitoring
Results
|
Limit
Levels
|
|
MWX-1
|
0.26
|
5.00
|
9
|
30
|
|
MWX-2
|
1.20
|
5.00
|
5
|
30
|
|
MWX-3
|
1.43
|
5.00
|
12
|
30
|
|
MWX-4
|
0.18
|
7.63
|
13
|
36
|
|
MWX-5
|
0.64
|
5.00
|
14
|
30
|
|
MWX-6
|
2.23
|
5.00
|
35
|
46
|
|
MWX-7
|
6.03
|
6.55
|
31
|
36
|
|
MWX-8
|
4.76
|
15.85
|
26
|
50
|
|
MWX-9
|
0.50
|
7.30
|
32
|
71
|
|
MWX-10
|
<0.01
|
5.00
|
7
|
30
|
|
MWX-11
|
<0.01
|
5.00
|
7
|
30
|
|
MWX-12
|
<0.01
|
5.00
|
4
|
30
|
|
MWX-13
|
<0.01
|
5.00
|
3
|
30
|
|
MWX-14
|
0.06
|
5.00
|
2
|
30
|
All groundwater monitoring
results were below the Limit Levels in the reporting period. No action is thus
required to be undertaken in accordance with the Event and Action Plan
presented in Annex F3.
2.4
Landfill
Gas Monitoring
2.4.1
Monitoring
Requirements
According to the
updated EM&A Manual of the Project, landfill gas monitoring was carried out at the perimeter of
the waste boundary (monitoring wells), area between the SENTX Site boundary and
the waste boundary (surface emission), occupied on-site building, service
voids, utilities pit and manholes in the vicinity of the SENTX (build-up of
landfill gas) during the operation/restoration phase.
The Limit Levels
for landfill gas monitoring is provided in Table 2.27 below.
Table 2.27 Limit Levels for Landfill
Gas Constituents
|
Parameters
|
Monitoring Location
|
Limit Level (% (v/v))
|
|
Perimeter Landfill
Gas Monitoring Wells (a)
|
|
|
Methane & Carbon Dioxide
|
|
Methane
|
Carbon Dioxide
|
|
|
LFG1
|
1.0
|
3.2
|
|
|
LFG2
|
1.0
|
4.3
|
|
|
LFG3
|
1.0
|
6.3
|
|
|
LFG4
|
1.0
|
7.0
|
|
|
LFG5
|
1.0
|
3.4
|
|
|
LFG6
|
1.0
|
9.1
|
|
|
LFG7
|
1.0
|
1.5
|
|
|
LFG8
|
12.6
|
2.4
|
|
|
LFG9
|
2.5
|
1.7
|
|
|
LFG10
|
3.5
|
1.6
|
|
|
LFG11
|
3.0
|
2.0
|
|
|
LFG12
|
13.2
|
1.5
|
|
|
LFG13
|
22.5
|
2.7
|
|
|
LFG14
|
5.2
|
1.8
|
|
|
LFG15
|
18.2
|
2.0
|
|
|
LFG16
|
1.0
|
2.0
|
|
|
LFG17
|
17.8
|
2.4
|
|
|
LFG18
|
2.3
|
2.1
|
|
|
LFG19
|
6.3
|
3.1
|
|
|
LFG20
|
1.0
|
4.6
|
|
|
LFG21
|
1.0
|
4.8
|
|
|
LFG22
|
1.0
|
4.0
|
|
|
LFG23
|
1.0
|
10.3
|
|
|
LFG24
|
1.0
|
4.7
|
|
|
GP1
|
1.0
|
10.6
|
|
|
GP2 (shallow)
|
1.0
|
11.4
|
|
|
GP2 (deep)
|
1.0
|
10.4
|
|
|
GP3 (shallow)
|
1.0
|
6.9
|
|
|
GP3 (deep)
|
1.0
|
5.6
|
|
|
GP4 (shallow)
|
1.0
|
11.6
|
|
|
GP4 (deep)
|
1.0
|
7.7
|
|
|
GP5 (shallow)
|
1.0
|
10.8
|
|
|
GP5 (deep)
|
1.0
|
7.5
|
|
|
GP6
|
1.0
|
8.4
|
|
|
GP7
|
1.0
|
4.5
|
|
|
GP12
|
1.0
|
2.3
|
|
|
GP15
|
1.0
|
2.2
|
|
|
P7
|
1.0
|
2.5
|
|
|
P8
|
1.0
|
1.7
|
|
|
P9
|
1.0
|
2.7
|
|
Service Voids,
Utilities Pits and Manholes
|
|
Methane (or flammable
gas)
|
Service voids,
utilities pits and manholes
|
1% by volume
|
|
Permanent Gas
Monitoring System
|
|
Methane (or flammable
gas)
|
Permanent Gas
Monitoring System
|
1% by volume (20% LEL)
|
|
Area Between the
SENTX Site Boundary and Waste Boundary (Surface Emission)
|
|
Flammable gas
|
Area between SENTX
site boundary and waste boundary
|
30 ppm
|
Notes:
(a)
Limit Levels established based on the pre-operation phase baseline and
additional landfill gas monitoring results in the Pre-operation Baseline
Monitoring Report.
|
Gas analysers in compliance with the specifications
listed under Section 5.4.1 of the updated EM&A Manual were used to monitor
the gas parameters at the landfill gas monitoring wells, service voids,
utilities pits and manholes. The gas analyser was calibrated by a
laboratory accredited under HOKLAS at yearly intervals and checked before use
to ensure the validity and accuracy of the results. A portable dip meter
was used to monitor the water level in the monitoring wells.
Permanent gas monitoring systems with pre-set alarm
levels for methane at 20% lower explosive limit (LEL, equivalent to 1% methane
gas (v/v)) were installed and
operated in all occupied on-site buildings at SENTX. A central
control panel is equipped to alert site personnel when the gas concentration at
any detector reaches the alarm level.
The equipment
used in the landfill gas monitoring programme is summarised in Table 2.28. The landfill gas
monitoring locations for perimeter landfill gas monitoring wells and service voids, utilities
and manholes along the Site boundary are illustrated in Figure 2.3 and Annex G1, respectively.
Copies of the calibration certificates for the equipment are presented in Annex G2.
Table 2.28 Landfill Gas Monitoring
Details
|
Monitoring Location
|
Frequency
|
Parameter
|
Monitoring Dates
|
Equipment
|
|
Perimeter landfill gas monitoring wells (LFG1 to
LFG24, P7 to P9, GP1 to GP7, GP12 and GP15)
|
Monthly
|
·
Methane
·
Carbon dioxide
·
Oxygen
·
Atmospheric pressure
|
3 Oct 2023
|
GA5000 (S/N: G507306)
|
|
Service voids, utilities and manholes along the
Site boundary and within the SENTX Site (UU1 to UU28)
|
Monthly
|
·
Methane
·
Carbon dioxide
·
Oxygen
|
3 Oct 2023
|
GA5000 (S/N: G507306)
|
|
Permanent gas monitoring system in all occupied
on-site buildings
|
Continuous
|
·
Methane (or flammable gas) by permanent gas monitoring system
|
1 – 31 Oct 2023
|
Permanent gas monitoring system
|
|
Areas
between the SENTX Site boundary and the waste boundary and location of
vegetation stress
|
Quarterly
|
·
Flammable gas emitted from the ground surface
|
-
|
GMI Leak Surveyor (S/N: 554846)
|
|
Bulk
gas sampling at least 2 of the perimeters LFG monitoring wells
|
Quarterly
|
·
Methane
·
Carbon dioxide
·
Oxygen
·
Nitrogen
·
Carbon monoxide
·
Other flammable gas
|
-
|
Gas sampling pump and Tedlar
bags
|
2.4.2
Monitoring
Schedule for the Reporting Month
The schedule for
landfill gas monitoring during the reporting period is provided in Annex C.
2.4.3
Results
and Observations
The landfill gas
monitoring results are summarised and provided in Tables
2.29 - 2.30 and Annex G3, respectively.
Table 2.29 Summary of
Landfill Gas Monitoring Results at Perimeter LFG Monitoring Wells in the
Reporting Period
|
Location
|
Methane (% (v/v))
|
Carbon Dioxide (% (v/v))
|
|
Monitoring Results
|
Limit Levels (a)
|
Monitoring Results
|
Limit Levels (a)
|
|
LFG1
|
0.1
|
1.0
|
1.6
|
3.2
|
|
LFG2
|
0.1
|
1.0
|
2.2
|
4.3
|
|
LFG3
|
0.1
|
1.0
|
0.0
|
6.3
|
|
LFG4
|
0.0
|
1.0
|
0.1
|
7.0
|
|
LFG5
|
0.0
|
1.0
|
0.1
|
3.4
|
|
LFG6
|
0.0
|
1.0
|
0.0
|
9.1
|
|
LFG7
|
0.0
|
1.0
|
0.0
|
1.5
|
|
LFG8
|
0.0
|
12.6
|
0.0
|
2.4
|
|
LFG9
|
0.0
|
2.5
|
0.0
|
1.7
|
|
LFG10
|
0.0
|
3.5
|
0.0
|
1.6
|
|
LFG11
|
0.0
|
3.0
|
0.0
|
2.0
|
|
LFG12
|
0.0
|
13.2
|
0.0
|
1.5
|
|
LFG13
|
0.0
|
22.5
|
0.0
|
2.7
|
|
LFG14
|
0.0
|
5.2
|
0.0
|
1.8
|
|
LFG15
|
0.0
|
18.2
|
0.0
|
2.0
|
|
LFG16
|
0.0
|
1.0
|
0.0
|
2.0
|
|
LFG17
|
0.0
|
17.8
|
0.0
|
2.4
|
|
LFG18
|
0.0
|
2.3
|
0.0
|
2.1
|
|
LFG19
|
0.0
|
6.3
|
0.1
|
3.1
|
|
LFG20
|
0.0
|
1.0
|
0.1
|
4.6
|
|
LFG21
|
0.0
|
1.0
|
0.3
|
4.8
|
|
LFG22
|
0.0
|
1.0
|
0.0
|
4.0
|
|
LFG23
|
0.0
|
1.0
|
0.0
|
10.3
|
|
LFG24
|
0.0
|
1.0
|
0.0
|
4.7
|
|
GP1
|
0.0
|
1.0
|
6.8
|
10.6
|
|
GP2 (shallow)
|
0.0
|
1.0
|
0.9
|
11.4
|
|
GP2 (deep)
|
0.0
|
1.0
|
0.0
|
10.4
|
|
GP3 (shallow)
|
0.0
|
1.0
|
0.2
|
6.9
|
|
GP3 (deep)
|
0.0
|
1.0
|
0.1
|
5.6
|
|
GP4 (shallow)
|
0.0
|
1.0
|
1.3
|
11.6
|
|
GP4 (deep)
|
0.0
|
1.0
|
0.4
|
7.7
|
|
GP5 (shallow)
|
0.0
|
1.0
|
1.7
|
10.8
|
|
GP5 (deep)
|
0.0
|
1.0
|
0.1
|
7.5
|
|
GP6
|
0.0
|
1.0
|
4.4
|
8.4
|
|
GP7
|
0.0
|
1.0
|
0.1
|
4.5
|
|
GP12
|
0.1
|
1.0
|
0.0
|
2.3
|
|
GP15
|
0.1
|
1.0
|
0.0
|
2.2
|
|
P7
|
0.1
|
1.0
|
0.1
|
2.5
|
|
P8
|
0.1
|
1.0
|
0.0
|
1.7
|
|
P9
|
0.2
|
1.0
|
0.0
|
2.7
|
Notes:
(a) Limit Levels established based on the
pre-operation phase baseline and additional landfill gas monitoring results
in the Pre-operation Baseline Monitoring Report.
|
Table 2.30 Summary of Landfill
Gas Monitoring Results at Service Voids, Utilities Pits and Manholes in the
Reporting Period
|
Location
|
Methane (% (v/v))
|
|
Monitoring Results
|
Limit Levels
|
|
UU01
|
0.1
|
1.0
|
|
UU02
|
0.1
|
1.0
|
|
UU03
|
0.0
|
1.0
|
|
UU04
|
0.0
|
1.0
|
|
UU05
|
0.0
|
1.0
|
|
UU06
|
0.0
|
1.0
|
|
UU07
|
0.0
|
1.0
|
|
UU08
|
0.0
|
1.0
|
|
UU09
|
0.0
|
1.0
|
|
UU10
|
0.0
|
1.0
|
|
UU11
|
0.0
|
1.0
|
|
UU12
|
Voided due to latest site programme and
on-going operation work
|
1.0
|
|
UU13
|
0.0
|
1.0
|
|
UU14
|
0.0
|
1.0
|
|
UU15
|
0.0
|
1.0
|
|
UU16
|
0.0
|
1.0
|
|
UU17
|
Voided due to latest site programme and
on-going operation work
|
1.0
|
|
UU18
|
Voided due to latest site programme and
on-going operation work
|
1.0
|
|
UU19
|
0.0
|
1.0
|
|
UU20
|
0.0
|
1.0
|
|
UU21
|
0.0
|
1.0
|
|
UU22
|
0.0
|
1.0
|
|
UU23
|
0.0
|
1.0
|
|
UU24
|
0.0
|
1.0
|
|
UU25
|
0.0
|
1.0
|
|
UU26
|
0.0
|
1.0
|
|
UU27
|
0.0
|
1.0
|
|
UU28
|
0.0
|
1.0
|
The alarm of the permanent gas monitoring
systems with pre-set levels for methane at 20% lower explosive limit
(LEL, equivalent to 1% methane gas (v/v)) was not triggered at all occupied on-site buildings at SENTX in October 2023.
All the landfill
gas monitoring results were below the Limit Levels in the reporting
period. No action is thus required to be undertaken in accordance with
the Event and Action Plan presented in Annex G4.
2.5
Landscape
and Visual Monitoring
2.5.1
Monitoring
Requirements
According to the
updated EM&A Manual of the Project, the monthly landscape and visual audit
was conducted on 18 October 2023 to monitor the implementation of the landscape and visual mitigation measures
during operation/ restoration phase.
All relevant
environmental mitigation measures listed in the approved EIA Report and the
updated EM&A Manual and their implementation status are summarized in Annex B.
2.5.2
Results
and Observations
The Contractor
has implemented environmental mitigation measures as stated in the approved EIA
Report and the EM&A Manual.
Regarding the
landscape and visual audit, the Contractor was reminded to maintain the advance
screen planting works regularly to ensure effective screening of views of
project works from the High Junk Peak Trail.
2.6
EM&A Site Inspection
Site inspections were carried out on a weekly
basis with the Contractor, IEC and ER to monitor the implementation of proper
environmental pollution control and mitigation measures under the Project. In
the reporting period, 4 site inspections were carried out on 5, 12, 19 and 26
October 2023.
Key observations during
the site inspections are summarised in Table 2.31.
Table 2.31 Key
Observations Identified during the Site Inspection in this Reporting Month
|
Inspection
Date
|
Environmental
Observations and Recommendations
|
|
5 October 2023
|
· The Contractor shall remove the
general refuse accumulated at DP3, X10 channel and DP4 outlet regularly to
ensure they are functioning properly at all times.
· The Contractor shall clean up the
algae accumulated at DP6 Wetsep to ensure it is
functioning properly at all times.
· The Contractor shall remove the
general refuse and chemical waste accumulated near Towngas
plant and dispose of the chemical waste separately.
|
|
12 October 2023
|
· The Contractor shall cover the stockpile
of dusty materials near Towngas plant by impervious
sheeting to minimise dust impact.
· The Contractor shall remove the
deposited silt and grit accumulated at X10 channel and maintain the silt
fencing along X10 channel to minimise SS runoff to the channel.
|
|
19 October 2023
|
· The Contractor shall remove the
deposited silt, grit and general refuse accumulated at X10 channel and
channel near site entrance regularly to ensure they are functioning properly
at all times.
· The Contractor shall review the
treatment capacity of the Wetseps at DP3 and DP4 to
ensure all surface water is treated properly before discharge.
· The Contractor shall arrange
regular cleaning and removal of deposits along the main haul road, especially
near site entrance to minimise mud to be carried on the public road.
|
|
26 October 2023
|
· The Contractor shall remove the
deposited silt and grit accumulated at X10 channel regularly and maintain the
silt fencing along the channel to minimise SS runoff to the channel.
|
The Contractor
has rectified most of the observations identified during environmental site
inspections in the reporting period. Key environmental deficiencies identified and the corresponding rectification actions are
presented in Table 2.32.
Table 2.32 Summary of Environmental
Deficiencies Identified and Corresponding Rectification Actions
|
Deficiencies
|
Rectifications Implemented
|
Proposed Additional Control
Measures
|
|
|
Surface Water
|
|
|
Intercepting channels &
drainage system
|
·
Reviewed drainage plan.
|
·
Addition of channels.
·
Expedite the construction of permanent sediment trap and discharge
culverts.
|
|
DP channels (design & regular
silt removal)
|
·
Carried out regular maintenance and cleaning of
channels.
·
DP4 channel: Area near the channel was paved with
concrete and a bund was built.
·
DP6 channel: Gravel piles on the channel were
covered with concrete which serve as blocks for running water and to divide
the channel into several sections. A pump was placed in the water zone in the
upstream section to pump water to the Wetsep for
treatment prior to the discharge to the last section before the weir
plate.
·
DP6: Pipes through the gravel piles between
different channel sections were covered with geotextiles to block debris and
silt.
|
N.A.
|
|
Stockpiles & exposed soil
|
·
Installed silt fencing near surface water channel
along DP6 channel.
|
·
Improve soil covering.
·
Compaction and cover for stockpiles and soil slopes.
|
|
|
Wetsep (treatment capacity & number)
|
·
Reviewed Wetsep capacity.
·
Chemicals dosage of the Wetsep was increased
to enhance the efficiency.
|
·
Install additional Wetsep.
|
|
|
Backflow / ponding during heavy
rainfall
|
·
Raised with EPD (LDG) and CEDD.
|
N.A.
|
|
|
|
|
|
|
2.7
Waste Management Status
The Contractor has
registered as chemical waste producer under the Contract. Sufficient
numbers of receptacles were available for general refuse collection and
sorting.
As informed by
the Contractor, waste generated during this reporting period include mainly
chemical waste. Reference has been made to the waste flow table prepared
by the Contractor. The quantities of different types of wastes and
imported fill materials are summarized in Table 2.33.
Table
2.33 Quantities of Different Waste Generated and
Imported Fill Materials
|
Month/
Year
|
Inert C&D Materials (a)
(in ‘000m3)
|
Imported Fill
(in ‘000kg) (b)
|
Inert Construction Waste Re-used
(in ‘000m3)
|
Non-inert Construction Waste ©
(in ‘000m3)
|
Recyclable Materials (d) (in
‘000kg)
|
Yard Waste (in ‘000kg)
|
Chemical Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
Y Park
|
SENT
|
|
1 – 31 Oct 23
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
0
|
1.180
|
|
Notes:
(a)
Inert construction
wastes include hard rock and large broken concrete, and materials disposed as
public fill. Density assumption: 1.6 (kg/L) for public fill.
(b)
Imported fill refers to
materials generated from other project for on-site
reuse.
(c)
Non-inert construction
wastes include general refuse disposed at landfill. Density assumption: 0.9
(kg/L) for general refuse.
(d)
Recyclable materials
include metals, paper, cardboard, plastics and others.
|
2.8
Implementation
Status of Environmental Mitigation Measures
A summary of the
Environmental Mitigation Implementation Schedule is presented in Annex B. The necessary
mitigation measures were implemented properly for the Project.
2.9
Summary of Exceedances of the
Environmental Quality Performance Limit
The operation/ restoration phase noise and landfill gas
monitoring results complied with the Action and Limit Levels in the reporting
period.
One exceedance of Limit Level for thermal oxidizer stack
emission (SO2) was recorded for air quality monitoring in the reporting
period. The thermal oxidizer stack emission (SO2) exceedance
on 16 October 2023 was considered Project related upon further investigation.
Seventy-six exceedances of the Limit Level for
leachate level were recorded for water quality monitoring in the reporting
period. The leachate level exceedances at Pump Station No. 1X from 9 October to
17 October 2023, Pump Station No. 2X from 11 October to 31 October 2023, Pump
Station No. 3X from 9 October to 31 October 2023 and Pump Station No. 4X from 9
October to 31 October 2023 were considered Project related upon further
investigation.
Cumulative
statistics on exceedances is provided in Annex H.
2.10
Summary of Complaints,
Notification of Summons and Successful Prosecutions
There were no
complaints, notification of summons or prosecution recorded in the reporting
period.
Statistics on
complaints, notifications of summons, successful prosecutions are summarised in Annex H.
3
Future
Key Issues
3.1
Construction Programme for the Coming Month
As informed by
the Contractor, the major works for the Project in November
2023 will be:
·
Testing and commissioning of CCTV system at
infrastructure area; and
·
Restoration of Phase 1 Cell 1X.
3.2
Key
Issues for the Coming Month
Potential
environmental impacts arising from the above upcoming construction activities
in the next reporting period of November 2023 are mainly associated with dust emission from the
exposed area and loading and unloading operation of dusty materials.
3.3
Monitoring Schedule for the
Coming Month
The tentative
schedule for environmental monitoring in November 2023 is provided in Annex I.
4
Conclusion
and Recommendation
This EM&A Report presents the findings of
the EM&A activities undertaken during the period from 1 to 31 October 2023
in accordance with the updated EM&A Manual and the requirements of the
Environmental Permit (EP-308/2008/B).
Air quality (24-hour TSP, odour, thermal oxidiser,
landfill gas flare, landfill gas generator stack emission), noise, water
quality (surface water, leachate and groundwater) and landfill gas monitoring
were carried out in the reporting period. Results for air quality (odour,
landfill gas flare and landfill gas generator stack emission), noise, water
quality (surface water and groundwater) and landfill gas monitoring complied
with the Action and Limit Levels in the reporting period. One exceedance
of Limit Level for thermal oxidizer stack emission (SO2) and
seventy-six exceedances of the Limit Level for leachate level were recorded in the reporting period.
Environmental
site inspections were carried out during the reporting period.
Recommendations on remedial actions were given to the Contractor for the
deficiencies identified during the site inspections.
There were no
complaints, notification of summons or prosecution recorded in the reporting
period.
The ET will keep
track on the construction and operation/restoration works to confirm compliance
of environmental requirements and the proper implementation of all necessary
mitigation measures.
