Contents
1.1
Background
1.2
Project
Description
1.3
Scope of the EM&A Report
1.4
Project Organisation
1.5
Summary of Construction Works
1.6
Summary of EM&A Programme
Requirements
1.7
Status of Statutory Environmental Compliance with the
Environmental Permit
1.8
Status of Other Statutory Environmental Requirements
2.1
Air Quality Monitoring
2.2
Noise Monitoring
2.3
Water Quality Monitoring
2.4
Landfill Gas Monitoring
2.5
Landscape and Visual Monitoring
2.6
EM&A Site Inspection
2.7
Waste Management Status
2.8
Implementation Status of Environmental Mitigation Measures
2.9
Summary of Exceedances of the Environmental Quality
Performance Limit
2.10
Summary of Complaints, Notification of Summons and
Successful Prosecutions
3.1
Construction Programme for the
Coming Month
3.2
Key Issues for the Coming Month
3.3
Monitoring Schedule for the Coming Month
4
Conclusion and Recommendation
Annexes
Annex
B Environmental Mitigation Implementation Schedule
Annex
C Monitoring Schedule for This Reporting Period
Annex
D Air Quality
Annex D1 Calibration Certificates for Dust
Monitoring Equipment
Annex D2 24-hour TSP Monitoring Results
Annex D3 Event and Action Plan for Air Quality
Monitoring
Annex D4 Meteorological Data
Annex D5 Certificates of the Qualified Odour
Panelist
Annex D6 Odour Monitoring Results
Annex
E Noise
Annex E1 Calibration Certificates for
Noise Monitoring Equipment
Annex E2 Noise Monitoring Results
Annex E3 Event and Action Plan for Noise
Monitoring
Annex
F Water Quality
Annex F1 Calibration Certificates for
Surface Water Quality Monitoring Equipment
Annex F2 Surface Water Quality Monitoring
Results
Annex F3 Event and Action Plan
for Water Quality Monitoring
Annex
F4 Calibration Certificates for Effluent Quality Monitoring
Equipment
Annex
F5 Leachate Levels Monitoring Results
Annex
F6 Effluent Quality Monitoring Results
Annex
F7 Calibration Certificates for Groundwater Monitoring Equipment
Annex
F8 Groundwater Monitoring Results
Annex
G Landfill Gas
Annex G1 Landfill Gas
Monitoring Locations for Service Voids, Utilities and Manholes Along the Site
Boundary and Within the SENTX Site
Annex G2
Calibration Certificates for Landfill Gas Monitoring Equipment
Annex G3 Landfill Gas Monitoring Results
Annex G4 Event and Action Plan
for Landfill Gas Monitoring
Annex
I Monitoring Schedule
for the Next Reporting Period
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. ERM-Hong Kong, Limited (ERM) is commissioned
to undertake the role of Environmental Team (ET) for the construction,
operation/restoration and aftercare of SENTX Project (“the Project”) in
accordance with the requirements specified in the Environmental Permit (EP),
updated Environmental Monitoring and Audit (EM&A) Manual, the approved
Environmental Impact Assessment (EIA) Report of the Project taking account of
the latest design and other relevant statutory requirements. The construction
(not including works related to site clearance and preparation) and operation
of the Project commenced on 2 January 2019 and 21 November 2021, respectively.
This Monthly
EM&A report presents the EM&A works carried out during the period from
1 to 31 July 2023 for the
Project in accordance with the updated EM&A Manual.
Exceedance of Action and Limit Levels
for Air Quality
No exceedance
of Action and Limit Levels for operation/restoration phase air quality
monitoring was recorded in the reporting period.
Exceedance of Action and Limit Levels
for Noise
No exceedance
of Action and Limit Levels for operation/restoration phase noise monitoring was
recorded in the reporting period.
Exceedance of Action and Limit Levels
for Water Quality
One exceedance
of the Limit Level for groundwater (Chemical Oxygen Demand (COD)) was recorded
for water quality impact monitoring in the reporting period. The groundwater (COD) exceedance at MWX-7 on
11 July 2023 was considered non Project related upon
further investigation.
Exceedance of Action and Limit Levels
for Landfill Gas
No exceedance
of Action and Limit Levels for operation/restoration phase landfill gas
monitoring was recorded in the reporting period.
Environmental Complaints, Summons and
Prosecutions
There were no
complaints, notification of summons or prosecution recorded in the reporting
period.
Reporting Change
There
was no reporting change in the reporting period.
Future Key Issues
Potential
environmental impacts arising from the upcoming construction/ operational
activities in the next reporting period of August 2023 are mainly associated
with potential surface water impact in the rainy season.
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 ([1]),
approved EIA Report ([2])
taking account of the latest design and other relevant statutory requirements.
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.
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 July 2023 for the construction and operation
works.
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 |
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:
·
Rectification
of latent defects at Landfill Gas (LFG) Plant and Leachate Treatment Plant (LTP);
·
Construction
of SENT soil bench tie in;
·
Maintenance
and improvement of temporary surface water drainage;
·
Civil and E&M works for Diesel Fuel Tank, such as
canopy, pumps and equipment installation;
·
Liner
installation at Cell 4X buttress wall;
·
Rectification
of outstanding minor items for weighmaster house and guard house; 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.
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:
·
One
environmental management meeting was held with the Contractor, ER, ET, IEC and
EPD on 20 July 2023; and
·
Environmental
toolbox trainings on Good Vehicle Maintenance Practice and Renewable Energy were provided on 19
July 2023 and 26 July 2023, respectively by the Contractor to the workers.
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. |
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-RE0245-23 |
Validity from
15 March 2023 to 14 September 2023 |
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.
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 |
6,
12, 18, 24, 30 Jul 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) |
The
schedule for dust monitoring during the reporting period is provided in Annex C.
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) |
118 (83 – 157) |
260 |
260 |
AM2 - SENTX Site Boundary
(West, near DP3) |
120 (80 – 157) |
260 |
260 |
AM3 - SENTX Site Boundary
(West, near RC15) |
116 (81 – 143) |
260 |
260 |
AM4 - SENTX Site Boundary
(West, near EPD building) |
80 (49 – 133) |
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 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.
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: 27
Jul 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 |
The
schedule for odour patrol during the reporting period
is provided in Annex C.
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 |
0 |
||
OP4 |
0 |
||
OP5 |
0 |
||
OP6 |
0 |
||
OP7 |
0 |
||
OP8 |
0 |
||
OP9 |
0 |
||
OP10 |
0 |
||
OP11 |
0 |
|
|
OP12 |
0 |
|
|
OP13 |
0 |
|
|
OP14 |
0 |
|
|
OP15 |
0 |
|
|
OP16 |
1 |
|
|
OP17 |
0 |
|
|
The
potential odour source in the reporting period
included the tipping area at SENTX. 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.
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 |
12
Jul 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 Jul
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 |
11
Jul 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 Jul
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 |
11
Jul 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 Jul
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. |
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 |
0.92
gs-1 |
1.58
gs-1 |
CO |
0.02
gs-1 |
0.53
gs-1 |
SO2 |
<0.01
gs-1 |
0.07
gs-1 |
Benzene |
<1.0
x 10-4 gs-1 |
3.01
x 10-2 gs-1 |
Vinyl
chloride |
<7.0
x 10-5 gs-1 |
2.23
x 10-3 gs-1 |
Gas
combustion temperature |
922oC
(871oC – 959oC) |
850oC
(minimum) |
Exhaust
gas exit temperature |
1,215K
(1,183K – 1,230K) |
443K
(minimum) (a) |
Exhaust
gas velocity |
5.8
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 |
0.04
gs-1 |
2.43
gs-1 |
SO2 |
0.03
gs-1 |
0.22
gs-1 |
Benzene |
1.34
x 10-4 gs-1 |
4.14
x 10-4 gs-1 |
Vinyl
chloride |
<1.07
x 10-4 gs-1 |
2.60
x 10-4 gs-1 |
Gas
combustion temperature |
Flare
1: 867oC (820oC – 930oC) Flare
2: 854oC (830oC – 900oC) |
815oC
(minimum) |
Exhaust
gas exit temperature |
Flare 1: 1,072K
(1,003K – 1,153K) Flare 2: 1,082K
(1,043K – 1,143K) |
923
K (minimum) (a) |
Exhaust
gas velocity |
8.5
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 |
0.032
gs-1 |
1.91
gs-1 |
CO |
0.678
gs-1 |
2.48
gs-1 |
SO2 |
<0.001
gs-1 |
0.528
gs-1 |
Benzene |
3.4
x 10-5 gs-1 |
2.47
x 10-4 gs-1 |
Vinyl
chloride |
<8.9
x 10-6 gs-1 |
1.88
x 10-5 gs-1 |
Exhaust
gas exit temperature |
ENGA: 847K (843K
– 875K) ENGB : 845K (841K
– 872K) |
723K
(minimum) (a) |
Exhaust
gas velocity |
10.6
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. |
No Action and
Limit Level exceedance was recorded for thermal oxidizer, landfill gas flare
and landfill gas generator stack emission 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.
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 |
3,
13, 19, 25, 31 Jul 2023 |
Sound
Level Meter: Rion
NL-52 (S/N: 00643049) Acoustic
Calibrator: CAL200
(S/N: 15678) |
The
schedule for noise monitoring during the reporting period is provided in Annex C.
A
total of 5 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 |
53.5 |
51.7
– 55.3 |
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.
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 |
>
7.1 mg/L |
COD |
>
30 mg/L |
SS |
>
20 mg/L |
DP4
& DP6 |
|
Ammoniacal-nitrogen |
>
0.5 mg/L |
COD |
>
80 mg/L |
SS |
>
30 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 |
11 Jul 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: RSV50V1T) |
DP4 |
Surface water discharge
point DP4 |
|||||
DP6 |
Surface water
discharge point DP6 |
The
schedule for surface water quality monitoring during the reporting period is
provided in Annex C.
No action is thus required to be
undertaken in accordance with the Event and Action Plan presented in Annex F3.
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 Jul 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 |
6
Jul 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. |
The
schedule for leachate monitoring during the reporting period is provided in Annex C.
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 |
77 (75 – 77) |
> 178 |
Meter No. X-2 |
87 (64 – 88) |
|
Average |
82 (71 – 83) |
|
Pump Station No. 2X
(Cell 2X) |
||
Meter No. X-3 |
80 (65 – 90) |
> 180 |
Meter No. X-4 |
78 (66 – 93) |
|
Average |
79 (66 – 92) |
|
Pump Station No. 3X
(Cell 3X) |
||
Meter No. X-5 |
63 (48 – 70) |
> 175 |
Meter No. X-6 |
68 (59 – 78) |
|
Average |
66 (54 – 73) |
|
Pump Station No. 4X
(Cell 4X) |
||
Meter No. X-7 |
58 (50 – 70) |
> 186 |
Meter No. X-8 |
60 (41 – 89) |
|
Average |
59 (49 – 71) |
|
Table
2.23 Summary of Effluent Quality Monitoring
Results in the Reporting Period
Parameters |
Monitoring Results |
Limit Level |
|||
Effluent Discharged
from LTP |
|
|
|||
Temperature |
°C |
33.2 |
|
>
43 °C |
|
pH Value |
pH unit |
8.4 |
|
6
– 10 |
|
Volume Discharged |
m³ |
1,013 |
|
>2,000
m³ |
|
Suspended Solids (SS) |
mg/L |
41 |
|
>
800 mg/L |
|
Phosphate |
mg/L |
3.54 |
|
>
25 mg/L |
|
Sulphate |
mg/L |
324 |
|
>
800 mg/L |
|
Total Inorganic Nitrogen (a) |
mg/L |
52.51 |
|
>
100 mg/L |
|
BOD |
mg/L |
9 |
|
>
800 mg/L |
|
COD |
mg/L |
796 |
|
>
2,000 mg/L |
|
Oil & Grease |
mg/L |
<5 |
|
>
20 mg/L |
|
Boron |
µg/L |
5220 |
|
>
7,000 µg/L |
|
Iron |
mg/L |
2 |
|
>
5 mg/L |
|
Cadmium |
µg/L |
<1.0 |
|
>
1 µg/L |
|
Chromium |
µg/L |
111 |
|
>
300 µg/L |
|
Copper |
µg/L |
<10 |
|
>
1,000 µg/L |
|
Nickel |
µg/L |
101 |
|
>
700 µg/L |
|
Zinc |
µg/L |
99 |
|
>
700 µg/L |
|
Note: (a)
Total Inorganic Nitrogen include Ammoniacal-nitrogen, Nitrite-nitrogen
and Nitrate-nitrogen. |
All
leachate levels and 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.
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 |
10, 11 Jul 2023 |
Horiba U-52G (S/N:
RSV50V1T) |
The
schedule for groundwater quality monitoring during the reporting period is
provided in Annex C.
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 |
0.07 |
5.00 |
7 |
30 |
MWX-2 |
0.60 |
5.00 |
28 |
30 |
MWX-3 |
1.43 |
5.00 |
18 |
30 |
MWX-4 |
2.37 |
7.63 |
19 |
36 |
MWX-5 |
1.47 |
5.00 |
30 |
30 |
MWX-6 |
3.44 |
5.00 |
43 |
46 |
MWX-7 |
5.16 |
6.55 |
41 |
36 |
MWX-8 |
4.53 |
15.85 |
32 |
50 |
MWX-9 |
0.40 |
7.30 |
23 |
71 |
MWX-10 |
<0.01 |
5.00 |
10 |
30 |
MWX-11 |
<0.01 |
5.00 |
7 |
30 |
MWX-12 |
<0.01 |
5.00 |
<2 |
30 |
MWX-13 |
<0.01 |
5.00 |
<2 |
30 |
MWX-14 |
<0.01 |
5.00 |
<2 |
30 |
Limit
Level exceedance was recorded for groundwater monitoring in the reporting
period and actions in accordance with the Event and Action Plan presented in Annex F3 were
undertaken. The groundwater (COD) exceedance at MWX-7 on 11 July 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.
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 |
24 Jul 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 |
24 Jul 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 Jul 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 |
The
schedule for landfill gas monitoring during the reporting period is provided in
Annex C.
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 |
0.2 |
1.0 |
1.8 |
3.2 |
LFG2 |
0.2 |
1.0 |
1.7 |
4.3 |
LFG3 |
0.1 |
1.0 |
0.0 |
6.3 |
LFG4 |
0.1 |
1.0 |
0.0 |
7.0 |
LFG5 |
0.1 |
1.0 |
0.2 |
3.4 |
LFG6 |
0.1 |
1.0 |
0.1 |
9.1 |
LFG7 |
0.1 |
1.0 |
0.0 |
1.5 |
LFG8 |
0.0 |
12.6 |
0.0 |
2.4 |
LFG9 |
0.0 |
2.5 |
0.1 |
1.7 |
LFG10 |
0.0 |
3.5 |
0.0 |
1.6 |
LFG11 |
0.0 |
3.0 |
0.3 |
2.0 |
LFG12 |
0.0 |
13.2 |
0.0 |
1.5 |
LFG13 |
0.5 |
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 |
0.7 |
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 |
0.1 |
4.7 |
GP1 |
0.1 |
1.0 |
8.0 |
10.6 |
GP2 (shallow) |
0.1 |
1.0 |
0.2 |
11.4 |
GP2 (deep) |
0.1 |
1.0 |
8.2 |
10.4 |
GP3 (shallow) |
0.1 |
1.0 |
1.6 |
6.9 |
GP3 (deep) |
0.1 |
1.0 |
0.6 |
5.6 |
GP4 (shallow) |
0.1 |
1.0 |
0.4 |
11.6 |
GP4 (deep) |
0.1 |
1.0 |
0.2 |
7.7 |
GP5 (shallow) |
0.1 |
1.0 |
0.9 |
10.8 |
GP5 (deep) |
0.1 |
1.0 |
0.1 |
7.5 |
GP6 |
0.0 |
1.0 |
1.7 |
8.4 |
GP7 |
0.0 |
1.0 |
0.0 |
4.5 |
GP12 |
0.2 |
1.0 |
0.1 |
2.3 |
GP15 |
0.2 |
1.0 |
0.1 |
2.2 |
P7 |
0.2 |
1.0 |
0.0 |
2.5 |
P8 |
0.2 |
1.0 |
0.1 |
1.7 |
P9 |
0.2 |
1.0 |
0.1 |
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 |
0.2 |
1.0 |
UU02 |
0.1 |
1.0 |
UU03 |
0.1 |
1.0 |
UU04 |
0.1 |
1.0 |
UU05 |
0.0 |
1.0 |
UU06 |
0.0 |
1.0 |
UU07 |
0.1 |
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 |
0.0 |
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 July
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.
According
to the updated EM&A Manual of the Project, the monthly landscape and visual
audit was conducted on 28 July 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.
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.
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 6, 13,
20 and 27 July 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 |
6
July 2023 |
·
The Contractor shall remove the stagnant water
accumulated in the drip tray at DP4 Wetsep and handle
the clean-up materials as chemical waste. |
13
July 2023 |
·
No observations during the site
inspection. |
20
July 2023 |
·
The Contractor shall remove the deposited silt and grit
accumulated at DP3 sediment pit regularly to ensure it is functioning
properly at all times. |
27
July 2023 |
·
No observations during the site
inspection. |
The
Contractor has rectified all 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. |
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 |
Inert
Construction Waste Re-used |
Non-inert
Construction Waste © |
Recyclable
Materials (d)
(in ‘000kg) |
Yard
Waste (in ‘000kg) |
Chemical
Wastes |
||
Rock |
Soil |
Y
Park |
SENT |
||||||
1 –
31 Jul 23 |
0 |
0 |
0 |
0 |
0 |
0 |
11.780 |
0 |
0.800 |
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. |
A
summary of the Environmental Mitigation Implementation Schedule is presented in
Annex B. The necessary
mitigation measures were implemented properly for the Project.
The
operation/ restoration phase air quality, noise and landfill gas monitoring
results complied with the Action and Limit Levels in the reporting period.
One
exceedance of the Limit Levels for groundwater (COD) was recorded for water
quality monitoring in the reporting period. The groundwater (COD) exceedance at
MWX-7 on 11 July 2023 was considered non Project
related upon further investigation.
Cumulative
statistics on exceedances is provided in Annex H.
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.
As
informed by the Contractor, the major works for the Project in August 2023 will
be:
·
Defects
rectification for waste reception area, including weighbridge, vehicle washing
facilities, wheel wash bay and guard house;
·
Installation of ST pipes at Cell 1X
·
Defects
rectification for infrastructure buildings; and
·
Civil and E&M works for Diesel Fuel Tank, such as
canopy, pumps and equipment installation.
Potential
environmental impacts arising from the above upcoming construction activities
in the next reporting period of August 2023 are mainly associated
with potential surface water impact in the rainy season.
The
tentative schedule for environmental monitoring in August 2023 is provided in Annex I.
This EM&A Report presents the
findings of the EM&A activities undertaken during the period from 1 to 31
July 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
(24-hour TSP, odour, thermal oxidiser, landfill gas flare and landfill gas
generator stack emission), noise, water quality (surface water and leachate)
and landfill gas monitoring complied with the Action and Limit Levels in the
reporting period. One
exceedance of the Limit Level for groundwater (COD) was 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.