1
Introduction
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.
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 March 2022 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
|
Frank
Wan
|
2271
3152
|
|
Independent Environmental Checker (IEC)
(Meinhardt Infrastructure and Environment Limited)
|
IEC
|
W.K.
Chiu
|
2858 0738
|
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 defects
at Landfill Gas (LFG) Plant, Leachate Treatment Plant (LTP), infrastructure
area and waste reception area;
·
Landscaping works at
infrastructure area;
·
Rectification of
defects for underground utilities and pipe;
·
Construction of
MSE wall;
·
Construction of
retaining wall at Western boundary planting;
·
Liner works at Cell
4X;
·
Construction of
perimeter channel X10A and X10C along Western bund of Cell 4X;
·
Maintenance
and improvement of temporary surface water drainage; and
·
Utilities
installation along Western bund of Cell 4X.
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 summarised as below:
Ÿ
One
environmental management meeting was held with the Contractor, ER, ET, IEC and EPD
on 24 March 2022; and
Ÿ
Environmental
toolbox trainings on
Chemical Waste Handling and Green Procurement were provided on 9 March
and 23 March 2022 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.: WT00036269-2020
|
Validity
from 21 June 2020 to 30 June 2022
|
|
Billing
Account for Disposal of Construction Waste
|
Chit
Account Number: 5001692
|
Approved
on 28 December 2005
|
|
Registration
as a Chemical Waste Producer (Permit Holder: Chun Wo)
|
5213-839-C3507-10
|
Issued
on 23 August 2018
|
|
Registration
as a Chemical Waste Producer (Permit Holder: REC)
|
5518-839-R2289-06
|
Issued
on 24 October 2019
|
|
Construction
Noise Permit (Permit Holder: GVL)
|
GW-RE1316-21
|
Validity
from 5 January 2022 to 14 June 2022
|
|
Construction
Noise Permit (Permit Holder: Paul Y.)
|
GW-RE0278-22
|
Validity
from 31 March 2022 to 22 September 2022
|
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.
2.1.1
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
|
1, 7, 13, 19,
25, 31 Mar 2022
|
Tisch
TE-5170 (S/N: 1190)
|
|
AM2
|
SENTX
Site Boundary (West, near DP3)
|
Tisch
TE-5170 (S/N: 1047)
|
|
AM3
|
SENTX Site Boundary (West, near RC15)
|
Tisch
TE-5170 (S/N: 1258)
|
|
AM4
|
SENTX Site Boundary (West, near EPD
building)
|
Tisch
TE-5170 (S/N: 1101)
|
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)
|
96 (62 – 133)
|
260
|
260
|
|
AM2 - SENTX Site Boundary (West, near
DP3)
|
70 (39 – 106)
|
260
|
260
|
|
AM3 - SENTX Site Boundary (West, near
RC15)
|
163 (35 – 224)
|
260
|
260
|
|
AM4 - SENTX Site Boundary (West, near
EPD building)
|
81 (33 – 107)
|
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 SENTX and the TKO Area 137
Fill Bank.
All the 24-hour
TSP results were below the Action and Limit Levels at the monitoring locations
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 4 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.
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 – OP11)
|
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:
7, 16, 21, 29 Mar 2022
Conducted by an independent third
party, ET & IEC:
7, 21 Mar 2022
|
|
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 (Range)
|
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 – 1
|
|
OP8
|
0 – 1
|
|
OP9
|
0
|
|
OP10
|
0
|
|
OP11
|
0 – 1
|
|
|
The potential
odour sources in the reporting period included the slurry truck, excavator as
well as the operation of generator 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.
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. 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
|
7 Mar 2022
|
|
·
Gas
combustion temperature
·
Exhaust
temperature
·
Exhaust
gas velocity (a)
|
Continuously
|
1
– 31 Mar 2022
|
|
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
|
8 Mar 2022
|
|
·
Gas
combustion temperature
·
Exhaust
temperature
·
Exhaust
gas velocity (a)
|
Continuously
|
1
– 31 Mar 2022
|
|
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
|
8 Mar 2022
|
|
·
Exhaust
temperature
·
Exhaust
gas velocity (a)
|
Continuously
|
1
– 31 Mar 2022
|
|
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 will be
reviewed towards the end of the first year of operation 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
|
1.54 gs-1
|
1.58 gs-1
|
|
CO
|
0.04 gs-1
|
0.53 gs-1
|
|
SO2
|
<0.01 gs-1
|
0.07 gs-1
|
|
Benzene
|
<3 x 10-5 gs-1
|
3.01 x 10-2 gs-1
|
|
Vinyl chloride
|
<3 x 10-5 gs-1
|
2.23 x 10-3 gs-1
|
|
Gas combustion
temperature
|
979oC (959oC
– 1,035oC)
|
850oC
(minimum)
|
|
Exhaust gas exit
temperature
|
957K (941K – 1,003K)
|
443K (minimum) (a)
|
|
Exhaust gas velocity
|
9.1 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. The limit level was
not applicable as the stack was not operated under full load condition.
|
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
|
0.056 gs-1
|
2.43 gs-1
|
|
SO2
|
0.007 gs-1
|
0.22 gs-1
|
|
Benzene
|
<1.2 x 10-5 gs-1
|
4.14 x 10-4 gs-1
|
|
Vinyl chloride
|
<1.0 x 10-5 gs-1
|
2.60 x 10-4 gs-1
|
|
Gas combustion
temperature
|
Flare 1: 911oC
(830oC – 990oC)
Flare 2: 854oC
(820oC – 890oC)
|
815oC
(minimum)
|
|
Exhaust gas exit
temperature
|
Flare 1: 1,141K
(1,073K – 1,223K)
Flare 2: 1,077K
(1,033K – 1,123K)
|
923 K (minimum) (a)
|
|
Exhaust gas velocity
|
3.9 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. The limit level was
not applicable as the stack was not operated under full load condition.
|
Table 2.14 Summary of Landfill Gas Generator Stack Emission Monitoring
in the Reporting
Period
|
Parameters
|
Monitoring
Results (Range in Bracket)
|
Limit
Level
|
|
NO2
|
0.022 gs-1
|
1.91 gs-1
|
|
CO
|
0.06 gs-1
|
2.48 gs-1
|
|
SO2
|
<0.001 gs-1
|
0.528 gs-1
|
|
Benzene
|
<2 x 10-6 gs-1
|
2.47 x 10-4 gs-1
|
|
Vinyl chloride
|
<1.9 x 10-6 gs-1
|
1.88 x 10-5 gs-1
|
|
Exhaust gas exit
temperature
|
845K (840K – 850K)
|
723K (minimum) (a)
|
|
Exhaust gas velocity
|
7.8 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. The limit level was
not applicable as the stack was not operated under full load condition.
|
All thermal oxidizer, landfill gas flare and
landfill gas generator stack emission 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 D3.
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 minutes 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
|
2, 8, 14, 21,
28 Mar 2022
|
Sound Level
Meter:
Rion NL-52
(S/N: 00921191)
Acoustic
Calibrator:
Rion NC-74
(S/N: 34246492)
|
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 5
impact noise monitoring events were scheduled during the reporting period. However,
noise monitoring
on 28 March 2022 was cancelled due to adverse weather condition. 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
|
48.6
|
45.9 – 51.3
|
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.
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. Suspension of impact surface water quality monitoring at DP3 was
approved under the Baseline Monitoring Report by EPD on 24 July 2019 until the
actual commencement of construction works affecting DP3 in 2022.
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
|
|
DP4
& DP6
|
|
|
Ammoniacal-nitrogen
|
> 7.1 mg/L
|
|
COD
|
> 30 mg/L
|
|
SS
|
> 20 mg/L
|
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
|
|
DP4
|
Surface water discharge point DP4
|
Monthly
|
21
Mar 2022
|
· 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
|
YSI Professional DSS (S/N: 15H103928)
|
|
DP6
|
Surface water discharge point DP6
|
|
Notes:
(a)
Impact surface
water quality monitoring at DP3 was suspended from the monitoring event on 25
July 2019 until the actual commencement of
construction works affecting DP3 in 2022.
|
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
One
monitoring event for impact surface water quality monitoring was scheduled at
all designated monitoring stations during the reporting period. However,
sampling could not be carried out on 21 March 2022 due to insufficient flow. Details of impact water
quality monitoring event are provided in Annex
F2.
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 daily
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.
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
|
>1,500 m³
|
|
Suspended Solids (SS)
|
> 800 mg/L
|
|
Phosphate
|
> 25 mg/L
|
|
Sulphate
|
> 900 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
|
> 7.5 mg/L
|
|
Cadmium
|
> 1 µg/L
|
|
Chromium
|
> 400 µg/L
|
|
Copper
|
> 1,000 µg/L
|
|
Nickel
|
> 800 µg/L
|
|
Zinc
|
> 800 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 Mar 2022
|
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
|
1 – 23 Mar 2022
|
TOA HM-30P (S/N:
790332)
|
|
|
|
|
|
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
|
57 (42 – 79)
|
> 178
|
|
Meter No. X-2
|
74 (48 – 99)
|
|
|
Average
|
66 (52 – 89)
|
|
|
Pump Station No. 2X (Cell 2X)
|
|
Meter No. X-3
|
78 (66 – 88)
|
> 180
|
|
Meter No. X-4
|
80 (68 – 90)
|
|
|
Average
|
79 (67 – 89)
|
|
|
Pump Station No. 3X (Cell 3X)
|
|
Meter No. X-5
|
80 (53 – 168)
|
> 175
|
|
Meter No. X-6
|
80 (53 – 168)
|
|
|
Average
|
80 (53 – 168)
|
|
Table 2.23 Summary of Effluent Quality Monitoring
Results in the Reporting Period
|
Parameters
|
Average Monitoring Results (Range in
Bracket)
|
Limit Level
|
|
Effluent Discharged from LTP
|
|
Temperature
|
29.4°C (24.9°C – 32.7°C)
|
> 43 °C
|
|
pH Value
|
8.4 (8.3– 8.5)
|
6 – 10
|
|
Volume Discharged
|
1,059m³ (357m³ - 1,498m³)
|
>1,500 m³
|
|
Suspended Solids (SS)
|
23.6mg/L (10.7mg/L – 84.8mg/L)
|
> 800 mg/L
|
|
Phosphate
|
8.0mg/L (4.4mg/L – 10.4mg/L)
|
> 25 mg/L
|
|
Sulphate
|
151mg/L (114mg/L – 199mg/L)
|
> 900 mg/L
|
|
Total Inorganic Nitrogen (a)
|
49.4mg/L (32.8mg/L – 63.3mg/L)
|
> 100 mg/L
|
|
BOD
|
9mg/L (6mg/L – 13mg/L)
|
> 800 mg/L
|
|
COD
|
874mg/L (516mg/L – 1,190mg/L)
|
> 2,000 mg/L
|
|
Oil & Grease
|
<5mg/L (<5mg/L – <5mg/L)
|
> 20 mg/L
|
|
Boron
|
4,824µg/L (3,560µg/L – 5,570µg/L)
|
> 7,000 µg/L
|
|
Iron
|
1.24mg/L (0.86mg/L – 1.63mg/L)
|
> 7.5 mg/L
|
|
Cadmium
|
<1.0µg/L (<1.0µg/L –
<1.0µg/L)
|
> 1 µg/L
|
|
Chromium
|
113µg/L (86µg/L – 143µg/L)
|
> 400 µg/L
|
|
Copper
|
20µg/L (15µg/L – 23µg/L)
|
> 1,000 µg/L
|
|
Nickel
|
107µg/L (80µg/L – 130µg/L)
|
> 800 µg/L
|
|
Zinc
|
75µg/L (46µg/L – 113µg/L)
|
> 800 µg/L
|
|
Note:
(a) Total Inorganic Nitrogen
include Ammoniacal-nitrogen, Nitrite-nitrogen and Nitrate-nitrogen.
|
All the 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.
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 was 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 have 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
|
14, 15 Mar 2022
|
YSI Professional DSS (S/N: 17B102764)
|
|
|
|
|
|
|
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
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
|
0.17
|
5.00
|
4
|
30
|
|
MWX-2
|
0.02
|
5.00
|
<2
|
30
|
|
MWX-3
|
1.45
|
5.00
|
17
|
30
|
|
MWX-4
|
5.91
|
7.63
|
38
|
36
|
|
MWX-5
|
3.8
|
5.00
|
28
|
30
|
|
MWX-6
|
3.95
|
5.00
|
46
|
46
|
|
MWX-7
|
6.18
|
6.55
|
11
|
36
|
|
MWX-8
|
11.8
|
15.85
|
29
|
50
|
|
MWX-9
|
3.29
|
7.30
|
17
|
71
|
|
MWX-10
|
0.02
|
5.00
|
9
|
30
|
|
MWX-11
|
0.06
|
5.00
|
8
|
30
|
|
MWX-12
|
<0.01
|
5.00
|
5
|
30
|
|
MWX-13
|
0.11
|
5.00
|
5
|
30
|
|
MWX-14
|
<0.01
|
5.00
|
3
|
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.
Investigation of the Limit Levels exceedance was conducted and the
investigation report is presented in Annex
F9.
Based
on the investigation conducted for the monitoring event with potential Limit
Levels exceedance with the Contractor and the IEC, the groundwater quality (COD) exceedance at MWX-4 on 15 March 2022 was considered non
Project-related. 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.
2.4
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)
|
|
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 and within the SENTX site 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
|
Ÿ
Methane
Ÿ
Carbon dioxide
Ÿ
Oxygen
Ÿ
Atmospheric
pressure
|
8 Mar 2022
|
GA5000 (S/N: G507306)
|
|
Service voids, utilities and manholes
along the Site boundary and within the SENTX Site (UU1 to UU28)
|
Monthly
|
Ÿ
Methane
Ÿ
Carbon dioxide
Ÿ
Oxygen
|
11 Mar 2022
|
GA5000 (S/N: G507306)
|
|
Permanent gas monitoring system in all
occupied on-site buildings
|
Continuous
|
Ÿ
Methane
(or flammable gas) by permanent gas monitoring system
|
1 – 31 Mar 2022
|
Permanent gas monitoring system
|
Monitoring
Schedule for the Reporting Month
The schedule
for landfill gas monitoring during the reporting period is provided in Annex
C.
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
|
0.0
|
1.0
|
0.1
|
3.2
|
|
LFG2
|
0.0
|
1.0
|
0.4
|
4.3
|
|
LFG3
|
0.0
|
1.0
|
0.0
|
6.3
|
|
LFG4
|
0.0
|
1.0
|
0.0
|
7.0
|
|
LFG5
|
0.0
|
1.0
|
0.0
|
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
|
0.1
|
2.1
|
|
LFG19
|
0.0
|
6.3
|
0.0
|
3.1
|
|
LFG20
|
0.0
|
1.0
|
0.4
|
4.6
|
|
LFG21
|
0.0
|
1.0
|
2.0
|
4.8
|
|
LFG22
|
0.0
|
1.0
|
0.5
|
4.0
|
|
LFG23
|
0.0
|
1.0
|
1.4
|
10.3
|
|
LFG24
|
0.0
|
1.0
|
0.8
|
4.7
|
|
GP1
|
0.0
|
1.0
|
3.1
|
10.6
|
|
GP2 (shallow)
|
0.0
|
1.0
|
0.1
|
11.4
|
|
GP2 (deep)
|
0.0
|
1.0
|
0.1
|
10.4
|
|
GP3 (shallow)
|
0.0
|
1.0
|
3.3
|
6.9
|
|
GP3 (deep)
|
0.0
|
1.0
|
0.1
|
5.6
|
|
GP4 (shallow)
|
0.0
|
1.0
|
0.2
|
11.6
|
|
GP4 (deep)
|
0.0
|
1.0
|
0.1
|
7.7
|
|
GP5 (shallow)
|
0.0
|
1.0
|
0.1
|
10.8
|
|
GP5 (deep)
|
0.0
|
1.0
|
0.1
|
7.5
|
|
GP6
|
0.0
|
1.0
|
0.4
|
8.4
|
|
GP7
|
0.0
|
1.0
|
0.1
|
4.5
|
|
GP12
|
0.0
|
1.0
|
0.6
|
2.3
|
|
GP15
|
0.0
|
1.0
|
0.0
|
2.2
|
|
P7
|
0.0
|
1.0
|
0.0
|
2.5
|
|
P8
|
0.0
|
1.0
|
0.0
|
1.7
|
|
P9
|
0.0
|
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
|
0.0
|
1.0
|
|
UU02
|
0.0
|
1.0
|
|
UU03
|
0.1
|
1.0
|
|
UU04
|
0.1
|
1.0
|
|
UU05
|
0.0
|
1.0
|
|
UU06
|
0.0
|
1.0
|
|
UU07
|
0.3
|
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
|
0.2
|
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 March 2022.
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.
2.5.1
Monitoring
Requirements
According
to the updated
EM&A
Manual of the Project, the monthly landscape and visual audit was conducted on 18 March 2022 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 summarised 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.
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, 5 site inspections were carried out on 3, 10,
17, 24 and 31 March 2022.
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
|
|
3
March 2022
|
·
The
Contractor shall remove the general refuse accumulated at the channel near
sump house 3 and along Western site boundary and dispose of the waste
regularly.
·
The
Contractor shall remove the stagnant water accumulated in the drip tray for
generator at Cell 4X.
|
|
10
March 2022
|
·
The
Contractor shall display a NRMM label on the excavator near RC15.
·
The
Contractor shall remove the general refuse accumulated at the channel near
sump house 2 and 3 and dispose of the waste regularly.
·
The
Contractor shall clean up the oil spillage near sump house 4 and handle the
clean-up materials as chemical waste.
·
The
Contractor shall provide drip tray for the chemical stored at Cell 4X.
|
|
17
March 2022
|
·
The
Contractor shall remove the stagnant water accumulated at the channel near
pump house 3 regularly, and spray larvicides for mosquito control, if
necessary.
·
The
Contractor shall dispose of the waste and remove the stagnant water
accumulated at the refuse skip near DP6 regularly to minimise odour and pest
issues.
|
|
24
March 2022
|
·
The
Contractor shall display a NRMM label on the excavator near EPD building.
·
The
Contractor shall clean up the oil spillage at the excavator near pump house 3
and handle the clean-up materials as chemical waste.
·
The
Contractor shall remove the general refuse and stagnant water accumulated
near Towngas plant and DP6 and dispose of the waste regularly to minimise
odour and pest issues.
|
|
31
March 2022
|
·
The
Contractor shall remove the stagnant water accumulated at the channel near
sump house 3 regularly and spray larvicides for mosquito control, if
necessary.
·
The
Contractor shall remove the general refuse and stagnant water accumulated at
the refuse skip near DP6 and Towngas plant and dispose of the waste regularly
to minimise odour and pest issues.
|
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
|
Ÿ
Reviewed
drainage plan.
|
Ÿ
Addition
of channels.
Ÿ
Expedite
the construction of permanent sediment trap and discharge culverts.
|
|
DP
channels (design & regular silt removal)
|
Ÿ Carried out
regular maintenance and cleaning of channels.
Ÿ DP4 channel:
Area near the channel was paved with concrete and a bund was built.
Ÿ 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.
Ÿ DP6: Pipes
through the gravel piles between different channel sections were covered with
geotextiles to block debris and silt.
|
N.A.
|
|
Stockpiles
& exposed soil
|
Ÿ
Installed silt fencing near surface water channel along DP6
channel.
|
Ÿ
Improve
soil covering.
Ÿ
Compaction
and cover for stockpiles and soil slopes.
|
|
Wetsep
(treatment capacity & number)
|
Ÿ
Reviewed
Wetsep capacity.
Ÿ
Chemicals
dosage of the Wetsep was increased to enhance the efficiency.
|
Ÿ
Install
additional Wetsep.
|
|
Backflow
/ ponding during heavy rainfall
|
Ÿ
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 inert
C&D materials. 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 summarised 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
(c)
(in ‘000m3)
|
Recyclable Materials (d)
(in ‘000kg)
|
Chemical Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
1 – 31 Mar 2022
|
0.039
|
0
|
0
|
0
|
0.010
|
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.
|
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.
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 Level for groundwater (COD) was recorded for water quality impact
monitoring in the reporting period. The
groundwater
(COD) exceedance at MWX-4
on 15 March 2022 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.
3
Future Key Issues
As informed by
the Contractor, the major works for the Project in April 2022 will be:
Ÿ
Excavation and
removal of unsuitable fill materials;
Ÿ
Import materials for
Cell 4X;
Ÿ
Liner works at Cell
4X;
Ÿ
Construction of
perimeter bund along the West side of Cell 4X;
Ÿ
Equipment installation
at pump house 4;
Ÿ
Utilities
installation along the perimeter channel at Western bund of Cell 4X;
Ÿ
Defects
rectification for waste reception area, including weighbridge, vehicle washing
facilities, wheel wash bay and guard house;
Ÿ
Defects
rectification for infrastructure buildings;
Ÿ
Defects
rectification for pavement
works at Part X1 area;
Ÿ
Defects
rectification for surface water channels along the road pavement;
Ÿ
Installation of the
remaining LFG and leachate HDPE pipes at Cell 4X;
Ÿ
Construction
of MSE wall;
Ÿ
Road
pavement along the crest of Western bund of Cell 4X; and
Ÿ
Landscaping work.
3.2
Key Issues for the Coming Month
Potential
environmental impacts arising from the above upcoming construction activities
in the next reporting period of April 2022 are mainly
associated with potential
surface water impact in the rainy season.
The ET will keep track on the construction and operation works to confirm
compliance of environmental requirements and the proper implementation of all
necessary mitigation measures.
The tentative
schedule for environmental monitoring in April 2022 are 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 March 2022 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 and 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, noise 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.
