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 of the Project commenced on 2 January 2019.
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
|
2021
or upon exhaustion of SENT Landfill
|
|
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 Quarterly EM&A Report for the Project which summarises the key
findings of the EM&A programme during the reporting period from 1 July to 30
September 2021 for the construction 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 summarized in Table 1.2 below.
Table 1.2 Contact Information of Key
Personnel
|
Party
|
Position
|
Name
|
Telephone
|
|
Contractor
(Green
Valley Landfill Limited)
|
Project
Manager
|
Gary
Barnicott
|
2706
8827
|
|
Complaint
Hotline
|
|
|
|
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:
July
2021
·
Follow up on civil
provision work detects at Landfill Gas (LFG) Plant, Leachate Treatment Plant
(LTP) and infrastructure area;
·
Construction of
U-channel surface drainage at infrastructure area;
·
Road
pavement for emergency vehicular access (EVA);
·
Permanent equipment
installation for sump houses 1, 2 and 3;
·
Maintenance
and improvement of temporary surface water drainage;
·
Demolition
of the SENT infrastructure buildings;
·
Installation
of weighbridge steel platform;
·
Underground
utilities and pipes installation at waste reception area; and
·
Sewerage
system works at waste
reception area.
August
2021
·
Follow up on civil
provision work detects at LFG Plant, LTP and infrastructure area;
·
Construction of
U-channel surface drainage at infrastructure area;
·
Road
pavement for EVA;
·
Permanent equipment
installation for sump houses 1, 2 and 3;
·
Construction
of MSE wall;
·
Maintenance
and improvement of temporary surface water drainage;
·
Demolition
of the SENT infrastructure buildings;
·
Installation
of weighbridge steel platform; and
·
Underground utilities and pipes
installation at waste reception area.
September
2021
·
Follow up on civil
provision work detects at LFG Plant, LTP and infrastructure area;
·
Construction of
screeding at LTP;
·
Road
pavement for EVA;
·
Permanent equipment
installation for sump houses 1, 2 and 3;
·
Construction
of MSE wall and Cell 4X formation;
·
Maintenance
and improvement of temporary surface water drainage;
·
Demolition
and debris removal of the SENT infrastructure buildings;
·
Installation
of weighbridge steel platform;
·
Underground
utilities and pipes installation at waste reception area; and
·
Sewerage system
works at waste reception area.
The
implementation schedule of the mitigation measures 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 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
|
|
Surface
Water Quality
|
|
Baseline
Monitoring
|
The
results of baseline surface water quality monitoring were reported in Baseline
Monitoring Report and submitted to EPD under EP Condition 3.3
|
|
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
|
|
Construction
Phase Audit
|
On-going
|
|
Site
Environmental Audit
|
|
Regular
Site Inspection
|
On-going
|
|
Complaint
Hotline and Email Channel
|
On-going
|
|
Environmental
Log Book
|
On-going
|
|
Groundwater
Quality
|
|
|
Pre-operation
Baseline Monitoring
|
Commenced
on 24 March 2020 and
completed on 9 March 2021
|
|
Landfill
Gas
|
|
|
Pre-operation
Baseline Monitoring
|
Commenced
on 24 March 2020 and completed on 26 March 2021
|
|
Ambient
VOCs, ammonia and H2S
|
|
Pre-operation
Baseline Monitoring
|
Commenced
on 27 May 2020 and completed on 17 February 2021
|
|
Dust
|
|
Pre-operation Baseline Monitoring
|
Commenced
on 21 May 2021 and completed on 12 June 2021
|
Taking
into account the construction works, impact monitoring of air quality, noise, surface
water quality and waste management were carried out in the reporting period. The
impact monitoring schedule of air quality, noise and surface water quality monitoring
are provided in Annex C.
Groundwater and landfill gas pre-operation baseline monitoring and ambient VOCs,
ammonia and H2S pre-operation baseline monitoring were commenced on
24 March 2020 and 27 May 2020 respectively. Pre-operation baseline dust was
commenced on 21 May 2021.
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
Three
environmental management meetings were held with the Contractor, ER, ET, IEC
and EPD on 22 July, 26 August and 23 September 2021; and
Ÿ
Environmental
toolbox trainings on the following topics were provided by the Contractor to
the workers:
Ÿ
Mosquito
Control on
7 July 2021;
Ÿ
Good
Vehicle Maintenance Practice on 21 July 2021 ;
Ÿ
Dark
Smoke on
12 August 2021;
Ÿ
VOC
and Smog on
19 August 2021;
Ÿ
Indoor
Air Quality on
9 September 2021; and
Ÿ
Persistent Organic
Pollutants on
23 September 2021.
The
status of
statutory environmental compliance with the EP conditions under the EIAO,
submission status under the EP and implementation status of the recommended mitigation
measures are presented in Table
1.4.
Table 1.4 Status of Submissions required
under the EP and Implementation Status of the recommended 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: Chun Wo)
|
Licence No.:
WT00033525-2019
|
Validity from 27
March 2019 to 31 March 2024
|
|
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-RE0154-21
|
Validity from 1
March 2021 to 30 September 2021
|
|
Construction
Noise Permit (Permit Holder: Chun Wo)
|
GW-RE0564-21
|
Validity from 7
June 2021 to 6 December 2021
|
|
Construction
Noise Permit (Permit Holder: REC)
|
GW-RE0255-21
|
Validity from 1
April 2020 to 30 September 2021
|
2
EM&A Results
The
EM&A programme for the Project required environmental monitoring for air
quality, noise and surface water quality as well as environmental site
inspections for air quality, noise, surface water quality, 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
Monitoring
Requirements and Equipment
According to the updated EM&A Manual of the
Project, impact air quality monitoring (dust, in term of Total Suspended
Particulates (TSP)) was
carried out at the two designated monitoring locations (i.e. DM1 and DM2) at a
6-day interval.
It is proposed and agreed by IEC and EPD that the two existing TSP monitoring stations (i.e.
TKO-A1 and TKO-A2a) currently operating by the Civil Engineering and
Development Department (CEDD) can be used to monitor the 24-hour TSP impact
associated with the SENTX construction. The dust monitoring results were
obtained from CEDD on regular basis.
The Action and Limit Levels of the air quality
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
|
|
DM-1
– Site Egress
of TKO Area 137 Fill Bank
|
204
µg m-³
|
260
µg m-³
|
|
DM-2A
–Combined
Reception and Exit Office (CREO) of TKO Area 137 Fill Bank
|
193
µg m-³
|
260
µg m-³
|
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 CEDD 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 air quality monitoring
programme and
monitoring locations are summarised in Table 2.2 and illustrated in Figure 2.1 respectively.
Table 2.2 Dust Monitoring Details
|
Monitoring
Station
|
Location
|
Parameter
|
Frequency
and Duration
|
Monitoring
Dates
|
Equipment
|
|
DM1
|
Site
Egress of TKO Area 137 Fill Bank
|
24-hour
TSP
|
Once
every 6 days during the construction phase of the Project
|
5,
11, 17, 23, 29 July 2021
4,
10, 16, 22, 28 August 2021
3,
9, 15, 21, 27 September 2021
|
HVS
Greasby 105 (S/N: 9795 (ET/EA/003/18))
|
|
DM2
|
Combined
Reception and Exit Office (CREO) of TKO Area 137 Fill Bank
|
HVS Andersen G1051 (S/N: 1176 (ET/EA/003/05))
|
2.1.2
Monitoring Schedule
for the Reporting Period
The
schedule for air quality monitoring during the reporting period is provided in Annex C.
2.1.3
Results and
Observations
The
24-hour TSP monitoring results are summarised in Table 2.3. The detailed
monitoring results and the graphical presentation of the 24-hour TSP monitoring
results at each monitoring location are provided in Annex D1.
Table 2.3 Summary of 24-hour TSP
Monitoring Results in the Reporting Period
|
Month
|
Monitoring Station
|
24-hr TSP
Concentration (µg m-3)
|
Action Level (µg/m3)
|
Limit Level (µg/m3)
|
|
Average
|
Range
|
|
July 2021
|
DM-1
|
105
|
97 – 111
|
204
|
260
|
|
DM-2
|
97
|
89 - 107
|
193
|
260
|
|
August 2021
|
DM-1
|
100
|
89 - 113
|
204
|
260
|
|
DM-2
|
92
|
78 - 105
|
193
|
260
|
|
September 2021
|
DM-1
|
106
|
95 - 120
|
204
|
260
|
|
DM-2
|
99
|
91 - 111
|
193
|
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 existing SENT
landfill and the TKO Area 137 Fill Bank.
All
the 24-hour TSP results measured at the two monitoring stations were below the
Action and Limit Levels in the reporting period. No additional measure is thus
required in accordance with the Event and Action Plan presented in Annex D2.
2.1.4
Meteorological Data
Meteorological
data obtained from the SENTX on-site meteorological monitoring station was used
for the dust monitoring and is shown in Annex D3. 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 construction phase dust monitoring
programme for the Project.
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 construction noise of the Project are provided in Table
2.4 below.
Table 2.4 Action and
Limit Levels for Construction Noise
|
Time Period
|
Action
Level (a)
|
Limit Level
(b)
|
|
07:00 – 19:00
hrs on normal weekdays
|
When one documented
complaint is received from any one of the noise sensitive receivers (NSRs)
or
75 dB(A)
recorded at the monitoring station
|
75 dB(A) at NSRs
|
|
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.
|
Noise
monitoring was performed by ALS Technichem (HK) Pty Ltd (HOKLAS Registration
No. 066) using a sound level meter placed 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 2.5.
Table 2.5 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 the construction period of the Project
|
8,
15, 22, 29 July 2021
5,
12, 19, 26 August 2021
2,
9, 16, 23, 30 September 2021
|
Sound
Level Meter:
Rion
NL-31 (S/N: 00410221)
B&K
2238 (S/N: 2285721)
Acoustic
Calibrator:
Rion
NC-74 (S/N: 34657230) (S/N: 34657231)
|
2.2.2
Monitoring Schedule
for the Reporting Period
The
schedule for noise monitoring during the reporting period is provided in Annex C.
2.2.3
Results and
Observations
A
total of 13 impact noise monitoring events were scheduled during the reporting
period. However, noise monitoring on 5 August, 12 August and 16 September 2021
was cancelled due to adverse weather. The noise monitoring results are summarised
in Table 2.6 and graphically presented in Annex E1.
Table 2.6 Summary of Construction Noise
Monitoring Results in the Reporting Period
|
Month
|
Monitoring Station
|
Measured
Noise Level Leq
(30 min), dB(A)
|
|
Average
|
Range
|
Action
and Limit Level
|
|
July 2021
|
NM1
|
53.1
|
50.5 – 55.5
|
75
|
|
August 2021
|
NM1
|
53.1
|
52.0 – 54.1
|
75
|
|
September 2021
|
NM1
|
53.7
|
51.7 – 55.9
|
75
|
Major
noise sources identified during the noise monitoring included noise from
operations of the existing SENT landfill and the TKO Area 137 Fill Bank,
aircrafts and insects.
No
exceedance of the Action and Limit Levels for construction noise monitoring was
recorded in the reporting period. No further mitigation measure was required
in accordance with the Event and Action Plan presented in Annex E2.
2.3
Surface Water Quality Monitoring
2.3.1
Monitoring
Requirements and Equipment
According
to the updated EM&A Manual of the Project, impact surface water quality
monitoring were carried out at the three designated surface water discharge
points (i.e. DP3, DP4 and DP6) weekly to ensure that the SENTX will not cause
adverse water quality impact. Temporary relocation of surface water discharge
point DP4 to DP4 (Future, temporary) as an interim arrangement due to site
constraints and construction sequence was approved by EPD on 14 May 2019. Impact
surface water quality monitoring was carried out at DP4 (Future, temporary) (i.e.
DP4T) from the monitoring event on 16 May 2019. In
addition, 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 2021.
Dissolved
Oxygen (DO) and pH value were measured in situ whereas the level of
suspended solids (SS) were determined by ALS Technichem (HK) Pty Ltd (HOKLAS
Registration No. 066).
The
Action and Limit Levels of the surface water quality impact monitoring are
provided in Table 2.7.
Table 2.7 Action and
Limit Levels for Surface Water Quality
|
Parameters
|
Action Level
|
Limit Level
|
|
|
DP4 & DP6
|
|
|
DO
|
< 5.80 mg/L
|
< 5.42 mg/L
|
|
SS
|
> 11.7 mg/L
|
> 12.7 mg/L
|
|
pH
|
> 8.39
|
> 8.40
|
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 2.8.
Table 2.8 Impact Surface Water Quality
Monitoring Details
|
Monitoring
Station
|
Location
|
Frequency
|
Monitoring
Dates
|
Parameter
|
Equipment
|
|
DP4
(Future, temporary)
|
Surface water discharge point
DP4
|
Weekly
|
8,
15, 22, 29 July 2021
5,
12, 19, 26 August 2021
2,
9, 16, 23, 30 September 2021
|
•pH
•DO
•SS
|
YSI Professional DSS (S/N:
15H103928)
|
|
DP6
|
Surface water discharge
point DP6
|
|
Notes:
(a)
DP4 was temporary
relocated to DP4 (Future, temporary) (i.e. DP4T) as an interim discharge
point from the monitoring event on 16 May 2019.
(b)
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 2021.
|
2.3.2
Monitoring Schedule
for the Reporting Period
The
schedule for surface water quality monitoring during the reporting period is
provided in Annex C.
2.3.3
Results and
Observations
A
total of 13 monitoring events for impact surface water quality monitoring were scheduled
at all designated monitoring stations during the reporting period. However,
sampling could not be carried out at the monitoring events below due to
insufficient flow:
·
8 July 2021 at all
monitoring locations;
·
15 July 2021 at DP6;
·
22 July 2021 at all
monitoring locations;
·
29 July 2021 at
DP4T;
·
August 2021 at all
monitoring locations; and
·
September 2021 at all
monitoring locations.
Impact water quality monitoring results
and graphical presentations are provided in Annex
F1.
Action
and Limit Level exceedances were recorded for surface water quality impact
monitoring in the reporting period and actions in accordance with the Event and
Action Plan presented in Annex F2 were undertaken. Investigation on the
Action and Limit Levels exceedances were conducted and summarised in Table
2.9 below. Investigation reports of the exceedances are presented in Annex
F3.
Table 2.9 Details of Exceedances
Recorded for Surface Water Quality Monitoring
|
Date
|
Monitoring Location
|
Parameter
|
Type of Exceedance
|
Remarks
|
|
15
July 2021
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Project-related
|
|
29
July 2021
|
DP6
|
SS
|
Limit
Level
|
Project-related
|
|
29
July 2021
|
DP6
|
DO
|
Limit
Level
|
Project-related
|
Based
on the investigation conducted for the monitoring event with potential Action
and Limit Levels exceedances with the Contractor, and the IEC, the exceedances were
found deemed to Project-related activities.
The
Contractor was reminded to implement all relevant mitigation measures for the
construction works and maintain good site practice. The ET will keep track on
the monitoring data and ensure Contractor’s compliance of the environmental
requirements.
2.4.1
Monitoring
Requirements
According to the updated EM&A Manual of the Project, the monthly
landscape and visual audit
was conducted on 26 July, 25 August and 28 September 2021 to monitor the implementation of the
landscape and visual mitigation measures during construction 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.
2.4.2
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 as soon as possible to ensure effective screening
of views of project works from the High Junk Peak Trail. The Contractor has considered
the mitigation measures during the design phase, including the preparation of
the Construction Drawings and Detailed Landscape Design Drawings.
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 for
air quality, noise, surface water quality and waste management under the Project. In the
reporting period, 13 site inspections were carried out on 2, 8, 15, 22 and 29
July, 5, 12, 19 and 26 August, 2, 9, 16, 23 and 30 September 2021.
Key observations during the
site inspections are summarized in Table 2.10.
Table 2.10 Key Observations Identified
during the Site Inspections in this Reporting Period
|
Inspection Date
|
Environmental Observations and Recommendations
|
|
2 July 2021
|
·
The
Contractor shall provide drip tray for the chemical stored near future
weighmaster house.
·
The
Contractor shall remove the stagnant water accumulated in the drip tray near
future maintenance building.
·
The
Contractor shall remove the general refuse accumulated near the container area
near site entrance, skip near vehicle washing facilities and future
maintenance building and dispose of the waste regularly.
·
The
Contractor shall maintain the signage of the chemical waste cabinet near site
entrance to ensure compliance with the COP.
|
|
8 July 2021
|
·
The
Contractor shall enhance watering around the site, especially near demolition
area and main haul road.
·
The
Contractor shall provide drip tray for the chemical stored near future guard
house.
·
The
Contractor shall remove the general refuse accumulated at DP4T and near
future vehicle washing facilities and dispose of the waste regularly.
|
|
15 July 2021
|
·
The
Contractor shall enhance watering around the site, especially near demolition
area.
·
The
Contractor shall provide drip tray for the chemical stored near Paul Y
container area.
·
The
Contractor shall remove the general refuse accumulated near site entrance and
future maintenance building and dispose of the waste regularly.
|
|
22 July 2021
|
·
The
Contractor shall remove the general refuse accumulated near existing LFG
plant and site entrance and dispose of the waste regularly.
|
|
29 July 2021
|
·
The
Contractor shall provide and replace the NRMM labels on the excavators near
demolition area, existing LFG plant, DP4T and on the cherry picker near LTP.
·
The
Contractor shall avoid accumulation of stagnant water at LTP and spray
larvicides for mosquito control, if necessary.
·
The
Contractor shall remove the general refuse accumulated along EVA and future
VWF and dispose of the waste regularly to minimise odour and pest issues.
|
|
2 August 2021
|
·
The
Contractor shall ensure that all surface water at the sediment trap is
treated by the Wetsep before discharge and the Wetsep is functioning properly
at all times.
·
The
Contractor shall remove the stagnant water accumulated near DP4T refuse skip
and LFG4 and spray larvicides for mosquito control, if necessary.
·
The
Contractor shall regulate the water flow from the Wetsep outlet near DP4T to
ensure that all water is treated by the oil interceptor before discharge.
·
The
Contractor shall maintain the signage and lock of the chemical waste cabinet
in accordance with the COP and remove the stagnant water accumulated in the
chemical waste cabinet.
·
The
Contractor shall remove the general refuse accumulated near existing LFG
plant and dispose of the waste regularly.
|
|
12 August 2021
|
·
The
Contractor shall maintain the concrete washing area and remove the concrete
residue regularly, to ensure all wash-water is properly contained.
·
The
Contractor shall remove the stagnant water accumulated in the drip trays near
demolition area, future weighbridge, maintenance building and DP6.
·
The
Contractor shall provide drip trays for the generator near sump house 2 and
chemicals stored near fire services house and DP6.
·
The
Contractor shall provide and replace the NRMM labels on the roller near
demolition area and generators near Cell 2X and future weighbridge,
respectively.
·
The
Contractor shall regulate the water flow from the Wetsep outlet near DP4T to
ensure that all water is treated by the oil interceptor before discharge.
·
The
Contractor shall enhance watering at the demolition area and ensure that the
dusty materials are wet prior to loading and transfer operation.
|
|
19 August 2021
|
·
The
Contractor shall provide drip tray for the chemical stored near EPD building.
·
The
Contractor shall remove the stagnant water accumulated in the chemical waste
cabinet near site entrance and maintain the signage in accordance with the
COP.
|
|
26 August 2021
|
·
The
Contractor shall clean up the oil spillage at the cherry picker near future
weighbridge and handle the clean-up materials as chemical waste.
·
The
Contractor shall remove the general refuse accumulated near existing LFG
plant, resting area near FS building and refuse skip near DP6 and dispose of
the waste regularly to minimise odour and pest issues.
·
The
Contractor shall enhance watering around the site, especially during any
loading, uploading and breaking operations at the demolition area.
·
The
Contractor shall maintain the generator near GVL building to avoid any smoke
emission.
·
The
Contractor shall replace the NRMM label displayed on the roller at demolition
area in accordance with the regulation.
|
|
2 September 2021
|
·
The
Contractor shall ensure that the wheel washing facilities are functioning
properly at all times and all trucks shall pass through the wheel wash before
leaving the site. The Contractor shall remove the deposited silt and grit
accumulated at the wheel washing bay and site exit regularly and ensure that
the wash-water is treated before discharge.
·
The
Contractor shall remove the concrete residue at the concrete truck washing
area near site entrance and DP4T regularly to avoid overflow of wash-water to
the surface water channel.
·
The
Contractor shall replace the faded NRMM label displayed on the generator at
new container area.
·
The
Contractor shall maintain the Wetsep near DP4T and sediment trap to ensure
they are functioning properly at all times and all surface water shall be
treated before discharge.
·
The
Contractor shall provide drip trays for the chemicals stored near site
entrance and at new container area.
·
The
Contractor shall remove the stagnant water accumulated in the drip trays near
southern bund and maintenance building.
·
The
Contractor shall remove the general refuse accumulated near site entrance and
at new container area and dispose of the waste regularly to minimise odour
and pest issues.
|
|
9 September 2021
|
·
The Contractor
shall replace the faded NRMM labels displayed on the generators near GVL
building and DP6.
·
The
Contractor shall remove the deposited silt and grit accumulated at the
surface water channels, especially DP6 channel and at the sedimentation tank
near DP4T regularly to ensure they are functioning properly at all times.
·
The
Contractor shall review the piping at DP4T Wetsep outlet to ensure that all
surface water is treated by the oil interceptor before discharge.
·
The
Contractor shall remove the stagnant water/ chemical accumulated in the drip
tray near maintenance building and treat the clean-up materials as chemical
waste.
·
The
Contractor shall maintain the wheel washing facilities and remove the
deposited silt and grit accumulated at the wheel washing bay regularly to
ensure the facilities are functioning properly and all wash-water is treated
before discharge.
·
The
Contractor shall remove the general refuse accumulated near site entrance and
dispose of the waste regularly to minimise odour and pest issues.
|
|
16 September 2021
|
·
The
Contractor shall display a NRMM label on the generator near sump house 3.
·
The
Contractor shall provide drip trays for the chemicals stored near maintenance
building and at the evacuated container area.
·
The
Contractor shall remove the general refuse accumulated near welfare
facilities work area and dispose of the waste regularly to minimise odour and
pest issues.
|
|
23 September 2021
|
·
The
Contractor shall maintain the Wetseps near DP4T and sediment trap to ensure
they are functioning properly and all surface water is treated before
discharge. The Contractor shall consider providing additional Wetseps to
ensure sufficient treatment capacity and avoid overflow of the Wetsep.
·
The
Contractor shall review the piping at DP4T Wetsep outlet to ensure that all
surface water is treated by the oil interceptor before discharge.
·
The
Contractor shall clean up the oil spillage and stagnant water at the drip
trays near site entrance, sediment trap, new container area and in the
chemical waste cabinet and treat the clean-up materials as chemical waste.
·
The
Contractor shall provide drip trays for the chemical stored at new container
area and near maintenance building.
·
The
Contractor shall provide a designated concrete truck washing area to ensure
that all wash-water is properly contained and treated before discharge.
·
The
Contractor shall maintain the site drainage, especially at the new container
area, and ensure that the untreated water accumulated at the temporary drain
will not be discharged to the surrounding water body.
·
The
Contractor shall label the chemical waste stored at the chemical waste
cabinet at the new container area in accordance with the COP.
|
|
30 September 2021
|
·
The
Contractor shall display the updated CNP at the site entrance for inspection.
·
The
Contractor shall fix the oil interceptor at DP4T Wetsep outlet to ensure that
all surface water is treated by the oil interceptor before discharge.
·
The
Contractor shall clean up the oil spillage near site entrance and at future
maintenance building and treat the clean-up materials as chemical waste.
·
The
Contractor shall provide drip trays for the chemical stored near site
entrance and welfare facilities.
·
The
Contractor shall maintain the site drainage and remove the stagnant water
accumulated at the temporary drain near new container area.
·
The
Contractor shall remove the general refuse accumulated near existing LFG
plant and welfare facilities and dispose of the waste regularly.
·
The
Contractor shall trim the climbing plants around the transplanted tress near
DP6 regularly.
|
|
|
|
The
Contractor has rectified all of the observations identified during
environmental site inspections in the reporting period. Key environmental
deficiencies identified and the corresponding rectification actions are presented
in Table 2.11.
Table 2.11 Summary of Environmental
Deficiencies Identified and Corresponding Additional Control Measures
|
Deficiencies
|
Rectifications Implemented
|
Proposed Additional Control Measures
|
|
Surface
Water
|
|
Intercepting channels & drainage system
|
Ÿ
Reviewed
drainage plan.
|
Ÿ Provision of additional drainage
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 a 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 2.12.
Table 2.12 Quantities of Different Waste Disposed
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)
|
Yard
Waste (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
|
Jul
2021
|
3.526
|
0
|
0
|
0
|
0.220
|
417.120
|
96.000
|
0.110
|
|
Aug
2021
|
1.440
|
0
|
0
|
0
|
0.057
|
505.180
|
0
|
0
|
|
Sep 2021
|
5.392
|
0
|
0
|
0
|
0.397
|
782.600
|
86.100
|
14.800
|
|
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.
|
2.7
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
24-hour TSP monitoring results and construction noise monitoring results complied
with the Action and Limit Levels in the reporting period. One exceedance of
the Limit Level for DO, one exceedance of the Limit Level for pH and one
exceedance of the Limit Level for SS were recorded for surface water quality
impact monitoring in the reporting period. The DO, pH and SS exceedances were
found deemed to Project-related activities.
Cumulative
statistics on exceedances is provided in Annex G.
There
were no complaints, notification of summons or prosecution recorded in the
reporting period.
Statistics
on complaints, notifications of summons and successful prosecutions are summarised
in Annex G.
3
Conclusion and
Recommendation
This Quarterly EM&A Report presents the findings of the
EM&A activities undertaken during the period from 1 July to 30 September
2021 in accordance with the updated EM&A Manual and the requirements of the
Environmental Permit (EP-308/2008/B).
Air quality (24-hour TSP), noise and water quality (DO, pH
and SS) monitoring were carried out in the reporting period. Results for air
quality monitoring (24-hour TSP) complied with the Action and Limit Levels in
the reporting period. No Action and Limit Levels exceedances were recorded for
construction noise monitoring. One
exceedance of the Limit Level for DO, one exceedance of the Limit Level for pH
and one exceedance of the Limit Level for SS were recorded for surface water
quality impact monitoring in the reporting period. The DO, pH and SS
exceedances were found deemed to Project-related activities.
Thirteen
environmental site inspections were carried out during the reporting period. Environmental
deficiencies were identified during the site inspection and the Contractor has
proposed additional control measures to rectify the deficiencies.
There
were no complaints, notification of summons or prosecution recorded in the
reporting period.
It
is noted that most environmental pollution control and mitigation measures were
properly implemented and the construction activities of the Project did not
introduce any adverse impact to the sensitive receivers in the reporting
period. Yet, some environmental deficiencies were identified during the
reporting period and additional control measures have been proposed by the
Contractor to rectify the corresponding deficiencies. The monitoring programme
has been reviewed and was considered as adequate to cater for the nature of
works in progress. Change to the monitoring programme was thus not recommended
at this stage. The monitoring programme will be evaluated as appropriate in
the next reporting period. The ET will keep track on the construction works to
confirm compliance of environmental requirements and the proper implementation
of all necessary mitigation measures.
