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 2019 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
|
|
2706
8682
|
|
Environmental
Team (ET) (ERM-Hong Kong, Limited)
|
ET
Leader
|
Frank
Wan
|
2271
3152
|
|
Independent Environmental Checker (IEC)
(Meinhardt Infrastructure and Environment Limited)
|
IEC
|
Fredrick
Leong
|
2859 1739
|
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 2019
·
Rebar fixing,
concreting and formwork erection for the plinth and control buildings at
Landfill Gas Plant area;
·
Shotcreting of
permanent works at buttress wall area;
·
Excavating, removing
and replacing unsuitable fill materials;
·
Rebar fixing,
formwork and concreting to the sediment trap, drop inlet shaft, MHX1, manhole
and outlet box culverts;
·
Rebar fixing,
formwork and concreting to the Leachate Treatment Plant (LTP) area and
buildings;
·
Rebar, formwork and
concreting to the substructure of infrastructure buildings (EPD building, GVL
building and laboratory);
·
Construction of
perimeter bund for Cell 1X and 2X;
·
Installing
groundwater pipe works along Eastern perimeter bund; and
·
CLP trench works at
Area X2.
August 2019
·
Rebar fixing,
concreting and formwork erection for the plinth and control buildings at
Landfill Gas Plant area;
·
Excavating, removing
and replacing unsuitable fill materials;
·
Rebar fixing,
formwork and concreting to the sediment trap, drop inlet shaft, MHX1, manhole
and outlet box culverts;
·
Rebar fixing,
formwork and concreting to the LTP area and buildings;
·
Rebar, formwork and
concreting to the substructure of infrastructure buildings (EPD building, GVL
building and laboratory);
·
Construction of
perimeter bund for Cell 1X and 2X;
·
Maintenance
and improvement of the temporary surface water drainage;
·
Preparation works of
buttress wall (shotcreting and mass);
·
Installing
groundwater pipe works along eastern perimeter bund;
·
CLP trench works at
Area X2; and
·
Construction of X12
channel.
September 2019
·
Rebar fixing, concreting
and formwork erection for the plinth and control buildings at Landfill Gas
Plant area;
·
Excavating, removing
and replacing unsuitable fill materials;
·
Sediment trap
remedial works;
·
Construction of drop
inlet shaft, MHX1 manhole and outlet box culvert;
·
Rebar fixing,
formwork and concreting to the LTP area and EPD, GVL and laboratory buildings;
·
Rebar, formwork and
concreting to the substructure of infrastructure buildings (EPD building, GVL
building and laboratory);
·
Installation of
ammonia stripping plant, equalization tank 2 and sequencing batch reactor tank
1 at LTP area;
·
Construction of
perimeter bund for Cell 1X and 2X;
·
Maintenance
and improvement of the temporary surface water drainage;
·
Preparation works of
buttress wall (shotcreting and mass);
·
Installing
groundwater pipe works along eastern perimeter bund;
·
CLP trench works at
Area X2; and
·
Construction of X12
channel.
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
|
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 monitoring schedule
of air quality, noise and surface water quality 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
Three
environmental management meetings were held with the Contractor, ER, ET, IEC
and EPD on 11 July, 21 August and 18 September 2019; and
Ÿ
Environmental
toolbox trainings on the following topics were provided by the Contractor to
the workers:
Ÿ
Construction
Dust on 12 July 2019;
Ÿ
Air
Pollution Control (Non-road Mobile Machinery) (Emission) Regulation on 19 July
2019;
Ÿ
VOC
and Smog on 12 August 2019;
Ÿ
Illegal
Dumping on 26 August 2019;
Ÿ
Mosquito
Nuisance on 11 September 2019; and
Ÿ
Persistent
Organic Pollutants on 23 September 2019.
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
|
|
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
|
|
Construction
Noise Permit (Permit Holder: Chun Wo)
|
GW-RE0404-19
|
Validity from
28 May 2019 to 22 November 2019 (cancelled with effect from 9 September 2019
at 07:00 hrs)
|
|
GW-RE0695-19
|
Validity from 9
September 2019 to 3 March 2020
|
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
|
3,
9, 15, 21, 27 July 2019
2,
8, 14, 20, 26 August 2019
2,
8, 14, 20, 26 August 2019
|
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 2019
|
DM-1
|
88
|
74 - 112
|
204
|
260
|
|
DM-2
|
93
|
82 – 111
|
193
|
260
|
|
August 2019
|
DM-1
|
71
|
55 - 85
|
204
|
260
|
|
DM-2
|
72
|
49 - 95
|
193
|
260
|
|
September 2019
|
DM-1
|
103
|
67 - 134
|
204
|
260
|
|
DM-2
|
108
|
79 - 146
|
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
on-site meteorological monitoring station at the existing SENT landfill (see Figure 2.1) were used for
the dust monitoring and are shown in Annex D3. The meteorological station will be moved to
a new location at SENTX infrastructure area as per the updated EM&A Manual
after the construction of the new infrastructure area is completed. For the
purpose of this EM&A programme, it is considered that meteorological data
obtained at the existing SENT landfill meteorological monitoring station are
representative of the Project area and could be used for the interpretation of
the construction phase dust monitoring results.
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
|
4,
12, 18, 25 July 2019
1,
8, 15, 22, 29 August 2019
5,
12, 19, 26 September 2019
|
Sound
Level Meter: B&K 2250 (S/N: 3012330)
Sound
Level Meter: B&K 2238 (S/N: 2285762)
Acoustic
Calibrator: Rion NC-75 (S/N: 34680623)
|
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, monitoring was not
conducted on 1 and 29 August 2019 due to adverse weather condition. 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 2019
|
NM1
|
54.0
|
52.0 – 56.1
|
75
|
|
August 2019
|
NM1
|
55.3
|
51.8 – 59.7
|
75
|
|
September 2019
|
NM1
|
52.6
|
51.0
– 54.8
|
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
|
|
|
DP3
|
DP4 & DP6
|
DP3
|
DP4 & DP6
|
|
DO
|
< 5.13 mg/L
|
< 5.80 mg/L
|
< 4.35 mg/L
|
< 5.42 mg/L
|
|
SS
|
> 209.3 mg/L
|
> 11.7 mg/L
|
> 217.0 mg/L
|
> 12.7 mg/L
|
|
pH
|
> 8.88
|
> 8.39
|
> 9.28
|
> 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
|
|
DP3
|
Surface
water discharge point DP3
|
Weekly
|
4,
12, 18, 25 July 2019
1,
8, 15, 22, 29 August 2019
5,
12, 19, 26 September 2019
|
•pH
•DO
•SS
|
YSI
Professional Plus (S/N: HK1923829)
YSI
Professional Plus (S/N: JC024046)
YSI
Professional DSS (S/N: 15H102620)
|
|
DP4, DP4 (Future,
temporary)
|
Surface water discharge
point DP4
|
|
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 on 4 July 2019 at DP6, on 12 July 2019 at DP4 (Future,
temporary) and DP6, on 18 July 2019 at DP6, on 8 and 15 August 2019 at DP4
(Future, temporary), on 5 and 26 September 2019 at DP6 and 19 September 2019 at
all monitoring locations due to insufficient flow. Monitoring was not
conducted on 1 and 29 August 2019 due to adverse weather condition. Impact water quality monitoring results and graphical
presentations are provided in Annex
F1.
Exceedances of the Action and Limit
Levels were recorded for impact surface water quality monitoring in the
reporting period and actions in accordance with the Event and Action Plan
presented in Annex F2 were undertaken. Investigations 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 of Action
and Limit Levels for the Impact Surface Water Quality Monitoring
|
Date
|
Monitoring
Location
|
Parameter
|
Type
of Exceedance
|
Remarks
|
|
4
July 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
|
4
July 2019
|
DP4
(Future, temporary)
|
SS
|
Limit
Level
|
Non
Project-related
|
|
18
July 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
|
18
July 2019
|
DP4
(Future, temporary)
|
SS
|
Limit
Level
|
Non
Project-related
|
|
25
July 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
|
25
July 2019
|
DP4
(Future, temporary)
|
SS
|
Limit
Level
|
Project-related
|
|
8
August 2019
|
DP6
|
SS
|
Limit
Level
|
Non
Project-related
|
|
22
August 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
|
22
August 2019
|
DP4
(Future, temporary)
|
SS
|
Limit
Level
|
Non
Project-related
|
|
5 September 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
5 September 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
12 September 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
Based on the investigation conducted for
each of the monitoring event with potential Action and Limit Levels exceedances
with the Contractor, the ER and the IEC, there is no evidence showing the
exceedances were related to the Project, except the exceedance of SS at DP4
(Future, temporary) on 25 July 2019 which was 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 22 July, 21 August and 27 September 2019
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
identify the topsoil to be generated from the construction works and plan for the
storage and re-use of the topsoil as far as practical. 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 5,
11, 18 and 25 July, 1, 8, 15, 21 and 29 August and 5, 12, 18 and 26 September 2019.
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
|
|
5 July 2019
|
·
The
Contractor shall remove the deposited silt and grit and repair the bund at
the temporary drain along the western perimeter bund and near future EPD
building to ensure it is functioning at all times.
·
The
Contractor shall fix the geo-textile at the pipes of DP6 channel.
·
The
Contractor shall improve the concrete berm to avoid leakage and overflow of
muddy water to DP6 channel.
·
The
Contractor shall remove stagnant water in the drip trays at Cell X1 and near
the future GVL building.
·
The
Contractor shall avoid the accumulation of water in the rodding eye of the
concrete block near the Wetsep at Cell X1.
·
The
Contractor shall remove general refuse and maintain housekeeping at the
future LTP and near the future GVL building.
·
The
Contractor shall dispose the waste in the waste skip regularly at Cell X1.
|
|
11 July 2019
|
·
The
Contractor shall provide silt fencing/ berm along the DP6 channel to minimize
SS runoff to the channel.
·
The
Contractor shall maintain site drainage and avoid accumulation of stagnant
water at the temporary drain near Eastern site boundary and at sediment trap.
|
|
18 July 2019
|
·
The
Contractor shall fix the crack at DP4T channel to avoid direct discharge of
site water to the channel.
·
The
Contractor shall provide drip tray for the chemical placed near DP4T channel.
·
The
Contractor shall display chemical labels to the chemicals placed near LTP and
southern site boundary.
|
|
25 July 2019
|
·
The
Contractor shall maintain DP4T channel to minimise SS run-off.
·
The
Contractor shall clean up the oil spillage near the wheel-washing facilities
and handle the clean-up materials as chemical waste.
·
The
Contractor shall repair the temporary drainage along western site boundary to
avoid direct discharge of site water outside site boundary.
·
The
Contractor shall label the chemical waste in the chemical waste cabinet in
accordance with the Code of Practice on the Packaging, Handling and
Storage of Chemical Waste. Also, the Contractor shall avoid accumulation
of oily liquid in the chemical waste cabinet and dispose the clean-up
material as chemical waste.
·
The
Contractor shall dispose the general refuse in the refuse skip near the
wheel-washing facilities, southern western boundary and LTP.
·
The
Contractor shall clear the refuse skip regularly to reduce odour, pest and
littler impacts.
·
The
Contractor shall also dispose the chemical waste in refuse skip and empty
chemical containers in the site in the chemical waste cabinet.
|
|
1 August 2019
|
·
The
Contractor shall display the Environmental Permit and other relevant licenses
at all the entrances or at a convenient location for public information at
all times.
·
The
Contractor shall fix the geotextile at the pipes along the DP6 channel.
·
The
Contractor shall clean up the oil spillage around the site (e.g. near the
wheel-washing area and the sediment trap) and handle the clean-ups as
chemical waste.
·
The
Contractor shall ensure plugs for trip trays around the site are installed.
The Contractor shall also avoid the accumulation of liquid in the drip tray,
any oily liquid shall be cleaned up and the clean-ups shall be disposed as
chemical wastes.
·
The
Contractor shall repair the temporary drainage along the southern boundary
and at the south-western boundary corner.
·
The
Contractor shall review and enhance the drainage system of the whole site to
avoid the accumulation of water and overflowing of site water outside the
site boundary.
·
The
Contractor shall dispose the general waste in the general refuse skip near
wheel-washing areas and sediment trap. The Contractor shall also maintain
the housekeeping of the whole area.
|
|
8 August 2019
|
·
The
Contractor shall enhance watering to the site, especially to the main haul
roads and working areas of loading and unloading dusty materials (e.g.
increase the frequency of watering or install more sprinklers) to minimize
fugitive dust emission.
·
The
Contractor shall implement dust control measures when conducting activities
related to dusty materials (i.e. handling of sawdust) near future EPD
building..
·
The
Contractor shall maintain the drainage at DP6 channel and silt removal
facilities to ensure all site water is treated prior to discharge.
·
The
Contractor shall remove the wash-water and silt at the wheel washing
facilities more frequently to avoid overflow.
·
The
Contractor shall clear the general refuse near southern site boundary and
dispose the metallic waste at southern site boundary at their respective
skip.
|
|
15 August 2019
|
·
The
Contractor shall clean up the oil spillage around the wheel-washing area and
handle the clean-ups as chemical waste.
·
The
Contractor shall install plugs for drip trays around the site. The
Contractor shall also avoid the accumulation of liquid in the drip tray next
to DP6, any oily liquid shall be cleaned up as the clean-ups shall be
discarded as chemical waste.
·
The
Contractor shall enhance the drainage system around the sediment trap and
near the southern boundary to avoid the accumulation of stagnated water. The
Contractor shall also maintain the pipes near the southern boundary to avoid
leakage and spillage of water around the site. The Contractor shall also
ensure the pipe reached the drainage network.
·
The
Contractor shall dispose the metal waste around the site in its respective
skips and general waste around the site (including sediment trap, southern
boundary, at the south-western boundary corner and at the future EPD office)
in the general refuse skips.
·
The
Contractor shall dispose empty chemical waste containers around the site as
chemical waste in accordance with the Code of Practice on the Packaging,
Handling and Storage of Chemical Waste.
|
|
21 August 2019
|
·
The
Contractor shall clean up the oil spillage near the sediment trap and handle
the clean-up materials as chemical waste.
·
The
Contractor shall dispose empty chemical containers around the site as
chemical waste in accordance with the Code of Practice.
·
The
Contractor shall avoid accumulation of stagnant water at the future LTP and
spray larvicides for mosquito control.
·
The
Contractor shall store the general refuse in refuse skip near future LFG
Plant and dispose of the waste accumulated on site regularly.
|
|
29 August 2019
|
·
The
Contractor shall clear the deposited silt around the pump near the vehicle
washing facilities to ensure it is functioning properly.
·
The
Contractor shall maintain the concrete bund and remove the deposited silt and
grit regularly at the temporary drainage along Western perimeter bund to
prevent overflow of site water outside site boundary.
·
The
Contractor shall clean up the oil spillage near the vehicle washing
facilities and handle the clean up materials as chemical waste.
·
The Contractor
shall avoid accumulation of stagnant water in the drip trays near future LFG
plant and ensure all chemicals are contained inside the drip trays.
·
The
Contractor shall dispose the chemical waste in the refuse skip near DP4T
channel in the chemical waste cabinet and avoid accumulation of stagnant
water in the refuse skip.
|
|
5 September 2019
|
·
The
Contractor shall display a NRMM label to the roller near the new haul road.
·
The
Contractor shall remove the deposited silt and grit and maintain the concrete
bund at the temporary drainage along the Western perimeter bund to prevent
overflow of site water outside the site boundary.
·
The
Contractor shall maintain the concrete partition and enhance the efficiency
of the silt removal facilities at DP6 to ensure all water is treated before
discharge.
·
The
Contractor shall clean up the oil spillage near the sediment trap and handle
the clean up materials as chemical waste.
·
The
Contractor shall maintain the drainage at the upstream of DP4T (near buttress
wall) to avoid direct discharge of muddy water to the channel.
·
The Contractor
shall provide drip trays for all chemicals on site and ensure all chemicals
are contained inside the drip trays.
·
The
Contractor shall clear the general refuse in the refuse skips near DP4T
channel regularly to reduce odour and pest impacts and avoid accumulation of
stagnant water in the refuse skips.
|
|
12 September 2019
|
·
The
Contractor shall enhance watering to the site, especially to the working
areas to minimize fugitive dust emission. The Contractor shall also increase
watering frequency of water trucks to the haul road prior to the complete
installation and operation of sprinklers along the haul road.
·
The
Contractor shall implement dust control measure when conducting activities
related to dusty materials (i.e. handling of sawdust) near future LFG Plant.
·
The
Contractor shall remove the deposited silt and grit (especially around the
excavator) and maintain the concrete bund at the temporary drainage along the
Western perimeter bund to prevent overflow of site water outside the site
boundary.
|
|
18 September 2019
|
·
The
Contractor shall replace the faded NRMM label on the generator near DP6 and
ensure all NRMM labels on the regulated machines on site are coloured and
clearly visible.
|
|
26 September 2019
|
·
The
Contractor shall display chemical labels to the chemicals placed near
sediment trap, future EPD Building and DP6 channel.
·
The
Contractor shall replace the NRMM label on the generator near future GVL
Building to ensure the label is coloured and clearly visible in accordance
with the APCO.
·
The Contractor
shall continue to remove the deposited silt and grit at the temporary channel
along the Western perimeter bund to prevent overflow of site water outside
the site boundary.
|
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 Proposed
by the Contractor
|
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 non-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)
|
Inert
Construction Waste Re-used
(in ‘000m3)
|
Non-inert
Construction Waste (b)
(in ‘000m3)
|
Recyclable
Materials (c) (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
July
19
|
0.028
|
0
|
6889.13
|
0
|
0.049
|
0
|
0
|
|
August
19
|
0.014
|
0
|
17110.67
|
0
|
0.051
|
0
|
0
|
|
September
19
|
0.007
|
0
|
12560.05
|
0
|
0.048
|
0
|
0.09
|
|
Notes:
(a)
Inert
construction wastes include hard rock and large broken concrete, and
materials disposed as public fill. Density assumption: 1.6 (t/m3)
for public fill
(b)
Non-inert
construction wastes include general refuse disposed at landfill. Density
assumption: 0.9 (t/m3) for general refuse.
(c)
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. 6 exceedances of the Limit Level for pH and 6 exceedances
of the Limit Level of SS were recorded for surface water quality impact
monitoring in the reporting period. The exceedances were investigated and considered
not Project-related, except the SS exceedance at DP4 (Future, temporary) on 25
July 2019 which was found deemed to Project-related activities.
Cumulative statistics on exceedances is
provided in Annex G1.
There were no notification of summons or
prosecution recorded in the reporting period.
One environmental complaint related to
dust nuisance was received during the reporting period. Investigation on the
environmental complaint was conducted in accordance with the complaint handling
process as stated in the Updated EM&A Manual. The implementation of the
relevant mitigation measures recommended in the updated EM&A Manual by the
Contractor might suggest that the dust nuisance was deemed to activities that
are not related to the Project. Investigation report of the complaint is
presented in Annex G2.
Statistics on complaints, notifications
of summons and successful prosecutions are summarised in Annex G1.
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 2019 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. 6 exceedances of the Limit
Level for pH and 6 exceedances of the Limit Level for Suspended Solids (SS)
were recorded for surface water quality impact monitoring in the reporting
period. The exceedances were considered not Project-related upon further
investigations, except the SS exceedance at DP4 (Future, temporary) on 25 July
2019 which was 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 notification of summons or
prosecution recorded in the reporting period. One environmental complaint
related to dust nuisance was received during the reporting period.
Investigation on the environmental complaint was conducted in accordance with
the complaint handling process as stated in the Updated EM&A Manual.
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.
