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 Monthly EM&A Report for
the Project which summarises the key findings of the EM&A programme during the
reporting period from 1 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
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
|
Gary
Barnicott
|
2706
8827
|
|
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:
·
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 Leachate Treatment Plant (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 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 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
One
environmental management meeting was held with the Contractor, ER, ET, IEC and EPD
on 18 September 2019; and
Ÿ
Environmental
toolbox trainings on Mosquito
Nuisance and Persistent Organic Pollutants were provided on 11
September and 23 September 2019 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: 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.
As there
are two existing TSP monitoring
stations (i.e. TKO-A1 and TKO-A2a) currently operating by the Civil Engineering
and Development Department (CEDD) to monitor the 24-hour TSP levels at the proposed dust
monitoring stations for the SENTX, it is considered that the CEDD monitoring
data can represent the dust condition of the SENTX during the construction
phase.
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. 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
|
|
DM1
|
Site Egress of TKO Area
137 Fill Bank
|
24-hour TSP
|
Once every 6 days during
the construction phase of the Project
|
7, 13, 19, 25 September 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 Month
The schedule for air quality monitoring during
the reporting period is provided in Annex C.
2.1.3
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)
|
|
DM-1 – Site Egress of TKO Area 137
Fill Bank
|
103 (67 - 134)
|
204
|
260
|
|
DM-2A –Combined Reception and Exit
Office (CREO) of TKO Area 137 Fill Bank
|
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 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.
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 D4. The meteorological station will be relocated
to a new position for SENTX as per the updated EM&A Manual after the new
infrastructure area at the SENTX is constructed. It is considered that meteorological
data obtained at the existing the on-site meteorological monitoring station are
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 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 2.5.
Copies of the calibration certificates for the equipment are presented in Annex E1.
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
|
5,
12, 19, 26 September 2019
|
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 Month
The schedule for noise monitoring during
the reporting period is provided in Annex C.
2.2.3
Results and
Observations
A total of 4 impact noise monitoring
events were scheduled during the reporting period. Results for noise
monitoring are summarised in Table 2.6. The monitoring results and the
graphical presentation of the data are provided in Annex E2.
Table 2.6 Summary of Construction Noise
Monitoring Results in the Reporting Period
|
Monitoring Station
|
Measured
Noise Level Leq
(30 min), dB(A)
|
|
Average
|
Range
|
Action
and Limit Level
|
|
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 Action and Limit Levels exceedance
was recorded for construction 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
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. 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. Copies of
the calibration certificates for the equipment are presented in Annex F1.
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
|
5, 12, 19, 26 September 2019
|
•pH
•DO
•SS
|
YSI Professional DSS (S/N:
15H102620)
|
|
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 Month
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 4
monitoring events for impact surface water quality monitoring were scheduled at
all designated monitoring stations during the reporting period. However,
sampling was not carried out on 5 September 2019 at DP6, 19 September 2019 and 26
September 2019 at DP6 due to insufficient flow. Impact water quality
monitoring results and graphical presentations are provided in Annex
F2.
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
F3 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 F4.
Table 2.9 Details of Exceedances
Recorded for Surface Water Quality Monitoring
|
Date
|
Monitoring Location
|
Parameter
|
Type of Exceedance
|
Remarks
|
|
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, and the IEC, the pH and SS exceedances at DP4 (Future,
temporary) on 5 September 2019 and pH exceedance at DP4 (Future, temporary) on 12
September 2019 were considered not Project-related upon further investigation.
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 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 where practical. The Contractor shall
consider 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, 4 site inspections were carried out on 5,
12, 18 and 26 September 2019.
Key observations during the site inspections are summarised
in Table 2.10.
Table 2.10 Key Observations Identified
during the Site Inspection in this Reporting Month
|
Inspection Date
|
Environmental Observations and Recommendations
|
|
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 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 non-inert construction waste.
Reference has been made to the waste flow table prepared by the Contractor.
The quantities of different types of wastes and imported fill materials are
summarised in Table 2.12.
Table 2.12 Quantities of Different Waste
Generated 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
|
|
1 – 30
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 (kg/L) for public
fill.
(b) Non-inert
construction wastes include general refuse disposed at landfill. Density
assumption: 0.9 (kg/L) 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. 2 exceedances of the Limit Level for pH and 1
exceedance of the Limit Level for SS were recorded for surface water quality
impact monitoring in the reporting period. The pH and SS exceedances at DP4
(Future, temporary) on 5 September 2019 and pH exceedance at DP4 (Future,
temporary) on 12 September 2019 were considered not Project-related upon
further investigation.
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, successful prosecutions are summarised in Annex G.
3
Future Key Issues
As informed by the Contractor, the major
works for the Project in October 2019 will be:
Ÿ
Site clearance,
preparation and formation of Area X1 and X2;
Ÿ Excavation and removal of unsuitable
fill materials;
Ÿ Remaining site formation works at Area
X1;
Ÿ Filling of perimeter bund for Cell 2X;
Ÿ Construction of drop inlet shaft;
Ÿ Construction of buttress wall;
Ÿ Construction of perimeter wall and
plinths at LTP area and substructure at bioplant;
Ÿ Installation of ammonia stripping plant,
equalization and sequencing batch reactor tanks and other equipment at LTP area;
Ÿ Construction of CLP trench;
Ÿ Excavation and construction of discharge
box culvert;
Ÿ Construction of substructure and
superstructure of new infrastructure building;
Ÿ Construction of plinths and superstructure
of Landfill Gas Plant area;
Ÿ Construction of X12 channel;
Ÿ Construction of groundwater pipe from
east to south in Cell 1X and 2X perimeter bund; and
Ÿ Construction of substructure and
superstructure at maintenance building.
3.2
Key Issues for the Coming Month
Potential environmental impacts arising
from the above upcoming construction activities in the next reporting period of
October 2019 are mainly associated with dust emission
from the exposed area and loading and uploading operation of dusty materials. The
ET will keep track on the construction works to confirm compliance of
environmental requirements and the proper implementation of all necessary
mitigation measures.
The tentative schedules for
environmental monitoring in October
2019
are provided in Annex H.
4
Conclusion and
Recommendation
This EM&A Report presents the
findings of the EM&A activities undertaken during the period from 1 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. 2 exceedances of the Limit
Level for pH and 1 exceedance of the Limit Level for SS were recorded for
surface water quality impact monitoring in the reporting period. The pH and SS
exceedances at DP4 (Future, temporary) on 5 September 2019 and pH exceedance at
DP4 (Future, temporary) on 12 September 2019 were considered not
Project-related upon further investigation.
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 works to confirm compliance of environmental requirements and the
proper implementation of all necessary mitigation measures.
