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 31 July
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 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
|
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:
·
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.
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
|
|
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
One
environmental management meeting was held with the Contractor, ER, ET, IEC and EPD
on 22 July 2021; and
Ÿ
Environmental
toolbox trainings on
Mosquito Control and Good Vehicle Maintenance
Practice were
provided on 7 July and 21 July 2021 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
|
|
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.
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
|
5, 11, 17, 23, 29 July
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 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
|
105 (97 - 111)
|
204
|
260
|
|
DM-2A –Combined Reception and Exit
Office (CREO) of TKO Area 137 Fill Bank
|
97 (89 – 107)
|
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 SENTX on-site meteorological monitoring station was used
for the dust monitoring and is shown in Annex D4. It is considered that meteorological data
obtained at the on-site meteorological monitoring station is representative of
the Project area and could be used for the 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
|
8,
15, 22, 29 July 2021
|
Sound
Level Meter:
Rion
NL-31 (S/N: 00410221)
Acoustic
Calibrator:
Rion
NC-74 (S/N: 34657230)
|
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
|
53.1
|
50.5
– 55.5
|
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
|
8, 15, 22, 29 July 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 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 could not
be carried out on 8, 22 and 29 July 2021 at DP4T and on 8, 15 and 22 July 2021
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 of the
Action and Limit Levels exceedances are conducted and summarized 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
|
|
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 events 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 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 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, 5 site inspections were carried out on 2,
8, 15, 22 and 29 July 2021.
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
|
|
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.
|
The
Contractor has rectified all observations identified during environmental site
inspections in the reporting period. Key environmental deficiencies identified
and the corresponding rectification actions are presented in Table 2.11.
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 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
Generated and Imported Fill Materials
|
Month/
Year
|
Inert
C&D Materials (a) (in ‘000m3)
|
Imported
Fill
(in ‘000kg) (b)
|
Inert
Construction Waste Re-used
(in ‘000m3)
|
Non-inert
Construction Waste (c)
(in ‘000m3)
|
Recyclable
Materials (d) (in ‘000kg)
|
Yard
Waste (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
|
1 –
31 July 2021
|
3.526
|
0
|
0
|
0
|
0.220
|
417.120
|
96.000
|
0.110
|
|
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, successful prosecutions are summarised
in Annex G.
3
Future Key Issues
As
informed by the Contractor, the major works for the Project in August 2021 will
be:
Ÿ Excavation and removal of unsuitable
fill materials;
Ÿ Import materials for Cell 4X;
Ÿ Construction of Cell 4X formation;
Ÿ Installation of groundwater pipes for
Cell 4X;
Ÿ Construction of welfare area;
Ÿ Screeding works at LTP;
Ÿ Remaining building service and
fitting-out works at maintenance
building;
Ÿ Pavement works at Part X1 area;
Ÿ Construction of the remaining surface water
channels along the road pavement;
Ÿ Installation of the remaining LFG and
leachate HDPE pipes at Cell 3X and 4X;
Ÿ Equipment installation for sump houses
1, 2 and 3;
Ÿ Road lighting installation;
Ÿ Demolition of SENT infrastructure
buildings;
Ÿ Construction of mechanically
stabilised earth (MSE) wall;
Ÿ Construction of waste reception area,
including weighbridge, vehicle washing facilities, wheel wash bay and guard
house;
Ÿ Weighbridge and canopy
installation;
Ÿ Trial nursery at SENT and tree
felling at Part X3;
Ÿ Landscape work; and
Ÿ Liner Installation work.
3.2
Key Issues for the Coming Month
Potential
environmental impacts arising from the above upcoming construction activities
in the next reporting period of August 2021 are mainly
associated with the potential surface water impact in the rainy season. 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 August 2021 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 31 July 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.
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.
