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
April 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 and Leachate Treatment Plant (LTP) and
infrastructure area;
·
Automation system
testing at LTP;
·
Testing and
commissioning at LTP;
·
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;
·
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
|
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.
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 8 April 2021; and
Ÿ
Environmental toolbox trainings on Quality Powered Mechanical Equipment
and Handling of Chemical Wastes were provided on 16 April and 21 April 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
|
|
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-RE1047-20
|
Validity
from 9 December 2020 to 7 June 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
|
1, 7, 13, 19, 25 April 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
|
107 (98 - 115)
|
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 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
|
1, 8, 15,
22, 29 April 2021
|
Sound
Level Meter:
B&K
2238 (S/N: 2285722)
(S/N: 2285762)
NL-52 (S/N:
00142581)
Acoustic
Calibrator:
Rion NC-74
(S/N: 34657230)
(S/N: 34657231)
3M AC-300
(S/N: AC300006213)
|
2.2.2
Monitoring Schedule for the
Reporting Month
The
schedule for noise monitoring during the reporting period is provided in Annex C.
2.2.3
Results and Observations
A
total of 5 impact noise monitoring events were scheduled during the reporting
period. However, noise monitoring on 15 April 2021 was cancelled due to
adverse weather. 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
|
53.9
|
51.6 –
56.0
|
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
|
1, 8, 15, 22, 29 April 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 5 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 for
all scheduled events during the reporting period due to insufficient flow.
Details of impact water quality monitoring events are provided in Annex F2.
No
action is thus required to be undertaken in accordance with the Event and
Action Plan presented in Annex F3.
2.4.1
Monitoring Requirements
According
to the updated EM&A Manual of the Project, the monthly landscape
and visual audit was conducted on 16
April 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 1,
8, 14, 22 and 29 April 2021.
Key
observations during the site inspections are summarised in Table 2.9.
Table 2.9 Key Observations Identified during the Site Inspection in this
Reporting Month
|
Inspection
Date
|
Environmental
Observations and Recommendations
|
|
1 April
2021
|
·
The
Contractor shall continue the construction and placement of liner at the
temporary drain along Southern site boundary and schedule to complete the
works by 8 April 2021. The Contractor shall also review and update the
outdated temporary drainage plan asap taking into account the latest site
condition.
·
The
Contractor shall replace the faded NRMM label displayed on the generator near
future GVL building.
·
The
Contractor shall remove the general refuse/ construction materials
accumulated near pump house 3, future bioplant building and at drains near
future GVL building and around future LTP and dispose of the waste regularly.
·
The
Contractor shall clean up the oil spillage at the generator near future GVL
building and handle the clean-up materials as chemical waste.
·
The
Contractor shall cover the cement accumulated at future EPD building to
minimise dust impact.
·
The
Contractor shall avoid accumulation of stagnant water near future maintenance
building and spray larvicides for mosquito control.
|
|
8 April
2021
|
·
The
Contractor shall provide/ replace the oil absorbent sheets at the generator
near future weighbridge and drip tray near future LTP to soak up potential
spill.
·
The
Contractor shall remove the general refuse accumulated near future
maintenance building and construction waste near LFG6 and dispose of the
waste regularly.
·
The
Contractor shall provide drip tray for the chemical stored at future
maintenance building.
|
|
14 April
2021
|
·
The
Contractor shall wash the concrete truck at designated area and avoid
discharge of wash-water to the surrounding water bodies near DP6.
·
The
Contractor shall remove the general refuse/ construction waste accumulated
near future LTP and dispose of the waste in the refuse skips regularly.
·
The
Contractor shall provide drip tray for the chemical stored near future LTP.
|
|
22 April
2021
|
·
The
Contractor shall provide drip trays for the chemicals stored at future
maintenance building and near future LTP.
·
The Contractor
shall remove the general refuse accumulated near pump sump 3 and future
maintenance building and dispose of the waste regularly.
·
The
Contractor shall remove the cement grout remained at the old designated
concrete truck washing area and avoid discharge of wash-water to the
surrounding water bodies near DP4T.
|
|
29 April
2021
|
·
The
Contractor shall provide drip trays for the chemicals stored near existing
LFG plant, future FS tank and future LTP.
·
The
Contractor shall remove the stagnant water accumulated at former DP4T
channel, pump sump 3 and at LTP drains and spray larvicides for mosquito
control, if necessary.
·
The
Contractor shall remove the general refuse/ construction waste accumulated at
drains around future GVL building, future LTP and at DP6 channel to ensure
the drains are functioning properly at all times.
|
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 2.10.
Table 2.10 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 2.11.
Table 2.11 Quantities of Different Waste Generated and Imported Fill
Materials
|
Month/
Year
|
Inert
C&D Materials (a)
(in ‘000m3)
|
Imported
Fill
(in ‘000kg) (b)
|
Inert
Construction Waste Re-used
(in ‘000m3)
|
Non-inert
Construction Waste (c)
(in ‘000m3)
|
Recyclable
Materials (d) (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
1 – 30
Apr 2021
|
0.829
|
0
|
0
|
0
|
0.118
|
0
|
0
|
|
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. Impact
surface water quality monitoring could not be carried out for all the scheduled
events during the reporting period due to insufficient flow.
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 May 2021 will
be:
Ÿ Excavation and removal of unsuitable fill materials;
Ÿ
Import materials for Cell 4X;
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 surface water channels
along the road pavement;
Ÿ
Installation of the remaining gas
and leachate HDPE pipes for Cell 3X and 4X areas;
Ÿ
Road lighting installation;
Ÿ
Demolition of SENT
existing 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
Trial nursery at SENT
and tree felling at Part X3; and
Ÿ
Commissioning for LFG plant and
LTP.
3.2
Key Issues for the Coming Month
Potential
environmental impacts arising from the above upcoming construction activities
in the next reporting period of May 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 May 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 30 April 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. Impact surface water
quality monitoring could not be carried out for all the scheduled events during
the reporting period due to insufficient flow.
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.
