1
Introduction
The SENT Landfill
Extension (SENTX) forms an integral part in the Strategic Plan in maintaining
the continuity of landfill capacity in the Hong Kong for the cost-effective and
environmentally satisfactory disposal of waste. The Environmental Impact Assessment
(EIA) Report and the associated Environmental Monitoring and Audit
(EM&A) Manual for the construction, operation, restoration and
aftercare of the SENTX (hereafter referred to as “the Project”) have been
approved under the Environmental Impact Assessment Ordinance (EIAO) in
May 2008 (Register No.: AEIAR-117/2008) (hereafter referred to as the approved EIA Report) and an Environmental Permit
(EP-308/2008) (EP) was granted by the Director of Environmental Protection
(DEP) on 5 August 2008.
Since then,
applications for Variation of an Environmental Permit (No. VEP-531/2017) were
submitted to EPD and the Variation of Environmental Permits (EP-308/2008/A and
EP-308/2008/B) were granted on 6 January 2012 and 20 January 2017,
respectively, as the Hong Kong SAR Government has decided to reduce the scale
of the design scheme of SENTX assessed in the approved EIA Report and SENTX
will only receive construction waste. In May 2018, a Further Environmental
Permit (FEP) (FEP-01/308/2008/B) was granted to the SENTX’s contractor, Green
Valley Landfill, Limited (GVL).
ERM-Hong Kong, Limited
(ERM) and Meinhardt Infrastructure and Environment Limited (Meinhardt) are
commissioned to undertake the roles of Environmental Team (ET) and the
Independent Environmental Checker (IEC), respectively, to undertake the
EM&A activities for the Project in accordance with the requirements specified in
the EP, updated EM&A Manual (), approved EIA
Report ()
taking account of the latest design and other relevant statutory requirements.
The SENTX is a
piggyback landfill, occupying the southern part of the existing SENT Landfill
(including its infrastructure area) and 13 ha of Tseung Kwan O (TKO) Area 137.
A layout plan of the SENTX is shown in Figure
1.1. Under the latest design, the SENTX has a net void capacity of
about 6.5 Mm3 and provides an additional lifespan of about 6 years,
commencing operation upon exhaustion of the SENT Landfill. The SENTX will
receive construction waste only.
The key implementation
milestones of the Project are indicatively summarised in Table
1.1. The construction works of the Project commenced on 2 January 2019.
Table 1.1 Estimated Key Dates of
Implementation Programme
|
Key Stage
of the Project
|
Indicative
Date
|
|
Start
construction
|
2 January
2019
|
|
Commissioning
of new infrastructure facilities
|
2020
|
|
Demolition
of existing infrastructure facilities
|
2021
|
|
Start
waste intake at SENTX
|
2021 or upon
exhaustion of SENT Landfill
|
|
Estimated
exhaustion date of SENTX
|
2027
|
|
End of
aftercare for SENTX
|
2057
|
The major construction
works of the SENTX includes:
·
Site
formation at the TKO Area 137 and the existing infrastructure area at SENT
Landfill;
·
Construction
of surface and groundwater drainage systems;
·
Construction
of the leachate containment and collection systems;
·
Construction
of new leachate and landfill gas treatment facilities, site offices,
maintenance yards at the new infrastructure area;
·
Construction
of new pipelines to transfer the leachate and landfill gas collected from the
existing SENT Landfill to the treatment facilities at the new infrastructure
area;
·
Construction
of the site access and new waste reception facilities; and
·
Demolition
of the facilities at the existing SENT Landfill infrastructure area.
This is the Quarterly
EM&A Report for the Project which summarises the key findings of the
EM&A programme during the reporting period from 1 October to 31 December 2020
for the construction works.
The organisation
structure of the Project is presented in Figure 1.2.
Figure
1.2 Organisation
Chart
Contact details of the
key personnel are summarized in Table 1.2 below.
Table 1.2 Contact
Information of Key Personnel
|
Party
|
Position
|
Name
|
Telephone
|
|
Contractor
(Green Valley Landfill
Limited)
|
Project Manager
|
Gary Barnicott
|
2706 8827
|
|
Complaint Hotline
|
|
|
|
Environmental Team (ET)
(ERM-Hong Kong, Limited)
|
ET Leader
|
Frank Wan
|
2271 3152
|
|
Independent
Environmental Checker (IEC)
(Meinhardt
Infrastructure and Environment Limited)
|
IEC
|
W.K.
Chiu
|
2858
0738
|
The programme of the
construction is shown in Annex
A. As informed by the Contractor, the major works carried out in this
reporting period include:
October 2020
· Electro-mechanical
installation at landfill gas (LFG) plant;
· Dry testing at LFG
plant;
· Installation of cables
and cable containment at Leachate Treatment Plant (LTP) area;
· Electro-mechanical
installation (including pipe) at LTP area;
· Dry testing at LTP;
· Building
services works and fitting-out works for infrastructure buildings (EPD
building, GVL building and laboratory building);
· Construction of
superstructure of fire service tank room and water service room;
· Construction of pits and
ducting for underground utilities;
· Installation of diesel
fuel tanks;
· Sewerage system works for
infrastructure buildings;
· Water main pipe
installation for infrastructure buildings;
· Construction of
perimeter bund channel;
· Equipment installation
at sump house 1 and 2;
· Structure work for sump
house 3;
· Surface
channel works at buttress wall;
· Maintenance
and improvement of temporary surface water drainage;
· Filling work
at the transition area between buttress wall and Cell 2X and at West of Cell
3X;
· Construction
of Cell 3X formation;
· Construction
of footing of vehicle washing facilities, weighbridge and guard house;
· Underground utilities
and pipes installation at waste reception area;
· Installation
of HDPE pipes for leachate collection system;
· Installation
of water mains and telecom pipes;
· Sewerage
system works at
waste reception area; and
· Civil
provision works (draw pits and ducts laying) for Extra-low voltage (ELV)
and low voltage (LV) cables.
November 2020
·
Electro-mechanical
installation at LFG plant;
·
Dry
testing at LFG plant;
·
Installation
of chimney at LFG plant;
·
Installation
of cables and cable containment at LTP area;
·
Electro-mechanical
installation (including pipe) at LTP area;
·
Dry
testing at LTP;
·
Building
services works and fitting-out works for infrastructure buildings (EPD
building, GVL building and laboratory building);
·
Steel
members installation for superstructure of maintenance building;
·
Construction
of superstructure of fire service tank room and water service room;
·
Windows
and doors installation at fire service tank room and water service room;
·
Construction
of pits and ducting for underground utilities;
·
Installation
of diesel fuel tanks;
·
Sewerage
system works for
infrastructure buildings;
·
Water
main pipe installation for infrastructure buildings;
·
Construction
of perimeter bund channel;
·
Equipment
installation at sump house 1 and 2;
·
Surface
channel works at buttress wall;
·
Filling
works at the West of Cell 3X;
·
Maintenance
and improvement of temporary surface water drainage;
·
Construction
of Cell 3X formation;
·
Construction
of Mechanically
Stabilized Earth (MSE) wall;
·
Installation
of steel members for vehicle washing facilities;
·
Underground
utilities and pipes installation at waste reception area;
·
Installation
of water mains and telecom pipes;
·
Sewerage
system works at
waste reception area; and
·
Civil
provision works (draw pits and ducts laying) for ELV and LV cables.
December 2020
·
Installation
of cables and cable containment at LTP area;
·
Electro-mechanical
installation (including pipe) at LTP area;
·
Testing
and commissioning at LTP;
·
Building
services works and fitting-out works for infrastructure buildings (EPD
building, GVL building and laboratory building);
·
Steel
members installation for superstructure of maintenance building;
·
LV
cables laying to infrastructure buildings;
·
Water
main pipe installation for infrastructure buildings;
·
Road
pavement for the emergency vehicular access (EVA);
·
Equipment
installation at sump house 1 and 2;
·
Filling
works at the West of Cell 3X;
·
Maintenance
and improvement of temporary surface water drainage;
·
Construction
of Cell 3X formation;
·
Liner
installation at Cell 3X;
·
Construction
of MSE wall;
·
Road
pavement for EVA along Western Bund from main entrance;
·
Installation
of steel members for vehicle washing facilities;
·
Underground
utilities and pipes installation at waste reception area;
·
Cable
laying by PCCW; and
·
Sewerage
system works at
waste reception area.
The implementation
schedule of the mitigation measures recommended in the Updated EM&A Manual is
presented in Annex B.
The status for all
environmental aspects are presented in Table 1.3. The EM&A
requirements remained unchanged during the reporting period.
Table 1.3 Summary
of Status for the Environmental Aspects under the Updated EM&A Manual
|
Parameters
|
Status
|
|
Air Quality
|
|
Baseline Monitoring
|
The results of baseline air
quality monitoring were reported in Baseline Monitoring Report and
submitted to EPD under EP Condition 3.3
|
|
Impact Monitoring
|
On-going
|
|
Noise
|
|
Baseline Monitoring
|
The results of baseline
noise monitoring were reported in Baseline Monitoring Report and
submitted to EPD under EP Condition 3.3
|
|
Impact Monitoring
|
On-going
|
|
Surface Water Quality
|
|
Baseline Monitoring
|
The results of baseline surface
water quality monitoring were reported in Baseline Monitoring Report
and submitted to EPD under EP Condition 3.3
|
|
Impact Monitoring
|
On-going
|
|
Waste Management
|
|
Waste Monitoring
|
On-going
|
|
Landscape and Visual
|
|
Baseline Monitoring
|
The results of baseline
landscape and visual monitoring were reported in Baseline Monitoring
Report and submitted to EPD under EP Condition 3.3
|
|
Construction Phase Audit
|
On-going
|
|
Site Environmental Audit
|
|
Regular Site Inspection
|
On-going
|
|
Complaint Hotline and Email
Channel
|
On-going
|
|
Environmental Log Book
|
On-going
|
|
Groundwater Quality
|
|
|
Pre-operation Baseline
Monitoring
|
Commenced on 24 March 2020
|
|
Landfill Gas
|
|
|
Pre-operation Baseline
Monitoring
|
Commenced on 24 March 2020
|
|
Ambient VOCs, ammonia and H2S
|
|
Pre-operation Baseline
Monitoring
|
Commenced on 27 May 2020
|
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
Three
environmental management meetings were held with the Contractor, ER, ET, IEC
and EPD on 22 October, 26 November and 22 December 2020; and
Ÿ
Environmental
toolbox trainings on the following topics were provided by the Contractor to
the workers:
Ÿ
Chemical
Waste Handling on
6 October 2020;
Ÿ
Dark
Smoke on 20
October 2020;
Ÿ
Green
Procurement on
17 November 2020;
Ÿ
Site
Practice for Waste Reduction in Construction Industry on 25 November 2020;
Ÿ
Air
Pollution Control (NRMM) Regulation on 11 December 2020; and
Ÿ
VOC
and Smog on
16 December 2020.
The status of
statutory environmental compliance with the EP conditions under the EIAO,
submission status under the EP and implementation status of the recommended mitigation
measures are presented
in Table 1.4.
Table
1.4 Status
of Submissions required under the EP and Implementation Status of the
recommended Mitigation Measures
|
EP
Condition
|
Submission
/ Implementation Status
|
Status
|
|
2.3
|
Management
Organisation of Main Construction Companies
|
Submitted
and accepted by EPD.
|
|
2.4
|
Setting
up of Community Liaison Group
|
Community
Liaison Group was set up.
|
|
2.5
|
Submission
of Detailed Landfill Gas Hazard Assessment Report
|
Submitted,
and accepted by EPD on 10 January 2019.
|
|
2.6
|
Submission
of Restoration and Ecological Enhancement Plan
|
Submitted
to EPD on 28 June 2019.
|
|
2.7
|
Setting
up of Trial Nursery
|
Trial
Nursery works was commenced on 28 August 2019.
|
|
2.8
|
Advance
Screen Planting
|
Advance
Screen Planting works were completed on 28 June 2019.
|
|
2.9
|
Provision
of Multi-layer Composite Liner System
|
Under
implementation.
|
The environmental
licenses and permits (including EP, Water Pollution Control Ordinance
(WPCO) discharge license, registration as a chemical waste producer, and
construction noise permit) that are valid in the reporting period are presented
in Table 1.5. No non-compliance with environmental statutory
requirements was identified.
Table
1.5 Status
of Statutory Environmental Requirements
|
Description
|
Ref No.
|
Status
|
|
Environmental Permit
|
EP-308/2008
|
Granted on 5 August 2008
|
|
Variation of Environmental Permit
|
EP-308/2008/A
|
Granted on 6 January 2012
|
|
EP-308/2008/B
|
Granted on 20 January 2017
|
|
Further Environmental Permit
|
FEP-01/308/2008/B
|
Granted on 16 May 2018
|
|
Water Discharge License under WPCO (Permit Holder: Chun
Wo)
|
Licence No.: WT00033525-2019
|
Validity from 27 March 2019 to 31 March 2024
|
|
Billing Account for Disposal of Construction Waste
|
Chit Account Number: 5001692
|
Approved on 28 December 2005
|
|
Registration as a Chemical Waste Producer (Permit Holder:
Chun Wo)
|
5213-839-C3507-10
|
Issued on 23 August 2018
|
|
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-RE0542-20
|
Validity from 1 September 2020 to 28 February 2021
|
|
Construction Noise Permit (Permit Holder: Chun Wo)
|
GW-RE0516-20
|
Validity from 17 June 2020 to 7 December 2020
|
|
|
GW-RE1047-20
|
Validity from 9 December 2020 to 7 June 2021
|
|
Construction Noise Permit (Permit Holder: REC)
|
GW-RE0466-20
|
Validity from 1 June 2020 to 31 October 2020
|
|
|
GW-RE0889-20
|
Validity from 1 November 2020 to 31 March 2021
|
2
EM&A
Results
The EM&A programme for
the Project required environmental monitoring for air quality, noise and
surface water quality as well as environmental site inspections for air
quality, noise, surface water quality, waste management, and landscape and
visual impacts. The EM&A requirements and related findings for each
component are summarised in the following sections.
2.1.1
Monitoring
Requirements and Equipment
According to the updated EM&A Manual of the
Project, impact air quality monitoring (dust, in term of Total Suspended
Particulates (TSP)) was carried out at the two designated monitoring locations (i.e. DM1 and DM2) at a 6-day
interval.
It is proposed and agreed by IEC and EPD that the two existing TSP monitoring
stations (i.e. TKO-A1 and TKO-A2a) currently operating by the Civil Engineering
and Development Department (CEDD) can be used to monitor the 24-hour TSP
impact associated with the SENTX construction. The dust monitoring results
were obtained from CEDD on regular basis.
The Action and Limit
Levels of the air quality monitoring is provided in Table 2.1 below.
Table
2.1 Action
and Limit Levels for 24-hour TSP
|
Monitoring Station
|
Action Level
|
Limit Level
|
|
DM-1 – Site
Egress of TKO Area 137 Fill Bank
|
204 µg m-³
|
260 µg m-³
|
|
DM-2A –Combined
Reception and Exit Office (CREO) of TKO Area 137 Fill Bank
|
193 µg m-³
|
260 µg m-³
|
High volume air
samplers (HVSs) in compliance with the specifications listed under Section
3.2.2 of the updated EM&A Manual were used to measure 24-hour TSP levels at
the CEDD dust monitoring stations. The HVSs were calibrated upon installation
and thereafter at bi-monthly intervals to check the validity and accuracy of
the results.
The equipment used in
the impact air quality monitoring
programme and
monitoring locations are summarised in Table 2.2 and illustrated in Figure 2.1 respectively.
Table
2.2 Dust
Monitoring Details
|
Monitoring Station
|
Location
|
Parameter
|
Frequency and Duration
|
Monitoring Dates
|
Equipment
|
|
DM1
|
Site Egress of TKO Area 137 Fill Bank
|
24-hour TSP
|
Once every 6 days during the construction
phase of the Project
|
1, 7, 13, 19, 25, 31 October 2020
6, 12, 18, 24, 30 November 2020
6, 12, 18, 24, 30 December 2020
|
HVS Greasby 105 (S/N: 9795 (ET/EA/003/18))
|
|
DM2
|
Combined Reception and Exit Office (CREO) of TKO Area 137
Fill Bank
|
HVS
Andersen G1051 (S/N: 1176 (ET/EA/003/05))
|
2.1.2
Monitoring
Schedule for the Reporting Period
The schedule for air
quality monitoring during the reporting period is provided in Annex C.
2.1.3
Results
and Observations
The 24-hour TSP monitoring
results are summarised in Table 2.3. The detailed monitoring results
and the graphical presentation of the 24-hour TSP monitoring results at each
monitoring location are provided in Annex D1.
Table 2.3 Summary
of 24-hour TSP Monitoring Results in the Reporting Period
|
Month
|
Monitoring
Station
|
24-hr
TSP Concentration (µg m-3)
|
Action
Level (µg/m3)
|
Limit
Level (µg/m3)
|
|
Average
|
Range
|
|
October
2020
|
DM-1
|
108
|
95
- 114
|
204
|
260
|
|
DM-2
|
100
|
84
- 115
|
193
|
260
|
|
November
2020
|
DM-1
|
107
|
98
- 115
|
204
|
260
|
|
DM-2
|
99
|
91
- 106
|
193
|
260
|
|
December
2020
|
DM-1
|
106
|
100
- 116
|
204
|
260
|
|
DM-2
|
100
|
91
- 112
|
193
|
260
|
The major dust sources
in the reporting period included fugitive dust emission from exposed area in
SENTX, as well as nearby operations of the existing SENT landfill and the TKO
Area 137 Fill Bank.
All the 24-hour TSP
results measured at the two monitoring stations were below the Action and Limit
Levels in the reporting period. No additional measure is thus required in
accordance with the Event and Action Plan presented in Annex D2.
2.1.4
Meteorological
Data
Meteorological data
obtained from the on-site meteorological monitoring station at the existing
SENT landfill (see Figure 2.1) were used for the dust monitoring and are
shown in Annex D3.
The meteorological station will be moved to a new location at SENTX infrastructure
area as per the updated EM&A Manual after the construction of the new
infrastructure area is completed. For the purpose of this EM&A programme,
it is considered that meteorological data obtained at the existing SENT
landfill meteorological monitoring station are representative of the Project
area and could be used for the interpretation of the construction phase dust
monitoring results.
2.2.1
Monitoring
Requirements and Equipment
According to the updated EM&A Manual of the
Project, impact noise monitoring was conducted weekly at the monitoring
location (i.e.
NM1) to
obtain one set of 30 minutes measurement between 07:00 and 19:00 hours on
normal weekdays.
The Action and Limit
Levels for construction noise of the Project are provided in Table 2.4
below.
Table 2.4 Action
and Limit Levels for Construction Noise
|
Time Period
|
Action Level (a)
|
Limit Level (b)
|
|
07:00 – 19:00 hrs on normal
weekdays
|
When one documented complaint is
received from any one of the noise sensitive receivers (NSRs)
or
75 dB(A) recorded at the
monitoring station
|
75 dB(A) at NSRs
|
|
Notes:
(a) 75dB(A)
along and at about 100m from the SENTX site boundary was set as the Action
Level.
(b) Limits
specified in the GW-TM and IND-TM for construction and operational noise,
respectively.
|
Noise monitoring was
performed by ALS Technichem (HK) Pty Ltd (HOKLAS Registration No. 066) using a sound
level meter placed at the designated monitoring station NM1 (see Figure 2.1) in accordance with the requirements
stipulated in the updated EM&A Manual. Acoustic
calibrator was deployed to check the sound level meter at a known sound
pressure level. Details of the deployed equipment are provided in Table 2.5.
Table
2.5 Noise
Monitoring Details
|
Monitoring Station (1)
|
Location
|
Parameter
|
Frequency and Duration
|
Monitoring Dates
|
Equipment
|
|
NM1
|
SENTX Site Boundary
(North)
|
Leq (30 min) measurement
between 07:00 and 19:00 hours on normal weekdays
(Monday to Saturday)
|
Once per week for 30 mins
during the construction period of the Project
|
7, 15, 21, 29 October 2020
5, 12, 19, 25 November 2020
3, 10, 17, 23, 31 December
2020
|
Sound Level Meter:
B&K 2238 (S/N: 2285722)
Rion NL-52 (S/N: 00921191)
Rion NL-52 (S/N: 00142581)
Acoustic Calibrator:
Rion NC-74 (S/N: 34657230)
Rion NC-73 (S/N: 10655561)
3M AC-300 (S/N: AC300005555)
|
2.2.2
Monitoring
Schedule for the Reporting Period
The schedule for noise
monitoring during the reporting period is provided in Annex C.
2.2.3
Results
and Observations
A total of 13 impact
noise monitoring events were scheduled during the reporting period. The noise
monitoring results are summarised in Table 2.6 and graphically presented
in Annex E1.
Table 2.6 Summary
of Construction Noise Monitoring Results in the Reporting Period
|
Month
|
Monitoring
Station
|
Measured Noise Level Leq
(30 min), dB(A)
|
|
Average
|
Range
|
Action and Limit Level
|
|
October
2020
|
NM1
|
53.1
|
51.1 – 55.8
|
75
|
|
November
2020
|
NM1
|
50.7
|
48.1 – 52.2
|
75
|
|
December
2020
|
NM1
|
51.2
|
48.9 – 52.9
|
75
|
Major noise sources
identified during the noise monitoring included noise from operations of the
existing SENT landfill and the TKO Area 137 Fill Bank, aircrafts and insects.
No exceedance of the Action
and Limit Levels for construction noise monitoring was recorded in the
reporting period. No further mitigation measure was required in accordance
with the Event and Action Plan presented in Annex E2.
2.3
Surface Water Quality
Monitoring
2.3.1
Monitoring
Requirements and Equipment
According to the
updated EM&A Manual of the Project, impact surface water quality monitoring
were carried out at the three designated surface water discharge points (i.e.
DP3, DP4 and DP6) weekly to ensure that the SENTX will not cause adverse water
quality impact. Temporary relocation of surface water discharge point DP4 to
DP4 (Future, temporary) as an interim arrangement due to site constraints and
construction sequence was approved by EPD on 14 May 2019. Impact surface water
quality monitoring was carried out at DP4 (Future, temporary) (i.e. DP4T) from
the monitoring event on 16 May 2019. In addition, suspension of impact surface water
quality monitoring at DP3 was approved under the Baseline Monitoring Report by
EPD on 24 July 2019 until the actual commencement of construction works
affecting DP3 in 2021.
Dissolved Oxygen (DO)
and pH value were measured in situ whereas the level of suspended solids
(SS) were determined by ALS Technichem (HK) Pty Ltd (HOKLAS Registration No.
066).
The Action and Limit
Levels of the surface water quality impact monitoring are provided in Table
2.7.
Table
2.7 Action and Limit Levels for Surface Water Quality
|
Parameters
|
Action
Level
|
Limit
Level
|
|
|
DP4
& DP6
|
|
|
DO
|
<
5.80 mg/L
|
<
5.42 mg/L
|
|
SS
|
>
11.7 mg/L
|
>
12.7 mg/L
|
|
pH
|
>
8.39
|
>
8.40
|
The locations of the
monitoring stations for the Project are shown in Figure 2.1. All in situ monitoring instruments
were checked, calibrated and certified by a laboratory accredited under HOKLAS
or other international accreditation scheme before use, and subsequently
re-calibrated at 3 monthly intervals throughout all stages of the surface water
quality monitoring programme. Calibration for a DO meter was carried out
before measurement according to the instruction manual of the equipment model.
Details of the equipment used in the impact surface water quality monitoring works are provided in Table
2.8.
Table
2.8 Impact
Surface Water Quality Monitoring Details
|
Monitoring Station
|
Location
|
Frequency
|
Monitoring Dates
|
Parameter
|
Equipment
|
|
DP4 (Future, temporary)
|
Surface
water discharge point DP4
|
Weekly
|
7, 15, 21, 29 October 2020
5, 12, 19, 25 November 2020
3, 10, 17, 23, 31 December 2020
|
•pH
•DO
•SS
|
YSI Professional DSS (S/N: 17B102764)
YSI
Professional DSS (S/N: 15H103928)
pH Meter AZ8685 (S/N:1259868)
|
|
DP6
|
Surface
water discharge point DP6
|
|
Notes:
(a) DP4
was temporary relocated to DP4 (Future, temporary) (i.e. DP4T) as an interim
discharge point from the monitoring event on 16 May 2019.
(b) Impact
surface water quality monitoring at DP3 was suspended from the monitoring
event on 25 July 2019 until the actual commencement of construction works
affecting DP3 in 2021.
|
2.3.2
Monitoring
Schedule for the Reporting Period
The schedule for surface
water quality monitoring during the reporting period is provided in Annex C.
2.3.3
Results
and Observations
A total of 13
monitoring events for impact surface water quality monitoring were scheduled at
all designated monitoring stations during the reporting period. However,
sampling could not be carried out at the monitoring events below due to insufficient
flow:
· 7 October 2020 at all
monitoring locations;
· 15 October 2020 at DP4
(Future, temporary);
· 21 October 2020 at all
monitoring locations;
· 29 October 2020 at all
monitoring locations;
· November 2020 at all
monitoring locations; and
· December 2020 at all
monitoring locations;
Impact
water quality monitoring results and graphical presentations are provided in Annex F1.
Action and Limit Level
exceedance was recorded for surface water quality impact monitoring in the
reporting period and actions in accordance with the Event and Action Plan
presented in Annex
F2
were undertaken. Investigation on the Action and Limit Levels exceedance was
conducted and summarised in Table 2.9 below. Investigation report of
the exceedance is presented in Annex F3.
Table
2.9 Details
of Exceedances Recorded for Surface Water Quality Monitoring
|
Date
|
Monitoring Location
|
Parameter
|
Type of Exceedance
|
Remarks
|
|
15 October 2020
|
DP6
|
SS
|
Limit Level
|
Project-related
|
Based on the
investigation conducted for the monitoring event with potential Action and
Limit Levels exceedance with the Contractor, and the IEC, the SS exceedance at
DP6 on 15 October 2020 was found deemed to Project-related activities.
The Contractor was
reminded to implement all relevant mitigation measures for the construction
works and maintain good site practice. The ET will keep track on the
monitoring data and ensure Contractor’s compliance of the environmental
requirements.
2.4.1
Monitoring
Requirements
According to the updated EM&A Manual of the
Project, the monthly landscape and visual audit was conducted on 21 October, 24 November
and 23 December 2020 to monitor the implementation of the landscape and
visual mitigation measures during construction phase.
All relevant environmental
mitigation measures listed in the approved EIA Report and the updated EM&A
Manual and their implementation status are summarised in Annex B.
2.4.2
Results
and Observations
The Contractor has
implemented environmental mitigation measures as stated in the approved EIA
Report and the EM&A Manual.
Regarding the landscape
and visual audit, the Contractor was reminded to maintain the advance screen
planting works as soon as possible to ensure effective screening of views of
project works from the High Junk Peak Trail. The Contractor has considered the
mitigation measures during the design phase, including the preparation of the
Construction Drawings and Detailed Landscape Design Drawings.
Site inspections were
carried out on a weekly basis with the Contractor, IEC and ER to monitor the
implementation of proper environmental pollution control and mitigation
measures
for air quality, noise, surface water quality and waste management under the
Project. In the reporting period, 13 site inspections were carried out on 8,
15, 22 and 29 October, 5, 12, 19 and 26 November, 3, 10, 17, 22 and 31 December
2020.
Key observations during the site
inspections are summarized in Table 2.10.
Table 2.10 Key
Observations Identified during the Site Inspections in this Reporting Period
|
Inspection Date
|
Environmental Observations
and Recommendations
|
|
8 October 2020
|
·
The Contractor shall replace the faded NRMM
label displayed on the crane near future LFG plant.
·
The Contractor shall replace the lock of the
chemical waste cabinet and ensure the cabinet is locked at all times.
·
The Contractor shall provide drip tray for
the chemical stored near site entrance.
·
The Contractor shall clean up the chemical
spillage near future GVL building and treat the clean-up materials as
chemical waste.
·
The Contractor shall avoid accumulation of
stagnant water near future weighbridge, GVL building, maintenance building
and LTP.
·
The Contractor shall remove the general
refuse near future water services house and dispose of the waste accumulated
on site regularly.
|
|
22 October 2020
|
·
The Contractor shall remove the general
refuse accumulated at the temporary drain along Southern site boundary and
dispose of the waste regularly.
·
The Contractor shall provide drip tray for
the chemical stored at future EPD building.
|
|
29 October 2020
|
·
The Contractor shall replace the faded NRMM
label displayed on the generator near DP4T.
·
The Contractor shall clean up the oil
spillage near site entrance and at the generator near DP4T and treat the clean-up
materials as chemical waste.
·
The Contractor shall maintain the drip trays
of the chemicals stored at the Wetsep near DP4T and provide drip tray for
chemical stored at future GVL building.
·
The Contractor shall remove the stagnant
water accumulated in the drip tray near DP6 and treat the clean-up materials
as chemical waste.
·
The Contractor shall avoid accumulation of
stagnant water at LTP area and spray larvicides for mosquito control.
·
The Contractor shall remove the general
refuse accumulated near future bioplant building, LTP and at the drains
around LTP and dispose of the waste regularly.
|
|
8 October 2020
|
·
The Contractor shall replace the faded NRMM
label displayed on the crane near future LFG plant.
·
The Contractor shall replace the lock of the
chemical waste cabinet and ensure the cabinet is locked at all times.
·
The Contractor shall provide drip tray for
the chemical stored near site entrance.
·
The Contractor shall clean up the chemical
spillage near future GVL building and treat the clean-up materials as
chemical waste.
·
The Contractor shall avoid accumulation of
stagnant water near future weighbridge, GVL building, maintenance building
and LTP.
·
The Contractor shall remove the general
refuse near future water services house and dispose of the waste accumulated
on site regularly.
|
|
5 November 2020
|
·
The Contractor shall clear the general refuse
and construction materials accumulated at the temporary drains along Southern
and Western site boundary regularly.
·
The Contractor shall maintain the drip trays
of the chemicals stored at the Wetsep near DP4T and provide drip trays for
chemicals stored at transition area, future GVL building and LTP.
·
The Contractor shall cover the cement stored
at future GVL building to minimise dust impact.
·
The Contractor shall clean up the oil
spillage near site entrance and treat the clean-up materials as chemical
waste.
·
The Contractor shall remove the stagnant
water accumulated in the LTP parts at future LTP to minimise pest issues.
|
|
12 November 2020
|
·
The Contractor shall implement dust control
measures when carrying out activities related to dusty materials (i.e.
handling of sawdust).
·
The Contractor shall remove the general
refuse accumulated near Cell 1X, future weighbridge, bioplant building, drain
around LTP, temporary drain along Southern site boundary, LTP sump pit and
near DP6 and dispose of the waste accumulated in the refuse skip near DP4T
regularly to minimise odour and pest issues.
·
The Contractor shall provide drip trays for
chemicals stored on the roof of future GVL building, at bioplant building and
near DP6.
·
The Contractor shall clean the chemical
toilets near Cell 1X and the room on 1/F of future GVL building to minimise
odour issues.
|
|
19 November 2020
|
·
The Contractor shall remove the general
refuse and maintain the bund at DP4T channel and ensure that all surface
water is treated before discharge.
·
The Contractor shall maintain the excavator
near Cell 2X, clean up the oil spillage at the excavator and treat the
clean-up materials as chemical waste.
·
The Contractor shall provide drip trays for
chemicals stored at DP4T Wetsep, future LTP and near DP6.
·
The Contractor shall remove the stagnant
water accumulated at future LTP regularly.
|
|
26 November 2020
|
·
The Contractor shall remove the deposited
silt and grit and the general refuse accumulated at DP6 channel regularly to
ensure it is functioning properly.
·
The Contractor shall clean up the oil
spillage at the drip trays near site entrance and future LFG plant and treat
the clean-up materials as chemical waste.
·
The Contractor shall remove the general
refuse around the site, especially near DP4T bar bending area, RC15, future
EPD building and DP6 and dispose the waste accumulated in the refuse skip
near Southern site boundary regularly.
|
|
3 December 2020
|
·
The Contractor shall remove the general
refuse near future GVL building, laboratory building and at the temporary
drain along Southern site boundary and dispose of the waste accumulated in
the refuse skip near DP4T regularly to minimise odour and pest issues.
·
The Contractor shall enhance dust control
measures when carrying out activities related to dusty materials (i.e.
handling of sawdust) near the fire services tank.
·
The Contractor shall provide drip tray for
the chemical stored near RC 15.
|
|
10 December 2020
|
·
The Contractor shall cover the cement stored
at future GVL building and enhance dust control measures when conducting
activities related to dusty materials.
·
The Contractor shall clean up the oil
spillage at the drip tray near DP6 and handle the clean-up as chemical waste.
·
The Contractor shall remove the general
refuse and construction waste accumulated at future LTP drain, DP6, DP6
material storage area, future bioplant building and bar bending area and
dispose of the waste regularly.
|
|
17 December 2020
|
·
The Contractor shall display a NRMM label on
the generator near Cell 1X.
·
The Contractor shall provide sufficient drip
trays and store the chemicals near site entrance, Harvest storage rea and bar
bending area in proper containers.
·
The Contractor shall designate an area for
concrete truck washing to ensure that the wash-water will not be discharged
to the surface water channel.
·
The Contractor shall remove the general
refuse accumulated at Harvest storage area and dispose of the waste
regularly.
|
|
22 December 2020
|
·
The Contractor shall clean up the oil
spillage around the excavator at Cell 1X and treat the clean-up materials as
chemical waste.
·
The Contractor shall remove the deposited
silt and grit at the sediment tank near wheel washing facilities regularly.
·
The Contractor shall replace the faded NRMM
label displaced on the generator near bar bending area.
|
|
31 December 2020
|
·
The Contractor shall enhance watering around
the site, especially near Cell 3X and along Western site boundary.
·
The Contractor shall provide drip trays for
the chemicals stored near Cell 2X.
·
The Contractor shall avoid accumulation of
stagnant water and remove the general refuse accumulated at DP6.
·
The Contractor shall remove the general
refuse and construction waste near future EPD building and dispose of the
waste regularly.
|
The Contractor has
rectified all of the observations identified during environmental site
inspections in the reporting period. Key environmental deficiencies identified
and the corresponding rectification actions are presented in Table 2.11.
Table
2.11 Summary
of Environmental Deficiencies Identified and Corresponding Additional Control
Measures
|
Deficiencies
|
Rectifications
Implemented
|
Proposed
Additional Control Measures
|
|
Surface Water
|
|
Intercepting
channels & drainage system
|
Ÿ Reviewed
drainage plan.
|
Ÿ Provision
of additional drainage channels.
Ÿ Expedite
the construction of permanent sediment trap and discharge culverts.
|
|
DP
channels (design & regular silt removal)
|
Ÿ
Carried out regular
maintenance and cleaning of channels.
Ÿ DP4
channel: Area near the channel was paved with concrete and a bund was built.
Ÿ DP6
channel: Gravel piles on the channel were covered with concrete which serve
as blocks for running water and to divide the channel into several sections. A
pump was placed in the water zone in the upstream section to pump water to
the Wetsep for treatment prior to the discharge to the last section before
the weir plate.
Ÿ
DP6: Pipes through the gravel piles between
different channel sections were covered with geotextiles to block debris and silt.
|
N.A.
|
|
Stockpiles
& exposed soil
|
Ÿ Installed silt fencing near surface water channel along DP6
channel.
|
Ÿ Improve
soil covering.
Ÿ Compaction
and cover for stockpiles and soil slopes.
|
|
Wetsep
(treatment capacity & number)
|
Ÿ Reviewed
Wetsep capacity.
Ÿ Chemicals
dosage of the Wetsep was increased to enhance the efficiency.
|
Ÿ Install
additional Wetsep.
|
|
Backflow
/ ponding during heavy rainfall
|
Ÿ Raised
with EPD (LDG) and CEDD.
|
N.A.
|
The Contractor has registered
as a chemical waste producer under the Contract. Sufficient numbers of
receptacles were available for general refuse collection and sorting.
As informed by the
Contractor, waste generated during this reporting period include mainly inert
C&D materials. Reference has been made to the waste flow table prepared by
the Contractor. The quantities of different types of wastes and imported fill
materials are summarised in Table 2.12.
Table 2.12 Quantities
of Different Waste Disposed and Imported Fill Materials
|
Month/
Year
|
Inert
C&D Materials (a)
(in ‘000m3)
|
Imported
Fill
(in ‘000kg) (b)
|
Inert
Construction Waste Re-used
(in ‘000m3)
|
Non-inert
Construction Waste (c)
(in ‘000m3)
|
Recyclable
Materials (d) (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
October 2020
|
2.641
|
0
|
10890.45
|
0
|
0.143
|
0
|
0
|
|
November
2020
|
4.643
|
0
|
9492.530
|
0
|
0.144
|
0
|
0
|
|
December
2020
|
2.563
|
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 (t/m3) for public fill.
(b) Imported fill refers
to materials generated from other project for on-site resue.
(c) Non-inert
construction wastes include general refuse disposed at landfill. Density
assumption: 0.9 (t/m3) 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
suspended solids (SS) was recorded for surface water quality impact monitoring
in the reporting period. The SS exceedance at DP6 on 15 October 2020 was found
deemed to Project-related activities.
Cumulative statistics
on exceedances is provided in Annex G.
There were no complaints,
notification of summons or prosecution recorded in the reporting period.
Statistics on
complaints, notifications of summons and successful prosecutions are summarised
in Annex G.
3
Conclusion
and Recommendation
This Quarterly EM&A
Report presents the findings of the EM&A activities undertaken during the
period from 1 October to 31 December 2020 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 SS was recorded for surface water quality impact monitoring in
the reporting period. The SS exceedance at DP6 on 15 October 2020 was found
deemed to Project-related activities.
Thirteen environmental site
inspections were carried out during the reporting period. Environmental
deficiencies were identified during the site inspection and the Contractor has
proposed additional control measures to rectify the deficiencies.
There were no
complaints, notification of summons or prosecution recorded in the reporting
period.
It is noted that most
environmental pollution control and mitigation measures were properly
implemented and the construction activities of the Project did not introduce
any adverse impact to the sensitive receivers in the reporting period. Yet,
some environmental deficiencies were identified during the reporting period and
additional control measures have been proposed by the Contractor to rectify the
corresponding deficiencies. The monitoring programme has been reviewed and was
considered as adequate to cater for the nature of works in progress. Change to
the monitoring programme was thus not recommended at this stage. The
monitoring programme will be evaluated as appropriate in the next reporting
period. The ET will keep track on the construction works to confirm compliance
of environmental requirements and the proper implementation of all necessary
mitigation measures.
