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 Annual
EM&A Review Report for the Project which summarises the key findings of the
EM&A programme during the reporting period from 1 January 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
|
|
2706 8682
|
|
Environmental Team (ET) (ERM-Hong
Kong, Limited)
|
ET Leader
|
Frank Wan
|
2271 3152
|
|
Independent
Environmental Checker (IEC)
(Meinhardt Infrastructure
and Environment Limited)
|
IEC
|
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:
·
Building services works and fitting-out works for Landfill Gas (LFG)
Plant area;
·
Paving works at LFG Plant area;
·
Flares and cooling towers installation of LFG Plant;
·
Laying cables in CLP room and energization of LFG plant;
·
Drip leg and electro-mechanical installation at LFG Plant;
·
Installation of canopy at LFG plant;
·
Electro-mechanical installation at LFG plant;
·
Dry testing at LFG plant;
·
Installation of chimney at LFG plant;
·
Civil provisional works of Leachate
Treatment Plant (LTP) and superstructure of Bioplant building;
·
Installation of ammonia stripping plant, equalization tank, sequencing
batch reactor tank, treated effluent tank and Glass Reinforced Plastic (GRP)
tanks at LTP area;
·
Installation of accessories such as staircases, pipes and
walkways for equalization tanks, sequencing batch reactor tanks, treated
effluent tank, GRP tanks and other tanks at LTP area;
·
Installation of cables and cable containment for LTP area;
·
Building services works and fitting-out works for LTP area and
installation of drip leg;
·
Electro-mechanical installation (including pipe) at LTP area;
·
Dry testing at LTP;
·
Testing and commissioning at LTP;
·
Rebar fixing, formwork and concreting to the superstructure of
laboratory building;
·
Building services works and fitting-out works for
infrastructure buildings (EPD building, GVL building and laboratory building);
·
Sewerage system works for infrastructure
buildings;
·
Water main pipe installation for infrastructure
buildings;
·
Low voltage (LV) cables laying to infrastructure
buildings;
·
Steel members installation for superstructure of maintenance
building;
·
Construction of perimeter bund for Cell 2X;
·
Filling work at the transition area between
buttress wall and Cell 2X and at West of Cell 3X;
·
Finishing works for Western perimeter bund;
·
Maintenance and improvement of the temporary
surface water drainage;
·
Shotcreting and mass concrete for Buttress Wall;
·
Surface channel works at Buttress Wall;
·
Construction of drop inlet shaft, MHX1 manhole
and inlet and outlet box culverts;
·
Installing groundwater pipe works from South to North at Eastern
side from Cell 3X to 4X;
·
Installation of riser pipes from sump pits to sump houses 1 and
2;
·
Construction of sump house 1 and 2;
·
Equipment installation at sump house 1 and 2;
·
Structure work for sump house 3;
·
Installation of HDPE pipes for leachate
collection system;
·
Excavating, removing and replacing unsuitable fill materials;
·
Liner installation at Cell 1X and 2X;
·
Placing leachate stone at Cell 2X;
·
Construction of Cell 3X formation;
·
Construction of Mechanically Stabilized
Earth (MSE) wall;
·
Construction of footing of vehicle washing
facilities, weighbridge and guard house;
·
Installation of steel members for vehicle
washing facilities;
·
Road pavement for the emergency vehicular access
(EVA);
·
Pipe rack installation;
·
Installation of monitoring wells;
·
Installation of diesel fuel tanks;
·
Construction of plinths and footing of
maintenance building;
·
Construction of footing and superstructure of fire service tank
room and water tank room;
·
Windows and doors installation at fire service tank room and
water service room;
·
Construction of perimeter bund channel;
·
Construction of pits and ducting for underground utilities;
·
Underground utilities and pipes installation at waste reception
area;
·
Sewerage system works at waste reception
area;
·
Installation of water mains and telecom pipes;
·
Laying of Extra-low voltage (ELV) and LV
cables for draw pits and ducts; and
·
Civil provision works (draw pits and ducts
laying) for ELV and LV cables
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
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
Twelve environmental management
meetings were held with the Contractor, ER, ET, IEC and EPD on 8 January, 27
February, 19 March, 23 April, 21 May, 18 June, 16 July, 20 August, 24
September, 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
An Introduction to the
Air Pollution Control (Smoke) Regulations
on 6 January 2020;
Ÿ
Clean Recycling on 17 January 2020;
Ÿ
Quality Powered
Mechanical Equipment on 11 February 2020;
Ÿ
Green Procurement on 24 February 2020;
Ÿ
Mosquito Control on 8 March 2020;
Ÿ
Illegal Dumping on 25 March 2020;
Ÿ
Trip-Ticket System on 6 April 2020;
Ÿ
VOC and Smog on 27 April 2020;
Ÿ
Air Pollution Control
Regulation (Non-road Mobile Machinery (Emission)) on 8 May 2020;
Ÿ
Noise Control Ordinance
on 22 May 2020;
Ÿ
Persistent Organic
Pollutants on 12 June 2020;
Ÿ
Wastewater Management
at Construction Site on 23 June 2020;
Ÿ
Good Vehicle
Maintenance Practice on 6 July 2020;
Ÿ
Cut down Construction
Dust on 23 July 2020;
Ÿ
Mosquito Nuisance on 14 August 2020;
Ÿ
Clean Recycling on 27 August 2020;
Ÿ
Tree Protection Zone on 11 September 2020;
Ÿ
Renewable Energy on 18 September 2020;
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-RE0075-20
|
Validity from 12 February 2020 to 11 August 2020
|
|
|
GW-RE0542-20
|
Validity from 1 September 2020 to 28 February 2021
|
|
Construction Noise Permit (Permit Holder: Chun Wo)
|
GW-RE1001-19
|
Validity from 16 December 2019 to 10 June 2020
|
|
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-RE0029-20
|
Validity from 20 January 2020 to 31 May 2020
|
|
|
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
|
Equipment
|
|
DM1
|
Site Egress of TKO Area 137 Fill Bank
|
24-hour TSP
|
Once every 6 days during the construction phase
of the Project
|
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
|
|
January 2020
|
DM-1
|
110
|
95 - 124
|
204
|
260
|
|
|
DM-2
|
96
|
82 – 108
|
193
|
260
|
|
February 2020
|
DM-1
|
103
|
93 - 117
|
204
|
260
|
|
|
DM-2
|
90
|
83 – 104
|
193
|
260
|
|
March 2020
|
DM-1
|
102
|
91 - 113
|
204
|
260
|
|
|
DM-2
|
90
|
85– 94
|
193
|
260
|
|
April 2020
|
DM-1
|
105
|
95 - 122
|
204
|
260
|
|
|
DM-2
|
94
|
83 – 106
|
193
|
260
|
|
May 2020
|
DM-1
|
105
|
92 - 118
|
204
|
260
|
|
|
DM-2
|
93
|
83 – 103
|
193
|
260
|
|
June 2020
|
DM-1
|
96
|
86 - 105
|
204
|
260
|
|
|
DM-2
|
88
|
78 – 100
|
193
|
260
|
|
July 2020
|
DM-1
|
91
|
84 - 105
|
204
|
260
|
|
|
DM-2
|
85
|
77 - 99
|
193
|
260
|
|
August 2020
|
DM-1
|
103
|
88 - 116
|
204
|
260
|
|
|
DM-2
|
95
|
81 - 107
|
193
|
260
|
|
September 2020
|
DM-1
|
101
|
84 - 113
|
204
|
260
|
|
|
DM-2
|
97
|
90 – 105
|
193
|
260
|
|
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
|
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
|
Sound Level Meter:
B&K 2238 (S/N: 2285722) (S/N:
2285762)
Rion NL-31 (S/N: 00410221)
Rion NL-52 (S/N: 00921191) (S/N:
00142581)
Acoustic Calibrator:
Rion NC-74 (S/N: 34657230) (S/N:
34657231)
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 53 impact
noise monitoring events were scheduled during the reporting period. However, monitoring
was not conducted on 18 March, 20 and 28 May, 19 and 27 August and 3 September
2020 due to adverse weather condition. The noise monitoring results are
summarised in Table 2.6 and graphically presented in Annex E1.
Table 2.6 Summary
of Construction Noise Monitoring Results in the Reporting Period
|
Month
|
Monitoring Station
|
Measured Noise Level Leq
(30 min), dB(A)
|
|
Average
|
Range
|
Action and Limit Level
|
|
January 2020
|
NM1
|
50.5
|
47.8 – 53.0
|
75
|
|
February 2020
|
NM1
|
52.7
|
51.9 – 53.8
|
75
|
|
March 2020
|
NM1
|
52.5
|
50.5 – 54.9
|
75
|
|
April 2020
|
NM1
|
53.1
|
52.6 – 53.8
|
75
|
|
May 2020
|
NM1
|
53.0
|
51.1 – 54.9
|
75
|
|
June 2020
|
NM1
|
56.0
|
54.8 – 57.0
|
75
|
|
July 2020
|
NM1
|
55.1
|
53.6 – 56.8
|
75
|
|
August 2020
|
NM1
|
52.3
|
51.3 – 53.3
|
75
|
|
September 2020
|
NM1
|
53.1
|
51.7 – 55.2
|
75
|
|
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
|
Parameter
|
Equipment
|
|
DP4 (Future, temporary)
|
Surface water discharge point DP4
|
Weekly
|
•pH
•DO
•SS
|
YSI Professional Plus (S/N: 10G101946) (S/N: 15H103928)
YSI Professional DSS (S/N: 17B102764) (S/N:
15H102620) (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 53
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 the following monitoring events due to
insufficient flow:
·
January 2020 at all monitoring stations;
·
6, 12 and 27 February 2020 at all monitoring locations and 20
February 2020 at DP6;
·
March 2020 at all monitoring stations;
·
2, 16 and 24 April 2020 at DP6 and 29 April 2020 at all
monitoring locations;
·
7 and 14 May 2020 at all monitoring locations and 20 May 2020 at
DP4 (Future, temporary);
·
4 and 17 June 2020 at DP6, 11 June 2020 at DP4 (Future,
temporary) and 24 June 2020 at all monitoring locations;
·
9, 23 and 30 July 2020 at all monitoring locations and 15 July
2020 at DP6;
·
13 August 2020 at DP6 and 27 August 2020 at all monitoring
locations;
·
10, 23 and 30 September 2020 at all monitoring locations and 17
September 2020 at DP4 (Future, temporary);
·
7, 21 and 29 October 2020 at all monitoring locations and 15
October 2020 at DP4 (Future, temporary);
·
November 2020 at all monitoring stations; and
·
December 2020 at all monitoring stations.
Monitoring was cancelled
on 19 August and 3 September 2020 due to adverse weather condition. Impact water quality monitoring results and graphical
presentations are provided in Annex F1.
Exceedances of
the Action and Limit Levels were recorded for impact surface water quality
monitoring in the reporting period and actions in accordance with the Event and
Action Plan presented in Annex F2 were undertaken. Investigations on the
Action and Limit Levels exceedances were conducted and summarised in Table
2.9 below. Investigation reports of the exceedances are presented in Annex
F3.
Table 2.9 Details
of Exceedances of Action and Limit Levels for the Impact Surface Water Quality
Monitoring
|
Date
|
Monitoring Location
|
Parameter
|
Type of Exceedance
|
Remarks
|
|
20 February 2020
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
9 April 2020
|
DP6
|
pH
|
Limit Level
|
Project-related
|
|
9 April 2020
|
DP6
|
SS
|
Limit Level
|
Project-related
|
|
28 May 2020
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Project-related
|
|
28 May 2020
|
DP6
|
SS
|
Limit Level
|
Project-related
|
|
4 June 2020
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Project-related
|
|
3 July 2020
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
3 July 2020
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
15 July 2020
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Project-related
|
|
6 August 2020
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Project-related
|
|
6 August 2020
|
DP6
|
SS
|
Limit Level
|
Project-related
|
|
13 August 2020
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
17 September 2020
|
DP6
|
pH
|
Limit Level
|
Non Project-related
|
|
17 September 2020
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
15 October 2020
|
DP6
|
SS
|
Limit Level
|
Project-related
|
Based on the
investigation conducted for each of the monitoring event with potential Action
and Limit Levels exceedances with the Contractor, the ER and the IEC, the
exceedances were considered non Project-related, except the pH and SS
exceedances at DP6 on 9 April 2020, SS exceedances at DP4 (Future, temporary)
and DP6 on 28 May 2020, pH exceedance at DP4 (Future, temporary) on 4 June
2020, SS exceedance at DP4 (Future, temporary) on 15 July 2020, SS exceedances
at DP4 (Future, temporary) and DP6 on 6 August 2020 and SS exceedance at DP6 on
15 October 2020 which were found deemed to Project-related activities.
The Contractor shall
implement all relevant mitigation measures for the construction works and
maintain good site practice. The Contractor was reminded to control the
surface water discharge from site to minimise the potential surface water
impact in the coming rainy season. 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 31 January, 26 February, 25
March, 20 April, 27 May, 22 June, 22 July, 24 August, 28 September, 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, 52 site inspections were carried out on the following dates:
·
8, 16, 22 and 30 January 2020;
·
6, 12, 20 and 27 February 2020;
·
5, 12, 19 and 26 March 2020;
·
2, 9, 16, 23 and 29 April 2020;
·
7, 14, 21 and 28 May 2020;
·
4, 11, 18 and 24 June 2020;
·
2, 9, 16, 23 and 30 July 2020;
·
6, 13, 20 and 27 August 2020;
·
3, 10, 17, 24 and 30 September 2020;
·
8, 15, 22 and 29 October 2020;
·
5, 12, 19 and 26 November 2020; and
·
3, 10, 17, 22 and 31 December 2020.
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 2.10.
Table 2.10 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 2.11.
Table 2.11 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
|
|
January 2020
|
0.583
|
0
|
1742.440
|
0
|
0.122
|
0
|
0
|
|
February 2020
|
0.260
|
0
|
1992.480
|
0
|
0.076
|
0
|
0.195
|
|
March 2020
|
0.093
|
0
|
0
|
0
|
0.138
|
0
|
0
|
|
April 2020
|
0.033
|
0
|
0
|
0
|
0.158
|
0
|
0
|
|
May 2020
|
0.018
|
0
|
0
|
0
|
0.199
|
0
|
0
|
|
June 2020
|
0.030
|
0
|
0
|
0
|
0.179
|
0
|
0
|
|
July 2020
|
0.709
|
0
|
21691.630
|
0
|
0.192
|
0
|
0
|
|
August 2020
|
0.277
|
0
|
9780.700
|
0
|
0.125
|
16.230
|
0.150
|
|
September 2020
|
0.462
|
0
|
0
|
0
|
0.213
|
0
|
0.002
|
|
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. 3 exceedances of the Limit Level for pH
and 12 exceedances of the Limit Level for Suspended Solids (SS) were recorded
for surface water quality impact monitoring in the reporting period. The
exceedances were considered non Project-related upon further investigations,
except the pH and SS exceedances at DP6 on 9 April 2020, SS exceedances at DP4 (Future,
temporary) and DP6 on 28 May 2020, pH exceedance at DP4 (Future, temporary) on
4 June 2020, SS exceedance at DP4 (Future, temporary) on 15 July 2020, SS
exceedances at DP4 (Future, temporary) and DP6 on 6 August 2020 and SS
exceedance at DP6 on 15 October 2020 which 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 and successful prosecutions are summarised
in Annex G.
3
Conclusion and Recommendation
This
Annual EM&A Review Report presents the findings of
the EM&A activities undertaken during the period from 1 January 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. 3 exceedances of the Limit Level for pH and 12
exceedances of the Limit Level for Suspended Solids (SS) were recorded for
surface water quality impact monitoring in the reporting period. The
exceedances were considered non Project-related upon further investigations,
except the pH and SS exceedances at DP6 on 9 April 2020, SS exceedances at DP4 (Future,
temporary) and DP6 on 28 May 2020, pH exceedance at DP4 (Future, temporary) on
4 June 2020, SS exceedance at DP4 (Future, temporary) on 15 July 2020, SS
exceedances at DP4 (Future, temporary) and DP6 on 6 August 2020 and SS
exceedance at DP6 on 15 October 2020 which were found deemed to Project-related
activities.
Fifty-two 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.
