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 2 January to 31 December
2019 for the construction works.
The organisation
structure of the Project is presented in Figure 1.2.
Figure
1.2 Organisation
Chart
Contact details of the
key personnel are 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
|
Fredrick Leong
|
2859 1739
|
The programme of the construction
is shown in Annex A. As
informed by the Contractor, the major works carried out in this reporting period
include:
·
Site
entrance establishment;
·
Installation
of chain link fence;
· Construction of wheel
wash facilities;
·
Site
formation, site clearance and construction of perimeter bund for Cell 1X and 2X;
·
Site
formation works for the new infrastructure area;
· Excavating, removing
and replacing unsuitable fill material;
· Erection of site fencing;
· Plate load tests;
·
Site
clearance, excavation, rebar fixing, formwork, concreting and construction of
sediment trap, drop inlet shaft, MHX1 manhole and inlet and outlet box culverts;
· Initial site clearance
works, geotechnical review, utilities diversion erection of temporary
protection and application of initial shotcrete trial panel at buttress wall;
· Shotcreting of the
permanent works at buttress wall area and mass concrete for buttress wall;
· Advance screen
planting;
· DP4 channel improvement
works;
· Preparation of the
temporary surface water management, including construction of temporary
discharge monitoring points DP4 and DP6, shotcrete lining of the DP4 channel,
cut-off channel around SENTX and temporary drainage to DP4 and DP6 channels;
· Maintenance
and improvement of the temporary surface water drainage;
· Rebar fixing, formwork
and concreting for Leachate Treatment Plant (LTP) area, plinth and control
building;
· Construction of
superstructure of bioplant building;
· Installation of
groundwater pipe along eastern perimeter bund;
· CLP trench works at
Area X2;
· Rebar fixing,
concreting, formwork erection, building services and fitting-out works for control
building at Landfill Gas Plant area and placing of landfill gas generator;
· Road paving of Landfill
Gas Plant;
· Flares and cooling
towers installation;
·
Rebar,
formwork and concreting for the substructure of infrastructure buildings (EPD
building, GVL building and laboratory);
· Construction of X12
channel and X9B channel;
· Installation of ammonia
stripping plant, equalization tank, sequencing batch reactor tank and treated
effluent tank at LTP area;
· Backfilling
works around the raft foundation of maintenance building;
· Liner installation at
Cell 1X and Cell 2X; and
· Construction of pits
and ducting for underground utilities in Area X1 and X2.
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
|
Taking into account the
construction works, impact monitoring of air quality, noise, surface water quality
and waste management were carried out in the reporting period. The monitoring
schedule of air quality, noise and surface water quality monitoring are
provided in Annex C.
The EM&A programme
also involved environmental site inspections and related auditing conducted by
the ET for checking the implementation of the required environmental mitigation
measures recommended in the approved EIA Report and relevant EP submissions. To
promote the environmental awareness and enhance the environmental performance
of the contractors, environmental trainings and regular environmental
management meetings were conducted during the reporting period, which are
summarised as below:
Ÿ
Twelve
environmental management meetings were held with the Contractor, ER, ET, IEC
and EPD on 17 January, 14 February, 14 March, 11 April, 9 May, 13 June, 11
July, 21 August, 18 September, 16 October, 13 November and 19 December 2019;
and
Ÿ
Environmental
toolbox trainings on the following topics were provided by the Contractor to
the workers:
Ÿ
Dark
Smoke on 11 January 2019;
Ÿ
Air
Pollution Control (NRMM) (Emission) Regulation on 25 January 2019;
Ÿ
Illegal
Dumping on 13 February 2019;
Ÿ
Noise
Control Ordinance on 21 February 2019;
Ÿ
Waste
Water Management on 11 March 2019;
Ÿ
Vehicle
Maintenance Practices on 26 March 2019;
Ÿ
Mosquito
Control on 10 April 2019;
Ÿ
Recycling
Measures on 24 April 2019;
Ÿ
Chemical
Waste Handling on 15 May 2019;
Ÿ
Quality
Powered Mechanical Equipment on 28 May 2019;
Ÿ
Trip
Ticket System on 12 June 2019;
Ÿ
Green
Procurement on 24 June 2019;
Ÿ
Construction
Dust on 12 July 2019;
Ÿ
Air
Pollution Control (Non-road Mobile Machinery) (Emission) Regulation on 19 July
2019;
Ÿ
VOC
and Smog on 12 August 2019;
Ÿ
Illegal
Dumping on 26 August 2019;
Ÿ
Mosquito
Nuisance on 11 September 2019;
Ÿ
Persistent
Organic Pollutants on 23 September 2019;
Ÿ
Tree
Protection on 15 October 2019;
Ÿ
Renewable
Energy on 31 October 2019;
Ÿ
Waste
Reduction in Construction Industry on 7 November 2019;
Ÿ
Good
Practice of Wastewater Management in Construction Sites on 26 November 2019;
Ÿ
Chemical
Waste Handling on 10 December 2019; and
Ÿ
Vehicle
Maintenance Practices on 16 December 2019.
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: Chun Wo)
|
GW-RE1001-19
|
Validity from 16 December 2019 to 10 June 2020
|
|
GW-RE0695-19
|
Validity from 9 September 2019 to 3 March 2020 (cancelled
with effect from 16 December 2019 at 07:00 hrs)
|
|
GW-RE0404-19
|
Validity from 28 May 2019 to 22 November 2019 (cancelled
with effect from 9 September 2019 at 07:00 hrs)
|
|
GW-RE0259-19
|
Validity from 15 April 2019 to 8 October 2019 (cancelled
with effect from 28 May 2019 at 07:00 hrs)
|
|
GW-RE0002-19
|
Validity from 8 January 2019 to 1 July 2019 (cancelled
with effect from 15 April 2019 at 07:00 hrs)
|
|
Construction Noise Permit (Permit Holder: REC)
|
GW-RE0831-19
|
Validity from 17 October 2019 to 30 December 2019
|
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
2019
|
DM-1
|
110
|
79
– 146
|
204
|
260
|
|
|
DM-2
|
113
|
84
- 161
|
193
|
260
|
|
February
2019
|
DM-1
|
111
|
83
– 134
|
204
|
260
|
|
|
DM-2
|
116
|
82
- 160
|
193
|
260
|
|
March
2019
|
DM-1
|
88
|
67
– 107
|
204
|
260
|
|
|
DM-2
|
95
|
68
- 113
|
193
|
260
|
|
April
2019
|
DM-1
|
89
|
76
– 100
|
204
|
260
|
|
|
DM-2
|
77
|
70
- 91
|
193
|
260
|
|
May
2019
|
DM-1
|
92
|
73
- 105
|
204
|
260
|
|
|
DM-2
|
84
|
68-
103
|
193
|
260
|
|
June
2019
|
DM-1
|
82
|
63
- 109
|
204
|
260
|
|
|
DM-2
|
88
|
64
- 123
|
193
|
260
|
|
July
2019
|
DM-1
|
88
|
74
- 112
|
204
|
260
|
|
|
DM-2
|
93
|
82
– 111
|
193
|
260
|
|
August
2019
|
DM-1
|
71
|
55
- 85
|
204
|
260
|
|
|
DM-2
|
72
|
49
- 95
|
193
|
260
|
|
September
2019
|
DM-1
|
103
|
67
- 134
|
204
|
260
|
|
|
DM-2
|
108
|
79
- 146
|
193
|
260
|
|
October
2019
|
DM-1
|
91
|
80
- 102
|
204
|
260
|
|
DM-2
|
90
|
87
- 97
|
193
|
260
|
|
November
2019
|
DM-1
|
95
|
84
- 106
|
204
|
260
|
|
DM-2
|
100
|
88
- 106
|
193
|
260
|
|
December
2019
|
DM-1
|
108
|
92
- 116
|
204
|
260
|
|
DM-2
|
93
|
80
- 102
|
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: 2285762) (S/N:
2285722) (S/N: 2285690)
B&K 2250 (S/N: 3012330)
Acoustic Calibrator:
Quest QC-20 (S/N: QO9090006)
3M AC-300 (S/N:
AC300006213) (S/N: AC300005555)
Rion NC-75 (S/N: 34680623)
Rion NC-74 (S/N: 34657231)
(S/N: 34246492)
|
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 52 impact
noise monitoring events were scheduled during the reporting period. However, monitoring
was not conducted on 3 March, 8 and 23 May, 1 and 29 August and 5 December 2019
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
2019
|
NM1
|
52.0
|
48.9 – 53.6
|
75
|
|
February
2019
|
NM1
|
51.0
|
48.0 – 52.5
|
75
|
|
March
2019
|
NM1
|
52.2
|
51.1 – 53.1
|
75
|
|
April
2019
|
NM1
|
52.1
|
50.4 – 53.8
|
75
|
|
May
2019
|
NM1
|
52.8
|
51.6 – 54.6
|
75
|
|
June
2019
|
NM1
|
54.4
|
53.2 – 55.4
|
75
|
|
July
2019
|
NM1
|
54.0
|
52.0 – 56.1
|
75
|
|
August
2019
|
NM1
|
55.3
|
51.8 – 59.7
|
75
|
|
September
2019
|
NM1
|
52.6
|
51.0 – 54.8
|
75
|
|
October
2019
|
NM1
|
53.1
|
50.8 – 55.1
|
75
|
|
November
2019
|
NM1
|
54.0
|
52.1 – 57.0
|
75
|
|
December
2019
|
NM1
|
51.9
|
51.6 – 52.3
|
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
|
|
|
DP3
|
DP4
& DP6
|
DP3
|
DP4
& DP6
|
|
DO
|
<
5.13 mg/L
|
<
5.80 mg/L
|
<
4.35 mg/L
|
<
5.42 mg/L
|
|
SS
|
>
209.3 mg/L
|
>
11.7 mg/L
|
>
217.0 mg/L
|
>
12.7 mg/L
|
|
pH
|
>
8.88
|
>
8.39
|
>
9.28
|
>
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
|
|
DP3
|
Surface
water discharge point DP3
|
Weekly
|
•pH
•DO
•SS
|
YSI Professional Plus (S/N: HK1923829) (S/N:
JC024046)
YSI Professional DSS (S/N: 15H102620) (S/N:
17B102764) (S/N: 15H103928)
pH Meter AZ8685 (S/N: 1118396)
|
|
DP4 (Future, temporary)
|
Surface
water discharge point DP4
|
|
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 52
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 2019 at all
monitoring stations;
· February 2019 at all
monitoring stations;
· 8 March 2019 at DP6, 13
March 2019 at DP4 and DP6 and 22 and 28 March 2019 at all monitoring locations;
· April 2019 at all
monitoring stations;
· 8 and 16 May 2019 at
all monitoring locations;
· 14, 20 and 27 June 2019
at DP6;
· 4 July 2019 at DP6, 12
July 2019 at DP4 (Future, temporary) and DP6 and 18 July 2019 at DP6;
· 8 and 15 August 2019 at
DP4 (Future, temporary);
· 5 and 26 September 2019
at DP6 and 19 September 2019 at all monitoring stations;
· 3 October 2019 at DP6
and on 24 and 31 October 2019;
· November 2019 at all
monitoring stations; and
· December 2019 at all
monitoring stations.
Monitoring was cancelled
on 1 and 29 August 2019 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
|
|
8 March 2019
|
DP3
|
pH
|
Limit Level
|
Non Project-related
|
|
8 March 2019
|
DP3
|
SS
|
Limit Level
|
Non Project-related
|
|
8 March 2019
|
DP4
|
SS
|
Limit Level
|
Non Project-related
|
|
8 May 2019
|
DP6
|
pH
|
Limit Level
|
Non Project-related
|
|
8 May 2019
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
23 May 2019
|
DP3
|
pH
|
Limit Level
|
Non Project-related
|
|
23 May 2019
|
DP3
|
SS
|
Limit Level
|
Non Project-related
|
|
23 May 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Project-related
|
|
23 May 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Project-related
|
|
23 May 2019
|
DP6
|
pH
|
Limit Level
|
Non Project-related
|
|
23 May 2019
|
DP6
|
SS
|
Limit Level
|
Project-related
|
|
30 May 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
30 May 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
30 May 2019
|
DP6
|
pH
|
Limit Level
|
Non Project-related
|
|
30 May 2019
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
6 June 2019
|
DP4 (Future, temporary)
|
DO
|
Limit Level
|
Non Project-related
|
|
6 June 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
6 June 2019
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
14 June 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
20 June 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
20 June 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
27 June 2019
|
DP4 (Future, temporary)
|
DO
|
Limit Level
|
Non Project-related
|
|
27 June 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
27 June 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
4 July 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
4 July 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
18 July 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
18 July 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
25 July 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
25 July 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Project-related
|
|
8 August 2019
|
DP6
|
SS
|
Limit Level
|
Non Project-related
|
|
22 August 2019
|
DP4 (Future, temporary)
|
pH
|
Limit Level
|
Non Project-related
|
|
22 August 2019
|
DP4 (Future, temporary)
|
SS
|
Limit Level
|
Non Project-related
|
|
5
September 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
|
5
September 2019
|
DP4
(Future, temporary)
|
SS
|
Limit
Level
|
Non
Project-related
|
|
12
September 2019
|
DP4
(Future, temporary)
|
pH
|
Limit
Level
|
Non
Project-related
|
Based on the
investigation conducted for each of the monitoring event with potential Action
and Limit Levels exceedances with the Contractor, the ER and the IEC, there is
no evidence showing the exceedances were related to the Project, except the exceedances
of pH and SS at DP4 (Future, temporary) and exceedance of SS at DP6 on 23 May
2019 and exceedance of SS at DP4 (Future, temporary) on 25 July 2019 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 17 January, 13
February, 21 March, 18 April, 23 May, 20 June, 22 July, 21 August, 27 September,
25 October, 26 November and 30 December 2019 to monitor the
implementation of the landscape and visual mitigation measures during
construction phase.
All relevant
environmental mitigation measures listed in the approved EIA Report and the updated
EM&A Manual and their implementation status are summarised in Annex B.
2.4.2
Results
and Observations
The Contractor has
implemented environmental mitigation measures as stated in the approved EIA
Report and the EM&A Manual.
Regarding the landscape
and visual audit, the Contractor was reminded to 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:
· 3, 10, 17,
24 and 31 January 2019;
· 8, 14, 21
and 28 February 2019;
· 7, 14, 21
and 28 March 2019;
· 4, 11, 18
and 24 April 2019;
· 2, 9, 16, 23
and 30 May 2019;
· 6, 13, 20
and 27 June 2019;
· 5, 11, 18
and 25 July 2019;
· 1, 8, 15, 21
and 29 August 2019;
· 5, 12, 18
and 26 September 2019;
· 3, 10, 16,
24 and 31 October 2019;
· 7, 13, 21
and 28 November 2019; and
· 5, 12, 19,
24 and 31 December 2019.
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)
|
Inert
Construction Waste Re-used
(in ‘000m3)
|
Non-inert
Construction Waste (b)
(in ‘000m3)
|
Recyclable
Materials (c) (in ‘000kg)
|
Chemical
Wastes
(in ‘000kg)
|
|
Rock
|
Soil
|
|
January
2019
|
0.061
|
0
|
0
|
0
|
0
|
0
|
0
|
|
February
2019
|
0.008
|
0
|
0
|
0
|
0.005
|
0
|
0
|
|
March 2019
|
0.032
|
1482.09
|
0
|
0
|
0.006
|
0
|
0
|
|
April
2019
|
0.251
|
0
|
2194.24
|
0
|
0.023
|
0
|
0
|
|
May 2019
|
0.015
|
0
|
3897.15
|
0
|
0.019
|
0
|
0
|
|
June 2019
|
0.034
|
0
|
689.72
|
0
|
0.020
|
0
|
0
|
|
July 19
|
0.028
|
0
|
6889.13
|
0
|
0.049
|
0
|
0
|
|
August 19
|
0.014
|
0
|
17110.67
|
0
|
0.051
|
0
|
0
|
|
September
19
|
0.007
|
0
|
12560.05
|
0
|
0.048
|
0
|
0.09
|
|
October 19
|
0.064
|
0
|
10567.52
|
0
|
0.087
|
0
|
0
|
|
November
19
|
0.410
|
0
|
17130.00
|
0
|
0.077
|
0
|
0
|
|
December
19
|
0
|
0
|
4954.21
|
0
|
0.065
|
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) Non-inert
construction wastes include general refuse disposed at landfill. Density
assumption: 0.9 (t/m3) for general refuse.
(c) Recyclable materials
include metals, paper, cardboard, plastics and others.
|
2.7
Implementation Status
of Environmental Mitigation Measures
A summary of the
Environmental Mitigation Implementation Schedule is presented in Annex B. The necessary
mitigation measures were implemented properly for the Project.
The 24-hour TSP monitoring
results and construction noise monitoring results complied with the Action and
Limit Levels in the reporting period. 2 exceedances of the Limit Level for DO,
15 exceedances of the Limit Level for pH and 19 exceedances of the Limit Level
for Suspended Solids (SS) were recorded for surface water quality impact
monitoring in the reporting period. The exceedances were investigated and
considered non Project-related, except the pH and SS exceedances at DP4
(Future, temporary) and SS exceedance at DP6 on 23 May 2019 and SS exceedance
at DP4 (Future, temporary) on 25 July 2019 which were found deemed to
Project-related activities.
Cumulative statistics
on exceedances is provided in Annex
G1.
There
were no notification of summons or prosecution recorded in the reporting
period.
One environmental
complaint related to dust nuisance was received during the reporting period.
Investigation on the environmental complaint was conducted in accordance with
the complaint handling process as stated in the Updated EM&A Manual. The
implementation of the relevant mitigation measures recommended in the updated
EM&A Manual by the Contractor might suggest that the dust nuisance was
deemed to activities that are not related to the Project. Investigation report
of the complaint is presented in Annex
G2.
Statistics on
complaints, notifications of summons and successful prosecutions are summarised
in Annex G1.
3
Conclusion
and Recommendation
This Annual EM&A Review
Report presents
the findings of the EM&A activities undertaken during the period from 2
January to 31 December 2019 in accordance with the updated EM&A Manual and
the requirements of the Environmental Permit (EP-308/2008/B).
Air quality (24-hour
TSP), noise and water quality (DO, pH and SS) monitoring were carried out in
the reporting period. Results for air quality monitoring (24-hour TSP)
complied with the Action and Limit Levels in the reporting period. No Action
and Limit Levels exceedances were recorded for construction noise monitoring. 2 exceedances of the
Limit Level for DO, 15 exceedances of the Limit Level for pH and 19 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 DP4 (Future, temporary) and SS exceedance at DP6 on 23 May
2019 and SS exceedance at DP4 (Future, temporary) on 25 July 2019 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
notification of summons or prosecution recorded in the reporting period. One
environmental complaint related to dust nuisance was received during the
reporting period. Investigation on the environmental complaint was conducted
in accordance with the complaint handling process as stated in the Updated
EM&A Manual.
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.
