List of Appendices
Appendix A Project Organization for Environmental
Works
Appendix B Implementation Schedule of Environmental
Mitigation Measures (EMIS)
Appendix C Summary of Action and Limit Levels
Appendix D Impact Air Quality Monitoring Result in
Graphical Presentation
Appendix E Impact, Post Construction and
Operational Water Quality Monitoring Results in Graphical Presentation
Appendix F Event Action Plan
Appendix G Summary of Waste Flow Table
Appendix H Cumulative Statistics on Exceedances,
Complaints, Notifications of Summons and Successful Prosecutions
Executive
Summary
Under Contract No. HY/2012/08,
Dragages – Bouygues Joint Venture (DBJV) is commissioned by the Highways
Department (HyD) to undertake the design and construction of the Northern
Connection Sub-sea Tunnel Section of the Tuen Mun – Chek Lap Kok Link Project
(TM-CLK Link Project) while AECOM
Asia Company Limited was appointed by HyD as the Supervising Officer. For
implementation of the environmental monitoring and audit (EM&A) programme
under the Contract, ERM-Hong Kong, Limited (ERM) has been appointed as the
Environmental Team (ET) in accordance with Environmental Permit No.
EP-354/2009/A. Ramboll Hong Kong Limited was employed by HyD as the
Independent Environmental Checker (IEC) and Environmental Project Office
(ENPO). Subsequent applications
for variation of environmental permits (VEP), EP-354/2009/B,
EP-354/2009/C and EP-354/2009/D, were granted on 28 January 2014, 10
December 2014 and 13 March 2015, respectively.
The construction phase of the Contract
commenced on 1 November 2013. The impact monitoring of the EM&A programme,
including air quality, water quality, marine ecological monitoring and
environmental site inspections were commenced on 1 November 2013.
Termination proposal for
construction EM&A programme was approved by EPD on 19 March
2021. The construction phase EM&A programme of the
Contract has been terminated since 19 March 2021.
This
is the Final EM&A report presenting the EM&A works carried out during
the period from 1 November 2013 to 19 March 2021 for the Contract No.
HY/2012/08 Northern Connection Sub-sea Tunnel Section (the “Contract ”) in accordance with the Updated EM&A
Manual of the TM-CLK
Link Contract. As informed by the
Contractor, major activities undertaken during the course of this Contract included:
|
Construction Activities Undertaken
|
|
Land-based Works
|
|
Work Area – WA 23
·
Sorting
of rock material
|
|
Work Area – WA 18
· Site formation works
· Site office construction
· Completion of chain-link fence
· Site hoarding works
|
|
Work Area – N6
· CLP substation construction
· Pile cap construction
· Land bored piling
|
|
Portion N-A
· Construction of temporary access
· Diaphragm wall construction
· Excavation for north launching shaft
· Land bored piling works
· TBM platform construction
· Formwork and metal scaffolding works
· Delivery & assembly of TBM
· Land-based sheet piling works
· Box culvert extension
· Startup of TBM
· Construction of cross passage tympanum
· Phase 2 surcharge removal
· Preparation of stage 2 reclamation
· Bulk excavation
· Diaphragm wall construction
· RC structure
· Demolition of amenities and workshop
· ELS removal
· Road & drainage works
· Gantry crane removal
|
|
Portion N-B
· Vibro-compaction
· Surcharge set up
· TBM tunnel works
· Seawall inspection and remedial works
|
|
Portion N-C
· Vibro-compaction
· Surcharge set up
· Set up of slurry treatment plant
· Surcharge removal
· Diaphragm wall construction for Ventilation Shaft
· Excavation for ventilation shaft
· Construction of capping beam and base slab for Ventilation Shaft
· Installation of tower crane
· Modification and maintenance works for slurry
· TBM tunnel works
· Shaft structure and backfilling
· Construction of North Ventilation Building
|
|
TBM Tunnel
· Excavation of sub-sea tunnel
· Construction of cross passage tympanum
· Thrust frame removal
· Sub-sea tunnel gallery installation
· Slab construction of tunnel protection enhancement
· Corbel construction
· Cross passage lining installation
· Cross passage construction by pipe jacking
· Excavation of sub-sea tunnel
· OVHD construction
· Parapet wall installation
· Fireboard installation
· Construction of overhead ventilation ducts
· Construction of thermal barrier
· Construction of walkway corbel & cover
|
|
Portion S-A
· Deep band drain installation
· Dewatering deep well installation
· Jet grouting, CSM ground treatment and diaphragm wall
· Ground freezing works
· Bulk excavation
· Diaphragm wall construction
· RC structure
· ELS removal
· Diaphragm wall removal
· E&M platform installation
· Backfilling
· Road & drainage works
· C&C Tunnel RC structure
· Roofing system installation
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Portion S-B
· Road & drainage works
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Portion S-C
· Diaphragm wall construction
· ELS removal
· STP demolition
· Cut & cover tunnel RC structure
· Backfilling
· Water treatment facilities dismantling
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Northern Landfall
· UU installation
· Carpark formation
· Hard paving and footpath at Pump Sump Area
· Reinstatement and defect works for reinstatement at Box culvert
|
|
Southern Ventilation Building
· Installation of green roof system & chain fence
|
|
CLP Substation
· Demolition works and backfilling works of CLP substation
|
|
Marine-based Works
|
|
Portion N-A
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
·
Marine sheet piling for box
culvert extension
·
Box culvert extension
·
Removal of existing seawall and
temporary pontoon installation at River Trade Terminal (RTT)
·
Rock bund deposition for marine
sheet pipe remedial works
·
Installation of silt curtain
·
Band drain installation
·
Seawall construction and filling
works
|
|
Portion N-B
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
|
|
Portion N-C
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
·
TBM tunnel works
·
Seawall enhancement works
|
|
Portion S-B
·
Seawall modification works
|
|
Portion S-C
·
Jetty dismantling works
|
A
summary of monitoring and audit activities conducted during the course of this
Contract is listed below:
24-hour
TSP monitoring 807 sessions
1-hour
TSP monitoring 808 sessions
Impact
water quality monitoring 456 sessions
Impact
dolphin monitoring 158 sessions
Joint
environmental site inspection 380 sessions
Post-translocation
coral monitoring 4 sessions
Post-construction
water quality monitoring 12 sessions
Operational
phase water quality monitoring 9 sessions
Operational
phase dolphin monitoring 19 sessions
Breaches
of Action and Limit Levels for Air Quality
One
hundred and twenty two (122) Action Level and fifteen (15) Limit Level exceedances
of 1-hour
TSP, twelve (12) Action Level and four (4) Limit Level exceedances of 24-hour
TSP were recorded for air quality monitoring during the impact monitoring period.
Breaches
of Action and Limit Levels for Water Quality
Fifty-eight
(58) Action Level of Dissolved Oxygen (Surface and Middle), eighty-three (83)
Action Level and eighteen (18) Limit Level exceedances of Dissolved Oxygen
(Bottom), twenty-seven (27) Action Level and one (1) Limit Level exceedances of
Suspended Solids (SS) were recorded for water quality monitoring during the
impact monitoring period.
Dolphin
Monitoring
Eleven (11) Action Level and twenty
(20) Limit Level exceedances were recorded for impact dolphin monitoring during the impact monitoring period.
Three
(3) Limit Level exceedances were recorded for quarterly post-construction
(operational) dolphin monitoring data between June 2020 and March 2021.
Post-Translocation
Coral Monitoring
No exceedance of Action and Limit Levels was recorded for post-translocation
coral monitoring.
The results were detailed in the First to Fourth Quarterly Post- Translocation
Coral Monitoring Reports and were submitted under separate covers.
Environmental
Complaints, Non-compliance & Summons
Seventeen (17) environmental complaints and one (1)
notification of summons were recorded during
the impact monitoring period.
There was no successful
prosecution recorded.
1
Introduction
According
to the findings of the Northwest New Territories (NWNT) Traffic and
Infrastructure Review conducted by the Transport Department, Tuen Mun Road,
Ting Kau Bridge, Lantau Link and North Lantau Highway would be operating beyond
capacity after 2016. This forecast has been based on the estimated increase in
cross boundary traffic, developments in the Northwest New Territories (NWNT),
and possible developments in North Lantau, including the Airport developments,
the Lantau Logistics Park (LLP) and the Hong Kong – Zhuhai – Macao Bridge
(HZMB). In order to cope with the anticipated traffic demand, two new road
sections between NWNT and North Lantau – Tuen Mun – Chek Lap Kok Link (TM-CLKL)
and Tuen Mun Western Bypass (TMWB) are proposed.
An
Environmental Impact Assessment (EIA) of TM-CLKL (the Project) was prepared in
accordance with the EIA Study Brief (No. ESB-175/2007) and the Technical
Memorandum of the Environmental Impact Assessment Process (EIAO-TM).
The EIA Report was submitted under the Environmental Impact Assessment
Ordinance (EIAO) in August 2009. Subsequent to the approval of the EIA Report
(EIAO Register Number AEIAR-146/2009), an Environmental Permit (EP-354/2009)
for TM-CLKL was granted by the Director of Environmental Protection (DEP) on 4
November 2009, and EP variation (VEP) (EP-354/2009A) was issued on 8 December
2010. Subsequent applications for variation of environmental permits (VEP), EP-354/2009/B,
EP-354/2009/C and EP-354/2009/D, were granted on 28 January 2014, 10
December 2014 and 13 March 2015, respectively.
Under Contract No. HY/2012/08,
Dragages – Bouygues Joint Venture (DBJV) is commissioned by the Highways
Department (HyD) to undertake the design and construction of the Northern
Connection Sub-sea Tunnel Section of TM-CLKL while AECOM Asia Company Limited was appointed
by HyD as the Supervising Officer. For implementation of the environmental
monitoring and audit (EM&A) programme under the Contract, ERM-Hong Kong,
Limited (ERM) has been appointed as the Environmental Team (ET). Ramboll Hong
Kong Limited was
employed by HyD as the Independent Environmental Checker (IEC) and
Environmental Project Office (ENPO).
Layout of the Contract components is
presented in Figure 1.1.
The construction phase of the Contract
commenced on 1 November 2013. The impact monitoring phase of the EM&A
programme, including air quality, water quality, marine ecological monitoring
and environmental site inspections, were commenced on 1 November 2013.
Termination proposal for
construction EM&A programme was approved by EPD on 19 March
2021. The construction phase EM&A programme of the
Contract has been terminated since 19 March 2021.
1.2
Scope of This Report
This
is the Final EM&A Report under the Contract No. HY/2012/08 Northern
Connection Sub-sea Tunnel Section.
This report presents a summary of the environmental monitoring and audit works
from 1 November 2013 to 19 March 2021.
The
organization structure of the Contract is shown in Appendix A. The key
personnel contact names and contact details are summarized in Table 1.1
below.
Table 1.1 Contact Information of Key
Personnel
|
Party
|
Position
|
Name
|
Telephone
|
Fax
|
|
Highways
Department
|
Engr
24/SD
|
Ken
T.M. Cheng
|
2762 4062
|
3188 6614
|
|
SOR
(AECOM
Asia Company Limited)
|
Chief
Resident Engineer
|
Roger Man
|
2293 6388
|
2293 6300
|
|
ENPO
/ IEC
(Ramboll
Hong Kong Ltd.)
|
ENPO
Leader
|
Y.H.
Hui
|
3465 2850
|
3465
2899
|
|
IEC
|
Brian Tam
|
9700 6767
|
3465
2899
|
|
Contractor
(Dragages –
Bouygues Joint Venture)
|
Quality
and Environmental Manager
|
Erwin
Regalado
|
2507 1732
|
2293 7499
|
|
|
24-hour
hotline
|
|
2293 7330
|
|
|
ET
(ERM-HK)
|
ET
Leader
|
Jasmine
Ng
|
2271
3311
|
2723
5660
|
As informed by the Contractor, details
of the major works undertaken during the course of this Contract are listed
below:
|
Construction Activities Undertaken
|
|
Land-based Works
|
|
Work Area – WA 23
·
Sorting
of rock material
|
|
Work Area – WA 18
· Site formation works
· Site office construction
· Completion of chain-link fence
· Site hoarding works
|
|
Work Area – N6
· CLP substation construction
· Pile cap construction
· Land bored piling
|
|
Portion N-A
· Construction of temporary access
· Diaphragm wall construction
· Excavation for north launching shaft
· Land bored piling works
· TBM platform construction
· Formwork and metal scaffolding works
· Delivery & assembly of TBM
· Land-based sheet piling works
· Box culvert extension
· Startup of TBM
· Construction of cross passage tympanum
· Phase 2 surcharge removal
· Preparation of stage 2 reclamation
· Bulk excavation
· Diaphragm wall construction
· RC structure
· Demolition of amenities and workshop
· ELS removal
· Road & drainage works
· Gantry crane removal
|
|
Portion N-B
· Vibro-compaction
· Surcharge set up
· TBM tunnel works
· Seawall inspection and remedial works
|
|
Portion N-C
· Vibro-compaction
· Surcharge set up
· Set up of slurry treatment plant
· Surcharge removal
· Diaphragm wall construction for Ventilation Shaft
· Excavation for ventilation shaft
· Construction of capping beam and base slab for Ventilation Shaft
· Installation of tower crane
· Modification and maintenance works for slurry
· TBM tunnel works
· Shaft structure and backfilling
· Construction of North Ventilation Building
|
|
TBM Tunnel
· Excavation of sub-sea tunnel
· Construction of cross passage tympanum
· Thrust frame removal
· Sub-sea tunnel gallery installation
· Slab construction of tunnel protection enhancement
· Corbel construction
· Cross passage lining installation
· Cross passage construction by pipe jacking
· Excavation of sub-sea tunnel
· OVHD construction
· Parapet wall installation
· Fireboard installation
· Construction of overhead ventilation ducts
· Construction of thermal barrier
· Construction of walkway corbel & cover
|
|
Portion S-A
· Deep band drain installation
· Dewatering deep well installation
· Jet grouting, CSM ground treatment and diaphragm wall
· Ground freezing works
· Bulk excavation
· Diaphragm wall construction
· RC structure
· ELS removal
· Diaphragm wall removal
· E&M platform installation
· Backfilling
· Road & drainage works
· C&C Tunnel RC structure
· Roofing system installation
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Portion S-B
· Road & drainage works
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Portion S-C
· Diaphragm wall construction
· ELS removal
· STP demolition
· Cut & cover tunnel RC structure
· Backfilling
· Water treatment facilities dismantling
· UU installation
· Carpark formation
· Carpark canopies installation
|
|
Northern Landfall
· UU installation
· Carpark formation
· Hard paving and footpath at Pump Sump Area
· Reinstatement and defect works for reinstatement at Box culvert
|
|
Southern Ventilation Building
· Installation of green roof system & chain fence
|
|
CLP Substation
· Demolition works and backfilling works of CLP substation
|
|
Marine-based Works
|
|
Portion N-A
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
·
Marine sheet piling for box
culvert extension
·
Box culvert extension
·
Removal of existing seawall and
temporary pontoon installation at River Trade Terminal (RTT)
·
Rock bund deposition for marine
sheet pipe remedial works
·
Installation of silt curtain
·
Band drain installation
·
Seawall construction and filling
works
|
|
Portion N-B
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
|
|
Portion N-C
·
Dredging
·
Vertical and sloping seawall
construction
·
Reclamation filling
·
TBM tunnel works
·
Seawall enhancement works
|
|
Portion S-B
·
Seawall modification works
|
|
Portion S-C
·
Jetty dismantling works
|
The
Environmental Sensitive Receivers in the vicinity of the Project are shown in Figure 1.2.
The
environmental mitigation measures implementation schedule is presented in Appendix B.
1.5
Summary of EM&A Programme Requirements
The
EM&A programme required environmental monitoring for air quality, water
quality and marine ecology as well as environmental site inspections for air
quality, noise, water quality, waste management, marine ecology and landscape
and visual impacts. The EM&A requirements and related findings for each
component are described in the following sections, which include:
·
Monitoring
parameters;
·
Action and Limit levels
for all environmental parameters;
·
Event Action Plan;
·
Tested environmental
impact hypotheses;
·
Environmental
mitigation measures, as recommended in the approved EIA Report; and
·
Environmental
requirement in contract documents.
2
EM&A RESULTS
The
EM&A programme required environmental monitoring for air quality, water
quality and marine ecology as well as environmental site inspections for air
quality, noise, water quality, waste management, marine ecology and landscape
and visual impacts. The EM&A requirements and related findings for each
component are summarized in the following sections.
2.1.1
Monitoring
Requirements and Equipment
In
accordance with the Updated EM&A Manual and the Enhanced TSP Monitoring Plan (), impact 1-hour TSP monitoring was conducted three (3) times
in every six (6) days and impact 24-hour TSP monitoring was carried out once in
every six (6) days when the highest dust impact was expected. 1-hr and 24-hr
TSP monitoring frequency was increased to three times per day every three days
and daily every three days respectively as excavation works for launching shaft
commenced on 24 October 2014.
Excavation works for launching shaft
were completed and notification of change on air quality monitoring frequency
was submitted to EPD on 14 September 2020. 1-hr and 24-hr TSP monitoring
frequency was changed to three times per day every six days and daily every six
days, respectively, since 14 September 2020.
High volume samplers (HVSs) were used to carry out the 1-hour and
24-hour TSP monitoring in the reporting period at the five (5) air quality
monitoring stations in accordance with the requirements stipulated in the
Updated EM&A Manual
(Figure
2.1; Table 2.1). Wind
anemometer was installed at the rooftop of ASR5 for logging wind speed and wind
direction. Details of the equipment deployed are provided in Table 2.2.
Termination proposal for
construction EM&A programme was
approved by EPD on 19 March 2021. The construction phase
EM&A programme of the Contract has been
terminated since 19 March 2021.
Table 2.1 Locations of Impact Air Quality
Monitoring Stations and Monitoring Dates during
the Impact Monitoring Period
|
Monitoring Station
|
Location
|
Description
|
Parameters & Frequency
|
|
ASR1
|
Tuen
Mun Fireboat Station
|
Office
|
TSP
monitoring
Ÿ
1-hour
Total Suspended Particulates (1-hour TSP, µg/m3), 3 times in every
6 days
Ÿ
24-hour
Total Suspended Particulates (24-hour TSP, µg/m3), daily for
24-hour in every 6 days
Enhanced
TSP monitoring (commenced on 24 October 2014)
Ÿ
1-hour
Total Suspended Particulates (1-hour TSP, µg/m3), 3 times in every
3 days
Ÿ
24-hour
Total Suspended Particulates (24-hour TSP, µg/m3), daily for
24-hour in every 3 days
|
|
ASR5
|
Pillar
Point Fire Station
|
Office
|
|
AQMS1
|
Previous
River Trade Golf
|
Bare
ground
|
|
AQMS2/ASR6
|
Butterfly
Beach Laundry
|
Office
|
|
ASR10
|
Butterfly
Beach Park
|
Recreational
uses
|
Note:
(1) AQMS2
was relocated and HVS was re-installed at ASR6 (Butterfly Beach Laundry) on 17
January 2014. AQMS2 was then superseded by ASR6 for the impact air
quality monitoring. Impact air quality monitoring at ASR6 commenced
on 21 January 2014.
Table 2.2 Air Quality Monitoring Equipment
|
Equipment
|
Brand and Model
|
|
High Volume Sampler
(1-hour TSP and 24-hour TSP)
|
Tisch Environmental Mass Flow Controlled Total Suspended Particulate (TSP) High Volume Sampler (Model No. TE-5170)
|
|
Wind Meter
|
MetPak (Model: MetPak II
(S/N: 13130002)
Davis (Model: Weather Wizard III (S/N:
WE90911A30)
Davis (Model: Vantage Pro 2 (S/N:
AS160104014)
|
|
|
|
|
Wind Anemometer for calibration
|
Lutron (Model No. AM-4201)
|
2.1.2
Action & Limit
Levels
The
Action and Limit Levels of the air quality monitoring are provided in Appendix C.
2.1.3
Monitoring Schedule
for the Impact Monitoring Period
During
the period of impact monitoring, impact 1-hour TSP monitoring and impact 24-hour TSP
monitoring were carried out in accordance with the Updated EM&A Manual. The
schedules for air quality monitoring were reported in the First to Eighty-ninth Monthly EM&A Reports.
2.1.4
Results and
Observations
The
major dust sources during the impact monitoring period included construction
activities under the Contract and Contract
No. HY/2013/12 as
well as nearby traffic emissions and renovation works
undertaken by other contract.
A
total of 808 monitoring events for 1-hour TSP and 807 monitoring events for 24-hour
TSP were undertaken during the impact monitoring period.
Comparison of EM&A results
with baseline
monitoring and EIA predictions for 1-hour TSP and 24-hour TSP are summarized
in Tables 2.3 and 2.4 and
present graphically in Appendix
D. The detailed impact monitoring data and meteorological information were
reported in the First
to Eighty-ninth
Monthly EM&A
Reports.
Table 2.3 Summary of Average Levels of TSP
Level of Baseline Monitoring and the
Impact Monitoring Period (in µg/m3)
|
Monitoring Station
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov 2017
- Oct 2018
|
Nov
2018 - Oct 2019
|
Nov 2019 - Oct 2020
|
Nov 2020 -Mar 2021
|
|
|
|
ASR 1
(1-hr TSP)
|
125
|
178
|
140
|
112
|
137
|
138
|
126
|
131
|
160
|
|
|
ASR 1
(24-hr TSP)
|
128
|
101
|
84
|
73
|
83
|
89
|
85
|
83
|
109
|
|
|
ASR 5
(1-hr TSP)
|
138
|
194
|
162
|
135
|
160
|
167
|
151
|
155
|
179
|
|
|
ASR 5
(24-hr TSP)
|
167
|
106
|
91
|
79
|
81
|
100
|
91
|
91
|
108
|
|
|
AQMS 1
(1-hr TSP)
|
131
|
141
|
124
|
88
|
102
|
99
|
94
|
101
|
129
|
|
|
AQMS 1
(24-hr TSP)
|
127
|
86
|
78
|
60
|
60
|
64
|
58
|
61
|
81
|
|
|
AQMS 2/
ASR 6
(1-hr TSP)
|
135
|
163
|
130
|
109
|
131
|
123
|
110
|
113
|
155
|
|
|
AQMS 2/
ASR 6
(24-hr TSP)
|
166
|
94
|
77
|
67
|
70
|
77
|
69
|
68
|
106
|
|
|
ASR 10
(1-hr TSP)
|
134
|
121
|
88
|
78
|
86
|
87
|
69
|
69
|
103
|
|
|
ASR 10
(24-hr TSP)
|
129
|
72
|
64
|
58
|
57
|
59
|
50
|
48
|
73
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Table 2.4 Comparison of Impacts on Air
Quality (in μg/m³) between EIA Prediction, Baseline Monitoring and the Impact Monitoring Period (in µg/m3)
|
Monitoring Station
|
EIA
Predicted Maximum
|
Maximum Baseline Monitoring
|
|
Maximum
Impact Monitoring
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 - Oct 2019
|
|
Nov 2019 – Oct 2020
|
Nov 2020 –Mar 2021
|
|
|
ASR 1
(1-hr TSP)
|
195
|
182
|
474
|
404
|
283
|
545
|
584
|
646
|
|
747
|
887
|
|
|
ASR 1
(24-hr TSP)
|
148
|
173
|
249
|
162
|
125
|
220
|
328
|
237
|
|
207
|
244
|
|
|
ASR 5
(1-hr TSP)
|
235
|
211
|
559
|
346
|
293
|
456
|
455
|
425
|
|
534
|
472
|
|
|
ASR 5
(24-hr TSP)
|
133
|
249
|
258
|
151
|
138
|
163
|
279
|
196
|
|
196
|
176
|
|
|
AQMS 1
(1-hr TSP)
|
N/A
|
196
|
431
|
348
|
231
|
473
|
324
|
311
|
|
303
|
248
|
|
|
AQMS 1
(24-hr TSP)
|
N/A
|
211
|
228
|
155
|
112
|
160
|
207
|
127
|
|
131
|
141
|
|
|
AQMS 2/
ASR 6
(1-hr TSP)
|
226
|
226
|
425
|
309
|
279
|
401
|
335
|
478
|
|
1454
|
358
|
|
|
AQMS 2/
ASR 6
(24-hr TSP)
|
153
|
221
|
269
|
133
|
141
|
138
|
178
|
191
|
|
149
|
185
|
|
|
ASR 10
(1-hr TSP)
|
189
|
215
|
645
|
251
|
202
|
475
|
816
|
242
|
|
407
|
246
|
|
|
ASR 10
(24-hr TSP)
|
112
|
181
|
166
|
130
|
116
|
205
|
250
|
146
|
|
138
|
121
|
|
Maximum 1-hour TSP impact
monitoring levels at ASR1, ASR5, AQMS2/ASR6 and ASR10 and maximum 24-hour TSP
impact monitoring levels at ASR1, ASR5 and ASR10 were generally higher than
their corresponding EIA predicted maximum levels.
One hundred and twenty two (122) Action Level
and fifteen (15) Limit Level exceedances of 1-hour TSP, twelve (12) Action
Level and four (4) Limit Level exceedances of 24-hour TSP were recorded for air
quality monitoring during the impact monitoring period. Summary of the exceedances
is reported in Table 2.5. Actions were taken in
accordance with the Event Action Plan as presented in Appendix F. The
exceedances were considered not related to this Contract upon further
investigation. Detailed investigation reports on exceedances were presented
in First
to
Sixth, Thirteenth, Fourteenth, Forty-fifth to Fifty-fourth, Fifty-eighth
to Sixty-fifth, Sixty-seventh, Sixty-ninth, Seventy-first to
Seventy-fourth, Seventy-seventh, Seventy-eighth, Eightieth, Eighty-second to
Eighty-sixth and Eighty-eighth Monthly EM&A Reports.
Although
occasional exceedances were recorded at these stations during impact monitoring
period, they were not project-related upon investigation. It also
appeared that the construction activities of the Contract did not cause
significant impact on air quality with similar average TSP levels between the
baseline and impact monitoring. The EIA has concluded that no
adverse residual construction dust impacts will occur after implementation of
mitigation measures. Thus, the monitoring results are considered to
be in line with the EIA prediction.
With
the implementation of the monitoring programme for air quality and
environmental mitigation measures, the EM&A programme was considered adequate and effective
in monitoring and minimizing the potential environmental impacts from the
Contract.
Table 2.5 Summary of Action Level and
Limit Level Exceedance of 1-hour TSP and 24-hour TSP
|
Period
|
Station
|
Parameter
|
Number of Action Level Exceedance(s)
|
Number of Limit Level Exceedance(s)
|
|
November
2013
|
AQMS1
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
ASR10
|
1-hour TSP
|
-
|
1
|
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
December
2013
|
AQMS2/ASR6
|
1-hour
TSP
|
4
|
-
|
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
ASR10
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
3
|
1
|
|
AQMS2/ASR6
|
24-hour
TSP
|
-
|
1
|
|
ASR1
|
24-hour
TSP
|
2
|
-
|
|
ASR5
|
24-hour
TSP
|
2
|
-
|
|
January
2014
|
AQMS1
|
1-hour
TSP
|
1
|
-
|
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
3
|
-
|
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
AQMS1
|
24-hour
TSP
|
1
|
-
|
|
February
2014
|
AQMS1
|
1-hour
TSP
|
1
|
-
|
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
March
2014
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
April
2014
|
ASR10
|
1-hour
TSP
|
1
|
-
|
|
November
2014
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
December
2014
|
AQMS1
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
July
2017
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR10
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
August
2017
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
September
2017
|
AQMS1
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
2
|
1
|
|
ASR5
|
1-hour
TSP
|
3
|
-
|
|
October
2017
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
24-hour
TSP
|
1
|
-
|
|
November
2017
|
ASR10
|
1-hour
TSP
|
2
|
1
|
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
December
2017
|
ASR1
|
1-hour
TSP
|
4
|
-
|
|
ASR5
|
1-hour
TSP
|
3
|
-
|
|
ASR1
|
24-hour
TSP
|
1
|
1
|
|
ASR10
|
24-hour
TSP
|
1
|
-
|
|
ASR5
|
24-hour
TSP
|
-
|
2
|
|
January
2018
|
ASR5
|
1-hour
TSP
|
6
|
-
|
|
February
2018
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
March
2018
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
April
2018
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
August
2018
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
September
2018
|
ASR1
|
1-hour
TSP
|
2
|
1
|
|
October
2018
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
November
2018
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
ASR5
|
1-hour
TSP
|
3
|
-
|
|
December
2018
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
January
2019
|
ASR1
|
1-hour
TSP
|
1
|
1
|
|
ASR5
|
1-hour
TSP
|
4
|
-
|
|
February
2019
|
ASR1
|
24-hour
TSP
|
1
|
-
|
|
March
2019
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
May
2019
|
ASR1
|
1-hour
TSP
|
2
|
-
|
|
ASR1
|
24-hour
TSP
|
1
|
-
|
|
July
2019
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
-
|
1
|
|
ASR5
|
1-hour
TSP
|
1
|
|
|
September
2019
|
ASR1
|
1-hour
TSP
|
-
|
1
|
|
October
2019
|
ASR1
|
1-hour
TSP
|
3
|
-
|
|
November
2019
|
ASR1
|
1-hour
TSP
|
2
|
2
|
|
ASR5
|
1-hour
TSP
|
3
|
1
|
|
December
2019
|
ASR1
|
1-hour
TSP
|
1
|
1
|
|
ASR10
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
March
2020
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
April
2020
|
ASR1
|
1-hour
TSP
|
2
|
1
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
June
2020
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
August
2020
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
September
2020
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
1
|
|
October
2020
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
1-hour
TSP
|
1
|
-
|
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
November
2020
|
AQMS2/ASR6
|
1-hour
TSP
|
1
|
-
|
|
|
ASR1
|
1-hour
TSP
|
1
|
1
|
|
ASR5
|
1-hour
TSP
|
1
|
-
|
|
ASR1
|
24-hour
TSP
|
2
|
-
|
|
December 2020
|
ASR5
|
1-hour TSP
|
1
|
-
|
|
February
2021
|
ASR5
|
1-hour
TSP
|
2
|
-
|
|
|
|
|
|
|
The
baseline water quality monitoring undertaken by the Hong Kong – Zhuhai – Macao
Bridge Hong Kong Projects (HZMB) between 6 and 31 October 2011 included all
monitoring stations for the Project. Thus, the baseline monitoring results and
Action/Limit Levels presented in HZMB Baseline Monitoring Report ()
are adopted for this Project.
2.2.1
Monitoring
Requirements and Equipment
In accordance with the Updated
EM&A Manual, impact water quality monitoring was carried out three days per
week since November 2013 (Figure
2.2a; Table 2.6).
Phase I Reclamation works for
the Northern Landfall was substantially completed in December
2014. A proposal letter was sent to EPD on 21 May 2015 to seek
approval for the temporary suspension of water quality monitoring. Subsequently,
a letter from EPD on 5 June 2015 stated that they have no strong objection to
the temporary suspension of the water quality monitoring. Water
quality monitoring was suspended from 6 June 2015 effectively.
Marine works for Phase II
reclamation commenced on 27 December 2016 and substantially completed in the
end of May 2017. Water quality monitoring resumed on 27 December 2016 and was
suspended since 30 May 2017.
Seawall block installation for
Phase II reclamation commenced on 1 November 2017, impact water quality
monitoring was resumed on 1 November 2017.
Seawall enhancement works at
Northern Landfall has been completed on 31 December 2017 and water
quality monitoring was suspended since 31 December 2017.
Seawall Modification Works at
Portion S-B has commenced on 7 January 2019 and temporarily suspended after
January 2019 and thus impact marine water quality monitoring resumed on 2
January 2019 and was temporarily suspended after January 2019.
Seawall Modification Works at
Portion S-B commenced on 15 April 2019. Impact marine water quality monitoring
resumed on 15 April 2019. In accordance with the approved Environmental Review
Report dated 21 March 2018 for the Change in Design of Vertical Seawall to
Sloping Seawall on Southern Landfall, Updated Impact water quality monitoring
programme and water quality monitoring stations IS17, SR7 and IS(Mf)11
specified under the EM&A Manual for HZMB HKBCF project will be
adopted (Figure 2.2b; Table
2.6). Results of water quality monitoring between April 2019 and June
2019 were adopted from the published EM&A data of Contract No.
HY/2012/07 Tuen Mun-Chek Lap Kok Link – Southern Connection Viaduct Section.
The Jetty dismantling works
commenced on 2 July 2019 and was completed on 11 July 2019. Water quality
monitoring was carried out since 2 July 2019.
The Seawall modification works
commenced on 12 August 2019 and completed on 30 December 2019.
Water quality monitoring was suspended since 30 December 2019.
According to the Updated
EM&A Manual, a post-construction water quality monitoring shall be carried
out upon completion of all marine-based construction activities.
Post-construction water quality monitoring was undertaken three days per week
for at least 4 weeks in accordance with the Updated EM&A Manual.
The proposal for post-construction water quality monitoring was approved
by EPD on 5 March 2020. The post-construction water
quality monitoring was conducted between 17 March 2020 and 11 April 2020.
Locations of water quality monitoring stations presented in Figures 2.2a and 2.2b and
in Table 2.7.
According to the Updated
EM&A Manual, an operational phase water quality monitoring shall
be performed monthly during the first year of Project operation at all
designated monitoring stations including control stations. The
operational phase water quality monitoring shall be ceased after the
first year of operation of the Project subject to the first year
review. Operational phase water quality monitoring
commenced in June 2020. Locations of water quality monitoring
stations presented in Figure
2.2c and in Table 2.8.
Table 2.6 Locations of Impact Water
Quality Monitoring Stations and the Corresponding Monitoring Requirements
|
Station ID
|
Type
|
Coordinates
|
*Parameters, unit
|
Depth
|
Frequency
|
|
|
|
Easting
|
Northing
|
|
|
|
|
IS12
|
Impact Station
|
813218
|
823681
|
Ÿ Temperature(°C)
Ÿ pH(pH
unit)
Ÿ Turbidity
(NTU)
Ÿ Water
depth (m)
Ÿ Salinity
(ppt)
Ÿ DO
(mg/L and % of
saturation)
·
SS
(mg/L)
|
3
water depths: 1m
below
sea surface,
mid-depth
and 1m
above
sea bed. If the water depth is less than 3m, mid-depth sampling only. If
water depth less than 6m, mid-depth may be omitted.
|
Impact monitoring: 3 days per week, at mid-flood and
mid-ebb tides during the construction period of the Contract.
|
|
IS13
|
Impact
Station
|
813667
|
824325
|
|
IS14
|
Impact
Station
|
812592
|
824172
|
|
IS15
|
Impact
Station
|
813356
|
825008
|
|
CS4
|
Control
/ Far Field Station
|
810025
|
824004
|
|
CS6
|
Control
/ Far Field Station
|
817028
|
823992
|
|
SR8
|
Sensitive receiver (Gazettal beaches in Tuen Mun)
|
816306
|
825715
|
|
SR9
|
Sensitive receiver
(Butterfly Beach)
|
813601
|
825858
|
|
SR10A
|
Sensitive receiver
(Ma Wan FCZ)
|
823741
|
823495
|
|
IS(Mf)11
|
Impact Station (Close to HKBCF construction site) 8
|
813562
|
820716
|
|
|
|
|
IS17
|
Impact Station (Close to HKBCF construction site)
|
814539
|
820391
|
|
|
|
|
SR7
|
Sensitive receivers (Tai Mo Do)
|
814293
|
821431
|
|
|
|
|
IS(Mf)9
|
Impact Station (Close to HKBCF construction site)
|
813273
|
818850
|
|
|
|
|
IS(Mf)16
|
Impact Station (Close to HKBCF construction site)
|
814328
|
819497
|
|
|
|
|
IS8(N)
|
Impact Station (Close to HKBCF construction site)
|
814413
|
818570
|
|
|
|
|
SR4(N2)
|
Sensitive receiver (Tai Ho Inlet)
|
814688
|
817859
|
|
|
|
|
SR4a
|
Sensitive receiver
|
815247
|
818067
|
|
|
|
|
CS(Mf)3(N)
|
Control Station
|
808814
|
822355
|
|
|
|
|
CS(Mf)5
|
Control Station
|
817990
|
821129
|
|
|
|
|
|
|
|
|
|
|
|
|
*Notes:
In addition to the parameters presented monitoring
location/position, time, water depth, sampling depth, tidal stages, weather
conditions and any special phenomena or works underway nearby were also
recorded.
|
|
Water
Quality Monitoring Station CS(Mf)3 was relocated to CS(Mf)3(N) since 2 May
2017.
Water
Quality Monitoring Station SR4 was relocated to SR4(N) since 2 March 2018.
Water
Quality Monitoring Station SR4(N) was relocated to SR4(N2) since 12 June 2019
|
|
Water
Quality Monitoring Station IS8 was relocated to IS8(N) since 12 June 2019.
|
Table 2.7 Locations of Post-Construction
Water Quality Monitoring Stations and the Corresponding Monitoring Requirements
|
Station ID
|
Type
|
Coordinates
|
*Parameters, unit
|
Depth
|
Frequency
|
|
|
|
Easting
|
Northing
|
|
|
|
|
IS(Mf)11
|
Impact Station (Close to HKBCF construction site)
|
813562
|
820716
|
Ÿ Temperature(°C)
Ÿ pH(pH
unit)
Ÿ Turbidity
(NTU)
Ÿ Water
depth (m)
Ÿ Salinity
(ppt)
Ÿ DO
(mg/L and % of
saturation)
·
SS
(mg/L)
|
3
water depths: 1m
below
sea surface,
mid-depth
and 1m
above
sea bed. If the water depth is less than 3m, mid-depth sampling only. If
water depth less than 6m, mid-depth may be omitted.
|
Post construction monitoring: 3 days per week, at
mid-flood and mid-ebb tides for four weeks.
|
|
IS17
|
Impact
Station (Close to HKBCF construction site)
|
814539
|
820391
|
|
SR7
|
Sensitive
receivers (Tai Mo Do)
|
814293
|
821431
|
|
IS(Mf)9
|
Impact
Station (Close to HKBCF construction site)
|
813273
|
818850
|
|
IS(Mf)16
|
Impact
Station (Close to HKBCF construction site)
|
814328
|
819497
|
|
IS8(N)
|
Impact
Station (Close to HKBCF construction site)
|
814413
|
818570
|
|
SR4(N2)
|
Sensitive
receiver (Tai Ho Inlet)
|
814688
|
817996
|
|
|
SR4a
|
Sensitive
receiver
|
815247
|
818067
|
|
|
CS(Mf)3(N)
|
Control
Station
|
808814
|
822355
|
|
|
CS(Mf)5
|
Control
Station
|
817990
|
821129
|
|
|
IS12
|
Impact Station (Close to
TMCLKL construction site)
|
813218
|
823681
|
|
|
IS13
|
Impact Station (Close to
TMCLKL construction site)
|
813667
|
824325
|
|
|
|
IS14
|
Impact Station (Close to
TMCLK construction site)
|
812592
|
824172
|
|
|
|
IS15
|
Impact Station (Close to
TMCLK construction site)
|
813356
|
825008
|
|
|
|
SR8
|
Sensitive
receiver (Gazettal beaches in Tuen Mun)
|
816306
|
825715
|
|
|
|
SR9
|
Sensitive
receiver
(Butterfly Beach)
|
813601
|
825858
|
|
|
|
SR10A(N)
|
Sensitive
receiver
(Ma Wan FCZ)
|
823644
|
823484
|
|
|
|
CS4
|
Control
Station
|
810025
|
824004
|
|
|
|
CS6
|
Control
Station
|
817028
|
823992
|
|
|
|
*Notes:
In addition to the parameters presented monitoring
location/position, time, water depth, sampling depth, tidal stages, weather
conditions and any special phenomena or works underway nearby were also
recorded.
Water
Quality Monitoring Station CS(Mf)3 was relocated to CS(Mf)3(N) since 2 May
2017.
Water
Quality Monitoring Station SR4 was relocated to SR4(N) since 2 March 2018.
Water
Quality Monitoring Station SR4(N) was relocated to SR4(N2) since 12 June 2019
Water
Quality Monitoring Station IS8 was relocated to IS8(N) since 12 June 2019.
Water
Quality Monitoring Station SR10A was relocated to SR10A(N) since 5 March
2020.
|
|
|
|
|
|
|
|
|
Table 2.8 Locations of Operational Phase
Water Quality
Monitoring Stations and the Corresponding Monitoring Requirements
|
Station ID
|
Type
|
Coordinates
|
*Parameters, unit
|
Depth
|
Frequency
|
|
|
|
Easting
|
Northing
|
|
|
|
|
IS(Mf)11
|
Impact
Station (Close to HKBCF construction site)
|
813562
|
820716
|
Ÿ Temperature(°C)
Ÿ pH(pH
unit)
Ÿ Turbidity
(NTU)
Ÿ Water
depth (m)
Ÿ Salinity
(ppt)
Ÿ DO
(mg/L and % of
saturation)
·
SS
(mg/L)
|
3
water depths: 1m
below
sea surface,
mid-depth
and 1m
above
sea bed. If the water depth is less than 3m, mid-depth sampling only. If
water depth less than 6m, mid-depth may be omitted.
|
Monthly at each station, at mid-flood and mid-ebb tides
during the first year of Project
operation.
|
|
SR4(N2)
|
Sensitive
receiver
(Tai
Ho Inlet)
|
814688
|
817996
|
|
CS2(A)
|
Control
Station
|
805232
|
818606
|
|
CS(Mf)5
|
Control
Station
|
817990
|
821129
|
|
*Notes:
In addition to the parameters presented monitoring
location/position, time, water depth, sampling depth, tidal stages, weather
conditions and any special phenomena or works underway nearby were also
recorded.
With reference to the EM&A Report under Contract No.
HY/2011/03, water quality monitoring station SR3 was relocated to SR3(N)
since 1 September 2017.
With reference to the EM&A Report under Contract No.
HY/2011/03, water quality monitoring station SR4 was relocated to SR4(N)
since 1 January 2018.
With reference to the EM&A Report under Contract No.
HY/2011/03, water quality monitoring station SR4(N) was relocated to SR4(N2)
since 21 August 2019.
With reference to the EM&A Report under Contract No.
HY/2011/03, water quality monitoring station CS2 was relocated to CS2(A) since
23 August 2017.
|
Table 2.9 summarizes
the equipment used in the impact, post construction and operational phase water
quality monitoring programme.
Table 2.9 Water Quality Monitoring
Equipment
|
Equipment
|
Model
|
Qty.
|
|
Water
Sampler
|
Kahlsico
Water-Bottle Model 135DW 150
|
1
|
|
Dissolved
Oxygen Meter
|
YSI
Pro 2030
|
1
|
|
pH
Meter
|
HANNA
HI 8314
|
1
|
|
HANNA
HI 9125
|
1
|
|
Turbidity
Meter
|
HACH
2100Q
|
1
|
|
Monitoring
Position Equipment
|
“Magellan”
Handheld GPS Model explorist GC
|
4
|
|
DGPS Koden KGP913MK2
|
1
|
|
Multi-Parameters
|
YSI ProDss 18A104824
|
1
|
|
YSI ProDss 15M100005
|
1
|
|
YSI ProDss 0001C6A7
|
1
|
|
YSI ProDss 17H105557
|
1
|
|
YSI ProDss 17E100747
|
1
|
|
YSI ProDss 16H104234
|
1
|
|
YSI ProDss 16H104233
|
1
|
|
YSI ProDss 00019CB2
|
1
|
|
Positioning
Equipment
|
Furuno GP-170
|
1
|
|
Water
Depth Detector
|
Lowrance Mark 5x /
Garmin Striker 4
|
1
|
2.2.2
Action & Limit
Levels
The Action and Limit Levels of the water quality monitoring
are provided in Appendix C.
The Event and Action plan
is presented in Appendix F.
2.2.3
Monitoring Schedule
for the Monitoring Period
Impact, post-construction
and operational phase water quality monitoring were carried out in accordance with the
Updated EM&A Manual. The schedules for water quality
monitoring are reported in the First to Eighty-ninth Monthly EM&A Reports.
2.2.4
Results and
Observations
A
total of 456 monitoring events for impact water quality monitoring events, 12
monitoring events for post-construction water quality monitoring and 9
monitoring events for operational phase water quality monitoring were
undertaken during the course of the Contract. Results of operational phase
water quality monitoring between April and May 2021 were presented in Ninety to Ninety-first
Monthly
EM&A Reports under
Contract No. HY/2012/08.
Comparison
of EM&A results with baseline monitoring are summarized in Tables 2.10
to 2.14. The detailed water quality monitoring data were reported in
the First
to Eighty-ninth
Monthly EM&A
Reports and detailed statistical
analysis were represented in the First to Seventh Annual EM&A Reports.
Table 2.10 Summary of Averages Level of
Surface DO Level of Baseline, Impact and Post-construction Monitoring (in mg/L)
|
Monitoring Station
|
Tide
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
Post Construction Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 -Oct
2019
|
|
|
|
IS12
|
Mid-ebb
|
6.1
|
6.3
|
7.0
|
-
|
7.2
|
6.5
|
-
|
7.2
|
|
|
Mid-flood
|
6.1
|
6.4
|
7.1
|
-
|
7.3
|
6.6
|
-
|
7.1
|
|
|
IS13
|
Mid-ebb
|
6.1
|
6.3
|
7.0
|
-
|
7.2
|
6.5
|
-
|
7.1
|
|
|
Mid-flood
|
6.1
|
6.4
|
7.0
|
-
|
7.3
|
6.5
|
-
|
7.1
|
|
|
IS14
|
Mid-ebb
|
6.1
|
6.3
|
6.9
|
-
|
7.2
|
6.5
|
-
|
7.2
|
|
|
Mid-flood
|
6.1
|
6.4
|
7.0
|
-
|
7.3
|
6.5
|
-
|
7.1
|
|
|
IS15
|
Mid-ebb
|
6.1
|
6.3
|
6.9
|
-
|
7.2
|
6.5
|
-
|
7.1
|
|
|
Mid-flood
|
6.2
|
6.4
|
7.0
|
-
|
7.3
|
6.5
|
-
|
7.1
|
|
|
SR10A
|
Mid-ebb
|
6.0
|
6.4
|
6.9
|
-
|
7.3
|
6.4
|
-
|
6.9
|
|
|
Mid-flood
|
6.0
|
6.4
|
7.0
|
-
|
7.4
|
6.5
|
-
|
6.8
|
|
|
SR8
|
Mid-ebb
|
6.2
|
6.4
|
6.9
|
-
|
7.2
|
6.5
|
-
|
7.1
|
|
|
Mid-flood
|
6.2
|
6.4
|
7.0
|
-
|
7.3
|
6.6
|
-
|
7.1
|
|
|
SR9
|
Mid-ebb
|
6.0
|
6.3
|
6.9
|
-
|
7.2
|
6.5
|
-
|
7.2
|
|
|
Mid-flood
|
6.0
|
6.4
|
7.0
|
-
|
7.3
|
6.5
|
-
|
7.1
|
|
|
IS(Mf)11
|
Mid-ebb
|
6.5
|
-
|
-
|
-
|
-
|
-
|
6.6
|
7.0
|
|
|
Mid-flood
|
6.1
|
-
|
-
|
-
|
-
|
-
|
6.6
|
7.0
|
|
|
SR7
|
Mid-ebb
|
6.3
|
-
|
-
|
-
|
-
|
-
|
6.5
|
7.0
|
|
|
Mid-flood
|
6.0
|
-
|
-
|
-
|
-
|
-
|
6.5
|
7.0
|
|
|
IS17
|
Mid-ebb
|
6.4
|
-
|
-
|
-
|
-
|
-
|
6.5
|
6.9
|
|
|
Mid-flood
|
6.1
|
-
|
-
|
-
|
-
|
-
|
6.7
|
7.0
|
|
|
IS(Mf)16
|
Mid-ebb
|
6.3
|
-
|
-
|
-
|
-
|
-
|
6.6
|
6.9
|
|
|
Mid-flood
|
6.3
|
-
|
-
|
-
|
-
|
-
|
6.7
|
7.0
|
|
|
IS(Mf)9
|
Mid-ebb
|
6.6
|
-
|
-
|
-
|
-
|
-
|
6.9
|
7.1
|
|
|
Mid-flood
|
6.5
|
-
|
-
|
-
|
-
|
-
|
6.7
|
7.1
|
|
|
IS8(N)
|
Mid-ebb
|
6.4
|
-
|
-
|
-
|
-
|
-
|
6.7
|
7.0
|
|
|
Mid-flood
|
6.4
|
-
|
-
|
-
|
-
|
-
|
6.7
|
7.0
|
|
|
SR4(N2)
|
Mid-ebb
|
6.1
|
-
|
-
|
-
|
-
|
-
|
6.4
|
6.9
|
|
|
Mid-flood
|
6.3
|
-
|
-
|
-
|
-
|
-
|
6.7
|
6.9
|
|
|
SR4a
|
Mid-ebb
|
5.5
|
-
|
-
|
-
|
-
|
-
|
6.5
|
6.9
|
|
|
Mid-flood
|
5.5
|
-
|
-
|
-
|
-
|
-
|
6.7
|
6.9
|
|
Table 2.11 Summary of Averages Level of Middle
DO Level of Baseline, Impact and Post-construction Monitoring (in mg/L)
|
Monitoring Station
|
Tide
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
Post Construction Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 -Oct 2019
|
|
|
|
IS12
|
Mid-ebb
|
5.9
|
6.2
|
6.9
|
-
|
7.3
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
6.9
|
6.3
|
7.0
|
-
|
7.4
|
6.5
|
-
|
7.0
|
|
|
IS13
|
Mid-ebb
|
6.0
|
6.2
|
6.9
|
-
|
7.3
|
6.4
|
-
|
7.0
|
|
|
Mid-flood
|
6.0
|
6.3
|
7.0
|
-
|
7.4
|
6.5
|
-
|
7.1
|
|
|
IS14
|
Mid-ebb
|
6.0
|
6.2
|
6.9
|
-
|
7.2
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
5.9
|
6.2
|
6.9
|
-
|
7.3
|
6.4
|
-
|
7.0
|
|
|
IS15
|
Mid-ebb
|
6.0
|
6.2
|
6.9
|
-
|
7.3
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
6.1
|
6.2
|
6.9
|
-
|
7.4
|
6.5
|
-
|
7.0
|
|
|
SR10A
|
Mid-ebb
|
6.0
|
6.2
|
6.8
|
-
|
7.3
|
6.4
|
-
|
6.8
|
|
|
Mid-flood
|
5.9
|
6.3
|
6.9
|
-
|
7.4
|
6.5
|
-
|
6.7
|
|
|
IS(Mf)11
|
Mid-ebb
|
6.1
|
-
|
-
|
-
|
-
|
-
|
6.1
|
6.8
|
|
|
Mid-flood
|
5.9
|
-
|
-
|
-
|
-
|
-
|
6.1
|
6.8
|
|
|
IS17
|
Mid-ebb
|
6.0
|
-
|
-
|
-
|
-
|
-
|
6.1
|
6.7
|
|
|
Mid-flood
|
5.9
|
-
|
-
|
-
|
-
|
-
|
6.3
|
6.9
|
|
|
IS(Mf)16
|
Mid-ebb
|
6.3
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
Mid-flood
|
6.1
|
-
|
-
|
-
|
-
|
-
|
-
|
-
|
|
|
IS(Mf)9
|
Mid-ebb
|
-
|
-
|
-
|
-
|
-
|
-
|
7.1
|
6.6
|
|
|
Mid-flood
|
6.2
|
-
|
-
|
-
|
-
|
-
|
7.2
|
6.8
|
|
Table 2.12 Summary of Averages Level of Bottom
DO Level of Baseline, Impact and Post-construction Monitoring (in mg/L)
|
Monitoring Station
|
Tide
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
Post Construction Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 -Oct 2019
|
|
|
|
IS12
|
Mid-ebb
|
5.9
|
6.1
|
6.8
|
-
|
7.3
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
5.9
|
6.2
|
6.8
|
-
|
7.4
|
6.5
|
-
|
7.0
|
|
|
IS13
|
Mid-ebb
|
5.9
|
6.1
|
6.7
|
-
|
7.3
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
5.9
|
6.1
|
6.8
|
-
|
7.4
|
6.5
|
-
|
7.0
|
|
|
IS14
|
Mid-ebb
|
5.9
|
6.0
|
6.7
|
-
|
7.3
|
6.4
|
-
|
7.1
|
|
|
Mid-flood
|
5.9
|
6.1
|
6.8
|
-
|
7.4
|
6.4
|
-
|
7.0
|
|
|
IS15
|
Mid-ebb
|
5.9
|
6.0
|
6.7
|
-
|
7.3
|
6.5
|
-
|
7.1
|
|
|
Mid-flood
|
6.0
|
6.1
|
6.8
|
-
|
7.4
|
6.5
|
-
|
7.1
|
|
|
SR10A
|
Mid-ebb
|
5.7
|
6.1
|
6.7
|
-
|
7.3
|
6.4
|
-
|
6.8
|
|
|
Mid-flood
|
5.8
|
6.1
|
6.8
|
-
|
7.4
|
6.5
|
-
|
6.6
|
|
|
SR8
|
Mid-ebb
|
6.0
|
6.2
|
6.8
|
-
|
7.3
|
6.5
|
-
|
7.2
|
|
|
Mid-flood
|
5.8
|
6.2
|
6.8
|
-
|
7.4
|
6.6
|
-
|
7.1
|
|
|
SR9
|
Mid-ebb
|
5.8
|
6.1
|
6.8
|
-
|
7.3
|
6.5
|
-
|
7.2
|
|
|
Mid-flood
|
5.9
|
6.2
|
6.9
|
-
|
7.4
|
6.5
|
-
|
7.1
|
|
|
IS(Mf)11
|
Mid-ebb
|
5.9
|
-
|
-
|
-
|
-
|
-
|
5.8
|
6.8
|
|
|
Mid-flood
|
5.8
|
-
|
-
|
-
|
-
|
-
|
5.9
|
6.9
|
|
|
SR7
|
Mid-ebb
|
6.1
|
-
|
-
|
-
|
-
|
-
|
6.3
|
7.0
|
|
|
Mid-flood
|
5.9
|
-
|
-
|
-
|
-
|
-
|
6.3
|
6.9
|
|
|
IS17
|
Mid-ebb
|
5.7
|
-
|
-
|
-
|
-
|
-
|
5.9
|
6.8
|
|
|
Mid-flood
|
5.8
|
-
|
-
|
-
|
-
|
-
|
6.1
|
6.9
|
|
|
IS(Mf)16
|
Mid-ebb
|
5.9
|
-
|
-
|
-
|
-
|
-
|
6.1
|
6.9
|
|
|
Mid-flood
|
6.0
|
-
|
-
|
-
|
-
|
-
|
6.4
|
7.0
|
|
|
IS(Mf)9
|
Mid-ebb
|
6.6
|
-
|
-
|
-
|
-
|
-
|
6.6
|
7.1
|
|
|
Mid-flood
|
6.7
|
-
|
-
|
-
|
-
|
-
|
6.5
|
7.0
|
|
|
IS8(N)
|
Mid-ebb
|
6.2
|
-
|
-
|
-
|
-
|
-
|
6.4
|
7.0
|
|
|
Mid-flood
|
6.3
|
-
|
-
|
-
|
-
|
-
|
6.6
|
7.0
|
|
|
SR4(N2)
|
Mid-ebb
|
6.0
|
-
|
-
|
-
|
-
|
-
|
6.1
|
7.0
|
|
|
Mid-flood
|
6.2
|
-
|
-
|
-
|
-
|
-
|
6.5
|
6.9
|
|
|
SR4a
|
Mid-ebb
|
5.3
|
-
|
-
|
-
|
-
|
-
|
6.0
|
6.9
|
|
|
Mid-flood
|
5.2
|
-
|
-
|
-
|
-
|
-
|
6.3
|
6.9
|
|
Table 2.13 Summary of
Averages Level of Depth-Averaged Turbidity Level of Baseline, Impact and
Post-construction Monitoring
|
Monitoring Station
|
Tide
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
Post Construction Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 -Oct 2019
|
|
|
|
IS12
|
Mid-ebb
|
10.7
|
5.1
|
6.6
|
-
|
6.7
|
7.6
|
-
|
5.3
|
|
|
Mid-flood
|
9.8
|
5.1
|
6.5
|
-
|
6.6
|
8.5
|
-
|
5.5
|
|
|
IS13
|
Mid-ebb
|
9.2
|
5.1
|
6.6
|
-
|
6.7
|
9.6
|
-
|
5.6
|
|
|
Mid-flood
|
9.5
|
5.0
|
6.6
|
-
|
6.5
|
10.3
|
-
|
5.4
|
|
|
IS14
|
Mid-ebb
|
9.3
|
5.0
|
6.7
|
-
|
6.7
|
8.5
|
-
|
5.4
|
|
|
Mid-flood
|
9.4
|
5.0
|
6.6
|
-
|
6.6
|
11.6
|
-
|
5.6
|
|
|
IS15
|
Mid-ebb
|
9.8
|
5.1
|
6.7
|
-
|
6.7
|
6.0
|
-
|
5.3
|
|
|
Mid-flood
|
9.8
|
5.1
|
6.5
|
-
|
6.5
|
11.0
|
-
|
4.5
|
|
|
SR10A
|
Mid-ebb
|
7.1
|
4.9
|
6.5
|
-
|
6.6
|
6.3
|
-
|
3.5
|
|
|
Mid-flood
|
7.0
|
4.8
|
6.4
|
-
|
6.5
|
7.1
|
-
|
4.2
|
|
|
SR8
|
Mid-ebb
|
11.0
|
5.0
|
6.5
|
-
|
6.5
|
7.2
|
-
|
5.5
|
|
|
Mid-flood
|
10.1
|
5.0
|
6.4
|
-
|
6.4
|
7.9
|
-
|
5.0
|
|
|
SR9
|
Mid-ebb
|
7.2
|
4.9
|
6.6
|
-
|
6.6
|
6.3
|
-
|
5.0
|
|
|
Mid-flood
|
8.5
|
4.9
|
6.5
|
-
|
6.4
|
7.5
|
-
|
4.4
|
|
|
IS(Mf)11
|
Mid-ebb
|
10.7
|
-
|
-
|
-
|
-
|
-
|
5.9
|
6.4
|
|
|
Mid-flood
|
12.9
|
-
|
-
|
-
|
-
|
-
|
7.9
|
7.7
|
|
|
SR7
|
Mid-ebb
|
8.7
|
-
|
-
|
-
|
-
|
-
|
5.5
|
5.6
|
|
|
Mid-flood
|
11.7
|
-
|
-
|
-
|
-
|
-
|
7.3
|
7.2
|
|
|
IS17
|
Mid-ebb
|
9.8
|
-
|
-
|
-
|
-
|
-
|
5.9
|
8.0
|
|
|
Mid-flood
|
12.1
|
-
|
-
|
-
|
-
|
-
|
5.8
|
6.1
|
|
|
IS(Mf)16
|
Mid-ebb
|
8.9
|
-
|
-
|
-
|
-
|
-
|
6.8
|
7.2
|
|
|
Mid-flood
|
11.3
|
-
|
-
|
-
|
-
|
-
|
7.2
|
6.6
|
|
|
IS(Mf)9
|
Mid-ebb
|
8.2
|
-
|
-
|
-
|
-
|
-
|
6.0
|
6.0
|
|
|
Mid-flood
|
10.2
|
-
|
-
|
-
|
-
|
-
|
7.2
|
8.1
|
|
|
IS8(N)
|
Mid-ebb
|
8.4
|
-
|
-
|
-
|
-
|
-
|
7.4
|
9.2
|
|
|
Mid-flood
|
11.9
|
-
|
-
|
-
|
-
|
-
|
6.4
|
6.2
|
|
|
SR4(N2)
|
Mid-ebb
|
8.9
|
-
|
-
|
-
|
-
|
-
|
7.0
|
9.2
|
|
|
Mid-flood
|
10.3
|
-
|
-
|
-
|
-
|
-
|
6.0
|
6.8
|
|
|
SR4a
|
Mid-ebb
|
8.9
|
-
|
-
|
-
|
-
|
-
|
5.8
|
6.1
|
|
|
Mid-flood
|
7.8
|
-
|
-
|
-
|
-
|
-
|
5.8
|
6.1
|
|
Table 2.14 Summary of
Averages Level of Depth-Averaged SS Level of Baseline, Impact and
Post-construction Monitoring
|
Monitoring Station
|
Tide
|
Average Baseline Monitoring
|
Average Impact Monitoring
|
Post Construction Monitoring
|
|
|
Nov
2013 - Oct 2014
|
Nov
2014 - Oct 2015
|
Nov
2015 - Oct 2016
|
Nov
2016 - Oct 2017
|
Nov
2017 - Oct 2018
|
Nov
2018 -Oct 2019
|
|
|
|
IS12
|
Mid-ebb
|
9.2
|
5.3
|
7.7
|
-
|
9.1
|
10.3
|
-
|
5.1
|
|
|
Mid-flood
|
9.5
|
5.4
|
7.7
|
-
|
8.8
|
10.0
|
-
|
5.5
|
|
|
IS13
|
Mid-ebb
|
10.0
|
5.2
|
7.7
|
-
|
9.3
|
10.3
|
-
|
5.9
|
|
|
Mid-flood
|
10.5
|
5.2
|
7.7
|
-
|
9.0
|
12.1
|
-
|
5.5
|
|
|
IS14
|
Mid-ebb
|
10.4
|
5.3
|
7.8
|
-
|
8.4
|
8.6
|
-
|
4.9
|
|
|
Mid-flood
|
9.7
|
5.3
|
7.7
|
-
|
8.1
|
13.7
|
-
|
6.2
|
|
|
IS15
|
Mid-ebb
|
9.6
|
5.3
|
7.7
|
-
|
9.1
|
7.7
|
-
|
5.1
|
|
|
Mid-flood
|
11.0
|
5.4
|
7.6
|
-
|
9.0
|
13.4
|
-
|
4.7
|
|
|
SR10A
|
Mid-ebb
|
10.3
|
5.3
|
7.6
|
-
|
8.5
|
7.4
|
-
|
4.2
|
|
|
Mid-flood
|
10.2
|
5.2
|
7.5
|
-
|
8.3
|
9.8
|
-
|
4.8
|
|
|
SR8
|
Mid-ebb
|
10.1
|
5.2
|
7.6
|
-
|
8.4
|
8.5
|
-
|
5.4
|
|
|
Mid-flood
|
11.3
|
5.3
|
7.5
|
-
|
8.3
|
10.7
|
-
|
4.9
|
|
|
SR9
|
Mid-ebb
|
8.8
|
5.2
|
7.6
|
-
|
8.4
|
7.8
|
-
|
4.7
|
|
|
Mid-flood
|
9.9
|
5.3
|
7.5
|
-
|
8.2
|
10.0
|
-
|
4.6
|
|
|
IS(Mf)11
|
Mid-ebb
|
9.8
|
-
|
-
|
-
|
-
|
-
|
6.5
|
6.4
|
|
|
Mid-flood
|
10.3
|
-
|
-
|
-
|
-
|
-
|
8.1
|
7.9
|
|
|
SR7
|
Mid-ebb
|
11.4
|
-
|
-
|
-
|
-
|
-
|
6.2
|
6.2
|
|
|
Mid-flood
|
10.4
|
-
|
-
|
-
|
-
|
-
|
8.0
|
6.8
|
|
|
IS17
|
Mid-ebb
|
10.7
|
-
|
-
|
-
|
-
|
-
|
7.2
|
8.7
|
|
|
Mid-flood
|
11.7
|
-
|
-
|
-
|
-
|
-
|
7.0
|
7.4
|
|
|
IS(Mf)16
|
Mid-ebb
|
11.3
|
-
|
-
|
-
|
-
|
-
|
8.1
|
8.1
|
|
|
Mid-flood
|
10.4
|
-
|
-
|
-
|
-
|
-
|
8.2
|
7.4
|
|
|
IS(Mf)9
|
Mid-ebb
|
10.9
|
-
|
-
|
-
|
-
|
-
|
7.6
|
7.1
|
|
|
Mid-flood
|
14.7
|
-
|
-
|
-
|
-
|
-
|
8.3
|
8.4
|
|
|
IS8(N)
|
Mid-ebb
|
11.3
|
-
|
-
|
-
|
-
|
-
|
8.5
|
11.3
|
|
|
Mid-flood
|
13.5
|
-
|
-
|
-
|
-
|
-
|
7.7
|
7.0
|
|
|
SR4(N2)
|
Mid-ebb
|
11.1
|
-
|
-
|
-
|
-
|
-
|
7.4
|
9.9
|
|
|
Mid-flood
|
12.2
|
-
|
-
|
-
|
-
|
-
|
7.6
|
6.3
|
|
|
SR4a
|
Mid-ebb
|
9.1
|
-
|
-
|
-
|
-
|
-
|
6.9
|
6.9
|
|
|
Mid-flood
|
9.8
|
-
|
-
|
-
|
-
|
-
|
6.8
|
6.4
|
|
Fifty-eight
(58) Action Level of Dissolved Oxygen (Surface and Middle), eighty-three (83)
Action Level and eighteen (18) Limit Level exceedances of Dissolved Oxygen
(Bottom), twenty-seven (27) Action Level and one (1) Limit Level exceedances of
Suspended Solids (SS) were
recorded for water quality monitoring during the impact monitoring period.
Summary of the exceedances is reported in Table 2.15. Actions were taken in accordance with
the Event Action Plan as presented in Appendix
F. The exceedances were considered not related to this
Contract upon further investigation. Detailed investigation reports on
exceedances were presented in Second, Fifth, Forty-ninth, Fiftieth and Sixty-seventh to
Seventy-third Monthly EM&A Reports.
A total of 12 monitoring
events were undertaken for post-construction water
quality monitoring. Post-construction monitoring
results are presented graphically in Appendix E and
detailed post-construction water quality
monitoring data were reported in the Seventy-Seventh and Seventy-Eighth
Monthly EM&A Reports.
A total of 9 monitoring
events were undertaken for operational phase water quality
monitoring. Operational phase monitoring results are presented
graphically in Appendix E and detailed operational
phase water quality monitoring data were reported in the Eightieth to Eighty-Eighth
Monthly EM&A Reports
Table 2.15 Summary of Action Level and
Limit Level Exceedance of Water Quality Monitoring
|
Period
|
Station
|
Parameter
|
Number
of Action Level Exceedance(s)
|
Number
of Limit Level Exceedance(s)
|
|
December 2013
|
IS15
|
SS
|
1
|
-
|
|
SR8
|
SS
|
1
|
-
|
|
SR9
|
SS
|
1
|
-
|
|
IS15
|
SS
|
1
|
-
|
|
SR9
|
SS
|
1
|
-
|
|
March
2014
|
IS12
|
SS
|
-
|
1
|
|
IS14
|
SS
|
1
|
-
|
|
November 2017
|
IS12
|
SS
|
2
|
-
|
|
IS13
|
SS
|
2
|
-
|
|
SR8
|
SS
|
2
|
-
|
|
SR10A
|
SS
|
1
|
-
|
|
SR9
|
SS
|
1
|
-
|
|
IS14
|
SS
|
1
|
-
|
|
IS15
|
SS
|
1
|
-
|
|
December 2017
|
IS15
|
SS
|
2
|
-
|
|
SR10A
|
SS
|
1
|
-
|
|
IS14
|
SS
|
1
|
-
|
|
May 2019
|
IS8
|
SS
|
1
|
-
|
|
SR4(N)
|
SS
|
1
|
-
|
|
July 2019
|
IS(Mf)11
|
Surface
& Middle DO
|
4
|
-
|
|
IS(Mf)11
|
Bottom
DO
|
5
|
11
|
|
IS(Mf)16
|
Surface
& Middle DO
|
1
|
-
|
|
IS(Mf)16
|
Bottom
DO
|
4
|
1
|
|
IS(Mf)9
|
Bottom
DO
|
1
|
-
|
|
IS17
|
Surface
& Middle DO
|
3
|
-
|
|
IS17
|
Bottom
DO
|
11
|
1
|
|
IS8(N)
|
Bottom
DO
|
2
|
1
|
|
SR4(N2)
|
Surface
& Middle DO
|
1
|
-
|
|
SR4(N2)
|
Bottom
DO
|
7
|
-
|
|
SR4a
|
Surface
& Middle DO
|
1
|
-
|
|
SR4a
|
Bottom
DO
|
7
|
-
|
|
SR7
|
Surface
& Middle DO
|
2
|
-
|
|
SR7
|
Bottom
DO
|
3
|
-
|
|
August 2019
|
IS(Mf)11
|
Surface
& Middle DO
|
6
|
-
|
|
IS(Mf)11
|
Bottom
DO
|
7
|
3
|
|
IS(Mf)16
|
Surface
& Middle DO
|
2
|
-
|
|
IS(Mf)16
|
Bottom
DO
|
2
|
-
|
|
IS(Mf)9
|
Surface
& Middle DO
|
1
|
-
|
|
IS17
|
Surface
& Middle DO
|
6
|
-
|
|
IS17
|
Bottom
DO
|
7
|
-
|
|
IS8(N)
|
Surface
& Middle DO
|
2
|
-
|
|
IS8(N)
|
Bottom
DO
|
2
|
-
|
|
SR4(N2)
|
Surface
& Middle DO
|
4
|
-
|
|
SR4(N2)
|
Bottom
DO
|
1
|
1
|
|
SR4a
|
Surface
& Middle DO
|
3
|
-
|
|
SR4a
|
Bottom
DO
|
6
|
-
|
|
SR7
|
Surface
& Middle DO
|
2
|
-
|
|
SR7
|
Bottom
DO
|
3
|
-
|
|
SR7
|
SS
|
1
|
-
|
|
September 2019
|
IS(Mf)11
|
Surface
& Middle DO
|
4
|
-
|
|
IS(Mf)11
|
Bottom
DO
|
3
|
-
|
|
IS(Mf)16
|
Surface
& Middle DO
|
1
|
-
|
|
IS(Mf)9
|
Surface
& Middle DO
|
2
|
-
|
|
IS(Mf)9
|
SS
|
1
|
-
|
|
IS17
|
Surface
& Middle DO
|
5
|
-
|
|
IS17
|
Bottom
DO
|
6
|
-
|
|
IS8(N)
|
Surface
& Middle DO
|
2
|
-
|
|
SR4(N2)
|
Surface
& Middle DO
|
2
|
-
|
|
SR4(N2)
|
Bottom
DO
|
3
|
-
|
|
SR4a
|
Surface
& Middle DO
|
1
|
-
|
|
SR4a
|
Bottom
DO
|
2
|
-
|
|
SR7
|
Surface
& Middle DO
|
3
|
-
|
|
SR7
|
Bottom
DO
|
1
|
-
|
|
October 2019
|
SR7
|
SS
|
2
|
-
|
|
November 2019
|
IS(Mf)16
|
SS
|
1
|
-
|
In general,
DO, turbidity and suspended solids levels were varied across the impact
monitoring period and these variations were however not consistent throughout
the impact monitoring period.
According to the EIA
prediction, no SS exceedance was anticipated from this Project at the water
sensitive receivers nearby the vicinity of Contract (WSR 22a, WSR 22b and WSR
22c). Although exceedances on depth-averaged SS were recorded in the
impact monitoring period, the exceedances were considered not related to this
Contract upon further investigation. The impact monitoring results were
considered influenced by fluctuation of background regional water quality
instead of indicating any unacceptable impacts from this Contract.
During the post-construction
water quality monitoring, no non-compliance of the water quality limit for DO,
turbidity and suspended solids levels was recorded.
With
the implementation of the monitoring programme for water quality and
environmental mitigation measures, the EM&A programme was considered adequate and effective
in monitoring and minimizing the potential environmental impacts from the
Contract.
2.3.1
Monitoring Requirements
Impact dolphin monitoring is
required to be conducted by a qualified dolphin specialist team to evaluate
whether there have been any effects on the dolphins. In order to fulfil
the EM&A requirements and make good use of available resources, Contract No.
HY/2012/08 has taken over the responsibility for implementation of dolphin
monitoring from HZMB HKLR Contract No. HY/2011/03 since October 2019.
According to the EM&A
Manual, Operational Phase Monitoring on dolphin monitoring shall
be undertaken based upon the frequency of forty-eight, one-day survey
events at a frequency of 2 per month over a period of 24 months following
cessation of the construction. Post construction (operational) phase dolphin
monitoring commenced since June 2019.
2.3.2
Monitoring Equipment
Table
2.16 summarizes the
equipment used for the impact dolphin monitoring.
Table 2.16 Dolphin Monitoring Equipment
|
Equipment
|
Model
|
|
Global
Positioning System (GPS)
Camera
Laser
Binoculars
Marine
Binocular
Vessel
for Monitoring
|
Garmin
18X-PC
Geo
One Phottix
Nikon
D90 300m 2.8D fixed focus
Nikon
D90 20-300m zoom lens
Infinitor
LRF 1000
Bushell
7 x 50 marine binocular with compass and reticules
65 foot single engine motor vessel with
viewing platform 4.5m above water level
|
2.3.3
Monitoring
Parameter, Frequencies & Duration
Dolphin
monitoring should cover all transect lines in Northeast Lantau (NEL) and the
Northwest Lantau (NWL) survey areas twice per month throughout the entire
construction period. The monitoring data should be compatible with, and should
be made available for, long-term studies of small cetacean ecology in Hong
Kong. In order to provide a suitable long-term dataset for comparison,
identical methodology and line transects employed in baseline dolphin monitoring
was followed in the impact dolphin monitoring.
2.3.4
Monitoring Location
The
impact and operational phase dolphin monitoring were carried out in the NEL and
NWL along the line transect as depicted in Figure 2.3. The co-ordinates of all transect lines are
shown in Table 2.17 below.
Table 2.17 Impact and Operational Dolphin
Monitoring Line Transect Co-ordinates
|
Line
No.
|
Easting
|
Northing
|
Line
No.
|
Easting
|
Northing
|
|
1
|
Start
Point
|
804671
|
815456
|
13
|
Start
Point
|
816506
|
819480
|
|
1
|
End
Point
|
804671
|
831404
|
13
|
End
Point
|
816506
|
824859
|
|
2
|
Start
Point
|
805476
|
820800*
|
14
|
Start
Point
|
817537
|
820220
|
|
2
|
End
Point
|
805476
|
826654
|
14
|
End
Point
|
817537
|
824613
|
|
3
|
Start
Point
|
806464
|
821150*
|
15
|
Start
Point
|
818568
|
820735
|
|
3
|
End
Point
|
806464
|
822911
|
15
|
End
Point
|
818568
|
824433
|
|
4
|
Start
Point
|
807518
|
821500*
|
16
|
Start
Point
|
819532
|
821420
|
|
4
|
End
Point
|
807518
|
829230
|
16
|
End
Point
|
819532
|
824209
|
|
5
|
Start
Point
|
808504
|
821850*
|
17
|
Start
Point
|
820451
|
822125
|
|
5
|
End
Point
|
808504
|
828602
|
17
|
End
Point
|
820451
|
823671
|
|
6
|
Start
Point
|
809490
|
822150*
|
18
|
Start
Point
|
821504
|
822371
|
|
6
|
End
Point
|
809490
|
825352
|
18
|
End
Point
|
821504
|
823761
|
|
7
|
Start
Point
|
810499
|
822000*
|
19
|
Start
Point
|
822513
|
823268
|
|
7
|
End
Point
|
810499
|
824613
|
19
|
End
Point
|
822513
|
824321
|
|
8
|
Start
Point
|
811508
|
821123
|
20
|
Start
Point
|
823477
|
823402
|
|
8
|
End
Point
|
811508
|
824254
|
20
|
End
Point
|
823477
|
824613
|
|
9
|
Start
Point
|
812516
|
821303
|
21
|
Start
Point
|
805476
|
827081
|
|
9
|
End
Point
|
812516
|
824254
|
21
|
End
Point
|
805476
|
830562
|
|
10
|
Start
Point
|
813525
|
821176
|
22
|
Start
Point
|
806464
|
824033
|
|
10
|
End
Point
|
813525
|
824657
|
22
|
End
Point
|
806464
|
829598
|
|
11
|
Start
Point
|
814556
|
818853
|
23
|
Start
Point
|
814559
|
821739
|
|
11
|
End
Point
|
814556
|
820992
|
23
|
End
Point
|
814559
|
824768
|
|
12
|
Start
Point
|
815542
|
818807
|
24*
|
Start Point
|
805476*
|
815900*
|
|
12
|
End
Point
|
815542
|
824882
|
24*
|
End Point
|
805476*
|
819100*
|
Remarks:
The coordinates of several starting and ending points have been revised since
August 2017 due to the presence of a work zone to the north of the airport
platform with intense construction activities in association with the
construction of the third runway expansion for the Hong Kong International
Airport. Co-ordinates in red and marked with asterisk
are revised co-ordinates of transect line.
2.3.5
Action & Limit
Levels
The
Action and Limit levels of dolphin impact monitoring are shown in Appendix C. The Event
Action Plan is presented in Appendix F.
2.3.6
Monitoring Schedule
for the Monitoring Period
The
dolphin monitoring schedules for the monitoring period are provided in the First
to Eighty-ninth Monthly EM&A Reports.
2.3.7
Results &
Observations
A
total of 158 and 19 monitoring events for impact dolphin monitoring events and
operational phase dolphin monitoring were undertaken during the course of this
Contract, respectively. Results of the operational phase dolphin monitoring
between April 2021 and August 2021 were presented in Ninety to Ninety-fourth
Monthly
EM&A Reports under
Contract No. HY/2012/08. Results
of the operational phase dolphin monitoring between September 2021 and May 2022
were/will be presented in Monthly EM&A Reports under Agreement No. HMWSD 1/202(EP).
Summary
of the average encounter rates of Chinese White Dolphins in NEL and NWL survey
areas and comparison
of average dolphin group size
are shown in Tables 2.18 and 2.19.
Table 2.18 Average Dolphin Encounter Rates
|
|
Encounter rate (STG)
(no. of on-effort dolphin sightings per 100
km of survey effort)
|
Encounter rate (ANI) (no.
of dolphins from all on-effort sightings per 100 km of survey effort)
|
|
Northeast Lantau
|
Northwest Lantau
|
Northeast Lantau
|
Northwest Lantau
|
|
Impact Phase (2018-19)
|
0.00
|
1.42 ± 1.80
|
0.00
|
3.62 ± 4.93
|
|
Impact Phase (2017-18)
|
0.00
|
2.68 ± 3.04
|
0.00
|
9.02 ± 14.63
|
|
Impact Phase (2016-17)
|
0.00
|
2.35 ± 2.62
|
0.00
|
8.57 ± 11.05
|
|
Impact Phase (2015-16)
|
0.00
|
2.10 ± 1.83
|
0.00
|
8.54 ± 8.53
|
|
Impact Phase (2014-15)
|
0.11 ± 0.54
|
2.54 ± 2.49
|
0.11 ± 0.54
|
11.64 ± 14.04
|
|
Impact Phase (2013-14)
|
0.22 ± 0.74
|
6.93 ± 4.08
|
0.76 ± 2.59
|
26.31 ± 17.56
|
|
Transitional Phase (2012-13)
|
1.70 ± 2.26
|
7.68 ± 4.36
|
4.75 ± 7.61
|
27.51 ± 18.06
|
|
Baseline Phase (2011-12)
|
6.05 ± 5.04
|
7.75 ± 5.69
|
19.91 ± 21.30
|
29.57 ± 26.96
|
Comparison
of average daily dolphin encounter rates from six years of impact monitoring phases
(November 2013 – October 2019), transitional phase (November 2012 – October
2013) and baseline phase monitoring periods (February 2011 – January 2012). (± denotes the standard
deviation of the value)
Table 2.19 Comparison of Average Dolphin
Group Size
|
|
Average Dolphin Group Size
|
|
Overall
|
Northeast Lantau
|
Northwest Lantau
|
|
Impact Phase (2018-19)
|
2.52 ± 1.45
(n = 27)
|
0.00
|
2.52 ± 1.45
(n = 27)
|
|
Impact Phase (2017-18)
|
3.12 ± 2.86
(n = 42)
|
0.00
|
3.12 ± 2.86
(n = 42)
|
|
Impact Phase (2016-17)
|
3.51 ± 2.68
(n = 43)
|
0.00
|
3.51 ± 2.68
(n = 43)
|
|
Impact Phase (2015-16)
|
3.73 ± 3.14
(n = 45)
|
1.00 (n = 1)
|
3.80 ± 3.14
(n = 44)
|
|
Impact Phase (2014-15)
|
4.24 ± 3.15
(n = 54)
|
1.00 (n = 1)
|
4.30 ± 3.15
(n = 53)
|
|
Impact Phase (2013-14)
|
3.76 ± 2.57
(n = 136)
|
5.00 ± 2.71
(n = 4)
|
3.73 ± 2.57
(n = 132)
|
|
Transitional Phase (2012-13)
|
3.37 ± 2.98
(n = 186)
|
2.64 ± 2.38
(n = 22)
|
3.47 ± 3.05
(n = 164)
|
|
Baseline Phase (2011-12)
|
3.32 ± 2.86
(n = 288)
|
2.80 ± 2.35
(n = 79)
|
3.52 ± 3.01
(n = 209)
|
Comparison
of average dolphin group size from six years of impact monitoring phases
(November 2013 – October 2019), transitional phase (November 2012 – October 2013)
and baseline phase monitoring periods (February 2011 – January 2012). (±
denotes the standard deviation of the value)
Eleven (11) Action Level and twenty
(20) Limit Level exceedances were recorded for impact dolphin monitoring during the impact monitoring period. Three (3) Limit Level exceedances were
recorded for quarterly post-construction (operational) dolphin monitoring data
between June 2020 and March 2021. Detailed investigation reports on exceedances
were presented in First to Twenty-ninth Quarterly EM&A Reports.
According to the baseline
results of the approved EIA Report, the dolphin groups were largely sighted
near waters around Lung Kwu Chau and Sha
Chau. There was no dolphin sighted along the alignment of this
Contract. Dolphins are observed heavily utilized area around
Lung Kwu Chau and less frequently in the
North Lantau region where the works area of this Contract is
situated. The monitoring results in the impact monitoring period are
considered to be in line with the EIA predictions, and the review of monitoring
data suggested that no unacceptable impacts was noted from the marine works
under this Contract.
With
the implementation of the monitoring programme for dolphin monitoring, the
EM&A programme was considered adequate and effective in monitoring and
minimizing the potential environmental impacts from the Contract.
2.3.8
Marine Mammal
Exclusion Zone Monitoring
Daily 250 m marine mammal
exclusion zone monitoring was undertaken during the period of marine works
under this Contract. One sighting of the Indo-Pacific humpback
dolphin (i.e. Chinese White Dolphin) Sousa chinensis was
recorded on 20 February 2014 during the exclusion zone
monitoring. The dolphin group of three was sighted within the 250 m
marine mammal exclusion zone from a dredging barge sighting platform by the
marine mammal observer. The marine dredging work was subsequently
suspended until the observer has confirmed that the area is continuously
clear of dolphin for a period of 30 minutes. The Dolphin
Intrusion Report is presented in Appendix J of
the Forth Monthly EM&A Report.
Passive Acoustic Monitoring
(PAM) was also implemented for the detection of marine mammal when
dredging, reclamation or marine sheet piling works were carried out
outside the daylight hours under this Contract.
Four
(4) Post-Translocation Coral Monitoring Surveys were conducted on 17 January
2014, 16 April 2014, 24 July 2014 and 23 October 2014 and the results were
provided in the First to Fourth Quarterly Post-Translocation
Coral Monitoring Report. The
findings indicated that no Action or Limit Levels exceedances was recorded for
coral monitoring as increase in percentage of partial mortality was not
detected for both the tagged translocated and natural coral colonies when
comparing to the pre-translocation dataset.
2.5
EM&A Site Inspection
Site
inspections were carried out on weekly basis to monitor the implementation of
proper environmental pollution control and mitigation measures under the
Contract. A total of 380 site inspections were carried out in the impact
monitoring period. Key observations were summarized in the section of EM&A
Site Inspection in the First to Eighty-ninth Monthly EM&A Reports.
The Contractor has rectified all of the observations identified during
environmental site inspections in the impact monitoring period.
Wastes
generated during the impact monitoring period include construction wastes
(inert and non-inert), imported fill, recyclable materials, chemical waste and
marine sediments.
The summary of waste generation amount is presented in Appendix G.
Waste monitoring and audit
programme has been undertaken during the impact monitoring
period. Wastes arising from this Contract have been managed in
accordance with the recommendations in the EIA Report, the EM&A Manual, the
Waste Management Plan and other relevant statutory requirements.
A
summary of the environmental licenses and permits for this Contract is presented
in Table 2.20 below.
