Contract No. HY/2011/03
Hong Kong-Zhuhai-Macao Bridge Hong Kong Link
Road
Section between Scenic
Hill and Hong Kong Boundary Crossing Facilities
Quarterly EM&A Report
No. 44 (June to August 2023)
27 October 2023
Revision 0
Contents
Executive
Summary
1.4 Construction
Works Undertaken During the Reporting Period
2.1 Summary
of EM&A Requirements
3....... Environmental Monitoring
and Audit
3.1 Implementation of Environmental
Measures
3.2 Air Quality Monitoring Results
3.4 Water
Quality Monitoring Results
3.5 Dolphin Monitoring Results
3.6 Mudflat Monitoring Results
3.7 Solid and Liquid Waste Management
Status
3.8 Environmental Licenses and Permits
4....... Environmental Complaint and Non-compliance
4.2 Summary of Environmental Complaint,
Notification of Summons and Successful Prosecution
5....... Comments, Recommendations
and Conclusion
Figures
Figure 1.1 Location
of the Site
Figure 2.1 Environmental
Monitoring Stations
Figure 2.2 Transect
Line Layout in Northwest and Northeast Lantau Survey Areas
Appendices
Appendix
A Environmental
Management Structure
Appendix
B Construction
Programme
Appendix C Location of
Works Areas
Appendix
D Event
and Action Plan
Appendix E Implementation
Schedule of Environmental Mitigation Measures
Appendix
F Site
Audit Findings and Corrective Actions
Appendix G Air Quality Monitoring Data and
Graphical Plots
Appendix H Noise Monitoring Data and
Graphical Plots
Appendix I Water
Quality Monitoring Data and Graphical Plots
Appendix J Dolphin
Monitoring Results
Appendix L Summary
of Environmental Licenses and Permits
Executive Summary
The
Hong Kong-Zhuhai-Macao Bridge (HZMB) Hong Kong Link Road (HKLR) serves to
connect the HZMB Main Bridge at the Hong Kong Special Administrative Region
(HKSAR) Boundary and the HZMB Hong Kong Boundary Crossing Facilities (HKBCF)
located at the north eastern waters of the Hong Kong International Airport
(HKIA).
The
HKLR project has been separated into two contracts. They are Contract No.
HY/2011/03 Hong Kong-Zhuhai-Macao Bridge Hong Kong Link Road-Section between
Scenic Hill and Hong Kong Boundary Crossing Facilities (hereafter referred to
as the Contract) and Contract No. HY/2011/09 Hong Kong-Zhuhai-Macao Bridge Hong
Kong Link Road-Section between HKSAR Boundary and Scenic Hill.
China
State Construction Engineering (Hong Kong) Ltd. was awarded by Highways
Department as the Contractor to undertake the construction works of Contract
No. HY/2011/03. The main works of the Contract include land tunnel at Scenic
Hill, tunnel underneath Airport Road and Airport Express Line, reclamation and
tunnel to the east coast of the Airport Island, at-grade road connecting to the
HKBCF and highway works of the HKBCF within the Airport Island and in the
vicinity of the HKLR reclamation.
The Contract is part of the HKLR Project and HKBCF Project, these
projects are considered to be ¡§Designated Projects¡¨, under Schedule 2 of the
Environmental Impact Assessment (EIA) Ordinance (Cap 499) and EIA Reports
(Register No. AEIAR-144/2009 and AEIAR-145/2009) were prepared for the
Project. The current Environmental
Permit (EP) EP-352/2009/D for HKLR and EP-353/2009/K for HKBCF were issued on
22 December 2014 and 11 April 2016, respectively. These documents are available
through the EIA Ordinance Register. The construction phase of Contract was commenced on 17 October 2012.
BMT
Hong Kong Limited was appointed by the Contractor to implement the
Environmental Monitoring & Audit (EM&A) programme for the Contract in
accordance with the Updated EM&A Manual for HKLR (Version 1.0) and provided
environmental team services to the Contract until 31 July 2020.
This
is the forty-fourth Quarterly EM&A report for the Contract which summarizes
the monitoring results and audit findings of the EM&A programme during the
reporting period from 1 June 2023 to 31 Aug 2023.
Environmental
Monitoring and Audit Progress
The EM&A programme were undertaken in
accordance with the Updated EM&A Manual for HKLR (Version 1.0). A summary
of the monitoring activities during this reporting period is presented as
below:
Monitoring Activity |
Monitoring Date |
|||
Jun 2023 |
Jul 2023 |
Aug 2023 |
||
Air
Quality |
1-hr
TSP at AMS5 |
5,
9, 15, 21 and 27 |
3,
7, 13, 19, 25 and 31 |
4,
10, 16, 22, 28 and 31 |
1-hr
TSP at AMS6 |
Not
applicable.(see remark 1) |
Not
applicable.(see remark 1) |
Not
applicable.(see remark 1) |
|
24-hr
TSP at AMS5
|
2,
8, 14, 20, 28 and 30 |
6,
12, 18, 24 and 28 |
3,
9, 15, 21, 25 and 31 |
|
24-hr
TSP at AMS6 |
Not
applicable.(see remark 1) |
Not
applicable.(see remark 1) |
Not
applicable.(see remark 1) |
|
Noise |
5,
15, 21 and 27 |
3,
13, 19, 25 and 31 |
4, 10, 16, 22 and 28 |
|
Water Quality |
2,
5, 7, 9, 12, 14, 16, 19, 21, 23, 26, 28 and 30 |
3,
5, 7, 10, 12, 14, 19, 21, 24, 26, 28 and 31 |
2,
4, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28 and 30 |
|
Chinese
White Dolphin |
5,
6, 12, 19 and 20 |
5,
7, 25 and 26 |
7, 11, 14 and 24 |
|
Mudflat Monitoring
(Ecology) |
2,
3, 4 and 5 |
-
|
- |
|
Mudflat Monitoring (Sedimentation rate) |
30 |
- |
- |
|
Site Inspection |
6,
16, 20 and 30 |
6,
12, 18 and 27 |
4,
9, 15 and 25 |
Remarks:
1) The existing air quality monitoring
location AMS6 ¡V Dragonair / CNAC (Group)Building (HKIA) was handed over to
Airport Authority Hong Kong on 31 March 2021. 1-hr and 24-hr TSP monitoring at
AMS6 was temporarily suspended starting from 1 April 2021. A new alternative
air quality monitoring location is still under processing during the reporting
period.
2) The sedimentation rate monitoring
on 15 June 2023 was rescheduled to 30 June 2023 due to the bad weather
conditions.
3) 24-hr TSP monitoring at EM&A
Station AMS5 ¡V Ma Wan Chung Village on 26 June 2023 was rescheduled to 28 June
2023 due to malfunction of HVS at AMS5 on 26 June 2023.
4) No.8 Storm Signal was in force on
17 July 2023, the water quality monitoring were cancelled due to safety reasons
and no substitute monitoring will be conducted.
5) As Super Typhoon Saola was rather
close to Hong Kong on 1 September 2023, the local weather deteriorated, and
winds strengthened further. 1-hr TSP monitoring at AMS5 on 1 September 2023 was
rescheduled to 31 August 2023.
6)
As Super
Typhoon Saola was rather close to Hong Kong on 1
September 2023, the site inspection on 31 August 2023 was cancelled.
Breaches of Action and Limit Levels
A
summary of environmental exceedances for this reporting period is as follows:
Environmental Monitoring |
Parameters |
Action Level (AL) |
Limit Level (LL) |
Air Quality |
1-hr
TSP |
0 |
0 |
24-hr
TSP |
0 |
0 |
|
Noise |
Leq
(30 min) |
0 |
0 |
Water Quality |
Suspended
solids level (SS) |
0 |
0 |
Turbidity
level |
0 |
0 |
|
Dissolved
oxygen level (DO) |
0 |
0 |
|
Dolphin Monitoring |
Quarterly
Analysis (June 2023 to August 2023) |
0 |
1 |
The
Environmental Team investigated all exceedance and found that they was not
project related.
All investigation
report for exceedance of the Contract has been submitted to ENPO/IEC for
comments and/or follow up to identify whether the exceedances occurred related
to other HZMB contracts.
Implementation of Mitigation Measures
Site
inspections were carried out to monitor the implementation of proper
environmental pollution control and mitigation measures for the Project.
Potential environmental impacts due to the construction activities were
monitored and reviewed.
Complaint Log
There was no complaints received in relation to the
environmental impacts during this reporting period.
Notifications of Summons and Prosecutions
There were no notifications of summons or
prosecutions received during this reporting period.
Reporting Changes
This report has been developed in compliance with
the reporting requirements for the subsequent EM&A reports as required by
the Updated EM&A Manual for HKLR (Version 1.0).
The
proposal for the change of Action Level and Limit Level for suspended solid and
turbidity was approved by EPD on 25 March 2013.
The
revised Event and Action Plan for dolphin monitoring was
approved by
EPD on 6 May 2013.
The
original monitoring station at IS(Mf)9 (Coordinate: 813273E, 818850N) was
observed inside the perimeter silt curtain of Contract HY/2010/02 on 1 July
2013, as such the original impact water quality monitoring location at IS(Mf)9
was temporarily shifted outside the silt curtain. As advised by the Contractor of HY/2010/02 in
August 2013, the perimeter silt curtain was shifted to facilitate safe
anchorage zone of construction barges/vessels until end of 2013 subject to
construction progress. Therefore,
water quality monitoring station IS(Mf)9 was shifted to 813226E and 818708N
since 1 July 2013. According to the
water quality monitoring team¡¦s observation on 24 March 2014, the original
monitoring location of IS(Mf)9 was no longer enclosed by the perimeter silt
curtain of Contract HY/2010/02. Thus, the impact water quality monitoring works
at the original monitoring location of IS(Mf)9 has been resumed since 24 March
2014.
Transect
lines 1, 2, 7, 8, 9 and 11 for dolphin monitoring have been revised due to the
obstruction of the permanent structures associated with the construction works
of HKLR and the southern viaduct of TM-CLKL, as well as provision of adequate
buffer distance from the Airport Restricted Areas. The EPD issued a memo and confirmed that
they had no objection on the revised transect lines on 19 August 2015.
The
water quality monitoring stations at IS10 (Coordinate: 812577E, 820670N) and
SR5 (811489E, 820455N) are located inside Hong Kong International Airport
(HKIA) Approach Restricted Areas. The previously granted Vessel's Entry Permit
for accessing stations IS10 and SR5 were expired on 31 December 2016. During
the permit renewing process, the water quality monitoring location was shifted
to IS10(N) (Coordinate: 813060E, 820540N) and SR5(N) (Coordinate: 811430E,
820978N) on 2, 4 and 6 January 2017 temporarily. The permit has been granted by
Marine Department on 6 January 2017. Thus, the impact water quality monitoring
works at original monitoring location of IS10 and SR5 has been resumed since 9
January 2017.
Transect
lines 2, 3, 4, 5, 6 and 7 for dolphin monitoring have been revised and transect
line 24 has been added 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. The EPD issued a memo and confirmed that they had no objection on the
revised transect lines on 28 July 2017. The alternative dolphin transect lines
are adopted starting from August¡¦s dolphin monitoring.
A
new water quality monitoring team has been employed for carrying out water
quality monitoring work for the Contract starting from 23 August 2017. Due to
marine work of the Expansion of Hong Kong International Airport into a
Three-Runway System (3RS Project), original locations of water quality
monitoring stations CS2, SR5 and IS10 are enclosed by works boundary of 3RS
Project. Alternative impact water quality monitoring stations, naming as
CS2(A), SR5(N) and IS10(N) was approved on 28 July 2017 and were adopted
starting from 23 August 2017 to replace the original locations of water quality
monitoring for the Contract.
The
role and responsibilities as the ET Leader of the Contract was temporarily
taken up by Mr Willie Wong instead of Ms Claudine Lee from 25 September 2017 to
31 December 2017.
The
topographical condition of the water monitoring stations SR3 (Coordinate:
810525E, 816456N), SR4 (Coordinate: 814760E, 817867N), SR10A (Coordinate:
823741E, 823495N) and SR10B (Coordinate: 823686E, 823213N) cannot be accessed
safely for undertaking water quality monitoring. The water quality monitoring
has been temporarily conducted at alternative stations, namely SR3(N) (Coordinate 810689E, 816591N), SR4(N) (Coordinate:
814705E, 817859N) and SR10A(N) (Coordinate: 823644E, 823484N) since 1 September
2017. The water quality monitoring at station SR10B was temporarily conducted
at Coordinate: 823683E, 823187N on 1, 4, 6, 8 September 2017 and has been
temporarily fine-tuned to alternative station SR10B(N2) (Coordinate: 823689E,
823159N) since 11 September 2017. Proposal for permanently relocating the
aforementioned stations was approved by EPD on 8 January 2018.
The works area WA5
was handed over to other party on 22 June 2013.
According to latest
information received in July 2018, the works area WA7 was handed over to other
party on 28 February 2018 instead of 31 January 2018.
Original WQM stations
IS8 and SR4(N) are located within the active work area of TCNTE project and the
access to the WQM stations IS8 (Coordinate: E814251, N818412) and SR4(N)
(Coordinate: E814705, N817859) are blocked by the silt curtains of the Tung
Chung New Town Extension (TCNTE) project. Alternative monitoring stations
IS8(N) (Coordinate: E814413, N818570) and SR4(N2) (Coordinate: E814688,
N817996) are proposed to replace the original monitoring stations IS8 and
SR4(N). Proposal for permanently relocating the aforementioned stations was
approved by EPD on 20 August 2019. The water quality
monitoring has been conducted at stations IS8(N) and SR4(N2) on 21 August 2019.
There were no marine works conducted by Contract
No. HY/2011/03 since July 2019. A proposal for temporary suspension of marine
related environmental monitoring (water quality monitoring and dolphin
monitoring for the Contract No. HY/2011/03) was justified by the ET leader and
verified by IEC in mid of September 2019 and it was approved by EPD on 24
September 2019. Water quality monitoring and dolphin monitoring for the
Contract will not be conducted starting from 1 October 2019 until marine works
(i.e. toe loading removal works) be resumed. As discussed with Contract No.
HY/2012/08, they will take up the responsibility from Contract No. HY/2011/03
for the dolphin monitoring works starting from 1 October 2019.
According to
information received in January 2020, the works area WA3 and WA4 were handed
over to Highways Department on 23 December 2019 and 14 March 2019 respectively.
The role and responsibilities as the
IEC of the Contract has been taken up by Mr. Manson Yeung instead of Mr. Ray
Yan since 18 May 2020.
Mr. Leslie Leung was
Environmental Team Leader of the Contract for July 2020. The role and
responsibilities as the Environmental Team Leader of the Contract has been
taken up by Ms. Claudine Lee with effective from 1 August 2020.
The existing air
quality monitoring location AMS6 ¡V Dragonair / CNAC (Group) Building (HKIA) was
handed over to Airport Authority Hong Kong on 31 March 2021. 1-hr and 24-hr TSP
monitoring at AMS6 was temporarily suspended starting from 1 April 2021. A new
alternative air quality monitoring location is still under processing.
The role and
responsibilities as the IEC of the Contract has been taken up by Mr Brian Tam
instead of Mr Manson Yeung since 12 April 2021.
The role and
responsibilities as the IEC of the Contract has been taken up by Mr Adi Lee
instead of Mr Brian Tam since 3 May 2022.
The role and
responsibilities as the IEC of the Contract has been taken up by Mr Brian Tam
instead of Mr Adi Lee since 25 July 2022.
The role and
responsibilities as the ENPO Leader of the Contract has been taken up by Mr
Louis Kwan from ANewR Consulting Limited instead of Mr H.Y. Hui from Ramboll
Hong Kong Limited Since 1 October 2022.
The role and
responsibilities as the IEC of the Contract has been taken up by Mr James Choi
from ANewR Consulting Limited instead of Mr Brian Tam from Ramboll Hong Kong
Limited since 1 October 2022.
Table 1.1 Construction
Activities during Reporting Period
Description of Activities |
Site Area |
Landscape
maintenance works |
SHT East Portal |
Removal
of Temporary Toe Loading Platform |
Portion X |
Table 2.1 Summary
of Impact EM&A Requirements
Environmental
Monitoring |
Description |
Monitoring
Station |
Frequencies |
Remarks |
Air Quality |
1-hr TSP |
AMS 5 & AMS
6 |
At least 3 times every 6 days |
While the
highest dust impact was expected. |
24-hr TSP |
At least once every 6 days |
-- |
||
Noise |
Leq (30mins), |
NMS 5 |
At least once per week |
Daytime on normal weekdays
(0700-1900 hrs). |
Water Quality |
¡P Depth ¡P Temperature
¡P Salinity ¡P Dissolved
Oxygen (DO) ¡P Suspended
Solids (SS) ¡P DO
Saturation ¡P Turbidity ¡P pH |
¡P Impact
Stations: ¡P Control/Far
Field Stations: ¡P Sensitive
Receiver Stations: |
Three times per week
during mid-ebb and mid-flood tides (within ¡Ó 1.75 hour of the predicted time) |
3 (1 m below water surface,
mid-depth and 1 m above sea bed, except where the water depth is less than 6
m, in which case the mid-depth station may be omitted. Should the water depth be less than 3
m, only the mid-depth station will be monitored). |
Dolphin
|
Line-transect Methods |
Northeast Lantau survey
area and Northwest Lantau survey area |
Twice
per month |
-- |
Mudflat |
Horseshoe crabs, seagrass beds, intertidal soft shore communities,
sedimentation rates and water quality |
San Tau and Tung Chung Bay |
Once every 3 months |
-- |
Remarks:
1) Original WQM stations IS8 and SR4(N) are
located within the active work area of TCNTE project and the access to the WQM
stations IS8 (Coordinate: E814251, N818412) and SR4(N) (Coordinate: E814705,
N817859) are blocked by the silt curtains of the Tung Chung New Town Extension
(TCNTE) project. Alternative monitoring stations IS8(N) (Coordinate: E814413,
N818570) and SR4(N2) (Coordinate: E814688, N817996) are proposed to replace the
original monitoring stations IS8 and SR4(N). Proposal for permanently
relocating the aforementioned stations was approved by EPD on 20 August 2019.
The water quality monitoring has been conducted at stations IS8(N) and SR4(N2)
on 21 August 2019.
2) The access to the WQM station SR4(N2)
(Coordinate: E814688, N817996) is being blocked by the silt curtains of the
Tung Chung New Town Extension (TCNTE) project. Water quality monitoring has
been temporarily conducted at alternative stations, namely SR4(N3) (Coordinate:
E814779, N818032) until 1 March 2023. Proposal for permanently relocating the
SR4(N2) was approved by EPD on 3 March 2023. The water quality monitoring has
been conducted at stations SR4(N3) since 3 March 2023.
Table 2.2 Action and
Limit Levels for 1-hour TSP, 24-hour
TSP and Noise
Environmental Monitoring |
Parameters |
Monitoring Station |
Action Level |
Limit Level |
Air
Quality |
1-hr
TSP |
AMS
5 |
352 µg/m3 |
500 µg/m3 |
AMS
6 |
360 µg/m3 |
|||
24-hr
TSP |
AMS
5 |
164 µg/m3 |
260 µg/m3 |
|
AMS
6 |
173 µg/m3 |
|||
Noise |
Leq
(30 min) |
NMS 5 |
When
one documented complaint is received |
75
dB(A) |
Table 2.3 Action
and Limit Levels for Water Quality
Parameter
(unit) |
Water Depth |
Action
Level |
Limit Level |
Dissolved Oxygen (mg/L) |
Surface and Middle |
5.0 |
4.2 except 5 for Fish
Culture Zone |
Bottom |
4.7 |
3.6 |
|
Turbidity (NTU) |
Depth average |
27.5 or 120% of upstream
control station¡¦s turbidity at the same tide of the same day; The action level has been
amended to ¡§27.5 and 120% of upstream control station¡¦s turbidity at the same
tide of the same day¡¨ since 25 March 2013. |
47.0 or 130% of turbidity
at the upstream control station at the same tide of same day; The limit level has been
amended to ¡§47.0 and 130% of turbidity at the upstream control station at the
same tide of same day¡¨ since 25 March 2013. |
Suspended Solid (SS)
(mg/L) |
Depth average |
23.5 or 120% of upstream
control station¡¦s SS at the same tide of the same day; The action level has been
amended to ¡§23.5 and 120% of upstream control station¡¦s SS at the same tide of
the same day¡¨ since 25 March 2013. |
34.4 or 130% of SS at the
upstream control station at the same tide of same day and 10mg/L for Water
Services Department Seawater Intakes; The limit level has been
amended to ¡§34.4 and 130% of SS at the upstream control station at the same
tide of same day and 10mg/L for Water Services Department Seawater Intakes¡¨
since 25 March 2013 |
(1) Depth-averaged
is calculated by taking the arithmetic means of reading of all three depths.
(2) For DO,
non-compliance of the water quality limit occurs when monitoring result is
lower that the limit.
(3) For SS &
turbidity non-compliance of the water quality limits occur when monitoring
result is higher than the limits.
(4) The change to
the Action and limit Levels for Water Quality Monitoring for the EM&A works
was approved by EPD on 25 March 2013. Therefore, the amended Action and Limit
Levels are applied for the water monitoring results obtained on and after 25
March 2013.
Table 2.4 Action
and Limit Level for Dolphin Impact Monitoring
|
North Lantau
Social Cluster |
|
NEL |
NWL |
|
Action Level |
STG < 70% of baseline
& |
STG < 70% of baseline
& |
Limit Level |
STG < 40% of baseline
& |
Remarks:
(1)
STG means quarterly average encounter rate of
number of dolphin sightings.
(2)
ANI means quarterly average encounter rate of
total number of dolphins.
(3)
For North Lantau Social Cluster, AL will be
triggered if either NEL or NWL fall below the criteria; LL will be triggered if
both NEL and NWL fall below the criteria.
Table 2.5 Derived
Value of Action Level (AL) and Limit Level (LL)
|
North Lantau
Social Cluster |
|
NEL |
NWL |
|
Action Level |
STG < 4.2 & ANI
< 15.5 |
STG < 6.9 & ANI
< 31.3 |
Limit Level |
(STG < 2.4 & ANI
< 8.9) and (STG < 3.9 & ANI < 17.9) |
Remarks:
(1)
STG means quarterly average encounter rate of
number of dolphin sightings.
(2)
ANI means quarterly average encounter rate of
total number of dolphins.
(3)
For North Lantau Social Cluster, AL will be
triggered if either NEL or NWL fall below the criteria; LL will be triggered if
both NEL and NWL fall below the criteria.
Table 3.1 Summary
of 1-hour TSP Monitoring Results Obtained During the Reporting Period
Reporting Period |
Monitoring Station |
Average (mg/m3) |
Range (mg/m3) |
Action Level (mg/m3) |
Limit Level (mg/m3) |
Jun 2023 |
AMS5 |
36 |
9-109 |
352 |
500 |
AMS6 |
-- |
-- |
360 |
||
Jul 2023 |
AMS5 |
31 |
3-89 |
352 |
|
AMS6 |
-- |
-- |
360 |
||
Aug 2023 |
AMS5 |
17 |
5-47 |
352 |
|
AMS6 |
-- |
-- |
360 |
Table 3.2 Summary
of 24-hour TSP Monitoring Results Obtained During the Reporting Period
Reporting Period |
Monitoring Station |
Average (mg/m3) |
Range (mg/m3) |
Action Level (mg/m3) |
Limit Level (mg/m3) |
Jun
2023 |
AMS5 |
25 |
15-42 |
164 |
260 |
AMS6 |
-- |
-- |
173 |
||
Jul
2023 |
AMS5 |
25 |
13-35 |
164 |
|
AMS6 |
-- |
-- |
173 |
||
Aug
2023 |
AMS5 |
25 |
16-36 |
164 |
|
AMS6 |
-- |
-- |
173 |
Reporting period |
Monitoring Station |
Average Leq (30 mins),
dB(A)* |
Range of Leq (30
mins), dB(A)* |
Action Level |
Limit Level Leq (30
mins), dB(A) |
Jun 2023 |
NMS5 |
62 |
60-66 |
When one documented complaint is received |
75 |
Jul 2023 |
58 |
56-60 |
|||
Aug 2023 |
56 |
55-58 |
SPSE = ((S / E) x 100) / SA%
DPSE = ((D / E) x 100) / SA%
where S
= total number of on-effort sightings
D = total number of dolphins from on-effort sightings
E = total number of units of survey effort
SA% = percentage of sea area
Distribution
Table 3.4 Dolphin Encounter Rates
(Sightings Per 100 km of Survey Effort) During Reporting Period (June 2023 to August 2023)
SURVEY AREA |
DOLPHIN MONITORING DATES |
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) |
Primary Lines
Only |
Primary Lines
Only |
||
Northeast Lantau |
Set 1 (5, 6 &
12 Jun 2023) |
0.00 |
0.00 |
Set 2 (19 &
20 Jun 2023) |
0.00 |
0.00 |
|
Set 3 (5 & 7 Jul 2023) |
0.00 |
0.00 |
|
Set 4 (25 &
26 Jul 2023) |
0.00 |
0.00 |
|
Set 5 (7 &
11 Aug 2023) |
0.00 |
0.00 |
|
Set 6 (14 &
24 Aug 2023) |
0.00 |
0.00 |
|
Northwest
Lantau |
Set 1 (5, 6 &
12 Jun 2023) |
0.00 |
0.00 |
Set 2 (19 &
20 Jun 2023) |
0.00 |
0.00 |
|
Set 3 (5 & 7 Jul 2023) |
0.00 |
0.00 |
|
Set 4 (25 &
26 Jul 2023) |
0.00 |
0.00 |
|
Set 5 (7 &
11 Aug 2023) |
1.62 |
1.62 |
|
Set 6 (14 &
24 Aug 2023) |
0.00 |
0.00 |
|
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) |
||
June ¡V August 2023 |
September
¡V November 2011 |
June ¡V August 2023 |
September
¡V November 2011 |
|
Northeast Lantau |
0.0 |
6.00 ¡Ó 5.05 |
0.0 |
22.19 ¡Ó 26.81 |
Northwest Lantau |
0.27 ¡Ó 0.66 |
9.85 ¡Ó 5.85 |
0.27 ¡Ó 0.66 |
44.66 ¡Ó 29.85 |
Notes:
1) The encounter rates deduced from the baseline monitoring period have been
recalculated based only on survey effort and on-effort sighting data made along
the primary transect lines under favourable conditions.
2) ¡Ó denotes the standard deviation of the average encounter rates.
Table 3.6 Comparison of Average Dolphin Encounter Rates in Northeast Lantau
Survey Area from All Winter Quarters of Impact Monitoring Period and Baseline
Monitoring Period (Sep ¡V Nov 2011)
|
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) |
September-November 2011 (Baseline) |
6.00 ¡Ó
5.05 |
22.19 ¡Ó 26.81 |
June-August 2013
(HKLR03 Impact) |
0.88 ¡Ó
1.36 |
3.91 ¡Ó
8.36 |
June-August 2014
(HKLR03 Impact) |
0.42 ¡Ó
1.04 |
1.69 ¡Ó
4.15 |
June-August 2015
(HKLR03 Impact) |
0.44 ¡Ó
1.08 |
0.44 ¡Ó
1.08 |
June-August 2016
(HKLR03 Impact) |
0.00 |
0.00 |
June-August 2017
(HKLR03 Impact) |
0.00 |
0.00 |
June-August 2018
(HKLR03 Impact) |
0.00 |
0.00 |
June-August 2019
(HKLR03 Impact) |
0.00 |
0.00 |
June-August 2020
(TMCLKL Post-Construction) |
0.00 |
0.00 |
June-August 2021
(TMCLKL Post-Construction) |
0.00 |
0.00 |
June-August 2022
(HKLR03 Impact) |
0.00 |
0.00 |
June-August 2023
(HKLR03 Impact) |
0.00 |
0.00 |
Notes:
1) The encounter rates deduced from the baseline monitoring period have been
recalculated based only on survey effort and on-effort sighting data made along
the primary transect lines under favourable conditions.
2) ¡Ó denotes the standard deviation of the average encounter rates.
Table 3.7 Comparison of Average Dolphin
Encounter Rates in Northwest Lantau Survey Area from All Winter Quarters of
Impact Monitoring Period and Baseline Monitoring Period (Sep ¡V Nov 2011)
|
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) |
September-November 2011 (Baseline) |
9.85 ¡Ó
5.85 |
44.66 ¡Ó 29.85 |
June-August 2013
(HKLR03 Impact) |
6.56 ¡Ó
3.68 |
27.00 ¡Ó 18.71 |
June-August 2014
(HKLR03 Impact) |
4.74 ¡Ó
3.84 |
17.52 ¡Ó 15.12 |
June-August 2015
(HKLR03 Impact) |
2.53 ¡Ó
3.20 |
9.21 ¡Ó 11.57 |
June-August 2016
(HKLR03 Impact) |
1.72 ¡Ó
2.17 |
7.48 ¡Ó 10.98 |
June-August 2017
(HKLR03 Impact) |
2.20 ¡Ó
2.88 |
6.58 ¡Ó
8.12 |
June-August 2018
(HKLR03 Impact) |
1.16 ¡Ó
1.39 |
2.87 ¡Ó
3.32 |
June-August 2019
(HKLR03 Impact) |
0.62 ¡Ó
1.52 |
1.55 ¡Ó
3.80 |
June-August 2020
(TMCLKL Post-Construction) |
0.57 ¡Ó
0.89 |
0.57 ¡Ó
0.89 |
June-August 2021
(TMCLKL Post-Construction) |
0.00 |
0.00 |
June-August 2022
(HKLR03 Impact) |
0.28 ¡Ó 0.67 |
0.28 ¡Ó
0.67 |
June-August 2023
(HKLR03 Impact) |
0.27 ¡Ó
0.66 |
0.27 ¡Ó
0.66 |
Table 3.8 Comparison of average dolphin group
sizes from impact monitoring period (June ¡V August 2023) and baseline
monitoring period (September ¡V November 2011) (Note: ¡Ó denotes the standard deviation of the average group size)
|
Average Dolphin Group
Size |
|
June ¡V August
2023 |
September ¡V November 2011 |
|
Overall |
1.00 (n = 1) |
3.72 ¡Ó 3.13 (n = 66) |
Northeast Lantau |
-- |
3.18 ¡Ó 2.16 (n = 17) |
Northwest Lantau |
1.00 (n = 1) |
3.92 ¡Ó 3.40 (n = 49) |