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.
14 (Dec 2015 to Feb 2016)
9
August 2016
Revision 2
Main Contractor Designer
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 Asia Pacific Limited has been 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 will be providing environmental team services to the
Contract.
This is the fourteenth 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 December 2015 to 29 February 2016.
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 |
|||
December 2015 |
January
2016 |
February
2016 |
||
Air
Quality |
1-hr TSP |
4, 10, 15, 21, 24 and 30 |
5, 11, 15, 21 and 27 |
2, 6, 12, 18 and 24 |
24-hr TSP |
AMS5: 3, 9, 14, 18, 23 and 29 AMS6: 3, 9, 14, 18 and 29 |
AMS5: 4, 8, 14, 20
and 26 AMS6: 5, 8, 14, 20 and 26 |
AMS5: 1, 5, 17, 18,
23 and 29 AMS6: 1, 5, 11, 17, 23 and 29 |
|
Noise |
10, 15, 21 and 30 |
5, 11, 21 and 27 |
2, 12, 18 and 24 |
|
Water
Quality |
2, 4, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28
and 30 |
1, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27
and 29 |
1, 3, 5, 11, 13, 15, 17, 19, 22, 24, 26 and
29 |
|
Chinese
White Dolphin |
2, 7, 9 and 15 |
8, 11, 13 and 19 |
2, 3, 16 and 22 |
|
Mudflat
Monitoring (Ecology) |
5, 12, 13, 16, 19
and 20 |
-- |
-- |
|
Mudflat
Monitoring (Sedimentation rate) |
1 |
-- |
-- |
|
Site Inspection |
2, 9, 17, 23 and 29 |
6, 13, 20 and 29 |
3, 12, 15 and 26 |
Due to weather
condition/boat availability, the dolphin monitoring schedule was rescheduled
from 10 December 2015 to 9 December 2015, from 14 December 2015 to 15 December
2015, from 12 January 2016 to 13 January 2016, from 18 January 2016 to 19
January 2016, from 1 February 2016 to 2 February 2016.
Due to
clash of schedule, the dolphin monitoring schedule was rescheduled from 4
January 2016 to 11 January 2016.
Due to power interruption of HVS at
AMS6 on 23 December 2015, the 24-hr TSP monitoring result obtained at AMS6 on
23 December 2015 was considered invalid.
Due to malfunctioning
of timer of HVS at AMS6 on 4 January 2016, the 24-hr TSP monitoring at AMS6 on
4 January 2016 was cancelled. The timer was replaced and was used for 24hr TSP
monitoring on 5 January 2016.
The monitoring period
of the 24-hr TSP monitoring on 11 February 2016 was less than 24 hours due to
malfunction of HVS at AMS5. Therefore, the 24-hr TSP monitoring on 11 February
2016 was rescheduled to 18 February 2016.
As
informed by the Contractor on 29 January 2016, no marine work was undertaken by
Contract no. HY/2011/03 during the Chinese New Year Period from 7 - 10 February
2016. Therefore, the scheduled
impact water quality monitoring on 8 February 2016 was cancelled and water
quality monitoring on 10 and 12 February 2016 were rescheduled to 11 and 13
February 2016.
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 |
5 |
0 |
24-hr TSP |
0 |
0 |
|
Noise |
Leq
(30 min) |
0 |
0 |
Water
Quality |
Suspended
solids level (SS) |
1 |
1 |
Turbidity
level |
0 |
2 |
|
Dissolved
oxygen level (DO) |
0 |
0 |
|
Dolphin
Monitoring |
Quarterly
Analysis (Dec 2015 to Feb 2016) |
0 |
1 |
The Environmental Team investigated all
exceedances and found that they were not project related.
All investigation reports for exceedances of the
Contract have 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 on a weekly
basis 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
were no complaints received in relation to the environmental impacts during the
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 quarterly summary 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- East:813273, North 818850) 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.
Table 1.1 Construction
Activities during Reporting Period
Description of Activities |
Site Area |
Dismantling/trimming of
temporary 40mm stone platform for construction of seawall |
Portion X |
Filling works behind
stone platform |
Portion X |
Construction of seawall |
Portion X |
Loading and unloading
of filling materials |
Portion X |
Band drains
installation |
Portion X |
Excavation and lateral
support works for Scenic Hill Tunnel (Cut & Cover Tunnel) |
Portion X |
Socket H-Piling work
for Scenic Hill Tunnel (Cut & Cover Tunnel) |
Portion X |
Excavation for diversion of culvert PR10 |
Portion X |
Construction of tunnel
box structure at Scenic Hill Tunnel (Cut & Cover Tunnel) |
Portion X |
Pipe piling works for
HKBCF to Airport Tunnel East (Cut & Cover Tunnel) |
Portion X |
Excavation for HKBCF to
Airport Tunnel |
Portion X |
Sheet Piling Works for HKBCF to Airport Tunnel East (Cut & Cover
Tunnel) |
Portion X |
Socket H-Piling Works for HKBCF to Airport Tunnel East (Cut &Cover
Tunnel) |
Portion X |
Superstructure works
for Scenic Hill Tunnel West Portal Ventilation building |
West Portal |
Pipe piling works for HKBCF to Airport Tunnel West (Cut & Cover
Tunnel) |
Airport Road |
Works for diversion |
Kwo Lo Wan Road and Airport Road |
Utilities detection |
Airport Road/ Airport Express Line/ East Coast Road |
Establishment of Site
Access |
Airport Road/ Airport Express Line/ East Coast Road |
Canopy pipe drilling / Box Jacking underneath Airport
Express Line |
Airport Express Line |
Pipe roofing drilling / Mined
Tunnel excavation underneath Airport Road |
Airport Road |
Excavation and lateral
support works at shaft 3 extension north shaft |
Kwo Lo Wan Road |
Excavation and Lateral
Support Works for HKBCF to Airport Tunnel West (Cut & Cover Tunnel) |
Airport Road |
Utility culvert
excavation |
Portion Y |
Sub-structure &
superstructure works for Highway Operation and Maintenance Area Building |
Portion Y |
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), |
NMS5 |
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 |
-- |
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) |
December 2015 |
AMS5 |
188 |
103 - 390 |
352 |
500 |
AMS6 |
191 |
83 - 385 |
360 |
||
January 2016 |
AMS5 |
174 |
81 -
445 |
352 |
|
AMS6 |
158 |
76 -
291 |
360 |
||
February 2016 |
AMS5 |
138 |
88 -
213 |
352 |
|
AMS6 |
134 |
82 -
181 |
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) |
December 2015 |
AMS5 |
54 |
25 -
79 |
164 |
260 |
AMS6 |
88 |
65 -
114 |
173 |
||
January 2016 |
AMS5 |
43 |
19 -
65 |
164 |
|
AMS6 |
59 |
28 -
94 |
173 |
||
February 2016 |
AMS5 |
51 |
18 -
102 |
164 |
|
AMS6 |
73 |
27 -
134 |
173 |
Table 3.3 Summary of Construction Noise
Monitoring Results Obtained During the Reporting Period
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) |
December 2015 |
NMS5 |
61 |
58 ¡V 65 |
When one documented complaint is received |
75 |
January 2016 |
61 |
58 ¡V 65 |
|||
February 2016 |
61 |
59 ¡V 62 |
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
Table
3.4 Dolphin
Encounter Rates (Sightings Per 100 km of Survey Effort) During Reporting Period
(December 2015 to February 2016)
Survey Area |
Dolphin Monitoring |
Encounter rate (STG) |
Encounter rate (ANI) |
Primary Lines Only |
Primary Lines Only |
||
Northeast Lantau |
Set 1 (2 & 7 Dec 2015) |
0.00 |
0.00 |
Set 2 (9 & 15 Dec 2015) |
0.00 |
0.00 |
|
Set 3 (8 & 11 Jan 2016) |
0.00 |
0.00 |
|
Set 4 (13 & 19 Jan 2016) |
0.00 |
0.00 |
|
Set 5 (2 & 3 Feb 2016) |
0.00 |
0.00 |
|
Set 6 (16 & 22 Feb 2016) |
0.00 |
0.00 |
|
Northwest Lantau |
Set 1 (2 & 7 Dec 2015) |
4.12 |
17.84 |
Set 2 (9 & 15 Dec 2015) |
4.78 |
11.94 |
|
Set 3 (8 & 11 Jan 2016) |
2.79 |
9.78 |
|
Set 4 (13 & 19 Jan 2016) |
1.36 |
10.90 |
|
Set 5 (2 & 3 Feb 2016) |
1.35 |
6.75 |
|
Set 6 (16 & 22 Feb 2016) |
1.44 |
8.66 |
Survey Area |
Encounter rate (STG) |
Encounter rate (ANI) |
||
Reporting Period |
Baseline Monitoring Period |
Reporting Period |
Baseline Monitoring Period |
|
Northeast Lantau |
0.0 |
6.00 ¡Ó 5.05 |
0.0 |
22.19 ¡Ó 26.81 |
Northwest Lantau |
2.64 ¡Ó 1.52 |
9.85 ¡Ó 5.85 |
10.98 ¡Ó 3.81 |
44.66 ¡Ó 29.85 |
Notes:
1) The encounter rates deduced from the baseline monitoring period have been
recalculated based only on the 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 Quarters of
Impact Monitoring Period and Baseline Monitoring Period (Sep ¡V Nov 2011)
Monitoring Period |
Encounter rate (STG) |
Encounter rate (ANI) |
September-November 2011
(Baseline) |
6.00 ¡Ó 5.05 |
22.19 ¡Ó 26.81 |
December 2012-February 2013 (Impact) |
3.14 ¡Ó 3.21* |
6.33 ¡Ó 8.64* |
March-May
2013 (Impact) |
0.42 ¡Ó 1.03 |
0.42 ¡Ó 1.03 |
June-August
2013 (Impact) |
0.88 ¡Ó 1.36 |
3.91 ¡Ó 8.36 |
September-November 2013 (Impact) |
1.01
¡Ó 1.59 |
3.77
¡Ó 6.49 |
December 2013-February 2014 (Impact) |
0.45 ¡Ó 1.10* |
1.34 ¡Ó 3.29* |
March-May
2014 (Impact) |
0.00 |
0.00 |
June-August 2014 (Impact) |
0.42 ¡Ó 1.04 |
1.69 ¡Ó 4.15 |
September-November 2014 (Impact) |
0.00 |
0.00 |
December 2014-February 2015 (Impact) |
0.00* |
0.00* |
March-May 2015 (Impact) |
0.00 |
0.00 |
June-August 2015 (Impact) |
0.44 ¡Ó 1.08 |
0.44 ¡Ó 1.08 |
September-November 2015 (Impact) |
0.00 |
0.00 |
December 2015-February 2016 (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.
3) The encounter rates in
winter months were in blue and marked with asterisk.
Table 3.7 Comparison of Average Dolphin Encounter Rates in Northwest Lantau
Survey Area from All Quarters of Impact Monitoring Period and Baseline
Monitoring Period (Sep ¡V Nov 2011)
Monitoring Period |
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 |
December 2012-February 2013 (Impact) |
8.36 ¡Ó 5.03* |
35.90 ¡Ó 23.10* |
March-May 2013 (Impact) |
7.75 ¡Ó 3.96 |
24.23 ¡Ó 18.05 |
June-August 2013 (Impact) |
6.56 ¡Ó 3.68 |
27.00 ¡Ó 18.71 |
September-November
2013 (Impact) |
8.04 ¡Ó 1.10 |
32.48 ¡Ó 26.51 |
December 2013-February 2014 (Impact) |
8.21 ¡Ó 2.21* |
32.58 ¡Ó 11.21* |
March-May 2014 (Impact) |
6.51 ¡Ó 3.34 |
19.14 ¡Ó 7.19 |
June-August 2014 (Impact) |
4.74 ¡Ó 3.84 |
17.52 ¡Ó 15.12 |
September-November
2014 (Impact) |
5.10 ¡Ó 4.40 |
20.52 ¡Ó 15.10 |
December 2014-February 2015 (Impact) |
2.91 ¡Ó 2.69* |
11.27 ¡Ó 15.19* |
March-May 2015 (Impact) |
0.47 ¡Ó 0.73 |
2.36 ¡Ó 4.07 |
June-August 2015 (Impact) |
2.53 ¡Ó 3.20 |
9.21 ¡Ó 11.57 |
September-November
2015 (Impact) |
3.94 ¡Ó 1.57 |
21.05 ¡Ó 17.19 |
December 2015-February 2016 (Impact) |
2.64 ¡Ó 1.52* |
10.98 ¡Ó 3.81* |
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.
3) The
encounter rates in winter months were in blue and marked with asterisk.
Table 3.8 Comparison
of Average Dolphin Group Sizes between Reporting Period (Dec 2015 ¡V Feb 2016)
and Baseline Monitoring Period (Sep ¡V Nov 2011)
Survey Area |
Average Dolphin Group Size |
|
Reporting Period |
Baseline Monitoring Period |
|
Overall |
4.07 ¡Ó 3.22 (n = 14) |
3.72 ¡Ó 3.13 (n = 66) |
Northeast Lantau |
N/A |
3.18 ¡Ó 2.16 (n = 17) |
Northwest Lantau |
4.07 ¡Ó 3.22 (n = 14) |
3.92 ¡Ó 3.40 (n = 49) |
Note:
1) ¡Ó denotes the standard deviation of the average
group size.
Table 3.9 Measured
Mudflat Surface Level Results
Baseline Monitoring |
Impact Monitoring |
|||||
Monitoring Station |
Easting |
Northing (m) |
Surface Level |
Easting |
Northing (m) |
Surface Level (mPD) |
S1 |
810291.160 |
816678.727 |
0.950 |
810291.172 |
816678.729 |
1.052 |
S2 |
810958.272 |
815831.531 |
0.864 |
810958.261 |
815831.520 |
0.974 |
S3 |
810716.585 |
815953.308 |
1.341 |
810716.586 |
815953.312 |
1.475 |
S4 |
811221.433 |
816151.381 |
0.931 |
811221.460 |
816151.373 |
1.071 |
Table 3.10 Comparison
of Measurement
Comparison of measurement |
Remarks and Recommendation |
|||
Monitoring Station |
Easting |
Northing (m) |
Surface Level |
|
S1 |
0.012 |
0.002 |
0.102 |
Level continuously increased |
S2 |
-0.011 |
-0.011 |
0.110 |
Level continuously increased |
S3 |
0.001 |
0.004 |
0.134 |
Level continuously increased |
S4 |
0.027 |
-0.008 |
0.140 |
Level continuously increased |
Table 3.11 Impact
Water Quality Monitoring Results (Depth Average)
Date |
Mid Ebb Tide |
Mid Flood Tide |
||||
DO (mg/L) |
Turbidity
(NTU) |
SS (mg/L) |
DO (mg/L) |
Turbidity
(NTU) |
SS (mg/L) |
|
2-Dec-15 |
6.56 |
7.35 |
7.20 |
6.51 |
9.50 |
10.40 |
4-Dec-15 |
6.29 |
5.95 |
6.40 |
6.71 |
4.85 |
8.40 |
7-Dec-15 |
6.31 |
6.40 |
6.40 |
6.38 |
4.75 |
4.75 |
9-Dec-15 |
6.30 |
9.55 |
10.50 |
6.47 |
6.60 |
8.30 |
11-Dec-15 |
6.34 |
8.35 |
10.35 |
6.22 |
6.55 |
7.80 |
14-Dec-15 |
6.62 |
9.95 |
10.25 |
6.61 |
8.60 |
10.70 |
16-Dec-15 |
7.22 |
9.55 |
10.70 |
6.75 |
12.05 |
13.70 |
18-Dec-15 |
7.16 |
5.80 |
8.70 |