Agreement No. CE 35/2006(CE)
Kai Tak Development
Engineering Study
cum Design and Construction of Advance
Works
– Investigation, Design and Construction
Kai Tak Development
Environmental Monitoring and Audit Manual
Contents
7............
Water Quality Impact. 7-1
7.1 Introduction. 7-1
7.2 Marine Water
Quality Monitoring Schedule and Stations. 7-2
7.3 Marine Water
Quality Sampling Frequency and Method. 7-3
7.4 Marine Water
Quality Monitoring Parameters.
7-4
7.5 Field Log for
Marine Water Quality Monitoring.
7-6
7.6 Marine Water
Quality Monitoring Equipment 7-6
7.7 Laboratory
Measurement / Analysis for Marine Water Quality Samples. 7-8
7.8 Event and Action
Plan for Marine Water Quality Monitoring. 7-9
7.9 Red Tide
Monitoring Programme and Action Plan. 7-15
7.10 Mitigation of
Adverse Environmental Impacts.
7-16
Lists of Tables
Table 7.1.......... Proposed
Marine Water Quality Monitoring Stations
Table
7.2.......... Suggested Analytical Methods and Detection Limit
Table
7.3.......... Action and Limit Levels for Marine
Water Quality
Table
7.4.......... Event and Action Plan for Marine
Water Quality
7
Water Quality Impact
7.1
Introduction
7.1.1
Water quality impact during the proposed
dredging works of this Project will be minimized through implementation of the
mitigation measures recommended in the EIA study. Implementation of
regular site audits is recommended to ensure that the recommended mitigation
measures are to be properly undertaken during the proposed dredging works.
It can also provide an effective control of any malpractices and
therefore achieve continual improvement of environmental performance on
site.
7.1.2
The EIA Report has
identified that suspended solids (SS) would be the most critical water quality
parameter during the dredging operations. Marine water quality monitoring
for SS and turbidity is therefore recommended to be carried out at selected WSD
flushing water intakes. The monitoring should include baseline and impact
monitoring. The impact monitoring should be carried out during the
proposed marine works for construction of the cruise terminal, 600 m runway
opening, public landing steps cum fireboat berth and Road T2. Detailed
construction phase baseline and impact monitoring programme shall follow the
same requirements stipulated in the Approved EIA for Dredging Works for the
Proposed Cruise Terminal at Kai Tak and is
therefore not repeated under this Section.
7.1.3
With regards to the
proposed bioremediation for the sediment at Kai Tak
Approach Channel (KTAC) and Kwun Tong Typhoon Shelter
(KTTS), water quality monitoring and audit is also recommended to be carried
out during and for a period of one year after the bioremediation treatment
operation to ensure that the proposed treatment operation would not result in
unacceptable impact. Sediment quality monitoring will also be implemented
during the full scale sediment treatment operation following the requirements
as specified in Annex A of the EIA report (refer to Section 6.5.9 of Annex A)
for the pilot scale field test.
7.1.4
No unacceptable water
quality impact would be anticipated during operation of the Project. A water quality monitoring and audit programme
will be implemented before and after opening a 600 m gap at the runway to
ascertain the runway opening would not result in unacceptable impact and to
confirm the water quality impacts predicted under operational phase of the
Project. An algal bloom / red tide monitoring programme
and action plan will also be implemented to ascertain the runway opening and
bioremediation for the sediment at KTAC and KTTS would not result in
unacceptable impact.
7.1.5
The following monitoring programmes
are given in this Section:
Marine water quality monitoring and audit
programme for the proposed sediment treatment operation;
Marine water quality
monitoring and audit requirements before and after opening a 600 m gap at the
runway;
Red tide monitoring programme and action plan.
7.2
Marine Water Quality Monitoring Schedule and
Stations
7.2.1
Baseline monitoring
shall be carried out to obtain the ambient marine water quality information during the period one year before commencement of the Project works including the bioremediation for
the sediment at KTAC and KTTS as well as the construction of the runway
opening. Marine water quality monitoring shall be
carried out at the locations illustrated in Appendix E and Table
7.1. The monitoring locations include seven stations within the approach
channel (AC1-7), one station at the KTTS (KT1), three stations at inner Kowloon
Bay (IB1-3), one station at outer Kowloon Bay (OB1), two stations in the
Victoria Harbour adjacent to the Kowloon Bay (VH1-2)
and three stations at the WSD flushing water intakes. The coordinates of
the proposed monitoring locations are listed in Table 7.1. These
stations represent the areas which would potentially have water quality change
due to the 600 m runway opening as predicted by the water quality model. The locations
of the monitoring station may change after issuing this Manual. Any
necessary change in the monitoring locations shall be reviewed and agreed by
the EPD before the commencement of the monitoring.
Table 7.1 Proposed Marine Water Quality
Monitoring Stations
|
Station (refer to Appendix E)
|
Easting
|
Northing
|
|
AC1
|
838736.55
|
820147.04
|
|
AC2
|
838807.83
|
820218.32
|
|
AC3
|
838952.22
|
819920.71
|
|
AC4
|
839030.88
|
819988.82
|
|
AC5
|
839214.12
|
819690.85
|
|
AC6
|
839278.27
|
819755.00
|
|
AC7
|
839418.24
|
819545.62
|
|
KT1
|
840260.66
|
819010.57
|
|
IB1
|
838265.60
|
819861.53
|
|
IB2
|
838456.29
|
819465.93
|
|
IB3
|
838054.63
|
819176.01
|
|
OB1
|
839182.22
|
819134.25
|
|
VH1
|
837739.09
|
817553.42
|
|
VH2
|
840243.13
|
817588.53
|
|
WSD Intake at Tai Wan
|
838132.71
|
817798.61
|
|
WSD Intake at Cha Kwo
Ling
|
841528.70
|
817713.39
|
|
WSD
Intake at Quarry
Bay
|
839863.48
|
817077.46
|
Bioremediation for the Sediment at
KTAC and KTTS
7.2.2
The water quality
monitoring locations shall be at the locations likely to be affected by
bioremediation. Two monitoring locations in the vicinity of the works
area (i.e. one 100 m upstream and one 100 m downstream of the works area) shall
be selected as the impact monitoring stations.
7.2.3
In addition to the
impact monitoring stations, three control stations shall also be included for
comparing the water quality from potentially impacted sites with the ambient
water quality. They shall be sited outside the area of influence of the
works, as far as practicable, not affected by any other works. If
necessary, the water quality information collected under the baseline
monitoring programme shall be used as reference to assess the potential impacts
from the bioremediation works. The detailed programme or phasing of the
bioremediation works as well as the proposed monitoring locations shall be
submitted to EPD for approval before each phase of the bioremediation works
commences.
Impact from the 600 m Runway Opening
7.2.4
Marine water quality monitoring shall be
carried out during the first year of Project operation
with the 600 m runway opening. The monitoring locations shall be the
same as the baseline monitoring stations as shown in Table 7.1 to assess
the potential water quality change due to the 600 m runway opening and to
confirm the model predictions made in the EIA. The locations of the monitoring
station may change after issuing this Manual. Any necessary change in the
monitoring locations shall be reviewed and agreed by the EPD before the
commencement of the monitoring.
7.3
Marine Water Quality Sampling Frequency and
Method
Baseline Monitoring
7.3.1
The baseline marine water quality monitoring shall be
performed over one year before construction of the Project. At least 4 survey
events shall be undertaken over one year to give adequate coverage of different
tidal states during both wet and dry seasons. During each survey event,
sampling shall be taken at 2 tide conditions (mid-flood and mid-ebb). The
purpose of the baseline monitoring is to establish ambient conditions without
the Project. The baseline monitoring shall be ceased in the events of any
emergency sewage discharges. There should not be any marine construction
activities in the vicinity of the stations during the baseline monitoring.
7.3.2
For all the monitoring stations, sampling shall be
taken at three water depths, namely, 1m below water surface, mid-depth and 1m
above sea bed, except where the water depth is less than 6m, in which case the
mid-depth station may be omitted. Shall the water depth be less than 3m,
only the mid-depth station will be monitored.
For the WSD intake
points, the monitoring shall be conducted at the appropriate vertical levels of
the abstraction points of these intakes to collect water quality information. At each monitoring station, duplicate samples shall be collected at
each water depth. Sufficient volume of each water sample shall be collected for
analysis to achieve the required detection limit. In-situ
measurements at DO, pH, salinity, temperature and turbidity shall be taken at
0.5m depth intervals at all the marine water quality monitoring stations. The
proposed water quality monitoring programme and
schedule should be submitted to EPD at least 1 week before the first day of the
monitoring. EPD should also be notified immediately for any changes in
schedule.
Bioremediation for the Sediment at
KTAC and KTTS
7.3.3
Monitoring is required
for the period from commencement of and throughout the duration of
bioremediation works and during the first year after completion of the
bioremediation works. The monitoring shall be carried out at the
designated locations three times per week, at mid-flood and mid-ebb tides.
The interval between two sets of monitoring shall not be less than 36
hours except where there are exceedances of AL levels, in which case
monitoring frequency shall be increased. During each sampling occasion,
measurements shall be taken at three water depths, namely, 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. Shall the
water depth be less than 3 m, only the mid-depth station will be monitored.
7.3.4
The proposed water quality monitoring schedule should
be submitted to EPD at least 1 week before the first day of the monitoring. EPD should
also be notified immediately for any changes in schedule. If the
monitoring data collected at the monitoring stations indicate that the Action
or Limit Levels as shown in Table 7.3 are exceeded, appropriate actions
should be taken in accordance with the Event and Action Plan in Table 7.4.
Impact from the 600 m Runway Opening
7.3.5
The marine water quality monitoring shall be performed
during the first year of Project operation with the 600 m gap opened at the
runway. Similar to the baseline monitoring, at least 4 operational phase survey
events shall be undertaken over one year to give adequate coverage of different
tidal states during both wet and dry seasons. During each survey event,
sampling shall be taken at 2 tide conditions (mid-flood and mid-ebb). The
operation phase monitoring shall be ceased in the events of any emergency
discharges and the monitoring programme after the
first year of operation of the Project will be subject to the first year
review. Similar to the baseline monitoring, no marine construction
activities should be conducted in the vicinity of the stations during the
impact monitoring period.
7.3.6
Similar to the baseline monitoring, sampling shall be
taken at three water depths, namely, 1m below water surface, mid-depth and 1m
above sea bed, except where the water depth is less than 6m, in which case the
mid-depth station may be omitted. Shall the water depth be less than 3m,
only the mid-depth station will be monitored. For the WSD intake points, the
monitoring shall be conducted at the appropriate vertical levels of the
abstraction points of these intakes to collect water quality information. At each monitoring station, duplicate samples shall be collected at
each water depth. Sufficient volume of each water sample shall be
collected for analysis to achieve the required detection limit. In-situ
measurements at DO, pH, salinity, temperature and turbidity shall be taken at
0.5m depth intervals at all the marine water quality monitoring stations.
7.4
Marine Water Quality Monitoring Parameters
Baseline Monitoring Before
Construction of the Project
7.4.1
Parameters measured
in-situ:
Dissolved oxygen (DO);
pH;
Water Temperature;
Salinity;
Secchi disc depth; and
Turbidity.
7.4.2
Parameters measured in
laboratory:
Suspended Solids (SS);
E.coli;
5-day Biochemical Oxygen Demand (BOD5):
Ammonia Nitrogen (NH3-N);
Unionized Ammonia (UIA);
Total Kjeldahl Nitrogen (TKN);
Nitrite-nitrogen (NO2-N);
Nitrate-nitrogen (NO3-N);
Ortho-phosphate (PO4);
Total
Phosphorous (TP);
Cadmium (Cd);
Chromium (Cr);
Copper (Cu);
Mercury (Hg);
Nickel (Ni);
Lead (Pb);
Silver (Ag); and
Zinc (Zn).
Monitoring for Bioremediation of the
Sediment at KTAC and KTTS
7.4.3
Parameters measured
in-situ:
Dissolved oxygen (DO); and
Turbidity.
7.4.4
Parameters measured in
laboratory:
Suspended Solids (SS);
Nitrate-nitrogen (NO3-N);
Cadmium (Cd);
Chromium (Cr);
Copper (Cu);
Mercury (Hg);
Nickel (Ni);
Lead (Pb);
Silver (Ag); and
Zinc (Zn).
Impact Monitoring During Operation of
the 600 m Runway Opening
7.4.5
Parameters measured
in-situ:
Dissolved oxygen (DO);
pH;
Water Temperature;
Salinity;
Secchi disc depth; and
Turbidity.
7.4.6
Parameters measured in
laboratory:
Suspended Solids (SS);
E.coli;
5-day Biochemical Oxygen Demand (BOD5):
Ammonia Nitrogen (NH3-N);
Unionized Ammonia (UIA);
Total Kjeldahl Nitrogen (TKN);
Nitrite-nitrogen (NO2-N);
Nitrate-nitrogen (NO3-N);
Ortho-phosphate (PO4); and
Total
Phosphorous (TP).
7.5
Field Log for Marine Water Quality Monitoring
7.5.1
Other relevant data
should also be recorded, including monitoring location / position, time, water depth,
sampling depth, pH, salinity, DO saturation, water temperature, tidal stages,
weather conditions and any special phenomena or work underway nearby.
7.5.2
A sample data record
sheet is shown in Appendix
B for reference.
7.6
Marine Water Quality Monitoring Equipment
Dissolved Oxygen and Temperature
Measuring Equipment
7.6.1
The instrument
should be a portable and weatherproof DO measuring instrument complete with
cable and sensor, and use a DC power source. The equipment should be
capable of measuring:
· a DO level in the range of 0 ‑ 20 mg
L-1 and 0 ‑ 200% saturation; and
· a temperature of 0 ‑ 45 degree
Celsius.
7.6.2
It should have a
membrane electrode with automatic temperature compensation complete with a
cable (for example, YSI model 59 meter, YSI 5739 probe, YSI 5795A submersible
stirrer with reel and cable or an approved similar instrument).
Sufficient stocks of spare electrodes and cables should be available for replacement
where necessary.
7.6.3
Should salinity
compensation not be built-in to the DO equipment, in-situ salinity should be
measured to calibrate the DO equipment prior to each DO measurement.
Turbidity Measurement Instrument
7.6.4
Turbidity should be
measured in situ by the nephelometric method.
The instrument should be portable and weatherproof using a DC power source
complete with cable, sensor and comprehensive operation manuals. It
should have a photoelectric sensor capable of measuring turbidity between 0 -
1000 NTU (for example, Hach model 2100P or an
approved similar instrument). The cable should not be less than 25m in
length. The meter should be calibrated in order to establish the
relationship between NTU units and the levels of suspended solids. The
turbidity measurement should be carried out on split water sample collected
from the same depths of suspended solids samples.
Sampler
7.6.5
A water sampler is
required. It should comprise a transparent PVC cylinder, with a capacity
of not less than 2 litres, which can be effectively sealed with latex cups at
both ends. The sampler should have a positive latching system to keep it
open and prevent premature closure until released by a messenger when the sampler
is at the selected water depth (for example, Kahlsico
Water Sampler or an approved similar instrument).
Water Depth Detector
7.6.6
A portable,
battery-operated echo sounder should be used for the determination of water depth
at each designated monitoring station. This unit can either be hand held
or affixed to the bottom of the work boat, if the same vessel is to be used
throughout the monitoring programme.
pH
7.6.7
The instrument shall consist of a potentiometer, a
glass electrode, a reference electrode and a temperature-compensating device.
It shall be readable to 0.1pH in a range of 0 to 14. Standard buffer solutions
of at least pH 7 and pH 10 shall be used for calibration of the instrument
before and after use. Details of the method shall comply with APHA, 19th
ed. 4500-HTB.
Salinity
7.6.8
A portable, salinometer capable of measuring salinity in the range 0 –
40 mg/L shall be provided for measuring salinity of the water at each
monitoring location.
Sample Containers and Storage
7.6.9
Water samples for SS
should be stored in high density polythene bottles, packed in ice (cooled to
4°C without being frozen) and delivered to the laboratory and analysed as soon
as possible after collection. Sufficient volume of samples should be
collected to achieve the detection limit.
Monitoring Position Equipment
7.6.10
A hand-held or
boat-fixed type digital Differential Global Positioning System (DGPS) with way
point bearing indication or other equipment instrument of similar accuracy,
should be provided and used during water quality monitoring to ensure the
monitoring vessel is at the correct location before taking measurements.
DGPS or the equivalent instrument, calibrated at appropriate checkpoint (e.g.
Quarry Bay Survey Nail at Easting 840683.49, Northing 816709.55) should be
provided and used to ensure the monitoring station is at the correct position
before taking measurement and water samples.
Calibration of In-Situ Instruments
7.6.11
All in-situ monitoring
instruments should be checked, calibrated and certified by a laboratory
accredited under HOKLAS or any other international accreditation scheme before
use and subsequently re-calibrated at three monthly intervals throughout all
stages of the water quality monitoring programme. Responses of sensors
and electrodes should be checked with certified standard solutions before each
use. Wet bulb calibration for a DO meter should be carried out before
measurement at each monitoring location.
7.6.12
For the on site
calibration of field equipment, the BS 127:1993, Guide to Field and On-Site
Test Methods for the Analysis of Water should be observed.
7.6.13
Sufficient stocks of spare parts should be
maintained for replacements when necessary. Backup monitoring equipment should
also be made available so that monitoring can proceed uninterrupted even when
some equipment is under maintenance, calibration, etc.
7.7
Laboratory Measurement / Analysis for Marine Water Quality Samples
7.7.1
Water samples collected
at the monitoring stations shall be analyzed at the laboratory for the
specified parameters. Sufficient water samples of not less than 1 litre
should be collected at the monitoring stations for carrying out the laboratory
determinations. The suggested testing method and lowest detection limit
are provided in Table 7.2.
Table 7.2 Suggested Analytical Methods and Detection Limit
|
Determinant
|
Suggested Method
|
Suggested Detection Limit
|
|
Cadmium (Cd)
|
APHA 17ed 3111, 3113 and 3120 as appropriate
|
0.001 mg/L
|
|
Chromium (Cr)
|
0.01 mg/L
|
|
Copper (Cu)
|
0.01 mg/L
|
|
Silver (Ag)
|
0.01 mg/L
|
|
Nickel (Ni)
|
0.01 mg/L
|
|
Zinc (Zn)
|
0.01 mg/L
|
|
Lead (Pb)
|
0.01 mg/L
|
|
Mercury (Mg)
|
APHA
17ed 3112
|
0.001 mg/L *
|
|
Suspended Solids
|
APHA 17ed 2540D
|
1 mg/L
|
|
5-day Biochemical Oxygen
Demand
|
APHA 19ed 5210B
|
1 mg/L
|
|
Ammonia Nitrogen
|
APHA 19ed 4500-NH3 F
|
0.02 mg/L
|
|
Unionized Ammonia
|
By calculation
|
0.001 mg/L
|
|
Total Kjeldahl
Nitrogen
|
APHA 19ed 4500-Norg
|
0.01 mg/L
|
|
Nitrite-nitrogen
|
APHA 19ed 4500-NO2- B
|
0.01 mg/L
|
|
Nitrate-nitrogen
|
APHA 19ed 4500-NO3- E
|
0.02 mg/L
|
|
E. coli
|
EPD HKSAR, Wat. Sci. Tech. Vol.35, No. 11-12, pp 409-413
|
1 CFU per 100 ml
|
|
Ortho-phosphorus
|
APHA 19ed 4500- P.E
|
0.01 mg/L
|
|
Total Phosphorus
|
APHA 19ed 4500-P.B.E
|
0.01 mg/L
|
7.7.2
The testing of all
parameters should be HOKLAS accredited (or if not, approved by EPD) and
comprehensive quality assurance and control procedures in place in order to
ensure quality and consistency in results.
7.7.3
Detailed testing
methods, pre-treatment procedures, instrument use, Quality Assurance / Quality
Control (QA/QC) details (such as blank, spike recovery, number of duplicate
samples per batch, etc.), detection limits and accuracy should be submitted to
EPD for approval prior to the commencement of monitoring programme. EPD
may also request the laboratory to carry out analysis of known standards
provided by EPD for quality assurance. The QA/QC should be in accordance with
the requirement of HOKLAS or international accredited scheme. The QA/QC
results should be reported. The testing methods and related proposal
should be checked and certified by IEC before submission to EPD for approval.
7.7.4
Additional duplicate
samples may be required by EPD for inter laboratory calibration. Remaining
samples after analysis should be kept by the laboratory for 3 months in case
repeat analysis is required. If in-house or non-standard methods are
proposed, details of the method verification may also be required to submit to
EPD. In any circumstance, the sample testing should have comprehensive
quality assurance and quality control programmes. The laboratory should
prepare to demonstrate the programmes to EPD or EPD’s
representatives when requested.
7.8
Event and Action Plan for Marine Water Quality Monitoring
Monitoring for Bioremediation of the
Sediment at KTAC and KTTS
7.8.1
The water quality assessment criteria,
namely Action and Limit Levels are shown in Table 7.3. If the
monitoring results of the water quality parameters at any designated monitoring
stations indicate that the water quality assessment criteria are exceeded, the
actions in accordance with the Event and Action Plan in Table 7.4 should
be carried out.
7.8.2
The ET Leader should
assess the potential water quality impacts based on the monitoring data.
The performance of the environmental management system (i.e. of the overall
EM&A programme) should be reviewed by the ET Leader on a quarterly
basis. The findings of this review should be included in the quarterly
EM&A summary reports, together with any recommendations to improve the
performance of the EM&A programme.
Table 7.3 Action and Limit Levels for
Marine Water Quality
|
Parameters
|
Action
|
Limit
|
|
DO in
mg L-1 (Bottom)
|
0.01
|
|
|
SS in
mg L-1 (Bottom)
|
120%
of upstream control station’s SS at the same tide of the same day
or
95 percentile of baseline data.
|
130%
of upstream control station’s SS at the same tide of the same day.
or
99 percentile
of baseline data.
|
|
Turbidity
in NTU
|
120%
of upstream control station’s SS at the same tide of the same day
or
95
percentile of baseline data.
|
130%
of upstream control station’s SS at the same tide of the same day
or
99 percentile
of baseline data.
|
|
Nitrate-Nitrogen
in mg L-1 (depth average)
|
120%
of upstream control station’s nitrate-nitrogen (depth average) at the same
tide of the same day + 0.9 mg/L of anticipated increase due to nitrate
injection
or
95
percentile of baseline data + 0.9 mg/L of anticipated increase due to nitrate
injection
|
130%
of upstream control station’s nitrate-nitrogen (depth average) at the same
tide of the same day + 0.9 mg/L of anticipated increase due to nitrate
injection
or
99
percentile of baseline data + 0.9 mg/L of anticipated increase due to nitrate
injection
|
|
Heavy
metals (Cr, Cd, Cu, Zn, Ag, Hg, Ni and Pb)
|
120%
of upstream control station’s level at the same tide of the same day
or
95
percentile of baseline data.
|
130%
of upstream control station’s level at the same tide of the same day
or
99
percentile of baseline data.
|
Remarks:
1. For turbidity and SS,
non-compliance of the water quality limits occurs when monitoring result is
higher than the limits.
2. All the figures
given in the table are used for reference only and EPD may amend the figures
whenever it is considered as necessary.
7.8.3
With respect to the
Action Limit (AL) level for nitrate-nitrogen, reference has been made to the
tolerable levels in similar project sites in Shing Mun River
and Sam Ka Tsuen Typhoon Shelter as well as the in-situ
bioremediation pilot scale field test performed at KTAC in 2006 where
bioremediation works involving nitrate-injection have previously been
undertaken. During the bioremediation process, it is inevitable that there will
be some minor disturbance to the sediment and therefore a potential for release
of in-situ nitrate-nitrogen levels into the water column. It is proposed
that a factor of + 0.9 mg/L (based on similar bioremediation projects in Hong
Kong) is adopted on top of the calculated AL levels. In case it is more
desirable to use the water quality information collected under the baseline
monitoring programme to assess the effect of the proposed bioremediation works,
the relevant baseline water quality information as well as the associated
Action and Limit Levels shall be submitted and reported in the Baseline Marine
Water Quality Monitoring Report for agreement with EPD before commencement of
any bioremediation work and impact monitoring work.
Impact from the 600 m Runway Opening
Analysis of Monitoring Data and Follow-up
Actions
7.8.4
Once the operation phase monitoring programme
for the year is complete, the operation phase monitoring data obtained for the
year should be compared with the baseline monitoring data using appropriate
statistical analysis technique to determine the change of contaminant
concentrations in marine water after implementation of the Project. Based
on the review and analysis of the monitoring data, the effectiveness of the 600
m runway opening for improving the water quality in the marine water shall be
determined. Also, the need for further water quality control or
mitigation measures to the Project operation shall be identified.
Table 7.4
Event and Action Plan for Marine Water Quality
|
EVENT
|
ACTION
|
|
|
ET
|
IEC
|
ER
|
CONTRACTOR
|
|
Action level being exceeded by one sampling
day
|
1.
Repeat in-situ measurement
to confirm findings;
2.
Identify source(s) of
impact;
3.
Inform IEC and
Contractor;
4.
Check monitoring
data, all work process and Contractor's working methods;
5.
Discuss mitigation
measures with IEC and Contractor;
(The above actions should be taken within 1
working day after the exceedance is identified)
6.
Repeat measurement on
next day of exceedance.
|
1.
Discuss with ET and
Contractor on the mitigation measures;
2.
Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
3.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Discuss with IEC on
the proposed mitigation measures;
2.
Make agreement on the
mitigation measures to be implemented.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Inform the ER and
confirm notification of the non-compliance in writing;
2.
Rectify unacceptable
practice;
3.
Check all work
process and methods;
4.
Consider changes of
working methods or slow down the work process;
5.
Discuss with ET and
IEC and propose mitigation measures to IEC and ER;
6.
Implement the agreed
mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
|
Action level being
exceeded by more
than one
consecutive
sampling days
|
1.
Identify source(s) of
impact;
2.
Inform IEC and
Contractor;
3.
Check monitoring
data, all work process and Contractor's working methods;
4.
Discuss mitigation
measures with IEC and Contractor;
5.
Ensure mitigation
measures are implemented;
6.
Prepare to increase
the monitoring frequency to daily;
The above actions should be taken within 1
working day after the exceedance is identified)
7.
Repeat measurement on
next working day of exceedance.
|
1.
Discuss with ET and
Contractor on the mitigation measures;
2.
Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
3.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Discuss with IEC on
the proposed mitigation measures;
2.
Make agreement on the
mitigation measures to be implemented;
3.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Inform the Engineer
and confirm notification of the non-compliance in writing;
2.
Rectify unacceptable
practice;
3.
Check work process
and methods;
4.
Consider changes of
working methods or slow down the work process;
5.
Discuss with ET and IEC
and propose mitigation measures to IEC and ER within 3 working days;
6.
Implement the agreed
mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
|
Limit level being
exceeded by one sampling day
|
1.
Repeat in-situ
measurement to confirm findings;
2.
Identify source(s) of
impact;
3.
Inform IEC,
Contractor and EPD;
4.
Check monitoring
data, all work process and Contractor's working methods;
5.
Discuss mitigation measures
with IEC, ER and Contractor;
6.
Ensure mitigation
measures are implemented;
7.
Increase the
monitoring frequency to daily until no exceedance
of Limit Level.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Discuss with ET and
Contractor on the mitigation measures;
2.
Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
3.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Discuss with IEC, ET
and Contractor on the proposed mitigation measures;
2.
Request Contractor to
critically review the working methods;
3.
Make agreement on the
mitigation measures to be implemented;
4.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Inform the Engineer and
confirm notification of the non-compliance in writing;
2.
Rectify unacceptable
practice;
3.
Check all work
process and methods;
4.
Consider changes of
working methods or slow down the work process;
5.
Discuss with ET, IEC and
ER and propose mitigation measures to IEC and ER within 3 working days;
6.
Implement the agreed
mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
|
Limit level being exceeded by more
than one consecutive sampling days
|
1.
Identify source(s) of
impact;
2.
Inform IEC,
Contractor and EPD;
3.
Check monitoring
data, all work process and Contractor's working methods;
4.
Discuss mitigation
measures with IEC, ER and Contractor;
5.
Ensure mitigation
measures are implemented;
6.
Increase the
monitoring frequency to daily until no exceedance
of Limit level for two consecutive days.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1.
Discuss with ET and
Contractor on the mitigation measures;
2.
Review proposals on
mitigation measures submitted by Contractor and advise the ER accordingly;
3.
Assess the
effectiveness of the implemented mitigation measures.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1. Discuss
with IEC, ET and Contractor on the proposed mitigation measures;
2. Request
Contractor to critically review the working methods;
3. Make
agreement on the mitigation measures to be implemented;
4. Assess
the effectiveness of the implemented mitigation measures;
5. Consider
and instruct, if necessary, the Contractor to slow down or to stop all or
part of the marine work until no exceedance of
Limit level.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
1. Inform
the ER and confirm notification of the non-compliance in writing;
2. Rectify
unacceptable practice;
3. Check
all work process and methods;
4. Consider
changes of working methods or slow down the work process;
5. Discuss
with ET , IEC and ER and propose mitigation measures to IEC and ER within 3
working days;
6. Implement
the agreed mitigation measures;
7. As
directed by the Engineer, to slow down or to stop all or part of the marine
work.
(The above actions should be taken within 1
working day after the exceedance is identified)
|
7.9
Red Tide Monitoring Programme and Action Plan
7.9.1
The potential impacts from
red tide or harmful algal blooms (HABs) that may
arise in the KTD area during operational phase will be managed and responded
under the routine red tide monitoring and management protocol and response plan
currently adopted by the government in Hong Kong. AFCD shall be acting as
the coordinator of the Red Tide Reporting Network, to receive reports of red
tide, conduct investigation and provide warning of the risk associated and
appropriate mitigation measures. The objectives of this red tide monitoring
programme are to provide coordination of monitoring and response to red tides/HABs and fish kills and to compile and synthesize data
necessary to effectively manage fisheries resources, protect human health and
the marine ecosystems. Details of the existing red tide monitoring and
management plan are provided in the website (http://www.hkredtide.org/).
An outline of the red tide monitoring and management framework is highlighted
in the subsequent sections for reference.
Information Network
7.9.2
Red Tide Reporting
Network:
Following any sighting of seawater discoloration in the KTD waters as
reported by staff of government departments working at sea as well as the
public and stakeholders of this Project, AFCD shall conduct investigation to
assess the risk involved, issue warnings to marine fish farmer as necessary and
forward the information to concerned departments such as EPD, Food and
Environmental Hygiene Department (FEHD), Leisure and Cultural Services
Department (LCSD) and Department of Health (DH) for appropriate actions.
7.9.3
Phytoplankton
Monitoring Programme:
Routine phytoplankton monitoring is currently carried out by EPD to monitor the phytoplankton populations at 25 stations across the
Hong Kong water including two EPD stations, namely VM4 and VM1 respectively,
close to the KTD area. Under the phytoplankton monitoring programme, monthly samples are collected from one metre below the surface of the water for laboratory analysis
to identify and count the phytoplankton species in each sample, and compare the
results geographically between stations and over time. The aim of the
phytoplankton monitoring programme is to identify
changes in the phytoplankton community and to detect the presence of any toxic
species of phytoplankton.
7.9.4
Routine phytoplankton
monitoring is also carried out by AFCD to detect presence of toxic algae or
development of harmful red tides, in order to provide early warning to mariculturists and other concerned parties.
Phytoplankton samples are collected by AFCD weekly from six core stations (i.e. 1 in Western Buffer
WCZ near Ma Wan, 1 in Southern WCZ near Lama Island, 1 in Port Shelter, 1 in Tolo Harbour and 2 in Mirs Bay)
and fortnightly from five more offshore
stations (1 in North Western WCZ, 2 in Southern WCZ, 1 in Port
Shelter and 1 in Mirs Bay) year round, as well as
five seasonal stations (at Lamma Island, Tung Lung Chau, Tolo
Harbour, Port Shelter and Mirs Bay respectively)
during red tide peak season. Sampling frequency would be stepped up when
harmful algal species or abnormally high phytoplankton population was detected.
7.9.5
Seafood Surveillance
and Report of Human Intoxication: Routine surveillance for biotoxins in seafood
at import control, wholesale and retailed markets is carried out by FEHD. In
addition, FEHD will step up the surveillance in response to the presence of
toxic algae from AFCD's phytoplankton monitoring
programme. Shellfish containing algal toxins exceeding the safety limit will be
confiscated. Cases of human intoxication by shellfish poisons will be reported
to DH. DH with assistance from FEHD will trace the source of incriminated
shellfish and stop the sale of these shellfish.
Departmental Action Plans
7.9.6
The action plans
include the Mariculture Action Plan to be implemented
by AFCD, the Algal Biotoxin Action Plan by FEHD and
DH and the Beach Action Plan by LCSD. The actions taken and monitoring results
are forwarded to AFCD for coordination. Joined press release or conference will
be arranged as needed.
Other Activities
7.9.7
Public Communication
and Education: To
inform the public and mariculturists about the latest
red tide situation, the webpage (http://www.hkredtide.org/)
is updated weekly and press release is issued upon occurrence of red tide. A
set of posters and leaflets on red tide is produced and distributed to public
including understanding of red tide/HAB, impacts of fish culture, implication
on seafood safety and swimming at beach. Webpages
and leaflets on shellfish toxins are published by FEHD.
7.10
Mitigation of Adverse Environmental Impacts
7.10.1
Mitigation measures for
water quality control have been recommended in the EIA Report. The
Contractor should be responsible for the design and implementation of these
measures.
7.10.2
Recommended mitigation
measures to minimize the adverse impacts on water quality during the proposed
dredging are listed in the implementation schedule given in Appendix A4.