CONTENTS
Appendix A Master Programme
Appendix B Overview of Desalination Plant in Tseung Kwan O
Appendix C Baseline Water Quality Monitoring Schedule
Appendix D Baseline Water Quality Monitoring Data
Appendix E HOKLAS Laboratory Certificate
Appendix F Water Quality Monitoring Equipment Calibration Certificate
Introduction
A1. The Project, Design, Build and Operate First Stage of Tseung Kwan O Desalination Plant (TKODP), is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is currently governed by a Further Environmental Permit (EP No. FEP - 01/503/2015/A) for the construction and operation of the Project.
A2. In accordance with the approved Environmental Monitoring and Audit (EM&A) Manual for the Project, baseline environmental monitoring for marine water quality should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL) prior to the commencement of marine construction works. Pursuant to FEP Condition 3.4, Baseline Monitoring Report shall be submitted to the Director within 2 weeks before the commencement of construction of the Project for record.
A3. This is the Baseline Water Quality Monitoring Report, prepared by ASCL, for the Project summarizing the baseline water quality monitoring results at and around Tseung Kwan O Area 137 (TKO 137) during the period from 12 May 2020 to 6 June 2020.
1.1.
BACKGROUND
1.1.1.
The
Jardine Engineering Corporation, Limited, China State Construction Engineering
(Hong Kong) Limited and Acciona Agua, S.A. Trading As AJC Joint Venture (AJCJV)
is contracted to carry out the Design, Build and Operate First Stage of Tseung
Kwan O Desalination Plant (DPTKO) under Contract No. 13/WSD/17 (the Project).
1.1.2.
Acuity
Sustainability Consulting Limited (ASCL) is commissioned by AJCJV to undertake
the Environmental Team (ET) services as required and/or implied, both
explicitly and implicitly, in the Environmental Permit (EP), Environmental
Impact Assessment Report (EIA Report) (Register No. AEIAR-192/2015) and
Environmental Monitoring and Audit Manual (EM&A Manual) for the Project;
and to carry out the Environmental Monitoring and Audit (EM&A) programme in
fulfillment of the EIA Report¡¦s EM&A requirements and Contract No.
13/WSD/17 Specification requirements.
1.1.3.
Pursuant
to the Environmental Impact Assessment Ordinance (EIAO), the Director of
Environmental Protection granted the Environmental Permit (No. EP-01/503/2015)
and Variation of Environmental Permit (No. EP-01/503/2015/A) to Water Supplies
Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/A)
to AJCJV for the Project.
1.1.4.
According
to the approved EM&A Manual, baseline environmental monitoring for marine
water quality should be conducted to review the baseline conditions prior to
the commencement of marine construction works for and establish Action and
Limit Levels.
1.1.5.
Pursuant
to Condition 3.4 of the FEP, the AJCJV shall submit a Baseline Monitoring
Report at least 2 weeks before the commencement of construction of the Project.
1.1.6. The master programme and overall view of TKODP alignment is shown in Appendix A and Appendix B respectively.
1.2.
PURPOSE OF THE BASELINE
WATER QUALITY MONITORING REPORT
1.2.1.
The purposes of
this Baseline Water Quality Monitoring Report are to:
-
Summarise
and present the findings of baseline marine water quality including monitoring
locations, equipment, period, methodology, results and observations: and
-
Establish
the Action and Limit (A/L) levels in accordance with the EM&A Manual for
the subsequent impact monitoring during marine construction stage.
Water Quality
1.2.2.
Baseline
water quality monitoring was carried at thirteen monitoring stations, which are
located at and around TKO 137 area. This Baseline Water Quality Monitoring
Report contains baseline findings of these thirteen monitoring stations.
1.3.
REPORT
STRUCTURE
1.3.1.
This Baseline
Water Quality Monitoring Report comprises the following sections:
-
Section 1 introduces
the background of the Project and purpose of this Report;
-
Section
2 presents the baseline water quality monitoring methodologies, requirements,
results, influencing factors including major site activities and weather
conditions, as well as determination of the action and limit levels of marine
water quality; and
-
Section 3
presents concludes the findings of baseline water quality monitoring.
2.1.
MONITORING REQUIREMENTS
2.1.1.
To
ensure no adverse water quality impact, water quality monitoring is recommended
to be carried out at the nearby
water sensitive receivers (WSRs) during construction phase including dredging
activities and marine construction works.
2.1.2.
In
accordance with the EM&A Manual, baseline water quality monitoring should
be conducted 3 days per week for 4 weeks to obtain background water quality
levels at thirteen monitoring stations. The interval between two sets of
monitoring shall not be less than 36 hours.
2.2.
WATER QUALITY PARAMETERS,
TIME AND FREQUENCY
2.2.1.
Baseline
Marine Water Quality Monitoring was conducted 3 days per week for 4 weeks
between 12 May 2020 and 6 June 2020.
2.2.2.
Dissolved
oxygen (DO), turbidity, suspended solids (SS) levels, salinity, pH and temperature
were monitored at all monitoring stations during mid-flood and mid-ebb tides at
three water depths for Baseline Marine Water Quality Monitoring.
2.2.3. Table 2.1 summarizes the monitoring parameters,
frequency and duration of the baseline water quality monitoring. The monitoring
location/position, time, water depth, sampling depth, tidal stages, weather
conditions, sea conditions, current direction, velocity and any special
phenomena or work underway nearby were also recorded. The monitoring schedule is
provided in Appendix C.
Table 2.1 Water
Quality Monitoring Parameters, Frequency and Duration
Parameter, unit |
Frequency |
No. of Depths |
-
Water Depth(m) -
Temperature(oC) -
Salinity(ppt) -
pH (pH unit) -
Dissolved Oxygen (DO)(mg/L and % of saturation) -
Turbidity(NTU) -
Suspended Solids (SS), mg/L -
Iron -
Current Direction -
Current Velocity
(m/s) |
Baseline water quality monitoring: 3
days per week, at mid-flood and mid-ebb tides, for a period of 4 weeks |
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. |
2.3.
WATER QUALITY MONITORING LOCATIONS
2.3.1.
Monitoring Equipment
For baseline water quality monitoring, the following equipment will be used:
Dissolved Oxygen and Temperature Measuring Equipment - The instrument will be a portable, weatherproof dissolved oxygen measuring instrument complete with cable, sensor, comprehensive operation manuals, and will be operable from a DC power source. It will be capable of measuring: dissolved oxygen levels in the range of 0 - 20 mg/L and 0 - 200% saturation; and a temperature of 0 - 45 degrees Celsius. It shall have a membrane electrode with automatic temperature compensation complete with a cable of not less than 35 m in length. Sufficient stocks of spare electrodes and cables shall be available for replacement where necessary (e.g. YSI model 59 DO meter, YSI 5739 probe, YSI 5795A submersible stirrer with reel and cable or an approved similar instrument).
Turbidity Measurement Equipment - The instrument will be a portable, weatherproof turbidity- measuring unit complete with cable, sensor and comprehensive operation manuals. The equipment will be operated from a DC power source, it will have a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU and will be complete with a cable with at least 35 m in length (for example Hach 2100P or an approved similar instrument).
Salinity Measurement Instrument - A portable salinometer capable of measuring salinity in the range of 0 - 40 ppt will be provided for measuring salinity of the water at each monitoring location.
Water Depth Gauge - A portable, battery-operated echo sounder (for example Seafarer 700 or a similar approved instrument) will be used for the determination of water depth at each designated monitoring station. This unit will preferably be affixed to the bottom of the work boat if the same vessel is to be used throughout the monitoring programme. The echo sounder should be suitably calibrated. The ET shall seek approval for their proposed equipment with the client prior to deployment.
Current Velocity and Direction - No specific equipment is recommended for measuring the current velocity and direction. The environmental contractor shall seek approval of their proposed equipment with the client prior to deployment.
Positioning Device - A Global Positioning System (GPS) shall be used during monitoring to allow accurate recording of the position of the monitoring vessel before taking measurements. The Differential GPS, or equivalent instrument, should be suitably calibrated at appropriate checkpoint (e.g. Quarry Bay Survey Nail) to verify that the monitoring station is at the correct position before the water quality monitoring commence.
Water Sampling Equipment - A water sampler, consisting of a PVC or glass cylinder of not less than two litres, which can be effectively sealed with cups at both ends, will be used (e.g. Kahlsico Water Sampler 13SWB203 or an approved similar instrument). The water sampler will 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.
Total Residual Chlorine for Discharge of Sterilization Water - Total residual chlorine (TRC) shall be measured in-situ using a handheld colorimeter with its testing toolkits.
2.3.2.
Sampling /
Testing Protocols
All in situ monitoring instruments will be checked, calibrated and certified by Australian Laboratory Services (ALS) accredited under HOKLAS or any other international accreditation scheme before use, and subsequently re-calibrated at monthly intervals throughout the stages of the water quality monitoring. Responses of sensors and electrodes will be checked with certified standard solutions before each use. The HOKLAS laboratory certificate was presented in Appendix E.
On-site calibration of field equipment shall follow the ¡§Guide to On-Site Test Methods for the Analysis of Waters¡¨, BS 1427: 2009. Sufficient stocks of spare parts shall be maintained for replacements when necessary. Backup monitoring equipment shall also be made available so that monitoring can proceed uninterrupted even when equipment is under maintenance, calibration etc.
2.3.3.
Laboratory
Measurement and Analysis
All laboratory work shall be carried out in ALS (HOKLAS accredited laboratory). Sufficient volume of each water sample shall be collected at the monitoring stations for carrying out the laboratory analyses. Using chain of custody forms, collected water samples will be transferred to an HOKLAS accredited laboratory for immediate processing. The determination work shall start within the next working day after collection of the water samples. The laboratory measurements shall be provided to the client within 5 working days of the sampling event. Analytical methodology and sample preservation of other parameters will be based on the latest edition of Standard Methods for the Examination of Waste and Wastewater published by APHA, AWWA and WPCF and methods by USEPA, or suitable method in accordance with requirements of HOKLAS or another internationally accredited scheme. The submitted information should include 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. The QA/QC details shall be in accordance with requirements of HOKLAS or another internationally accredited scheme.
Parameters for laboratory measurements, their standard methods and their detection limits are presented in Table 2.2.
Table 2.2 Laboratory
measurements, standard methods and corresponding detection limits of marine
water quality monitoring
Parameters |
Standard Methods |
Detection Limit |
Reporting Limit |
Precision |
Dissolved oxygen (mg/L) |
Instrumental, CTD |
0.1 |
- |
¡Ó25% |
Temperature (oC) |
Instrumental, CTD |
0.1 |
- |
¡Ó25% |
pH |
Instrumental, CTD |
0.1 |
- |
¡Ó25% |
Turbidity (NTU) |
Instrumental, CTD |
0.1 |
- |
¡Ó25% |
Salinity (0/00) |
Instrumental, CTD |
0.1 |
- |
¡Ó25% |
Suspended Solids (mg/L) |
APHA 17th Ed 2540D |
1.0 |
2.0 |
¡Ó25% |
Iron-soluble |
USEPA 6010C NOTE 1 |
0.2NOTE1 |
0.2NOTE1 |
¡Ó25%NOTE1 |
NOTE1: The testing methods, Quality Assurance/Quality Control (QA/QC) details, detection limits and accuracy shall be submitted to EPD for approval prior to the commencement of monitoring programme.
2.3.4.
Monitoring
Location
The water quality monitoring locations for baseline in accordance to the EM&A Manual and Contract Specification are shown in Figure 2.1 and detailed in Table 2.3 below. A schedule for water quality monitoring shall be prepared by the ET and approved by IEC and EPD prior to the commencement of the monitoring.
Table 2.3 Location of Baseline Water Quality Monitoring Station
Station |
Easting |
Northing |
Description |
|
CE |
843550 |
815243 |
Upstream control station at ebb tide |
|
CF |
846843 |
810193 |
Upstream control station at flood tide |
|
WSR1 |
846864 |
812014 |
Ecological sensitive receiver at Tung Lung Chau |
|
WSR2 |
847645 |
812993 |
Fisheries sensitive receiver at Tung Lung Chau |
|
WSR3 |
848023 |
813262 |
Ecological sensitive receiver at Tung Lung Chau |
|
WSR4 |
847886 |
814154 |
Ecological sensitive receiver at Tai Miu Wan |
|
WSR16 |
845039 |
815287 |
Ecological sensitive receiver at Fat Tong Chau |
|
WSR33 |
847159 |
814488 |
Ecological sensitive receiver at Tai Miu Wan |
|
WSR36 |
846878 |
814081 |
Ecological sensitive receiver at Kwun Tsai |
|
WSR37 |
846655 |
813810 |
Ecological sensitive receiver at Tit Cham Chau |
|
NF1 |
846542 |
813614 |
Edge of mixing zone, ~ 200m west of outfall diffuser |
|
NF2 |
846942 |
813614 |
Edge of mixing zone, ~ 200m east of outfall diffuser |
|
NF3 |
846742 |
813414 |
Edge of mixing zone, ~ 200m south of outfall diffuser |
WSR1 to WSR37 were identified in accordance with Annex 14 of the EIAO-TM as well as Clause
3.4.4.2 of the Environmental Impact Assessment Study Brief for Desalination Plant at Tseung Kwan O (No. ESB-266/2013). WSR1 to WSR3 are sited near the Tung Lung Chau Fish Culture Zone; WSR16 and WSR36 are sited near the coral assemblages along the coastlines of Fat Tong Chau and Kwun Tsai respectively; WSR 4 and WSR33 are sited near the Coastal Protection Area and coral assemblages in waters of Tai Miu Wan; WSR37 is sited near the fisheries resource including spawning and nursery grounds at the coastal water of Tit Cham Chau.
2.4.
IN-SITU MEASUREMENT
2.4.1. Levels of DO, pH, temperature,
turbidity and salinity would be measured in-situ by portable and weatherproof measuring
instrument, e.g. Horiba U-53 Multiparameter complete with cable and sensor.
(Refer to https://www.horiba.com/fileadmin/uploads/Process-
Environmental/Documents/Downloads_Catalog/Catalog_Water_Quality/U-
50_brochure_en_HRE1930E.pdf for Horiba U-53 technical specification). Water current velocity
and Water Current direction would be measured by portable and weatherproof
current meter, e.g. Valeport Current Meter Model 106 (Refer to https://www.indomultimeter.com/Pdf/Valeport-Model-106-Manual.pdf for Valeport Current
Meter Model 106 Manual). The calibration certificates are presented in Appendix
F.
Figure 2.1 Baseline water
quality monitoring locations under EM&A Manual
2.4.2.
Sampling
Frequency
The measurements shall be taken at all designated monitoring stations including control stations, once per day for a minimum of 3 days per week for 4 weeks prior to the commencement of the construction works. Measurements shall be taken at each station at any time. The interval between two sets of monitoring shall not be less than 36 hours. No construction activities were conducted in the vicinity of the stations during the baseline water quality monitoring.
2.4.3.
Sampling Depths
& Replication
For baseline water quality monitoring, each station was sampled and measurements/ water samples would be taken at three depths, 1 m below the sea surface, mid-depth and 1 m above the seabed. For stations that are less than 3 m in depth, only the mid depth sample shall be taken. For stations that are less than 6 m in depth, only the surface and seabed sample shall be taken. For in situ measurements, duplicate readings shall be made at each water depth at each station. Duplicate water samples shall be collected at each water depth at each station.
2.5.
MAINTENANCE AND CALIBRATION
2.5.1.
The
multi-functional meters were checked and calibrated before use.
Multi-functional meters were certified by a laboratory accredited under HOKLAS
or any other international accreditation scheme, and subsequently re-calibrated
at monthly intervals throughout all stages of the water quality monitoring.
Responses of sensors and electrodes were checked with certified standard
solutions before each use.
2.5.2.
The calibration
certificates of monitoring equipment were presented in Appendix F.
2.5.3.
Sufficient
stocks of spare parts were provided and maintained for replacements when
necessary. Backup monitoring equipment was prepared for uninterrupted
monitoring during equipment maintenance or calibration during monitoring.
2.6.
RESULTS AND OBSERVATIONS
2.6.1. The baseline marine water quality monitoring was conducted from 12 May 2020 to 6 Jun 2020 at all thirteen monitoring stations. The monitoring results are summarized in Table 2.4. Details of water quality monitoring results are presented in Appendix D.
2.6.2.
The
weather conditions during the monitoring period were mainly sunny and cloudy.
Sea conditions for the majority of monitoring days were either slight, calm or
moderate. The data of 30 May 2020 and 6 June 2020 were collected under heavy
rain. The data measured and sampled on 6 June 2020 were not used as baseline
reference as agreed with the IEC. No construction activity, major pollution
source and extreme weather, except 6 June 2020, which might affect the results
were observed during the baseline water quality monitoring.
2.6.3.
There
is no significant difference between control and impact stations for the
parameters monitored.
2.6.4.
As
the southern water is affected by seasonal changes, the baseline water quality
monitoring has not taken into account the seasonal variations for determination
of Action and Limit Level for WQM. Therefore, during the future impact
monitoring, the water quality monitoring results at the control points shall
serve as a reference to determine if any elevated concentration of the
monitored parameter is due to seasonal variation or project contribution.
Revision on derivation criteria of the Action and Limit Level for WQM has
therefore been made as specified in Table 2.6 of the report.
Table 2.4 Summary
of Baseline Water Quality Monitoring Results
Location |
Parameters |
||||||||
Salinity (ppt) |
Dissolved Oxygen
(mg/L) note i |
pH |
Turbidity (NTU) |
Suspended solids (mg/L) |
Temperature (¢XC) |
Iron (mg/L) |
|||
Surface & Middle |
Bottom |
||||||||
CE |
Avg. |
31.40 |
8.61 |
8.70 |
8.24 |
1.6 |
3.32 |
26.9 |
<
0.10 |
Min. |
28.85 |
5.75 |
5.00 |
7.99 |
0.5 |
2.00 |
24.7 |
< 0.10 |
|
Max. |
33.29 |
10.02 |
10.85 |
8.75 |
4.7 |
13.00 |
29.2 |
< 0.10 |
|
CF |
Avg. |
31.39 |
8.71 |
8.71 |
8.24 |
1.6 |
3.53 |
27.0 |
<
0.10 |
Min. |
29.75 |
6.71 |
6.90 |
8.01 |
0.7 |
2.00 |
24.6 |
<
0.10 |
|
Max. |
32.75 |
10.34 |
10.39 |
8.79 |
2.7 |
12.00 |
29.2 |
<
0.10 |
|
WSR1 |
Avg. |
31.41 |
8.83 |
8.76 |
8.24 |
1.5 |
3.53 |
27.1 |
<
0.10 |
Min. |
29.71 |
6.96 |
7.00 |
8.00 |
0.8 |
2.00 |
25.1 |
<
0.10 |
|
Max. |
32.81 |
10.31 |
10.17 |
8.79 |
2.9 |
13.00 |
29.4 |
<
0.10 |
|
WSR2 |
Avg. |
31.44 |
8.72 |
8.68 |
8.24 |
1.5 |
3.55 |
27.1 |
<
0.10 |
Min. |
29.76 |
6.89 |
6.70 |
8.01 |
0.8 |
2.00 |
25.2 |
<
0.10 |
|
Max. |
32.93 |
10.31 |
10.19 |
8.74 |
2.7 |
12.00 |
29.3 |
<
0.10 |
|
WSR3 |
Avg. |
31.45 |
8.66 |
8.62 |
8.27 |
1.5 |
3.69 |
27.0 |
<
0.10 |
Min. |
29.65 |
6.34 |
5.73 |
8.01 |
0.3 |
2.00 |
25.1 |
<
0.10 |
|
Max. |
34.00 |
10.19 |
9.90 |
8.81 |
4.1 |
14.00 |
29.3 |
<
0.10 |
|
WSR4 |
Avg. |
31.41 |
8.84 |
8.71 |
8.26 |
1.6 |
3.46 |
27.1 |
<
0.10 |
Min. |
29.15 |
7.22 |
6.96 |
8.01 |
0.5 |
2.00 |
25.0 |
<
0.10 |
|
Max. |
34.22 |
11.34 |
10.18 |
8.83 |
4.2 |
14.00 |
29.3 |
<
0.10 |
|
WSR16 |
Avg. |
31.42 |
8.79 |
8.81 |
8.24 |
1.6 |
3.42 |
27.0 |
<
0.10 |
Min. |
30.04 |
6.72 |
6.82 |
8.01 |
0.7 |
2.00 |
24.9 |
<
0.10 |
|
Max. |
32.96 |
10.38 |
9.99 |
8.80 |
2.8 |
12.00 |
29.2 |
<
0.10 |
|
WSR33 |
Avg. |
31.36 |
8.90 |
8.84 |
8.25 |
1.5 |
3.44 |
27.1 |
<
0.10 |
Min. |
28.70 |
6.35 |
6.45 |
8.00 |
0.5 |
2.00 |
25.0 |
<
0.10 |
|
Max. |
33.52 |
11.44 |
10.76 |
9.17 |
4.5 |
11.00 |
29.4 |
<
0.10 |
|
WSR36 |
Avg. |
31.37 |
8.68 |
8.68 |
8.25 |
1.5 |
3.43 |
27.1 |
<
0.10 |
Min. |
27.88 |
6.13 |
6.59 |
8.01 |
0.5 |
2.00 |
24.9 |
<
0.10 |
|
Max. |
33.57 |
10.42 |
10.55 |
8.87 |
2.8 |
14.00 |
29.4 |
<
0.10 |
|
WSR37 |
Avg. |
31.49 |
8.72 |
8.71 |
8.25 |
1.5 |
3.29 |
27.1 |
<
0.10 |
Min. |
29.80 |
5.86 |
6.22 |
8.01 |
0.2 |
2.00 |
24.9 |
<
0.10 |
|
Max. |
32.91 |
10.06 |
10.25 |
8.93 |
3.2 |
10.00 |
29.2 |
<
0.10 |
|
NF1 |
Avg. |
31.48 |
8.76 |
8.93 |
8.24 |
1.5 |
3.35 |
27.0 |
<
0.10 |
Min. |
29.89 |
6.64 |
6.87 |
8.01 |
0.5 |
2.00 |
24.4 |
< 0.10 |
|
Max. |
33.78 |
10.44 |
11.30 |
9.00 |
4.3 |
11.00 |
29.2 |
< 0.10 |
|
NF2 |
Avg. |
31.46 |
8.81 |
8.73 |
8.26 |
1.5 |
3.34 |
27.1 |
<
0.10 |
Min. |
29.75 |
6.74 |
6.38 |
8.01 |
0.4 |
2.00 |
25.2 |
<
0.10 |
|
Max. |
33.58 |
12.07 |
10.56 |
8.97 |
2.8 |
10.00 |
29.3 |
<
0.10 |
|
Location |
Parameters |
||||||||
Salinity (ppt) |
Dissolved
Oxygen (mg/L)
note
i |
pH |
Turbidity (NTU) |
Suspended solids (mg/L) |
Temperature (¢XC) |
Iron (mg/L) |
|||
Surface & Middle |
Bottom |
||||||||
NF3 |
Avg. |
31.46 |
8.83 |
8.85 |
8.25 |
1.5 |
3.22 |
27.1 |
<
0.10 |
Min. |
29.62 |
6.87 |
6.99 |
8.01 |
0.4 |
2.00 |
25.1 |
<
0.10 |
|
Max. |
34.10 |
11.89 |
12.63 |
8.83 |
2.9 |
10.00 |
29.3 |
< 0.10 |
Notes:
i.
"Avg",
¡§Min¡¨ and ¡§Max¡¨ is the average, minimum and maximum respectively of the data
from measurements conducted under mid- flood and mid-ebb tides at three water
depths, except that of DO where the data for ¡§Surface & Middle¡¨ and
¡§Bottom¡¨ are calculated separately.
2.7.
ACTION AND LIMIT LEVELS
2.7.1.
The Action and
Limit Levels have been set based on the derivation criteria specified in the
EM&A Manual as shown in Table 2.5 below.
Table 2.5 Criteria
of Action and Limit Levels for Water Quality
Parameters |
Action |
Limit |
Construction Phase Impact Monitoring |
||
DO in mg/L |
Surface and Middle 5%-ile of baseline data for surface and middle
layer Bottom 5%-ile of baseline data for bottom layers Tung Lung Chau Fish Culture Zone 5.1 mgL-1 or level at control station (whichever the
lower) |
Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone 5.0 mgL-1 or level at control station (whichever the lower) |
SS in mg/L (Depth- averaged) |
≥ 95 %-ile of baseline data or 20% exceedance
of value at any impact station compared with corresponding data from control
station |
≥ 99 %-ile of baseline data or 30% exceedance
of value at any impact station compared with corresponding data from control
station |
Turbidity in NTU (Depth-averaged) |
≥ 95 %-ile of baseline data or 20% exceedance
of value at any impact station compared with corresponding data from control
station |
≥ 99 %-ile of baseline data or 30% exceedance
of value at any impact station compared with corresponding data from control
station |
First-year Operation Phase Monitoring |
||
DO in mg/L |
Surface and Middle 5%-ile of baseline data for surface and middle
layer Bottom 5%-ile of baseline data for bottom layers Tung Lung Chau Fish Culture Zone 5.1 mgL-1 or level at control station (whichever the lower) |
Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone 5.0 mgL-1 or level at control station (whichever the
lower) |
SS in mg/L (Depth- averaged) |
≥ 95 %-ile of baseline data or 20% exceedance
of value at any impact station compared with corresponding data from control
station |
≥ 99 %-ile of baseline data or 30% exceedance
of value at any impact station compared with corresponding data from control
station |
Turbidity in NTU (Depth-averaged) |
≥ 95 %-ile of baseline data or 20% exceedance
of value at any impact station compared with corresponding data from control
station |
≥ 99 %-ile of baseline data or 30% exceedance
of value at any impact station compared with corresponding data from control
station |
Salinity in PSU (Depth-averaged) |
109% of baseline level or 9% exceedance of
value at any impact station compared with corresponding data from control station |
110% of baseline level or 10% exceedance of
value at any impact station compared with corresponding data from control
station |
Iron in mg/L (Depth-averaged) |
0.3 mgL-1 |
0.3 mgL-1 |
2.7.2.
Based on the
baseline water quality monitoring data and the derivation criteria specified
above, the Action/Limit Levels have been derived and are presented in Table 2.6.
Table 2.6 Derived
Action and Limit Levels for Water Quality
Parameters |
Action |
Limit |
|
Construction Phase Impact Monitoring |
|
||
DO in mg/L |
Surface and Middle 7.30
mg L-1 Bottom 7.31
mg L-1 Tung Lung Chau Fish Culture Zone 5.1 mgL-1 or level at control station (whichever the
lower) |
Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone 5.0 mgL-1 or level at control station (whichever the
lower) |
|
SS in mg/L (Depth-averaged) |
5.00
mg L-1 or 20% exceedance of value at
any impact station compared with corresponding data from control station |
6.00
mg L-1 or 30% exceedance of value at
any impact station compared with corresponding data from control station |
|
Turbidity in NTU (Depth-averaged) |
2.41 NTU or 20% exceedance of
value at any impact station compared with corresponding data from control station |
2.84 NTU or 30% exceedance of
value at any impact station compared with corresponding data from control station |
|
First-year Operation Phase Monitoring iv |
|
||
DO in mg/L |
Surface and Middle 7.30
mg L-1 Bottom 7.31
mg L-1 Tung Lung Chau Fish Culture Zone 5.1 mgL-1 or level at control station (whichever the
lower) |
Surface and Middle 4 mg L-1 Bottom 2 mg L-1 Tung Lung Chau Fish Culture Zone 5.0 mgL-1 or level at control station (whichever the
lower) |
|
SS in mg/L (Depth-averaged) |
5.00
mg L-1 or 20% exceedance of value at
any impact station compared with corresponding data from control station |
6.00
mg L-1 or 30% exceedance of value at
any impact station compared with corresponding data from control station |
|
Turbidity in NTU (Depth-averaged) |
2.41 NTU or 20% exceedance of value
at any impact station compared with corresponding data from control station |
2.84 NTU or 30% exceedance of
value at any impact station compared with corresponding data from control
station |
|
Salinity in PSU (Depth-averaged) |
34.28 PSU or 9% exceedance of
value at any impact station compared with corresponding data from control station |
34.60 PSU or 10% exceedance of
value at any impact station compared with corresponding data from control station |
|
Iron in mg/L (Depth-averaged) |
0.3 mgL-1 |
0.3 mgL-1 |
Notes:
i.
"Depth-averaged"
is calculated by taking the arithmetic means of reading of all three depths.
ii.
For
DO, non-compliance of the water quality limits occurs when monitoring result is
lower than the limits.
iii.
For Turbidity, SS, iron and Salinity,
non-compliance of the water quality limits occurs when monitoring result is
higher than the limits.
iv.
For
the Action and Limit Levels adopted during First-year Operation Phase
Monitoring, further review would be made according to the EM&A Manual
during Operation Phase.
3.1.
REVISION FOR INCLUSION
IN THE EM&A DOCUMENTS
3.1.1. The baseline environmental
monitoring was conducted according to the EM&A Manual. The monitoring methodology,
parameters monitored, and monitoring locations are all in line with the
EM&A Manual for the Project.
3.2.
WATER QUALITY
3.2.1.
Baseline
marine water quality monitoring was conducted between 12 May 2020 to 6 Jun 2020
at thirteen monitoring stations. All monitoring stations as specified in
EM&A Manual were accessible and thus there is no revision for inclusion in
the EM&A Manual.
3.2.2. No major pollution sources affecting
the water quality baseline monitoring at the thirteen monitoring stations were observed.
3.2.3. Action and Limit Levels were derived
based on the baseline water quality monitoring results according to the
EM&A Manual.
Appendix A
Master
Programme
Appendix B
Overview of Desalination Plant in Tseung Kwan O
Appendix C
Baseline Water
Quality Monitoring Schedule
Baseline Monitoring Schedule for DPTKO |
||||||
May-20 |
||||||
Sun |
Mon |
Tue |
Wed |
Thu |
Fri |
Sat |
|
|
|
|
|
1 |
2 |
|
|
|
|
|
|
|
3 |
4 |
5 |
6 |
7 |
8 |
9 |
|
|
|
|
|
|
|
10 |
11 |
12 |
13 |
14 |
15 |
16 |
|
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 12:04 - 21:03 Flood Tide: 05:25 - 12:04 Monitoring Time: Mid-ebb: 14:48 - 18:18 *
Mid-flood: 08:00 - 11:30 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb Tide:
13:41 - 22:09 Flood Tide: 07:00 - 13:41 Monitoring Time: Mid-ebb: 14:06 -
17:36 Mid-flood:
08:35 - 12:05 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 07:12 - 11:00 Flood Tide: 11:00 - 16:12 Monitoring Time: *# Mid-ebb: 08:00 - 11:00 Mid-flood:
11:51 - 15:21 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
|
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 08:02 - 13:50 Flood Tide: 13:50 - 19:47 Monitoring Time: Mid-ebb:
09:11 - 12:41 Mid-flood:
15:03 - 18:33 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 08:33 - 15:03 Flood Tide: 15:03 - 21:22 Monitoring Time: Mid-ebb:
10:03 - 13:33 Mid-flood:
15:21 - 18:51 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 09:12 - 16:18 Flood Tide: 16:18 - 22:47 Monitoring Time: Mid-ebb:
11:00 - 14:30 &
Mid-flood: 16:20 - 19:00 |
24 |
25 |
26 |
27 |
28 |
29 |
29 |
|
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 11:00 - 18:28 Flood Tide: 03:44 - 11:00 Monitoring Time: Mid-ebb: 12:59 - 16:29 * Mid-flood:
08:00 - 11:00 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 11:29 - 20:21 Flood Tide: 04:41 - 11:29 Monitoring Time: Mid-ebb: 14:10 - 17:40 *
Mid-flood: 08:00 - 11:30 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 14:07 - 22:19 Flood Tide: 07:46 - 14:07 Monitoring Time: Mid-ebb: 14:31 -
18:01 Mid-flood:
09:11 - 12:41 |
30 |
31 |
|
|
|
|
|
|
|
|
|
|
|
|
Note: * - Due to safty
concern, Water Quality Monitoring would start at 0800. &
- Due to safety concern for sampling event in night-time, Water Quality
Monitoring would end at 1900. # -
The difference of tidal range closest to 0.5m is selected
as far as practicable. |
Baseline Monitoring Schedule for DPTKO |
||||||
Jun-20 |
||||||
Sun |
Mon |
Tue |
Wed |
Thu |
Fri |
Sat |
|
1 |
2 |
3 |
4 |
5 |
6 |
|
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 06:52 - 12:03 Flood Tide: 12:33 - 19:00 Monitoring Time: * Mid-ebb: 08:00 -
11:30 Mid-flood:
14:01 - 17:31 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 07:52 - 14:00 Flood Tide: 14:00 - 21:16 Monitoring Time: Mid-ebb: 09:11 -
12:41 Mid-flood:
14:21 - 17:51 |
|
Baseline Water
Quality monitoring at CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36, WSR37,
NF1, NF2, NF3, P1, P2, G1, G2, R1 & R2 Tidal Period: Ebb
Tide: 09:00 - 16:00 Flood Tide: 16:00 - 23:00 Monitoring Time: Mid-ebb: 10:45 - 14:15 &
Mid-flood: 16:00 - 19:00 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
|
|
|
|
|
|
|
14 |
15 |
16 |
17 |
18 |
19 |
20 |
|
|
|
|
|
|
|
21 |
22 |
23 |
24 |
25 |
26 |
27 |
|
|
|
|
|
|
|
28 |
29 |
30 |
|
|
|
|
|
|
|
|
|
|
|
Note: * - Due to safty concern,
Water Quality Monitoring would start at 0800. &
- Due to safety concern for sampling event in night-time, Water Quality
Monitoring would end at 1900. # -
The difference of tidal range closest to 0.5m is selected
as far as practicable. |
||||||
|
Appendix D
Baseline Water Quality Monitoring Data
Location |
Date |
Weather |
Sea Condition |
Tidal |
Water Level |
Depth (m) |
Time |
DO (mg/L) |
pH |
Sal (ppt) |
Temp (¢XC) |
Turbidty (NTU) |
SS (mg/L) |
Iron (mg/L) |
Current Velocity (m/s) |
Current Direction (NSWE) |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
11.1 |
8:39 |
9.31 |
8.06 |
31.92 |
24.77 |
2.37 |
4 |
<0.10 |
0.175 |
NW |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
11.1 |
8:39 |
8.27 |
8.16 |
31.58 |
24.79 |
1.89 |
3 |
<0.10 |
0.177 |
NW |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Middle |
6.05 |
8:40 |
8.3 |
8.15 |
31.27 |
24.73 |
2.51 |
2 |
<0.10 |
0.186 |
NW |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Middle |
6.05 |
8:40 |
8.19 |
8.24 |
31.45 |
24.73 |
2.37 |
2 |
<0.10 |
0.18 |
NW |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Surface |
1 |
8:41 |
7.8 |
8.14 |
31.38 |
24.91 |
2.23 |
<2 |
<0.10 |
0.204 |
NW |
CE |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Surface |
1 |
8:41 |
9.21 |
8.24 |
31.6 |
24.76 |
2.11 |
<2 |
<0.10 |
0.175 |
N |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
11.3 |
8:03 |
8.13 |
8.18 |
31.74 |
24.86 |
2.01 |
5 |
<0.10 |
0.195 |
SW |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
11.3 |
8:03 |
8.49 |
8.01 |
31.39 |
24.74 |
1.54 |
5 |
<0.10 |
0.138 |
SW |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Middle |
6.15 |
8:04 |
9.11 |
8.15 |
31.16 |
24.66 |
2.41 |
3 |
<0.10 |
0.135 |
W |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Middle |
6.15 |
8:04 |
8.59 |
8.1 |
31.5 |
24.61 |
2.54 |
4 |
<0.10 |
0.154 |
NW |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Surface |
1 |
8:05 |
9.42 |
8.06 |
31.25 |
24.72 |
2.17 |
2 |
<0.10 |
0.164 |
W |
CF |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Surface |
1 |
8:05 |
7.56 |
8.22 |
31.55 |
24.93 |
2.34 |
2 |
<0.10 |
0.189 |
W |
NF1 |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
7.2 |
9:21 |
8.86 |
8.2 |
31.77 |
25.22 |
1.38 |
2 |
<0.10 |
0.158 |
SW |
NF1 |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Bottom |
7.2 |
9:21 |
8.2 |
8.04 |
31.1 |
25.22 |
1.66 |
2 |
<0.10 |
0.13 |
W |
NF1 |
20200512 |
Sunny |
Moderate |
Mid-Flood |
Middle |
4.1 |
9:22 |
8.37 |
8.13 |
31.89 |