Revision History
|
Rev. |
Description of Modification |
Date |
|
1. |
First Issue for Comments |
22/08/2023 |
|
2. |
Second Issue for Comments |
29/08/2023 |
|
Rev. |
Description of Modification |
Date |
|
1. |
First Issue for Comments |
22/08/2023 |
|
2. |
Second Issue for Comments |
29/08/2023 |
CONTENTS
Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions 24
|
Appendix A |
Master Programme |
|
Appendix B |
Overview of Desalination Plant in Tseung Kwan O |
|
Appendix C |
Summary of Implementation Status of Environmental Mitigation |
|
Appendix D |
Water Quality Monitoring Graphical Presentation |
|
Appendix E |
Summary of Exceedances |
|
Appendix F |
Waste Flow Table |
|
Appendix G |
Complaint Log |
|
Appendix H |
Event/Action Plan for Water Quality Monitoring |
|
Appendix I |
Event/Action Plan for Construction Noise Exceedance |
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 Contract.
A2. In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Contract, EM&A works for marine water quality, noise, waste management and ecology should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Contract.
A3. This is the 13th Quarterly EM&A Report, prepared by ASCL, for the Contract summarizing the monitoring results and audit findings of the EM&A programme at and around Tseung Kwan O Area 137 (TKO 137) during the reporting period from 1 March 2023 to 31 May 2023.
A4. The EM&A programme for this contract has covered environmental monitoring on construction noise level at selected NSRs and Contractor’s environmental performance auditing in the aspects of construction dust, construction noise, water quality, waste management, Landscape and Visual and Ecology.
Summary of Main Works Undertaken & Key Mitigation Measures Implemented
A5. Key activities carried out in this reporting period for the Project included the followings:
|
Administration Building - Installation of glass balustrade, metal cladding, building services, electrical switchboard, lift, cable laying - carrying out interior finishes at 2/F, 3/F and 4/F - Construction of staircase - Construction of block wall in the pipe duct. |
|
Chemical building - Installation of handrail, permanent doors, building services, mechanical equipment, and cable laying - Construction of staircase - Underground utility construction work |
|
Main Electrical & Central Chiller Plant Building - Construction of fuel tank room - Installation metal Doors, chillers, building services, electrical switchboard, cable laying |
|
ActiDAFF - Underground utility construction work - Laying of roof floor screed and tiles |
|
- Construction of plinths for saturator tanks - Erection and dismantling of scaffolding, installation of mechanical equipment and piping, bubble test - Installation of underdrain |
|
Product Water Storage Tank Building - Resin Injection Work & Water Test for 1 Water Tanks - Installation of cat ladders in Water Tanks, and door -
Installation of louvres, metal
cladding, building services, cable
laying, mechanical equipment, steel pipe - Underground utility construction |
|
OSCG Building - Installation of Design for Manufacturing and Assembly Panel and metal door - Underground utility construction work - Installation of building services and mechanical equipment |
|
Reverse Osmosis Building - Installation of Design for Manufacturing and Assembly Panels at East Sides - Installation of metal door, metal cladding, hand railings, Louvres & Windows - Installation of building services, electrical switchboard, mechanical equipment, steel pipe, Glass Reinforced Plastics (GRP) pipe and cable laying - Underground utility construction work |
|
Post Treatment Building - Installation of Louvres & Windows, metal door and cat ladders - Installation of Design for Manufacturing and Assembly Panels - Installation of building services, mechanical equipment and GRP pipe - Underground utility construction work |
|
Inspection corridor - Construction of bondek for segments 7 - construction of staircase 8 |
|
CO2 Tanks - Installation of pipes and building services Outfall Shaft -
GRP Diffuser Pipe
installation and rock
material back fill - Dredging for diffuser pipe; Glass Reinforced Plastics Diffuser Pipe installation; rock material back fill - Shafts backfill rock and excavation and lateral support (ELS) removal Combined Shaft -
Installation of building services, electrical equipment, switchboard, cable laying, mechanical equipment and pipes,
stoplogs and band
screens - Underground utility construction work -
Staircases and internal finishing - Waterproofing works |
|
Pump room - internal finishing and screeding Other -
Excavation at slope
toe and access
erection, Soil anchor
and grouting construction -
Foundation & structure construction at Elevated Walkway - Watermain works at CLP 132 kV Substation -
Concrete Breaking, Structure Construction at Seawall - Rock anchor installation; rock drilling, grouting |
A6. The major environmental impacts brought by the above construction works include:
- Construction dust and noise generation from marine construction works, excavation works, excavation works, construction works, rock cutting works and pipe pilling driving works;
- Waste generation from the construction activities
- Impact on water quality from marine construction works and inland construction works
A7. The key environmental mitigation measures implemented for the Project in this reporting period associated with the above construction works include:
- Dust suppression by regular wetting and water spraying for construction works;
- Reduction of noise from equipment and machinery on-site and regularly inspection to machinery and plants/vehicles on-site to ensure proper functioning;
- Sorting and storage of general refuse and construction waste; and
- Deployment of temporary silt curtain in the area where marine construction works were conducted and deployment of water sedimentation tanks for treatment of wastewater at inland areas before discharge
Summary of Exceedance & Investigation &
Follow-up
A8. No noise monitoring was conducted during the reporting period since there are no project- related construction activities undertaken within a radius of 300m from the monitoring locations. No exceedance of the Action Level was recorded during the reporting period.
A9. The EM&A works for water quality were conducted during the reporting period in accordance with the EM&A Manual.
A10. Water quality monitoring was conducted as scheduled in the reporting period. One hundred and twenty-nine (129) action level exceedances and one hundred and six (106) limit level exceedances for suspended solids (SS) of impact water quality monitoring were recorded in the reporting period. All action and limit level exceedances were concluded non-project related.
A11. In this reporting period, 146 times of landfill gas monitoring were recorded at Wan Po Road (Ch0+390 - Ch0+780). No action and limit level exceedance for methane, oxygen and carbon dioxide was recorded.
A12. Weekly site inspections of the construction works were also carried out by ET to audit the mitigation measures implementation status. Thirteen (13) times of weekly Joint site inspections were carried out by ET and IEC.
A13. A summary of the EM&A activities in this reporting period is listed in Table I and summary of the environmental exceedance of the reporting period is tabulated in Table II.
|
EM&A Activities |
Mar 2023 |
Apr 2023 |
May 2023 |
|
Noise Monitoring |
N/A |
N/A |
N/A |
|
Water Quality Monitoring |
2, 5, 7, 9, 11, 14, 16, 18, 21, 23, 25, 28 and 30 March 2023 |
1, 4, 6, 8, 11, 13, 15, 18, 20, 22, 25, 27 and 29 April 2023 |
2, 4, 6, 9, 11, 13, 16, 18, 20, 23, 25, 27 and 30 May 2023 |
|
Landfill Gas monitoring |
1, 2, 3, 4, 6, 7, 8, 9, 10, 11, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 27, 28, 29, 30 and 31 March 2023 |
3, 4, 6, 11, 23, 13, 14, 15, 17, 18, 19, 20, 21, 22, 24, 25, 26, 27, 28, 29 April 2023 |
2, 3, 4, 5, 6, 8, 9, 10, 11, 12, 13, 15, 16, 17, 18, 19, 20, 22, 23,24, 25, 26, 27, 29, 30 and 31 May 2023 |
|
Environmental Site Inspection |
7, 14, 22 and 31 March 2023 |
4, 11, 18 and 24 April 2023 |
2, 9, 16, 23 and 30 May 2023 |
Table II Summary Table
for Exceedance in the Reporting Period
|
Environmental Monitoring |
Parameter |
No. of non-
Project related exceedance |
Total No. of non-Project related exceedance |
No. of Project related exceedance |
Total No. of
Project related exceedance |
||
|
AL |
LL |
AL |
LL |
||||
|
Noise |
Leq (30min) |
N/A |
N/A |
N/A |
N/A |
N/A |
N/A |
|
Water |
DO |
0 |
0 |
0 |
0 |
0 |
0 |
|
Turbidity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
SS |
129 |
106 |
235 |
0 |
0 |
0 |
|
|
pH |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Salinity |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
Landfill Gas |
O2 |
0 |
0 |
0 |
0 |
0 |
0 |
|
CH4 |
0 |
0 |
0 |
0 |
0 |
0 |
|
|
CO2 |
0 |
0 |
0 |
0 |
0 |
0 |
|
Complaint Handling and
Prosecution
A14. No environmental complaint, notifications of summons or prosecution was received during the reporting period.
Reporting Change
A15. There was no change to be reported that may affect the on-going EM&A programme.
BASIC PROJECT INFORMATIONThe Acciona Agua, S.A. Trading, Jardine Engineering Corporation Limited and China State Construction Engineering (Hong Kong) Limited and 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 Contract).
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 Contract; 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.
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 Contract.
This is the 13th Quarterly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 March 2023 to 31 May 2023.
The Project Organization structure for Construction Phase is presented in Figure 1.1.
Contact details of the key personnel are presented in Table 1.1 below:
Table 1.1 Contact Details
of Key Personnel
|
Party |
Position |
Name |
Telephone no. |
|
Project Proponent |
SE/CM2 |
Milton Law |
2634-3573 |
|
Supervising Officer (Binnies Hong Kong Limited) |
Project Manager |
Christina Ko |
2608-7302 |
|
Chief Resident Engineer |
Roger Wu |
6343-1002 |
|
|
The Jardine Engineering Corporation, Limited, China State Construction Engineering (Hong Kong) Limited and Acciona Agua, S.A. Trading |
Project Manager |
Stephen Yeung |
2807-4665 |
|
Environmental Monitoring Manager |
Brian Kam |
9456-9541 |
|
|
Acuity Sustainability Consulting Limited |
Environmental Team Leader |
Jacky Leung |
2698-6833 |
|
ANewR Consulting Limited |
Independent Environmental Checker (IEC) |
Louis Kwan |
2618-2831 |
Details of the major construction activities undertaken in this reporting period are shown as below. The construction programme is presented in Appendix A.
|
Administration Building - Installation of glass balustrade, metal cladding, building services, electrical switchboard, lift, cable laying - carrying out interior finishes at 2/F, 3/F, and 4/F - Construction of staircase - Construction of block wall in the pipe duct. |
|
Chemical building - Installation of handrail, permanent doors, building services, mechanical equipment, and cable laying - Construction of staircase - Underground utility construction work |
|
Main Electrical & Central Chiller Plant Building - Construction of fuel tank room - Installation metal Doors, chillers, building services, electrical switchboard, cable laying |
|
ActiDAFF - Underground utility construction work - Laying of roof floor screed and tiles - Construction of plinths for saturator tanks - Erection and dismantling of scaffolding, installation of mechanical equipment and piping, bubble test - Installation of underdrain |
|
Product Water Storage Tank Building - Resin Injection Work & Water Test for 1 Water Tanks - Installation of cat ladders in Water Tanks, and door -
Installation of louvres, metal
cladding, building services, cable
laying, mechanical
equipment, steel pipe - Underground utility construction |
|
OSCG Building - Installation of Design for Manufacturing and Assembly Panel and metal door - Underground utility construction work - Installation of building services and mechanical equipment |
|
Reverse Osmosis Building - Installation of Design for Manufacturing and Assembly Panels at East Sides - Installation of metal door, metal cladding, hand railings, Louvres & Windows - Installation of building services, electrical switchboard, mechanical equipment, steel pipe, Glass Reinforced Plastics (GRP) pipe and cable laying - Underground utility construction work |
|
Post Treatment Building - Installation of Louvres & Windows, metal door and cat ladders - Installation of Design for Manufacturing and Assembly Panels - Installation of building services, mechanical equipment and GRP pipe - Underground utility construction work |
|
Inspection corridor - Construction of bondek for segments 7 - construction of staircase 8 |
|
CO2 Tanks - Installation of pipes and building services Outfall Shaft -
GRP Diffuser Pipe
installation and rock
material back fill - Dredging for diffuser pipe; Glass Reinforced Plastics Diffuser Pipe installation; rock material back fill - Shafts backfill rock and excavation and lateral support (ELS) removal Combined Shaft -
Installation of building services, electrical equipment, switchboard, cable laying,
mechanical equipment and pipes, stoplogs and band screens |
|
- Underground utility construction work -
Staircases and internal finishing - Waterproofing works Pump room - internal finishing and screeding Other -
Excavation at slope
toe and access
erection, Soil anchor
and grouting construction -
Foundation & structure construction at Elevated Walkway - Watermain works at CLP 132 kV Substation -
Concrete Breaking, Structure Construction at Seawall - Rock anchor installation; rock drilling, grouting |
A summary of the valid permits, licences, and /or notifications on environmental protection for this Project is presented in Table 1.2.
|
Permit/ Licences |
Valid Period |
Status |
Remark |
|
|
From |
To |
|||
|
Environmental Permit |
||||
|
EP - 503/2015/A |
Throughout the Contract |
Valid |
- |
|
|
FEP - 01/503/2015/A |
Throughout the Contract |
Valid |
- |
|
|
Notification of Construction Works under the Air
Pollution Control (Construction Dust) Regulation (Form NA) |
||||
|
451539 |
Throughout the Contract |
Valid |
- |
|
|
Billing Account for Disposal of Construction Waste |
||||
|
7036276 |
Throughout the Contract |
Valid |
- |
|
|
Chemical Waste
Producer Registration |
||||
|
5213-839-A2987-01 |
Throughout the Contract |
Valid |
- |
|
|
Wastewater Discharge Licence (Land and Marine
works) |
||||
|
WT00035775-2020 |
23/08/2021 |
31/07/2025 |
Valid |
- |
|
Marine Dumping
Permits |
||||
|
EP/MD/23-053 |
07/12/2023 |
30/03/2023 |
Expired in the reporting period |
- |
|
Permit/ Licences |
Valid Period |
Status |
Remark |
|
|
From |
To |
|||
|
EP/MD/23-122 |
31/03/2023 |
30/06/2023 |
Valid |
|
|
Vessel CHITs
for fill disposal |
||||
|
7039300 |
14/02/2023 |
08/05/2023 |
Expired in the reporting period |
- |
|
Construction Noise
Permit |
||||
|
GW-RE1338-22 |
22/12/2022 |
21/06/2023 |
Valid |
- |
The status for all environmental aspects is presented in Table 1.3.
|
Parameters |
Status |
|
Water Quality |
|
|
Baseline Monitoring under EM&A Manual |
The baseline water quality monitoring was conducted between 12 May 2020 and 6 June 2020 |
|
Impact Monitoring |
On-going |
|
Noise |
|
|
Baseline Monitoring |
The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.4 |
|
Impact Monitoring |
On-going |
|
Waste Management |
|
|
Mitigation Measures in Waste Management Plan |
On-going |
|
Landfill Gas |
|
|
Regular Monitoring when Construction Works are within the 250m Consultation Zone |
In this reporting period, 146 times of landfill gas monitoring were recorded at Wan Po Road (Ch0+390 - Ch0+780). No exceedance of action or limit level for methane, oxygen and carbon dioxide was observed |
|
Environmental Audit |
|
|
Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual |
On-going |
Other than the EM&A work by ET, environmental briefings, trainings and regular environmental management meetings were conducted, in order to enhance environmental awareness and closely monitor the environmental performance of the contractors.
The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the EM&A Manual. A summary of implementation status of the environmental mitigation measures for the construction phase of the Project during the reporting period is provided in Appendix C.
NOISETo ensure no adverse noise impact, construction noise monitoring is recommended to be carried out within 300m radius from the nearby noise sensitive receivers (NSRs), during construction phase. The NSRs selected as monitoring station are (i) NSR4 - Creative Secondary School, (ii) NSR24 - PLK Laws Foundation College, and (iii) NSR31 - School of Continuing and Professional Studies - CUHK respectively.
No impact construction noise monitoring was conducted in the reporting period due to the overly distant monitoring station from the works location, where they were farther than 1 km from the closet monitoring station NSR4 to the works location.
Construction noise level would be measured in terms of the A-weighted equivalent continuous sound pressure level (LAeq). Leq 30min was used as the monitoring parameter for the time period between 0700 and 1900 on normal weekdays. Table 2.1 summarizes the monitoring parameters, frequency and duration of the impact noise monitoring.
Table 2.1 Noise Monitoring Parameters, Time, Frequency
and Duration
|
Time |
Duration |
Interval |
Parameters |
|
Daytime: 0700-1900 |
Day time: 0700-1900 (during normal weekdays) |
Continuously in Leq 5min/Leq 30min (average of 6 consecutive Leq 5min) |
Leq 30min L10 30min & L90 30min |
The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.
According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 below.
|
NSR ID |
Noise Sensitive Receivers |
Monitoring Location |
Position |
|
NSR 4 |
Creative Secondary School |
Roof Floor |
1 m from facade |
|
NSR 24 |
PLK Laws Foundation College |
Pedestrian Road on Ground
Floor |
Free-field |
|
NSR 31 |
School of Continuing and Professional
Studies - CUHK |
Roof Floor |
1 m from facade |
The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements. Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.
|
|
|
Figure 2.1 NSR4
Creative Secondary School |
|
|
|
Figure 2.2 NSR24
PLK Laws Foundation College |
|
|
|
Figure 2.3 NSR31 School
of Continuing and Professional Studies - CUHK |
The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities - Non-statutory Controls” and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 are presented in Table 2.3.
|
Time Period |
Action Level |
Limit Level (dB(A)) |
|
0700-1900 on normal weekdays |
When one documented complaint is received from any one of the noise sensitive receivers |
- 70 dB(A) for school and - 65 dB(A) during examination period |
Notes: Limits specified in the GW-TM
and IND-TM for construction and operation noise,
respectively.
If exceedances were found during noise monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix E.
Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. No noise monitoring station was located within a radius of 300m of the Project site as shown in Figure 2.4, no impact monitoring for noise impact was conducted in the reporting period.
Figure 2.4 Site Layout
Plan with Noise Sensitive Receivers and Desalination Plant
WATER QUALITYIn accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. In addition, baseline water quality monitoring was conducted prior to the commencement of marine construction activities.
The following Section provides details of the water quality monitoring to be undertaken by the Environmental Team (ET) to verify the distance of sediment and brine plume dispersion and to identify whether the potential exists for any indirect impacts to occur to ecological sensitive receivers. The water quality monitoring programme was carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.
Water quality monitoring for the Project can be divided into the following stages:
- Dredging activities during construction phase;
- Discharge of effluent from main disinfection during construction phase;
- Operation phase - first year upon commissioning; and,
- Continuous monitoring of effluent quality.
The parameters that have been selected for measurement in situ and in the laboratory are those that were either determined in the EIA
to be those with the most potential to be affected by the construction works or
are a standard check on water quality conditions. Parameters measured in the
impact monitoring are listed in Table
3.1
|
Parameters |
Unit |
Abbreviation |
|
In-situ measurements |
||
|
Dissolved oxygen |
mg/L |
DO |
|
Temperature |
oC |
- |
|
pH |
- |
- |
|
Turbidity |
NTU |
- |
|
Salinity |
0/00 |
- |
|
Laboratory measurements |
||
|
Suspended Solids |
mg/L |
SS |
In addition to the water quality parameters, other relevant data were measured and recorded in Water Quality Monitoring Logs, including the location of the sampling stations, water depth, time, weather conditions, sea conditions, tidal stage, current direction and velocity, special phenomena and work activities undertaken around the monitoring and works area that may influence the monitoring results.
The impact water quality monitoring locations
are detailed in Table 3.2 and
shown in Figure
3.1 below.
Table 3.2 Location
of Impact 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 |
|||||
Figure 3.1 Impact Water Quality Monitoring
Locations under EM&A Manual
The monitoring methodology, equipment used, and QA/QC procedures could be referred to Section 3.1.2 -3.1.4, 3.1.6-3.1.7 and 3.2 of the Monthly EM&A Report.
The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual and based on the baseline water quality monitoring data and the derivation criteria, the Action/Limit Levels have been derived and are presented in Table 3.3.
|
Parameters |
Action |
Limit |
|
|
Construction Phase
Impact Monitoring |
|||
|
DO in mg/L |
Surface and Middle |
Surface and Middle |
|
|
|
7.30 mg L-1 |
4 mg L-1 |
|
|
|
Bottom |
Bottom |
|
|
|
7.31 mg L-1 |
2 mg L-1 |
|
|
|
Tung Lung Chau Fish Culture Zone |
Tung Lung Chau Fish Culture Zone |
|
|
|
5.1 mgL-1 or level at control station |
5.0 mgL-1 or level at control station |
|
|
|
(Whichever the lower) |
(Whichever the lower) |
|
|
SS in |
mg/L |
5.00 mg L-1 or 20% exceedance of |
6.00 mg L-1 or 30% exceedance of |
|
(Depth- |
|
value at any impact station compared |
value at any impact station |
|
averaged) |
|
with corresponding data from control |
compared with corresponding data |
|
|
|
station |
from control station |
|
Turbidity in NTU |
2.41 NTU or 20% exceedance of value |
2.84 NTU or 30% exceedance of |
|
|
(Depth- |
at any impact station compared with |
value at any impact station |
|
|
averaged) |
corresponding data from control |
compared with corresponding data |
|
|
|
station |
from control station |
|
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.
General water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) were conducted as scheduled in the reporting month.
One hundred and twenty-nine (129) of the general water quality monitoring results of suspended solids (SS) obtained had exceeded the Action Level. One hundred and six (106) of the general water quality monitoring results of SS obtained during the reporting quarter had exceeded the Limit Level.
Investigation on the reason of exceedance has been carried out, where the exceedances of SS were concluded to be unrelated to the project. Details of the instigation could be referred to Monthly EM&A Report Appendix O
Table 3.4 Summary of Regular Impact
Water Quality Monitoring Results (Mid-Flood)
|
Location |
Parameter |
|||||||||||||||||||||
|
Salinity (ppt) |
Dissolved Oxygen
(mg/L) |
pH |
Turbidity (NTU) |
Suspended Solids (mg/L) |
Temp. (oC) |
|||||||||||||||||
|
Surface &
Middle |
Bottom |
|||||||||||||||||||||
|
Mar |
Apr |
May |
Mar |
Apr |
May |
Mar |
Apr |
May |
Mar |
Apr |
May |
Mar |
Apr |
May |
Mar |
Apr |
May |
Mar |
Apr |
May |
||
|
CE |
Avg. |
32.8 |
32.7 |
32.7 |
8.7 |
8.9 |
8.9 |
8.7 |
8.9 |
8.9 |
8.2 |
8.2 |
8.3 |
2.5 |
2.6 |
2.5 |
3.5 |
2.9 |
2.7 |
21.2 |
22.9 |
25.7 |
|
Min. |
30.7 |
31.4 |
30.9 |
8.2 |
8.2 |
8.4 |
8.2 |
8.2 |
8.4 |
8.1 |
8.1 |
8.2 |
1.9 |
2.2 |
2.2 |
2.5 |
2.5 |
2.5 |
19.7 |
20.8 |
21.5 |
|
|
Max |
34.2 |
33.8 |
33.5 |
9.5 |
9.5 |
9.7 |
9.4 |
9.6 |
9.7 |
8.4 |
8.4 |
8.4 |
3.0 |
3.0 |
2.9 |
22.0 |
5.0 |
5.0 |
22.6 |
25.1 |
27.5 |
|
|
CF |
Avg. |
32.6 |
32.5 |
32.8 |
8.7 |
8.8 |
8.9 |
8.7 |
8.8 |
8.9 |
8.3 |
8.2 |
8.3 |
2.9 |
3.0 |
2.9 |
4.4 |
2.9 |
2.9 |
21.2 |
23.1 |
26.0 |
|
Min. |
30.6 |
31.5 |
31.7 |
8.2 |
8.2 |
8.4 |
8.2 |
8.2 |
8.5 |
8.1 |
8.1 |
8.2 |
2.3 |
2.5 |
2.5 |
2.5 |
2.5 |
2.5 |
20.0 |
20.6 |
25.1 |
|
|
Max |
34.3 |
33.2 |
33.8 |
9.6 |
9.5 |
9.6 |
9.6 |
9.5 |
9.6 |
8.5 |
8.4 |
8.4 |
3.4 |
3.6 |
3.3 |
22.0 |
9.0 |
7.0 |
22.4 |
25.0 |
27.2 |
|
|
WSR1 |
Avg. |
32.6 |
32.5 |
32.6 |
8.8 |
9.0 |
8.7 |
8.8 |
9.0 |
8.7 |
8.2 |
8.2 |
8.3 |
2.0 |
2.1 |
2.0 |
4.4 |
3.1 |
2.6 |
21.2 |
23.0 |
25.9 |
|
Min. |
31.2 |
31.8 |
31.4 |
8.1 |
8.3 |
8.3 |
8.1 |
8.3 |
8.2 |
8.2 |
8.1 |
8.2 |
1.7 |
1.6 |
1.6 |
2.5 |
2.5 |
2.5 |
19.8 |
21.3 |
24.9 |
|
|
Max |
33.8 |
33.8 |
33.7 |
9.5 |
9.8 |
9.2 |
9.5 |
9.7 |
9.2 |
8.4 |
8.4 |
8.4 |
2.4 |
2.4 |
2.4 |
22.0 |
6.0 |
5.0 |
22.6 |
25.4 |
27.0 |
|
|
WSR2 |
Avg. |
32.5 |
32.7 |
32.6 |
9.1 |
8.9 |
8.9 |
9.1 |
8.9 |
8.9 |
8.2 |
8.2 |
8.3 |
2.0 |
2.1 |
2.1 |
3.7 |
2.8 |
2.7 |
21.1 |
23.0 |
25.9 |
|
Min. |
31.3 |
31.5 |
31.8 |
8.3 |
8.4 |
8.2 |
8.3 |
8.3 |
8.2 |
8.1 |
8.2 |
8.1 |
1.7 |
1.6 |
1.7 |
2.5 |
2.5 |
2.5 |
20.1 |
21.0 |
24.7 |
|
|
Max |
33.7 |
33.9 |
33.3 |
9.7 |
9.6 |
9.5 |
9.8 |
9.5 |
9.5 |
8.4 |
8.4 |
8.4 |
2.3 |
2.5 |
2.5 |
11.0 |
6.0 |
4.0 |
22.5 |
25.4 |
27.2 |
|
|
WSR3 |
Avg. |
32.6 |
32.7 |
32.8 |
8.8 |
8.8 |
9.1 |
8.8 |
8.8 |
9.1 |
8.2 |
8.3 |
8.3 |
2.1 |
2.1 |
2.1 |
3.5 |
2.7 |
2.8 |
21.2 |
23.1 |
26.0 |
|
Min. |
30.7 |
31.5 |
31.8 |
8.3 |
8.2 |
8.7 |
8.3 |
8.2 |
8.6 |
8.1 |
8.1 |
8.1 |
1.7 |
1.7 |
1.7 |
2.5 |
2.5 |
2.5 |
20.1 |
20.5 |
24.6 |
|
|
Max |
34.1 |
33.6 |
33.7 |
9.5 |
9.3 |
9.4 |
9.5 |
9.3 |
9.5 |
8.4 |
8.4 |
8.4 |
2.4 |
2.4 |
2.5 |
14.0 |
6.0 |
6.0 |
22.5 |
25.5 |
27.8 |
|
|
WSR4 |
Avg. |
32.7 |
32.6 |
32.6 |
8.9 |
8.9 |
8.8 |
8.9 |
8.9 |
8.8 |
8.3 |
8.2 |
8.3 |
2.0 |
2.1 |
2.1 |
3.7 |
2.7 |
2.9 |
21.1 |
23.0 |
26.0 |
|
Min. |
31.2 |
31.2 |
31.9 |
8.2 |
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