Revision History
Rev. |
Description of Modification |
Date |
1. |
First Issue for Comments |
06/09/2024 |
2. |
Revised According to Comments |
11/09/2024 |
CONTENTS
9. Summary of Exceedance, Complaints, Notification of Summons and Prosecutions.............. 34
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 |
Event/Action Plan |
Appendix E |
Landfill Gas Equipment Calibration Certificate |
Appendix F |
Landfill Gas Monitoring Data |
Appendix G |
Waste Flow Table |
Appendix H |
Site Inspection Proforma |
Appendix I |
Complaint Log |
Appendix J |
Exceedance Report |
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/B) 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 54th Monthly 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 August to 31 August 2024.
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 Contract included the followings:
Administration Building - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; - Minor Installation of building services, minor cables laying and termination. T&C |
Chemical building - Defect rectification |
Main Electrical & Central Chiller Plant Building - Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning |
ActiDAFF - Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning |
Product Water Storage Tank Building - Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning |
OSCG Building - Installation of cladding and railing on Brine Maker Tank - Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning |
Reverse Osmosis Building - Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets - Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation |
Post Treatment Building - Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning |
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
Combined Shaft and Pump room - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Others - Slope works |
A6. The major environmental impacts brought by the above construction works include:
- Construction dust and noise generation from construction works and excavation works and slope works;
- Waste generation from the construction activities
A7. The key environmental mitigation measures implemented for the Contract 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 regular inspection to machinery and plants/vehicles on-site to ensure proper functioning;
- Deployment of silt curtain at the inshore water outflow;
- Sorting and storage of general refuse and construction waste; and
-
Deployment protective fencing
for trees
Summary of exceedance & investigation &
follow-up
A8. No noise monitoring was conducted during the reporting period since there are no Contract -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 construction phase marine water quality programme was ceased from 1 September 2023 due to the completion of marine-related construction works.
A10. Water quality monitoring of the discharge of dechlorinated effluent in disinfection procedure is completed in December 2023. The hourly dechlorinated effluent monitoring during the discharge is finished.
A11. In this reporting period, 81 times of landfill gas monitoring were periodically conducted at TKO Area 137 (Ch1+120 - Ch1+800) until 31 August 2024. No exceedances of action level and limit level was observed.
A12. Joint site inspections of the construction work by ET and IEC were carried out on 26 August 2024 to audit the mitigation measures implementation status.
Complaint Handling and Prosecution
A13. No environmental complaint, notification of summons and prosecution was received in the reporting period.
Reporting Change
A14. According to the contractor’s information, the TKODP commenced operation phase on 1 July 2024. The outstanding construction works were being carried out during this reporting period.
Summary of Upcoming
Key Issues and Key Mitigation Measures
A15. Key activities anticipated in the next reporting period for the Contract will include the followings:
Administration Building - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; - Minor Installation of building services, minor cables laying and termination. T&C |
Chemical building - Defect rectification |
Main Electrical & Central Chiller Plant Building - Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning |
ActiDAFF - Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning |
Product Water Storage Tank Building - Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning |
OSCG Building - Installation of cladding and railing on Brine Maker Tank - Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning |
Reverse Osmosis Building - Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets - Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation |
Post Treatment Building - Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning |
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
Combined Shaft and Pump room - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Others - Slope works |
A16. The major environmental impacts brought by the above construction works will include:
- Construction dust and noise generation from excavation and construction works and slope works;
- Waste generation from construction activities.
A17. The key environmental mitigation measures for the Contract in the coming reporting period associated with the above construction works will include:
- Reduction of noise from equipment and machinery on-site;
- Dust suppression by regular wetting and water spraying for construction works and at main haul road;
- Sorting and storage of general refuse and construction waste;
- Deployment of silt curtain at the inshore water outflow;
-
Deployment protective fencing
for trees.
Background
1.1. The Acciona Agua, S.A. Trading, Jardine Engineering Corporation, Limited and China State Construction Engineering (Hong Kong) Limited 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).
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 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.
1.3. Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-503/2015/B) to Water Supplies Department (WSD); and granted the Further Environmental Permit (No. FEP-01/503/2015/B) to AJCJV for the Contract.
1.4. According to the contractor’s information, the TKODP commenced operation phase on 1 July 2024. The outstanding construction works were being carried out during this reporting period.
The Reporting Scope
1.5. This is the 54th Monthly EM&A Report for the Contract which summarizes the key findings of the EM&A programme during the reporting period from 1 August to 31 August 2024.
Contract Organization
1.6. The Contract Organization structure for Construction Phase is presented in Figure 1.1.
Figure 1.1 Contract Organization Chart
1.7. 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. |
Contract
Proponent (Water Supplies Department) |
SE/CM2 |
Milton Law |
2634-3573 |
Supervising Officer (Binnies Hong Kong Limited) |
Project Manager |
Augustine Li |
2608-7671 |
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 |
|
Environmental Monitoring Manager |
Tommy Law |
6468-1782 |
|
Acuity Sustainability Consulting Limited |
Environmental Team Leader |
Toby Wan |
9719-5422 |
Lam Environmental Services Limited |
Independent Environmental Checker (IEC) |
Serena Shek |
6149-6683 |
Summary of Construction Works
1.8. Details of the major construction activities undertaken in this reporting period are shown below. The master programme is presented in Appendix A.
1.9. Key activities carried out in this reporting period for the Contract included the followings:
|
Administration Building - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; Minor Installation of building services, minor cables laying and termination. T&C |
||
|
Chemical building - Defect rectification |
||
|
Main Electrical & Central Chiller Plant Building - Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning |
||
|
ActiDAFF - Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning |
|
|
Product Water Storage Tank Building - Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning |
|
||
OSCG Building - Installation of cladding and railing on Brine Maker Tank - Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning |
|
||
Reverse Osmosis Building - Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets - Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation |
|
||
Post Treatment Building - Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning |
|
||
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
|
||
Combined Shaft and Pump room - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination Others - Slope works |
|
||
1.10. A summary of the valid permits, licences, and/or notifications on environmental |
|
||
protection for this Contract is presented in Table 1.2.
Table 1.2 Summary
of the Status of Valid Environmental Licence,
Notification, Permit and Documentations
Permit/ Licences |
Valid Period |
Status |
Remark |
|
From |
To |
|||
Environmental Permit |
||||
EP-503/2015/B |
Throughout the Contract |
Valid |
-Issued on 3 April 2024 |
|
FEP - 01/503/2015/B |
Throughout the Contract |
Valid |
-Issued on 3 April 2024 |
|
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 |
- |
|
Sludge (Special Waste)
Disposal (Admission Ticket) |
||||
17913 |
01/07/2024 |
31/12/2024 |
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 |
- |
WT00044188- 2023 |
16/06/2023 |
30/06/2028 |
Valid |
- For Plant T&C and operation. - Variation sampling point S.P.1 is approved by the EPD on 25 June 2024 (EPD ref.: EP640/W3/D1358/462 874). |
Construction Noise Permit |
||||
GW-RE0667-24 |
22/06/2024 |
20/12/2024 |
Valid |
- |
1.11. The status for all environmental aspects is presented in Table 1.3.
Table 1.3 Summary
of Status for Key Environmental Aspects under the EM&A Manual
Parameters |
Status |
Water Quality |
|
Baseline Monitoring under EM&A Manual |
The baseline water quality monitoring was conducted between 12 May 2020 to 6 Jun 2020. |
Construction Phase Impact Monitoring |
Ceased from 1 September 2023 |
Operation phase Marine Impact Monitoring |
On-going |
Impact Monitoring of Effluent Discharge from Main Disinfection |
Completed |
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 |
Completed |
Waste Management |
|
Mitigation Measures in Waste Management Plan |
On-going |
Landfill Gas |
|
Regular Monitoring when construction works are within the 250 m Consultation Zone |
On-going |
Ecology (Coral) |
|
Operation phase Regular Coral Monitoring (Monthly) |
On-going |
Ecology (Fishery) |
|
Operation phase Regular Fishery Monitoring (Seasonally) |
On-going |
Ecology (Landscape) |
|
Operation phase Landscape and Visual Site Inspection |
On-going |
Environmental Audit |
|
Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual |
On-going |
1.12. 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.
1.13. 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 Contract during the reporting period is provided in Appendix C.
Monitoring Requirements
2.1. To ensure no adverse noise impact, 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.
2.2. Construction noise level were 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. Construction works would follow stipulations of the valid Construction Noise Permits if works had to be conducted during restricted hours or public holidays. 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 |
Monitoring Locations
2.3. The monitoring locations were normally 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.
2.4. 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.
Table 2.2 Noise Sensitive Receivers
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 |
2.5. 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 |
Impact Monitoring Methodology
2.6. Integrated sound level meter will be used for the noise monitoring. The meter will be in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications. Immediately prior to and following each noise measurement the accuracy of the sound level meter will be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements will be accepted as valid only if the calibration levels before and after the noise measurements agree to within 1.0 dB(A).
2.7. Noise measurements were not made in the presence of fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s. The wind speed shall be checked with a portable wind speed meter capable of measuring the wind speed in m/s.
Action and Limit Levels
2.8. 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.
Table 2.3 Action and Limit Levels
for Noise per EM&A Manual
Time Period |
Action |
Limit (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 |
Note: Limits specified in the GW-TM and IND-TM for construction and operation noise,
respectively.
2.9.
If exceedances were found
during noise monitoring, the actions in accordance with the Event and Action
Plan shall be carried out according to Appendix
D.
Monitoring Results
and Observations
2.10. Referring to EM&A Manual Section 4.1.2, the impact noise monitoring should be carried out when there are Contract-related construction activities undertaken within a radius of 300m from the monitoring stations. As no Contract-related construction activities were undertaken in the reporting month within a radius of 300m from the monitoring stations as shown in Figure 2.4, no impact noise monitoring was conducted in the reporting period.
Figure 2.4 Site Layout Plan with Noise Sensitive Receivers and Desalination Plant
3.1. In accordance with the recommendations of the EIA, water quality monitoring is required during dredging for the submarine pipelines and, during operation phase. 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.
3.2. The water quality monitoring programme was be carried out to allow any deteriorating water quality to be readily detected and timely action taken to rectify the situation.
3.3. Water quality monitoring for the Contract can be divided into the following stages:
- Dredging activities during construction phase;
- Discharge of effluent from main disinfection during construction phase; and
- Operation activities during operation phase.
Water Quality
Parameters
3.4. 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 to be measured in the impact monitoring are listed in Table 3.1.
Table 3.1 Parameters measured
in the Impact Marine Water Quality Monitoring
Parameters |
Unit |
Abbreviation |
In-situ measurements |
||
Dissolved oxygen |
mg/L |
DO |
Temperature |
oC |
- |
pH |
- |
- |
Turbidity |
NTU |
- |
Salinity |
0/00 |
- |
Total Residual Chlorine NOTE1 |
mg/L |
TRC |
Laboratory measurements |
||
Suspended Solids |
mg/L |
SS |
Iron-Soluble |
mg/L |
Fe |
Anti-scalant as Reactive Phosphorus |
mg/L |
PO4 as P- |
NOTE 1: Monitoring of Total Residual
Chlorine will be conducted when cleaning and sterilization of the new freshwater main is carried out.
3.5. In addition to the water quality parameters, other relevant data were also being 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.
Monitoring Equipment
3.6. For water quality monitoring, the following equipment were used:
Dissolved Oxygen and Temperature Measuring Equipment - The instrument was a portable, weatherproof dissolved oxygen measuring instrument complete with cable, sensor, comprehensive operation manuals, and was operable from a DC power source. It was 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 has 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 were 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 was a portable, weatherproof turbidity-measuring unit complete with cable, sensor and comprehensive operation manuals. The equipment was operated from a DC power source, it has a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU and 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 was 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) was 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 was suitably calibrated.
Positioning Device - A Global Positioning System (GPS) was used during monitoring to allow accurate recording of the position of the monitoring vessel before taking measurements. The Differential GPS, or equivalent instrument, was 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, was used. The water sampler has 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 -Total residual chlorine (TRC) shall be measured in-situ using approved test kit.
Sampling / Testing Protocols
3.7. All in situ monitoring instruments were checked, calibrated, and certified by a laboratory 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 were checked with certified standard solutions before each use.
3.8. On-site calibration of field equipment was following the “Guide to On-Site Test Methods for the Analysis of Waters”, BS 1427: 2009. Sufficient stocks of spare parts were maintained for replacements when necessary. Backup monitoring equipment was made available so that monitoring can proceed uninterrupted even when equipment is under maintenance, calibration etc.
Laboratory Measurement and Analysis
3.9. Sufficient volume of each water sample was collected for carrying out the laboratory analyses. Using chain of custody forms, collected water samples were transferred to a HOKLAS accredited laboratory (Acumen Laboratory and Testing Limit - HOKLAS 241) for immediate processing. The determination work was start within the next working day after collection of the water samples. Analytical methodology and sample preservation of other parameters were 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 QA/QC details were in accordance with the requirements of HOKLAS or another internationally accredited scheme.
3.10. Parameters for laboratory measurements, standard methods and detection limits are presented in Table 3.2.
Table 3.2 Laboratory measurements, standard methods, and corresponding
detection limits of marine water quality monitoring
Parameters |
Standard Methods |
Detection Limit |
Reporting Limit |
Precision |
Dissolved oxygen |
Instrumental, CTD |
0.1 |
- |
+-25% |
Temperature |
Instrumental, CTD |
0.1 |
- |
+-25% |
pH |
Instrumental, CTD |
0.1 |
- |
+-25% |
Turbidity |
Instrumental, CTD |
0.1 |
- |
+-25% |
Salinity |
Instrumental, CTD |
0.1 |
- |
+-25% |
Suspended Solids |
APHA 23rd Ed 2540D |
1.0 |
2.5 |
+-17% |
Iron |
APHA 3111 B |
0.2 |
- |
+-25% |
Total residual chlorine |
Test Kit (Lovibond MD200) |
Lowest limit
= 0.01mg/L; Upper limit
= 6 mg/L |
- |
+-25% |
Monitoring Location
Construction Phase
3.11. The Impact water quality monitoring was ceased from 1 September 2023 due to the completion of marine-related construction works.
Operation phase
3.12. The operation phase impact water quality monitoring locations are in accordance with the EM&A Manual and detailed in Table 3.3 below. A schedule for water quality monitoring was prepared by the ET and submitted to IEC and EPD prior to the commencement of the monitoring.
Table 3.3 Location
of Impact Water Quality Monitoring Stations
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 |
3.13. 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. NF1 to NF3 are the Edge of Mixing zone.
Figure 3.1 Impact water quality
monitoring locations under EM&A Manual
Sampling Frequency
Operation phase
3.14. Impact water quality monitoring were carried out three days per week during the commission phase. Monitoring at each station was undertaken once per day. The interval between two sets of monitoring was not less than 36 hours. The monitoring frequency would be increased in the case of exceedances of Action/Limit Levels if considered necessary by ET. Monitoring frequency would be maintained as far as practicable.
Sampling Depths & Replication
3.15. During impact water quality monitoring, each station was sampled, and measurements/ water samples were taken at three depths, 1 m below the sea surface, mid-depth, and 1 m above the seabed. For in situ measurements, duplicate readings were made at each water depth at each station. Duplicate water samples were collected at each water depth at each station.
Action and Limit Levels
Operation phase
3.16. The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual. The Action/Limit Levels have been derived and are presented in Table 3.4.
Table 3.4 Derived Action
and Limit Levels
for Water Quality
Parameters |
Action |
Limit |
Operation 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 |
Salinity
in PSU (Depth- averaged) |
34.25 PSU
or 9% exceedance of value at any impact station compared with corresponding data from control station |
34.56 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 mg/L |
0.3 mg/L |
Total residual chlorine in mg/L |
0.01 mg/L |
0.01 mg/L |
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.
Monitoring of Total Residual
Chlorine (Disinfection) will be conducted
when cleaning and sterilization of the new freshwater
main is carried out.
Monitoring Results and Observations
Construction Phase
3.17. Referring to EM&A Manual, the general water quality monitoring should be carried out when there are marine-related construction activities undertaken. General water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) was ceased from 1 September 2023 due to the completion of marine-related construction works.
Operation phase
3.18. According to the contractor’s information, the operation phase of TKODP commenced on 1 July 2024. Details of the operation phase water quality monitoring will be presented in the Operation Monthly EM&A Report.
4.1. The waste generated from this Contract includes inert construction and demolition (C&D) materials, and non-inert C&D materials. Non-inert C&D materials are made up of general refuse, vegetative wastes and recyclable wastes such as plastics and paper/cardboard packaging waste. Steel materials generated from the Contract are also grouped into non-inert C&D materials as the materials were not disposed of with other inert C&D materials. With reference to relevant handling records and trip tickets of this Contract, the quantities of different types of waste generated in the reporting month are summarized in Table 4.1. Details of cumulative waste management data are presented as a waste flow table in Appendix G.
Table 4.1 Quantities of Waste Generated
from the Contract
during the reporting period
Reporting Month |
Actual Quantities of Inert C&D Materials Generated Monthly |
Actual Quantities of C&D Wastes
Generated Monthly |
|||||||||
Total
Quantity Generated |
Hard Rock and Large Broken Concrete |
Reused in the
Contract |
Reused in other Projects |
Disposed as Public Fill |
Imported Fill |
Metals |
Paper / cardboard packaging |
Plastics (1) |
Chemical Waste |
Others, e.g., general refuse |
|
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
(in ‘000kg) |
|
Aug 2024 |
163.330 |
0.000 |
0.000 |
0.000 |
163.330 |
0.000 |
0.000 |
0.000 |
0.000 |
2.460 |
42.260 |
Notes: (1) Plastics
refer to plastic
bottles / containers, plastic sheets / foam from packaging material
Monitoring Requirement
5.1. In accordance with Section 11 of the EM&A Manual, monitoring of landfill gas is required for construction works within the 250m Consultation Zone. Part of the desalination plant and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone; and part of the 1,200 mm diameter fresh water mains along Wan Po Road falls within the SENT Landfill and SENT Landfill Extension Consultation Zones, TKO Stage II/III Restored Landfill and TKO Stage I Restored Landfill Consultation Zones.
Monitoring Programme
5.2. Since part of the desalination plant (Wan Po Road and MIC compound/Basketball Court) and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone in this contract (Figure 5.1), landfill gas monitoring would be required for Wan Po Road and MIC compound/Basketball Court (Figure 5.2) if excavations were conducted at more than 300mm deep. Although SENT Landfill Extension has commenced operation since November 2021, no excavation works were conducted at MIC compound/Basketball Court. Hence no landfill gas monitoring would be scheduled for MIC compound/Basketball Court at the current stage.
Monitoring Location
5.3. Monitoring of oxygen, methane, carbon dioxide and barometric pressure would be performed for excavations at 1m depth or more within the consultation Zone.
5.4. During construction of works within the consultation zones, excavations of 1m depth or more was monitored:
- At the ground surface before excavation commences;
- Immediately before any worker enters the excavation;
- At the beginning of each working day for the entire period the excavation remains open; and
- Periodically through the working day whilst workers are in the excavation.
5.5. For excavations between 300mm and 1m deep, measurements were carried out:
- Directly after the excavation has been completed; and
- Periodically whilst the excavation remains open.
5.6. The area required to be monitored for landfill gas in the reporting period is shown in
Figure 5.1.
Figure 5.1 Overview
of the SENT Extension Consultation Zone and the Contract Site Area
Monitoring Parameters
5.7. The landfill gas monitoring parameters and the action and limit level are summarized in
Table 5.1.
Table 5.1 Action and Limit Level
for Landfill Gas Monitoring Equipment
Parameters |
Action Level |
Limit Level |
Oxygen (O2) |
<19% O2 |
<19% O2 |
Methane (CH4) |
>10% LEL |
>20% LEL |
Carbon Dioxide (CO2) |
>0.5% CO2 |
>1.5% CO2 |
MONITORING EQUIPMENT
5.8. Landfill Gas monitoring was carried out using intrinsically-safe, portable multi-gas monitoring instruments. The gas monitoring equipment is:
- Complying with the Landfill Gas Hazard Assessment Guidance Note as intrinsically safe;
- Capable of continuous barometric pressure and gas pressure measurements;
- Normally operated in diffusion mode unless required for spot sampling, when it should be capable of operating by means of an aspirator or pump;
- Having low battery, fault and over range indication incorporated;
- Capable of storing monitoring data, and shall be capable of being downloaded directly;
- Measure in the following ranges:
methane |
0-100% Lower Explosion Limit (LEL) and 0-100% v/v; |
oxygen |
0-25% V/V; |
carbon dioxide |
0-5% v/v; and |
barometric pressure |
mBar (absolute) |
• alarm (both audibly and visually) in the event that the concentrations of the following are exceeded:
methane |
>10% LEL; |
oxygen |
<19% |
carbon dioxide |
>0.5% by volume |
barometric pressure |
mBar (absolute) |
5.9. Monitoring equipment used in the reporting period are summarized in Table 5.2. The Landfill Gas monitoring equipment calibration certificate is presented in Appendix E.
Table 5.2 Landfill Gas Monitoring Equipment
Equipment |
Brand and Model |
Calibration Expiry Date |
Portable Gas Detector |
GMI PS500 - 25492809/21 |
29 July 2025 |
Figure 5.2 Location Map for Landfill
Gas Monitoring at TKO Area 137 (-0+440
- -0+760)
Figure 5.3 Location Map for Landfill
Gas Monitoring at TKO Area 137 (-0+740 - -1+060)
MONITORING
RESULTS AND OBSERVATIONS
5.10. In this reporting period, 81 times of landfill gas monitoring were periodically conducted during excavations at 300mm to 1m depth within the consultation zone and whenever workers entered the excavation on the day at TKO Area 137 (Ch1+120 - Ch1+800) until 31 August 2024. No exceedances of action level and limit level was observed.
Monitoring Requirements
6.1. In accordance with Section 8.1 of the EM&A Manual, weekly site audit shall be carried out by the ET include checking whether good site practices are being properly implemented by the Contractor and the extent of the works area within the Clear Water Bay Country Park should be checked by the ET during the weekly site audit.
Site Inspection
6.2. Weekly site audit was carried out by the ET in the reporting month, no trespass by the Contractor outside the works area of the Project and Clear Water Bay Country Park, and no damage to the vegetation and rocky shore outside the Project area was observed in the reporting month. Retained trees was properly protected during the construction works, no unacceptable construction works was observed.
6.3.
If non-compliance were found
during the construction works, the actions in accordance with the Event and
Action Plan will be carried out according to Appendix D.
7.1. Under the approval conditions of the EIA Report for the Project, an EM&A programme on coral for the operation phase of the Project is recommended. Pursuant to these EIA approval conditions and Condition 3.1 of the EP and FEP, details of the regular coral monitoring programme have been proposed based on the baseline coral monitoring results in the Report on Pre-Operation Baseline Coral Monitoring and Regular Coral Monitoring Methodology.
Monitoring Location
7.2. In accordance with Appendix B Section 5.1 of the approved supplementary EM&A Manual, two indirect impact sites (C2 and C3) and one control site (C8) as shown in Figure 7.1 should be monitored during the operation Phase. Pre-operation coral survey should be conducted at the indirect impact and control sites. Ten selected hard coral colonies with similar species should be tagged at each of the control and indirect impact sites before commencement of the operation phase. Tagged hard coral colonies should be monitored in open waters during the pre-operation phase and operation phase.
Figure 7.1 Spot Dive Check Areas Two Proposed
Indirect Impact Sites (C2 and C3)
and one control site (C8) during operation Phase
Action and Limit Levels
7.3. The Action and Limit Levels have been set based on the derivation criteria specified in the EM&A Manual. The Action/Limit Levels have been derived and are presented in Table 7.1.
Table 7.1 Action and Limit Level
for Coral Monitoring Equipment
Parameter |
Action Level Definition |
Limit Level Definition |
Mortality |
If during Impact
Monitoring a 15% increase in the percentage of partial mortality on the corals occurs at more than 20% of the
tagged indirect impact
site coral colonies that is not recorded on the tagged corals at the
control site, then the Action Level is exceeded |
If during Impact Monitoring
a 25% increase in the percentage of partial mortality on the corals occurs at more than 20% of the
tagged indirect impact
site coral colonies that is not recorded on
the tagged corals at the control site, then the Limit Level is exceeded |
Note: If the defined
Action Level or Limit Level for coral monitoring is exceeded, the actions as set out in
Table
E3 of Appendix D will be implemented.
7.4.
If non-compliance were found
during the construction works, the actions in accordance with the Event and
Action Plan will be carried out according to Appendix D.
Monitoring Frequency
7.5. Operation phase coral monitoring shall be monitored once per month as the requirement of the first year of operational phase.
Monitoring Result
and Observation
7.6. According to the contractor’s information, the operation phase of TKODP commenced on 1 July 2024. Details of the operation phase coral monitoring will be presented in the Operation Monthly EM&A Report.
8.1. The purpose of the operation phase regular fisheries monitoring programme is to monitor the potential impacts on fisheries resources in the vicinity of the project site. Apart from the regular fisheries monitoring programme, a water quality monitoring programme in addition to the water quality monitoring programme in the approved EM&A Manual is also described in Section 2.4 to (i) provide supplementary information in the interpretation of the findings of the fisheries monitoring and (ii) assist the monitoring of the potential impact on the Tung Lung Chau Fish Culture Zone (FCZ) in Joss House Bay.
Monitoring Location
8.2. In accordance with Section 2.3 of the approved Methodology Paper on Regular Fisheries Monitoring, it is recommended to set up six (6) fisheries monitoring locations in Joss House Bay and its vicinity to monitor the fisheries resources.
8.3. Two (2) sampling locations are set up in close proximity of the direct footprint of the proposed submarine utilities around TKO Area 137. These sampling locations represent the potential Project impact zones (i.e. areas at and in close proximity to the footprint of the proposed submarine utilities that will be directly affected by the Project works).
8.4. Two (2) gradient locations are proposed between the proposed submarine utilities and Tung Lung Chau FCZ to assist in the interpretation and identification of any potential fisheries impact in the vicinity of the FCZ.
8.5. Two (2) reference locations are proposed in the outer Joss House Bay between the waters of Tung Lung Chau and Fat Tong Mun. These reference locations are further away and will not be affected by the Project discharge (based on the EIA prediction) and will serve as control stations. Any significant fisheries impact identified at the reference locations should be caused by other natural factors or non-Project activities. The trends of fisheries conditions recorded in the reference locations will be used to assist in the interpretation of the trends of fisheries impact identified in the impact and gradient locations.
8.6.
The coordinates of the proposed monitoring locations are shown in Figure 8.1.
Figure 8.1 Monitoring location
of regular fishery
monitoring during pre-operation Phase
Monitoring Frequency
8.7. Operation phase fishery monitoring shall be carried out 2 times in wet season (April to October) and 2 times in dry season (November to March) to examine the following:
- Fish species composition;
- Abundance: number of fish captured;
- Diversity of fish resources: species diversity and evenness;
- Size: range of total length; Biomass in weight; and
- Values of catches of commercial species: catch per unit effort (CPUE) and yield per unit effort (YPUE).
Monitoring Result
and Observation
8.8. According to the contractor’s information, the operation phase of TKODP commenced on 1 July 2024. Details of the operation phase fishery monitoring will be presented in the Operation Monthly EM&A Report.
9.1. The Environmental Complaint Handling Procedure is shown in below Figure 9.1:
Figure 9.1 Environmental Complaint
Handling Procedures
9.2. No noise monitoring was conducted during the reporting period since there are no Contract-related construction activities undertaken within a radius of 300m from the monitoring locations. No action Level exceedance for construction noise monitoring was recorded in the reporting month.
9.3. Construction phase general water quality monitoring at the ten monitoring stations (CE, CF, WSR1, WSR2, WSR3, WSR4, WSR16, WSR33, WSR36 and WSR37) are ceased from 1
September 2023 due to the completion of marine-related construction works.
9.4. The operation phase of TKODP commenced on 1 July 2024. Details of the operation phase water quality monitoring, coral monitoring、fishery monitoring and operation landfill gas monitoring will be presented in the Operation Monthly EM&A Report.
9.5. In this reporting period, 81 times of landfill gas monitoring were periodically conducted at TKO Area 137 (Ch1+120 - Ch1+800) until 31 August 2024. No exceedances of action level and limit level was observed.
9.6. No environmental complaint, notification of summons and prosecution Statistics on complaint and notification of summons and prosecution are summarized in Appendix I.
10.1. Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract. In the reporting period, site inspections were carried out on 6, 13, 20 and 26 August 2024 at the site portions listed in Table 10.1 below.
Table 10.1 Summaries of Site Inspection Record
Date |
Inspected Site Portion |
Time |
6 August 2024 |
TKO Area 137 |
14:30 - 15:30 |
13 August 2024 |
TKO Area 137 |
14:30 - 15:30 |
20 August 2024 |
TKO Area 137 |
14:30 - 15:30 |
26 August 2024 |
TKO Area 137 |
09:15 - 12:30 |
10.2. Joint site inspection with IEC was carried out on 26 August 2024.
10.3. Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections and during the reporting period are summarized in Table 10.2.
Table 10.2 Site Observations
Date |
Environmental Observations |
Follow-up Status |
6 August 2024 |
No major environmental deficiency was observed. |
N/A |
13 August 2024 |
No major environmental deficiency was observed. |
N/A |
20 August 2024 |
No major environmental deficiency was observed. |
N/A |
26 August 2024 |
No major environmental deficiency was observed. |
N/A |
10.4. According to the EIA Study Report, Environmental Permit, contract documents and EM&A Manual, the mitigation measures detailed in the documents should be implemented as much as practical during the reporting period. An updated Implementation Status of Environmental Mitigation Measures (EMIS) is provided in Appendix C. Site inspection proforma of the reporting period is provided in Appendix H.
11.1. Works to be undertaken in the next reporting month are:
Administration Building - Installation of AP Door, Wall finishing, Ceiling, Tile, Internal partition wall, cat ladder, wood decking; - Painting works and external finishing works; - Minor Installation of building services, minor cables laying and termination. T&C |
Chemical building - Defect rectification |
Main Electrical & Central Chiller Plant Building - Minor Installation of building services, cables laying and termination, Genet Testing & Commissioning |
ActiDAFF - Minor Installation of building services, minor cables laying and termination, Installation of FRP Enclosure System, Testing & Commissioning |
Product Water Storage Tank Building - Minor Installation of building services, cable laying and termination, PV Panel Installation, Testing & Commissioning |
OSCG Building - Installation of cladding and railing on Brine Maker Tank - Minor Installation of building services and pipework, cable laying and termination, Testing & Commissioning |
Reverse Osmosis Building - Installation of Signage, AP doors, sanitary fitting, sanitary ware in toilet, tiling work and water meter cabinets - Minor Installation of building services, minor cable laying and termination, Testing & Commissioning, PV Panel Installation |
Post Treatment Building - Minor Installation of building services, piping system, mechanical equipment, Pressure Test, cables laying and termination, Testing & Commissioning |
Inspection gallery - Interior fitting out works and painting works - Minor Installation of building services, Lift Installation |
Combined Shaft and Pump room - Testing & Commissioning - Installation of outfall grating and defect rectification Guard House - Defect rectification - Minor cable laying and termination |
Others - Slope works |
11.2. The major environmental impacts brought by the above construction works will include:
- Construction dust and noise generation from excavation and construction works and slope works;
- Waste generation from construction activities.
11.3. The key environmental mitigation measures for the Project in the coming reporting period associated with the above construction works will include:
- Dust suppression by regular wetting and water spraying for construction works;
- Reduction of noise from equipment and machinery on-site by regular checking of on-site plant/vehicle to ensure proper functioning;
- Sorting and storage of general refuse and construction waste;
- Deployment of silt curtain at the inshore water outflow; and
-
Deployment protective fencing
for trees
12.1. This is the 54th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 August to 31 August 2024, in accordance with the EM&A Manual and the requirement under FEP-01/503/2015/B.
12.2. No noise monitoring was conducted in the reporting period due to the construction activities not being undertaken within a radius of 300m from the monitoring locations.
12.3. The construction phase marine water quality programme was ceased from 1 September 2023 due to the completion of marine-related construction works.
12.4. The operation phase of TKODP commenced on 1 July 2024. Details of the operation phase water quality monitoring, coral monitoring, fishery monitoring and operation landfill gas monitoring will be presented in the Operation Monthly EM&A Report.
12.5. In this reporting period, 81 times of landfill gas monitoring were periodically conducted at TKO Area 137 (Ch1+120 - Ch1+800) until 20 April 2024. No exceedances of action level and limit level was observed.
12.6. Weekly environmental site inspections were conducted during the reporting period. Observations and reminders were reported during the site inspections. All items are rectified within the reporting period. The environmental performance of the project was therefore considered satisfactory.
12.7. According to the environmental site inspections performed in the reporting month, the Contractor is reminded to pay attention on chemical storage, site hygiene and dust suppression mitigation measures.
12.8. No environmental complaint, notification of summons and prosecution was received in the reporting period.
12.9. The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.
Appendix A
Master Programme
Appendix B
Overview of Desalination Plant in Tseung
Kwan O
Appendix C
Summary of
Implementation Status of Environmental Mitigation
EIA Reference |
Recommended Environmental
Protection Measures/ Mitigation Measures |
Objectives of the recommended measures & main concerns to address |
Implementation Agent |
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