Revision History
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CONTENTS
6. Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions
9. Conclusions and Recommendations
Appendix A |
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Summary of Implementation Status of Environmental Mitigation |
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Impact Monitoring Schedule of this and next Reporting Period |
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Works Description |
Location |
Contract No. CV/2020/09 · Rock excavation near sea-side of landing · Construction of panel wall and capping beam · Welding shear studs on H section of 610mm dia. pre-bored socketed H pile · Structural monitoring for nearby existing structures
Contract No. SS J521 · Precast Staircase wash granolithic · Installation of the Safety Mat · Demolition works · Backfill the existing sand in Viewing Platform |
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· Impact on water quality during excavation at sea-side of landing and wash granolithic works
· Construction dust and noise generation from excavation and demolition
· Demolition waste generation
· Silt curtains was deployed enclosing the dredging operation. Regular inspection on the silt curtain on the silt curtain condition by the contractor should be carried out.
· Stockpiling area should be provided with covers and water spraying system to prevent materials from being washed away;
· Minimized surface run-off in adjacent marine waters and programmed to minimize soil excavation works during inclement weather.
· Sort out demolition debris and excavated materials from demolition works to recover reusables.
· The dredging rate shall not exceed 100 m3 per hour with a maximum working period of 12 hours per day throughout the construction phase and operation phase.
· Reduction of noise from equipment and machinery on-site
· Sorting and storage of general refuse and construction waste
Works Description |
Location |
Contract No. CV/2020/09 |
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Rock excavation near sea-side of landing |
Landing Facility |
Construction for vertical seawall at landing |
Landing Facility |
Construction of sloping seawall at landing |
Landing Facility |
Construction of pile cap at landing facility |
Landing Facility |
Trim down excessive casing & H-section along at breakwater |
Breakwater Area |
Construction of pile cap and linking structure at breakwater |
Breakwater Area |
Structural monitoring for nearby existing structures |
Existing Structures to be Potential Effected by Construction Activities |
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Contract No. SS J521 |
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Tree removal |
Site |
· Impact on water quality from marine construction works and inland construction works
· Construction dust and noise generation from excavation and construction works
· Waste generation from construction activities
· Seawall modification works should be undertaken during low tide, when the water level is low.
· Minimized surface run-off in adjacent marine waters and programmed to minimize soil excavation works during inclement weather.
· Silt curtains should be deployed enclosing the dredging operation. Regular inspection on the silt curtain on the silt curtain condition by the contractor should be carried out.
· Reduction of noise from equipment and machinery on-site
· Sorting and storage of general refuse and construction waste
· The dredging rate shall not exceed 100 m3 per hour with a maximum working period of 12 hours per day throughout the construction phase and operation phase.
Civil Engineering and Development Department (CEDD) has contracted Concentric - Hong Kong River Joint Venture (CHKRJV) to carry out the Construction of Lei Yue Mun Public Landing Facility under Contract No. CV/2020/09; and Architectural Services Department (ArchSD) has contracted Milestone Builder Engineering Limited to carry out the development of a waterfront promenade and related improvement works under Contract No. SS J521 for the Lei Yue Mun Waterfront Enhancement Project (the Project).
Acuity Sustainability Consulting Limited (ASCL) is commissioned by CEDD 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-219/2018) 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 under Contract No. PI 2/2020.
Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Environmental Permit (No. EP-564/2018) to CEDD for the Project.
This is the 19th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 November to 30 November 2022.
The Project Organization structure for Construction Phase is presented in Figure 1.1. The key personnel’s’ contacts are presented in Table 1.1 and Table 1.2.
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Figure 1.1 Project Organization Chart |
Table 1.1 Key Personnel’s’ Contact for the Construction of a Public Landing Facility and Improvement Works to Existing Lookout Points and Viewing Platform
Party |
Position |
Name |
Phone |
Civil Engineering and Development Department |
Engineer |
Mr. Daniel Leung |
2760 5737 |
ANewR |
Independent Environmental Checker |
Mr. Choi Pui Sum, James |
2618 2831 |
Acuity Sustainability Consulting Limited |
Environmental Team |
Mr. Li Wai Ming, Kevin |
2698 6833 |
Concentric - Hong Kong River Joint Venture |
Environmental Officer |
Mr. Samson Ho |
6335 2008 |
Table 1.2 Key Personnel’s’ Contact for the Development of a Waterfront Promenade and Related Improvement Works
Party |
Position |
Name |
Phone |
Architectural Services Department |
Project Manager |
Mr. Ken Cheung |
2867 3972 |
ANewR |
Independent Environmental Checker |
Mr. Choi Pui Sum, James |
2618 2831 |
Acuity Sustainability Consulting Limited |
Environmental Team |
Mr. Li Wai Ming, Kevin |
2698 6833 |
Milestone Builder Engineering Ltd. |
Assistant Safety Officer |
Mr. Alex Cha |
9142 8173 |
Details of the major construction activities undertaken in this reporting period are shown as below. The construction programme is presented in Appendix A.
Key activities carried out in this reporting period for the Project included the followings:
Works Description |
Location |
Contract No. CV/2020/09 |
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Rock excavation near sea-side of landing |
Landing Facility |
Construction of panel wall and capping beam |
Landing Facility |
Welding shear studs on H section of 610mm dia. pre-bored socketed H pile |
Breakwater Area |
Structural monitoring for nearby existing structures |
Existing Structures to be Potential Effected by Construction Activities |
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Contract No. SS J521 |
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Precast Staircase wash granolithic |
Viewing platform |
Installation of the Safety Mat |
Site |
Demolition works |
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Backfill the existing sand in Viewing Platform |
A summary of the valid permits, licences, and/or notifications on environmental protection for this Project is presented in Table 1.3.
Table 1.3 Summary of the Status of Valid Environmental Licence, Notification and Permit
Permit/ Licenses/ Notification |
Reference |
Validity Period |
Contract No. CV/2020/09 |
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Environmental Permit |
EP-564/2018 |
Throughout the Contract |
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA) |
Ref. No.: 463353 |
Throughout the Contract |
Chemical Waste Producer Registration |
5213-298-C3752-02 |
Throughout the Contract |
Billing Account for Disposal of Construction Waste |
7039364 |
Throughout the Contract |
Discharge Licence under Water Pollution Control Ordinance |
WT00040594-2022 |
Valid to 30 Jun 2027 |
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Contract No. SS J521 |
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Environmental Permit |
EP-564/2018 |
Throughout the Contract |
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA) |
Ref. No.: 467619 |
Throughout the Contract |
Chemical Waste Producer Registration |
5312-298-M2939-02 |
Throughout the Contract |
Billing Account for Disposal of Construction Waste |
7039353 |
Throughout the Contract |
Discharge Licence under Water Pollution Control Ordinance |
WT00039075-2021 |
Valid to 30 Sep 2026 |
The status for all environmental aspects is presented in Table 1.4.
Table 1.4 Summary of Status for Key Environmental Aspects under the EM&A Manual
The baseline monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3 on 25 May 2021 |
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The impact water quality monitoring of the Project commenced on 14 September 2021 |
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The baseline monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3 on 25 May 2021 |
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Noise Management Plan |
The Noise Management Plan was submitted by the Contractor on 4 May 2021 and approved on 10 May 2021 |
Ecology |
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Conceptual Landscape Layout Plan |
The Conceptual Landscape Layout Plan will be submitted no later than three months prior to the commencement of detailed design of the landscape and architectural works of the Project under EP Condition 2.10 |
Coral Baseline Survey Report |
The Coral Baseline Survey Report was submitted to EPD under EP Condition 2.14 on 12 May 2021 and approved by EPD on 18 May 2021 |
Coral Translocation Plan |
The Coral Translocation Plan was submitted to EPD under EP Condition 2.16 on 28 April 2021 and commented received on 27 September 2021. Updated Coral Translocation Plan was submitted to EPD on 22 December 2021 and approved on 7 January 2022. |
Coral Review Report |
The Coral Review Report will be submitted no later than three months before the commencement of each maintenance dredging under EP Condition 2.20 |
Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual |
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 B.
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) NM1 – Village house in Lei Yue Mun Hoi Pong Road Central, (ii) NM2-A – No.79B, Lei Yue Mun Hoi Pong Road East, (iii) NM3 – Jockey Club Lei Yue Mun Plus and (iv) NM4 – No. 21C, Lei Yue Mun Hoi Pong Road East respectively.
In accordance with the EM&A Manual, baseline noise level at the noise monitoring stations were established as presented in the Baseline Monitoring Report. Impact noise monitoring was conducted once per week in the form of 30-minutes measurements Leq, L10 and L90 levels recorded at each monitoring station between 0700 and 1900 on normal weekdays.
Noise monitoring were carried out at the monitoring locations sited at LYM in the reporting month. The results are presented in Appendix F.
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. 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.
Table 2.2 Noise Monitoring Locations
Station |
Noise Monitoring Stations |
Monitoring Location |
Position |
NM1 |
Village house in Lei Yue Mun Hoi Pong Road Central |
Pedestrian Road on Ground Floor |
1 m from facade |
NM2 |
No.81, Lei Yue Mun Hoi Pong Road East |
Pedestrian Road on Ground Floor |
1 m from facade |
NM3 |
Jockey Club Lei Yue Mun Plus |
Fenced Road on Ground Floor |
1 m from facade |
NM4 |
No. 21C, Lei Yue Mun Hoi Pong Road East |
Fenced Road on Ground Floor |
1 m from facade |
The original construction noise monitoring station NM2 was selected at the façade of No. 81 of Lei Yue Mun Hoi Pong Road East. However, the residents of the premises at No. 81 of Lei Yue Mun Hoi Pong Road East do not allow the setting up of the construction noise monitoring station NM2. No. 79B, Lei Yue Mun Hoi Pong Road East, was proposed as the alternative noise monitoring location for set up of construction noise monitoring station named as NM2-A.
A Proposal for Alternative Noise Monitoring Station, which was certified by the ET Leader and verified by the IEC, has been prepared to conclude that the alternative construction noise monitoring station NM2-A could conform to relevant requirements as set out in the EM&A Manual, namely:
· locate close to the major site activities which are likely to have noise impacts;
· locate close to the most affected existing NSRs; and
· take into account the possibility of minimizing disturbance to occupants at the NSRs during monitoring.
The Proposal for Alternative Noise Monitoring Station NM2-A has been approved by EPD on 16 April 2021.
The latest locations for the construction noise monitoring are listed in Table 2.3.
Table 2.3 Updated Noise Monitoring Stations for Baseline and Impact Monitoring
Station |
Noise Sensitive Receiver |
Monitoring Location |
Position |
NM1 |
Village house in Lei Yue Mun Hoi Pong Road Central |
Pedestrian Road on Ground Floor |
1 m from facade |
NM2-A |
No.79B, Lei Yue Mun Hoi Pong Road East |
Pedestrian Road on Ground Floor |
1 m from facade |
NM3 |
Jockey Club Lei Yue Mun Plus |
Fenced Road on Ground Floor |
1 m from facade |
NM4 |
No. 21C, Lei Yue Mun Hoi Pong Road East |
Fenced Road on Ground Floor |
1 m from facade |
The location of all original construction noise monitoring stations and the
alternative construction noise monitoring station are shown in Figure 2.1.
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Figure 2.1 Noise Monitoring Locations |
Noise measurements shall not be 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.
Table 2.4 Impact Noise Monitoring Equipment
Equipment |
Make and Model |
Sound Level Meter |
NTi Audio XL2 (Serial no.: A2A-13548-E0) |
Acoustic Calibrator |
Scarlet ST-120 |
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 2.5.
Table 2.5 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 |
75 dB(A) for residential areas; 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 D.
Referring to EM&A manual Section 4.6.1.1 construction noise monitoring should be carried out when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations. Noise monitoring were carried out at the monitoring locations sited at LYM in the reporting month. The below Table 2.6 summarized the results of the monitoring.
Table 2.6 Summary of Noise Monitoring Results in the Reporting Month
Noise in dB(A) |
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Leq 30min Daytime (7:00-19:00 on normal weekdays) |
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NM1 |
63.5 |
- |
67.3 |
NM2-A |
59.6 |
- |
65.1 |
NM3 |
61.8 |
- |
68.3 |
NM4 |
64.0 |
- |
69.7 |
No noise
monitoring exceedance was recorded in the reporting period.
As identified in the EIA Report, suspended sediment is the most critical water quality parameter caused by the dredging works. Marine water quality monitoring should be carried out during the dredging and filling operation to ensure that any unacceptable increase in suspended solids / turbidity and decrease in dissolved oxygen due to the dredging activities could be readily detected and timely action be taken to rectify the situation.
During the dredging (both capital and maintenance) and filling operation of the Project, water quality impact monitoring should be undertaken 3 days per week, at mid-flood and mid-ebb tides, with sampling / measurement at the designated monitoring stations. The locations for impact monitoring should be the same as those for baseline monitoring.
The impact water quality monitoring of the Project commenced on 14 September 2021.
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 marine water quality monitoring
Parameters |
Unit |
Abbreviation |
In-situ measurements |
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Dissolved oxygen* |
mg/L |
DO |
Temperature |
oC |
- |
pH |
- |
- |
Turbidity* |
NTU |
- |
Salinity |
mg/L |
- |
Laboratory measurements |
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Suspended Solids* |
mg/L |
SS |
Notes: * Key Parameters shown in EM&A manual Table 5.1.
For 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).
pH Measurement Instrument - The instrument should consist of a potentiometer, a glass electrode, a reference electrode and a temperature-compensating device. It should be readable to 0.1 pH in a range of 0 to 14. Standard buffer solutions of at least pH 7 and pH 10 should be used for calibration of the instrument before and after use.
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.
Sample Containers and Storage - Water samples for SS should be stored in high density polythene bottles with no preservative added, packed in ice (cooled to 4 °C without being frozen) and delivered to the laboratory and analyzed as soon as possible after collection. Sufficient volume of samples should be collected to achieve the detection limit.
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.
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.
Calibration certificate for the water quality monitoring equipment is attached in Appendix H.
All in situ monitoring instruments will be 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 will be checked with certified standard solutions before each use.
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.
All laboratory work shall be carried out in a 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 24 hours 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.
Detailed testing methods, pre-treatment procedures, instruments use, Quality Assurance / Quality Control (QA/QC) details (such as blank, spike recovery, number of replicate samples per batch, etc.), detection limit and accuracy were submitted to EPD for approval on 3 February 2021 prior to the commencement of monitoring programme. EPD may also request the laboratory to carry out analysis of known standards provided by EPD for quality assurance. The QA / QC shall be in accordance with the requirements of HOKLAS or international accredited scheme. The QA/ QC results shall be reported. The testing methods and related proposal were checked and certified by IEC before submission to EPD for approval.
Parameters for laboratory measurements, their standard methods and their detection limits are presented in Table 3.2.
Table 3.2 Laboratory measurements, standard methods and corresponding detection limits of marine water quality monitoring
Parameter |
Standard Method |
Detection Limit |
Accuracy |
Suspended Solids (mg/L) |
APHA 2540D |
1.0* |
±17% |
Remark *: Albeit the selected HOKLAS accredited laboratories’ standard testing method of total suspended solid according to APHA Method 2540D is capable of reporting the results to 1 mg/L, the laboratory advised that results reported between 1 and 2 mg/L shall be considered to be used as reference value and receive no HOKLAS accreditation for this particular range of result.
If exceedances were found during water monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix G.
The water quality monitoring locations for baseline are in accordance to the EM&A Manual and detailed in Table 3.3 below. The water quality monitoring schedule should be submitted to EPD at least 1 week before the first day of the monitoring month.
Table 3.3 Location of Water Quality Monitoring Station
Station |
Easting |
Northing |
Description |
C1 |
842134 |
816765 |
Control Station |
C2 |
842946 |
816172 |
Control Station |
M1 |
842605 |
816433 |
Coral Communities (Impact Monitoring Station) |
M2 |
842329 |
816615 |
100m away from the dredging site (Impact Monitoring Station) |
M3 |
842639 |
816410 |
Coral Communities (Impact Monitoring Station) |
M4 |
842515 |
816878 |
Sam Ka Tsuen Typhoon Shelter (Impact Monitoring Station) |
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Figure 3.1 Water quality monitoring locations under EM&A Manual |
During periods when there are dredging or filling works, impact monitoring should be undertaken at the monitoring stations as shown in Figure 3.1 and Table 3.3 three days per week during the construction phase after the commencement of marine construction works and dredging or filling activities. Monitoring at each station would be undertaken at both mid-ebb and mid-flood tides on the same day. The interval between two sets of monitoring would not be 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.
Due to typhoon signal no. 3 (Nalgae) was hoisted from 31 Oct at 16:20 to 2 Nov 2022 at 13:40, typhoon signal no. 8 (Nalgae) was hoisted from 2 Nov at 13:40 to 3 Nov 2022 at 02:40 and typhoon signal no. 3 (Nalgae) was hoisted from 3 Nov at 05:20 to 3 Nov 2022 at 06:20, water quality monitoring was canceled on 1 and 3 Nov 2022.
For water quality monitoring, each station will be sampled and measurements/ water samples will 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.
Based on the baseline water quality monitoring data and the derivation criteria specified in the Baseline Monitoring Report, the Action/Limit Levels have been derived for the Project and presented in Table 3.4.
Table 3.4 Derived Action and Limit Levels for Water Quality Monitoring
Parameters |
Action |
Limit |
During the Dredging and Filling Operation of the Project |
||
DO in mg/L |
Surface and Middle 7.95 mg L-1 Bottom 7.91 mg L-1 |
Surface and Middle 4 mg L-1 Bottom 2 mg L-1 |
SS in mg/L (Depth-averaged) |
6.73 mg L-1 or 120% of control station’s SS at the same tide of the same day |
17.60 mg L-1 or 130% of control station’s SS at the same tide of the same day and specific sensitive receiver water quality requirements (e.g. required SS level for concerned seawater intakes) |
Turbidity in NTU (Depth-averaged) |
7.42 NTU or 120% of control station’s SS at the same tide of the same day compared with corresponding data from control station |
7.79 NTU or 130% of control station’s SS at the same tide of the same day compared with corresponding data 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 and Salinity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.
The ET of the Project had conducted the baseline water monitoring between 15 April 2021 to 11 May 2021 at all six designated monitoring stations (i.e. C1, C2, M1, M2, M3 and M4). The monitoring results was presented in Baseline Water Quality Monitoring Report separately.
The commencement of marine construction activities for the Project is expected to be commenced in mid-September 2021 and the impact water quality monitoring of the Project commenced on 14 September 2021.
The impact water quality monitoring was conducted at all six monitoring stations (i.e. C1, C2, M1, M2, M3 and M4). The monitoring results are summarized in Table 3.5. Details of water quality monitoring results are presented in Appendix I.
Table 3.5 Summary of Water Quality Monitoring Results in the Reporting Month
Location
|
Parameters |
||||||||
Dissolved Oxygen (mg/L) |
Turbidity |
Suspended Solids |
|||||||
S&M(i) |
B(i) |
||||||||
Mid-Flood |
Mid-Ebb |
Mid-Flood |
Mid-Ebb |
Mid-Flood |
Mid-Ebb |
Mid-Flood |
Mid-Ebb |
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C1 |
Avg. |
8.59 |
8.54 |
8.61 |
8.53 |
4.02 |
4.70 |
6 |
8 |
Min. |
8.16 |
8.14 |
8.18 |
8.13 |
3.25 |
3.75 |
3 |
3 |
|
Max. |
9.02 |
8.90 |
9.06 |
8.94 |
4.73 |
5.98 |
16 |
17 |
|
C2 |
Avg. |
8.57 |
8.48 |
8.57 |
8.49 |
4.62 |
4.03 |
8 |
7 |
Min. |
8.23 |
8.10 |
8.21 |
8.11 |
3.74 |
2.85 |
5 |
3 |
|
Max. |
8.86 |
9.09 |
8.86 |
9.07 |
5.45 |
5.18 |
13 |
16 |
|
M1 |
Avg. |
8.57 |
8.66 |
8.56 |
8.68 |
3.58 |
3.46 |
10 |
8 |
Min. |
8.07 |
8.15 |
8.06 |
8.14 |
2.71 |
2.61 |
3 |
3 |
|
Max. |
9.08 |
9.15 |
9.05 |
9.13 |
4.69 |
5.22 |
18 |
16 |
|
M2 |
Avg. |
8.75 |
8.64 |
8.73 |
8.66 |
3.28 |
3.40 |
8 |
8 |
Min. |
8.19 |
8.22 |
8.24 |
8.23 |
2.60 |
2.10 |
3 |
3 |
|
Max. |
9.21 |
9.12 |
9.28 |
9.10 |
4.18 |
4.79 |
17 |
16 |
|
M3 |
Avg. |
8.51 |
8.39 |
8.54 |
8.36 |
3.48 |
3.48 |
9 |
9 |
Min. |
8.14 |
8.10 |
8.20 |
8.06 |
2.37 |
2.55 |
3 |
3 |
|
Max. |
8.93 |
8.79 |
8.94 |
8.80 |
4.77 |
4.64 |
17 |
19 |
|
M4 |
Avg. |
8.69 |
8.63 |
8.69 |
8.63 |
3.37 |
3.59 |
8 |
10 |
Min. |
8.23 |
8.15 |
8.30 |
8.16 |
2.32 |
2.33 |
3 |
3 |
|
Max. |
9.19 |
9.36 |
9.21 |
9.31 |
4.91 |
5.20 |
16 |
20 |
Notes:
i. " S&M": Surface and Middle, “B”: Bottom.
Water quality monitoring exceedances were recorded in the reporting period and summarized below. Total of 22 action level and 2 limit level exceedances on suspended solid (SS) on 5, 8, 10, 12, 15, 17, 19, 22 and 26 November 2022. After investigation the overall exceedances on SS are due to the localized water quality affected by non-project related events.
Strong monsoon signal recorded on 5, 22 Nov 2022 and rainfall recorded on 8, 26 Nov 2022. Inclement weather possibly led to release of SS content form the soil of the nearby lands.
Localized water quality in typhoon shelter affected Impact Station M4 in 12, 17 Nov 2022 whereas other impact stations located close to construction site were no exceedance.
General high SS in Lei Yue Mun waters was recorded on 12, 15 Nov 2022, the SS level upstream control stations exceeded 95%-ile of baseline data.
For SS exceedance on 10, 19 Nov 2022, according to the field observation by sampling team during sampling event, no silt plume was observed in the Project site. Therefore, it is considered the exceedance is non-project related.
Regarding the open spaces of the construction sites was deposited with stockpile of soil which may contribute to the discharge of muddy water during rainstorm, mitigation measure from Contractor have been enhanced by providing additional silt curtain on 25 Nov 2022. Regular inspection on the silt curtain condition by the contractor to ensure the silt curtains are deployed properly and to maintain the performance of the silt curtains.
Based on the above, ET, IEC and ER followed event and actions plans in the EM&A manual, to identify reasons and source of impact, closely monitor site conditions with Contractors and ensure mitigation measures are properly implemented.
Date |
Tidal |
Location |
Parameter |
Monitoring Result |
AL (mg/L) |
LL (mg/L) |
5/11/2022 |
Mid-Flood |
M4 |
SS |
14.3 |
13.6 |
17.6 |
5/11/2022 |
Mid-Ebb |
M1 |
SS |
13.8 |
6.7 |
17.6 |
5/11/2022 |
Mid-Ebb |
M2 |
SS |
15.3 |
6.7 |
17.6 |
5/11/2022 |
Mid-Ebb |
M3 |
SS |
15.3 |
6.7 |
17.6 |
5/11/2022 |
Mid-Ebb |
M4 |
SS |
14.8 |
6.7 |
17.6 |
|
|
|
|
|
|
|
8/11/2022 |
Mid-Flood |
M2 |
SS |
17.0 |
10.6 |
17.6 |
8/11/2022 |
Mid-Flood |
M3 |
SS |
12.5 |
10.6 |
17.6 |
8/11/2022 |
Mid-Ebb |
M1 |
SS |
12.5 |
6.7 |
17.6 |
8/11/2022 |
Mid-Ebb |
M2 |
SS |
11.0 |
6.7 |
17.6 |
8/11/2022 |
Mid-Ebb |
M3 |
SS |
10.7 |
6.7 |
17.6 |
8/11/2022 |
Mid-Ebb |
M4 |
SS |
15.0 |
6.7 |
17.6 |
|
|
|
|
|
|
|
10/11/2022 |
Mid-Flood |
M1 |
SS |
15.3 |
6.7 |
17.6 |
10/11/2022 |
Mid-Flood |
M2 |
SS |
13.6 |
6.7 |
17.6 |
10/11/2022 |
Mid-Flood |
M3 |
SS |
16.0 |
6.7 |
17.6 |
10/11/2022 |
Mid-Flood |
M4 |
SS |
12.0 |
6.7 |
17.6 |
|
|
|
|
|
|
|
12/11/2022 |
Mid-Flood |
M1 |
SS |
17.0 |
15.3 |
17.6 |
12/11/2022 |
Mid-Flood |
M4 |
SS |
16.0 |
15.3 |
17.6 |
12/11/2022 |
Mid-Ebb |
M4 |
SS |
20.3 |
20.0 |
21.7 |
|
|
|
|
|
|
|
15/11/2022 |
Mid-Flood |
M1 |
SS |
18.3 |
10.0 |
17.6 |
15/11/2022 |
Mid-Flood |
M2 |
SS |
12.5 |
10.0 |
17.6 |
15/11/2022 |
Mid-Flood |
M3 |
SS |
16.8 |
10.0 |
17.6 |
|
|
|
|
|
|
|
17/11/2022 |
Mid-Ebb |
M4 |
SS |
18.8 |
10.8 |
17.6 |
|
|
|
|
|
|
|
19/11/2022 |
Mid-Ebb |
M2 |
SS |
6.8 |
6.7 |
17.6 |
|
|
|
|
|
|
|
22/11/2022 |
Mid-Flood |
M1 |
SS |
11.5 |
9.0 |
17.6 |
22/11/2022 |
Mid-Flood |
M2 |
SS |
10.5 |
9.0 |
17.6 |
|
|
|
|
|
|
|
26/11/2022 |
Mid-Ebb |
M1 |
SS |
7.0 |
6.7 |
17.6 |
26/11/2022 |
Mid-Ebb |
M2 |
SS |
10.5 |
6.7 |
17.6 |
26/11/2022 |
Mid-Ebb |
M3 |
SS |
8.8 |
6.7 |
17.6 |
26/11/2022 |
Mid-Ebb |
M4 |
SS |
12.5 |
6.7 |
17.6 |
Notes: SS: Suspended Solids
Background
Lei Yue Mun (LYM) is one of the most popular tourist attractions in Hong Kong, for its pleasant seaside ambience and excellent seafood. LYM was included in the Tourism Commission (TC)’s Tourism District Enhancement Programme to enrich Hong Kong’s appeal to visitors. In 2003, initial minor improvements were completed along the LYM waterfront, and further improvement of facilities along the LYM waterfront was planned.
The Project, Lei Yue Mun Waterfront Enhancement Project is a Designated Project under the Environmental Impact Assessment Ordinance (EIAO). An EIA Report under Agreement No. CE 54/2015 (EP) (Report No.: AEIAR-219/2018) for the Project was approved under EIAO on 26 October 2018 in accordance with the EIA Study Brief (No. ESB-287/2015) and the Technical Memorandum on Environmental Impact Assessment Process (EIAO-TM). The corresponding Environmental Permit was issued (EP no.: EP-564/2018) by the Director of Environmental Protection (DEP) on 10 December 2018.
The works to be executed under Contract No. CV/2020/09 Construction of Lei Yue Mun Public Landing Facility (hereinafter called “the Contract”) mainly comprise the construction of a public landing facility, a breakwater, and structural improvement works to an existing viewing platform and a lookout point. Dredging and excavation works for berthing of vessels at the new public landing facility will be involved, which might directly affect the hard coral colonies. Thus, a coral baseline survey that involves a detail coral mapping survey shall be conducted to ascertain the location, sizes, species and health status of the corals with reference to the extent of marine ecological survey indicated at Figure 9.1 of the EIA Report under the Contract.
Coral mapping surveys were conducted in March 2021, forty-four (44) octocoral colonies recorded on movable boulders shall be translocated to a coral recipient site Fat Tong Chau (FTC), Junk Bay.
Coral translocation was conducted on 20 and 21 May 2021, a total of forty-seven (47) octocoral colonies attached to movable boulders were translocated to the coral recipient site FTC, Junk Bay.
A Post-translocation Coral Survey was conducted on 21 May 2021, to monitor the health condition of the tagged colonies after coral translocation, including the tagged colonies from the donor site (i.e. the proposed dredging area at LYM) and also the tagged naturally occurring corals at the coral recipient site at Fat Tong Chau (FTC), Junk Bay.
Followed by the Post-translocation Coral Survey, Post-translocation monitoring will be conducted quarterly for one year.
Following coral translocation which was undertaken on 20 and 21 May 2021, 10 selected translocated coral colonies as well as the 10 tagged natural coral colonies at the recipient site will be monitored once every 3 months for a period of 12 months. The monitoring team will record the following parameters (using the same methodology adopted during the pre-translocation survey): size, presence, survival, health conditions (percentage of mortality) and percentage of sediment of each translocated coral colonies. The general environmental conditions including weather, sea, and tidal conditions of the coral recipient site will also be monitored.
Photographic records of the translocated and natural coral colonies will be taken as far as possible maintaining the same aspect and orientation as photographs taken for the pre-translocation surveys. All the tags for marking the translocated and natural coral colonies will be removed / retrieved once the monitoring programme is completed.
The results of the post-translocation monitoring surveys should be reviewed with reference to findings of the baseline survey and the data from original colonies at the recipient site.
If, during the post-translocation monitoring, observations of any die-off / abnormal conditions of the translocated corals are made, the ET will inform the Contractor, Independent Environmental Checker (IEC)/ Environmental Project Office (ENPO), Agriculture, Fisheries and Conservation Department (AFCD) and in liaison with AFCD investigate any measures needed.
The results of the post-translocation monitoring will be reviewed with reference to findings of the baseline survey and the data from naturally occurring colonies at the recipient site and evaluated against Action and Limit Levels. Evaluation will be based on recorded changes in percentage of partial mortality of the corals. Action and Limit Levels are defined in Table 4.2.1 below.
Table 4.2.1 Action and Limit Levels for Coral Post-translocation Monitoring
Parameter |
Action Level Definition |
Limit Level Definition |
Mortality |
If during Post-translocation Monitoring a 15% increase in the percentage of partial mortality on the corals occurs at more than 20% of the translocated coral colonies that are not recorded on the original corals at the receptor site, then the Action Level is exceeded. |
If during the Post-translocation Monitoring a 25% increase in the percentage of partial mortality at more than 20% of the translocated coral colonies occurs that is not recorded at the original corals at the recipient site, then the Limit Level is exceeded. |
Post-translocation monitoring results will be evaluated against Action and Limit Levels. Evaluation will be based on recorded changes in percentage of partial mortality of the corals. Action and Limit Levels are defined in Table 4.2.1.
If the defined Action Level or Limit Level for coral monitoring as listed in Table 4.2.1 is exceeded, the actions as set out in Table 4.2.2 will be implemented.
Table 4.2.2 Event and Action Plan for Coral Post-translocation Monitoring
Event |
Action |
||
ET Leader |
IEC |
Main Contractor |
|
Action Level Exceedance |
1. Check monitoring data; 2. Identify the source(s) of impact; 3. Inform the IEC and main contractor of the findings; 4. Increase the monitoring to at least once a month to confirm findings; 5. Liaise with AFCD to investigate any mitigation measures needed; and 6. Propose mitigation measures for consideration. |
1. Discuss monitoring with the ET; 2. Review proposals for additional monitoring and any other measures and advise the main contractor accordingly. |
1. Discuss with the IEC additional monitoring requirements and any other measures proposed by the ET; 2. Make the agreement on the measures to be implemented. |
Limit Level Exceedance |
1. Undertake Steps 1-5 as in the Action Level Exceedance. If further exceedance of Limit Level, propose enhancement measures for consideration. |
1. Discuss monitoring with the ET; 2. Review proposals for additional monitoring and any other measures and advise the main contractor accordingly. |
1. Discuss with the IEC additional monitoring requirements and any other measures proposed by the ET; 2. Make the agreement on the measures to be implemented. |
The final session of Post-translocation Monitoring was performed on 26 May 2022 and fulfilled the approved Coral Translocation Plan requirement (i.e. monitoring will be conducted quarterly for one year after the coral translocation work.) and additional monitoring will be conducted after the construction work.
No Post-translocation Monitoring was performed in the reporting month.
The waste generated from this Project 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 project 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 Project, the quantities of different types of waste generated in the reporting month are presented in Table 5.1.
Table 5.1 Quantities of Waste Generated from the Project as of Nov 2022
No noise-related exceedance was recorded in the reporting period.
Water monitoring exceedances were record in reporting period and the follow-up would be present in the next monthly EM&A report.
No notification of summons and prosecution was received in the reporting period.
Statistics on complaints and regulatory
compliance are summarized in Appendix J.
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 3, 10, 17 and 24 November 2022.
Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections and during the reporting period are summarized in Table 7.1.
Table 7.1 Site Observations
Date |
Environmental Observations |
Follow-up Status |
Follow-up action of last month site observation(s) |
||
-- |
1. Nil. |
1. -- |
Site observation(s) in reporting month |
||
3 Nov 22 |
CEDD Silt curtain was observed not intact. Silt curtain condition should be checked and improved.
ASD 1. Nil. |
1. Rectified.
1. N.A. |
10 Nov 22 |
CEDD 1. Nil.
ASD 1. Nil. |
1. N.A.
1. N.A. |
17 Nov 22 |
CEDD 1. A part joints of the silt curtain was not intact, silt curtain should be good condition.
ASD 1. Nil. |
1. Rectified.
1. N.A. |
24 Nov 22 |
CEDD 2. Nil.
ASD 1. Nil. |
1. N.A.
1. N.A. |
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 B.
Works to be undertaken in the next reporting month are:
Works Description |
Location |
Contract No. CV/2020/09 |
|
Rock excavation near sea-side of landing |
Landing Facility |
Construction for vertical seawall at landing |
Landing Facility |
Construction of sloping seawall at landing |
Landing Facility |
Construction of pile cap at landing facility |
Landing Facility |
Trim down excessive casing & H-section along at breakwater |
Breakwater Area |
Construction of pile cap and linking structure at breakwater |
Breakwater Area |
Structural monitoring for nearby existing structures |
Existing Structures to be Potential Effected by Construction Activities |
|
|
Contract No. SS J521 |
|
Tree removal |
Site |
The major environmental impacts brought by the above construction works will include:
· Impact on water quality from rock excavation near sea-side landing
· Construction dust and noise generation from excavation and construction works
· Waste generation from tree removal and excavation
The key environmental mitigation measures for the Project in the coming reporting period associated with the above construction works will include:
· High loading of SS in site run-off should be prevented through proper site management by the contractor.
· Seawall modification works should be undertaken during low tide, when the water level is low.
· Minimized surface run-off in adjacent marine waters and programmed to minimize soil excavation works during inclement weather.
· Silt curtains should be deployed enclosing the dredging operation. Regular inspection on the silt curtain on the silt curtain condition by the contractor should be carried out.
· Reduction of noise from equipment and machinery on-site
· Sorting and storage of general refuse and construction waste
· The dredging rate shall not exceed 100 m3 per hour with a maximum working period of 12 hours per day throughout the construction phase and operation phase.
Referring to EM&A Manual Section 4.6.1.1, the impact noise and water quality monitoring should be carried out at all the designated monitoring stations when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations.
This is the 19th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 November to 30 November 2022, in accordance with the EM&A Manual and the requirement under EP-564/2018.
No noise-related exceedance was recorded in the reporting period.
Water monitoring exceedances were record in reporting period and the follow-up would be present in the next monthly EM&A report.
Weekly environmental site inspection was conducted during the reporting period. No major deficiency was observed during site inspection. The environmental performance of the project was therefore considered satisfactory.
No environmental complaint was received in the reporting period.
No notification of summons or prosecution was received since commencement of the Contract.
Agreed with the EIA prediction in Section 14.2.4.4, with the adoption of good site practice, quiet PME and noise barriers/enclosure, the noise levels at all the representative NSRs complied with the EIAO-TM noise criteria. The comparison between the EM&A data in the reporting month and the most updated noise level prediction as presented in the Noise Mitigation Plan (NMP) is presented in Table 9.1.
Table 9.1 Comparison between the EM&A Data in the Reporting Month and the Updated Noise Level Predictions
EIA Noise Assessment Point (NAP) |
Prediction [dB(A)] |
EM&A Monitoring Station |
Noise Levels [db(A)] |
||
HPRC V1 |
62-72 |
NM1 |
63.5 |
- |
67.3 |
HPRE 75B* |
55-75 |
NM2-A |
59.6 |
- |
65.1 |
LYMP |
70 |
NM3 |
61.8 |
- |
68.3 |
HPRE 21C |
67-75 |
NM4 |
64.0 |
- |
69.7 |
*NM2-A is located between NAPs HPRE 75B and HPRE 81, with lack of data in the NMP, the EIA prediction was used instead.
The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.