Revision History

 

 

 

Content

 

1.     Basic Project Information. 7

2.     Marine Water Quality Monitoring. 16

3.     Noise Monitoring. 31

4.     Waste. 37

5.     Coral 39

6.     Marine Mammal 56

7.     White-Bellied Sea Eagle. 71

8.     Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions 75

9.     EM&A Site Inspection. 81

10.   Future Key Issues 83

11.   Conclusion and Recommendations 84

 

Appendix A	Master Programme
Appendix B	Summary of Implementation Status of Environmental Mitigation
Appendix C	Impact Monitoring Schedule of the Reporting Month
Appendix D	Water Quality Monitoring Data
Appendix E	HOKLAS Laboratory Certificate
Appendix F	Water Quality Equipment Calibration Certificate
Appendix G	Event/ Action Plan for Water Quality Exceedance
Appendix H	Noise Monitoring Equipment Calibration Certificate
Appendix I	Event/Action Plan for Noise Exceedance
Appendix J	Noise Monitoring Data
Appendix K	Waste Flow Table
Appendix L	Event/Action Plan for Coral Monitoring
Appendix M	Event/Action Plan for White-bellied Sea Eagle Monitoring
Appendix N	Exceedance Report
Appendix O	Complaint Log
Appendix P	Impact Monitoring Schedule of Next Reporting Month

 

 

Executive Summary

Introduction

A1.      The Project, Integrated Waste Management Facility (IWMF), is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is currently governed by a Further Environmental Permit (FEP No. FEP-01/429/2012/A) for the construction and operation of the Project.

A2.      In accordance with the Updated Environmental Monitoring and Audit (EM&A) Manual for the Project, 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 Project.

A3.      This is the 9th Monthly EM&A Report, prepared by ASCL, for the Project summarizing the monitoring results and audit findings of the EM&A programme at and around Shek Kwu Chau (SKC) during the reporting period from 1 March 2019 to 31 March 2019.

Summary of Main Works Undertaken & Key Mitigation Measures Implemented

A4.      Key activities carried out in this reporting period for the Project included the following:

·          Marine Site Investigation Works

·          Laying of Geotextile and Sand Blanket for DCM Injection Works

·          DCM Installation Works

·          Cone Penetration Test

·          Dredging Works

A5.      The major environmental impacts brought by the above construction activities include:

·          Water quality impact from DCM installation, laying of sand blanket and dredging operation

·          Disturbance and possible trapping of Finless Porpoise by silt curtains

A6.      The key environmental mitigation measures implemented for the Project in this reporting period associated with the construction activities include:

·          Reduction of noise from equipment and machinery on-site;

·          Installation of silt curtains for DCM installation, sand blanket laying works, and dredging works;

·          Sorting, recycling, storage and disposal of general refuse and construction waste;

·          Management of chemicals and avoidance of oil spillage on-site; and

·          Implementation of cluster MMEZ (Marine Mammal Exclusion Zone) and inspection of enclosed environment within silt curtains as per DMPFP (Detailed Monitoring Programme of Finless Porpoise)

·          Regulation on rate and means for dredging works as stipulated in FEP Clause 2.17 – 2.21

·          Daily site audit and monitoring by ET during dredging work as stipulated in FEP Clause 2.21A

·          Storage, handling and disposal of dredged materials according to Dumping At Sea Ordinance (DASO)

 

Summary of Exceedance & Investigation & Follow-up

A7.      The EM&A works for construction noise, water quality, construction waste, coral, marine mammal and White-Bellied Sea Eagle (WBSE) were conducted during the reporting period in accordance with the Updated EM&A Manual.

A8.      No exceedance of the Action or Limit Levels in relation to the construction noise, construction waste, coral and WBSE monitoring was recorded in the reporting month.

A9.      Twenty-two and three of the General & Regular DCM water quality monitoring results for Suspended Solid (SS) obtained during the reporting period had exceeded the relevant Action and Limit Levels respectively; six and twenty-eight of the Initial Intensive DCM water quality monitoring results for Suspended Solid (SS) obtained during the reporting period had exceeded the relevant Action and Limit Levels respectively, where findings from investigations carried out immediately for each of the exceedance cases had showed that these exceedances were unrelated to the Project.

A10.   No project-related Action Level & Limit Level exceedance was recorded.

A11.   Weekly site inspections of the construction works by ET were carried out on 4, 12, 20 & 26 March 2019 to audit the mitigation measures implementation status. Monthly joint site inspection was carried out on 20 March 2019 by ET and IEC. Night time joint site inspection was carried on 4 March 2019 by ET and IEC. Observations have been recorded in the site inspection checklists and provided to the contractors together with the appropriate follow-up actions where necessary.

Complaint Handling and Prosecution

A12.   No project-related environmental complaint was received during the reporting period.

A13.   Neither notifications of summons nor prosecution was received for the Project.

Reporting Change

A14.   There were no changes to be reported that may affect the on-going EM&A programme.

Summary of Upcoming Key Issues and Key Mitigation Measures

A15.   Key activities anticipated in the next reporting period for the Project will include the following:

·          Laying of Geotextile and Sand Blanket for DCM Injection Works

·          DCM Installation Works

·          Coring of DCM samples

·          Static Loading Test

·          Cone Penetration Test

·          Dredging Works

A16.   The major environmental impacts brought by the above construction activities will include:

·          Water quality impact form DCM installation, laying of sand blanket and dredging operation

·          Disturbance and possible trapping of Finless Porpoise by silt curtains

A17.   The key environmental mitigation measures for the Project in the coming reporting period associated with the construction activities will include:

·          Reduction of noise from equipment and machinery on-site;

·          Installation of silt curtains for DCM installation, sand blanket laying works and dredging works;

·          Sorting, recycling, storage and disposal of general refuse and construction waste;

·          Management of chemicals and avoidance of oil spillage on-site, especially under heavy rains and adverse weather; and

·          Implementation of cluster MMEZ and inspection of enclosed environment within silt curtains as per DMPFP

·          Regulation on rate and means for dredging works as stipulated in FEP Clause 2.17 – 2.21

·          Daily site audit and monitoring by ET during dredging work as stipulated in FEP Clause 2.21A

·          Storage, handling and disposal of dredged materials according to Dumping At Sea Ordinance (DASO)

 

 

 

1.    Basic Project Information 1.1         Background 1.1.1        The Government of Hong Kong SAR will develop the Integrated Waste Management Facilities (IWMF) Phase 1 (hereafter “the Project”) with incineration to achieve substantial bulk reduction of unavoidable municipal solid waste (MSW) and to recover energy from the incineration process. The IWMF will be on an artificial island to be formed by reclamation at the south-western coast of Shek Kwu Chau. Keppel Seghers – Zhen Hua Joint Venture (KSZHJV) was awarded the contract under Contract No. EP/SP/66/12 Integrated Waste Management Facilities Phase 1 to construct and operate the Project. 1.1.2        An environmental impact assessment (EIA) study for the Project has been conducted and the EIA Report was approved under the Environmental Impact Assessment Ordinance on 17 January 2012. An Environmental Permit (EP) (EP No.: EP-429/2012) was granted to EPD on 19 January 2012 for the construction and operation of the Project. Subsequently, the EP was amended (EP No.: EP-429/2012/A) and a further EP (FEP) (EP No.: FEP-01/429/2012/A) was granted to the Keppel Seghers – Zhen Hua Joint Venture (KSZHJV) on 27 December 2017. 1.1.3        The key design and construction elements of the Project include the Design and the Works including but not limited to the design, engineering procurement, construction, testing and commissioning of the Facility including:

·          Ground Treatment works;

·          Seawall and Breakwater construction;

·          Non-dredged Reclamation;

·          Other Marine works and Harbour and Port Facilities,

·          Site formation,

·          Municipal Solid Waste (MSW) Treatment Processes,

·          Energy Recovery for Power Generation and Surplus Electricity export,

·          Wastewater treatment process,

·          Desalination and water treatment process,

·          Civil works;

·          Building and Structural works,

·          Electrical and Mechanical works,

·          Building Services,

·          Architectural and Landscaping works, and

·          All other design and works required for the operation and maintenance of the Facility according to the Contract requirements

1.1.4        The location of the IWMF near Shek Kwu Chau (SKC) and general layout of IWMF are shown in Figure 1.1 and Figure 1.2 respectively.

Figure 1.1 Location of the IWMF at the Artificial Island near SKC

Figure 1.2 General Layout of the IWMF at the Artificial Island near SKC

1.2         The Reporting Scope 1.2.1        This is the 9th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 March to 31 March 2019. 1.3         Project Organization 1.3.1        The Project Organization structure for Construction Phase is presented in Figure 1.3.

Figure 1.3 Project Organization Chart

1.3.2        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.
Keppel Seghers – Zhen Hua Joint Venture	Project Manager	Kenny Yu	2192-0606
Acuity Sustainability Consulting Limited	Environmental Team Leader	Robin Ho	2698-6833
ERM-Hong Kong, Limited	Independent Environmental Checker	Mandy To	2271-3000

1.4         Summary of Construction Works 1.4.1        Details of the major construction activities undertaken in this reporting period are shown in Table 1.2 and Figure 1.4 below. The construction programme is presented in Appendix A.

Table 1.2 Summary of the Construction Activities Undertaken during the Reporting Month

Location of works	Construction activities undertaken	Remarks on progress
Seawall and breakwater locations	·     Marine site investigation works	·     Completed
Location of DCM Site Trial	·     Coring of DCM samples	·     Completed
Seawall locations	·     Collecting of Marine Sediment Samples	·     Completed
Location of DCM Static Loading Test	·     DCM installation	·     Completed
Seawall and berth area	·     Laying of Geotextile and Sand Blanket	·     73 out of 95 geotextiles were laid ·     Completed for sand blanket laying
Seawall and berth area	·     DCM installation ·     Dredging operation	·     On-going ·     524.534 m3 of dredged sediment in bulk quantity was dumped

Figure 1.4 Location of Major Construction Activities Undertaken during the Reporting Month

1.5         Summary of Environmental Status 1.5.1        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, Permit and Documentations

Permit/ Licences/ Notification	Reference	Validity Period	Remarks
Variation of Environmental Permit	EP-429/2012/A	Throughout the Contract
Further Environmental Permit	FEP-01/429/2012/A	Throughout the Contract
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA)	Ref No.: 428778	15/12/2017-22/09/2024
Wastewater Discharge Licence	-	-	Under Application
	-	-	Under Application
Chemical Waste Producer Registration	WPN0017-933-K3301-01	Throughout the Contract
	WPN5213-961-K3301-02	Throughout the Contract
Construction Noise Permit (24 hours)	GW-RS0018-19	15/01/2019 – 10/04/2019
Construction Noise Permit (24 hours)	GW-RS0251-19	27/03/2019 – 25/09/2019
Billing Account for Disposal of Construction Waste	A/C No.:7029768	Throughout the Contract
Marine Dumping Permit	EP/MD/19-094	20/02/2019 – 19/8/2019

1.5.2        The status for all environmental aspects is presented Table 1.4.

Table 1.4 Summary of Status for Key Environmental Aspects under the Updated EM&A Manual

Parameters	Status
Water Quality
Baseline Monitoring under Updated EM&A Manual and Detailed Plan on DCM	The baseline water quality monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under FEP Condition 3.4
Impact Monitoring	On-going
Regular DCM Monitoring	On-going
Initial Intensive DCM Monitoring	On-going, being scheduled from 11 February 2019 to 10 March 2019
Baseline Water Quality of wet season	Completed over 13 August 2018 to 7 September 2018
Noise
Baseline Monitoring	The baseline niose monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under FEP Condition 3.4
Impact Monitoring	On-going
Waste Management
Mitigation Measures in Waste Monitoring Plan	On-going
Coral
Pre-translocation Survey and Coral Mapping	The Coral Translocation Plan was submitted and approved by EPD under EP Condition 2.12
Coral Translocation	Completed on 28 March 2018
Post-Translocation Coral Monitoring	On-going, survey affected by missing of translocated and tagged coral colonies after typhoons in September 2018
Pre-construction Coral Survey and Tagging	Completed on 26 June 2018
Tagged Coral Monitoring	Survey obstructed due to missing of tagged coral colonies after typhoons in September 2018
Coral Survey and Re-tagging	Re-tagging at Indirect Impact Site was conducted on 23 November and Re-tagging at Control Site was conducted on 3 December 2018.
Post Re-tagging Coral Monitoring	On-going
Marine Mammal
Baseline Monitoring	The baseline marine mammal monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under FEP Condition 3.4
Impact Monitoring	On-going
White-bellied Sea Eagle
Baseline Monitoring	The baseline WBSE monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under FEP Condition 3.4
Impact Monitoring	On-going
Environmental Audit
Site Inspection covering Measures of Air Quality, Noise Impact, Water Quality, Waste, Ecological Quality, Fisheries, Landscape and Visual	On-going
Mitigation Measures in Marine Mammal Watching Plan (MMWP)	On-going
Mitigation Measures in Detailed Monitoring Programme on Finless Porpoise (DMPFP)	On-going
Mitigation Measures in Vessel Travel Details	On-going
Daily Site Audit and Monitoring for Dredging Work	On-going

1.5.3        Other than the EM&A works 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. 1.5.4        The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the Updated 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.

2.    Marine Water Quality Monitoring

2          

2.1         Water Quality Requirements 2.1.1        To ensure no adverse water quality impact, water quality monitoring is recommended to be carried out at the nearby water sensitive receivers (WSRs) during construction phase including proposed reclamation, breakwater construction, etc. 2.1.2        In accordance with the Updated EM&A Manual, impact water quality monitoring were conducted 3 days per week at mid-flood and mid-ebb tide to obtain impact water quality levels at the eleven monitoring stations during general water quality monitoring and fourteen monitoring stations during regular DCM monitoring for the construction period. 2.2         Water Quality Parameters, Time, Frequency 2.2.1        Dissolved Oxygen (DO), Turbidity, Suspended Solids (SS), Salinity and pH have been undertaken at the eleven monitoring stations during general water quality monitoring. Beside the above parameters, monitoring for Total Alkalinity, Current Velocity and Current Direction have been undertaken at all fourteen monitoring stations (including S1, S2 and S3) during regular DCM monitoring. While the same parameters monitored during regular DCM monitoring have been undertaken at twelve immediate upstream and downstream area to the DCM works location during intensive DCM monitoring. Intensive DCM monitoring was conducted on 2, 4, 6, 8 and 10 March 2019. 2.2.2        Current velocity and direction, DO, temperature, salinity, turbidity and pH have been measured in-situ and the SS, Total Alkalinity have been assayed in a HOKLAS laboratory. 2.2.3        In associate with the water quality parameters, other relevant data were also measured, such as monitoring location/position, time, water depth, sampling depth, tidal stages, weather conditions and any special phenomena or work underway nearby were also recorded. The monitoring schedule is provided in Appendix C. 2.2.4        Impact water quality monitoring was conducted 3 days per week in the reporting period. All parameters were monitored during mid-flood and mid-ebb tides at three water depths for general water quality monitoring. The interval between two sets of monitoring has not been less than 36 hours. 2.2.5        The initial intensive DCM monitoring programme has been conducted daily from 11-24 February 2019, and conducted every two days from 25 February to 10 March 2019. The actual duration of the initial DCM monitoring might extend beyond four weeks should there be any exceedances in specific-DCM parameters (Temperature & Alkalinity) of water quality action and limit levels. 2.2.6        Table 2.1 summarizes the monitoring parameters, frequency and duration of the impact water quality monitoring during construction phase.

 Table 2.1 Water Quality Monitoring Parameters, Frequency and Duration

Parameter, unit	Frequency	No. of Depths
·        Water Depth(m) ·        Temperature(oC) ·        Salinity(ppt) ·        pH (pH unit) ·        Dissolved Oxygen (DO)(mg/L and % of saturation) ·        Turbidity(NTU) ·        Suspended Solids (SS), mg/L ·        Total alkalinity ·        Current velocity ·        Direction	General water quality monitoring and Regular DCM monitoring: 3 days per week, at mid-flood and mid-ebb tides   *Intensive DCM monitoring: Daily in first 2 weeks, at mid-flood and mid-ebb tides. if no exceedance is recorded within the first two weeks, then the monitoring frequency can be reduced to every two days.	3 water depths: 1m below sea surface, mid-depth and 1m above sea bed. If the water depth is less than 3m, mid-depth sampling only. If water depth less than 6m, mid-depth may be omitted.

Note: *Exccedances referred to total alkalinity and temperature only. These should be confirmed by ET and verified by IEC as project-related. 2.3         Water Quality Monitoring Locations 2.3.1        Impact water quality monitoring was conducted at eleven monitoring locations (B1-B4, H1, C1, C2, F1, CR1, CR2 & M1) during general water quality monitoring and was conducted at fourteen water monitoring locations (B1-B4, H1, C1, C2, F1, S1-S3, CR1, CR2 & M1) during regular DCM monitoring, as shown in Figure 2.1. Initial intensive DCM water quality monitoring was conducted at twelve monitoring locations (UC1-UC2 & I1-I10) while UC1 & UC2 were representative upstream control stations and I1 to I10 were impact downstream stations as shown in Figure 2.2.

Figure 2.1 Water monitoring locations at Artificial Island near SKC

2.3.2        B1 to B4 are located at 4 beaches respectively at the southern shore of Lantau Island. Monitoring station H1 is located at the horseshoe crab habitat at northern SKC, while CR1 and CR2 are located at the coral communities at southwestern shore of SKC. Monitoring station F1 is located at the Cheung Sha Wan Fish Culture Zone while monitoring station M1 is located at Tung Wan at Cheung Chau. S1, S2 and S3 are located at the northern landing site, midway and southern landing site of the proposed submarine cable, respectively. S1, S2 and S3 are required for monitoring due to the laying of submarine cable. Control stations C1 and C2 at far field locations are for comparison. 2.3.3        Fourteen monitoring stations are listed in Table 2.2:

Table 2.2 - Locations of Marine Water Quality Stations

Monitoring station	Description	Easting	Northing
B1	Beach - Cheung Sha Lower	813342	810316
B2	Beach - Pui O	815340	811025
B3	Beach - Yi Long Wan	817210	808395
B4	Beach - Tai Long Wan	817784	808682
H1	Horseshoe Crab - Shek Kwu Chau	816477	806953
C1	Control Station	810850	806288
C2	Control Station	819421	808053
F1	Cheung Sha Wan Fish Culture Zone	818631	810966
S1	Submarine Cable Landing Site	814245	810335
S2	Submarine Cable	815076	807747
S3	Submarine Cable Landing Site	816420	805621
CR1	Coral	817144	805597
CR2	Coral	816512	805882
M1	Tung Wan	821572	807799

2.3.4        For initial intensive DCM monitoring, mobile impact monitoring stations shall be located within fixed distances from the DCM group works area to obtain water quality information in the immediate upstream and downstream area. A total of 12 nos. monitoring stations will be deployed with the following arrangement and illustrated in Figure 2.2:

·          Two monitoring stations upstream and at 150 m envelope of DCM group works area (Representative Control stations).

·          Five monitoring stations downstream and at 150 m envelope of DCM group works area (Impact 1 stations).

·          Five monitoring stations downstream and at 250 m envelope of DCM group works area (Impact 2 stations).

·          Monitoring stations should be at least 50 m apart;

·          Downstream monitoring stations should be perpendicular to the tidal direction.

Figure 2.2 Water monitoring locations during intensive DCM monitoring

2.4         Impact Monitoring Methodology 2.4.1        General water quality monitoring was conducted three days per week, at mid-flood and mid-ebb tides, at the designated water quality monitoring stations during the reporting period. Initial intensive DCM monitoring was performed daily in first 2 weeks, at mid-flood and mid-ebb tides, at the mobile impact monitoring stations locating within fixed distances from the DCM group works in the immediate upstream and downstream area. 2.4.2        The interval between 2 sets of monitoring was not less than 36 hours except for initial intensive DCM monitoring. Sampling was collected at three water depths, namely, 1m below water surface, mid-depth and 1m above seabed, except where the water depth is less than 6m, the mid-depth was omitted. If the water depth was less than 3m, only the mid-depth station was monitored. 2.4.3        All observations and results were recorded in the data record sheets in Appendix D. Duplicate in-situ measurements and water sampling were carried out in each sampling event. The monitoring probes were retrieved out of water after the first measurement and then redeployed for the second measurement. When the difference in value between the first and second readings of DO or turbidity is more than 25% of the value of the first reading, the reading was discarded and further readings were taken.

In-situ Measurement

2.4.4        Levels of DO, pH, temperature, turbidity and salinity would be measured in-situ by portable and weatherproof measuring instrument, e.g. YSI ProDSS and Horiba U-53 Multiparameter complete with cable and sensor. (Refer to http://www.ysi.com/ProDSS for YSI ProDSS technical specification and http://www.horiba.com/process-environmental/products/water-treatment-environment/details/u-50-multiparameter-water-quality-checker-368/ for Horiba U-53 technical specification ). Water current velocity and Water Current direction would be measured by portable and weatherproof current meter, e.g. SonTek Hydrosurveyor (Refer to https://www.sontek.com/media/pdfs/riversurveyor-s5-m9-brochure.pdf for SonTek Hydrosurveyor M9 technical specification). Parameters measured by in-situ measurement is tabulated in Table 2.3

Table 2.3 - Parameters Measured by In-situ Measurement

Parameter	Resolution	Range
Temperature	0.1 oC	-5-70 oC
Dissolved Oxygen (DO)	0.01 mg/L	0-50.0 mg/L
Turbidity	0.1 NTU	0-1000 NTU
pH	0.01 pH	pH 0-14
Salinity	0.01 ppt	0-40 ppt
Water Current Velocity	0.001m/s	±20m/s
Water Current Direction	±1o	±2o

 

Laboratory Analysis

2.4.5        Analysis of Total Alkalinity and SS should be carried out in a HOKLAS accredited laboratory, as shown in Appendix E. Sufficient water samples shall be collected at the monitoring stations for carrying out the laboratory determinations. The determination work should be started within 24 hours after collection of the water samples.  Analytical methods and detection limits for SS and total alkalinity are present in Table 2.4.

Table 2.4 - Analytical Methods Applied to Water Quality Samples

Parameter	Analytical method	Detection Level
Suspended Solids, SS	APHA 2540 Di	1 mg/L
Total Alkalinity	APHA 2320	0.01 mg/L

Footnote:  

        i.          "APHA 2540 D" stands for American Public Health Association Standard Methods for the Examination of Water and Wastewater, 23rd Edition.

 

Field Log

2.4.6        Other relevant data was recorded, such as: monitoring location / position, time, water depth, weather conditions and any special phenomena underway near the monitoring station. 2.5         Monitoring Equipment 2.5.1        Equipment used in the impact water quality monitoring programme is summarized in Table 2.5 below. Calibration certificates for the water quality monitoring equipment are attached in Appendix F.

Table 2.5 Impact Water Quality Monitoring Equipment

Monitored Parameter	Equipment	Brand and Model
DO, Temperature, Salinity, pH and Turbidity	Multi-functional Meter	YSI ProDSS
Coordinates	Positioning Equipment	Garmin GPSMAP 78s
Water depth	Water Depth Detector	Hummingbird 160 Portable
SS	Water Sampler	Wildco 2 L Water Sampler with messenger

2.5.2        Dissolved Oxygen and Temperature Measuring Equipment

The instrument was a portable and weatherproof DO probe mounted on the multi-functional meter complete with cable and sensor, and use a DC power source.  The equipment was capable of measuring:

 

l   A DO level in the range of 0 ‑ 50 mg/L; and

l   Temperature of -5 ‑ 70 degree Celsius.

2.5.3        Turbidity Measurement Instrument

The instrument was a portable and weatherproof turbidity-measuring probe mounted on the multi-functional meter using a DC power source. It had a photoelectric sensor capable of measuring turbidity between 0 - 1000 NTU.

2.5.4        pH Measurement Instrument

The probe was consisted of a potentiometer, a glass electrode, a reference electrode and a temperature-compensating device mounted on the multi-functional meter.  It was readable to 0.1 pH in a range of 0 to 14. Standard buffer solutions of at least pH 7 and pH 10 were used for calibration of the instrument before and after use.

2.5.5        Salinity Measurement Instrument

A portable salinometer mounted on the multi-functional meter capable of measuring salinity in the range of 0-40 parts per thousand (ppt) was provided for measuring salinity of the water at each monitoring location.

2.5.6        Sampler

The water sampler comprised a transparent PVC cylinder, with a capacity of not less than 2 litres, which can be effectively sealed with latex cups at both ends.  The sampler 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.

2.5.7        Sample Containers and Storage

Water samples for SS were 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 analysed as soon as possible after collection. Sufficient volume of samples was collected to achieve the detection limit stated in Table 2.4.

2.5.8        Water Depth Detector

A portable, battery-operated echo sounder was used for the determination of water depth at each designated monitoring station.  This unit could either be hand held or affixed to the bottom of the work boat, if the same vessel is to be used throughout the monitoring programme.

2.5.9        Monitoring Position Equipment

Hand-held digital Differential Global Positioning System (DGPS) with way point bearing indication and Radio Technical Commission for maritime (RTCM) Type 16 error message ‘screen pop-up’ facilities (for real-time auto-display of error messages and DGPS corrections from the Hong Kong Hydrographic Office) was provided and used to ensure that the water sampling locations were correct during the water quality monitoring work.

2.6         Maintenance and Calibration 2.6.1        The multi-functional meters were checked and calibrated before use. Multi-functional meters were certified by a laboratory accredited under HOKLAS or any other international accreditation scheme, and subsequently re-calibrated at three monthly intervals throughout all stages of the water quality monitoring. Responses of sensors and electrodes were checked with certified standard solutions before each use. Wet bulb calibration for a DO meter was carried out before commencement of monitoring and after completion of all measurements each day. Calibration was not conducted at each monitoring location as daily calibration is adequate for the type of DO meter employed. 2.6.2        Sufficient stocks of spare parts were provided and maintained for replacements when necessary. Backup monitoring equipment was prepared for uninterrupted monitoring during equipment maintenance or calibration during monitoring. 2.7         Action and Limit Levels 2.7.1        The Action and Limit Levels have been set based on the derivation criteria specified in the Updated EM&A Manual and Detailed DCM Plan, as shown in Table 2.6 below.

Table 2.6  Criteria of Action and Limit Levels for Water Quality

Parameters	Action	Limit
Construction Phase Impact Monitoring
DO in mg/L	≤ 5 %-ile of baseline data	≤ 4
SS in mg/L	≥ 95 %-ile of baseline data or 120% of control station’s SS at the same tide of the same day of measurement, whichever is higher	≥ 99 %-ile of baseline data or 130% of control station's SS at the same tide of the same day of measurement, whichever is higher
Turbidity in NTU	≥ 95 %-ile of baseline data or 120% of control station’s turbidity at the same tide of the same day of measurement, whichever is higher	≥ 99 %-ile of baseline data or 130% of control station's turbidity at the same tide of the same day of measurement, whichever is higher
Temperature in°C	1.8°C above the temperature recorded at representative control station at the same tide of the same day	2°C above the temperature recorded at representative control station at the same tide of the same day
Total Alkalinity in mg/L	≥ 95 %-ile of baseline data or 120% of representative control station at the same tide of the same day, whichever is higher	≥ 99 %-ile of baseline data or 130% of representative control station at the same tide of the same day, whichever is higher

2.7.2        Based on the baseline monitoring data and the derivation criteria specified above, the Action/Limit Levels have been derived and are presented in Table 2.7 and Table 2.8 for both dry seasons (October – March) and wet seasons (April – September).

Table 2.7  Derived Action and Limit Levels for Water Quality Monitoring (Dry Season)

Parameters	Action	Limit
Construction Phase Impact Monitoring
DO in mg/L	≤ 7.13	≤ 4
SS in mg/L	≥ 8 or 120% of control station’s SS at the same tide of the same day of measurement, whichever is higher	≥ 10 or 130% of control station's SS at the same tide of the same day of measurement, whichever is higher
Turbidity in NTU	≥ 5.6 or 120% of control station’s turbidity at the same tide of the same day of measurement, whichever is higher	≥ 12.8 or 130% of control station's turbidity at the same tide of the same day of measurement, whichever is higher
Temperature in°C	1.8°C above the temperature recorded at representative control station at the same tide of the same day	2°C above the temperature recorded at representative control station at the same tide of the same day
Total Alkalinity in mg/L	≥116 or 120% of control station’s Total Alkalinity at the same tide of the same day of measurement, whichever is higher	≥ 118 or 130% of control station’s Total Alkalinity at the same tide of the same day of measurement, whichever is higher

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.

Table 2.8  Derived Action and Limit Levels for Water Quality (Wet Season)

Parameters	Action	Limit
Construction Phase Impact Monitoring
DO in mg/L	≤ 5.28	≤ 4
SS in mg/L	≥ 12 or 120% of control station’s SS at the same tide of the same day of measurement, whichever is higher	≥ 14 or 130% of control station's SS at the same tide of the same day of measurement, whichever is higher
Turbidity in NTU	≥ 4.0 or 120% of control station’s turbidity at the same tide of the same day of measurement, whichever is higher	≥ 4.3 or 130% of control station's turbidity at the same tide of the same day of measurement, whichever is higher
Temperature in°C	1.8°C above the temperature recorded at representative control station at the same tide of the same day	2°C above the temperature recorded at representative control station at the same tide of the same day
Total Alkalinity in mg/L	≥ 116 mg/L or 120% of representative control station at the same tide of the same day, whichever is higher	≥ 118 mg/L or 130% of representative control station at the same tide of the same day, whichever is higher

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.

2.7.3        The Action and Limit (AL) levels for DCM-specific and other water quality parameters during initial intensive DCM monitoring with referring to Detailed Plan on Deep Cement Mixing, as shown in Table 2.9 and 2.10 below respectively.

Table 2.9 Action and Limit Levels for DCM-specific Water Quality Parameters (Intensive DCM Monitoring)

Parameters	Action	Limit
Construction Phase Impact Monitoring
Temperature in°C	1.8°C above the temperature recorded at representative control station at the same tide of the same day	2°C above the temperature recorded at representative control station at the same tide of the same day
Total Alkalinity in mg/L	95 percentile of baseline data or 120% of representative control station at the same tide of the same day, whichever is higher	99 percentile of baseline data or 130% of representative control station at the same tide of the same day, whichever is higher

Notes:

        i.          "Depth-averaged" is calculated by taking the arithmetic means of reading of all three depths.

       ii.          For Temperature and Total Alkalinity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

Table 2.10        Action and Limit Levels for Other Water Quality Parameters (Intensive DCM Monitoring)

Parameters	Action	Limit
Construction Phase Impact Monitoring
DO in mg/L (Surface and middle)	80% of representative control station at the same tide of the same day or 4mg/L, whichever is lower.	70% of representative control station at the same tide of the same day or 4mg/L, whichever is lower.
DO in mg/L (Bottom)	80% of representative control station at the same tide of the same day or 2mg/L, whichever is lower.	70% of representative control station at the same tide of the same day or 2mg/L, whichever is lower.
SS in mg/L	120% of representative control station at the same tide of the same day.	130% of representative control station at the same tide of the same day.
Turbidity in NTU

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 SS and Turbidity, non-compliance of the water quality limits occurs when monitoring result is higher than the limits.

2.7.4        If exceedances were found during water quality monitoring, the actions in accordance with the Event and Action Plan shall be carried out according to Appendix G. 2.8         Monitoring Results and Observations 2.8.1        During the reporting period, general water quality monitoring was conducted on 1, 4, 6 & 8 March 2019 at all eleven monitoring stations and regular DCM monitoring including monitoring stations S1, S2 & S3 were conducted on 11, 13, 15, 18, 20, 22, 25, 27 & 29 March 2019. Monitoring results of 7 key parameters: Salinity, DO, turbidity, SS, pH, temperature and total alkalinity for general water quality and regular DCM monitoring in this reporting month, are summarized in Table 2.11, and details results are presented in Appendix D. During the reporting period, initial intensive DCM water quality monitoring was conducted on 2, 4, 6, 8 & 10 March 2019 at all twelve monitoring stations consisting of UC1, UC2 and I1 to I10. Monitoring results of 7 key parameters: Salinity, DO, turbidity, SS, pH, temperature and total alkalinity for initial intensive DCM monitoring in this reporting month, are summarized in Table 2.12, and details results are presented in Appendix D.

 

Table 2.11        Summary of Impact Water Quality Monitoring Results

Locations		Parameters
		Salinity (ppt)	Dissolved Oxygen (mg/L)		pH	Turbidity (NTU)	Suspended Solids (mg/L)	Temp. (oC)	Total Alkalinity (mg/L)  note ii
			Surface & Middle	Bottom
B1	Avg.	30.60	10.56	10.54	8.93	2.5	5.23	20.8	110.3
	Min.	27.45	7.91	7.67	8.28	1.2	2.00	17.2	90.0
	Max.	33.60	13.04	13.01	9.51	4.5	12.00	23.9	113.0
B2	Avg.	30.61	10.40	10.40	8.89	2.3	5.28	20.8	110.7
	Min.	27.52	7.54	7.65	8.24	0.6	2.00	17.3	91.0
	Max.	33.28	12.77	12.85	9.51	4.8	10.00	23.9	113.0
B3	Avg.	30.76	10.24	10.27	8.94	2.3	5.41	20.7	110.8
	Min.	27.49	7.87	7.77	8.19	0.7	2.00	17.5	104.0
	Max.	33.37	12.32	12.35	9.46	4.9	12.00	23.9	113.0
B4	Avg.	30.55	10.57	10.52	8.91	2.5	5.17	20.7	111.0
	Min.	27.31	7.77	7.84	8.31	0.7	2.00	17.2	107.0
	Max.	33.40	12.99	12.89	9.50	4.8	12.00	23.9	114.0
C1	Avg.	30.53	10.33	10.36	8.91	2.4	5.50	20.8	110.9
	Min.	27.47	7.55	7.63	8.13	1.0	2.00	17.3	106.0
	Max.	33.35	12.90	12.50	9.56	4.9	11.00	23.9	114.0
C2	Avg.	30.56	10.35	10.35	8.92	2.5	5.55	20.7	110.9
	Min.	27.59	7.65	7.63	8.16	1.1	2.00	17.3	106.0
	Max.	33.14	13.03	13.06	9.43	4.7	11.00	23.9	114.0
CR1	Avg.	30.58	10.50	10.44	8.93	2.3	5.64	20.7	110.9
	Min.	27.73	7.58	7.74	8.14	0.4	2.00	17.3	106.0
	Max.	33.07	13.04	13.04	9.52	4.8	12.00	23.9	114.0
CR2	Avg.	30.50	10.15	10.15	8.91	2.5	5.92	20.7	110.8
	Min.	27.54	7.65	7.71	8.14	0.6	2.00	17.2	106.0
	Max.	33.42	12.33	12.30	9.51	4.9	11.00	23.9	114.0
F1	Avg.	30.67	10.43	10.45	8.93	2.3	5.88	20.7	111.0
	Min.	27.63	7.64	7.61	8.18	0.7	2.00	17.4	107.0
	Max.	33.34	13.00	13.05	9.57	5.0	12.00	23.9	114.0
H1	Avg.	30.57	10.23	10.23	8.92	2.3	5.48	20.7	110.9
	Min.	27.40	7.62	7.67	8.26	1.1	2.00	17.2	106.0
	Max.	33.43	13.01	12.80	9.50	4.9	12.00	23.9	114.0
M1	Avg.	30.38	10.45	10.42	8.91	2.2	6.32	20.7	110.5
	Min.	27.44	7.60	7.90	8.13	1.0	2.00	17.2	82.0
	Max.	32.72	13.25	12.99	9.53	4.9	11.00	23.9	114.0
S1	Avg.	30.56	10.97	10.94	8.23	3.1	4.63	21.6	111.9
	Min.	29.71	10.06	10.22	8.01	1.1	2.00	20.6	111.0
	Max.	31.79	11.96	11.65	8.46	4.0	10.00	22.7	113.0
S2	Avg.	30.51	11.38	11.35	8.87	2.5	5.72	21.2	110.9
	Min.	27.57	9.80	9.64	8.34	1.4	3.00	17.2	106.0
	Max.	33.23	13.13	13.05	9.55	3.5	11.00	23.9	114.0
S3	Avg.	30.61	11.40	11.40	8.87	2.3	6.20	21.2	111.0
	Min.	27.32	9.39	9.71	8.34	0.4	3.00	17.2	105.0
	Max.	33.36	13.25	13.18	9.42	3.8	11.00	23.9	114.0

Notes:  

        i.          "Avg", “Min” and “Max” is the average, minimum and maximum respectively of the data from measurements conducted under mid-flood and mid-ebb tides at three water depths, except that of DO where the data for “Surface & Middle” and “Bottom” are calculated separately.

       ii.          Total alkalinity test only conducted on DCM working day with referring master programme in Appendix A.

      iii.          Monitoring at S1, S2 and S3 shall only be conducted during DCM work period referring to master programme in Appendix A.

 

Table 2.11        Summary of Intensive DCM Water Quality Monitoring Results

Locations		Parameters
		Salinity (ppt)	Dissolved Oxygen (mg/L)		pH	Turbidity (NTU)	Suspended Solids (mg/L)	Temp. (oC)	Total Alkalinity (mg/L)  note ii
			Surface & Middle	Bottom
UC1	Avg.	30.82	8.53	8.50	9.01	2.8	4.68	18.9	111.7
	Min.	29.15	7.56	7.70	8.13	1.3	2.00	17.3	109.0
	Max.	32.86	9.26	9.17	9.38	4.1	9.00	20.2	114.0
UC2	Avg.	30.89	8.45	8.50	9.04	2.8	4.93	18.9	111.7
	Min.	29.15	7.58	7.67	8.19	1.3	2.00	17.3	109.0
	Max.	32.59	9.27	9.15	9.47	3.9	8.00	20.2	114.0
I1	Avg.	30.83	8.47	8.67	9.07	2.7	4.86	18.9	111.7
	Min.	29.16	7.56	7.79	8.22	1.3	3.00	17.4	109.0
	Max.	32.91	9.18	9.16	9.49	3.9	9.00	20.2	115.0
I2	Avg.	30.79	8.49	8.49	9.02	2.8	5.58	18.9	111.8
	Min.	29.16	7.64	7.57	8.28	1.7	2.00	17.2	109.0
	Max.	32.26	9.22	9.24	9.48	4.0	8.00	20.2	115.0
I3	Avg.	30.78	8.49	8.48	9.00	2.8	4.95	18.9	111.9
	Min.	29.22	7.65	7.57	8.18	1.0	2.00	17.3	109.0
	Max.	32.81	9.20	9.26	9.46	4.2	8.00	20.2	114.0
I4	Avg.	30.72	8.48	8.50	9.01	2.8	4.58	18.9	112.0
	Min.	29.07	7.57	7.96	8.20	1.8	2.00	17.2	109.0
	Max.	32.03	9.26	9.27	9.46	4.0	9.00	20.2	114.0
I5	Avg.	30.84	8.53	8.46	9.03	2.7	5.63	18.9	111.9
	Min.	29.24	7.84	7.59	8.17	1.0	2.00	17.3	108.0
	Max.	32.42	9.22	9.28	9.49	3.9	14.00	20.2	114.0
I6	Avg.	30.71	8.43	8.47	9.03	2.7	5.43	18.9	111.8
	Min.	29.09	7.55	7.74	8.20	1.2	3.00	17.2	109.0
	Max.	32.81	9.24	8.99	9.46	4.1	10.00	20.2	114.0
I7	Avg.	30.98	8.49	8.43	9.02	2.8	5.20	18.9	111.7
	Min.	29.10	7.58	7.73	8.13	1.5	2.00	17.5	109.0
	Max.	32.74	9.24	9.27	9.48	4.0	8.00	20.2	114.0
I8	Avg.	30.74	8.42	8.45	9.01	2.8	5.90	18.9	112.0
	Min.	29.07	7.59	7.76	8.23	0.9	2.00	17.3	109.0
	Max.	32.90	9.26	9.25	9.41	4.1	11.00	20.2	114.0
I9	Avg.	30.72	8.50	8.52	9.02	2.8	6.33	18.8	112.0
	Min.	29.11	7.71	7.77	8.18	1.5	2.00	17.3	109.0
	Max.	32.93	9.25	9.06	9.49	4.0	16.00	20.2	114.0
I10	Avg.	30.90	8.49	8.55	9.01	2.8	5.42	18.9	112.0
	Min.	29.13	7.65	7.79	8.13	1.1	2.00	17.2	108.0
	Max.	32.80	9.27	9.13	9.45	4.1	12.00	20.2	114.0

Notes:  

        i.          "Avg", “Min” and “Max” is the average, minimum and maximum respectively of the data from measurements conducted under mid-flood and mid-ebb tides at three water depths, except that of DO where the data for “Surface & Middle” and “Bottom” are calculated separately.

2.8.2        The weather conditions during the monitoring period were mainly sunny and cloudy. Sea conditions for the majority of monitoring days were mainly moderate. No major pollution source and extreme weather which might affect the results were observed during the impact monitoring. 2.8.3        During the impact monitoring period for March 2019, twenty-two and three of the General & Regular DCM water quality monitoring results for Suspended Solid (SS) obtained during the reporting period had exceeded the relevant Action or Limit Levels respectively; six and twenty-eight of the Initial Intensive DCM water quality monitoring results for Suspended Solid (SS) obtained during the reporting period had exceeded the relevant Action or Limit Levels respectively, where findings from investigations carried out immediately for each of the exceedance cases had showed that these exceedances were unrelated to the Project, however, environmental deficiencies of the Contractor on the implementation of the silt curtain deployment system were spotted. Details of the exceedance are presented in Section 8. 2.8.4        Implemented mitigation measures minimizing the adverse impacts on water are listed in the implementation schedule given in Appendix B.

 

3.    Noise Monitoring

3          

3.1         Monitoring Requirements 3.1.1        To ensure no adverse noise impact, noise monitoring is recommended to be carried out at the nearby noise sensitive receivers (NSRs) during construction phase. 3.1.2        In accordance with the Updated EM&A Manual, baseline noise level at the noise monitoring stations was 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. 3.1.3        In accordance with the Updated EM&A Manual, additional weekly impact monitoring should be carried out during respective restricted hours period (1900 – 0700) if the construction works were conducted at evening and night time. Additional weekly noise monitoring was conducted once per week in the form of 5-minutes measurements Leq, L10 and L90 levels recorded at each monitoring station between 1900 and 0700 as well as public holidays and Sundays. 3.2         Noise Monitoring Parameters, Time, Frequency 3.2.1        Impact noise monitoring was conducted weekly in the reporting period between 0700-1900 on normal weekdays. Additional impact noise monitoring was conducted weekly in the reporting period between 1900-0700 on all days as well as public holidays and Sundays. 3.2.2        Construction noise level 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 hours on normal weekdays. Leq 5mins was used as the monitoring parameter for the time period between 1900 and 0700 as well as public holidays and Sundays. Table 3.1 summarizes the monitoring parameters, frequency and duration of the impact noise monitoring and additional impact noise monitoring. The monitoring schedule is provided in Appendix C.

 Table 3.1 Noise Monitoring Parameters, Time, Frequency and Duration

Monitoring Station	Time	Duration	Parameters
M1/ N_S1, M2/ N_S2, M3/ N_S3	Day time: 0700-1900 hrs (during normal weekdays)	Once per week Leq 5min/Leq 30min (average of 6 consecutive Leq 5min)	Leq, L10 & L90
M1/ N_S1, M2/ N_S2, M3/ N_S3	Evening time: 1900-2300 hrs (including normal weekdays, also public holidays and Sundays)	Once per week Leq 5min (3 sets of Leq 5min)	Leq, L10 & L90
M1/ N_S1, M2/ N_S2, M3/ N_S3	Night time: 2300-0700 hrs (including normal weekdays, also public holidays and Sundays)	Once per week Leq 5min (3 sets of Leq 5min)	Leq, L10 & L90

3.3.2        M1, M2 and M3 are Shek Kwu Chau Treatment and Rehabilitation Centre Hostel 1, 2 and 3 respectively of The Society for the Aid and Rehabilitation of Drug Abusers (SARDA) located at southern part of Shek Kwu Chau. 3.3.3        Measurement at M1, M2 and M3 were conducted at a point 1m from the exterior of the sensitive receivers building façade and at a position 1.2m above the ground. The noise monitoring stations are summarized in Table 3.2 below.

Table 3.2 Noise Monitoring Location

Station	NSR ID in EIA Report	Noise Monitoring Location	Type of sensitive receiver(s)	Measurement Type
M1	N_S1	Shek Kwu Chau Treatment & Rehabilitation Centre Hostel 1	Residential	Façade
M2	N_S2	Shek Kwu Chau Treatment & Rehabilitation Centre Hostel 2	Residential	Façade
M3	N_S3	Shek Kwu Chau Treatment & Rehabilitation Centre Hostel 3	Residential	Façade

3.4         Impact Monitoring Methodology 3.4.1        At each designated monitoring location, measurements of six 5-minutes A-weighted equivalent sound pressure level [“Leq 5min”] was carried out between 0700 and 1900 for daytime measurements on a normal weekdays (exclude Sunday or general holiday). The measured six impact noise levels at each monitoring location shall then be averaged in logarithmic scale and expressed in terms of the 30 minutes A-weighted equivalent continuous sound pressure level (Leq 30min) for the time period between 0700 and 1900 hours on normal weekdays. 3.4.2        At each designated monitoring location, measurements of three 5-minutes A-weighted equivalent sound pressure level [“Leq 5min”] was carried out between 1900 and 0700 for evening time and night time measurements. 3.4.3        The monitoring procedures are as follows:

l   The microphone head of the lead level meter was normally positioned 1m exterior of the noise sensitive façade and lowered sufficiently so that the building’s external wall acts as a reflecting surface.

l   The battery condition was checked to ensure good functioning of the meter.

l   Parameters such as frequency weighting, the time weighting and the measurement time were set as follows:

-            Frequency weight: A

-            Time weighting: Fast

-            Measurement time: 5 minutes

l   Prior to and after noise measurement, the meter was calibrated using the calibrator for 94.0 dB at 1000Hz. If the difference in the calibration level before and after measurement is more than 1.0 dB, the measurement was considered invalid and repeat of noise measurement was required after re-calibration or repair of the equipment.

l   For Noise monitoring was carried out for 30 mins by sound level meter. At the end of the monitoring period, noise levels in terms of Leq, L10 and L90 were recorded. In addition, site conditions and noise sources were recorded when the equipment were checked and inspected.

l   All the monitoring data within the sound level meter system was downloaded through the computer software.

3.5         Monitoring Equipment 3.5.1        Integrated sound level meter was used for the noise monitoring.  The meter shall be in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications. 3.5.2        Equipment used in the impact noise monitoring programme is summarized in Table 3.3 below. Calibration certificates for the noise monitoring equipment are attached in Appendix H.

Table 3.3 Impact Noise Monitoring Equipment

Equipment	Brand and Model
Sound Level Meter	Nti XL2 SVAN 958A
Sound Level Meter Calibrator	Pulsar 105

3.6         Maintenance and Calibration 3.6.1        The maintenance and calibration procedures were as follows:

l   The microphone head of the sound level meter and calibrator were cleaned with a soft cloth at quarterly intervals.

l   The sound level meter and calibrator were checked and calibrated at yearly intervals

l   Immediately prior to and following each noise measurement the accuracy of the sound level meter shall be checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements may be accepted as valid only if the calibration levels from before and after the noise measurement agree to within 1.0dB.

3.7         Action and Limit Levels 3.7.1        The Action/Limit Levels 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 is presented in Table 3.4.

 

Table 3.4  Action and Limit Levels for Noise per Updated EM&A Manual

Notes: If works are to be carried out during restricted hours, the conditions stipulated in the Construction Noise Permit (CNP) issued by the Noise Control Authority have to be followed.

3.7.2        If exceedances were found during noise monitoring. The actions in accordance with the Event and Action Plan shall be carried out according to Appendix I. 3.8         Monitoring Results and Observations 3.8.1        Impact monitoring for noise impact for daytime was carried out on 4, 11, 18, 25 March 2019. Since the overnight monitoring was approved in late March 2019, only one additional monitoring event could be arranged on 29 March 2019. Additional impact monitoring for noise impact for evening time and night time was carried out on 29 & 30 March 2019. The impact noise levels and additional impact noise levels at Noise Monitoring Stations at SKC (i.e. M1/ N_S1 to M3/ N_S3) are summarized in Table 3.6, Table 3.7 and Table 3.8 respectively. Details of noise monitoring results are presented in Appendix J. 3.8.2        Major construction activity, major noise source and extreme weather which might affect the results were recorded during the impact monitoring. 3.8.3        According to our field observations, the major noise source identified at the designated noise monitoring station in the reporting month are summarised in Table 3.5:

Table 3.5 Summary of Field Observation

Monitoring Station	Major Noise Source
M1	Nil
M2	Nil
M3	Air-conditioning units nearby

Table 3.6  Summary of Impact Noise Monitoring Results during Daytime

Notes:

1.      A - Compliance with Limit Level of 0700 – 1900 on normal weekdays [75 dB(A)]

 

Table 3.7  Summary of Additional Impact Noise Monitoring Results during Evening Time

Notes:

1.      An unexpected failure happened for the sound level meter on monitoring station M2.

 

Table 3.8  Summary of Additional Impact Noise Monitoring Results during Night Time

Notes:

1.      An unexpected failure happened for the sound level meter on monitoring station M2.

3.8.4        Mitigation measures for construction works in restricted hours are implemented in accordance to the “Noise Reduction Measurement Report for Double Glazed Window of NSR in Shek Kwu Chau” of KSZHJV dated 19 December 2018 and approved by EPD. Double-glazed windows and air conditioning system were installed and confirmed operable for the NSRs (N_S1, N_S2 & N_S3).

3.8.5        During the noise monitoring event, frontline staffs of ET have inquired the treatment centre users on any noise disturbance from the construction activities at evening and night time, where no complaint and adverse opinions was received until now.

4.    Waste

4          

4.1         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. 4.2         As advised by the Contractor, 0 m3 of C&D material was generated on site in the reporting month. For C&D waste, no metals were generated and collected by registered recycling collector. 256 kg of paper was generated on site and collected by registered recycling collector. No plastic waste was collected by registered recycling collector. No chemical waste was collected by the licensed chemical waste collector. 0 m3 of other types of wastes (e.g. general refuse) were generated on site and disposed of at Landfill. 97,100 m3 of sand and 755.2 m3 of rock were imported during the reporting period. 4.3         524.534 m3 of dredged sediment in bulk quantity was dumped according to its dumping permit (EP/MD/19-094) during the reporting period. 4.4         Chemical waste generated from the cleaning of oil stain and leakage on deck of barges was now stored in the chemical waste storage area on the barges. 4.5         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 summarised in Table 4.1. Details of cumulative waste management data are presented as a waste flow table in Appendix K.

Table 4.1 Quantities of Waste Generated from the Project

Notes:

1.      Broken concrete for recycling into aggregates.

2.      Plastic refer to plastic bottles / containers, plastic sheets / foam from packaging materials.

3.      Use the conversion factor: 1 full load of dumping truck being equivalent to 6.5m3 by volume.

 

4.6         Although there is not much waste generation anticipated in the coming month from the Project, the Contractor is advised to sort and store any solid and liquid waste on-site properly prior to disposal.

5.    Coral

5          

5.1         Coral Monitoring Requirements 5.1.1        To monitor the health condition of corals during different phases, corals located within areas likely to be affected by the Project, corals located at control sites (areas unlikely to be affected by the Project), the trans-located coral colonies as well as the tagged natural coral colonies at the recipient site were chosen, in order to identify any adverse indirect impact from the marine works. The size, percentage cover and health condition of corals (i.e. any sign of abnormal appearance, such as layer of mucus, bleaching, partial mortality etc.) at representative transects should be recorded during each monitoring. 5.2         Coral Monitoring Parameters, Time, Frequency 5.2.1        Rapid Ecological Assessment (REA) survey was conducted on 26 June 2018 at the suggested control site and indirect impact site within two week before commencement of the construction work which was 29 June 2018. 10 selected hard coral colonies with the similar species were tagged at both control and indirect impact site. Following coral translocation in the recipient site R3, 16 coral colonies attached to rocks less than 50 cm in diameter were translocated and tagged, as well as 10 selected natural coral colonies, at the recipient site. One additional REA survey was conducted in December 2018 to further assess the seabed condition at Indirect Impact Site after Typhoon Mangkhut. 5.2.2        Tagged coral colonies at the suggested control site and indirect impact site are being monitored weekly for the first month and followed by monthly monitoring for two months. Quarterly monitoring will be carried out after the first three-months monthly monitoring for until the end of the construction phase. The selected Control Site is located at Yuen Kong Chau of Soko Islands about 7 km away from the project area. Tagged coral colonies at the proposed recipient site are being monitored quarterly for one year. The selected recipient site R3 is located the opposite side of the Project area at about 2 km away. The detailed survey of the Control Site and Impact Site were conducted before the commencement of the Construction Phase. 5.2.3        Monitoring recorded the following parameters (using the same methodology adopted during the pre-translocation survey); the size, presence, health conditions (percentage of mortality/bleaching) and percentage of sediment of each tagged coral colony. The general environmental conditions including weather, sea, and tidal conditions of impact site, control site and recipient site were monitored. 5.2.4        Table 5.1 summarizes the monitoring locations, time and frequency of the tagged coral colonies monitoring. The monitoring schedule is provided in Appendix C.

 Table 5.1 Tagged Coral Monitoring Locations, Time and Frequency

Monitoring Location	Monitoring Month/Year	Frequency	No. of Monitoring Survey
10 selected hard coral colonies at control site / indirect impact site	1st Month	Weekly Survey	4
	2nd to 3th Months	Monthly Survey	2
	4th Month (postponed to 5th month due to diver accident in Shek Kwu Chau in October 2018)	Re-tagging of Coral Colonies in Indirect Impact Site after Typhoon Mangkhut
	4th Month (postponed to 5th month due to diver accident in Shek Kwu Chau in October 2018 and further postpone to 6th month due to adverse weather)	Re-tagging of Coral Colonies in Control Site after Typhoon Mangkhut
	5th Month (postponed to 6th month due to diver accident in Shek Kwu Chau and further postponed to 7th month due to delay of re-tagging activities at both Indirect Impact Site and Control Site)	Post Re-tagging Monthly Survey	1
	7th to 76th Months (postponed to 8th to 76th month due to diver accident in Shek Kwu Chau in October 2018)	Quarterly Survey	23
16 translocated hard coral colonies and 10 selected natural hard coral colonies at recipient site R3	1st Year	Quarterly Survey	4

5.3         Coral Monitoring Locations 5.3.1        Location of the ten tagged coral colonies at each of the proposed indirect impact site (re-tagging after typhoon Mangkhut), control site (baseline) and recipient site R3 (translocation) are shown in Figure 5.1, Figure 5.2 and Figure 5.3 respectively:

 

Figure 5.1 Tagged Natural Corals at Indirect Impact Site Near SKC for re-tagging after typhoon Mangkhut

Figure 5.2 Tagged Natural Corals at Control Site Near Yuen Kong Chau for re-tagging after typhoon Mangkhut

Figure 5.3 Tagged Translocation Corals at Recipient Site R3 near SKC

5.3.2        The GPS coordinates of the tagged coral colonies, retagged coral colonies and recipient site were shown in Table 5.2, Table 5.3 and Table 5.4 respectively.

Table 5.2 Tagged Natural Corals during Baseline and Re-tagged Natural Corals after Typhoon Manghkut at Control Site near Yuen Long Chau

Coral #	GPS Coordinates
1	N22°09’45.96”	E113°54’57.81”
2R	N22°11’29.12”	E113°59’09.01”
3	N22°09’45.81”	E113°54’57.78”
4	N22°09’45.70”	E113°54’57.95”
5R	N22°11’29.10”	E113°59’09.18”
6	N22°09’45.75”	E113°54’58.02”
7R	N22°11’29.17”	E113°59’08.86”
7	N22°09’45.65”	E113°54’57.94”
8	N22°09’45.53”	E113°54’57.90”
9	N22°09’46.23”	E113°54’54.70”
10R	N22°11’29.18”	E113°59’08.91”

Notes:

i.              The re-tagged corals were marked as ##R.

Table 5.3  Re-tagged Natural Corals after Typhoon Manghkut at Indirect Impact Site near SKC

Coral # note i	GPS Coordinates
11R	N22°11’29.14”	E113°59’08.92”
12R	N22°11’29.12”	E113°59’09.01”
13R	N22°11’29.11”	E113°59’09.07”
14R	N22°11’29.13”	E113°59’09.12”
15R	N22°11’29.10”	E113°59’09.18”
16R	N22°11’29.07”	E113°59’09.23”
17R	N22°11’29.17”	E113°59’08.86”
18R	N22°11’29.14”	E113°59’08.94”
19R	N22°11’29.20”	E113°59’08.81”
20R	N22°11’29.18”	E113°59’08.91”

Notes:

i.              The re-tagged corals were marked as ##R.

 

Table 5.4  GPS Coordinates of Recipient Site R3

Site	GPS Coordinates
R3	N22°11’43.69”	E113°28.99”

 

5.4         Impact Monitoring Methodology 5.4.1        Health status of coral was assessed by the following criteria:

·          Hard coral: Percentage of surface area exhibiting partial mortality and blanched/bleached area of each coral colony and degree of sedimentation.

5.5         Action and Limit Levels 5.5.1        Monitoring result was reviewed and compared against the below Action Level and Limit Level (AL/LL) as set with the below Table 5.5 and Table 5.6.

 

Table 5.5  Action and Limit Levels for Construction Phase Coral Monitoring

Parameter	Action Level	Limit Level
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.

 

Table 5.6  Action and Limit Levels for Post-Translocation Coral Monitoring

Parameter	Action Level	Limit Level
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 is not recorded on the original corals in the recipient site, then the Action Level is exceeded.	If during Post-Translocation Monitoring a 25% increase in the percentage of partial mortality on the corals occurs at more than 20% of the translocated coral colonies that is not recorded on the original corals in the recipient site, then the Limit Level is exceeded.

5.5.2        If exceedance was found during coral monitoring. The actions in accordance with the Event and Action Plan should be carried out according to Appendix L. 5.6         Monitoring Results and Observations 5.6.1        The 1st quarterly coral monitoring during construction phase at both Indirect Impact Site and Control Site was conducted on 28 March 2019 and the weather condition was summarized in Table 5.7.

 

Table 5.7  Weather Condition for the 1st Quarterly Coral Monitoring during Construction Phase at both Indirect Impact Site and Control Site

Date	Condition	Average Underwater Visibility
28 March 2019	-        Northeast force 3 -        Sunny period	Less than 0.5m

5.6.2        Ten (10) hard coral colonies were monitored at each Control site and Indirect Impact Site as suggested in the Construction Phase Monitoring Plan. The general health conditions (size, mortality, bleaching and sediment) were recorded and summarized in Table 5.8 and Table 5.9. Photos of each coral colonies were taken during the monitoring activities shown in Photo Plate 5.1 and 5.2.

Table 5.8  Sizes, Condition, Mortality, Bleaching and Sediment of 10 Natural Coral Colonies at Control Site during 1st Quarterly Coral Monitoring

Tag #	Species	Size (cm) – Max. Diameter	Condition	Mortality (%)		Bleaching (%)		Sediment (%)
				Baseline	28/03	Baseline	28/03	Baseline	28/03
1	Goniopora stutchburyi	25	Fair	0	0	0	0	0	0
2R	Goniopora stutchburyi	10	Good	0	0	0	0	0	0
3	Psammocora superficialis	18	Fair	0	0	0	0	0	0
4	Turbinaria peltata	13	Good	0	0	0	0	0	0
5R	Goniopora stutchburyi	18	Good	0	0	0	0	0	0
6	Cyphastrea serailia	43	Fair	0	0	0	0	0	0
7R	Coscinaraea sp.	15	Good	0	0	0	0	0	0
8	Goniopora stutchburyi	21	Good	0	0	0	0	0	0
9	Goniopora stutchburyi	11	Fair	0	0	0	0	0	0
10R	Goniopora stutchburyi	20	Good	0	0	0	0	0	0

Notes:

i.              The re-tagged corals were marked as ##R.

 

 

Table 5.9  Sizes, Condition, Mortality, Bleaching and Sediment of 10 Natural Coral Colonies at Indirect Impact Site during 1st Quarterly Coral Monitoring

Tag #	Species	Size (cm) – Max. Diameter	Condition	Mortality (%)		Bleaching (%)		Sediment (%)
				Baseline	28/03	Baseline	28/03	Baseline	28/03
11R	Cyphastrea serailia	48	Good	0	0	0	0	0	0
12R	Favites chinensis	27	Good	0	0	0	0	0	0
13R	Turbinaria peltata	21	Good	0	0	0	0	0	0
14R	Favites chinensis	8	Good	0	0	0	0	0	0
15R	Goniopora stutchburyi	11	Good	0	0	0	0	0	0
16R	Psammocora superficialis	27	Good	0	0	0	0	0	0
17R	Favites chinensis	15	Good	0	0	0	0	0	0
18R	Psammocora superficialis	39	Good	0	0	0	0	0	0
19R	Psammocora superficialis	42	Good	0	0	0	0	0	0
20R	Psammocora superficialis	29	Good	0	0	0	0	0	0

Notes:

i.              The re-tagged corals were marked as ##R.

5.6.3        The 4th Post-Translocation Monitoring was conducted on 28 March 2019 for the Recipient Site R3 (Figure 5.3) and the weather conditions were summarized in Table 5.10. Seven (7) translocated and nine (9) natural hard coral colonies were remained to monitor after the typhoon Mangkhut in mid-September 2018. The general health conditions (size, condition, mortality, bleaching and sediment) at Recipient Site were recorded and summarized in Table 5.11 and Table 5.12 respectively. Photos of each tagged corals colonies were taken and shown in Photo Plates 5.3 and 5.4.

Table 5.10        Weather Condition for the 4th Post-Translocated Monitoring at Recipient Site R3

Date	Condition	Average Underwater Visibility
28 March 2019	-        Northeast force 3 -        Sunny period	Less than 0.5m

 

 

Table 5.11        Sizes, Condition, Mortality, Bleaching and Sediment of 7 Translocated Coral Colonies at Recipient Site for 4th Post-Translocation Coral Monitoring

Coral #	Species	Size (cm) – Max. Diameter/ Height	Mortality (%)		Bleaching (%)		Sediment (%)
			Baseline	28/03	Baseline	28/03	Baseline	28/03
1	Psammocora superficialis	35	0	15**	0	0	0	0
2	Psammocora superficialis	N/A	35	N/A	0	N/A	0	N/A
3	Psammocora superficialis	N/A	0	N/A	0	N/A	0	N/A
4	Turbinaria peltata	9	0	10**	0	0	0	0
5	Goniopora stutchburyi	N/A	0	N/A	0	N/A	0	N/A
6	Psammocora superficialis	26	0	15**	0	0	0	0
7	Psammocora superficialis	23	0	5**	0	0	5	0
8	Psammocora superficialis	N/A	0	N/A	0	N/A	0	N/A
9	Goniopora stutchburyi	N/A	0	N/A	0	N/A	0	N/A
10	Coscinaraea n sp.	21	0	5**	0	0	1	0
11	Psammocora superficialis	13	0	0	0	0	0	0
12	Psammocora superficialis	N/A	0	N/A	0	N/A	0	N/A
13	Psammocora superficialis	N/A	0	N/A	0	N/A	0	N/A
14	Psammocora superficialis	N/A	0	N/A	0	NA	0	N/A
15	Goniopora stutchburyi	N/A	0	N/A	0	N/A	0	N/A
16	Psammocora superficialis	26	0	10**	0	N/A	0	0

*      N/A: Non Applicable as coral colonies were missing.

**    Increased mortality was found after the hitting of super typhoon Mangkhut in Mid-September 2018.

 

 

Table 5.12        Sizes, Condition, Mortality, Bleaching and Sediment of 9 Natural Coral Colonies at Recipient Site for 4th Post-Translocation Coral Monitoring

Coral #	Species	Size (cm) – Max. Diameter/ Height	Mortality (%)		Bleaching (%)		Sediment (%)
			Baseline	28/03	Baseline	28/03	Baseline	28/03
1	Coscinaraea n sp.	16	0	0	0	0	0	0
2	Psammocora superficialis	24	0	0	0	0	0	0
3	Psammocora superficialis	23	0	0	0	0	0	0
4	Coscinaraea n sp.	15	0	0	0	0	0	0
5	Cyphastrea serailia	42	0	0	0	0	0	0
6	Cyphastrea serailia	12	0	0	0	0	0	0
7	Cyphastrea serailia	46	0	0	0	0	0	0
8	Psammocora superficialis	21	0	0	0	0	0	0
9	Psammocora superficialis	19	0	0	0	0	0	0
10	Goniopora stutchburyi	N/A	0	N/A	0	N/A	0	N/A

*N/A: Non Applicable as coral colonies were missing.

Photo Plate 5.1        Ten (10) Monitored Corals at Control Site

Tag #	28 March 2019
#1
#2R
#3
#4
#5R
#6
#7R
#8
#9
#10R

Notes:

i.              The re-tagged corals were marked as ##R.

 

Photo Plate 5.2        Ten (10) Monitored Corals at Indirect Impact Site

Tag #	28 March 2019
#11R
#12R
#13R
#14R
#15R
#16R
#17R
#18R
#19R
#20R

Notes:

i.              The re-tagged corals were marked as ##R.

 

 

Photo Plate 5.3        Seven (7) Translocated Corals at Recipient Site R3

Coral #01	Coral #04
Coral #06	Coral #07
Coral #10	Coral #11
Coral #16

 

 

 

 

Photo Plate 5.4        Nine (9) Nautral Control Corals at Recipient Site R3

Coral #01	Coral #02
Coral #03	Coral #04
Coral #05	Coral #06
Coral #07	Coral #08
Coral #09

 

 

5.6.4        After the hitting of super typhoon Mangkhut, the coral re-tagging activities were carried out in the control site and indirect impact area on 23 November and 3 December 2018. Four and ten hard coral colonies were successfully re-tagged at both control and indirect impact sites respectively. 5.6.5        The 1st quarterly coral monitoring during construction phase at both Indirect Impact Site and Control Site was carried out on 28 March 2019. A total of 20 tagged coral colonies (10 at control site and 10 and indirect impact site including the re-tagged coral colonies) were monitored.  Similar to the baseline result, the health condition of all tagged coral colonies were good in general.  No increased mortality was recorded during the survey. 5.6.6        No sediment, bleaching or increased mortality in the general condition of coral colonies were observed during the first construction phase monitoring period.  No deterioration of the coral community was observed in the ecological monitoring results when compared with the baseline ecological monitoring results. There is no AL/LL exceedance during the monitoring period.  Photos of each tagged corals colonies were taken and shown in Photo Plates 5.1 and 5.2. 5.6.7        The first post-translocation coral monitoring was carried out on 26 June 2018. Sixteen (16) movable hard coral colonies were monitored at the recipient site R3. However, 9 translocated coral colonies were missing during the 2nd Post-Translocation Coral Monitoring survey and only 7 left.  The remaining seven translocated coral colonies also showed an increased mortality from 5% to 15%. The missing colonies probably were swept away by the strong wave action caused by the Super Typhoon Mangkhut hitting Hong Kong on mid-September 2018. 5.6.8        The 4th post-translocation coral monitoring was carried out on 28 March 2019. Seven (7) remaining hard coral colonies were monitored at the recipient site R3. The general health of the remaining coral colonies were good in general and no increased mortality was recorded during the 4th post-translocation coral monitoring survey. 5.6.9        Remaining nine (9) natural hard coral colonies were also monitoring at the recipient site as control and similar to the baseline result, all the natural coral colonies are all in good condition. No increased mortality was recorded during the survey. 5.6.10     No sediment, bleaching or increased mortality in the general condition of coral colonies were observed during the monitoring period. No deterioration of the coral community was observed in the ecological monitoring results when compared with the baseline ecological monitoring results. There is no AL/LL exceedance during the monitoring period.  Photos of each tagged translocated and natural corals were taken and shown in Photo Plates 5.3 and 5.4.