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Document control
Report title		5th Monthly Environmental Monitoring and Audit (EM&A) Report (March 2025)
Document code		EM&A-05	Project number		P526864
File path
Client
Client contact			Client reference
Rev	Date	Revision details/status	Author	Reviewer	Verifier (if required)	Approver
1	07/04/2025	First Issue	Kitty Wang	Ray Yan		F. C. Tsang
2	11/04/2025	Second Issue	Kitty Wang	Ray Yan		F. C. Tsang
3	14/04/2025	Third Issue	Kitty Wang	Ray Yan		F. C. Tsang
Current revision		3

 

 

Approval
Author signature		Certified by
Name	Kitty Wang	Name	F. C. Tsang
Title	Environmental Team Consultant	Title	Environmental Team Leader

 

Contents

Executive Summary. V

1    Introduction. 1

1.1     Project Background. 1

1.2     Project Organisation. 1

1.3     Construction Works Programme and Construction Works Area. 2

1.4     Summary of Environmental Status. 3

2    Air Quality Monitoring.. 5

2.1     Monitoring Requirement. 5

2.2     Monitoring Location. 5

2.3     Monitoring Parameter and Frequency and Duration. 6

2.4     Monitoring Equipment. 6

2.5     Monitoring Methodology. 7

2.6     Maintenance/Calibration. 7

2.7     Action and Limit Level for Air Quality Monitoring.. 8

2.8     Results and Observations. 8

2.9     Event and Action Plan. 9

3    Construction Noise Monitoring.. 10

3.1     Monitoring Requirements. 10

3.2     Monitoring Locations. 10

3.3     Noise Monitoring Parameter, Frequency and Duration. 11

3.4     Monitoring Equipment, Methodology and QA / QC Procedure. 11

3.5     Maintenance and Calibration. 12

3.6     Action and Limit Levels. 12

3.7     Results and Observations. 13

3.8     Event and Action Plan. 14

4    Water Quality. 15

4.1     Monitoring Requirement. 15

4.2     Monitoring Location. 15

4.3     Monitoring Parameter and Frequency. 16

4.4     Sampling Depths & Replication. 16

4.5     Monitoring Equipment. 16

4.6     Monitoring Methodology. 19

4.7     QA/QC Requirements. 20

4.8     Action and Limit Level for Water Quality Monitoring.. 20

4.9     Results and Observations. 22

4.10      Event and Action Plan. 23

5    Waste Management. 24

6    Ecology. 25

6.1     Monitoring and Audit Requirements. 25

6.2     Results and Observations. 26

7    Landscape and Visual. 29

7.1     Audit Requirements. 29

7.2     Results and Observations. 29

7.3     Event and Action Plan. 29

8    Environmental Site Inspection and Audit. 30

8.1     Implementation Status of Environmental Mitigation Measures. 30

9    Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions. 32

9.1     Summary of Exceedance. 32

9.2     Summary of Environmental Non-Compliance. 32

9.3     Summary of Environmental Complaint. 32

9.4     Summary of Environmental Summon and Successful Prosecution. 32

10     Future Key Issues. 33

10.1      Works and Potential Environmental Issues in the next Reporting Period. 33

10.2      Recommendation. 34

11     Conclusions. 36

11.1      Conclusion. 36

11.2      Comments/ Recommendations. 37

 

Appendices

Appendix 1.1    Construction Programme

Appendix 1.2    Project Organization Chart

Appendix 1.3    Implementation Status of Environmental Mitigation Measure

Appendix 1.4    Impact Monitoring Schedule of the Reporting Month

Appendix 2.1    Calibration Certificates of Impact Air Quality Monitoring Equipment

Appendix 2.2    Impact Air Quality Monitoring Data

Appendix 2.3    Weather Information during the Reporting Period

Appendix 2.4    Event and Action Plan for Air Quality

Appendix 3.1    Calibration Certificates of Impact Noise Monitoring Equipment

Appendix 3.2    Impact Noise Monitoring Data

Appendix 3.3    Event and Action Plan for Noise

Appendix 4.1    Calibration Certificates of Impact Water Quality Monitoring Equipment

Appendix 4.2    Impact Water Quality Monitoring Data

Appendix 4.3    Quality Control Report for Suspended Solids

Appendix 4.4    Event and Action Plan for Water Quality

Appendix 5.1    Summary of Monthly Waste Flow Table

Appendix 7.1    Event and Action Plan for Landscape and Visual

Appendix 9.1    Complaint Log

Appendix 10.1  Impact Monitoring Schedule of Next Reporting Month

Figures

Figure 1.1      General Site Location Plan

Figure 1.2      Annotated Site Drawing Presenting the Construction Activities Conducted at Contract 1 in the Reporting Period

Figure 1.3      Annotated Site Drawing Presenting the Construction Activities Conducted at Contract 2 in the Reporting Period

Figure 2.1      Impact Air Quality Monitoring Locations

Figure 3.1      Impact Noise Monitoring Locations

Figure 4.1      Impact Water Quality Monitoring Locations

Figure 6.1      HSK Egretry and the 100m extent from the HSK Egretry associated with the footprint of Contract 2

Figure 6.2      HSK Egretry and the 100m extent from the HSK Egretry associated with the footprint of Contract 3

Tables

Table A1      Summary of EM&A activities in the Reporting Period

Table A2      Summary of Exceedances in the Reporting Period

Table 1.1     Parties Involved in Project Organisation

Table 1.2     Status of Environmental License, Notifications and Permits for Contract 1

Table 1.3     Status of Environmental License, Notifications and Permits for Contract 2

Table 2.1     Summary of Impact Air Quality Monitoring Stations in related to the works contracts in the reporting period

Table 2.2     Parameters measured in the Impact Air Quality Monitoring

Table 2.3     Water Quality Monitoring Equipment

Table 2.4     Air Quality Monitoring Equipment

Table 2.5     Action and Limit Levels for Air Quality Monitoring

Table 2.6     Summary of Air Quality Monitoring Results in related to the works contracts in the reporting period

Table 3.1     Construction Noise Monitoring Stations near in related to the works contracts in the reporting period

Table 3.2     Construction Noise Monitoring Parameter, Frequency and Duration

Table 3.3     Construction Noise Monitoring Equipment

Table 3.4     Action and Limit Levels for Construction Noise Monitoring

Table 3.5     Summary of Construction Noise Monitoring Results in related to the works contracts in the reporting period

Table 4.1     Summary of Impact Water Quality Monitoring Stations in related to the works contracts in the reporting period

Table 4.2     Parameters measured in the Impact Water Quality Monitoring

Table 4.3     Water Quality Monitoring Equipment

Table 4.4     Method for Laboratory Analysis for Water Samples

Table 4.5     Action and Limit Levels for Water Quality

Table 4.6     Action and Limit Levels of Water Quality

Table 4.7     Summary of Exceedance Records of Water Quality Monitoring in related to the works contracts in the reporting period

Table 4.8     Summary of Exceedance Records of Water Quality Monitoring in related to the works contracts in the reporting period

Table 5.1     Summary of Waste Generated by the Construction Works in related to the Works Contracts in the Reporting Period

Table 6.1     Schedule for Bat Roost Survey at Contract 2 during the Reporting Period

Table 6.2     Upcoming Schedule for Bat Roost Survey at Contract 2 in the Next Reporting Period

Table 8.1     Site Observations at Contract 1 during the reporting period

Table 8.2     Site Observations at Contract 2 during the reporting period

 

Executive Summary

A1.     This is the 5th Monthly Environment Monitoring and Audit (EM&A) Report for Hung Shui Kiu/Ha Tsuen New Development Area Second Phase Development (the Project). This report was prepared by Aurecon Hong Kong Limited (Aurecon) under Service Contract No. WD/03/2023 Hung Shui Kiu/Ha Tsuen New Development Area Second Phase Development - Environmental Team (hereinafter called the “Service Contract”). This report documents the findings of EM&A works at Contract No. YL/2023/01 (hereinafter called the “Contract 1”) and Contract No. YL/2023/02 (hereinafter called the “Contract 2”) under the Project during the reporting period from 1 to 31 March 2025.

A2.     The construction phase EM&A programme started on 1 November 2024.

Key Construction Works in the Reporting Period

A3.     A summary of construction activities undertaken during the reporting period is presented below:

Contract 1

·        Underground Utility Detection;

·        Ground Investigation Works;

·        Watermains Laying Works;

·        Construction of CLC Footing;

·        Realign of Bar Fencing

·        Excavation Works at Part T.

 

Contract 2

·        Tree Felling;

·        Ground Investigation;

·        Earthworks;

·        Piezometer / Standpipe Installation;

·        Site Clearance and Tree Felling at part E;

·        Preparation of TTA for pipe laying.

Environmental Monitoring and Audit Programme

A4.     The monthly EM&A programme was undertaken by the ET in accordance with the Updated EM&A Manual (Apr 2022). A summary of the monitoring and audit activities during the reporting period is presented in Table A1.

Table A1 Summary of EM&A activities in the Reporting Period

EM&A Activities	Date
Air Quality Monitoring	1, 4, 6, 10, 12, 15, 18, 21, 24, 27 and 29 March 2025
Noise Monitoring	5, 11, 20 and 26 March 2025
Water Quality Monitoring	3, 5, 7, 10, 12, 14, 17, 19, 21, 24, 26, 28 and 31 March 2025
Ecological Monitoring (Egretry Monitoring)	11 March 2025
Ecological Monitoring (Bat Roost Survey (Contract 2))	7, 12 and 20 March 2025
Weekly Environmental Site Inspection (Contract 1)	7, 14, 21 and 26 March 2025
Weekly Environmental Site Inspection (Contract 2)	7, 14, 21 and 28 March 2025

Breaches of Action and Limit Levels

A5.     Summary of the environmental exceedances of the reporting period is tabulated in Table A2.

Table A2 Summary of Exceedances in the Reporting Period

Environmental Monitoring	Parameter	No. of Exceedances		Total No. of Exceedances	No. of Non-project Related Exceedances			Total No. of Non-project Related Exceedances	No. of Exceedances Related to the Project		Total No. of Exceedances Related to the Project
		AL	LL		AL		LL		AL	LL
Air Quality	1-hour TSP	0	0	0		0	0	0	0	0	0
Noise	Leq(30mins)	0	0	0		0	0	0	0	0	0
Water Quality	DO	0	0	0		0	0	0	0	0	0
	Turbidity	0	0	0		0	0	0	0	0	0
	SS	1	0	1		1	0	1	0	0	0
	pH	0	0	0		0	0	0	0	0	0

 

Air Quality

A6.     All air quality monitoring was conducted as scheduled in the reporting period. No Action Level or Limit Level exceedance was recorded for air quality monitoring in the reporting period.

Noise

A7.     All construction noise monitoring was conducted as scheduled in the reporting period. No Action Level or Limit Level exceedance was recorded for construction noise monitoring in the reporting period.

Water Quality

A8.     Water quality monitoring could not be conducted at the planned monitoring time on 3 March 2025 and 5 March 2025 at D6a as the station was observed dried out with algae left behind. Water quality monitoring could not be conducted at the planned monitoring time on 12 March 2025 at D5a due to the limit of access to D5a from the main gate of the warehouse by the premises owner of the warehouse.

A9.     During the reporting period, 1 action level of exceedance for SS was recorded. After the investigation, the exceedance is considered as non-project related.

Ecological

A10.  All ecological monitoring was conducted as scheduled in the reporting period. No findings observed during the bat roost survey at Contract 2. A total of 2 Little Egret nests were recorded at trees on both side of the drainage channel during the egretry monitoring.

Complaint Log

A11.  No environmental complaint was received in the reporting period.

Notification of Summons and Successful Prosecutions

A12.  No notification of summons or successful prosecutions was received in the reporting period.

Reporting Changes

A13.  Water quality monitoring could not be conducted at the planned monitoring time on 12 March 2025 at D5a due to the limit of access to D5a from the main gate of the warehouse by the premises owner of the warehouse. Hence, an alternative location (i.e. D5b) was identified for temporary location to carry out sampling and measurement since 14 March 2025. The Proposal of Alternative Monitoring Location (WQM Station at D5a) was approved by EPD on 8 April 2025.

A14.  Egretry monitoring would be monitored monthly during the ardeid breeding season (i.e. March to August) by qualified ecologists with at least 10 years of relevant local experience at the HSK egretry instead of the San Sang San Tsuen egretry since March 2025.

Future Key Issues

A15.  The major site activities for the next reporting period are summarized below:

 

Contract 1

·        Underground Utility Detection;

·        Ground Investigation Works;

·        Watermains Laying Works;

·        Construction of CLC Footing;

·        Removal of Bar Fencing

·        Excavation Works at Part T.

·        Tree Felling Works;

·        Demolition of Existing Height Restriction Gantry and Footing at Part T;

·        Construction of Pole Mount Transformer;

·        Construction of CLC Superstructure;

·        Construction of PM’s Office Footing and Superstructure;

·        Demolition of Warehouses;

·        CLC Sewerage Connection Works at Kiu Cheong Road.

 

Contract 2

·        Tree Felling;

·        Ground Investigation Works;

·        Earthworks;

·        Piezometer / Standpipe Installation;

·        Site Clearance and Tree Felling at part E;

·        Site Office Setup;

·        Pipe laying.

1              Introduction 1.1        Project Background

1.1.1        The development area of HSK/HT NDA is about 441 hectares (ha), and is located at the north-western part of the New Territories, midway between the Tuen Mun and Tin Shui Wai New Towns. The HSK/HT NDA will provide associated engineering infrastructure and supply land for subsequent development of public and private housing, community facilities, commercial and industrial premises, the Green Transit Corridor (comprising the Smart and Green Mass Transit System , footpaths and cycle tracks) and other uses, and for construction of the proposed infrastructure works such as district distributor roads, local roads, revitalisation of existing channels, sewerage (including pumping stations), drainage (including pumping stations), water supply, landscaping, electrical and mechanical (E&M), and associated works.

1.1.2        HSK/HT NDA is being implemented in three phases, viz. First Phase development, Second Phase development and Remaining Phase development. The Civil Engineering and Development Department (CEDD) commences construction works for the Second Phase development of HSK/HT NDA progressively from 2024.

 

1.1.3        Aurecon was commissioned by CEDD to provide EM&A services for the works contracts in relation to the Project pursuant to the requirements as specified in relevant EP, the Updated EM&A Manual (Apr 2022) and the approved EIA Report for the Project to discharge the duties of the ET for the Project, including the baseline monitoring works for various monitoring parameters (e.g. AQM, CNM, WQM, etc.).

 

1.1.4        This is the 5th Monthly EM&A Report summarizing the key findings of the construction phase EM&A programme at Contract 1 and Contract 2 from 1 to 31 March 2025 (the reporting period) and is submitted to fulfil the requirements in Condition 3.3 of the EPs (i.e. EP-531/2017, EP-530/2017, EP-529/2017, EP-528/2017 & EP-527/2017) and Section 15.3 of the Updated EM&A Manual (Apr 2022) of the Project.

1.2        Project Organisation 1.2.1        Parties with different levels of involvement in the Project organisation are summarized in Table 1.1.

Table 1.1 Parties Involved in Project Organisation

Parties	Organization / Company
Project Proponent	Civil Engineering and Development Department (CEDD)
Supervisor / Engineer’s Representative (ER)	Ove Arup & Partners Hong Kong Limited
Contractor	Contract No. YL/2023/01 (Contract 1)	Sang Hing – Kuly Joint Venture (SKJV)
	Contract No. YL/2023/02 (Contract 2)	Chun Wo - Build king - Yee Hop Joint Venture (CWBKYH JV)
Environmental Team (ET)	Aurecon Hong Kong Limited
Independent Environmental Checker (IEC)	Mott MacDonald Hong Kong Limited

1.2.2        The key personnel contact names and numbers are summarized in Appendix 1.2. 1.3        Construction Works Programme and Construction Works Area 1.3.1        The construction phase EM&A programme commenced on 1 November 2024. The construction works programme, and the construction works area of the Project are shown in Appendix 1.1 and Figure 1.1 respectively. A summary of construction activities undertaken at Contract 1 and Contract 2 during this reporting period is presented below, and in Figure 1.2 and Figure 1.3 respectively:

Contract 1

·        Underground Utility Detection;

·        Ground Investigation Works;

·        Watermains Laying Works;

·        Construction of CLC Footing;

·        Realign of Bar Fencing

·        Excavation Works at Part T.

 

Contract 2

·        Tree Felling;

·        Ground Investigation;

·        Earthworks;

·        Piezometer / Standpipe Installation;

·        Site Clearance and Tree Felling at part E;

·        Preparation of TTA for pipe laying.

1.4        Summary of Environmental Status 1.4.1        A summary of the relevant permits, licences, and/or notifications on environmental protection for the work contracts that are involved in this reporting period is presented in Table 1.2 and Table 1.3 respectively.

Table 1.2 Status of Environmental License, Notifications and Permits for Contract 1

Permit / License Name/No.	Valid Period		Status
	From	To
Environmental Permit
EP-527/2017	21/02/2017	N/A	Valid
EP-528/2017	21/02/2017	N/A	Valid
EP-529/2017	21/02/2017	N/A	Valid
EP-530/2017	21/02/2017	N/A	Valid
EP-531/2017	21/02/2017	N/A	Valid
Notification pursuant to Air Pollution Control (Construction Dust) Regulation
N/A	N/A	N/A	Under application
Billing Account for Disposal of Construction Waste
7051388	24/06/2024	N/A	Valid
Registration of Chemical Waste Producer
5111-515-S4596-01	05/02/2025	N/A	Valid
Effluent Discharge License under Water Pollution Control Ordinance
WT00046153-2025	07-03-2025	31-03-2030	Valid
WT00046158-2025	13-03-2025	31-03-2030	Valid
WT00046303-2025	28-03-2025	31-03-2030	Valid
Construction Noise Permit (CNP)
GW-RN0075-25	03/02/2025	02/04/2025	Valid (Demolition of Existing Gantry at Part T)

 

Table 1.3 Status of Environmental License, Notifications and Permits for Contract 2

Permit / License Name/No.	Valid Period		Status
	From	To
Notification pursuant to Air Pollution Control (Construction Dust) Regulation
Notification that notifiable works are anticipated to commence (Area A) (EPD Ref. number: 10005847)	13/06/2024	N/A	Valid
Notification that notifiable works are anticipated to commence (Area B) (EPD Ref. number: 10006337)	26/06/2024	N/A	Valid
Notification that notifiable works are anticipated to commence (Area C) (EPD Ref. number: 10006331)	26/06/2024	N/A	Valid
Notification that notifiable works are anticipated to commence (Area D) (EPD Ref. number: 10006336)	26/06/2024	N/A	Valid
Billing Account for Disposal of Construction Waste
7051428	26/06/2024	N/A	Valid
Account for Registration of Chemical Waste Producer
WPN: 5213519C498001	13/08/2024	N/A	Valid
Effluent Discharge License under Water Pollution Control Ordinance
WT00045936-2025	05-03-2025	31-03-2030	Valid
Construction Noise Permit (CNP)
N/A	N/A	N/A	N/A

 
 

2              Air Quality Monitoring 2.1        Monitoring Requirement 2.1.1        In accordance with the Updated EM&A Manual (Apr 2022), the ET shall carry out impact monitoring during the construction phase of the Project. 1-hour Total Suspended Particulates (TSP) should be conducted at a frequency of at least three times in every six days when the highest dust impact occurs. 2.2        Monitoring Location 2.2.1        According to the Updated EM&A Manual (Apr 2022), the designated locations for impact air quality monitoring in related to the works contracts in the reporting period are listed in Table 2.1 and their locations are shown in Figure 2.1.

Table 2.1 Summary of Impact Air Quality Monitoring Stations in related to the works contracts in the reporting period

Station(s)	EIA ID	Monitoring Location
AM1	A204	Kam Cheong Garden
AM2	A208	Oaklands Court
AM3	A209	Ling Liang Church Primary School
AM4	A310	Tin Ha Road Playground
AM5	A415	Tin Sum Tsuen
AM6	A410	Galore Garden
AM7	A414	Shek Po Tusen
AM8a(1) (2)	A813	Block J, Tin Shing Court
AM10	A802	Kiu Tau Wai
AM11	A703	Sha Chau Lei Tsuen
AM12	A704	Ha Tsuen Shi
AM14	A601	Tseung Kong Wai
AM22	P240	Planned Village Resite at Site 4-20
AM24	P1501	Planned Port Back-up, Storage and Workshop at Site 3-8
AM25a	-	San Wai Sewage Treatment Works

Notes:

(1)     AM8a is the alternative noise monitoring stations proposed to replace AM8.

(2)     As the Owners’ Corporation for Tin Shing Court refused to grant the permission to access to carry out the set-up of monitoring equipment at the proposed location for subsequent impact monitoring period, a new location, which is at a short distance from the original location (25m), has been then identified and submitted through the proposal of the alternative monitoring location for the impact monitoring. Agreement has been obtained from IEC upon proposal of the alternative monitoring location for the impact monitoring at AM8a.

 

2.2.2        In accordance with the Table A2.4 in Appendix A of the Updated EM&A Manual (Apr 2022), impact air quality monitoring will be carried out at monitoring stations AM22, AM24 and AM25a after the occupation of the planned port back-up, storage and workshop, and the planned village resite.

 

2.2.3        As confirmed with ER, the planned port back-up, storages and workshops at Site 3-8, Site 3-14 and the planned village resite Site 4-20 are not constructed yet.  Thus, the impact air quality monitoring will be carried out at AM22, AM24 and AM25a after the construction and occupation of these planned port back-up, storages and workshops, and the planned village resite.  No air quality monitoring of the mentioned stations was carried out in this reporting period. 2.3        Monitoring Parameter and Frequency and Duration 2.3.1        In accordance to the requirements for placement of equipment, as set out in Section 4.7.1 of the Updated EM&A Manual (Apr 2022) of the Project, the monitoring parameter, frequency and duration of impact air quality monitoring are listed in Table 2.2.

Table 2.2 Parameters measured in the Impact Air Quality Monitoring

Parameter	Frequency	Duration
1-hour TSP	3 times for every 6 days	Throughout the construction phase

2.3.2        Monitoring location, time and weather conditions and any special phenomena or work underway nearby are recorded during the impact monitoring. 2.4        Monitoring Equipment 2.4.1        Upon approval of the IEC, 1-hour TSP levels can be measured by direct reading method with using handheld dust meter, which is capable of producing comparable results as that by the high-volume sampling method, to indicate short event impacts. 2.4.2        The proposed use of handheld dust meter was submitted to the IEC and agreement was obtained from the IEC in accordance with Section 4.5.5 of the Updated EM&A Manual (Apr 2022). 2.4.3        Table 2.3 summarizes the equipment used in the air quality monitoring programme. Copies of the calibration certificates of multi-parameter air quality monitoring system are shown in Appendix 2.1. Table 2.3 Air Quality Monitoring Equipment

Equipment	Manufacturer	Model	Quantity	Serial No.
Direct Reading Dust Meter	Sibata	LD-5R	6	467356 467357 467358 467359 467360 467361

2.5        Monitoring Methodology 2.5.1        The 1-hr TSP was sampled by drawing air into the portable dust monitor where particular concentrations were measured instantaneously with an in-built silicon detector sensing light scattered by the particulates in the sampled air. Continuous TSP levels were indicated and logged by a built-in data logger compatible with Windows based program to facilitate data collection, analysis and reporting. 2.5.2        The measuring procedures of the 1-hour dust meter was undertaken in accordance with the Manufacturer’s Instruction Manual as follows:

•        Placed the 1-hour dust meter at least 1.5m above ground;

•        Set POWER to “ON” and make sure that the battery level was not flashed or in low level;

•        Pulled the air sampling inlet cover up;

•        Pushed the knob at MEASURE position;

•        Set time/mode setting to [BG] by pushing the time setting switch. Then, started the background measurement by pushing the start/stop switch once. It took 6 sec. to complete the background measurement;

•        Turned knob to SENSI. ADJ position and pressed in;

•        Pushed Start/Stop switch once;

•        Gently returned knob to the MEASURE position;

•        Pushed the time setting switch to change the time setting display to [LOG] at the bottom left of the liquid crystal display;

•        Removed the cap and started measurement; and

•        Information such as sampling date, time, count value and site condition were recorded during the monitoring period

2.6        Maintenance/Calibration 2.6.1        The following maintenance/calibration was required for the direct dust meters: 2.6.2        Check and calibrate the dust meter by high volume sampler (HVS) to check the validity and accuracy of the results measured by direct reading method. Calibration of dust meter should be carried out every twelve months throughout all stages of the air quality monitoring. The calibration certificates of the monitoring equipment are presented in Appendix 2.1. 2.6.3        The correlation coefficient was checked to establish the correlation relationship between the handheld dust meter and HVS. The correlation factor was determined by comparing the results of HVS and handheld dust meter.

 

2.6.4        Checking is made prior to air quality monitoring commencing to ensure all equipment is in good working condition with necessary power supply. Zero count test were conducted before and after each monitoring event. 2.7        Action and Limit Level for Air Quality Monitoring 2.7.1            The baseline monitoring results formed the basis for determining the air quality criteria for the impact monitoring. The ET shall compare the impact monitoring results with air quality criteria set up for 1-hour TSP. Based on the baseline dust monitoring data and the derivation criteria specified above, the Action/Limit Levels are presented in Table 2.5.

Table 2.5 Action and Limit Levels for Air Quality Monitoring

Monitoring Station	Action Level (μg/m3)	Limit Level (μg/m3)
AM1	266	500
AM2	271
AM3	273
AM4	268
AM5	272
AM6	271
AM7	282
AM8a	267
AM10	271
AM11	276
AM12	273
AM14	280
AM22	274
AM24(1)	290
AM25a(1)	300

Note:

(1)     The Action Level of AM24 an AM25a was determined in the baseline monitoring under the baseline air quality monitoring of HSK/HT NDA Stage 1 Works in December 2021.

2.8        Results and Observations 2.8.1        All air quality monitoring was conducted as scheduled in the reporting period. The air quality monitoring schedule for this reporting period is shown in Appendix 1.4. 2.8.2        The air quality monitoring results in related to the works contracts in the reporting period are summarized in Table 2.6.  No Action or Limit levels exceedance was recorded in the reporting period.  Details of the results and graphical presentation are shown in Appendix 2.2. 

 

Table 2.6 Summary of Air Quality Monitoring Results in related to the works contracts in the reporting period

Monitoring Station	Averaged Measured Value (μg/m3)	Minimum Measured Value (μg/m3)	Maximum Measured Value (μg/m3)	Action Level (μg/m3)	Limit Level, (μg/m3)
AM1	18	7	25	266	500
AM2	18	9	26	271
AM3	17	11	27	273
AM4	17	4	34	268
AM5	20	9	39	272
AM6	16	11	26	271
AM7	16	9	23	282
AM8a	16	8	28	267
AM10	15	7	26	271
AM11	15	3	25	276
AM12	17	9	35	273
AM14	16	2	36	280

2.8.3        The major dust source at AM1, AM3, AM6, AM7, AM8a and AM11 included vehicle emission and dust from traffic. At AM2 and AM14, major dust sources included vehicle emission observed nearby. No other sources dust emission was observed at AM4, AM5, AM10, AM12 during air quality monitoring.

2.8.4        Weather condition of the whole baseline monitoring period varied from sunny to rainy.  Wind data during the period of baseline monitoring from the Hong Kong Observatory Lau Fau Shan Wind Station (22.46889N, 113.98361E), which is located about 1.25 km from the nearest site boundary of Contract 6. The weather information during the reporting period is summarized in Appendix 2.3.

2.9        Event and Action Plan 2.9.1        Should any non-compliance of the criteria occur, action in accordance with the Event and Action Plan in Appendix 2.4 shall be followed. Investigation of the exceedances of environmental quality performance limits should be conducted, and the ET will immediately notify the IEC and EPD, as appropriate.  The notification should be followed up with advice to the IEC and EPD on the results of the investigation, proposed actions and success of the action taken, with any necessary follow-up proposals.

 

 

3              Construction Noise Monitoring 3.1        Monitoring Requirements 3.1.1        In accordance with the Updated EM&A Manual (Apr 2022), the ET shall carry out impact monitoring during the construction phase of the Project in terms of the A-weighted equivalent continuous sound pressure level (Leq) to monitor the construction noise arising from the construction activities. The regular monitoring frequency for each monitoring station was on a weekly basis and one set of measurements between 0700 and 1900 hours on normal weekdays shall be conducted. 3.2        Monitoring Locations 3.2.1        According to the Updated EM&A Manual (Apr 2022), the monitoring designated locations for construction noise monitoring in related to the works contracts in the reporting period are listed in Table 3.1 and shown in Figure 3.1.

Table 3.1 Construction Noise Monitoring Stations near in related to the works contracts in the reporting period

Notes:

(1)     Alternative noise monitoring stations to replace the original noise monitoring stations in accordance with the Proposal of Alternative Monitoring Locations approved by EPD.

(2)     For Free Field measurement, +3 dB(A) should be added to the measured results.

 

3.2.2        As confirmed with ER, the planned residential development at Site 4-20, Site 5-22 and Site 5-24, and the planned school at Site 5-21 are not constructed yet. Thus, the impact noise monitoring will be carried out at monitoring stations CM28, CM29, CM31 and CM32 after the construction and occupation of these planned residential development and the planned school.  No noise monitoring of the mentioned stations was carried out in this reporting period. 3.3        Noise Monitoring Parameter, Frequency and Duration 3.3.1        Construction noise level was measured by the ET and measured in terms of the A-weighted equivalent continuous sound pressure level (Leq).  Leq(30mins) used as the monitoring parameter for the construction noise monitoring. 3.3.2        As supplementary information for data auditing, statistical results such as L10 and L90 were also obtained for reference. 3.3.3        Table 3.2 summarizes the monitoring parameters, duration, and frequency of construction noise monitoring.

Table 3.2 Construction Noise Monitoring Parameter, Frequency and Duration

Monitoring Station	Parameter	Frequency and Duration
CM1, CM2, CM3, CM4a, CM10, CM13, CM14, CM15a, CM16, CM18 and CM20	Leq(30mins), L10 and L90	Once every week throughout the construction phase

3.4        Monitoring Equipment, Methodology and QA / QC Procedure 3.4.1        As referred to the technical memorandum issued under the Noise Control Ordinance (NCO), sound level meters in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications were used for carrying out the construction noise monitoring. 3.4.2        Noise measurements were not made in fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s. The wind speed was checked with a portable wind speed meter capable of measuring the wind speed in m/s. 3.4.3        Sufficient numbers of noise measuring equipment and associated instrumentation were prepared by the ET. All the equipment and associated instrumentation were clearly labelled. 3.4.4        The monitoring procedures are as follows:

§  For façade measurement, the monitoring station was set at a point 1 m from the exterior of the sensitive receivers building façade and set at a position 1.2 m above the ground. For free-field measurement, the monitoring station was set at a position 1.2 m above the ground.

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

§  Parameters such as frequency weighting, the time weighting and the interval were set as follows:

-        Frequency weighting: A

-        Time weighting: Fast

-        Interval: 30 minutes (Leq(30mins))

§  Prior to and after each noise measurement, the meter was calibrated using an acoustic calibrator for 94.0 dB at 1000 Hz.  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 will be required after re-calibration or repair of the equipment.

§  At the end of the monitoring period, the values of Leq, L10 and L90 were recorded.  In addition, noise sources were recorded on a standard record sheet.

3.4.5        Table 3.3 summarizes the noise monitoring equipment used during the construction noise monitoring.  Calibration certificates for the impact noise monitoring equipment are attached in Appendix 3.1.

Table 3.3 Construction Noise Monitoring Equipment

Equipment	Manufacturer	Model	No. of Equipment	Serial No.
Sound Level Meter	SVANTEK	971	1	C119577
Sound Level Meter	Rion	NL-53	1	01130784
Acoustic Calibrator	Rion	NC-75	1	34724245

3.5        Maintenance and Calibration 3.5.1        Maintenance and calibration procedures are as follows:

§  The microphone head of the sound level meter and calibrator were regularly cleaned with a soft cloth; and

§  The sound level meter and acoustic calibrator were calibrated annually; and

§  The accuracy of the sound level meter was checked using an acoustic calibrator generating a known sound pressure level at a known frequency immediately prior to and following each noise measurement. Measurements were accepted as valid only if the calibration level from before and after the noise measurement agree to within 1.0 dB.

3.6        Action and Limit Levels 3.6.1        The Action and Limit levels were established in accordance with the Updated EM&A Manual (Apr 2022). Table 3.4 presents the Action and Limit Levels for construction noise. Should non-compliance of the criteria occur, action in accordance with the Event and Action Plan presented in Appendix 3.3 shall be carried out.

Table 3.4 Action and Limit Levels for Construction Noise Monitoring

Time Period	Action	Limit Level
07:00 – 19:00 on normal weekdays	When one or more documented complaints are received	75 dB(A)(1)

Notes:

(1)       Between 07:00 and 19:00, construction noise limit for school during normal term time is 70 dB(A) and 65 dB(A) during examination period.

 

3.7        Results and Observations 3.7.1        All air quality monitoring was conducted as scheduled in the reporting period. The air quality monitoring schedule for this reporting period is shown in Appendix 1.4. 3.7.2        No Action or Limit levels exceedance was recorded in the reporting period.  Details of the results and graphical presentation are shown in Appendix 3.2. The construction noise monitoring results are summarized in Table 3.5.

Table 3.5 Summary of Construction Noise Monitoring Results in related to the works contracts in the reporting period

 

 

 

 

Note:

(1)       For Free Field measurement, +3 dB(A) was added to the measured results.

(2)       Between 07:00 and 19:00, construction noise limit for school during normal term time is 70 dB(A) and 65 dB(A) during examination period. The examination period was between 26 March 2025 and 1 April 2025.

(3)       The measured noise level was corrected with the corresponding baseline noise level erasing any non-project related noise from the background (e.g. traffic noise, etc.) recorded during the monitoring periods.

3.7.3        During the construction noise monitoring period, road traffic noise may potentially affect the results obtained from CM1, CM2, CM3, CM4a, CM10, CM13 CM14, CM15a CM16, CM18 and CM20. 3.8            Event and Action Plan 3.8.1            Should non-compliance of the noise monitoring criteria occur, actions in accordance with the Event and Action Plan in Appendix 3.3 shall be carried out.

 

4              Water Quality 4.1        Monitoring Requirement 4.1.1        In accordance with the Updated EM&A Manual (Apr 2022), impact water quality monitoring should be carried out three days per week at all designated monitoring stations during the construction period.  The interval between two sets of monitoring should not be less than 36 hours. 4.1.2        Replicate in-situ measurements of dissolved oxygen (DO), temperature, turbidity, pH, and suspended solids (SS) for each independent sampling event shall be collected to ensure a robust statistically interpretable database. 4.2        Monitoring Location 4.2.1        Impact water quality monitoring in related to the works contracts in the reporting period was conducted at 12 monitoring stations which is summarized in Table 4.1. The location of water quality monitoring stations is shown in Figure 4.1.

Table 4.1 Summary of Impact Water Quality Monitoring Stations in related to the works contracts in the reporting period

Fresh Water System	Monitoring Station ID	Coordinates (HK Grid)		Description (1)
		Easting	Northing
TSW Main Channel and its tributaries	U2	816240	834009	U
	U5a (2)	816212	832138	U
	U6a (2)	817666	832421	U
	TS1	816815	832297	G
	TS2a (2)	817278	833493	G
	TSR1a (2)	817786	834125	G
	HT	816866	834314	G
	LUTa (2)	817547	834717	G
	D2a (2)	817483	835855	I
Tuen Mun River	D3	816437	831500	I
Upstream / Tributaries of Shan Pui River (4)	D5a (2)	819054	832288	I
	D5b (3)	819235	832442	I
	D6a (2)	818934	832032	I

Notes:

(1)       G: Gradient Station; I: Impact Station; U: Upstream Station.

(2)       U5a, U6a, TS2a, TSR1a, LUTa, D2a, D5a and D6a are the alternative water quality monitoring stations to replace U5, U6, TS2, TSR1, LUT, D2, D5 and D6, respectively, in accordance with the agreed Proposal of Alternative Monitoring Locations that was approved by EPD on 18 November 2024.

(3)       Given the block of access to water quality monitoring station D5a because of hoarding establishment works undertaken by the premises owner of the warehouse in early March 2025, an alternative location (i.e. D5b) was identified with presence of the representatives from the Supervisor Team, the IEC, the ET and the Contractor during the joint-site visit carried out on 14 March 2025 on an accessible and safe personnel basis, and the distance between WQM stations, D5a and D5b, is approximately 220m and D5b is at the downstream location of the tributary of D5a. The water sampling and measurement at D5b has been temporarily carried out since 14 March 2025 in order to ensure that the WQM programme for the Project be fully implemented. The corresponding Action and Limit Levels for various WQM parameters for the alternative location (i.e. D5b) are adopted from those for D5a. The Proposal of Alternative Monitoring Location (WQM Station at D5a) was approved by EPD on 8 April 2025.

(4)       The original monitoring station (i.e. U7) had been cancelled owing to the location was on a steep slope within densely vegetated area in which no water flowing through in wet season in accordance with the Proposal of Alternative Monitoring Locations.

 

4.3        Monitoring Parameter and Frequency 4.3.1        The monitoring parameters, frequency and duration of impact water quality monitoring are listed in Table 4.2.

Table 4.2 Parameters measured in the Impact Water Quality Monitoring

Parameter	Frequency	Duration
Dissolved oxygen (DO), temperature, turbidity, pH, stream water depth and suspended solids (SS)	3 days in a week	Throughout the construction phase

4.3.2        Monitoring location and position, time, sampling depth, weather conditions and any special phenomena or work underway nearby are recorded during the impact monitoring. 4.4        Sampling Depths & Replication 4.4.1        During impact water quality monitoring, each station was sampled. Due to a shallow water depth (less than 3 m) with low flow rates in rivers, all the monitoring would be located at mid-depth level. 4.4.2        Duplicate water samples were collected at each sampling depth for laboratory measurement of SS.  Samples were stored in high density polythene bottles, packed in ice (cooled to 4 °C without being frozen), and delivered to the laboratory on the same day of collection for analysis. 4.5        Monitoring Equipment 4.5.1        The measurement of DO, temperature, turbidity, pH and stream water depth were undertaken in-situ. In-situ monitoring instruments in compliance with the specifications listed under Section 6.8 of the Updated EM&A Manual (Apr 2022) were adopted to undertake the water quality monitoring for the Project.  Water quality monitoring equipment with the following specifications shall be supplied and maintained by the ET.

 

Dissolved Oxygen and Temperature Measuring Equipment

4.5.2        The instrument for measuring dissolved oxygen and temperature should be portable and weatherproof complete with cable, sensor, and use DC power source. The equipment was capable of measuring:

§   A dissolved oxygen level in the range of 0 – 50 mg/L and 0 – 500% saturation; and

§   The temperature within -5 – 50 °C.

4.5.3        It should have a membrane electrode with automatic temperature compensation connected with a cable. Sufficient stocks of spare electrodes and cables should be available for replacement where necessary (e.g. YSI ProDSS (multi-parameters) or an approved similar instrument).

 

pH

4.5.4        pH meter (e.g. YSI ProDSS (multi-parameters) or equivalent) should be used to measure pH value of water samples in-situ.  It should be readable in a range of 0 to 14.  Standard buffer solutions of at least pH 7 to pH 10 shall be used for calibration of the instrument before and after use.

 

Turbidity Measurement Equipment

4.5.5        The instrument should be a portable, weatherproof turbidity-measuring instrument with a comprehensive operation manual.  The equipment should use a DC power source.  It should have a photoelectric sensor capable of measuring turbidity between 0 – 4000 NTU and be equipped with a cable (e.g. YSI ProDSS (multi-parameters) or an approved similar instrument).

 

Suspended Solids

4.5.6        A water sampler should comprise a transparent PVC cylinder, with a capacity of not less than 2 litres, and should be effectively sealed with latex cups at both ends. The sampler should 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 (e.g. Wildco 2.2L Water Sampler or an approved similar instrument). 4.5.7        Water samples for suspended solids measurement shall be collected in high density polythene bottles, packed in ice (chilled to 4 °C without being frozen), and delivered to the laboratory as soon as possible after collection.

 

Water Depth Detector

4.5.8        A portable, battery-operated echo sounder should be used for determining water depth at each designated monitoring station. 4.5.9        For shallow water (less than 1 m deep), a portable water depth ruler in a range 0 – 7m should be used to measure water depth.

 

Monitoring Position Equipment

4.5.10     A hand-held or boat-fixed digital Global Positioning System (GPS) or other equivalent instrument of similar accuracy shall be provided and used during water quality monitoring to ensure the water sampling locations are correct during water quality monitoring work.

 

Water Sampling Equipment

4.5.11     A transparent PVC or glass cylinder, which has a volume of not less than 2 litres and can be sealed at both ends with cups, should be equipped with a positive latching system. During the water sampling, a messenger is released to trigger the closure of the water sampler at suitable water depth. 4.5.12     For sampling location with shallow water depth, plastic bucket would be used instead.

 

Calibration of In-situ Instruments

4.5.13     All in-situ monitoring instruments should be checked, calibrated and certified by a laboratory accredited under HOKLAS or another international accreditation scheme before use, and subsequently re-calibrated at 3-monthly intervals throughout all stages of the water quality monitoring. Responses of sensors and electrodes should be checked with certified standard solutions before each use. Wet bulb calibration for a DO meter should be carried out before measurement at each monitoring location.

 

Back-up Equipment

4.5.14     Sufficient stocks of spare parts should be maintained for replacements when necessary. Backup monitoring equipment shall also be made available so that monitoring can proceed uninterruptedly even when some equipment is under maintenance, calibration, etc. 4.5.15     Table 4.3 summarizes the equipment used in the water quality monitoring programme. Copies of the calibration certificates of multi-parameter water quality monitoring system are shown in Appendix 4.1.

Table 4.3 Water Quality Monitoring Equipment

Equipment	Model	Quantity	Serial No.	Parameter	Range	Accuracy
Water Sampler	Wildco 2.2L Water Sampler with messenger or plastic bucket (used in shallow water depth)	1	N/A	N/A	N/A	N/A
Multi-functional Water Quality Meter	YSI ProDSS (multi-parameters)	2	15M101091 22D100436	Dissolved Oxygen (DO)	0 to 500%	·    0 to 200%: ±1% of reading ·    200 to 500%: ±8% of reading
					0 to 50 mg/L	·    0 to 20 mg/L: ±0.1 mg/L or 1% of reading, whichever is greater ·    20 to 50 mg/L: ±8% of reading
				Temperature	-5 to 50 °C	±0.2 °C
				pH	0 to 14 pH units	±0.2 pH units
				Turbidity	0 to 4000 NTU	·    0 to 999 NTU: 0.3 NTU or ±2% of reading, whichever is greater ·    1000 to 4000 NTU: ±5% of reading
Water Depth Ruler	鼎峯0708	1	NA*	Water depth	0 – 7 m (Used for water depth less than 1 m)	±0.01 m
Positioning Equipment	Garmin (GPSmap 78s)	1	1WL223754	Positioning	N/A	GPS: ±1m

4.6        Monitoring Methodology 4.6.1        Water samples were collected at an appropriate water depth using a sealable transparent PVC or glass cylinder.  For locations with shallow water depth, a plastic bucket was used as an alternative. Usually, water was then transferred to the sample bottles until they were filled to the top with no remaining air space before the lid was securely screwed on.  4.6.2        Multi-functional water quality meters were checked, calibrated and certified by Quality Pro Test-Consult Limited (HOKLAS reg no. 259) before use, and would be subsequently re-calibrated at 3-monthly intervals throughout all stages of the water quality monitoring.  Responses of sensors and electrodes should be checked with certified standard solutions before each use. Wet bulb calibration for a DO meter should be carried out before measurement at each monitoring location. Sufficient stocks of spare parts should be maintained for replacements when necessary. Backup monitoring equipment should also be made available so that monitoring can proceed uninterrupted even when some equipment is under maintenance, calibration, etc. 4.6.3        Water samples for suspended solids measurement were collected in high density polythene bottles, packed in ice (chilled to 4 °C being frozen), and delivered to the laboratory as soon as possible after collection. 4.6.4        Water sampling equipment deployed during the monitoring programme was decontaminated by manual washing and rinsed with clean distilled water after each sampling location. 4.6.5        All sampling bottles were labelled with the sample ID (including the indication of sampling station), laboratory number and sampling date. Water samples were dispatched to the testing laboratory for analysis as soon as possible after the sampling.  All samples were stored in a cool box and kept at less than 4 °C but without frozen. All water samples were handled under chain of custody protocols and relinquished to the laboratory representatives at locations specified by the laboratory. The laboratory determination works started within 24 hours after collection of water samples.

 

Laboratory Analytical Methods

4.6.6        Analysis of SS was carried out by a HOKLAS accredited laboratory (Acumen Laboratory and Testing Limited).  At least two replicate samples from each independent sampling event were collected for the SS measurement.  Sufficient water samples (about 3,000 mL) were collected at the monitoring stations for carrying out the laboratory SS determination.  The analytical method for suspended solids is presented in Table 4.4.

Table 4.4 Method for Laboratory Analysis for Water Samples

Parameters	Analytical Method	Detection Limit
Suspended Solid (SS)	APHA 2540D (1)	1 mg/L

Note:   

(1)           APHA American Public Health Association Standard Methods for the Examination of Water and Wastewater.

4.7        QA/QC Requirements

 

Decontamination Procedures

4.7.1        Water sampling equipment used during the course of the monitoring process was decontaminated by manual washing and rinsed with distilled water after each sampling event. All of the disposable components/ accessories were discarded after sampling.

 

Sampling Management and Supervision

4.7.2        All sampling bottles were labelled with the sample ID numbers (including the sampling station), and sampling date. Water samples were dispatched to the testing laboratory for analysis as soon as possible. All the collected samples were stored in a cool box to keep the temperature less than 4 as possible after the sampling.  All samples were stored in a cool box and kept at less than 4 °C but without frozen.  All water samples were handled under chain of custody protocols and relinquished to the laboratory representatives at locations specified by the laboratory.

 

Quality Control Measures for Sample Testing

4.7.3        Quality control of laboratory analysis of water samples was performed by Acumen Laboratory and Testing Limited for every batch of 20 samples:

§  A minimum of 1 laboratory method blank was analyzed;

§  A minimum of 1 sample duplicate was analyzed; and

§  A minimum of 1 sample matrix spike was analyzed.

4.8        Action and Limit Level for Water Quality Monitoring 4.8.1        The criteria of action and limit levels for water quality monitoring are defined in Table 4.5.

Table 4.5 Action and Limit Levels for Water Quality

Parameters	Action Level	Limit Level
DO in mg/L	< 5%-ile of baseline data	< 4 mg/L or < 1%-ile of baseline data
SS in mg/L	> 95%-ile of baseline data	> 99%-ile of baseline data
Turbidity in NTU	> 95%-ile of baseline data	> 99%-ile of baseline data
pH	Beyond the range 6.6 to 8.4	Beyond the range of 6.5 to 8.5

Notes:

(1)       For DO, non-compliance of the water quality limit occurs when monitoring result is lower than the limit.

(2)       For SS and turbidity, non-compliance of the water quality limit occurs when monitoring result is higher than the limit.

(3)       All the figures given in the table are used for reference only and the EPD may amend the figures whenever it is considered necessary.

4.8.2        Based on the criteria listed in Table 4.5, the action and limit levels for water quality are determined in Table 4.6.

Table 4.6 Action and Limit Levels of Water Quality

Fresh Water System	Monitoring Station ID	Parameters	Action	Limit
TSW Main Channel and its tributaries	D2a	DO in mg/L	5.4	4 (1)
		SS in mg/L	14.0	15.6
		Turbidity in NTU	11.6	11.7
		pH	Less than 6.6 or greater than 8.4	Less than 6.5 or greater than 8.5
Tuen Mun River	D3	DO in mg/L	4.9	4 (2)
		SS in mg/L	59.4	67.4
		Turbidity in NTU	10.8	11.1
		pH	Less than 6.6 or greater than 8.4	Less than 6.5 or greater than 8.5
Upstream / Tributaries of Shan Pui River (4)	D5a/ D5b	DO in mg/L	5.2	4 (3)
		SS in mg/L	27.5	264.3
		Turbidity in NTU	19.3	19.4
		pH	Less than 6.6 or greater than 8.4	Less than 6.5 or greater than 8.5
	D6a	DO in mg/L	6.9	4 (4)
		SS in mg/L	16.3	18.3
		Turbidity in NTU	14.8	14.9
		pH	Less than 6.6 or greater than 8.4	Less than 6.5 or greater than 8.5

Notes:

(1)     The 1%-ile of baseline DO data at D2a is 5.4 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.

(2)     The 1%-ile of baseline DO data at D3 is 4.8 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.

(3)     The 1%-ile of baseline DO data at D5a/ D5b is 5.1 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.

(4)     The 1%-ile of baseline DO data at D6a is 6.9 mg/L, which is higher than 4 mg/L. Thus, DO concentration of 4 mg/L, which is in line with the Water Quality Objectives, is adopted as the limit level.

 

4.9        Results and Observations 4.9.1        The water quality monitoring schedule for this reporting period is shown in Appendix 1.4. The monitoring results and graphical presentation of water quality monitoring at the monitoring stations are shown in Appendix 4.2. 4.9.2        Water quality monitoring could not be conducted at the planned monitoring time on 3 March 2025 and 5 March 2025 at D6a as the station was observed dried out with algae left behind. 4.9.3        Water quality monitoring could not be conducted at the planned monitoring time on 12 March 2025 at D5a due to the limit of access to D5a from the main gate of the warehouse by the premises owner of the warehouse (Plate 4.1). Hence, an alternative location (i.e. D5b) was identified with presence of the representatives from the Supervisor Team, the IEC, the ET and the Contractor during the joint-site visit carried out on 14 March 2025 on an accessible and safe personnel basis. The distance between WQM stations, D5a and D5b, is approximately 220m and D5b is at the downstream location of the tributary of D5a. The water sampling and measurement at D5b has been temporarily carried out since 14 March 2025 in order to ensure that the WQM programme for the Project be fully implemented. The corresponding Action and Limit Levels for various WQM parameters for the alternative location (i.e. D5b) are adopted from those for D5a. The Proposal of Alternative Monitoring Location (WQM Station at D5a) was approved by EPD on 8 April 2025.

Plate 4.1 Hoarding at the Main Gate of the Warehouse Blocking the Access to D5a

4.9.4        During the reporting period, 1 action level of exceedance for SS was recorded.  Summaries of exceedance records are shown in Table 4.7 and Table 4.8.

Table 4.7 Summary of Exceedance Records of Water Quality Monitoring in related to the works contracts in the reporting period

Date	Monitoring Station	Parameter (Unit)	Averaged Measured Value	Exceedance		Exceedances due to the Project
				Action Level (AL)	Limit Level (LL)
26 March 2025	D6a	SS in mg/L	17.5	✓		×

 

Table 4.8 Summary of Exceedance Records of Water Quality Monitoring in related to the works contracts in the reporting period

Parameter	No. of exceedances		Total No. exceedances	No. of non-project related exceedances		Total No. of non-project related exceedances	No. of exceedance related to the Project		Total No. of exceedance related to the Project
	AL	LL		AL	LL		AL	LL
Dissolved Oxygen	0	0	0	0	0	0	0	0	0
Turbidity	0	0	0	0	0	0	0	0	0
Suspended Solids	1	0	1	1	0	1	0	0	0
pH	0	0	0	0	0	0	0	0	0

4.9.5        After confirmation of exceedance of the water quality monitoring results, ET has issued Notification of Exceedance (NOE) to inform relevant parties (i.e. IEC and Contractor) about the exceedances. After the investigation, the exceedance is considered as non-project related. 4.10   Event and Action Plan 4.10.1     Should any non-compliance of the criteria occur, action in accordance with the Event and Action Plan in Appendix 4.4 shall be followed. Investigation of the exceedances of environmental quality performance limits should be conducted, and the ET will immediately notify the IEC and EPD, as appropriate.  The notification should be followed up with advice to the IEC and EPD on the results of the investigation, proposed actions and success of the action taken, with any necessary follow-up proposals.

 

 

5              Waste Management 5.1.1        Waste generated from the Project include inert construction and demolition (C&D) materials and non-inert C&D wastes in the reporting period. The summarized amount of waste generated by the construction works in related to the works contracts in the reporting period is shown in Table 5.1 respectively. The cumulative waste flow table of the Project was presented in in Appendix 5.1.  

Table 5.1     Summary of Waste Generated by the Construction Works in related to the Works Contracts in the Reporting Period

Month	Total Quantity Generated	Actual Quantalities of Inert C&D Materials Generated Monthly					Actual Quantities of C&D Wastes Generated Monthly
		Hard Rock and Lage Broken Concrete	Reused in the Contract	Reused in other Projects	Disposed as Public Fill	Imported Fill	Metals	Paper / Carboard Packing	Plastics	Chemical Waste	Others e.g., general refuse
	(in ‘000m3)	(in ‘000m3)	(in ‘000m3)	(in ‘000m3)	(in ‘000m3)	(in ‘000m3)	(in ‘000kg)	(in ‘000kg)	(in ‘000kg)	(in ‘000kg)	(in ‘000m3)
January 2025	0.48	0.00	0.00	0.44	0.00	0.00	0.00	0.00	0.00	0.00	0.04
February 2025	1.51	0.00	0.00	1.50	0.00	0.00	0.00	0.00	0.00	0.00	0.01
March 2025	6.28	0.00	0.00	6.23	0.00	0.00	0.00	0.00	0.00	0.00	0.05

5.1.2        Sorting of construction and demolition (C&D) materials was carried out on site.  Sufficient numbers of receptacles were provided for general refuse collection and sorting.  Excavated inert C&D materials were reused to minimize the disposal of C&D waste to public fill. 5.1.3        The Contractor is advised to minimize the wastes generated through recycling or reusing.  All applicable mitigation measures stipulated in the Updated EM&A Manual (Apr 2022) and waste management plans will be fully implemented.

 

6              Ecology 6.1        Monitoring and Audit Requirements 6.1.1        According to the Updated EM&A Manual (Apr 2022), all sites of conservation importance are either located outside the proposed development area or retained in situ under the “Green Belt” (“GB”) zoning, except a small strip of “CA” comprising of 0.1 ha would be affected under the construction of slip road under DP12. Mitigation measures recommended in the EIA Report as the audit requirements including, preservation of existing bat species, installation of decorative screen hoarding and management of construction activities and facilities are summarized in Appendix 1.3. The monitoring and audit requirements in accordance with the Updated EM&A Manual (Apr 2022) are stated below. Audit Requirement 6.1.2        Site audits should be undertaken monthly during the construction phase of the Project to check the proper implementation and maintenance of recommended mitigation measures. 6.1.3        Site hoardings and fences will be checked regularly by the ET. Damage sighted should be reported to the site manager and damaged site hoarding/fence should be repaired by the Contractor as soon as possible. 6.1.4        Site inspection should be carried out to ensure the site formation and construction works within 100m from the boundary of the HSK egretry are not undertaken during the breeding season of ardeids, i.e. between March and August. Site inspection should be undertaken by the ET regularly to check the implementation of standard good site practices. Monitoring Requirement 6.1.5        During the construction phase, the HSK egretry will be monitored monthly during the ardeid breeding season (March to August) by qualified ecologists with at least 10 years of relevant local experience. This is to confirm if the egretry is still active during the breeding season and if the egretry is significantly disturbed (e.g., physical damage to nesting substrate or pollution of any kind) by the construction activities. In addition, no site formation and construction works should be done within 100m from the boundary of the HSK egretry during the breeding season of ardeids (March to August). 6.1.6        As the Incense Tree individual is recommended to be preserved in situ together with Tung Tau Tsuen woodland, site audit should be done to ensure that the construction work does not encroach into the woodland. 6.1.7        The construction programme of the four (foot and cycle) bridges would be phased to create disturbance-free region on TSW Main Channel during the construction phase. Construction method and sequence would also be carefully designed to minimise potential disturbance impact including water quality, noise and dust to the channel. Regular site audit would be done to guarantee that the mitigation measures would be implemented correctly. 6.2        Results and Observations 6.2.1        During the site audits that were undertaken in the reporting period, proper implementation and maintenance of the recommended mitigation measures in the EIA were checked.  

 

Egretry Monitoring

6.2.2        Egretry survey would be carried once during each reporting period that falls in the breeding season (i.e. between March and August) of the ardeids. Egretry survey would be carried out on the egretry and 100m from the egretry maximum extent at the HSK egretry. Active nests, determined by the presence of incubating adults or chicks would be counted directly by using 8-10x binoculars or by naked eyes, depending on the proximity between the surveyor and the colony. Number of active nest and tree species are the monitoring parameters applied during this reporting period. 6.2.3        As the reporting period falls in the breeding season (i.e. between March and August) of the ardeids, site inspection on ecological impact was carried out on 11 March 2025 and was only focus on the egretry and 100m from the egretry maximum extent as illustrated in Figure 6.1 and Figure 6.2. 6.2.4        During the egretry survey on 11 March 2025, the HSK Egretry were observed remaining active in breeding season 2025. A total of 2 Little Egret nests were recorded at trees on both side of the drainage channel. Two tree species have been utilized as nesting substrate, Ficus microcarpa and Melaleuca cajuputi subsp. Cumingiana. 6.2.5        The road works of another project at Hung Shui Kiu Main Street, beneath egretry trees is still on-going. The egretry has not been significantly disturbed by the road works. 6.2.6        No site formation and construction works under HSK/HT NDA Second Phase Development, has been commenced within 100m from the boundary of the HSK egretry. The works that should not be conducted within 100m from the boundary of the HSK egretry during the breeding season of the ardeids are as illustrated in Figure 6.1 and Figure 6.2. 6.2.7        Photo(s) of the site condition(s) where the egretry survey was undertaken on 11 March 2025 are presented in Plate 6.1. 

Plate 6.1 Site Condition(s) of Egretry Survey during the Reporting Month

 

2 Little Egret Nests at Trees on Both Side of the Drainage Channel

Road Works of another project at Hung Shui Kiu Main Street

The full view of the colony / trees utilized by ardeids.

 

Bat Roost Survey

6.2.8        During the reporting period, bat roost survey for precautionary check were carried out for the works contracts. In the reporting period, bat roost survey for Contract 2 was carried out on 7, 12 and 20 March 2025. The details of the bat roost survey at Contract 2 during the reporting period are summarized in Table 6.1.

Table 6.1 Schedule for Bat Roost Survey at Contract 2 during the Reporting Period

Survey Date	Findings observed during the survey
7-Mar-25	No bat roost was identified.
12-Mar-25	No bat roost was identified.
20-Mar-25	No bat roost was identified.

6.2.9        The schedule of the upcoming bat roost survey at Contract 2 in the next reporting period are summarized in Table 6.2.

Table 6.2 Upcoming Schedule for Bat Roost Survey at Contract 2 in the Next Reporting Period

	Survey Date (1)
1st Survey	2-Apr-25
2nd Survey	16-Apr-25
3rd Survey	28-Apr-25

Notes:

(1)     The schedule may be updated depends on tell-felling progress or adverse weather condition.

 

 

7              Landscape and Visual 7.1        Audit Requirements 7.1.1        According to the Updated EM&A Manual (Apr 2022), site audits should be undertaken at least once every two weeks during the construction period, by a Registered Landscape Architect (RLA). Particularly, to check that the proposed landscape and visual mitigation measures are properly implemented and maintained as per their intended objectives. Mitigation measures recommended in the EIA Report as the audit requirements including, preservation of existing vegetation, transplanting of affected trees, compensatory tree planting, control of night-time lighting glare, erection of decorative screen hoarding and management of construction activities and facilities are summarized in Appendix 1.3. 7.2        Results and Observations 7.2.1        Bi-weekly landscape and visual site audits at Contract 1 were carried out by a Registered Landscape Architect (RLA) on 14 and 26 March 2025. Bi-weekly landscape and visual site audits at Contract 2 were carried out by a Registered Landscape Architect (RLA) on 14 and 28 March 2025.  No particular observation was recorded in this reporting period. 7.3        Event and Action Plan 7.3.1        Should any non-compliance of the criteria occur, action in accordance with the Event and Action Plan in Appendix 7.1 shall be followed.
8              Environmental Site Inspection and Audit 8.1        Implementation Status of Environmental Mitigation Measures 8.1.1        Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract.  In the reporting period, site inspections at Contract 1 were carried out on 7, 14, 21 and 26 March 2025. Site inspections at Contract 2 were carried out on 7, 14, 21 and 28 March 2025. 8.1.2        Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections at Contract 1 and during the reporting period are summarized in Table 8.1.

Table 8.1 Site Observations at Contract 1 during the reporting period

Date	Key Observations/ Reminders	Follow-up Action
7 March 2025	Reminders: 1. NRMM label should be properly displayed or replaced at Part T and Hung Nga Road. 2. Stockpile should be properly covered when not in use at Part T.	Nil
14 March 2025	Observation: 1. Drip tray should be provided for chemical containers at Part T. Reminders: 1. Breaker head should be placed on impervious sheeting to prevent oil leakage at Part T. 2.  Broken sand bags should be replaced and cleaned up at Part T. 3. Stagnant water in drip tray should be cleaned up at Part H.	Rectified Measure(s) for Observation: 1. The chemical containers were removed.
21 March 2025	Reminders: 1. CNP should be placed near site entrance at Part T. 2. Decoloured NRMM label should be replaced at Part T. 3. Dusty material should be covered when not in use at Part T.	Nil
26 March 2025	No major environmental deficiency was observed during the site inspection.	Nil

8.1.3        Environmental deficiencies were observed during weekly site inspection. Key observations during the site inspections at Contract 2 and during the reporting period are summarized in Table 8.2.

 

Table 8.2 Site Observations at Contract 2 during the reporting period

Date	Key Observations/ Reminders	Follow-up Action
7 March 2025	No major environmental deficiency was observed during the site inspection.	Nil
14 March 2025	Observation: 1. Drip tray should be provided for chemical container. Reminders: 1. Notices should be posted on site to remind workers not to discharge sewage or wastewater into nearby environment. 2. Breaker head should be placed on impervious sheeting to prevent oil leakage.	Rectified Measure(s) for Observation: 1. The chemical container was removed to chemical waste container.
21 March 2025	No major environmental deficiency was observed during the site inspection.	Nil
28 March 2025	Reminder: 1. The contractor was reminded to conduct channel clearance regularly.	Nil

8.1.4        According to the EIA Study Report, Environmental Permit, contract documents and Updated EM&A Manual (Apr 2022), 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 1.3.

 
 

9              Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions 9.1        Summary of Exceedance 9.1.1        No Action Level or Limit Level exceedance was recorded for air quality monitoring in the reporting period. 9.1.2        No Action Level or Limit Level exceedance was recorded for construction noise monitoring in the reporting period. 9.1.3        During the reporting period, 1 action level of exceedance for SS was recorded. After the investigation, the exceedance is considered as non-project related. 9.2        Summary of Environmental Non-Compliance 9.2.1        No environmental non-compliance was recorded in the reporting period. 9.3        Summary of Environmental Complaint 9.3.1        No environmental complaint was received in the reporting period.  The Cumulative Complaint Log is presented in Appendix 9.1. 9.4        Summary of Environmental Summon and Successful Prosecution 9.4.1            There was no successful environmental prosecution or notification of summons received since the Project commencement. The Cumulative Log for environmental summon and successful prosecution is presented in Appendix 9.1.   10        Future Key Issues 10.1   Works and Potential Environmental Issues in the next Reporting Period 10.1.1     The Impact Monitoring Schedule for the Project for the next reporting period is presented in Appendix 10.1. 10.1.2     Works to be undertaken in the next reporting period are summarized below, and in Figure 1.2 and Figure 1.3 respectively:

Contract 1

·        Underground Utility Detection;

·        Ground Investigation Works;

·        Watermains Laying Works;

·        Construction of CLC Footing;

·        Removal of Bar Fencing

·        Excavation Works at Part T.

·        Tree Felling Works;

·        Demolition of Existing Height Restriction Gantry and Footing at Part T;

·        Construction of Pole Mount Transformer;

·        Construction of CLC Superstructure;

·        Construction of PM’s Office Footing and Superstructure;

·        Demolition of Warehouses;

·        CLC Sewerage Connection Works at Kiu Cheong Road.

 

Contract 2

·        Tree Felling;

·        Ground Investigation Works;

·        Earthworks;

·        Piezometer / Standpipe Installation;

·        Site Clearance and Tree Felling at part E;

·        Site Office Setup;

·        Pipe laying.

10.1.3     Potential environmental impacts arising from the above construction activities are mainly associated with construction noise impact, water quality impact, ecological impact, waste management, and landscape and visual. 10.2   Recommendation 10.2.1     The key environmental mitigation measures for the Project in the coming reporting period expected to be associated with the construction activities include:

Dust

§  Regular watering to reduce dust emissions from exposed site surface;

§  Stockpile of dusty materials shall be covered entirely by impervious sheeting;

§  Provide vehicles washing facilities at all site exits to wash away any dusty materials from vehicle body;

§  NRMM Labels should be displayed on the applicable equipment on site by the Contractor;

§  Provision of water sprinklers along the haul road for dust suppression.

Noise

 

§  Only well-maintained plant should be operated on-site, and plant should be maintained regularly during the construction programme; and

§  Quality Powered Mechanical Equipment (QPME) should be adopted as far as possible.

Water Quality

 

§  No effluent discharge would be allowed before acquired the effluent discharge license;

§  Surface run-off from construction sites should be discharged into dedicated discharge point via adequately designed sand/ silt removal facilities;

§  Channels/ earth bunds/ sandbags barriers should be provided on site to properly direct stormwater to silt removal facilities;

§  Silt removal facilities, channels and manholes should be maintained, and the deposited silt and grit should be removed regularly;

§  Open stockpiles of construction materials on sites should be covered with tarpaulin or similar fabric during rainstorms; and

§  Perimeter channels should be provided on site boundaries where necessary to intercept stormwater run-off from outside the site so that it will not wash across the site.

Waste Management

 

§  Provision of sufficient waste disposal points and regular collection of waste;

§  Regular cleaning and maintenance programme for drainage system; and

§  Chemical containers shall be stored with drip tray underneath.

Ecological

§  Construction activities should not be conducted within 100m from the boundary of the HSK egretry during the breeding season of the ardeids.

Landscape and Visual

 

§  Site formation and construction works within 100m from the boundary of the HSK egretry should be scheduled outside the breeding season of the ardeids which occurs between March and August.

10.2.2     The tentative schedule of regular air quality, construction noise, water quality and egretry monitoring in the next reporting period is presented in Appendix 10.1. The regular impact air quality, noise and water quality monitoring will be conducted at the same monitoring locations in the next reporting period.  

 

11        Conclusions 11.1   Conclusion 11.1.1     This 5th Monthly EM&A Report presents the EM&A works at Contract 1 and Contract 2 under the Project during the reporting period from 1 to 31 March 2025 in accordance with the Updated EM&A Manual (Apr 2022). 11.1.2     All air quality monitoring was conducted as scheduled in the reporting period. No Action Level or Limit Level exceedance was recorded for air quality monitoring in the reporting period. 11.1.3     All construction noise monitoring was conducted as scheduled in the reporting period. No Action Level or Limit Level exceedance was recorded for construction noise monitoring in the reporting period. 11.1.4     Water quality monitoring could not be conducted at the planned monitoring time on 3 March 2025 and 5 March 2025 at D6a as the station was observed dried out with algae left behind. Water quality monitoring could not be conducted at the planned monitoring time on 12 March 2025 at D5a due to the limit of access to D5a from the main gate of the warehouse by the premises owner of the warehouse. 11.1.5     During the reporting period, 1 action level of exceedance for SS was recorded. After the investigation, the exceedance is considered as non-project related. 11.1.6     Environmental site inspections were conducted at Contract 1 on 7, 14, 21 and 26 March 2025. Environmental site inspections were conducted at Contract 2 out on 7, 14, 21 and 28 March 2025. 11.1.7     No environmental non-compliance was recorded in the reporting period.  11.1.8     No environmental complaint was received in the reporting period. 11.1.9     No notification of summons and prosecution was received in the reporting period. 11.1.10 Water quality monitoring could not be conducted at the planned monitoring time on 12 March 2025 at D5a due to the limit of access to D5a from the main gate of the warehouse by the premises owner of the warehouse. Hence, an alternative location (i.e. D5b) was identified for temporary location to carry out sampling and measurement since 14 March 2025. The Proposal of Alternative Monitoring Location (WQM Station at D5a) was approved by EPD on 8 April 2025. 11.1.11 Egretry monitoring would be monitored monthly during the ardeid breeding season (i.e. March to August) by qualified ecologists with at least 10 years of relevant local experience at the HSK egretry instead of the San Sang San Tsuen egretry since March 2025. 11.1.12 The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures. 11.2   Comments/ Recommendations 11.2.1     The proposed mitigation measures were properly implemented and were considered effective and efficient in pollution control.