Contents

Executive Summary  1

1. Introduction  3

1.1 Background  3

1.2 Scope of the EM&A Report  4

1.3 Organisation Structure  4

1.4 Summary of Construction Works  5

1.5 Summary of EM&A Programme Requirements  6

1.6 Status of other Statutory Environmental Requirement  8

2. Monitoring Results  9

2.1 Air Quality Monitoring  9

2.1.1 Monitoring Requirements and Equipment 9

2.1.2 Results and Observations  9

2.2 Noise Monitoring  13

2.2.1 Monitoring Requirements and Equipment 13

2.2.2 Monitoring Schedule for the Reporting Month  13

2.2.3 Results and Observations  14

2.3 Water Quality Monitoring  14

2.3.1 Monitoring Requirements and Equipment 14

2.3.2 Monitoring Schedule for the Reporting Month  17

2.3.3 Results and Observations  17

2.4 EM&A Site Inspection  18

2.5 Waste Management  19

2.6 Implementation Status of Environmental Mitigation Measures  21

2.7 Summary oF Complaints, Notification OF Summons AND Successful Prosecutions  21

3. Future Key Issues  22

3.1 Construction Programme for the coming Three Months  22

3.2 Monitoring Schedule for the Future 3 Months  23

4. Conclusion and Recommendations  24

Annex A PROJECT ORGANISATION

Annex B Construction Programme

Annex C Environmental Licenses and Permits of the Project

Annex D1 CALIBRATION CERTIFICATES (ONSITE SENSORS)

Annex D2 CALIBRATION CERTIFICATES (TRANSFER STANDARDS)

Annex D3 AIR QUALITY MONITORING RESULTS

Annex D4 WIND CONDITIONS

Annex D5 EVENT AND ACTION PLAN FOR AIR QUALITY MONITORING

Annex E1 Calibration Certificates (Sound Level Meters and Acoustic Calibrators)

Annex E2 Noise Monitoring Schedule during Reporting Period

Annex E3 Noise Monitoring Results

Annex E4 Event and Action Plan for Noise Monitoring

Annex F1 Calibration Certificates of Water Quality Monitoring Equipment

Annex F2 Water Quality Monitoring Schedule during Reporting Period

Annex F3 Water Quality Monitoring Results

Annex F4 Event and Action Plan for Water Quality Monitoring

Annex G Waste Flow Table

Annex H Environmental Mitigation Implementation Schedule

Annex I Tentative Schedules of Environmental Monitoring for Future 3 Months

Annex J Status of EP Submissions

List of Tables

Table 1.1 Summary of Environmental Permits under the Project and the Respective Active Works Contracts  3

Table 1.2 Contact Information of Key Personnel  4

Table 1.3 Major CONStRUCTION WORKS IN THE REPORTING PERIOD  5

Table 1.4 Summary of Status for the Environmental Aspects under the EM&A Manual  6

Table 2.1 Action and Limit Levels for Air Quality (Dust) 9

Table 2.2 Air Quality Monitoring Details  9

Table 2.3 Summary of 1-Hour RSP Monitoring Results in the Reporting Period  10

Table 2.4 Summary of 24-hour rolling average RSP Monitoring Results in the Reporting Period  10

Table 2.5 Summary of 24-hour rolling average FSP Monitoring Results in the Reporting Period  10

Table 2.6 Details of Exceedances Recorded for AIR Quality Monitoring  12

Table 2.7 Action and Limit Levels for Construction noise  13

Table 2.8 Noise Monitoring Details  13

Table 2.9 Summary of Construction Noise Monitoring Results in the Reporting Period  14

Table 2.10 Calculated Action and Limit Levels for Water Quality  15

Table 2.11 Locations of Impact Water Quality Monitoring Stations and Monitoring Requirements  16

Table 2.12 Water Quality Monitoring Equipment  17

Table 2.13 Details of Exceedances Recorded for Water Quality Monitoring  17

Table 2.14 Key Observations Identified during the site inspection in this Reporting Month  18

Table 2.15 Quantities of Waste Generated in Reporting Period  20

Table 3.1 Major Construction Works in the Next Three Months  22

List of Figures

FIGURE 1.1      Location of Project

FIGURE 2.1      Locations of Air Quality Monitoring Stations

FIGURE 2.2      Locations of Noise Montioring Stations

FIGURE 2.3      Locations of Water Quality Monitoring Stations

Executive Summary

This is the Monthly Environmental Monitoring and Audit (EM&A) Report presenting the EM&A works during the period of December 2025 for the San Tin Technopole Phase 1 Development (the Project) in accordance with the EM&A Manual.  Two (2) works contracts, Package 1 Contract 1 (ND/2024/09) and Package 2 Contract 1 (ND/2024/10), are active in this reporting period.  

· The construction of ND/2024/09 commenced on 29 September 2025; and

· The construction of ND/2024/10 commenced on 18 September 2025.

A summary of EM&A activities conducted in the reporting period is listed below:

Air Quality Monitoring                             Continuous impact monitoring

Noise Monitoring

• ND/2024/09                                    5 sessions

• ND/2024/10                                    5 sessions

Water Quality Monitoring

• ND/2024/09                                    14 sessions

• ND/2024/10                                    14 sessions

Environmental Site Inspection

• ND/2024/09                                     5 sessions

• ND/2024/10                                     5 sessions

Environmental site audits, including weekly site inspections of construction works by representatives from ET, Engineer and Contractor; and joint site inspection with Independent Environmental Checker (IEC) were conducted during the reporting period.  Based on the audit results and the observation for the reporting period, environmental pollution control and mitigation measures for the Project were properly implemented.

Breaches of Action and Limit Levels for Air Quality

Thirteen (13) Limit Level exceedances were recorded for impact air quality monitoring in the reporting period.  Relevant investigation and follow-up action were conducted according to the EM&A programme.  No Project-related exceedance was recorded after investigation.

Breaches of Action and Limit Levels for Noise

No exceedance of Action and Limit Levels was recorded for impact noise monitoring in the reporting period. 

Breaches of Action and Limit Levels for Water Quality

One (1) Limit Level and one (1) Action Level exceedance were recorded for impact water quality monitoring in the reporting period.  Relevant investigations and follow-up actions were conducted according to the EM&A programme.  No Project-related exceedance was recorded after investigation.

Environmental Complaints, Non-compliance & Summons

There was no environmental complaint, notification of summons or prosecution recorded in the reporting period.

Reporting Change

There was no reporting change in the reporting period.

Key Issues For The Next Three Months

Potential environmental impacts arising from the upcoming construction activities in the next three months are mainly associated with dust emission, noise from plant operation, handling and storage of C&D materials generated from construction activities, efficiency of wastewater and drainage management and tree protection.  The ET will keep track on the construction works to confirm compliance with environmental requirements and the proper implementation of all necessary mitigation measures. 

1. Introduction

1.1 Background

San Tin Technopole Phase 1 Development (“the Project”) mainly covers innovation & technology (I&T) land parcels to the north of San Tin Highway/Fanling Highway, some residential land to the south and the key infrastructure areas with road connections. The construction of the Project will be delivered under various works contracts and its scope of works comprises the following elements:

• Site formation of land for innovation and technology development, housing, community, commercial and other developments;

• Engineering infrastructure works including but not limited to roadworks, drainage, sewerage, waterworks, pumping stations, fresh water and flushing water service reservoirs, Common Utility Tunnel (CUT) and other associated buildings / structures / E&M systems for the Project; and

• Landscaping works;

The Environmental Impact Assessment (EIA) Report for the San Tin/Lok Ma Chau Development Node (STLMC DN) (Register No. AEIAR-261/2024) was approved on 17 May 2024. Two (2) works contracts, ND/2024/09 and ND/2024/10, are active in this reporting period.  The construction of ND/2024/09 commenced on 29 September 2025, and the construction of ND/2024/10 commenced on 18 September 2025. The location of the Project, including the associated works areas of each active works contract is shown in Figure 1.1. The relevant Environmental Permits (EPs) under the Project and the respective works contracts are summarized in Table 1.1.

Table 1.1  Summary of Environmental Permits under the Project and the Respective Active Works Contracts

EP	Designated Project	Work Contracts
		ND/2024/09	ND/2024/10
EP-640/2024	San Tin / Lok Ma Chau Water Reclamation Plant	P
EP-641/2024	San Tin / Lok Ma Chau Effluent Polishing Plant	P
EP-664/2025	Revitalisation of San Tin Eastern Main Drainage Channel
EP-665/2025	Recreational Development (“Open Space”) along San Tin Western Main Drainage Channel and at Mai Po Lung Village within Deep Bay Buffer Zone 2
EP-666/2025	New Primary Distributor Road (Road P1) and District Distributor Roads (Roads D1, D2, D3, D4, D5 and D6) for San Tin / Lok Ma Chau Development Node

ERM-Hong Kong, Limited (ERM) is commissioned to undertake the role of Environmental Team (ET) for the Project in accordance with the requirements specified in the Environmental Permit(s), the Environmental Monitoring and Audit (EM&A) Manual, the EIA Report of the STLMC DN project and other relevant statutory requirements.

1.2 Scope of the EM&A Report

This is the Monthly EM&A Report for the Project which summarises the key findings of the EM&A programme during the reporting period of December 2025.

1.3 Organisation Structure

The organisation structure of the Project is shown in Annex A.  The key personnel contact names and details are summarised in Table 1.2 below.

Table 1.2  Contact Information of Key Personnel

Party	Position	Name	Telephone
Environmental Team (ET) (ERM-Hong Kong, Limited)	ET Leader	Terence Fong	2271 3156
	ET Leader Representative (EP-640/2024)	Manson Yeung	2271 3012
	ET Leader Representative (EP-641/2024)	Pako Yu	2271 3027
Independent Environmental Checker (IEC) (Mott MacDonald Hong Kong Limited)	IEC	Thomas Chan	2828 5967
	IEC Representative (EP-640/2024)	Sunny Chan	2828 5962
	IEC Representative (EP-641/2024)	Jay Chua	2828 5710
Contract No. ND/2024/09
Civil Engineering and Development Department	Senior Engineer	Vicky W.K. Yuen	3426 2590
	Engineer	Stanley C.Y. Hung	3152 3564
Engineer’s Representative (ER) (AECOM - Halcrow Joint Venture)	Chief Resident Engineer	Albert Yu	8493 0329
	Senior Resident Engineer	Timonthy Chan	8494 6981
	Senior Resident Engineer	Tony Chan	8491 4870
Contractor (CR15G - Tung Lee Joint Venture)	Construction Manager	K. K. Yuen	9498 1213
	Site Agent	Wilson Chan	9656 8865
	Sub Agent	Paul So	5989 0614
	Environmental Officer	Frank Liu	6900 3526
	Environmental Supervisor	Johnny Kam	6178 4786
Contract No. ND/2024/10
Civil Engineering and Development Department	Senior Engineer	Albert S. Lam	3547 1635
	Engineer	Patrick P.L. Wan	3152 3472
Engineer’s Representative (ER) (Arup - Binnies Joint Venture)	Senior Resident Engineer	Raymond Cheung	2908 4924
Contractor (Kuly Construction & Engineering Company Limited)	Senior Project Manager	Ma Kin Man	9552 1734
	Site Agent	Tang Wing Kai	9300 7037
	Environmental Officer	Brenda Yiu	9346 3966

1.4 Summary of Construction Works

As informed by the Contractor, details of the major construction works carried out in this reporting period are listed in Table 1.3.  The construction programme is shown in Annex B.

Table 1.3  Major CONStRUCTION WORKS IN THE REPORTING PERIOD

Construction Works Undertaken	Key Issues	Key Mitigation Measures
Contract No. ND/2024/09
• Topographic Survey • Ground Investigation Work • Wetland Enhancement Works • Tree Felling • Demolition Works • Site Formation Works • Trial pit excavation	• Dust emission • Handling and storage of construction and demolition (C&D) materials • Noise from use of Powered Mechanical Equipment (PME) • Emission of dark smoke from PMEs • Proper discharge of wastewater • Prevention and proper discharge of surface runoff • Tree protection	• Good site practices • Regular water spraying on stockpiles • Provide tarpaulin sheets coverage on stockpiles and reuse of C&D materials as far as practicable • Use of QPME and noise barrier/acoustic mat/enclosure • Regular maintenance of PMEs • Implementation of wastewater and drainage management • Retain and protect all existing trees and vegetation within the study area which are not directly affected by the works
Contract No. ND/2024/10
• Ground Investigation Work • Construction for Box Culvert • Tree Felling	• Dust emission • Handling and storage of C&D materials • Noise from use of PME • Emission of dark smoke from PMEs • Proper discharge of wastewater • Prevention and proper discharge of surface runoff • Tree protection	• Good site practices • Regular water spraying on stockpiles • Provide tarpaulin sheets coverage on stockpiles and reuse of C&D materials as far as practicable • Use of Quality Powered Mechanical Equipment (QPME) and noise barrier/acoustic mat/enclosure • Regular maintenance of PMEs • Implementation of wastewater and drainage management • Retain and protect all existing trees and vegetation within the study area which are not directly affected by the works

1.5 Summary of EM&A Programme Requirements

The status for all environmental aspects is presented in Table 1.4.  The EM&A programme requirements remained unchanged during the reporting period.

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

Parameters	Status
Air Quality
Impact Monitoring	On-going for Contract Nos. ND/2024/09 and ND/2024/10, monitoring conducted continuously.
Noise
Baseline Monitoring	The results of baseline noise monitoring for Contract Nos. ND/2024/09 and ND/2024/10 were reported in Baseline Monitoring Report and submitted to EPD under the EM&A Manual Section 16.3 and EP Condition 3.3.
Impact Monitoring	On-going for Contract Nos. ND/2024/09 and ND/2024/10, monitoring conducted once per week.
Water Quality
Baseline Monitoring	The results of baseline water quality monitoring for Contract Nos. ND/2024/09 and ND/2024/10 were reported in Baseline Monitoring Report and submitted to EPD under the EM&A Manual Section 16.3 and EP Condition 3.3.
Impact Monitoring	On-going for Contract Nos. ND/2024/09 and ND/2024/10, monitoring conducted 3 days per week.
Waste Management
Waste Monitoring	On-going
Land Contamination
Contamination Assessment Plan (CAP), Remediation Action Plan (RAP) and Remediation Report (RR)	On-going
Ecology
Wetland Compensation Monitoring (Monitoring on Construction Phase Disturbance)	The 12-month baseline monitoring was completed under NDO 08/2024. To be conducted when construction activities occur within 400m from the contiguous pond / wetland habitats on the northern portion of the Project area.
Wetland Compensation Monitoring (Monitoring on Wetland Enhancement)	The 12-month baseline monitoring was completed under NDO 08/2024.To be conducted at certain milestones between the commencement of pond filling and the full operation of San Tin Technopole.
Night Roost Monitoring	Pre-construction Night Roost Survey commenced in September 2025 and on-going at the original roosting sites until commencement of tree felling works, a standalone report for the survey will be prepared.
Egretry Monitoring	To be conducted monthly during breeding season (between March and early September).
Flight Corridor Monitoring	To be conducted when construction activities occur within this flight corridor.
Woodland Compensation Monitoring	To be conducted after completion of compensatory planting.
Post-transplantation / Post-seedling Planting Monitoring of Flora Species of Conservation Importance	To be conducted after the transplantation / seedling planting.
Post-translocation Monitoring of Fauna Species of Conservation Importance	To be conducted after the translocation.
Pre-construction Site Check and Nest Control	To be conducted in breeding season (March to July). The associated nest control measures to be conducted in non-breeding season (August to February) after pre-construction survey.
Pre-construction Site Check for Eurasian Otter	To be conducted prior to the commencement of construction activities.
Wildlife Corridor Monitoring	To be conducted upon establishment of the wildlife corridors.
Site Environmental Audit
Regular Site Inspection	On-going
Environmental Log Book	On-going

Taking into account the construction works, impact monitoring of air quality, noise, water quality and waste management were carried out in the reporting period.  The monitoring schedule of noise and water quality are provided in Annex E2 and Annex F2 respectively.

The EM&A programme also involved environmental site inspections and related auditing conducted by the ET for checking the implementation of the required environmental mitigation measures recommended in the approved EIA Report and relevant EP submissions.  The relevant EP submissions are listed in Annex J.

1.6 Status of other Statutory Environmental Requirement

The environmental licenses and permits, including EP, discharge license under Water Pollution Control Ordinance, registration as chemical waste producer, construction noise permit and specified processes license, which were valid in the reporting period are presented in Annex C.  No non-compliance with environmental statutory requirements was recorded.

2. Monitoring Results

2.1 Air Quality Monitoring

2.1.1 Monitoring Requirements and Equipment

According to the EM&A Manual of the Project, impact air quality monitoring in terms of 1-hour average Respirable Suspended Particulate (RSP), 24-hour rolling average RSP and 24-hour rolling average Fine Suspended Particulate (FSP) concentrations, was conducted continuously with air sensors.  The results of these monitoring parameters are compared with the corresponding Action and Limit levels listed in Table 2.1. 

Table 2.1  Action and Limit Levels for Air Quality (Dust)

Parameter	Action Level	Limit Level
1-hour RSP	150 μg/m^3	Not applicable
24-hour RSP (rolling average)	Not applicable	100 μg/m^3
24-hour FSP (rolling average)	Not applicable	50 μg/m^3

The monitoring locations and air sensors used in the continuous impact air quality monitoring are summarised in Table 2.2 and illustrated in Figure 2.1.  Copies of the calibration certificates for the onsite air sensors at the monitoring stations and the transfer standards are presented in Annex D1 and Annex D2 respectively.

Table 2.2  Air Quality Monitoring Details

Monitoring Station	Relevancy to Works Contract	Location	Equipment
M03	ND/2024/10	Pun Uk Tsuen	MAS-Dust (S/N: dev9204Z250700007)
M04	ND/2024/10	Chau Tau Tsuen	MAS-Dust (S/N: dev9204Z250700006)
M06	ND/2024/09	Mai Po San Tsuen	MAS-Dust (S/N: dev9204Z250800014)
M09	ND/2024/10	Wing Ping Tsuen	MAS-Dust (S/N: dev9204Z250700005)
M11	ND/2024/09	Shek Wui Wai	MAS-Dust (S/N: dev9204Z250800013)
M13	ND/2024/09	Rolling Hills (rooftop area)	MAS-Dust (S/N: dev9204Z250800016)
M14	ND/2024/09	Rolling Hills (outside of Rolling Hills)	MAS-Dust (S/N: dev9204Z250800015)
M15a ^(a)	ND/2024/09	The STEP	MAS-Dust (S/N: dev9204Z250900019)

(a) The permission from the property management office of M15a – The STEP has been granted in October 2025.  The air quality monitoring at M15a commenced on 18 October 2025.

2.1.2 Results and Observations

The monitoring data and the graphical presentation for 1-hour RSP, 24-hour rolling average RSP and 24-hour rolling average FSP concentrations are summarised in Table 2.3 to Table 2.5. Due to a power outage at monitoring station M04 between 01:00 and 11:00 on 15 December 2025, air quality monitoring at monitoring station M04 was temporarily suspended during this period.  Major dust sources in the reporting period included haul road traffic and earth moving construction activities associated with the site formation works and tree felling works.  The monitoring data and the graphical presentation are provided in Annex D3.  Wind data during the reporting period extracted from the Hong Kong Observatory (HKO)’s weather station at Wetland Park are presented in Annex D4.  

Table 2.3  Summary of 1-Hour RSP Monitoring Results in the Reporting Period

Monitoring Station	Average (µg/m^3)	Range (µg/m^3)	Action Level (µg/m^3)	Limit Level (µg/m^3)
M03	18.4	3.5 - 57.3	150	Not applicable
M04^(a)	28.8	7.2 - 69.1	150	Not applicable
M06	39.6	7.2 - 95.2	150	Not applicable
M09	34.1	7.8 - 81.7	150	Not applicable
M11	47.2	14.8 - 105.6	150	Not applicable
M13	37.4	7.6 - 86.7	150	Not applicable
M14	28.9	7.0 - 66.1	150	Not applicable
M15a	44.6	7.5 - 114.6	150	Not applicable

(a) Due to a power outage at monitoring station M04 between 01:00 and 11:00 on 15 December 2025, no 1-hour RSP data was recorded during this period.

Table 2.4  Summary of 24-hour rolling average RSP Monitoring Results in the Reporting Period

Monitoring Station	Average (µg/m^3)	Range (µg/m^3)	Action Level (µg/m^3)	Limit Level (µg/m^3)
M03	18.7	8.4 - 33.7	Not applicable	100
M04^(a)	29.0	15.0 - 42.6	Not applicable	100
M06	39.8	15.9 - 67.2	Not applicable	100
M09	34.2	15.3 - 53.3	Not applicable	100
M11	47.6	28.3 - 74.0	Not applicable	100
M13	37.6	19.0 - 64.4	Not applicable	100
M14	29.1	15.3 - 50.1	Not applicable	100
M15a	45.1	19.6 - 87.9	Not applicable	100

(a) Due to a power outage at monitoring station M04 between 01:00 and 11:00 on 15 December 2025, no 24-hour RSP data was recorded for the period from 01:00 on 15 December to 09:00 on 16 December 2025.

Table 2.5  Summary of 24-hour rolling average FSP Monitoring Results in the Reporting Period

Monitoring Station	Average (µg/m^3)	Range (µg/m^3)	Action Level (µg/m^3)	Limit Level (µg/m^3)
M03	15.1	5.5 - 29.8	Not applicable	50
M04^(a)	18.7	7.2 - 31.3	Not applicable	50
M06	18.2	6.2 - 55.8	Not applicable	50
M09	18.4	6.9 - 38.6	Not applicable	50
M11	27.3	14.5 - 42.2	Not applicable	50
M13	16.5	6.0 - 30.4	Not applicable	50
M14	15.6	5.3 - 28.3	Not applicable	50
M15a	20.9	8.0 - 41.5	Not applicable	50

(a) Due to a power outage at monitoring station M04 between 01:00 and 11:00 on 15 December 2025, no 24-hour FSP data was recorded for the period from 01:00 on 15 December to 09:00 on 16 December 2025.

Thirteen (13) Limit Level exceedances were recorded for impact air quality monitoring in the reporting period.  Investigation on the exceedances were conducted and summarised in Table 2.6 below.  No Project-related exceedance was recorded after investigation. No further action is therefore required to be undertaken in accordance with the Event and Action Plan presented in Annex D5. 

Table 2.6     Details of Exceedances Recorded for AIR Quality Monitoring 

Date	Monitoring Station	Parameter	Exceedance Level (µg/m^3)	No. of exceedance(s)	Time period	Remarks
30 Dec 2025	M06	24-hour FSP	Limit Level	8	29 Dec 2025 17:00 – 30 Dec 2025 16:59 29 Dec 2025 18:00 – 30 Dec 2025 17:59 29 Dec 2025 19:00 – 30 Dec 2025 18:59 29 Dec 2025 20:00 – 30 Dec 2025 19:59 29 Dec 2025 21:00 – 30 Dec 2025 20:59 29 Dec 2025 22:00 – 30 Dec 2025 21:59 29 Dec 2025 23:00 – 30 Dec 2025 22:59 30 Dec 2025 00:00 – 30 Dec 2025 23:59	The exceedances were unlikely caused by the construction of the Project as mitigation measures for air quality were implemented properly during the monitoring period after investigation. Moreover, the data from the EPD air quality monitoring station at Yuen Long showed elevation of 24-hour FSP during the concerned period and hence the exceedances were considered to be related to regional effects.
31 Dec 2025	M06	24-hour FSP	Limit Level	5	30 Dec 2025 01:00 – 31 Dec 2025 00:59 30 Dec 2025 02:00 – 31 Dec 2025 01:59 30 Dec 2025 03:00 – 31 Dec 2025 02:59 30 Dec 2025 04:00 – 31 Dec 2025 03:59 30 Dec 2025 05:00 – 31 Dec 2025 04:59

2.2 Noise Monitoring

2.2.1 Monitoring Requirements and Equipment

According to the EM&A Manual of the Project, noise impact monitoring was conducted once per week during the construction phase of the Project.  The Action and Limit Levels for construction noise of the Project are provided in Table 2.7 below.

Table 2.7  Action and Limit Levels for Construction noise

Time Period	Action Level	Limit Level
0700 - 1900 hours on normal weekdays	When one documented complaint is received	75 dB(A)^(a),(b)

Note:

(a) 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.

(b) 70 dB(A) and 65 dB(A) for schools during normal teaching periods and school examination periods, respectively.

Noise monitoring was performed using sound level meter at the designated monitoring stations provided in Table 2.8 and Figure 2.2, in accordance with the requirements stipulated in the EM&A Manual.  Acoustic calibrator was deployed to check the sound level meters at a known sound pressure level.  Details of the deployed equipment are provided in Table 2.8.  Copies of the calibration certificates for the equipment are presented in Annex E1. 

Table 2.8  Noise Monitoring Details

Monitoring Station	Relevancy to Works Contract	Location	Parameter and Frequency	Monitoring Dates	Equipment	Type of Measurement
CM1	ND/2024/09	69 Mai Po San Tsuen	30-minute measurement between 0700 and 1900 on normal weekdays (Monday to Saturday) Once per week for 30 mins during the construction period of the relevant works contracts of the Project	2, 8, 16, 22 & 30 December 2025	Sound Level Meter: Rion NL-52 (S/N: 00542913) Sound Level Meter: Rion NL-52 (S/N: 01010406) Acoustic Calibrator: Larson Davis CAL200 (S/N: 11333)	Free field
CM3	ND/2024/09	Scenic Heights Block B2				Free field
CM4	ND/2024/09	30 Rolling Hills Phase II				Façade
CM9	ND/2024/10	285B Wing Ping Tsuen				Free field
CM10	ND/2024/10	291 Chau Tau Tsuen				Free field
CM11	ND/2024/10	218 Chau Tau Tsuen				Free field

2.2.2 Monitoring Schedule for the Reporting Month

The schedule for noise monitoring during the reporting period is provided in Annex E2.

2.2.3 Results and Observations

Results for noise monitoring are summarised in Table 2.9.  Major noise sources during the noise monitoring included noise from use of Powered Mechanical Equipment (PME) due to pile wall construction, tree felling, demolition and site formation works. The monitoring data and the graphical presentation are provided in Annex E3. 

Table 2.9  Summary of Construction Noise Monitoring Results in the Reporting Period

Monitoring Station	Average, dB(A), Leq (30 min) (b)	Range, dB(A), Leq (30 min)	Limit Level, dB(A), Leq (30 min)
CM1 ^(a)	70.3	69.6 – 71.3	75
CM3 ^(a)	48.8	46.7 – 49.8	75
CM4	43.6	41.8 – 49.1	75
CM9 ^(a)	64.5	64.0 – 65.1	75
CM10 ^(a)	58.6	58.0 – 59.7	75
CM11 ^(a)	54.3	52.6 – 56.1	75

Note(s):

(a) A correction of +3 dB(A) was made to the free field measurements.

No exceedance of Action and Limit Levels was recorded for construction noise monitoring in the reporting period.  No action was thus required to be undertaken in accordance with the Event and Action Plan presented in Annex E4.

2.3 Water Quality Monitoring

2.3.1 Monitoring Requirements and Equipment

Water quality impact monitoring was carried out to ensure that any deterioration of water quality was detected, and that timely action was taken to rectify the situation if the deterioration of water quality is caused by the Project.  Impact water quality monitoring was undertaken three days per week during the reporting period in accordance with the EM&A Manual.  Each water quality impact monitoring was scheduled such that the interval between two water quality impact monitoring was more than 36 hours to record representative water quality data throughout the week.

Two (2) replicate in-situ measurements and samples were collected at each monitored water depth of each designated monitoring stations.  Dissolved Oxygen (DO), pH value, salinity, temperature and turbidity were measured in-situ whereas the level of suspended solids (SS) were determined by SGS Hong Kong Limited which is a HOKLAS accredited laboratory.

The calculated Action and Limit Levels of water quality monitoring with reference to the Baseline Water Quality Monitoring Report are provided in Table 2.10.

Table 2.10   Calculated Action and Limit Levels for Water Quality

Parameter	Action Level	Limit Level
San Tin Eastern Main Drainage Channel (STEMDC) - Station D1’
DO in mg/L ^(a)	1.2 mg/L	1.2 mg/L
SS in mg/L ^(b), (c)	105 mg/L, or 120% of upstream control station’s (U1a) SS recorded on the same day	113 mg/L, or 130% of upstream control station's (U1a) SS recorded on the same day
Turbidity in NTU ^(b), (c)	97 NTU, or 120% of upstream control station’s (U1a) turbidity recorded on the same day	102 NTU, or 130% of upstream control station's (U1a) turbidity recorded on the same day
San Tin Western Main Drainage Channel (STWMDC) - Stations D2a, D2b’, D2c and D2d
DO in mg/L ^(a)	1.3 mg/L	1.1 mg/L
SS in mg/L ^(b), 3	38 mg/L, or 120% of upstream control stations’ (U2a and U2b) SS recorded on the same day	46 mg/L, or 130% of upstream control stations’ (U2a and U2b) SS recorded on the same day
Turbidity in NTU ^(b), (c)	42 NTU, or 120% of upstream control stations’ (U2a and U2b) turbidity recorded on the same day	52 NTU, or 130% of upstream control stations’ (U2a and U2b) turbidity recorded on the same day
Small Watercourses along Sam Tam Road - Station D7
DO in mg/L ^(a)	0.6 mg/L	0.6 mg/L
SS in mg/L ^(b)	5 mg/L	5 mg/L
Turbidity in NTU ^(b)	11 NTU	12 NTU
Small Watercourses near Mai Po Village - Station D8
DO in mg/L ^(a)	1.4 mg/L	1.2 mg/L
SS in mg/L ^(b)	7 mg/L	8 mg/L
Turbidity in NTU ^(b)	12 NTU	13 NTU

Note(s):

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

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

(c) For clarity, the exceedance of Action / Limit Levels for SS and turbidity is considered to occur when both the baseline percentile criteria (based on 95%-ile / 99%-ile of collected baseline data) and control station criteria (based on 120% / 130% of control station data collected on the same day during impact monitoring) are exceeded. In case more than one upstream control station is involved, the higher number would be considered as the control criteria. Exceeding either the baseline percentile criteria or control station criteria alone does not constitute the exceedance of the corresponding Action / Limit Levels.

The locations of the monitoring stations under works contracts ND/2024/09 and ND/2024/10 are shown in Figure 2.3 and Table 2.11. Subjected to the safety concern arise from the unleashed dog for the access path to U1a, another location of water quality monitoring (U1a’) was selected downstream from U1a.  U1a’ is located along the same water stream of U1a and same water body as the impact monitoring station, and outside the area of influence of the works under the Project. Water quality monitoring was carried out at U1a’ on 1 and 9 December 2025. During a site visit with the Independent Environmental Checker (IEC) on 12 December 2025, it was agreed that U1a and U1a’ represent the same water body; therefore, U1a and U1a’ are considered equivalent, subject to safety considerations when selecting the monitoring location. The Proposal of Alternative Water Quality Monitoring was submitted to EPD on 23 December 2025.

Table 2.11    Locations of Impact Water Quality Monitoring Stations and Monitoring Requirements

Monitoring Station	Relevancy to Works Contract	Coordinates		Description	Parameters and Frequency	Monitoring Dates
		Easting	Northing
U1a	ND/2024/10	826721	838781	Upstream Station	In-situ measurements • DO (mg/L) • DO Saturation (%) • Salinity • Temperature (℃) • pH • Turbidity (NTU) Laboratory measurements • SS (mg/L) 3 days per week during the construction period of the relevant works contracts of the Project.	1, 3, 5, 9, 11, 13, 15, 17, 19, 22, 24, 27, 29 and 31 December 2025 (U1a’ replaced U1a on 1 and 9 December 2025)
U1a’ ^(a)	ND/2024/10	826821	838974	Upstream Station
U1b’ ^(a)	ND/2024/10	827146	840550	Upstream Station (Alternative Monitoring location of U1b)
G1a	ND/2024/10	826686	839212	Gradient Station
G1b	ND/2024/10	826472	839908	Gradient Station
G1c	ND/2024/10	826339	840303	Gradient Station
G1d	ND/2024/10	826316	840657	Gradient Station
D1’ ^(b)	ND/2024/10	825363	841421	Impact Station
U2a	ND/2024/09	826181	838334	Upstream Station		1, 3, 5, 9, 11, 13, 15, 17, 19, 22, 24, 27, 29 and 31 December 2025
U2b’ ^(b)	ND/2024/09	825517	838767	Upstream Station (Alternative Monitoring location of U2b)
G2	ND/2024/09	825588	839518	Gradient Station
D2a	ND/2024/09	825200	839396	Impact Station
D2b’ ^(b)	ND/2024/09	824726	840168	Impact Station (Alternative Monitoring location of D2b)
D2c	ND/2024/09	824846	840373	Impact Station
D2d	ND/2024/09	825239	839846	Impact Station
D7	ND/2024/09	824254	838831	Impact Station
D8	ND/2024/09	824188	839310	Impact Station

Note(s):

(a) Alternative water quality monitoring station U1a’ is used as fall-back option in case sampling at original monitoring station of U1a as per EM&A Manual is not practical due to safety condition.

Alternative water quality monitoring station U1b’ is used as fall-back option in case sampling at original monitoring station of U1b as per EM&A Manual is not practical due to low flow condition.

(b) Alternative water quality monitoring stations D1’, D2b’ and U2b’ have been adopted as replacements of the original stations D1, D2b and U2b as per EM&A Manual due to access limitations.

The equipment used in the impact water quality monitoring work is summarised in Table 2.12 below.  Copies of the calibration certificates are attached in Annex F1.

Table 2.12    Water Quality Monitoring Equipment

Parameters (Unit)	Equipment
In-situ Measurement
Dissolved Oxygen (mg/L and % of saturation)	HORIBA U-50 Series U53 (S/N: FXMONLLF)(This equipment was used till 17 December 2025) [YSI]/ [ProDSS] (S/N: 24B106616/24A103659)
Salinity (ppt)
Temperature (°C)
pH
Turbidity (NTU)
Current Velocity (m/s)	雲境天合 LS300-B
Laboratory Analysis
Suspended Solids (SS) (mg/L)	Sample Container: 1L Clear Plastic Bottle

2.3.2 Monitoring Schedule for the Reporting Month

The schedule for water quality monitoring during the reporting period is provided in Annex F2.

2.3.3 Results and Observations

A total of twenty-eight (28) monitoring events for impact water quality monitoring were conducted at all designated monitoring stations in the reporting period.  Impact water quality monitoring results and graphical presentations are provided in Annex F3. 

One (1) Limit Level and one (1) Action Level exceedance were recorded for impact water quality monitoring in the reporting period.  Investigations on the Limit Level exceedances were conducted and summarised in Table 2.13 below.

Table 2.13    Details of Exceedances Recorded for Water Quality Monitoring

Date	Monitoring Station	Parameter	Exceedance Level	Remarks
1 Dec 2025	D8	SS	Limit Level	The exceedances were unlikely caused by the construction of the Project as no construction activities that cause potential water quality impact were carried out near monitoring stations.
24 Dec 2025	D8	SS	Action Level	The exceedances were unlikely caused by the construction of the Project as no construction activities that cause potential water quality impact were carried out near monitoring stations.

No Project-related exceedances were recorded after investigation.  No further action is therefore required to be undertaken in accordance with the Event and Action Plan presented in Annex F4.

2.4   EM&A Site Inspection

Site inspections were carried out on a weekly basis with the Contractor and ER to monitor the implementation of proper environmental pollution control and mitigation measures for air quality, noise, water quality, waste management, landscape and visual impacts under the Project.  In the reporting period, five (5) site inspections were carried out on 1, 8, 17, 22 and 29 December 2025 for ND/2024/09, and five (5) site inspections were carried out on 4, 11, 16, 23 and 30 December 2025 for ND/2024/10.

EPD have conducted the site inspection on 2, 3, 5 and 18 December 2025 for ND/2024/09, reminder was provided by EPD for implementation of dust control on site to avoid related impact.

Key observations during the site inspections are summarized in Table 2.14.

Table 2.14    Key Observations Identified during the site inspection in this Reporting Month

Inspection Date	Environmental Observations	Follow-up Status
ND/2024/09
1 December 2025	• The Contractor was reminded to replace the NRMM label.	· The NRMM label has been replaced.
8 December 2025	• The Contractor was reminded to provide regular watering along the haul road to control dust.	· Haul road has been watering regularly for dust suppression.
17 December 2025	• No particular observation.	· N/A
22 December 2025	• No particular observation.	· N/A
29 December 2025	• The Contractor was reminded to cover stockpiles when not in use to prevent dust emission.	· Stockpiles of dusty material have been covered.
ND/2024/10
4 December 2025	• No particular observation.	• N/A
11 December 2025	• The Contractor was reminded to provide watering regularly along haul road.	· Watering provided along haul road.
16 December 2025	• NRMM label shall be provided for the silent piler.	· All silent pilers removed from site on 19 Dec.
23 December 2025	• Wastewater from wheel washing point overflowed outside the site. The wastewater shall be collected and treated properly prior discharge.	· Water ditch provided at washing point to prevent overflow.
30 December 2025	• The Contractor was reminded to provide watering regularly along haul road.	· Watering regularly was provided along haul road.

2.5 Waste Management

Waste generated from the Works Contracts of the Project include inert construction and demolition (C&D) materials and non-inert C&D wastes. Sorting of C&D materials was carried out on site. Sufficient numbers of receptacles were available for general refuse collection and sorting.

Reference has been made to the waste flow tables prepared by the Contractors.  The quantities of different types of waste are summarised in Table 2.15.  Details of cumulative waste management data are presented as a waste flow table in Annex G.

Table 2.15    Quantities of Waste Generated in Reporting Period

Month	Contract No.	Inert C&D Materials ^(a) (b) (m^3)	Imported Fill ^(c) (m^3)	Inert Construction Waste Reused ^(d) (m^3)	Non-inert Construction Waste ^(e)(tonnes)	Recyclable Materials ^(f) (tonnes)	Chemical Waste (tonnes)
December 2025	ND/2024/09	0.00	0.00	0.00	1564.98	0.02	0.00
	ND/2024/10	0.00	0.00	0.00	51.77	0.00	0.00
	Sub-total	0.00	0.00	0.00	1616.75	0.02	0.00

Note:

(a) Inert construction wastes include hard rock and large broken concrete, and materials disposed as public fill. 

(b) The conversion factor for inert C&D Materials is 2.4 tonnes/m³.

(c) Imported materials from any source outside of the Project.

(d) Reuse of inert construction waste generated under the Project.

(e) Non-inert construction wastes include general refuse disposed at landfill.

(f) Recyclable materials include metals, paper, cardboard, plastics and others.

2.6 Implementation Status of Environmental Mitigation Measures

A summary of the Environmental Mitigation Implementation Schedule is presented in Annex H.  The necessary mitigation measures were implemented properly for the Project.

2.7 Summary oF Complaints, Notification OF Summons AND Successful Prosecutions

There was no notification of summons or prosecution recorded in the reporting period.

3. Future Key Issues

3.1 Construction Programme for the coming Three Months

Works to be undertaken in the next three months are summarised in Table 3.1 below, together with key issues and the key mitigation measures.

Table 3.1     Major Construction Works in the Next Three Months

Construction Works to be Undertaken	Key Issues	Key Mitigation Measures
Contract No. ND/2024/09
• Topographic Survey • Ground Investigation Work • Wetland Enhancement Works • Tree Felling • Demolition Works • Site Formation Works • Trench excavation	• Dust emission • Handling and storage of C&D materials • Noise from use of PME • Emission of dark smoke from PMEs • Proper discharge of wastewater • Prevention and proper discharge of surface runoff • Tree protection	• Good site practices • Regular water spraying on stockpiles • Provide tarpaulin sheets coverage on stockpiles and reuse of C&D materials as far as practicable • Use of QPME and noise barrier/acoustic mat/enclosure • Regular maintenance of PMEs • Implementation of wastewater and drainage management • Retain and protect all existing trees and vegetation within the study area which are not directly affected by the works
Contract No. ND/2024/10
• Ground Investigation Work • Construction for Box Culvert • Construction of Sewerage Pipe	• Dust emission • Handling and storage of C&D materials • Noise from use of PME • Emission of dark smoke from PMEs • Proper discharge of wastewater • Prevention and proper discharge of surface runoff • Tree protection	• Good site practices • Regular water spraying on stockpiles • Provide tarpaulin sheets coverage on stockpiles and reuse of C&D materials as far as practicable • Use of QPME and noise barrier/acoustic mat/enclosure • Regular maintenance of PMEs • Implementation of wastewater and drainage management • Retain and protect all existing trees and vegetation within the study area which are not directly affected by the works

The ET will keep track on the construction works to confirm compliance with environmental requirements and the proper implementation of all necessary mitigation measures.  The ET will also recommend to the Contractors about the environmental toolbox topics on the abovementioned key issues for the next reporting period.

3.2 Monitoring Schedule for the Future 3 Months

The tentative schedules for environmental monitoring in January, February and March 2026 are provided in Annex I. 

4. Conclusion and Recommendations

This EM&A Report presents the findings of the EM&A activities undertaken for the Project during the period of December 2025 in accordance with the EM&A Manual and the requirements of the EPs.  The environmental monitoring, site inspection, environmental complaint handling and EM&A reporting in works areas under Contract Nos. ND/2024/09 and ND/2024/10 were covered and carried out.

Air quality (1-hour RSP, 24-hour rolling average RSP and 24-hour rolling average FSP), noise and water quality monitoring were carried out in the reporting period.

Thirteen (13) limit Level exceedances were recorded for impact air quality monitoring in the reporting period.  Relevant investigation and follow-up action were conducted according to the EM&A programme.  No Project-related exceedance was recorded after investigation.

The monitoring results for impact noise monitoring complied with the Action/ Limit levels in the reporting period.

One (1) Limit and one (1) Action Level exceedances were recorded for impact water quality monitoring in the reporting period.  Relevant investigations and follow-up actions were conducted according to the EM&A programme.  No Project-related exceedance was recorded after investigation.

Environmental site inspections were carried out during the reporting period. 

Recommendations on remedial actions were given to the Contractors for the deficiencies identified during the site inspections.

There was no environmental complaint, notification of summons or prosecution recorded in the reporting period.

The ET will keep track on the construction works to confirm compliance with environmental requirements and the proper implementation of all necessary mitigation measures.