Contents
2.1.1 Monitoring Requirements and Equipment
2.1.2 Results and Observations
2.2.1 Monitoring Requirements and Equipment
2.2.2 Monitoring Schedule for the Reporting Month
2.2.3 Results and Observations
2.3.1 Monitoring Requirements and Equipment
2.3.2 Monitoring Schedule for the Reporting Month
2.3.3 Results and Observations
2.7 Summary oF Complaints, Notification OF Summons AND Successful Prosecutions
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 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 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 1.2 Contact Information of Key Personnel
Table 1.3 Major CONSRUCTION WORKS IN THE REPORTING PERIOD
Table 1.4 Summary of Status for the Environmental Aspects under the EM&A Manual
Table 2.1 Action and Limit Levels for Air Quality (Dust)
Table 2.2 Air Quality Monitoring Details
Table 2.3 Summary of 1-Hour RSP Monitoring Results in the Reporting Period
Table 2.4 Summary of 24-hour rolling average RSP Monitoring Results in the Reporting Period
Table 2.5 Summary of 24-hour rolling average FSP Monitoring Results in the Reporting Period
Table 2.6 Details of Exceedances Recorded for AIR Quality Monitoring
Table 2.7 Action and Limit Levels for Construction noise
Table 2.8 Noise Monitoring Details
Table 2.9 Summary of Construction Noise Monitoring Results in the Reporting Period
Table 2.10 Calculated Action and Limit Levels for Water Quality
Table 2.11 Locations of Impact Water Quality Monitoring Stations and Monitoring Requirements
Table 2.12 Water Quality Monitoring Equipment
Table 2.13 Details of Exceedances Recorded for Water Quality Monitoring
Table 2.14 Key Observations Identified during the site inspection in this Reporting Month
Table 2.15 Quantities of Waste Generated in Reporting Period
LIST OF FIGURES
Executive
Summary
This is the Monthly Environmental Monitoring and Audit (EM&A) Report presenting the EM&A works during the period of October 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 4 sessions
ND/2024/10 4 sessions
Water Quality Monitoring
ND/2024/09 13 sessions
ND/2024/10 13 sessions
Environmental Site Inspection
ND/2024/09 4 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
One (1) Action Level exceedance was recorded for impact air quality monitoring in the reporting period. Relevant investigation and follow-up action were conducted according to the EM&A programme. The exceedance was considered not related to the Project 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
Two (2) Limit 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. The exceedances were considered not related to the Project 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
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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 October 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.
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Table 1.2 Contact Information of Key Personnel
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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 CONSRUCTION 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 Soldier Pile Wall Construction Tree Felling Demolition Works Site Formation Works |
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 |
To be conducted when construction activities occur within 400m from the contiguous pond / wetland habitats on the northern portion of the Project area. |
|
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. Upon the completion of re-provision of roosting substratum, night roost monitoring to be conducted monthly during dry season at the re-provision site. |
|
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/m3 |
Not applicable |
|
24-hour RSP (rolling average) |
Not applicable |
100 μg/m3 |
|
24-hour FSP (rolling average) |
Not applicable |
50 μg/m3 |
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) |
Note(s):
(a) The permission from the property management office of M15a The STEP has been granted within the reporting month. 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. 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 (΅g/m3) |
Range (΅g/m3) |
Action Level (΅g/m3) |
Limit Level (΅g/m3) |
|
M03 |
13.4 |
3.4 - 35.2 |
150 |
Not applicable |
|
M04 |
22.2 |
4.5 - 44.5 |
150 |
Not applicable |
|
M06 |
28.5 |
4.1 - 63.0 |
150 |
Not applicable |
|
M09 |
19.1 |
5.3 - 51.0 |
150 |
Not applicable |
|
M11 |
28.9 |
6.1 - 168.6 |
150 |
Not applicable |
|
M13 |
25.8 |
5.8 - 84.7 |
150 |
Not applicable |
|
M14 |
22.0 |
5.0-57.1 |
150 |
Not applicable |
|
M15a |
30.7 |
5.8 - 73.1 |
150 |
Not applicable |
Table 2.4 Summary of 24-hour rolling average RSP Monitoring Results in the Reporting Period
|
Monitoring Station |
Average (΅g/m3) |
Range (΅g/m3) |
Action Level (΅g/m3) |
Limit Level (΅g/m3) |
|
M03 |
13.3 |
6.0 - 28.0 |
Not applicable |
100 |
|
M04 |
22.1 |
8.6 - 34.2 |
Not applicable |
100 |
|
M06 |
28.3 |
11.1 - 46.3 |
Not applicable |
100 |
|
M09 |
19.0 |
8.1 - 36.6 |
Not applicable |
100 |
|
M11 |
28.7 |
13.9 - 46.2 |
Not applicable |
100 |
|
M13 |
25.6 |
10.8 - 43.0 |
Not applicable |
100 |
|
M14 |
22.1 |
9.5 - 35.6 |
Not applicable |
100 |
|
M15a |
30.9 |
12.9 - 54.4 |
Not applicable |
100 |
Table 2.5 Summary of 24-hour rolling average FSP Monitoring Results in the Reporting Period
|
Monitoring Station |
Average (΅g/m3) |
Range (΅g/m3) |
Action Level (΅g/m3) |
Limit Level (΅g/m3) |
|
M03 |
8.7 |
3.2 - 20.2 |
Not applicable |
50 |
|
M04 |
12.2 |
4.1 - 24.0 |
Not applicable |
50 |
|
M06 |
11.9 |
3.9 - 23.2 |
Not applicable |
50 |
|
M09 |
10.2 |
3.8 - 22.2 |
Not applicable |
50 |
|
M11 |
12.1 |
5.1 - 26.1 |
Not applicable |
50 |
|
M13 |
10.8 |
3.4 - 21.8 |
Not applicable |
50 |
|
M14 |
10.7 |
3.1 - 21.9 |
Not applicable |
50 |
|
M15a |
13.5 |
3.7 - 25.8 |
Not applicable |
50 |
One (1) Action Level exceedance was recorded for impact air quality monitoring in the reporting period. Investigation on the exceedance was 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 |
No. of exceedance(s) |
Time period |
Remarks |
|
21 October 2025 |
M11 |
1-hour RSP |
Action Level |
1 |
18:00-18:59 |
The exceedance was unlikely caused by the construction of the Project as no construction activity under ND/2024/09 was carried out and mitigation measures for air quality were implemented properly during the monitoring period. |
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 |
|
|
|
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|
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 |
8, 14, 21 and 28 October 2025 |
Sound Level Meter: Rion NL-52 (S/N: 00331806)
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 |
Faηade |
|||
|
CM9 |
ND/2024/10 |
285B Wing Ping Tsuen |
6, 13, 20 and 27 October 2025 |
Sound Level Meter: Rion NL-52 (S/N: 00542913)
Acoustic Calibrator: Larson Davis CAL200 (S/N: 11333) |
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), |
Range, dB(A), Leq (30 min) |
Limit Level, dB(A), Leq (30 min) |
|
CM1 (a) |
69.6 |
68.6 70.6 |
75 |
|
CM3 (a) |
53.3 |
49.3 54.8 |
75 |
|
CM4 |
47.0 |
41.7 50.2 |
75 |
|
CM9 (a) |
64.7 |
64.1 65.4 |
75 |
|
CM10 (a) |
57.7 |
54.2 60.4 |
75 |
|
CM11 (a) |
53.2 |
52.5 54.4 |
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 stations (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 stations (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.
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. |
2, 4, 6, 8, 10, 13, 15, 17, 20, 22, 24, 27 and 30 October 2025 |
|
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 |
2, 4, 6, 8, 10, 14, 16, 18, 21, 23, 25, 27 and 30 October 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 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) |
|
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-six (26) 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.
Two (2) Limit Level exceedances were recorded for impact water quality monitoring in the reporting period, including one (1) Limit Level for SS and one (1) Limit Level for Turbidity. 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 |
|
2 October 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 Station D8. |
|
10 October 2025 |
D8 |
Turbidity |
Limit Level |
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, four (4) site inspections were carried out on 8, 14, 22 and 28 October 2025 for ND/2024/09, and five (5) site inspections were carried out on 2, 10, 16, 24 and 28 October 2025 for ND/2024/10.
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 |
||
|
8 October 2025 |
· Designated area should be assigned for waste storage at Portion 1B. · Relevant EP should be displayed at all site entrances/exits. |
· Designated area has been assigned for waste storage at Portion 1B. · Relevant EP have been displayed at all site entrances/exits. |
|
14 October 2025 |
· Designated area should be assigned for waste disposal/storage at Portion 1D. · Drip tray should be placed under the oil container. |
· Designated area has been assigned for waste disposal/storage at Portion 1D. · Drip tray has been placed underneath the oil container. |
|
22 October 2025 |
· Relevant EP should be displayed at the site entrance/exit at San Tin Soccer Pitch. |
· The Relevant EP has been displayed at the site entrance and exit at San Tin Soccer Pitch. |
|
28 October 2025 |
· The Contractor was reminded to provide wheel washing facility at the site entrance, and to provide bunds to gully to direct runoff to designated treatment facility. |
· Wheel washing facility has been provided at the site entrance. Bunds to gully have been provided to direct runoff to designated treatment facility. |
|
ND/2024/10 |
||
|
2 October 2025 |
No NRMM label was displayed for the excavator. The contractor was reminded to display NRMM label for the excavator. Water spraying is not provided during breaking works. The contractor was reminded to provide water spraying for breaking works. Noise acoustic wrapping is not provided for the breaker. The contractor was reminded to provide noise acoustic wrapping for the breaker to reduce noise emission from the breaking works. |
NRMM label has been displayed for the excavator. Water spraying has been provided during breaking works. Noise acoustic wrapping has been provided for the breaker during breaking works. |
|
10 October 2025 |
No particular observation. The contractor was reminded that regular watering should be provided for exposed site surfaces and unpaved roads. |
· N/A |
|
16 October 2025 |
Accumulation of stockpiles was observed on site. The Contractor was reminded to clear the stockpile regularly or provide coverings for the stockpile. |
· Stockpile was covered by tarpaulin sheet when idle. |
|
24 October 2025 |
Breaking works without water spraying was observed on site. The Contractor was reminded to provide water spraying for breaking works. |
· Water spraying was applied during breaking works. |
|
28 October 2025 |
Open stockpiles should be covered by tarpaulin sheet. |
· Stockpile was covered by tarpaulin sheet when idle. |
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) (m3) |
Imported Fill (c) (m3) |
Inert Construction Waste Reused (d) (m3) |
Non-inert Construction Waste (e) (tonnes) |
Recyclable Materials (f) (tonnes) |
Chemical Waste (tonnes) |
|
October 2025 |
ND/2024/09 |
0.00 |
0.00 |
0.00 |
5.00 |
0.003 |
0.00 |
|
ND/2024/10 |
0.00 |
0.00 |
0.00 |
35.73 |
0.000 |
0.00 |
|
|
Sub-total |
0.00 |
0.00 |
0.00 |
40.73 |
0.003 |
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 for ND/2024/10 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 Soldier Pile Wall Construction Tree Felling Demolition Works Site Formation Works |
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 November, December 2025 and January 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 October 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.
One (1) Action Level exceedance was recorded for impact air quality monitoring in the reporting period. Relevant investigation and follow-up action were conducted according to the EM&A programme. The exceedance was considered not related to the Project after investigation.
The monitoring results for impact noise monitoring complied with the Action/ Limit levels in the reporting period.
Two (2) Limit 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. The exceedances were considered not related to the Project 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.