Executive summary

The Tuen Mun South Extension (TME) is one of the seven recommended railway schemes in the Railway Development Strategy 2014 (“RDS-2014”). The project will extend the Tuen Ma Line (TML), from Tuen Mun (TUM) Station southwards by about 2.4 km, terminating at a new station near Tuen Mun Ferry Pier (i.e. Tuen Mun South (TMS) Station) with an intermediate station at Tuen Mun Area 16 (i.e. A16 Station).

The Environmental Impact Assessment (EIA) Report and its Environmental Monitoring and Audit (EM&A) Manual (Register No. AEIAR – 236/2022) for TME was approved on 12 July 2022, with an Environmental Permit

(EP) granted on 18 August 2022 (EP No. EP-615/2022).

The construction was commenced in December 2023. This is the 4^th EM&A report documents the findings of EM&A works conducted during the period from 1 to 31 March 2024.

EM&A Activities Summary

A summary of the EM&A activities in this reporting month is listed below:

EM&A Activities	Date	Details
Air Quality Monitoring	1, 7, 13, 19, 25 and 28 March 2024	Refers to Appendix A
Noise Monitoring	1, 7, 13,19 and 25 March 2024	Refers to Appendix A
Water Quality Monitoring	N/A ⁽¹⁾	Refers to Appendix A
Monthly Ardeid Monitoring	20 March 2024	Refers to Appendix B
Environmental Site Inspection	6, 13, 20 and 27 March 2024	Refers to Appendix A

Note: (1) No construction work was conducted on Tuen Mun River Channel

Breaches of Action and Limit Levels for Air Quality

No exceedances of the Action / Limit Level of 1-hour TSP due to the Project construction were recorded in the reporting month. Details is provided in Appendix A.

Breaches of Action and Limit Levels for Noise

No exceedance of the Action / Limit Level of construction noise due to the Project construction was recorded in the reporting month. Details is provided in Appendix A.

Breaches of Action and Limit Levels for Water Quality

No water quality monitoring was conducted in the reporting month. Details is provided in Appendix A.

Complaint, Notification of Summons and Successful Prosecution

No complaint, notification of summons and successful prosecution were received in the reporting month. Details is provided in Appendix A.

Reporting Changes

There was no reporting change in the reporting month.

Future Key Issues

Key issues to be considered in the next three months included the following. Details is provided in Appendix A.

Location	Site Activities
Tuen Mun River West Bank	Tree felling, tree transplantation and construction of temporary platform
Wu Shan Road Recreation Playground	Tree felling, site clearance and preparation works
Pet Garden & Eastern Garden	Site clearance and preparation works
A16 (i.e. Tuen Mun Swimming Pool)	Tree felling, tree transplantation, pre-drilling works and construction of temporary platform
Wu King Road	Tree felling, tree transplantation and utilities diversions
Loading and Unloading Area 1 & 2	Site establishment
Viaduct on Tuen Mun River Channel	Site establishment and construction of temporary platform

Potential environmental impacts arising from the above construction activities are mainly associated with construction dust, construction noise, water quality, waste management, landscape and ecology.

1 Introduction

1.1 Background

1.1.1 The Tuen Mun South Extension (TME) (hereinafter referred to as “the Project”) is one of the seven recommended railway schemes in the Railway Development Strategy 2014 (“RDS-2014”). The Project will extend the Tuen Ma Line (TML), from Tuen Mun (TUM) Station southwards by about 2.4 km, terminating at a new station near Tuen Mun Ferry Pier (i.e. Tuen Mun South (TMS) Station) with an intermediate station at Tuen Mun Area 16 (i.e. A16 Station).

1.1.2 The Environmental Impact Assessment (EIA) Report (Register No.: AEIAR-236/2022) for the Project was approved on 12 July 2022 under the Environmental Impact Assessment Ordinance (EIAO). Following the approval of the EIA Report, an Environmental Permit (EP) was granted on 18 August 2022 (EP No: EP-615/2022) for the construction and operation of the Project.

1.2 Project Programme

1.2.1 The civil construction works contract (Contract 1500) of the Project was awarded in December 2023. The construction of the Project commenced in December 2023 and expected to complete in 2030. Table 1.1 presents the information of the awarded Works Contract.

Table 1.1 Summary of Awarded Works Contract

Works Contract	Description	Construction Start Date	Contractor	Environmental Team
1500	TME Stations, Viaducts and River Crossing	December 2023	CRBC – Building King Joint Venture	WSP (Asia) Ltd.

1.3 Purpose of the Report

1.3.1 The Environmental Monitoring and Audit (EM&A) programme for the Project commenced in December 2023. This is the 4^th EM&A Report for the Project which summarises the EM&A works undertaken during the period from 1 to 31 March 2024.

2 Environmental Monitoring and Audit

2.1 EM&A Results

2.1.1 The EM&A Report for Works Contract 1500 prepared by the Contractor’s ET is provided in Appendix A. The EM&A Report provides details of the project information, EM&A requirements, impact monitoring for air quality, noise and water quality, and audit results for the Contract. The details of the monthly ardeid monitoring is presented in Appendix B.

2.1.2 A summary of the major construction activities undertaken by the Contractor of Works Contract during the reporting period are presented in Table 2.1.

Table 2.1 Summary of Major Construction Activities in the Reporting Period

Location	Site Activities
Tuen Mun River West Bank	Tree felling and preparation works of temporary platform construction
Wu Shan Road Recreation Playground	Tree felling, site clearance and preparation works
Pet Garden & Eastern Garden	Site clearance and preparation works
A16 (i.e. Tuen Mun Swimming Pool)	Tree felling, tree transplantation, preparation works of temporary platform construction and pre-drilling works
Wu King Road	Tree felling and utilities diversions
Loading and Unloading Area 1 & 2	Site establishment
Viaduct on Tuen Mun River Channel	Site establishment

2.1.3 During the reporting month, impact monitoring for air quality and construction noise were conducted in accordance with the EM&A Manual. No exceedances of the Action / Limit Level of 1-hour TSP and Action / Limit level of construction noise due to the Project construction were recorded. Results of air quality and construction noise are summarised in Tables 2.2 and 2.3 respectively. Details of the monitoring requirements, locations, equipment and methodology are presented in the EM&A Report in Appendix A.

Table 2.2 Summary of 1-Hour TSP Monitoring Results in the Reporting Period

Monitoring Station ID	Location	TSP Concentration (μg/m³)	Action Level (μg/m³)	Limit Level (μg/m³)	Exceedance due to the Project Construction (Yes/No)
AM1	Islamic Primary School	15 – 98	277.6	500	N/A
AM2a⁽¹⁾	Oi Tak House, Yau Oi Estate	19 – 111	277.4	500	N/A
AM3	Yan Chai Hospital Law Chan Chor Si Primary School	53 – 140	279.9	500	N/A
AM4	Wu Tsui House, Wu King Estate	48 – 142	279.9	500	N/A
AM5	Tuen Mun Swimming Pool	19 – 98	277.1	500	N/A

Note: (1) Alternative monitoring location to AM2 Oi Lai House, Yau Oi Estate in the approved EM&A Manual.

Table 2.3 Summary of Construction Noise Monitoring Results in the Reporting Period

Monitoring Station ID	Location	Noise Level (L_{eq, 30mins}, dB(A)	Limit Level (L_{eq, 30mins}, dB(A)	Exceedance due to the Project Construction (Yes/No)
CN1	Tower 1, Century Gateway Phase 1	63 – 67	75	N/A
CN2	Islamic Primary School	60 – 62	70	N/A
CN2	Islamic Primary School	60	65 during exams	N/A
CN3	Block 13, Lung Mun Oasis	60 – 64	75	N/A
CN4	Yan Chai Hospital Ho Sik Nam Primary School	65 – 69	70	N/A
CN4	Yan Chai Hospital Ho Sik Nam Primary School	64	65 during exams	N/A
CN5	Taoist Ching Chung Primary School	62 – 70	70	N/A
CN5	Taoist Ching Chung Primary School	63	65 during exams	N/A
CN6	Tower 1, Oceania Heights	69 – 71	75	N/A
CN7	Block 1, Pierhead Garden	62 – 65	75	N/A
CN8	Wu Fai House	56 – 59	75	N/A
CN9	Block 8, Glorious Garden	57 – 63	75	N/A
CN10	Oi Lai House, Yau Oi Estate	61 – 66	75	N/A
CN11	Wu Tsui House	60 – 64	75	N/A

2.1.4 During the reporting period, water quality monitoring was not conducted since no major construction works was carrying out at the corresponding areas (i.e. On Tuen Mun River Channel).

2.1.5 Monthly ardeid monitoring was conducted on 20 March 2024 and the detail of the monitoring is presented in Appendix B.

2.1.6 No environmental complaints, notification of summons and successful prosecutions were recorded in the reporting period.

2.1.7 Regular site inspections were conducted by the ET, ER and the Contractor on a weekly basis and IEC audits on a monthly basis to check the implementation of environmental pollution control and mitigation measures for the Project. Details are provided in Appendix A.

3 implementation status on the environmental protection requirements

3.1.1 The Contractor has implemented all mitigation measures and requirements as stated in the EIA Report, EM&A Manual and EP (EP No: EP-615/2022). Details are provided in Appendix A.

3.1.2 The status of required submissions under the EP as of the reporting period are summarised in Table 3.1.

Table 3.1 Summary of EP Submissions Status

EP Condition (EP-615/2022)	Submission	Submission date	Status
Condition 1.12	Notification of Commencement Date of Construction	4 August 2023 3 October 2023 (update)	Deposited
Condition 1.14	Notification of Commencement Date of Operation	No later than 2 months prior to the commencement of operation	To be submitted in due course
Condition 2.11	EP Submission Schedule	19 October 2023	Deposited
Condition 2.12	Management Organization	7 November 2023 18 December 2023 (update) 27 February 2024 (update)	Deposited
Condition 2.14	Construction Noise Management Plan (CNMP)	7 September 2023 13 December 2023 (update) 2 February 2024 (update)	Deposited
Condition 2.15	Rail Noise Mitigation Plan (RNMP)	23 August 2023	Pending approval
Condition 2.16	Pre-Construction Ardeid Survey Plan (PASP)	1 August 2023	Approved (18 August 2023)
Condition 2.17	Pre-Construction Ardeid Survey Report (PASR)	1 November 2023	Deposited
Condition 2.18	Monthly Ardeid Monitoring Plan (MAMP)	9 August 2023	Approved (14 November 2023)
Condition 2.18	Monthly Ardeid Monitoring Plan (MAMP)	29 January 2024 (update)	Approved (15 February 2024)
Condition 2.19	Compensatory Tree Planting Implementation Plan (CTPIP)	To be submitted no later than 6 weeks of the commencement of the construction of the corresponding parts of the Project	To be submitted in due course
Condition 2.20	Landscape and Visual Mitigation Plan (LVMP)	To be submitted no later than 2 months before the commencement of the construction of the corresponding parts of landscape and visual mitigation measures of the Project	To be submitted in due course
Condition 2.21	Waste Management Plan (WMP)	6 November 2023	Deposited
Condition 2.25	Fixed Plant Noise Audit Report	To be submitted at least 1 month before commencement of operation of the Project	To be submitted in due course
Condition 2.26	Noise Performance Test Report	To be submitted at least 1 month before commencement of operation of the Project	To be submitted in due course
Condition 3.3	Baseline Monitoring Report	11 November 2023 (Water Quality) 21 November 2023 (Dust)	Deposited
Condition 3.4	Monthly EM&A Report No.1 – 3	Submitted within 10 working days after the end of the reporting month	Deposited
Condition 3.4	Monthly EM&A Report No.4	This submission	-
Condition 4.2	Dedicated Internet Website	9 January 2024	Deposited