Executive Summary

Introduction

A1. Penta-Ocean - Concentric Joint Venture (POCJV) is contracted to carry out the Mainlaying in Tseung Kwan O under Contract No. 13/WSD/16 (hereinafter known as “the Project”).

A2. In accordance with the Environmental Monitoring and Audit (EM&A) Manual for the Project, EM&A works should be carried out by Environmental Team (ET), Acuity Sustainability Consulting Limited (ASCL), during the construction phase of the Project.

A3. This is the 43^rdMonthly EM&A Report, prepared by ASCL, for the Project summarizing the monitoring results and audit findings of the EM&A programme at and around Tseung Kwan O (TKO) during the reporting period from 1 February to 28 February 2022.

A4. The EM&A programme for this contract has covered environmental monitoring on construction noise level at selected NSRs and Contractor’s environmental performance auditing in the aspects of construction dust, construction noise, water quality, waste management, landscape and visual and ecology.

Summary of Main Works Undertaken & Key Mitigation Measures Implemented

A5. Key works carried out in this reporting period for the Project included the followings:

Location	Location	Forecast Works in Next Reporting Month
Portion H of the Project Site	TKO 137 Pit A	· Pipe installation works inside sleeve pipe between Pit 137A to Pit 137C will be conducted.
	TKO 137 Pit B
	TKO 137 Pit C
Portion J of the Project Site	Wan Po Rd – Workfront 1	· Excavation and ELS works for jacking pit 1
	Wan Po Rd – Workfront 2	· Excavation and ELS works for jacking pit 2
	Wan Po Rd – Workfront 3	· Pipe trench excavation and pipe laying
	Wan Po Rd – Workfront 4	· Pipe trench excavation and pipe laying
	Wan Po Rd – Pit A	· Setting up for MTBM pipe jacking works
	Wan Po Rd – Pit B	· Preparation for MTBM pipe jacking · Commence MTBM pipe jacking
	Shek Kok Road – Pit D	· MTBM pipe jacking
	Shek Kok Road – Hand-shield	· Construction of wing wall
	Landfill Stage 1 – Area A	· Trench excavation and pipe laying
	Pet Garden’s Road	· Trench excavation and pipe laying
	Pung Loi Road – Pit WPR1	· Excavation and ELS works for jacking pit
	Roundabout – Pit G1A	· Preparation for pipe laying between Pit G1A to Pit J1A
	Roundabout – Pit J1A	· Preparation for pipe laying between Pit G1A to Pit J1A
	Velodrome – Pit K	· Pipe installation works inside sleeve pipe between Pit K to Pit L
	Velodrome – Pit M	· Grouting for sleeve pipe between Pit M1 to M2
	Velodrome – Pit O to Pit N	· Trench excavation and pipe laying
	Velodrome – Pit O to Pit P	· Site setup works for trenchless works
	Abandoned Road near Mau Wu Tsai WF-1	· Gate valve chamber construction
	Po Lam Road South	· Trench excavation and pipe laying works
	Po Lam Road (D2)	· Trench excavation and pipe laying works
	Po Lam Road (C2)	· Pipe piling of pipe bridge at Location A Westside slop
	Po Lam Road (B4)	· Trench rock breaking · Trench excavation and pipe laying works
	Tsui Lam Road	· Predrilling for mini pile
	TKO Primary Service Reservoir	· Trench excavation and pipe laying works

A6. The major environmental impacts brought by the above construction works include:

· Construction dust and noise generation from mainlaying of pipes, TBM break through and excavation;

· Waste generation from the construction activities; and

· Impact on water quality from construction activities

A7. The key environmental mitigation measures implemented for the Project in this reporting period associated with the above construction works include:

· Reduction of construction dust generation from mainlaying of pipes, TBM break through and excavation;

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

· Sorting and storage of general refuse and construction waste; and

· Treatment of wastewater through water treatment facilities before discharge

Summary of Exceedance & Investigation & Follow-up

A8. Noise monitoring was scheduled in the reporting month for NSR4 Creative Secondary School on 4, 9, 18 and 24 February 2022 as construction works were conducted within 300m to the noise sensitive receiver. No project-related exceedance of the Action and Limit Level was recorded during the reporting period.

A9. No examinations were scheduled in the reporting month for NSR4 Creative Secondary School. Academic School Calendar can be found in Appendix O.

Complaint Handling and Prosecution

A10. No environmental complaint was received in the reporting month.

A11. Neither notifications of summons nor prosecution was received for the Project in the reporting month.

Reporting Change

A12. There were no changes reported that may affect the on-going EM&A programme.

Summary of Upcoming Key Issues and Key Mitigation Measures

A13. Key works in March 2022 (the next reporting month) for the Project will include the followings:

Location	Location	Forecast Works in Next Reporting Month
Portion H of the Project Site	TKO 137 Pit A	· Pipe installation works inside sleeve pipe between Pit 137A to Pit 137C will be conducted.
	TKO 137 Pit B
	TKO 137 Pit C
Portion J of the Project Site	Wan Po Rd – Workfront 1	· Excavation and ELS works for jacking Pit 1
	Wan Po Rd – Workfront 2	· Setup for MTMB pipe jacking
	Wan Po Rd – Workfront 3	· Pipe trench excavation and pipe laying
	Wan Po Rd – Workfront 4	· Pipe trench excavation and pipe laying
	Wan Po Rd – Pit A	· Setting up for MTBM pipe jacking works · Commence MTMB pipe jacking
	Wan Po Rd – Pit B	· MTBM pipe jacking
	Wan Po Rd – Pit D	· MTBM pipe jacking
	Shek Kok Road – Pit D	· MTBM pipe jacking.
	Shek Kok Road – Hand-shield	· Construction of wing wall.
	Landfill Stage 1 – Area A	· Trench excavation and pipe laying
	Pet Garden’s Road	· Trench excavation and pipe laying
	Pung Loi Road – Pit WPR1	· Setup for MTMB pipe jacking
	Roundabout – Pit G1A	· Pipe laying inside sleeve pipe
	Roundabout – Pit J1A	· Pipe laying inside sleeve pipe
	Velodrome – Pit K	· Grouting for sleeve pipe between Pit K to Pit L after completion of pipe laying.
	Velodrome – Pit O to Pit N	· Trench excavation and pipe laying.
	Velodrome – Pit O to Pit P	· Site setup for trenchless works.
	Mau Wu Tsai – Workfront 1	· Gate valve chamber construction · Trench reinstatement
	Po Lam Road South	· Trench excavation and pipe laying
	Po Lam Road (C2)	· Pipe piling of pipe bridge at Location A Westside slope.
	Po Lam Road (D2)	· Trench excavation and pipe laying
	Po Lam Road (B4)	· Trench rock breaking · Trench excavation and pipe laying
	Tsui Lam Road	· Predrilling for mini pile
	TKO Primary Service Reservoir	· Trench excavation and pipe laying

A14. The major environmental impacts brought by the above construction works will include:

· Construction dust and noise generation of mainlaying of pipes, TBM break through, and excavation works;

· Waste generation from construction activities; and

· Impact on water quality from construction activities.

A15. The key environmental mitigation measures for the Project in the coming reporting period associated with the above construction works will include:

· Reduction of construction dust generation of mainlaying of pipes, TBM break through and excavation works by regular water spraying and covering of dusty materials with screenings;

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

· Sorting and storage of general refuse and construction waste; and

· Treatment of wastewater through water treatment facilities before discharge.

1. Basic Project Information

1.1 Background

The proposed Desalination Plant at Tseung Kwan O (DPTKO) will produce potable water with an initial capacity of 135 million liters per day (MLD), expandable to an ultimate capacity of 270 MLD in the future to provide a secure and alternative fresh water resource complying with the World Health Organization (WHO) standards. The plant will adopt the Seawater Reverse Osmosis (SWRO) technology, which dominates the market due to its reliability and progressive reduction in cost as the technology advances.

Pursuant to the Environmental Impact Assessment Ordinance (EIAO), the Director of Environmental Protection granted the Variation of Environmental Permit (No. EP-503/2015/A) to Water Supplies Department (WSD) for the Project on 26 January 2018.

The scope of the Contract may be considered in brief, to consist of the laying of about 10 km long 1200 mm diameter fresh water mains and the associated works along the alignment of the Project as shown with the overall view in Appendix B.

1.2 The Reporting Scope

This is the 43^rd Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 February to 28 February 2022.

1.3 Project Organization

The Project Organization structure for Construction Phase is presented in Figure 1.1.

Figure 1.1 Project Organization Chart

Contact details of the key personnel are presented in Table 1.1 below:

Table 1.1 Contact details of the key personnel

Party	Position	Name	Telephone no.
Penta-Ocean - Concentric Joint Venture	Environmental Officer	Calvin Chik	9863 5630
Acuity Sustainability Consulting Limited	Environmental Team Leader	Jacky Leung	2698 6833
ANewR Consulting Limited	Independent Environmental Checker	James Choi	2618 2831

1.4 Summary of Construction Works

Details of the major construction works undertaken in this reporting period are shown in Table 1.2 and the construction works locations are shown in Appendix B. The construction programme is presented in Appendix A.

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

Location	Location	Forecast Works in Next Reporting Month
Portion H of the Project Site	TKO 137 Pit A	· Pipe installation works inside sleeve pipe between Pit 137A to Pit 137C will be conducted.
	TKO 137 Pit B
	TKO 137 Pit C
Portion J of the Project Site	Wan Po Rd – Workfront 1	· Excavation and ELS works for jacking pit 1
	Wan Po Rd – Workfront 2	· Excavation and ELS works for jacking pit 2
	Wan Po Rd – Workfront 3	· Pipe trench excavation and pipe laying
	Wan Po Rd – Workfront 4	· Pipe trench excavation and pipe laying
	Wan Po Rd – Pit A	· Setting up for MTBM pipe jacking works
	Wan Po Rd – Pit B	· Preparation for MTBM pipe jacking · Commence MTBM pipe jacking
	Shek Kok Road – Pit D	· MTBM pipe jacking
	Shek Kok Road – Hand-shield	· Construction of wing wall
	Landfill Stage 1 – Area A	· Trench excavation and pipe laying
	Pet Garden’s Road	· Trench excavation and pipe laying
	Pung Loi Road – Pit WPR1	· Excavation and ELS works for jacking pit
	Roundabout – Pit G1A	· Preparation for pipe laying between Pit G1A to Pit J1A
	Roundabout – Pit J1A	· Pipe installation works inside sleeve pipe between Pit K to Pit L will be conducted.
	Velodrome – Pit K	· Pipe installation works inside sleeve pipe between Pit K to Pit L
	Velodrome – Pit M	· Grouting for sleeve pipe between Pit M1 to M2
	Velodrome – Pit O to Pit N	· Trench excavation and pipe laying
	Velodrome – Pit O to Pit P	· Site setup works for trenchless works
	Abandoned Road near Mau Wu Tsai WF-1	· Gate valve chamber construction
	Po Lam Road South	· Trench excavation and pipe laying works
	Po Lam Road (D2)	· Trench excavation and pipe laying works
	Po Lam Road (C2)	· Pipe piling of pipe bridge at Location A Westside slop
	Po Lam Road (B4)	· Trench rock breaking · Trench excavation and pipe laying works
	Tsui Lam Road	· Predrilling for mini pile
	TKO Primary Service Reservoir	· Trench excavation and pipe laying works
	TKO 137 Pit A	· Pipe installation works inside sleeve pipe between Pit 137A to Pit 137C will be conducted.

A summary of the valid permits, licences, and or notifications on environmental protection for this Project is presented in Table 1.3.

Table 1.3 Summary of the Status of Valid Environmental Licence, Notification, Permit and Documentations

Permit/ Licences/ Notification	Reference	Validity Period
Variation of Environmental Permit	EP no.: EP-503/2015/A	Throughout the Contract
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation (Form NA)	Ref no.: 423775	Throughout the Contract
Chemical Waste Producer Registration	WPN: 5213-839-P3287-01	Throughout the Contract
Billing Account for Disposal of Construction Waste	A/C no.: 7029491	Throughout the Contract
Water Discharge Licence	WT00032336-2018	Until 31 Dec 2023
Construction Noise Permit (Hong Kong Velodrome)	GW-RE1219-21	Until 01 April 2022
Construction Noise Permit (Wan Po Road near Wan O Road and Chun Yat Street, Tseung Kwan O, N.T.)	GW-RE1211-21	Until 01 April 2022
Construction Noise Permit (Shek Kok Road near Shrewsbury International School Hong Kong, Tseung Kwan O, N.T.)	GW-RE1224-21	Until 01 April 2022

The status for all environmental aspects is presented Table 1.4.

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

Parameters	Status
Noise
Baseline Monitoring	The baseline noise monitoring result has been reported in Baseline Monitoring Report and submitted to EPD under VEP Condition 3.4.
Impact Monitoring	On-going
Waste Management
Mitigation Measures in Waste Management Plan	On-going
Landfill Gas
Impact Monitoring	On-going
Environmental Audit
Site Inspection	On-going

Other than the EM&A works by ET, regular environmental management meetings were conducted in order to enhance environmental awareness and closely monitor the environmental performance of the contractors.

The EM&A programme has been implemented in accordance with the recommendations presented in the approved EIA Report and the EM&A Manual. A summary of implementation status of the environmental mitigation measures for the construction phase of the Project during the reporting period is provided in Appendix C.

2. Noise Monitoring

2.1 Monitoring Requirements

To ensure no adverse noise impact, noise monitoring is recommended to be carried out within 300m radius from the nearby noise sensitive receivers (NSRs), during construction phase. The NSRs selected as monitoring station are (i) NSR4 – Creative Secondary School, (ii) NSR24 – PLK Laws Foundation College, and (iii) NSR31 – School of Continuing and Professional Studies – CUHK respectively.

In accordance with the EM&A Manual, baseline noise level at the noise monitoring stations were established as presented in the Baseline Monitoring Report. Impact noise monitoring will be conducted once per week in the form of 30-minute measurements Leq, L10 and L90 levels recorded at each monitoring station between 0700 and 1900 on normal weekdays.

Referring to EM&A manual Section 4.1.2, the impact noise monitoring should be carried out at all the designated monitoring stations when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations.

Impact monitoring for noise impact was conducted in the reporting month for NSR4 – Creative Secondary School on 4, 9, 18 and 24 February 2022 as construction works were conducted within 300m to the noise sensitive receiver. Detailed monitoring results can be found in Appendix G.

No examinations were scheduled in the reporting month for NSR4 Creative Secondary School. Academic School Calendar can be found in Appendix O.

2.2 Noise Monitoring Parameters, Time, Frequency

Impact noise monitoring was conducted weekly in the reporting period between 0700-1900 on normal weekdays. Construction works would follow the requirements as stipulated in the valid CNPs if works have to be conducted during 1900-0700 in all days or any time on Sundays or general holidays.

Construction noise level was measured in terms of the A-weighted equivalent continuous sound pressure level (LAeq). L_eq
30min was used as the monitoring parameter for the time period between 0700 and 1900 on normal weekdays. Table 2.1 summarizes the monitoring parameters, frequency and duration of the impact noise monitoring. The monitoring schedule is provided in Appendix D.

Table 2.1 Noise Monitoring Parameters, Time, Frequency and Duration

Time

Frequency

Duration

Parameters

Daytime:

0700-1900

Once per week

Continuously in

L_{eq 5}_min/L_{eq
30min}(average of 6 consecutive L_{eq 5min})

L_eq, L₁₀ & L₉₀

2.3 Noise Monitoring Locations

The monitoring locations should normally be made at a point 1m from the exterior of the NSRs building façade and be at a position 1.2m above the ground. A correction of +3dB(A) should be made to the free-field measurements.

According to the environmental findings detailed in the EIA report and Baseline Monitoring Report, the designated locations for the construction noise monitoring are listed in Table 2.2 below.

Table 2.2 Noise Monitoring Location

NSR ID	Noise Sensitive Receivers	Monitoring Location	Position
NSR 4	Creative Secondary School	Roof Floor	1 m from facade
NSR 24	PLK Laws Foundation College	Pedestrian Road on Ground Floor	Free-field
NSR 31	School of Continuing and Professional Studies - CUHK	Roof Floor	1 m from facade

Three noise monitoring locations for impact monitoring at the nearby sensitive receivers are shown in Figure 2.1-2.3.

Figure 2.1 NSR4 Creative Secondary School

Figure 2.2 NSR24 PLK Laws Foundation College

Figure 2.3 NSR31 School of Continuing and Professional Studies - CUHK

2.4 Impact Monitoring Methodology

Integrated sound level meters were used for the noise monitoring. The meters were in compliance with the International Electrotechnical Commission Publications 651: 1979 (Type 1) and 804: 1985 (Type 1) specifications. Immediately prior to and following each noise measurement the accuracy of the sound level meters was checked using an acoustic calibrator generating a known sound pressure level at a known frequency. Measurements may be accepted as valid only if the calibration level before and after the noise measurements agree to within 1.0 dB(A).

Calibration certificates of the instruments used are presented in Appendix E. Noise measurements were not made in the presence of fog, rain, wind with a steady speed exceeding 5 m/s or wind with gusts exceeding 10 m/s. The wind speed would be checked with a portable wind speed meter capable of measuring the wind speed in m/s.

Table 2.3 Impact Noise Monitoring Equipment

Equipment	Brand and Model	Serial Number	Date of Calibration	Calibration Certificate Expiry Date	Detection Limit
Sound Level Meter	Svantek 971	96062	05/07/2021	04/07/2022	15-140 dB(A)
Sound Level Meter Calibrator	Pulsar 105	63705	07/08/2021	06/08/2022	Nil
Pocket Wind Meter Anemometer	Kestrel 1000 Wind Meter	Nil	Nil	Nil	Nil

2.5 Action and Limit Levels

The Action/Limit Levels are in line with the criteria of Practice Note for Professional Persons (ProPECC PN 2/93) “Noise from Construction Activities – Non-statutory Controls” and Technical Memorandum on Environmental Impact Assessment Process issued by HKSAR Environmental Protection Department [“EPD”] under the Environmental Impact Assessment Ordinance, Cap 499, S.16 are presented in Table 2.4.

Table 2.4 Action and Limit Levels for Noise

Time Period

Action Level

Limit Level (dB(A))

0700-1900 on normal weekdays

When one documented complaint is received from any one of the noise sensitive receivers

· 70 dB(A) for school and

· 65 dB(A) during examination period

Notes:

(a) Limits specified in the GW-TM and IND-TM for construction and operation noise, respectively.

If exceedances are found during noise monitoring, the actions in accordance with the Event and Action Plan will be carried out according to Appendix F.

2.6 Monitoring Results and Observations

Referring to EM&A manual Section 4.1.2, impact monitoring for noise impact was scheduled weekly in the reporting month for NSR4 – Creative Secondary School on 4, 9, 18 and 24 February 2022 Detailed monitoring results are presented in Appendix G.

No examinations were scheduled in the reporting month for NSR4 Creative Secondary School. Academic School Calendar can be found in Appendix O.

No construction works were conducted within 300m radius of NSR24 and NSR31. Thus, no monitoring works was carried at these two locations in the reporting month.

3. Waste management

The waste generated from this Project includes inert construction and demolition (C&D) materials, and non-inert C&D materials. Non-inert C&D materials are made up of general refuse, vegetative wastes and recyclable wastes such as plastics and paper/cardboard packaging waste. Steel materials generated from the project are also grouped into non-inert C&D materials as these materials were not disposed of with other inert C&D materials. With reference to relevant handling records and trip tickets of this Project, the quantities of different types of waste generated in the reporting month are summarised in Table 3.1. Details of cumulative waste management data are presented as a waste flow table in Appendix H.

Table 3.1 Quantities of waste generated from the Project

Reporting period	Quantity
	Inert C&D Materials (in ‘000m3)	Chemical Waste (in ‘000kg)	Non-inert C&D Materials
			Others, e.g. General Refuse disposed at Landfill (in ‘000m3)	Recycled materials
				Paper/card board (in ‘000kg)	Plastics (in ‘000kg)	Metals (in ‘000kg)
February 2022	2.184	0.000	0.001	0.058	0.000	0.000

4. Landfill gas monitoring

4.1 Monitoring Requirement

In accordance with Section 11 of the EM&A Manual, monitoring of landfill gas is required for construction works within the 250m Consultation Zone. Part of the desalination plant and the indicative area of natural slope mitigation works fall within the SENT Landfill Extension Consultation Zone; and part of the 1,200 mm diameter fresh water mains along Wan Po Road falls within the SENT Landfill and SENT Landfill Extension Consultation Zones, TKO Stage II/III Restored Landfill and TKO Stage I Restored Landfill Consultation Zones.

4.2 Monitoring Location

Monitoring of oxygen, methane, carbon dioxide and barometric pressure was performed for excavations at 1m depth or more within the Consultation Zone. In this reporting period, 321 times of monitoring was recorded.

During construction of works within the consultation zones, excavations of 1m depth or more was monitored:

· At the ground surface before excavation commences;

· Immediately before any worker enters the excavation;

· At the beginning of each working day for the entire period when the excavation remains open; and

· Periodically through the working day whilst workers are in the excavation.

For excavations between 300mm and 1m deep, measurements should be carried out:

· Directly after the excavation has been completed; and

· Periodically whilst the excavation remains open.

The area required to be monitored for landfill gas in the reporting period are shown in Figure 4.1 to Figure 4.20.

Figure 4.1 Monitoring Location - CH.A 6+70

Figure 4.2 Monitoring Location – CH.A 12+30 ~ 12+50

Figure 4.3 Monitoring Location – CH.A 13+50 ~ 14+00 (Pit A)

Figure 4.4 Monitoring Location – CH.A 15+50 ~16+50 (Jacking Pit B)

Figure 4.5 Monitoring Location – CH.A 19+15 ~19+50 (Pit C)

Figure 4.6a Monitoring Location – Mau Wu Tsai 1

Figure 4.6b Monitoring Location – Mau Wu Tsai 2

Figure 4.6c Monitoring Location – Mau Wu Tsai 3

Figure 4.7 Monitoring Location –CH.CA 0+00 to CH.CA 04+25 (CH.C 7+40 ~ 12+00)

Figure 4.8a Monitoring Location – Pit 137A (137 Pit A)

Figure 4.8b Monitoring Location – Pit 137B (137 Pit B)

Figure 4.8c Monitoring Location – Pit 137C (137 Pit C)

Figure 4.9 Monitoring Location – Jacking Pit F

Figure 4.10a Monitoring Location – Landfill Stage 1 (Area B01-B02)

Figure 4.10b Monitoring Location – Landfill Stage 1 (FC0+64-FC0+92)

Figure 4.10c Monitoring Location – Landfill Stage 1 (FC4+30-FC5+30)

Figure 4.10d Monitoring Location – Landfill Stage 1 (FC8+38)

Figure 4.11a Monitoring Location – Pit L-M-N, J1A, K

Figure 4.11b Monitoring Location – Pit N-O-P

Figure 4.11c Monitoring Location – Pit Q

Figure 4.12 Po Lam South Road

Figure 4.13 Monitoring Location – Area A02

Figure 4.14 Monitoring Location – WPR IP1

Figure 4.15 Monitoring Location – Jacking Pit D

Figure 4.16 Monitoring Location – CH.HE0+80-1+60

Figure 4.17 Monitoring Location – Mau Wu Tsai Abandoned Road

Figure 4.18a Monitoring Location - CH.CT 0+07 ~ 2+58

Figure 4.18b Monitoring Location - CH.CT 2+58 ~ 2+66

Figure 4.19 Monitoring Location – Pit K

Figure 4.20a Monitoring Location – Wan Po Road 4

Figure 4.20b Monitoring Location – Wan Po Road 4

4.3 Monitoring Parameters

Landfill Gas monitoring was carried out to identify any migration between the landfill and the Project and to ensure the safety of the construction, operation and maintenance personnel working on-site, visitors and any other person within the Project area.

The following parameters were monitored:

· Methane.

· Oxygen.

· Carbon Dioxide.

· Barometric Pressure.

4.4 Action and Limit Level

Action and Limit Level are provided in Table 4.1.

Table 4.1 Action and Limit Level for Landfill Gas Monitoring Equipment

Parameters	Action Level	Limit Level
Oxygen (O2)	<19% O2	<19% O2
Methane (CH4)	>10% LEL	>20% LEL
Carbon Dioxide (CO2)	>0.5% CO2	>1.5% CO2

4.5 Monitoring Equipment

Landfill Gas monitoring was carried out using intrinsically-safe, portable multi-gas monitoring instruments. The gas monitoring equipment is:

· Complying with the Landfill Gas Hazard Assessment Guidance Note as intrinsically safe;

· Capable of continuous barometric pressure and gas pressure measurements;

· Normally operated in diffusion mode unless required for spot sampling, when it should be capable of operating by means of an aspirator or pump;

· Having low battery, fault and over range indication incorporated;

· Capable of storing monitoring data, and shall be capable of being down-loaded directly;

· Measure in the following ranges:

methane	0-100% Lower Explosion Limit (LEL) and 0-100% v/v;
oxygen	0-25% v/v;
carbon dioxide	0-5% v/v; and
barometric pressure	mBar (absolute)

alarm (both audibly and visually) in the event that the concentrations of the following are exceeded:

methane	>10% LEL;
oxygen	<19% by volume; and
carbon dioxide	>0.5% by volume
barometric pressure	mBar (absolute)

Monitoring Equipment used in the reporting period are summarised in Table 4.2. The Landfill Gas monitoring equipment calibration certificate is presented in Appendix I.

Table 4.2 Landfill Gas Monitoring Equipment

Equipment	Brand and Model	Calibration Expiry Date
Portable Gas Detector	QRAE III	27 July 2022
MultiRAE Lite	PGM-6208	06 April 2022
Portable Gas Detector	XT-XWHM-Y-OR	08 June 2022

4.6 Monitoring Results

In the reporting period, construction works within the consultation zones, excavations of 1m depth or more was monitored. Landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations for 321 times. All the measured results were presented in Appendix J and were within the Action and Limit Levels.

5. Summary of Monitoring Exceedance, Complaints, Notification of Summons and Prosecutions

The Environmental Complaint Handling Procedure is shown in below Figure 5.1:

complaint handling

Figure 5.1 Environmental Complaint Handling Procedure

Impact monitoring for noise impact was scheduled in the reporting month for NSR4 – Creative Secondary School on 4, 9, 18 and 24 February 2022 as construction works were conducted within 300m to the noise sensitive receiver. Detailed monitoring results can be found in Appendix G.

No examinations were scheduled in the reporting month for NSR4 Creative Secondary School. Academic School Calendar can be found in Appendix O.

Landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations and within the consultation zones for 321 times. All the measured results were presented in Appendix J and were within the Action and Limit Levels.

No exceedance of the Action and Limit Level was recorded during the reporting period.

No notification of summons and prosecution was received in the reporting period.

Statistics on complaints and regulatory compliance are summarized in Appendix K.

6. EM&A Site Inspection

Site inspections were carried out on a weekly basis to monitor the implementation of proper environmental pollution control and mitigation measures under the Contract. In the reporting period, site inspections were carried out on 11, 17 and 24 February 2022 at the site portions list in Table 6.1 below.

Table 6.1 Site Inspection Record

Date	Inspected Site Portion	Time
11 February 2022	Portion J	09:30am – 10:30am
17 February 2022	Portion J	13:15am – 14:15am
24 February 2022	Portion J	09:40am – 11:00am

One joint site inspection with IEC was carried out on 24 February 2022.

Minor deficiencies were observed during weekly site inspections. Key observations during the site inspections are summarized in Table 6.2.

Table 6.2 Site Observations

Date	Environmental Observations	Follow-up Status
11 February 2022	1. Drip tray should be provided for chemical storage at Pit X. 2. To review water mitigation measure at piling area (Pit X). 3. Regular clear the rubbish in storm drainage to avoid blockage at Pit X.	1. Chemicals were removed. 2. Sandbags was provided to direct surface runoff to wastewater treatment facilities. 3. Rubbishes in storm drainage were cleaned.
17 February 2022	1. Gullies were observed not protected by sandbags/geo-textile on 4 sides at Wan Po Road 3.	1. Gullies were protected by geo-textile.
24 February 2022	1. Drip tray should be provided for chemical storage at Pit D. 2. To establish tree protection zone at Pit D. 3. Wastewater should be properly treated before discharge at Pit A and workfrount 4b. 4. To clear stagnant water in drip tray (Pit A). 5. Gully should be covered and provide sandbags around the gully to avoid muddy surface runoff flow into gully. (workfrount 4)	1. Chemicals were removed. 2. Tree protection zone was established at Pit D. 3. There was no wastewater discharged at Pit A and workfrount 4b. 4. Stagnant water in drip tray was cleared. 5. Gully was covered by geo-textile.

According to the EIA Study Report, Environmental Permit, contract documents and EM&A Manual, the mitigation measures detailed in the documents should be implemented as much as practical during the reporting period. An updated Implementation Status of Environmental Mitigation Measures (EMIS) is provided in Appendix C.

Site inspection proforma of the reporting period is provided in Appendix L.

7. Future Key Issues

Key works that will be anticipated in the next reporting period for the Project are shown in Table 7.1.

Table 7.1. Key works for the next reporting month

Location	Location	Forecast Works in Next Reporting Month
Portion H of the Project Site	TKO 137 Pit A	· Pipe installation works inside sleeve pipe between Pit 137A to Pit 137C will be conducted.
	TKO 137 Pit B
	TKO 137 Pit C
Portion J of the Project Site	Wan Po Rd – Workfront 1	· Excavation and ELS works for jacking Pit 1
	Wan Po Rd – Workfront 2	· Setup for MTMB pipe jacking
	Wan Po Rd – Workfront 3	· Pipe trench excavation and pipe laying
	Wan Po Rd – Workfront 4	· Pipe trench excavation and pipe laying
	Wan Po Rd – Pit A	· Setting up for MTBM pipe jacking works · Commence MTMB pipe jacking
	Wan Po Rd – Pit B	· MTBM pipe jacking
	Wan Po Rd – Pit D	· MTBM pipe jacking
	Shek Kok Road – Pit D	· MTBM pipe jacking.
	Shek Kok Road – Hand-shield	· Construction of wing wall.
	Landfill Stage 1 – Area A	· Trench excavation and pipe laying
	Pet Garden’s Road	· Trench excavation and pipe laying
	Pung Loi Road – Pit WPR1	· Setup for MTMB pipe jacking
	Roundabout – Pit G1A	· Pipe laying inside sleeve pipe
	Roundabout – Pit J1A	· Preparation for pipe laying between Pit G1A to Pit J1A. · Grouting for sleeve pipe between Pit K to Pit L after completion of pipe laying.
	Velodrome – Pit K
	Velodrome – Pit O to Pit N	· Trench excavation and pipe laying.
	Velodrome – Pit O to Pit P	· Site setup for trenchless works.
	Mau Wu Tsai – Workfront 1	· Gate valve chamber construction · Trench reinstatement
	Po Lam Road South	· Trench excavation and pipe laying
	Po Lam Road (C2)	· Pipe piling of pipe bridge at Location A westside slope.
	Po Lam Road (D2)	· Trench excavation and pipe laying
	Po Lam Road (B4)	· Trench rock breaking · Trench excavation and pipe laying
	Tsui Lam Road	· Predrilling for mini pile
	TKO Primary Service Reservoir	· Trench excavation and pipe laying

The major environmental impacts brought by the above construction works will include:

· Construction dust and noise generation of mainlaying of pipes, TBM break through, and excavation works;

· Waste generation from construction activities; and

· Impact on water quality from construction activities.

The key environmental mitigation measures for the Project in the coming reporting period associated with the above construction works will include:

· Dust suppression by regular wetting and water spraying for excavation works, mainlaying of pipes and TBM break through works;

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

· Sorting and storage of general refuse and construction waste; and

· Treatment of wastewater with water treatment facilities before discharge.

The proactive environmental protection proforma for the next reporting month is listed in Appendix M.

Referring to EM&A Manual Section 4.1.2, the impact noise monitoring should be carried out at all the designated monitoring stations when there are project-related construction activities undertaken within a radius of 300m from the monitoring stations.

The tentative impact monitoring schedule for the next reporting month is attached in Appendix N.

8. Conclusion and Recommendations

This is the 43^rd monthly Environmental Monitoring and Audit (EM&A) Report presenting the EM&A works undertaken during the period from 1 February to 28 February 2022, in accordance with the EM&A Manual and the requirement under EP-503/2015/A.

No examinations were scheduled in the reporting month for NSR4 Creative Secondary School. Academic School Calendar can be found in Appendix O.

No exceedance of the Action and Limit Level was recorded during the reporting period.

Weekly environmental site inspections were conducted during the reporting month. Minor deficiencies were observed during site inspection and were rectified. The environmental performance of the project was therefore considered satisfactory.

According to the environmental site inspections performed in the reporting month, the contractor is reminded to pay attention on maintaining site tidiness, water treatment facilities, dust suppression mitigations and proper materials storage.

No environmental complaint was received in the reporting month.

No notification of summons or prosecution was received since the commencement of the Contract.

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

0	1^st Submission	10 March 2022



Rev.	Description of Modification	Date

Appendix A	Construction Programme
Appendix B	Overview of Mainlaying in Tseung Kwan O
Appendix C	Summary of Implementation Status of Environmental Mitigation
Appendix D	Impact Monitoring Schedule of the Reporting Month
Appendix E	Noise Monitoring Equipment Calibration Certificate
Appendix F	Event/Action Plan for Noise Exceedance
Appendix G	Noise Monitoring Data
Appendix H	Waste Flow Table
Appendix I	Landfill Gas Monitoring Equipment Calibration Certificate
Appendix J	Landfill Gas Monitoring Data
Appendix K	Complaint Log and Regulatory Compliance Proforma
Appendix L	Site Inspection Proforma
Appendix M	Proactive Environmental Protection Proforma
Appendix N	Impact Monitoring Schedule of Next Reporting Month
Appendix O	Academic Calendar(s)