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 50^thMonthly 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 September to 30 September 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	Construction Works undertaken in the Reporting Month
TKO Area 137
Pit A	Pipe trench excavation and pipe laying
Pit B	Pipe laying
Pit C	Pipe trench excavation and pipe laying
Wan Po Road
Workfront 1	Pipe trench excavation and pipe laying
Workfront 2	Pipe trench excavation and pipe laying
Workfront 3	Carriageway reinstatement
Workfront 5	Pipe trench excavation and pipe laying
Workfront 6	Pipe trench excavation, pipe laying and construction of Pit A0
Pit A	Hand-shield excavation between Pit A to Pit A0
Junction of Wan O Road	Pipe trench excavation and pipe laying
Central divider near Lohas Park	Backfilling & reinstatement of central divider
Pit C1	Pipe trench excavation and pipe laying
Shek Kok Road
Pit D1	Pipe trench excavation and pipe laying
Roundabout	Trench backfilling and reinstatement
Pit D	Trench backfilling and reinstatement
Pit F	Pit construction
Creative School
--	Trench excavation and pipe laying
Pung Loi Road
Pit WPR1	TBM pipe jacking
Velodrome
Pit L – Pit M	Pipe cleaning and connection
Pit M to Pit N	Hydrostatic pressure testing for completed pipe
Po Lam Road
PLR South	Trench backfilling and reinstatement
Location A	Pipe cap construction and trench excavation and pipe laying
B3	Carriageway reinstatement
Tsui Lam Road
Locaation B	Construction of pile cap, ELS and excavation for cap construction
TKO Primary Service Reservoir
--	Pipe cleaning and CCTV survey

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

· Construction dust and noise generation from mainlaying of pipes, 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, 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 1, 7, 17, 23 and 29 September 2022 as construction works were conducted within 300m to the noise sensitive receiver. No Action and Limit Level exceedance was recorded during the reporting period.

A9. Landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations and within the consultation zones for 600 times. All the measured results were presented in Appendix J and were within the Action and Limit Levels.

Complaint Handling and Prosecution

A10. No environmental complaint, notifications of summons and prosecution was received in the reporting month.

Reporting Change

A11. There were no changes reported that may affect the on-going EM&A programme.

Summary of Upcoming Key Issues and Key Mitigation Measures

A12. Key works in the next reporting month for the Project will include the followings:

Location	Construction Works to be undertaken in the next Reporting Month
TKO Area 137
Pit A	Pipe trench excavation and pipe laying
Pit B	Pipe laying
Pit C	Pipe trench excavation and pipe laying
Wan Po Road
Workfront 1	Pipe trench excavation and pipe laying
Workfront 2	Pipe trench excavation and pipe laying
Workfront 3	Carriageway reinstatement
Workfront 4A – 4B	Pipe laying inside hand-shield tunnel
Workfront 5	Pipe trench excavation and pipe laying
Workfront 6	Pipe trench excavation, pipe laying and construction of Pit A0
Pit A	Hand-shield excavation between Pit A to Pit A0
Junction of Wan O Road	Pipe trench excavation and pipe laying
Central divider near Lohas Park	Backfilling & reinstatement of central divider
Pit C1	Construction of concrete bend block and Pit C1
Shek Kok Road
Pit D1	Pipe trench excavation and pipe laying
Roundabout	Trench backfilling and reinstatement
Pit D	Backfilling and reinstate Pit D
Lohas Park Hand-shield	Ground treatment works
Landfill Stage 1
Area A	Hydrostatic pressure testing for the completed pipe
Creative School
--	Trench excavation and pipe laying
Pung Loi Road
Pit WPR1	TBM pipe jacking
Roundabout - Pit J1A	Trench excavation and pipe laying
Velodrome
Pit L – Pit M	Casting pipe concrete thrust block and reinstalment
Pit M to Pit N	Pipe cleaning and CCTV survey
Po Lam Road
PLR South	Pipe cleaning and Hydrostatic pressure testing for the completed pipe
Location A	Trench excavation and pipe laying
Tsui Lam Road
Locaation B	ELS and excavation for cap construction
TKO Primary Service Reservoir
--	Hydrostatic pressure testing for the completed pipe

A13. The major environmental impacts brought by the above construction works will include:

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

· Waste generation from construction activities; and

· Impact on water quality from construction activities.

A14. 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, 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

2.1 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 freshwater 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 freshwater mains and the associated works along the alignment of the Project as shown with the overall view in Appendix B.

2.2 The Reporting Scope

This is the 50^th Monthly EM&A Report for the Project which summarizes the key findings of the EM&A programme during the reporting period from 1 September to 30 September 2022.

2.3 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

2.4 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	Construction Works undertaken in the Reporting Month
TKO Area 137
Pit A	Pipe trench excavation and pipe laying
Pit B	Pipe laying
Pit C	Pipe trench excavation and pipe laying
Wan Po Road
Workfront 1	Pipe trench excavation and pipe laying
Workfront 2	Pipe trench excavation and pipe laying
Workfront 3	Carriageway reinstatement
Workfront 5	Pipe trench excavation and pipe laying
Workfront 6	Pipe trench excavation, pipe laying and construction of Pit A0
Pit A	Hand-shield excavation between Pit A to Pit A0
Junction of Wan O Road	Pipe trench excavation and pipe laying
Central divider near Lohas Park	Backfilling & reinstatement of central divider
Pit C1	Pipe trench excavation and pipe laying
Shek Kok Road
Pit D1	Pipe trench excavation and pipe laying
Roundabout	Trench backfilling and reinstatement
Pit D	Trench backfilling and reinstatement
Pit F	Pit construction
Creative School
--	Trench excavation and pipe laying
Pung Loi Road
Pit WPR1	TBM pipe jacking
Velodrome
Pit L – Pit M	Pipe cleaning and connection
Pit M to Pit N	Hydrostatic pressure testing for completed pipe
Po Lam Road
PLR South	Trench backfilling and reinstatement
Location A	Pipe cap construction and trench excavation and pipe laying
B3	Carriageway reinstatement
Tsui Lam Road
Locaation B	Construction of pile cap, ELS, and excavation for cap construction
TKO Primary Service Reservoir
--	Pipe cleaning and CCTV survey

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 Environmental Licence, Notification and Permit

Reference No.	Valid Period		Remark
Reference No.	From	To	Remark
Variation of Environmental Permit
EP no.: EP-503/2015/A	--	--	N/A
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation
423775	--	--	N/A
Chemical Waste Producer Registration
5213-839-P3287-01	--	--	N/A
Billing Account for Disposal of Construction Waste
A/C no.: 7029491	--	--	N/A
Water Discharge Licence
WT00032336-2018	10 Dec 2018	31 Dec 2023	N/A
Construction Noise Permit
GW-RE0330-22	14 Apr 2022	1 Oct 2022	Hong Kong Velodrome
GW-RE0326-22	19 Apr 2022	1 Oct 2022	Wan Po Road near Wan O Road and Chun Yat Street
GW-RE0329-22	19 Apr 2022	1 Oct 2022	Shek Kok Road near Shrewsbury International School Hong Kong,
GW-RE0353-22	14 Apr 2022	1 Oct 2022	Wan Po Road near Chun Ying Street,
GW-RE0706-22	21 Jul 2022	20 Oct 2022	Wan Po Road near Chun Wang Street

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.

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 1, 7, 17, 23 and 29 September 2022 as construction works were conducted within 300m to the noise sensitive receiver. Detailed monitoring results can be found in Appendix G.

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 was 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	Expiry Date
Sound Level Meter	Svantek 971	96062	27/06/2022	26/06/2023
Sound Level Meter Calibrator	RION NC-75	34524163	09/05/2022	08/05/2023
Pocket Wind Meter Anemometer	Kestrel 1000 Wind Meter	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 1, 7, 17, 23 and 29 September 2022. Detailed monitoring results are presented in Appendix G.

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

No action and limit level exceedance was recorded for construction noise monitoring during the reporting period.

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/cardboard (in ‘000kg)	Plastics (in ‘000kg)	Metals (in ‘000kg)
Sep 2022	1.886	0.000	0.004	0.056	0.000	0.000

4. Landfill gas monitoring

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.

Monitoring Location

Monitoring of oxygen, methane, carbon dioxide and barometric pressure was performed for excavations at 1m depth or more within the Consultation Zone.

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 4.9.

Figure 4.1 Monitoring Location - CH.A 6+70

Figure 4.2 Monitoring Location – CH.A 13+50 ~ 14+00 (Pit A)

Figure 4.3 Monitoring Location – Jacking Pit D

Figure 4.4 Monitoring Location – Pit 137A (137 Pit A)

Figure 4.5 Monitoring Location – Pit 137B (137 Pit B)

Figure 4.6 Monitoring Location – Pit 137C (137 Pit C)

Figure 4.7 Monitoring Location – Wan Po Road 4

Figure 4.8 Monitoring Location – Wan Po Road 5

Diagram

Description automatically generated

Figure 4.9 Monitoring Location –CH.CA 0+00 to CH.CA 04+25 (CH.C 7+40 ~ 12+00)

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.

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

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 2023
Portable Gas Detector	XT-XWHM-Y-OR	2 September 2023
CO2 Analyzer	TES, 1307H	14 November 2022

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 600 times. All the measured results were presented in Appendix J and were within the Action and Limit Levels.

5. Summary of 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 1, 7, 17, 23 and 29 September 2022 as construction works were conducted within 300m to the noise sensitive receiver. Detailed monitoring results can be found in Appendix G.

Landfill gas monitoring was carried out by the Registered Safety Officer of the Contractor at the excavation locations and within the consultation zones for 600 times. All the measured results were presented in Appendix J and were within the Action and Limit Levels.

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

No environmental complaint, 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 1, 8, 16, 22 and 27 September 2022 at the site portions list in Table 6.1 below. One joint site inspection with IEC was carried out on 27 September 2022.

Table 6.1 Site Inspection Record

Date	Inspected Site Portion	Time
1 September 2022	Portion J	09:30 – 10:45
8 September 2022	Portion J	09:30 – 11:00
16 September 2022	Portion J	09:30 – 11:30
22 September 2022	Portion J	09:30 – 10:30
27 September 2022	Portion J	14:15 – 14:45

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
1 September 2022	1. Drip tray should be provided for chemical storage. (Pit D) 2. Muddy surface runoff should be collected and treated properly and avoid runoff to nearby gully. (Pit D) 3. Gully should be protected and covered properly to avoid muddy water discharge into gully. (Pit D)	1. Chemical was removed. 2. Surface runoff was collected and treated properly. 3. Gully covered properly.
8 September 2022	1. Pit 2 and 6 the water drains along the construction site shall be blocked or cover with sandbags to avoid any polluted water into the storm drain. 2. There are no sedimentation tanks available on site, the contractors are required to modify as soon as possible, no discharge are allowed. 3. There are general refuses found along the site Pit 2 and 3, the contractor shall provide sufficient garbage containers and clean up / remove the refuses immediately. 4. There are chemicals found in Pit 2 placed on the ground, the chemicals shall be stored properly (i.e., drip tray)	1. Water drains along the construction site was surrounded by sandbags to avoid polluted water into the storm drain. 2. Sedimentation tank was deployed on site, all wastewater was treated before discharge. 3. General refuse was removed. 4. Chemicals were removed.
16 September 2022	1. Drip tray shall be provided for chemical storage. (Pit D) 2. Wastewater should be treated with wastewater treatment facility before discharge. (TKO Area 137 Pit C) 3. Muddy surface runoff should be collected and treated properly and avoid runoff to nearby gully. (Pit D)	1. Chemical was removed. 2. Wastewater treatment facility was deployed on site. 3. Surface runoff was collected and treated properly.
22 September 2022	1. Drip tray should be provided for chemical storage. (Location B, Pit X) 2. Construction materials should be removed inside the tree protection zone. (Location B)	1. Chemical was removed. 2. Construction materials were removed from the tree protection zone.
27 September 2022	1. Drip tray should be provided for chemical storage. (Creative School)	1. Chemical was removed.

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	Construction Works to be undertaken in the next Reporting Month
TKO Area 137
Pit A	Pipe trench excavation and pipe laying
Pit B	Pipe laying
Pit C	Pipe trench excavation and pipe laying
Wan Po Road
Workfront 1	Pipe trench excavation and pipe laying
Workfront 2	Pipe trench excavation and pipe laying
Workfront 3	Carriageway reinstatement
Workfront 4A – 4B	Pipe laying inside hand-shield tunnel
Workfront 5	Pipe trench excavation and pipe laying
Workfront 6	Pipe trench excavation, pipe laying and construction of Pit A0
Pit A	Hand-shield excavation between Pit A to Pit A0
Junction of Wan O Road	Pipe trench excavation and pipe laying
Central divider near Lohas Park	Backfilling & reinstatement of central divider
Pit C1	Construction of concrete bend block and Pit C1
Shek Kok Road
Pit D1	Pipe trench excavation and pipe laying
Roundabout	Trench backfilling and reinstatement
Pit D	Backfilling and reinstate Pit D
Lohas Park Hand-shield	Ground treatment works
Landfill Stage 1
Area A	Hydrostatic pressure testing for the completed pipe
Creative School
--	Trench excavation and pipe laying
Pung Loi Road
Pit WPR1	TBM pipe jacking
Roundabout - Pit J1A	Trench excavation and pipe laying
Velodrome
Pit L – Pit M	Casting pipe concrete thrust block and reinstalment
Pit M to Pit N	Pipe cleaning and CCTV survey
Po Lam Road
PLR South	Pipe cleaning and Hydrostatic pressure testing for the completed pipe
Location A	Trench excavation and pipe laying
Tsui Lam Road
Locaation B	ELS and excavation for cap construction
TKO Primary Service Reservoir
--	Hydrostatic pressure testing for the completed pipe

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.

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

8. Conclusion and Recommendations

This is the 50^th monthly Environmental Monitoring and Audit (EM&A) Report presenting the EM&A works undertaken during the period from 1 September to 30 September 2022 in accordance with the EM&A Manual and the requirement under EP-503/2015/A.

Impact monitoring for noise impact was scheduled in the reporting month for NSR4 – Creative Secondary School on 1, 7, 17, 23 and 29 September 2022 as construction works were conducted within 300m to the noise sensitive received. No action and limit level exceedance for construction noise monitoring was recorded in the reporting period.

No exceedance of the action and limit level for landfill gas monitoring was recorded during the reporting period.

Weekly environmental site inspections were conducted during the reporting month. 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, and proper materials storage.

No environmental complaint, notification of summons and prosecution was received in the reporting month.

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

Rev.	Description of Modification	Date
0	1^st Submission	20/10/2022
1	Revised according to IEC’s comment	28/10/2022

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