The SENT Landfill Extension (SENTX) forms an integral part in the Strategic Plan in maintaining the continuity of landfill capacity in the Hong Kong for the cost-effective and environmentally satisfactory disposal of waste. ERM-Hong Kong, Limited (ERM) is commissioned to undertake the role of Environmental Team (ET) for the construction, operation/restoration and aftercare of SENTX Project (“the Project”) in accordance with the requirements specified in the Environmental Permit (EP), updated Environmental Monitoring and Audit (EM&A) Manual, the approved Environmental Impact Assessment (EIA) Report of the Project taking account of the latest design and other relevant statutory requirements. The construction (not including works related to site clearance and preparation) and operation of the Project commenced on 2 January 2019 and 21 November 2021, respectively.

This Annual EM&A Report presents the EM&A works carried out during the period from 1 January to 31 December 2021 for the Project in accordance with the updated EM&A Manual.

Exceedance of Action and Limit Levels for Air Quality

One exceedance of the Limit Level for Total Suspended Particulates (TSP) and one exceedance of the Limit Level for landfill gas flare stack emission (Carbon Monoxide (CO)) were recorded for air quality impact monitoring in the reporting period. The TSP exceedance at AM4 on 13 December 2021 was considered non Project-related upon further investigation. The landfill gas flare stack emission (CO) exceedance on 17 December 2021 was found to be Project-related.

Exceedance of Action and Limit Levels for Noise

No exceedance of Action and Limit Levels for construction and operation/ restoration phase noise monitoring was recorded in the reporting period.

Exceedance of Action and Limit Levels for Water Quality

Five exceedances of the Limit Level for pH, four exceedances of the Limit Level for suspended solids (SS) and one exceedance of the Limit Level for dissolved oxygen (DO) were recorded for surface water quality impact monitoring in the reporting period. The DO, pH and SS exceedances were found deemed to Project-related activities.

One exceedance of the Limit Level for groundwater (Chemical Oxygen Demand (COD)) was recorded for water quality impact monitoring in the reporting period. The groundwater (COD) exceedance at MWX-6 on 8 December 2021 was considered non Project-related upon further investigation.

Exceedance of Action and Limit Levels for Landfill Gas

No exceedance of Action and Limit Levels for operation/ restoration phase landfill gas monitoring was recorded in the reporting period.

Environmental Complaints, Summons and Prosecutions

There were no complaints, notification of summons or prosecution recorded in the reporting period.

Reporting Change

There was no reporting change in the reporting period.

1 Introduction

1.1 Background

The SENT Landfill Extension (SENTX) forms an integral part in the Strategic Plan in maintaining the continuity of landfill capacity in the Hong Kong for the cost-effective and environmentally satisfactory disposal of waste. The Environmental Impact Assessment (EIA) Report and the associated Environmental Monitoring and Audit (EM&A) Manual for the construction, operation, restoration and aftercare of the SENTX (hereafter referred to as “the Project”) have been approved under the Environmental Impact Assessment Ordinance (EIAO) in May 2008 (Register No.: AEIAR-117/2008) (hereafter referred to as the approved EIA Report) and an Environmental Permit (EP-308/2008) (EP) was granted by the Director of Environmental Protection (DEP) on 5 August 2008.

Since then, applications for Variation of an Environmental Permit (No. VEP-531/2017) were submitted to EPD and the Variation of Environmental Permits (EP-308/2008/A and EP-308/2008/B) were granted on 6 January 2012 and 20 January 2017, respectively, as the Hong Kong SAR Government has decided to reduce the scale of the design scheme of SENTX assessed in the approved EIA Report and SENTX will only receive construction waste. In May 2018, a Further Environmental Permit (FEP) (FEP-01/308/2008/B) was granted to the SENTX’s contractor, Green Valley Landfill, Limited (GVL).

ERM-Hong Kong, Limited (ERM) and Meinhardt Infrastructure and Environment Limited (Meinhardt) are commissioned to undertake the roles of Environmental Team (ET) and the Independent Environmental Checker (IEC), respectively, to undertake the EM&A activities for the Project in accordance with the requirements specified in the EP, updated EM&A Manual ([1]), approved EIA Report ([2]) taking account of the latest design and other relevant statutory requirements.

1.2 Project Description

The SENTX is a piggyback landfill, occupying the southern part of the existing SENT Landfill (including its infrastructure area) and 13 ha of Tseung Kwan O (TKO) Area 137. A layout plan of the SENTX is shown in Figure 1.1. Under the latest design, the SENTX has a net void capacity of about 6.5 Mm³ and provides an additional lifespan of about 6 years, commencing operation upon exhaustion of the SENT Landfill. The SENTX will receive construction waste only.

The key implementation milestones of the Project are indicatively summarised in Table 1.1. The construction works and operation of the Project commenced on 2 January 2019 and 21 November 2021, respectively.

Table 1.1 Estimated Key Dates of Implementation Programme

Key Stage of the Project	Indicative Date
Start construction	2 January 2019
Commissioning of new infrastructure facilities	2020
Demolition of existing infrastructure facilities	2021
Start waste intake at SENTX	21 November 2021
Estimated exhaustion date of SENTX	2027
End of aftercare for SENTX	2057

The major construction works of the SENTX includes:

· Site formation at the TKO Area 137 and the existing infrastructure area at SENT Landfill;

· Construction of surface and groundwater drainage systems;

· Construction of the leachate containment and collection systems;

· Construction of new leachate and landfill gas treatment facilities, site offices, maintenance yards at the new infrastructure area;

· Construction of new pipelines to transfer the leachate and landfill gas collected from the existing SENT Landfill to the treatment facilities at the new infrastructure area;

· Construction of the site access and new waste reception facilities; and

· Demolition of the facilities at the existing SENT Landfill infrastructure area.

1.3 Scope of the EM&A Report

This is the Annual EM&A Report for the Project which summarises the key findings of the EM&A programme during the reporting period from 1 January to 31 December 2021 for the construction and operation works.

1.4 Project Organisation

The organisation structure of the Project is presented in Figure 1.2.

Figure 1.2 Organisation Chart

Contact details of the key personnel are summarized in Table 1.2 below.

Table 1.2 Contact Information of Key Personnel

Party	Position	Name	Telephone
Contractor (Green Valley Landfill Limited)	Project Manager	Gary Barnicott	2706 8827
Contractor (Green Valley Landfill Limited)
Environmental Team (ET) (ERM-Hong Kong, Limited)	ET Leader	Frank Wan	2271 3152
Independent Environmental Checker (IEC) (Meinhardt Infrastructure and Environment Limited)	IEC	W.K. Chiu	2858 0738

1.5 Summary of Construction Works

The programme of the construction is shown in Annex A. As informed by the Contractor, the major works carried out in this reporting period include:

January 2021

· Installation of cables and cable containment at Leachate Treatment Plant (LTP) area;

· Electro-mechanical installation (including pipe) at LTP area;

· Testing and commissioning at LTP;

· Building services works and fitting-out works for infrastructure buildings (EPD building, GVL building and laboratory building);

· Steel members and cladding installation for superstructure of maintenance building;

· Equipment installation for fire services tank room;

· Water main pipe installation for infrastructure buildings;

· Road pavement for the emergency vehicular access (EVA);

· Filling works at the West of Cell 3X;

· Maintenance and improvement of temporary surface water drainage;

· Construction of Cell 3X formation;

· Liner installation at Cell 3X;

· Road pavement for EVA along Western Bund from main entrance;

· Installation of steel members for vehicle washing facilities;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

February 2021

· Testing and commissioning at LTP;

· Building services works and fitting-out works for infrastructure buildings (EPD building, GVL building and laboratory building);

· Cladding installation for maintenance building;

· Equipment installation for fire services tank room;

· Road pavement for carpark and EVA;

· Maintenance and improvement of temporary surface water drainage;

· Liner installation at Cell 3X;

· Installation of steel members for vehicle washing facilities;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

March 2021

· Functional testing at LTP;

· Building services works and fitting-out works for infrastructure buildings (EPD building, GVL building and laboratory building);

· Cladding installation for superstructure of maintenance building;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

April 2021

· Follow up on civil provision work detects at Landfill Gas (LFG) Plant and LTP and infrastructure area;

· Automation system testing at LTP;

· Testing and commissioning at LTP;

· Construction of U-channel surface drainage at infrastructure area;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

May 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Testing and commissioning at LFG Plant and LTP;

· Construction of U-channel surface drainage at infrastructure area;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Construction of the structure of Weighmaster House and Guard House;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

June 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Testing and commissioning at LFG Plant and LTP;

· Construction of U-channel surface drainage at infrastructure area;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Demolition of the SENT infrastructure buildings;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

July 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Construction of U-channel surface drainage at infrastructure area;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Demolition of the SENT infrastructure buildings;

· Installation of weighbridge steel platform;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

August 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Construction of U-channel surface drainage at infrastructure area;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Construction of MSE wall;

· Maintenance and improvement of temporary surface water drainage;

· Demolition of the SENT infrastructure buildings;

· Installation of weighbridge steel platform; and

· Underground utilities and pipes installation at waste reception area.

September 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Construction of screeding at LTP;

· Road pavement for EVA;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Construction of MSE wall and Cell 4X formation;

· Maintenance and improvement of temporary surface water drainage;

· Demolition and debris removal of the SENT infrastructure buildings;

· Installation of weighbridge steel platform;

· Underground utilities and pipes installation at waste reception area; and

· Sewerage system works at waste reception area.

October 2021

· Follow up on civil provision work detects at LFG Plant, LTP and infrastructure area;

· Construction of screeding at LTP;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Construction of mechanically stabilised earth (MSE) wall and Cell 4X formation;

· Maintenance and improvement of temporary surface water drainage; and

· Underground utilities and pipes installation at waste reception area.

November 2021

· Follow up on civil provision work detects at LFG Plant, LTP, infrastructure area and waste reception area;

· Construction of screeding at LTP;

· Permanent equipment installation for sump houses 1, 2 and 3;

· Maintenance and improvement of temporary surface water drainage;

· Demolition of SENT infrastructure buildings; and

· Liner works at Cell 4X.

December 2021

· Follow up on civil provision work defects at LFG Plant, LTP, infrastructure area and waste reception area;

· Construction of MSE wall;

· Site formation for Cell 4X;

· Liner works at Cell 4X; and

· Maintenance and improvement of temporary surface water drainage.

The implementation schedule of the mitigation measures recommended in the Updated EM&A Manual is presented in Annex B.

1.6 Summary of EM&A Programme Requirements

The status for all environmental aspects are presented in Table 1.3. The EM&A requirements remained unchanged during the reporting period.

Table 1.3 Summary of Status for the Environmental Aspects under the Updated EM&A Manual

Parameters	Status
Air Quality
Baseline Monitoring	The results of baseline air quality monitoring were reported in Baseline Monitoring Report and Pre-operation Baseline Monitoring Report and submitted to EPD under EP Condition 3.3
Impact Monitoring	On-going
Noise
Baseline Monitoring	The results of baseline noise monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3
Impact Monitoring	On-going
Water Quality
Baseline Monitoring	The results of baseline water quality monitoring were reported in Baseline Monitoring Report and Pre-operation Baseline Monitoring Report and submitted to EPD under EP Condition 3.3
Impact Monitoring	On-going
Landfill Gas
Baseline Monitoring	The results of baseline landfill gas monitoring were reported in Pre-operation Baseline Monitoring Report and submitted to EPD under EP Condition 3.3
Impact Monitoring	On-going
Waste Management
Waste Monitoring	On-going
Landscape and Visual
Baseline Monitoring	The results of baseline landscape and visual monitoring were reported in Baseline Monitoring Report and submitted to EPD under EP Condition 3.3
Construction Phase Audit	On-going
Site Environmental Audit
Regular Site Inspection	On-going
Complaint Hotline and Email Channel	On-going
Environmental Log Book	On-going

Taking into account the construction/operation works, impact monitoring of air quality, noise, water quality, landfill gas and waste management were carried out in the reporting period. The impact monitoring schedule of air quality, noise, water quality and landfill gas monitoring are provided in Annex C.

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. To promote the environmental awareness and enhance the environmental performance of the contractors, environmental trainings and regular environmental management meetings were conducted during the reporting period, which are summarised as below:

Ÿ Twelve environmental management meetings were held with the Contractor, ER, ET, IEC and EPD on 21 January, 18 February, 18 March, 8 April, 20 May, 24 June, 22 July, 26 August, 23 September, 21 October, 26 November and 16 December 2021; and

Ÿ Environmental toolbox trainings on the following topics were provided by the Contractor to the workers:

Ÿ Illegal Dumping on 11 January 2021;

Ÿ Trip Ticket System on 22 January 2021;

Ÿ Cut Down Construction Dust on 8 February 2021;

Ÿ Wastewater Management on 22 February 2021;

Ÿ Clean Recycling on 12 March 2021;

Ÿ Mosquito Nuisance on 16 March 2021;

Ÿ Quality Powered Mechanical Equipment on 16 April 2021;

Ÿ Handling of Chemical Wastes on 21 April 2021;

Ÿ Tree Protection Zone on 13 May 2021;

Ÿ Renewable Energy on 20 May 2021;

Ÿ Noise Control Ordinance on 9 June 2021;

Ÿ Waste Reduction in Construction Site on 23 June 2021;

Ÿ Mosquito Control on 7 July 2021;

Ÿ Good Vehicle Maintenance Practice on 21 July 2021;

Ÿ Dark Smoke on 12 August 2021;

Ÿ VOC and Smog on 19 August 2021;

Ÿ Indoor Air Quality on 9 September 2021;

Ÿ Persistent Organic Pollutants on 23 September 2021;

Ÿ Cut Down Construction Dust on 6 October 2021;

Ÿ Waste Water Management on 20 October 2021;

Ÿ Trip Ticket System on 10 November 2021;

Ÿ Illegal Dumping on 23 November 2021;

Ÿ Noise Control Ordinance on 8 December 2021; and

Ÿ Air Pollution Control (NRMM) Regulation on 22 December 2021.

1.7 Status of Statutory Environmental Compliance with the Environmental Permit

The status of statutory environmental compliance with the EP conditions under the EIAO, submission status under the EP and implementation status of the recommended mitigation measures are presented in Table 1.4.

Table 1.4 Status of Submissions required under the EP and Implementation Status of the recommended Mitigation Measures

EP Condition	Submission / Implementation Status	Status
2.3	Management Organisation of Main Construction Companies	Submitted and accepted by EPD.
2.4	Setting up of Community Liaison Group	Community Liaison Group was set up.
2.5	Submission of Detailed Landfill Gas Hazard Assessment Report	Submitted, and accepted by EPD on 10 January 2019.
2.6	Submission of Restoration and Ecological Enhancement Plan	Submitted to EPD on 28 June 2019.
2.7	Setting up of Trial Nursery	Trial Nursery works was commenced on 28 August 2019.
2.8	Advance Screen Planting	Advance Screen Planting works were completed on 28 June 2019.
2.9	Provision of Multi-layer Composite Liner System	Under implementation.

1.8 Status of Other Statutory Environmental Requirements

The environmental licenses and permits (including EP, Water Pollution Control Ordinance (WPCO) discharge license, registration as a chemical waste producer, and construction noise permit) that are valid in the reporting period are presented in Table 1.5. No non-compliance with environmental statutory requirements was identified.

Table 1.5 Status of Statutory Environmental Requirements

Description	Ref No.	Status
Environmental Permit	EP-308/2008	Granted on 5 August 2008
Variation of Environmental Permit	EP-308/2008/A	Granted on 6 January 2012
Variation of Environmental Permit	EP-308/2008/B	Granted on 20 January 2017
Further Environmental Permit	FEP-01/308/2008/B	Granted on 16 May 2018
Water Discharge License under WPCO (Permit Holder: Chun Wo)	Licence No.: WT00033525-2019	Validity from 27 March 2019 to 31 March 2024
Water Discharge License under WPCO (Permit Holder: GVL)	Licence No.: WT00036269-2020	Validity from 21 June 2020 to 30 June 2022
Billing Account for Disposal of Construction Waste	Chit Account Number: 5001692	Approved on 28 December 2005
Registration as a Chemical Waste Producer (Permit Holder: Chun Wo)	5213-839-C3507-10	Issued on 23 August 2018
Registration as a Chemical Waste Producer (Permit Holder: REC)	5518-839-R2289-06	Issued on 24 October 2019
Construction Noise Permit (Permit Holder: GVL)	GW-RE0542-20	Validity from 1 September 2020 to 28 February 2021
	GW-RE0154-21	Validity from 1 March 2021 to 30 September 2021
	GW-RE0990-21	Validity from 6 October 2021 to 5 April 2022
Construction Noise Permit (Permit Holder: Chun Wo)	GW-RE1047-20	Validity from 9 December 2020 to 7 June 2021
	GW-RE0564-21	Validity from 7 June 2021 to 6 December 2021
Construction Noise Permit (Permit Holder: REC)	GW-RE0889-20	Validity from 1 November 2020 to 31 March 2021
	GW-RE0255-21	Validity from 1 April 2020 to 30 September 2021
Construction Noise Permit (Permit Holder: Paul Y.)	GW-RE1138-21	Validity from 16 November 2021 to 15 February 2022

2 EM&A Results

The EM&A programme for the Project required environmental monitoring for air quality, noise, water quality and landfill gas as well as environmental site inspections for air quality, noise, water quality, landfill gas, waste management, and landscape and visual impacts. The EM&A requirements and related findings for each component are summarised in the following sections.

2.1 Air Quality Monitoring

2.1.1 Dust Monitoring

Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact air quality monitoring (dust, in term of Total Suspended Particulates (TSP)) was carried out at the two designated monitoring locations (i.e. DM1 and DM2) and four designated locations along the site boundary (i.e. AM1, AM2, AM3 and AM4) during the construction and operation/restoration phase, respectively, at a 6-day interval. During the construction phase, as there are two existing TSP monitoring stations (i.e. TKO-A1 and TKO-A2a) currently operating by the Civil Engineering and Development Department (CEDD) to monitor the 24-hour TSP levels at the proposed dust monitoring stations for the SENTX, it is considered that the CEDD monitoring data can represent the dust condition of the SENTX during the construction phase.

The Action and Limit Levels of the air quality monitoring is provided in Table 2.1 below.

Table 2.1 Action and Limit Levels for 24-hour TSP

Monitoring Station	Action Level	Limit Level
Construction Phase:
DM-1 – Site Egress of TKO Area 137 Fill Bank	204 µg m-³	260 µg m-³
DM-2A –Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank	193 µg m-³	260 µg m-³
Operation/ Restoration Phase:
AM1 - SENTX Site Boundary (North)	260 µg m-³	260 µg m-³
AM2 - SENTX Site Boundary (West, near DP3)
AM3 - SENTX Site Boundary (West, near RC15)
AM4 - SENTX Site Boundary (West, near EPD building)

High volume air samplers (HVSs) in compliance with the specifications listed under Section 3.2.2 of the updated EM&A Manual were used to measure 24-hour TSP levels at the CEDD dust monitoring stations. The HVSs were calibrated upon installation and thereafter at bi-monthly intervals to check the validity and accuracy of the results.

The equipment used in the impact air quality monitoring programme and monitoring locations are summarised in Table 2.2 and illustrated in Figure 2.1 respectively.

Table 2.2 Dust Monitoring Details

Monitoring Station	Location	Parameter	Frequency and Duration	Monitoring Dates	Equipment
Construction Phase
DM1	Site Egress of TKO Area 137 Fill Bank	24-hour TSP	Once every 6 days	5, 11, 17, 23, 29 January 2021 4, 10, 16, 22, 28 February 2021 6, 12, 18, 24, 30 March 2021 1, 7, 13, 19, 25 April 2021 6, 12, 18, 24, 30 May 2021 5, 11, 17, 23, 29 June 2021 5, 11, 17, 23, 29 July 2021 4, 10, 16, 22, 28 August 2021 3, 9, 15, 21, 27 September 2021 3, 11, 15, 21, 27 October 2021 2, 8, 14, 20 November 2021	HVS Greasby 105 (S/N: 9795 (ET/EA/003/18))
DM2	Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank	24-hour TSP	Once every 6 days		HVS Andersen G1051 (S/N: 1176 (ET/EA/003/05))
Operation/ Restoration Phase
AM1	SENTX Site Boundary (North)	24-hour TSP	Once every 6 days	25 November 2021 1, 7, 13, 19, 25, 31 December 2021	Tisch TE-5170 (S/N: 1190)
AM2	SENTX Site Boundary (West, near DP3)				Tisch TE-5170 (S/N: 1047)
AM3	SENTX Site Boundary (West, near RC15)				Tisch TE-5170 (S/N: 1258)
AM4	SENTX Site Boundary (West, near EPD building)				Tisch TE-5170 (S/N: 1101)

Monitoring Schedule for the Reporting Period

The schedule for air quality monitoring during the reporting period is provided in Annex C.

Results and Observations

The 24-hour TSP monitoring results are summarised in Table 2.3. The detailed monitoring results and the graphical presentation of the 24-hour TSP monitoring results at each monitoring location are provided in Annex D1.

Table 2.3 Summary of 24-hour TSP Monitoring Results in the Reporting Period

Month	Monitoring Station	24-hr TSP Concentration (µg m^-3)		Action Level (µg/m³)	Limit Level (µg/m³)
Month	Monitoring Station	Average	Range	Action Level (µg/m³)	Limit Level (µg/m³)
Construction Phase
January 2021	DM-1	111	105 - 117	204	260
January 2021	DM-2	104	95 – 115	193	260
February 2021	DM-1	104	92 - 113	204	260
February 2021	DM-2	98	89 – 103	193	260
March 2021	DM-1	104	90 - 115	204	260
March 2021	DM-2	100	93 - 109	193	260
April 2021	DM-1	107	98 - 115	204	260
April 2021	DM-2	97	89 - 107	193	260
May 2021	DM-1	106	99 - 115	204	260
May 2021	DM-2	97	91 - 104	193	260
June 2021	DM-1	106	97 - 114	204	260
June 2021	DM-2	97	88 - 106	193	260
July 2021	DM-1	105	97 – 111	204	260
July 2021	DM-2	97	89 - 107	193	260
August 2021	DM-1	100	89 - 113	204	260
August 2021	DM-2	92	78 - 105	193	260
September 2021	DM-1	106	95 - 120	204	260
September 2021	DM-2	99	91 - 111	193	260
October 2021	DM-1	98	92 – 112	204	260
October 2021	DM-2	92	86 - 104	193	260
November 2021	DM-1	101	94 - 109	204	260
November 2021	DM-2	91	86 - 197	193	260
Operation/ Restoration Phase
November 2021	AM1	100	-	260	260
	AM2	154	-	260	260
	AM3	158	-	260	260
	AM4	235	-	260	260
December 2021	AM1	112	57 – 173	260	260
	AM2	129	100 - 156	260	260
	AM3	182	128 - 258	260	260
	AM4	168	102 - 282	260	260

The major dust sources in the reporting period included fugitive dust emission from exposed area in SENTX, as well as nearby operations of the SENT landfill and the TKO Area 137 Fill Bank.

Action and Limit Levels exceedance was recorded for TSP monitoring in the reporting period and actions in accordance with the Event and Action Plan presented in Annex D2 were undertaken. Investigation of the Action and Limit Levels exceedance was conducted and the investigation report is presented in Annex D6.

Based on the investigation conducted for the monitoring event with potential Action and Limit Levels exceedance with the Contractor and the IEC, the TSP exceedance at AM4 on 13 December 2021 was considered non Project-related. The Contractor was reminded to implement all relevant mitigation measures for the construction and operation works and maintain good site practice. The ET will keep track on the monitoring data and ensure Contractor’s compliance of the environmental requirements.

Meteorological Data

Meteorological data obtained from the SENTX on-site meteorological monitoring station was used for the dust monitoring and is shown in Annex D3. It is considered that meteorological data obtained at the on-site meteorological monitoring station is representative of the Project area and could be used for the construction/operation phase dust monitoring programme for the Project.

2.1.2 Odour Monitoring

Monitoring Requirements

According to the updated EM&A Manual of the Project, odour patrol was carried out along the site boundary during the operation/ restoration phase. During the first month of operation, daily odour patrol (3 times per day) was conducted jointly by the ET and the IEC. The odour intensity detected was based on that determined by the IEC. In addition, an independent party (ALS Technichem (HK) Pty Ltd.) was appointed to undertake odour patrol together with the ET and IEC three times per week. During these patrols, the odour intensity detected was based on that determined by the independent third party.

The Action and Limit Levels for odour patrol is provided in Table 2.4 below.

Table 2.4 Action and Limit Levels for Odour Patrol

Parameter	Action Level	Limit Level
Perceived odour intensity and odour complaints	· Odour intensity ≥ Class 2 recorded; or · One documented complaint received	· Odour intensity ≥ Class 3 recorded on 2 consecutive patrol ^{(a) (b)}
Notes: (a) i.e. either Class 3-strong or Class 4-extreme odour intensity. (b) The exceedances of the odour intensity do not need to be recorded at the same location.

Parameter

Action Level

Limit Level

Perceived odour intensity and odour complaints

· Odour intensity ≥ Class 2 recorded; or

· One documented complaint received

· Odour intensity ≥ Class 3 recorded on 2 consecutive patrol ^{(a) (b)}

Notes:

(a) i.e. either Class 3-strong or Class 4-extreme odour intensity.

(b) The exceedances of the odour intensity do not need to be recorded at the same location.

Odour patrol was conducted by trained personnel / competent persons with a specific sensitivity to a reference odour (i.e. on reference materials n-butanol with the concentration of 50ppm in nitrogen (v/v)) in compliance with Section 3.7.2 of the updated EM&A Manual patrolling and sniffing along the SENTX Site boundary to detect any odour.

The odour monitoring programme and patrol route are summarised in Table 2.5 and illustrated in Figure 2.2 respectively.

Table 2.5 Odour Monitoring Details

Patrol Locations	Parameters	Patrol Frequency ^(a)	Monitoring Dates and Time
Patrol along the SENTX Site Boundary (Checkpoints OP1 – OP11 ^(d))	Odour Intensity (see Table 2.6)	Period 1 - First month of operation Daily, three times a day in the morning, afternoon and evening/night (between 18:00 and 22:00 hrs) conducted by the ET and the IEC Three times per week on different days conducted by an independent third party together with the ET and IEC ^(b) Period 2 - Three months following period 1 ^(c) Weekly conducted by the ET and the IEC Once every two weeks conducted by an independent third party together with the ET and IEC ^(b) Period 3 - Throughout operation following period 2 ^(c) Monthly conducted by the ET and the IEC Quarterly conducted by an independent third party together with the ET and IEC ^(b)	Conducted by ET & IEC: 21 – 30 Nov 2021, 1 – 31 Dec 2021 (10:30 – 12:00, 14:30 – 16:00, 18:00 – 19:30) Conducted by an independent third party, ET & IEC: 22 Nov 2021 (14:30 – 16:00), 24 Nov 2021 (10:00 – 12:00), 26 Nov 2021 (14:30 – 16:00), 29 Nov 2021 (14:30 – 16:00), 1 Dec 2021 (14:30 – 16:00), 3 Dec 2021 (10:00 – 12:00), 6 Dec 2021 (14:30 – 16:00), 8 Dec 2021 (10:00 – 12:00), 10 Dec 2021 (10:00 – 12:00), 13 Dec 2021 (10:00 – 12:00), 15 Dec 2021 (10:00 – 12:00), 17 Dec 2021 (14:30 – 16:00), 20 Dec 2021 (10:00 – 12:00), 22 Dec 2021 (14:30 – 16:00), 24 Dec 2021 (14:30 – 16:00), 28 Dec 2021 (14:30 – 16:00), 29 Dec 2021 (10:00 – 12:00), 31 Dec 2021 (14:30 – 16:00)
Notes: (a) Reduction of monitoring frequency will be subject to the monitoring results to demonstrate environmentally acceptable performance. (b) Patrol shall be scheduled so that they are carried out together with the patrols to be carried out jointly by the ET and the IEC. (c) Commencement of each period will be justified by the ET Leader and verified by the IEC and will be subject to agreement with the EPD (EIAO Authority) and Project Proponent. (d) The revised odour patrol route with the addition of checkpoint OP11 was applied from 10 December 2021.

Patrol Locations

Parameters

Patrol Frequency ^(a)

Monitoring Dates and Time

Patrol along the SENTX Site Boundary (Checkpoints OP1 – OP11 ^(d))

Odour Intensity (see Table 2.6)

Period 1 - First month of operation

Daily, three times a day in the morning, afternoon and evening/night (between 18:00 and 22:00 hrs) conducted by the ET and the IEC

Three times per week on different days conducted by an independent third party together with the ET and IEC ^(b)

Period 2 - Three months following period 1 ^(c)

Weekly conducted by the ET and the IEC

Once every two weeks conducted by an independent third party together with the ET and IEC ^(b)

Period 3 - Throughout operation following period 2 ^(c)

Monthly conducted by the ET and the IEC

Quarterly conducted by an independent third party together with the ET and IEC ^(b)

Conducted by ET & IEC:

21 – 30 Nov 2021,

1 – 31 Dec 2021

(10:30 – 12:00, 14:30 – 16:00, 18:00 – 19:30)

Conducted by an independent third party, ET & IEC:

22 Nov 2021 (14:30 – 16:00), 24 Nov 2021 (10:00 – 12:00), 26 Nov 2021 (14:30 – 16:00), 29 Nov 2021 (14:30 – 16:00), 1 Dec 2021 (14:30 – 16:00), 3 Dec 2021 (10:00 – 12:00), 6 Dec 2021 (14:30 – 16:00), 8 Dec 2021 (10:00 – 12:00), 10 Dec 2021 (10:00 – 12:00), 13 Dec 2021 (10:00 – 12:00), 15 Dec 2021 (10:00 – 12:00), 17 Dec 2021 (14:30 – 16:00), 20 Dec 2021 (10:00 – 12:00), 22 Dec 2021 (14:30 – 16:00), 24 Dec 2021 (14:30 – 16:00), 28 Dec 2021 (14:30 – 16:00), 29 Dec 2021 (10:00 – 12:00), 31 Dec 2021 (14:30 – 16:00)

Notes:

(a) Reduction of monitoring frequency will be subject to the monitoring results to demonstrate environmentally acceptable performance.

(b) Patrol shall be scheduled so that they are carried out together with the patrols to be carried out jointly by the ET and the IEC.

(c) Commencement of each period will be justified by the ET Leader and verified by the IEC and will be subject to agreement with the EPD (EIAO Authority) and Project Proponent.

(d) The revised odour patrol route with the addition of checkpoint OP11 was applied from 10 December 2021.

Table 2.6 Odour Intensity Level

Class	Odour Intensity	Description
0	Not Detected	No odour perceived or an odour so weak that it cannot be easily characterised or described.
1	Slight	Identified odour, slight
2	Moderate	Identified odour, moderate
3	Strong	Identified odour, strong
4	Extreme	Severe odour

Monitoring Schedule for the Reporting Month

The schedule for odour patrol during the reporting period is provided in Annex C.

Results and Observations

The odour monitoring results are summarised and provided in Table 2.7 and Annex D4, respectively.

Table 2.7 Summary of Odour Monitoring Results in the Reporting Period

Odour Checkpoints	Odour Intensity Class (Range)	Action Level	Limit Level
OP1	0 – 1	Odour intensity ≥ Class 2 recorded	Odour intensity ≥ Class 3 recorded on 2 consecutive patrol
OP2	0 – 1
OP3	0 – 1
OP4	0 – 1
OP5	0 – 1
OP6	0 – 1
OP7	0 – 1
OP8	0 – 1
OP9	0 – 1
OP10	0
OP11	0 – 1

The potential odour sources in the reporting period included the construction works, operation of leachate treatment plant, generator, slurry truck, excavator, vehicles and vegetation at SENTX, as well as nearby operations of the Town Gas Plant.

All the odour monitoring results were below the Action and Limit Levels in the reporting period. No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex D2.

2.1.3 Thermal Oxidiser, Landfill Gas Flare and Landfill Gas Generator Stack Emission Monitoring

Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, the performance of the thermal oxidiser, landfill gas flare and landfill gas generator was monitored when they are in operation. Gas samples were collected from the stack of the thermal oxidizer, landfill gas flare and landfill gas generator for laboratory analysis for NO₂,CO, SO₂, Benzene and Vinyl chloride and in-situ analysis for exhaust gas velocity at monthly interval. The operating conditions of the thermal oxidiser, landfill gas flare and landfill gas generator were also monitored continuously.

The Limit Levels for stack emission of the thermal oxidiser, landfill gas flare and landfill gas generator are provided in Tables 2.8 – 2.10 below.

Table 2.8 Limit Levels for Stack Emission of the Thermal Oxidiser

Parameters	Limit Level
NO₂	1.58 gs^-1
CO	0.53 gs^-1
SO₂	0.07 gs^-1
Benzene	3.01 x 10^-2 gs^-1
Vinyl chloride	2.23 x 10^-3 gs^-1
Gas combustion temperature	850^oC (minimum)
Exhaust gas exit temperature	443K (minimum) ^(a)
Exhaust gas velocity	7.5 ms^-1 (minimum)^(a)
Note: (a) Level under full load condition.

Table 2.9 Limit Levels for Stack Emission of the Landfill Gas Flare

Parameters	Limit Level
NO₂	0.97 gs^-1
CO	2.43 gs^-1
SO₂	0.22 gs^-1
Benzene	4.14 x 10^-4 gs^-1
Vinyl Chloride	2.60 x 10^-4 gs^-1
Gas combustion temperature	815^oC (minimum)
Exhaust gas exit temperature	923 K (minimum) ^(a)
Exhaust gas velocity	9.0 m s^-1 (minimum)^(a)
Note: (a) Level under full load condition.

Table 2.10 Limit Levels for Stack Emission of the Landfill Gas Generator

Parameters	Limit Level
NO₂	1.91 gs^-1
CO	2.48 gs^-1
SO₂	0.528 gs^-1
Benzene	2.47 x 10^-4 gs^-1
Vinyl chloride	1.88 x 10^-5 gs^-1
Gas combustion temperature	450^oC (minimum)
Exhaust gas exit temperature	723K (minimum) ^(a)
Exhaust gas velocity	30.0 ms^-1 (minimum)^(a)
Note: (a) Level under full load condition.

Gas samples were collected from the centroid of the stack with stainless steel sampling probe, into inert sample containers (i.e. Canister and Tedlar Bag) and transferred to ALS Technichem (HK) Pty Ltd. (HOKLAS Registration No. 066) laboratory within 24 hours of collection for direct analysis on a gas chromatography within 48 hours after collection. The flue gas velocity of the gas stream at the exhaust of thermal oxidize was determined by S-Pitot tube during the emission sampling.

The stack emission monitoring programme and monitoring locations are summarised in Table 2.11 and illustrated in Figure 2.1, respectively.

Table 2.11 Thermal Oxidiser, Landfill Gas Flare and Landfill Gas Generator Stack Emission Monitoring Details

Monitoring Location	Parameter	Frequency	Monitoring Date
Stack of Thermal Oxidiser	Laboratory analysis for · NO₂ · CO · SO₂ · Benzene · Vinyl chloride In-situ analysis for · Exhaust gas velocity	Monthly for the first 12 months of operation and thereafter at quarterly intervals	20 Dec 2021
Stack of Thermal Oxidiser	· Gas combustion temperature · Exhaust temperature · Exhaust gas velocity ^(a)	Continuously	1 – 31 Dec 2021
Stack of Landfill Gas Flare	Laboratory analysis for · NO₂ · CO · SO₂ · Benzene · Vinyl chloride In-situ analysis for · Exhaust gas velocity	Monthly for the first 12 months of operation and thereafter at quarterly intervals	17 Dec 2021
Stack of Landfill Gas Flare	· Gas combustion temperature · Exhaust temperature · Exhaust gas velocity ^(a)	Continuously	1 – 31 Dec 2021
Stack of Landfill Gas Generator	Laboratory analysis for · NO₂ · CO · SO₂ · Benzene · Vinyl chloride In-situ analysis for · Exhaust gas velocity	Monthly for the first 12 months of operation and thereafter at quarterly intervals	17 Dec 2021
Stack of Landfill Gas Generator	· Exhaust temperature · Exhaust gas velocity ^(a)	Continuously	1 – 31 Dec 2021
Note: (a) The exhaust gas velocity will be calculated based on the cross-section area of the stack and continuous monitored gas flow and combustion temperature data.

Monitoring Schedule for the Reporting Month

The schedule for thermal oxidizer, landfill gas flare and landfill gas generator stack emission monitoring during the reporting period is provided in Annex C.

Results and Observations

The thermal oxidizer, landfill gas flare and landfill gas generator stack emission monitoring results and detailed continuous monitoring results are summarised in Tables 2.12 - 2.14 and provided in Annex D5, respectively.

Table 2.12 Summary of Thermal Oxidiser Stack Emission Monitoring in the Reporting Period

Parameters	Monitoring Results (Range in Bracket)	Limit Level
NO₂	0.38 gs^-1	1.58 gs^-1
CO	<0.02 gs^-1	0.53 gs^-1
SO₂	<0.01 gs^-1	0.07 gs^-1
Benzene	<2 x 10^-5 gs^-1	3.01 x 10^-2 gs^-1
Vinyl chloride	<2 x 10^-5 gs^-1	2.23 x 10^-3 gs^-1
Gas combustion temperature	943^oC (932^oC - 984^oC)	850^oC (minimum)
Exhaust gas exit temperature	1,237K (1,219K – 1,316K)	443K (minimum) ^(a)
Exhaust gas velocity	15.3^(b)	7.5 ms^-1 (minimum)^(a)
Note: (a) Level under full load condition. (b) The exhaust gas velocity was calculated based on the cross-section area of the stack and the gas flow and combustion temperature data measured during the stack emission monitoring. The limit level was not applicable as the stack was not operated under full load condition.

Table 2.13 Summary of Landfill Gas Flare Stack Emission Monitoring in the Reporting Period

Parameters	Monitoring Results (Range in Bracket)	Limit Level
NO₂	<0.02 gs^-1	0.97 gs^-1
CO	2.81 gs^-1	2.43 gs^-1
SO₂	0.11 gs^-1	0.22 gs^-1
Benzene	9.9 x 10^-5 gs^-1	4.14 x 10^-4 gs^-1
Vinyl chloride	<1.4 x 10^-5 gs^-1	2.60 x 10^-4 gs^-1
Gas combustion temperature	Flare 1: 864^oC (820^oC - 935^oC) Flare 2: 853^oC (820^oC - 894^oC)	815^oC (minimum)
Exhaust gas exit temperature	Flare 1: 1,059K (1,025K – 1,115K) Flare 2: 1,027K (944K – 1,097K)	923 K (minimum) ^(a)
Exhaust gas velocity	9.1^(b)	9.0 m s^-1 (minimum)^(a)
Note: (a) Level under full load condition. (b) The exhaust gas velocity was calculated based on the cross-section area of the stack and the gas flow and combustion temperature data measured during the stack emission monitoring. The limit level was not applicable as the stack was not operated under full load condition.

Table 2.14 Summary of Landfill Gas Generator Stack Emission Monitoring in the Reporting Period

Parameters	Monitoring Results (Range in Bracket)	Limit Level
NO₂	0.007 gs^-1	1.91 gs^-1
CO	0.046 gs^-1	2.48 gs^-1
SO₂	0.074 gs^-1	0.528 gs^-1
Benzene	4 x 10^-6 gs^-1	2.47 x 10^-4 gs^-1
Vinyl chloride	<1.2 x 10^-6 gs^-1	1.88 x 10^-5 gs^-1
Exhaust gas exit temperature	838K (748K – 847K)	723K (minimum) ^(a)
Exhaust gas velocity	17.6^(b)	30.0 ms^-1 (minimum)^(a)
Note: (a) Level under full load condition. (b) The exhaust gas velocity was calculated based on the cross-section area of the stack and the gas flow and combustion temperature data measured during the stack emission monitoring. The limit level was not applicable as the stack was not operated under full load condition.

Limit Levels exceedance was recorded for landfill gas flare stack emission (CO) in the reporting period and actions in accordance with the Event and Action Plan presented in Annex D2 were undertaken. Investigation of the Limit Levels exceedance was conducted and the investigation report is presented in Annex D6.

Based on the investigation conducted for the monitoring event with potential Limit Levels exceedance with the Contractor and the IEC, the landfill gas flare stack emission (CO) exceedance on 17 December 2021 was found to be Project-related. The Contractor was reminded to implement all relevant mitigation measures for the construction and operation works and maintain good site practice. The ET will keep track on the monitoring data and ensure Contractor’s compliance of the environmental requirements.

2.2 Noise Monitoring

2.2.1 Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact noise monitoring was conducted weekly at the monitoring location (i.e. NM1) to obtain one set of 30 minutes measurement between 07:00 and 19:00 hours on normal weekdays.

The Action and Limit Levels for construction and operational noise of the Project are provided in Table 2.15 below.

Table 2.15 Action and Limit Levels for Construction/Operational Noise

Time Period	Action Level ^(a)	Limit Level ^(b)
Construction Noise:
07:00 – 19:00 hrs on normal weekdays	When one documented complaint is received from any one of the noise sensitive receivers (NSRs) or 75 dB(A) recorded at the monitoring station	75 dB(A) at NSRs
Operational Noise:
07:00 – 19:00 hrs on all days	When one documented complaint is received from any one of the noise sensitive receivers (NSRs) or 75 dB(A) recorded at the monitoring station	65 dB(A) at NSRs ^(c)
19:00 – 23:00 hrs on all days		65 dB(A) at NSRs ^(c)
23:00 – 07:00 hrs on all days		55 dB(A) at NSRs ^(c)
Notes: (a) 75dB(A) along and at about 100m from the SENTX site boundary was set as the Action Level. (b) Limits specified in the GW-TM and IND-TM for construction and operational noise, respectively. (c) Limit Level only apply to operational noise without road traffic and construction activities noise.

Noise monitoring was performed by ALS Technichem (HK) Pty Ltd (HOKLAS Registration No. 066) using a sound level meter placed at the designated monitoring station NM1 (see Figure 2.1) in accordance with the requirements stipulated in the updated EM&A Manual. Acoustic calibrator was deployed to check the sound level meter at a known sound pressure level. Details of the deployed equipment are provided in Table 2.16.

Table 2.16 Noise Monitoring Details

Monitoring Station ⁽¹⁾	Location	Parameter	Frequency and Duration	Monitoring Dates	Equipment
NM1	SENTX Site Boundary (North)	L_{eq (30 min)} measurement between 07:00 and 19:00 hours on normal weekdays (Monday to Saturday)	Once per week for 30 mins during the construction and operation period of the Project	7, 14, 20, 28 January 2021 4, 9, 17, 25 February 2021 4, 11, 18, 25 March 2021 1, 8, 15, 22, 29 April 2021 6, 13, 20, 27 May 2021 3, 10, 17, 24, 30 June 2021 8, 15, 22, 29 July 2021 5, 12, 19, 26 August 2021 2, 9, 16, 23, 30 September 2021 7, 15, 21, 28 October 2021 4, 11, 18, 25 November 2021 2, 9, 14, 22, 28 December 2021	Sound Level Meter: B&K 2238 (S/N: 2285721) (S/N: 2285722) (S/N: 2285762) Rion NL-31 (S/N: 00410221) Rion NL-52 (S/N: 00142581) (S/N: 00921191) Acoustic Calibrator: Rion NC-73 (S/N: 10655561) Rion NC-74 (S/N: 34657230) (S/N: 34657231) Rion NC-75 (S/N: 34680623) 3M AC-300 (S/N: AC300006213)

Monitoring Station ⁽¹⁾

Location

Parameter

Frequency and Duration

Monitoring Dates

Equipment

NM1

SENTX Site Boundary (North)

L_{eq
(30 min)} measurement between 07:00 and 19:00 hours on normal weekdays

(Monday to Saturday)

Once per week for 30 mins during the construction and operation period of the Project

7, 14, 20, 28 January 2021

4, 9, 17, 25 February 2021

4, 11, 18, 25 March 2021

1, 8, 15, 22, 29 April 2021

6, 13, 20, 27 May 2021

3, 10, 17, 24, 30 June 2021

8, 15, 22, 29 July 2021

5, 12, 19, 26 August 2021

2, 9, 16, 23, 30 September 2021

7, 15, 21, 28 October 2021

4, 11, 18, 25 November 2021

2, 9, 14, 22, 28 December 2021

Sound Level Meter:

B&K 2238 (S/N: 2285721) (S/N: 2285722) (S/N: 2285762)

Rion NL-31 (S/N: 00410221)

Rion NL-52

(S/N: 00142581)

(S/N: 00921191)

Acoustic Calibrator:

Rion NC-73 (S/N: 10655561)

Rion NC-74 (S/N: 34657230)

(S/N: 34657231)

Rion NC-75 (S/N: 34680623)

3M AC-300

(S/N: AC300006213)

2.2.2 Monitoring Schedule for the Reporting Period

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

2.2.3 Results and Observations

A total of 52 impact noise monitoring events were scheduled during the reporting period. However, noise monitoring on 4 March, 15 April, 24 June, 5 August, 12 August, 16 September and 15 October 2021 were cancelled due to adverse weather. The noise monitoring results are summarised in Table 2.17 and graphically presented in Annex E1.

Table 2.17 Summary of Construction/Operation Noise Monitoring Results in the Reporting Period

Month	Monitoring Station	Measured Noise Level L_{eq (30 min)}, dB(A)
Month	Monitoring Station	Average	Range	Action and Limit Level
January 2021	NM1	51.1	49.8 – 52.6	75
February 2021	NM1	51.0	49.8 – 54.1	75
March 2021	NM1	51.0	49.3 – 52.2	75
April 2021	NM1	53.9	51.6 – 56.0	75
May 2021	NM1	54.1	49.0 – 56.2	75
June 2021	NM1	54.6	51.9 – 56.0	75
July 2021	NM1	53.1	50.5 – 55.5	75
August 2021	NM1	53.1	52.0 – 54.1	75
September 2021	NM1	53.7	51.7 – 55.9	75
October 2021	NM1	53.5	49.7 – 56.4	75
November 2021	NM1	51.4	49.0 – 53.4	75
December 2021	NM1	49.9	47.0 – 51.1	75

Major noise sources identified during the noise monitoring included noise from operations of SENTX, the existing SENT landfill and the TKO Area 137 Fill Bank, aircrafts and insects.

No exceedance of the Action and Limit Levels for construction/operation noise monitoring was recorded in the reporting period. No further mitigation measure was required in accordance with the Event and Action Plan presented in Annex E2.

2.3 Water Quality Monitoring

2.3.1 Surface Water Quality Monitoring

Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project, impact surface water quality monitoring were carried out at the three designated surface water discharge points (i.e. DP3, DP4 and DP6) at weekly and monthly intervals during construction phase and operation/ restoration phase, respectively to ensure that the SENTX will not cause adverse water quality impact. Temporary relocation of surface water discharge point DP4 to DP4 (Future, temporary) as an interim arrangement due to site constraints and construction sequence was approved by EPD on 14 May 2019. Impact surface water quality monitoring was carried out at DP4 (Future, temporary) (i.e. DP4T) from the monitoring event on 16 May 2019. In addition, suspension of impact surface water quality monitoring at DP3 was approved under the Baseline Monitoring Report by EPD on 24 July 2019 until the actual commencement of construction works affecting DP3 in 2022.

Dissolved Oxygen (DO) and pH value were measured in situ whereas the level of suspended solids (SS) were determined by ALS Technichem (HK) Pty Ltd (HOKLAS Registration No. 066).

The Action and Limit Levels of the surface water quality impact monitoring are provided in Table 2.18.

Table 2.18 Action and Limit Levels for Surface Water Quality

Parameters	Action Level	Limit Level
	DP4 & DP6
Construction Phase:
DO	< 5.80 mg/L	< 5.42 mg/L
SS	> 11.7 mg/L	> 12.7 mg/L
pH	> 8.39	> 8.40
Operation/ Restoration Phase:
Ammoniacal-nitrogen		> 7.1 mg/L
COD		> 30 mg/L
SS		> 20 mg/L

The locations of the monitoring stations for the Project are shown in Figure 2.1. All in situ monitoring instruments were checked, calibrated and certified by a laboratory accredited under HOKLAS or other international accreditation scheme before use, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the surface water quality monitoring programme. Calibration for a DO meter was carried out before measurement according to the instruction manual of the equipment model. Details of the equipment used in the impact surface water quality monitoring works are provided in Table 2.19.

Table 2.19 Impact Surface Water Quality Monitoring Details

Monitoring Station	Location	Frequency	Monitoring Dates	Parameter		Equipment
Construction Phase:
DP4 (Future, temporary)	Surface water discharge point DP4	Weekly	7, 14, 20, 28 January 2021 4, 9, 17, 25 February 2021 4, 11, 18, 25 March 2021 1, 8, 15, 22, 29 April 2021 6, 13, 20, 27 May 2021 3, 10, 17, 24, 30 June 2021 8, 15, 22, 29 July 2021 5, 12, 19, 26 August 2021 2, 9, 16, 23, 30 September 2021 7, 15, 21, 28 October 2021 4, 11, 18 November 2021	•pH •DO •SS		YSI Professional DSS (S/N: 17B102764) DSS (S/N: 15H103928) pH Meter AZ8685 (S/N:1259868) YSI Professional DSS (S/N: 15H103928)
DP6	Surface water discharge point DP6	Weekly		•pH •DO •SS
Operation/ Restoration Phase:
DP4 (Future, temporary)	Surface water discharge point DP4	Monthly	25 November 2021, 28 December 2021	· pH · Electrical conductivity (EC) · DO · SS · COD · BOD₅ · TOC · Ammoniacal–nitrogen · Nitrate-nitrogen · Nitrite–nitrogen · TKN · TN · Phosphate · Sulphate · Sulphide · Carbonate · Oil & Grease	· Bicarbonate · Chloride · Sodium · Potassium · Calcium · Magnesium · Nickel · Manganese · Chromium · Cadmium · Copper · Lead · Iron · Zinc · Mercury · Boron	YSI Professional DSS (S/N: 15H103928) YSI Professional DSS (S/N: 17B102764)
DP6	Surface water discharge point DP6	Monthly	25 November 2021, 28 December 2021
Notes: (a) DP4 was temporary relocated to DP4 (Future, temporary) (i.e. DP4T) as an interim discharge point from the monitoring event on 16 May 2019. (b) Impact surface water quality monitoring at DP3 was suspended from the monitoring event on 25 July 2019 until the actual commencement of construction works affecting DP3 in 2022.

Monitoring Schedule for the Reporting Period

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

Results and Observations

A total of 48 monitoring events for impact surface water quality monitoring were scheduled at all designated monitoring stations during the reporting period. However, sampling could not be carried out at the monitoring events below due to insufficient flow:

· January 2021 at all monitoring locations;

· 4, 9 and 17 February 2021 at all monitoring locations and 25 February 2021 at DP6;

· March 2021 at all monitoring locations;

· April 2021 at all monitoring locations;

· May 2021 at all monitoring locations;

· 3, 10, 17 June 2021 at DP6, 24 June 2021 at DP4T and 30 June 2021 at all monitoring locations;

· 8 and 22 July 2021 at all monitoring locations, 15 July 2021 at DP6 and 29 July 2021 at DP4T;

· August 2021 at all monitoring locations;

· September 2021 at all monitoring locations

· October 2021 at all monitoring locations;

· 4, 18 and 25 November 2021 at all monitoring locations; and

· 28 December 2021 at all monitoring locations.

Impact surface water quality monitoring results and graphical presentations are provided in Annex F1.

Action and Limit Level exceedances were recorded for surface water quality impact monitoring in the reporting period and actions in accordance with the Event and Action Plan presented in Annex F2 were undertaken. Investigation on the Action and Limit Levels exceedance were conducted and summarised in Table 2.20 below. Investigation reports of the exceedances are presented in Annex F6.

Table 2.20 Details of Exceedances Recorded for Surface Water Quality Monitoring

Date	Monitoring Location	Parameter	Type of Exceedance		Remarks
25 February 2021	DP4T	SS	Limit Level		Project-related
3 June 2021	DP4 (Future, temporary)	pH	Limit Level		Project-related
3 June 2021	DP4 (Future, temporary)	SS	Limit Level		Project-related
10 June 2021	DP4 (Future, temporary)	pH	Limit Level		Project-related
17 June 2021	DP4 (Future, temporary)	pH	Limit Level		Project-related
24 June 2021	DP6	pH	Limit Level		Project-related
24 June 2021	DP6	SS	Limit Level		Project-related
15 July 2021	DP4 (Future, temporary)	pH	Limit Level	Project-related
29 July 2021	DP6	SS	Limit Level	Project-related
29 July 2021	DP6	DO	Limit Level	Project-related

Based on the investigation conducted for the monitoring event with potential Action and Limit Levels exceedances with the Contractor, and the IEC, the exceedances were found deemed to Project-related activities.

The Contractor was reminded to implement all relevant mitigation measures for the construction works and maintain good site practice. The ET will keep track on the monitoring data and ensure Contractor’s compliance of the environmental requirements.

2.3.2 Leachate Monitoring

Monitoring Requirements and Equipment

According to the updated EM&A Manual, continuous monitoring of leachate level and daily monitoring of effluent quality were carried out during the operation/ restoration phase.

Temperature, pH and volume of the effluent discharged from the leachate treatment plant were measured in-situ whereas the parameters as listed in Table 2.22 were determined by ALS Technichem (HK) Pty Ltd. (HOKLAS Registration No. 066).

The Limit Levels of the leachate monitoring are provided in Table 2.21.

Table 2.21 Limit Levels for Leachate Levels and Effluent Quality

Parameters	Limit Level
Leachate Levels
Leachate levels above the basal liner	1 m above the primary liner of the leachate containment system
Effluent Quality
Temperature	> 43 °C
pH Value	6 – 10
Volume Discharged	>1,500 m³
Suspended Solids (SS)	> 800 mg/L
Phosphate	> 25 mg/L
Sulphate	> 900 mg/L
Total Inorganic Nitrogen ^(a)	> 100 mg/L
Biochemical Oxygen Demand (BOD)	> 800 mg/L
Chemical Oxygen Demand (COD)	> 2,000 mg/L
Oil & Grease	> 20 mg/L
Boron	> 7,000 µg/L
Iron	> 7.5 mg/L
Cadmium	> 1 µg/L
Chromium	> 400 µg/L
Copper	> 1,000 µg/L
Nickel	> 800 µg/L
Zinc	> 800 µg/L
Note: (a) Total Inorganic Nitrogen include Ammoniacal-nitrogen, Nitrite-nitrogen and Nitrate-nitrogen.

All in situ monitoring instruments were checked, calibrated and certified by a laboratory accredited under HOKLAS or other international accreditation scheme before use, and subsequently re-calibrated at 3 monthly intervals throughout all stages of the leachate quality monitoring programme. Details of the equipment used are provided in Table 2.22.

Table 2.22 Leachate Levels and Effluent Quality Monitoring Details

Location	Frequency	Parameter	Monitoring Dates	Equipment
Leachate levels above the basal liner	Continuous	Leachate Levels	21 - 30 November 2021, 1 – 31 December 2021	Pairs of pressure transducers
Effluent discharged from LTP	Daily for the first 3 months upon full operation of the LTP at wet season (Apr to Sep) and dry season (Oct to Mar), respectively and reduce to monthly thereafter subject to the monitoring results of the first 3 months for each season and agreement with the EIAO Authority, IEC and IC. ^(a)	On-site Measurements: · Volume · pH · Temperature Laboratory analysis: · Suspended Solids · COD · BOD₅ · TOC · Ammoniacal–nitrogen · Nitrate-nitrogen · Nitrite–nitrogen · Total Nitrogen · Sulphate · Phosphate · Oil & Grease · Alkalinity · Chloride · Calcium · Potassium · Magnesium · Iron · Zinc · Copper · Chromium · Nickel · Cadmium · Boron	21 - 30 November 2021, 1 – 31 December 2021	Lutron WA-2017SD (S/N: T.016811)

Note: (a) Reduction of monitoring frequency will be subject to the monitoring results to demonstrate environmentally acceptable performance.

Monitoring Schedule for the Reporting Month

The schedule for leachate monitoring during the reporting period is provided in Annex C.

Results and Observations

The leachate levels and effluent quality monitoring results are summarised in Table 2.23 and Table 2.24, respectively. The detailed monitoring results are provided in Annex F3 and Annex F4, respectively.

Table 2.23 Summary of Leachate Levels in the Reporting Period

Month	Monitoring Location	Average Leachate Head Levels (cm) (Range in Bracket)	Limit Level (cm)
	Pump Station No. 1X (Cell 1X)
November 2021	Meter No. X-1	61 (44 – 79)	> 178
	Meter No. X-2	81 (64 – 99)
	Average	71 (54 – 89)
December 2021	Meter No. X-1	65 (44 – 111)
	Meter No. X-2	78 (10 – 111)
	Average	71 (48 – 101)
	Pump Station No. 2X (Cell 2X)
December 2021	Meter No. X-1	81 (70 – 88)	> 180
	Meter No. X-2	82 (73 – 88)
	Average	81 (72 – 87)
	Pump Station No. 3X (Cell 3X)
December 2021	Meter No. X-1	89 (79 – 99)	> 175
	Meter No. X-2	89 (79 – 99)
	Average	89 (79 – 89)

Table 2.24 Summary of Effluent Quality Monitoring Results in the Reporting Period

Month	Parameters	Average Monitoring Results (Range in Bracket)	Limit Level
	Effluent Discharged from LTP
November 2021	Temperature	25.0°C (18.6°C - 28.9°C)	> 43 °C
	pH Value	8.4 (8.3 – 8.5)	6 – 10
	Volume Discharged	981m³ (301m³ - 1,462m³)	>1,500 m³
	Suspended Solids (SS)	27.0mg/L (20.4mg/L - 35.2mg/L)	> 800 mg/L
	Phosphate	9.7mg/L (9.2mg/L – 10.3mg/L)	> 25 mg/L
	Sulphate	64mg/L (58mg/L – 70mg/L)	> 900 mg/L
	Total Inorganic Nitrogen ^(a)	61.4mg/L (46.9mg/L – 70.2mg/L)	> 100 mg/L
	BOD	10mg/L (6mg/L – 14mg/L)	> 800 mg/L
	COD	1,018mg/L (888mg/L – 1,620mg/L)	> 2,000 mg/L
	Oil & Grease	<5mg/L (<5mg/L – <5mg/L)	> 20 mg/L
	Boron	5,246µg/L (4,900µg/L – 5,500µg/L)	> 7,000 µg/L
	Iron	1.40mg/L (1.28mg/L – 1.56mg/L)	> 7.5 mg/L
	Cadmium	<1.0µg/L (<1.0µg/L – <1.0µg/L)	> 1 µg/L
	Chromium	126µg/L (120µg/L – 134µg/L)	> 400 µg/L
	Copper	11µg/L (11µg/L – 11µg/L)	> 1,000 µg/L
	Nickel	114µg/L (110µg/L – 117µg/L)	> 800 µg/L
	Zinc	65µg/L (60µg/L – 70µg/L)	> 800 µg/L
December 2021	Temperature	25.7°C (20.0°C – 30.6°C)	> 43 °C
	pH Value	8.4 (8.3 – 8.5)	6 – 10
	Volume Discharged	1,025m³ (473m³ - 1,435m³)	>1,500 m³
	Suspended Solids (SS)	20.0mg/L (10.1mg/L - 33.8mg/L)	> 800 mg/L
	Phosphate	10.0mg/L (7.7mg/L – 11.5mg/L)	> 25 mg/L
	Sulphate	68mg/L (57mg/L – 92mg/L)	> 900 mg/L
	Total Inorganic Nitrogen ^(a)	62.6mg/L (42.9mg/L – 80.7mg/L)	> 100 mg/L
	BOD	10mg/L (6mg/L – 24mg/L)	> 800 mg/L
	COD	987mg/L (785mg/L – 1,430mg/L)	> 2,000 mg/L
	Oil & Grease	<5mg/L (<5mg/L – <5mg/L)	> 20 mg/L
	Boron	5,143µg/L (4,530µg/L – 6,050µg/L)	> 7,000 µg/L
	Iron	1.44mg/L (1.21mg/L – 1.74mg/L)	> 7.5 mg/L
	Cadmium	<1.0µg/L (<1.0µg/L – <1.0µg/L)	> 1 µg/L
	Chromium	129µg/L (112µg/L – 146µg/L)	> 400 µg/L
	Copper	43µg/L (24µg/L – 61µg/L)	> 1,000 µg/L
	Nickel	114µg/L (98µg/L – 124µg/L)	> 800 µg/L
	Zinc	57µg/L (40µg/L – 100µg/L)	> 800 µg/L
Note: (a) Total Inorganic Nitrogen include Ammoniacal-nitrogen, Nitrite-nitrogen and Nitrate-nitrogen.

All the leachate levels and effluent quality monitoring results were below the Limit Levels in the reporting period. No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex F2.

2.3.3 Groundwater Monitoring

Monitoring Requirements and Equipment

According to the updated EM&A Manual of the Project with incorporation of the proposed updates under the Amendment Summary approved by EPD on 15 June 2020, groundwater monitoring was carried out at 14 perimeter groundwater monitoring wells (including 3 up-gradient wells and 11 down-gradient wells) (i.e. MWX-1 to MWX-14) to monitor the groundwater quality and level of the perimeter groundwater monitoring wells at monthly interval.

The Limit Levels for groundwater quality is provided in Table 2.25 below.

Table 2.25 Limit Levels for Groundwater Quality

Location	Limit Levels
Location	Ammoniacal-nitrogen (mg L^-1)	COD (mg L^-1)
MWX-1	5.00	30
MWX-2	5.00	30
MWX-3	5.00	30
MWX-4	7.63	36
MWX-5	5.00	30
MWX-6	5.00	46
MWX-7	6.55	36
MWX-8	15.85	50
MWX-9	7.30	71
MWX-10	5.00	30
MWX-11	5.00	30
MWX-12	5.00	30
MWX-13	5.00	30
MWX-14	5.00	30

A bladder pump with Teflon sampling tube and adjustable discharge rates was used for purging and taking of groundwater sample from the monitoring wells. Filtered groundwater samples were collected by connecting a disposable in-line filter system to the tubing of the sampling pump, prior to storage and analysis by ALS Technichem (HK) Pty Ltd. (HOKLAS Registration No. 066).

A portable dip meter with 5mm accuracy was used for measurement of groundwater level at each well. The dip meter has an audio indicator of the water level and was checked before use.

The measurements of pH and electrical conductivity (EC) were undertaken in situ. In situ monitoring instruments in compliance with the specifications listed under Section 4.3.2 of the updated EM&A Manual were used to undertake the groundwater quality monitoring for the Project.

Details of the equipment used and the monitoring locations are summarised in Table 2.26 and illustrated in Figure 2.1, respectively.

Table 2.26 Groundwater Monitoring Details

Monitoring Location	Frequency	Parameter	Monitoring Dates	Equipment
All groundwater monitoring wells (MWX-1 to MWX-14)	Monthly	· Water level · pH · EC · COD · BOD5 · TOC · Ammoniacal–nitrogen · Nitrate-nitrogen · Nitrite–nitrogen · TKN · TN · Sulphate · Sulphide · Carbonate · Bicarbonate · Phosphate	· Chloride · Sodium · Potassium · Calcium · Magnesium · Nickel · Manganese · Chromium · Cadmium · Copper · Lead · Iron · Zinc · Mercury · Boron	7-8 Dec 2021	YSI Professional DSS (S/N: 17B102764)

Monitoring Location

Frequency

Parameter

Monitoring Dates

Equipment

All groundwater monitoring wells (MWX-1 to MWX-14)

Monthly

· Water level

· pH

· EC

· COD

· BOD5

· TOC

· Ammoniacal–nitrogen

· Nitrate-nitrogen

· Nitrite–nitrogen

· TKN

· TN

· Sulphate

· Sulphide

· Carbonate

· Bicarbonate

· Phosphate

· Chloride

· Sodium

· Potassium

· Calcium

· Magnesium

· Nickel

· Manganese

· Chromium

· Cadmium

· Copper

· Lead

· Iron

· Zinc

· Mercury

· Boron

7-8 Dec 2021

YSI Professional DSS (S/N: 17B102764)

Monitoring Schedule for the Reporting Month

The schedule for groundwater quality monitoring during the reporting period is provided in Annex C.

Results and Observations

The groundwater quality monitoring results and detailed monitoring results are summarised in Table 2.27 and provided in Annex F5, respectively.

Table 2.27 Summary of Groundwater Monitoring Results in the Reporting Period

Location	Ammoniacal-nitrogen (mg L^-1)		COD (mg L^-1)
Location	Monitoring Results	Limit Levels	Monitoring Results	Limit Levels
MWX-1	0.29	5.00	11	30
MWX-2	0.02	5.00	3	30
MWX-3	1.33	5.00	19	30
MWX-4	6.79	7.63	36	36
MWX-5	1.95	5.00	28	30
MWX-6	3.52	5.00	56	46
MWX-7	5.42	6.55	23	36
MWX-8	12.50	15.85	44	50
MWX-9	5.34	7.30	20	71
MWX-10	0.03	5.00	6	30
MWX-11	0.02	5.00	4	30
MWX-12	<0.01	5.00	<2	30
MWX-13	0.04	5.00	<2	30
MWX-14	<0.01	5.00	<2	30

Limit Levels exceedance was recorded for groundwater monitoring in the reporting period and actions in accordance with the Event and Action Plan presented in Annex F2 were undertaken. Investigation of the Limit Levels exceedance was conducted and the investigation report is presented in Annex F6.

Based on the investigation conducted for the monitoring event with potential Limit Levels exceedance with the Contractor and the IEC, the groundwater quality (COD) exceedance at MWX-6 on 8 December 2021 was considered non Project-related. The Contractor was reminded to implement all relevant mitigation measures for the construction and operation works and maintain good site practice. The ET will keep track on the monitoring data and ensure Contractor’s compliance of the environmental requirements.

2.4 Landfill Gas Monitoring

2.4.1 Monitoring Requirements

According to the updated EM&A Manual of the Project, landfill gas monitoring was carried out at the perimeter of the waste boundary (monitoring wells), area between the SENTX Site boundary and the waste boundary (surface emission), occupied on-site building, service voids, utilities pit and manholes in the vicinity of the SENTX (build-up of landfill gas) during the operation/restoration phase.

The Limit Levels for landfill gas monitoring is provided in Table 2.28 below.

Table 2.28 Limit Levels for Landfill Gas Constituents

Parameters	Monitoring Location	Limit Level (% (v/v))
Perimeter Landfill Gas Monitoring Wells ^(a)
Methane & Carbon Dioxide		Methane	Carbon Dioxide
	LFG1	1.0	3.2
	LFG2	1.0	4.3
	LFG3	1.0	6.3
	LFG4	1.0	7.0
	LFG5	1.0	3.4
	LFG6	1.0	9.1
	LFG7	1.0	1.5
	LFG8	12.6	2.4
	LFG9	2.5	1.7
	LFG10	3.5	1.6
	LFG11	3.0	2.0
	LFG12	13.2	1.5
	LFG13	22.5	2.7
	LFG14	5.2	1.8
	LFG15	18.2	2.0
	LFG16	1.0	2.0
	LFG17	17.8	2.4
	LFG18	2.3	2.1
	LFG19	6.3	3.1
	LFG20	1.0	4.6
	LFG21	1.0	4.8
	LFG22	1.0	4.0
	LFG23	1.0	10.3
	LFG24	1.0	4.7
	GP1	1.0	10.6
	GP2 (shallow)	1.0	11.4
	GP2 (deep)	1.0	10.4
	GP3 (shallow)	1.0	6.9
	GP3 (deep)	1.0	5.6
	GP4 (shallow)	1.0	11.6
	GP4 (deep)	1.0	7.7
	GP5 (shallow)	1.0	10.8
	GP5 (deep)	1.0	7.5
	GP6	1.0	8.4
	GP7	1.0	4.5
	GP12	1.0	2.3
	GP15	1.0	2.2
	P7	1.0	2.5
	P8	1.0	1.7
	P9	1.0	2.7
Service Voids, Utilities Pits and Manholes
Methane (or flammable gas)	Service voids, utilities pits and manholes	1% by volume
Permanent Gas Monitoring System
Methane (or flammable gas)	Permanent Gas Monitoring System	1% by volume (20% LEL)
Notes: (a) Limit Levels established based on the pre-operation phase baseline and additional landfill gas monitoring results in the Pre-operation Baseline Monitoring Report.

Gas analysers in compliance with the specifications listed under Section 5.4.1 of the updated EM&A Manual were used to monitor the gas parameters at the landfill gas monitoring wells, service voids, utilities pits and manholes. The gas analyser was calibrated by a laboratory accredited under HOKLAS at yearly intervals and checked before use to ensure the validity and accuracy of the results. A portable dip meter was used to monitor the water level in the monitoring wells.

Permanent gas monitoring systems with pre-set alarm levels for methane at 20% lower explosive limit (LEL, equivalent to 1% methane gas (v/v)) were installed and operated in all occupied on-site buildings at SENTX. A central control panel is equipped to alert site personnel when the gas concentration at any detector reaches the alarm level.

The equipment used in the landfill gas monitoring programme is summarised in Table 2.29. The landfill gas monitoring locations for perimeter landfill gas monitoring wells and service voids, utilities and manholes along the Site boundary and within the SENTX site are illustrated in Figure 2.3 and Annex G1, respectively.

Table 2.29 Landfill Gas Monitoring Details

Monitoring Location	Frequency	Parameter	Monitoring Dates	Equipment
Perimeter landfill gas monitoring wells (LFG1 to LFG24, P7 to P9, GP1 to GP7, GP12 and GP15)	Monthly	Ÿ Methane Ÿ Carbon dioxide Ÿ Oxygen Ÿ Atmospheric pressure	14 Dec 2021	GA5000 (S/N: G507306)
Service voids, utilities and manholes along the Site boundary and within the SENTX Site (UU1 to UU28)	Monthly	Ÿ Methane Ÿ Carbon dioxide Ÿ Oxygen	16 Dec 2021	GA5000 (S/N: G507306)
Permanent gas monitoring system in all occupied on-site buildings	Continuous	Ÿ Methane (or flammable gas) by permanent gas monitoring system	1 – 31 Dec 2021	Permanent gas monitoring system

Monitoring Schedule for the Reporting Month

The schedule for dust monitoring during the reporting period is provided in Annex C.

Results and Observations

The landfill gas monitoring results are summarised and provided in Tables 2.30 - 2.31 and Annex G2, respectively.

Table 2.30 Summary of Landfill Gas Monitoring Results at Perimeter LFG Monitoring Wells in the Reporting Period

Location	Methane (% (v/v))		Carbon Dioxide (% (v/v))
Location	Monitoring Results	Limit Levels ^(a)	Monitoring Results	Limit Levels ^(a)
LFG1	3.2	1.0	0.1	3.2
LFG2	4.3	1.0	0.1	4.3
LFG3	6.3	1.0	0.9	6.3
LFG4	7.0	1.0	0.0	7.0
LFG5	3.4	1.0	0.2	3.4
LFG6	9.1	1.0	0.1	9.1
LFG7	1.5	1.0	0.0	1.5
LFG8	2.4	12.6	0.0	2.4
LFG9	1.7	2.5	0.1	1.7
LFG10	1.6	3.5	0.0	1.6
LFG11	2.0	3.0	0.1	2.0
LFG12	1.5	13.2	0.0	1.5
LFG13	2.7	22.5	0.0	2.7
LFG14	1.8	5.2	0.0	1.8
LFG15	2.0	18.2	0.4	2.0
LFG16	2.0	1.0	0.1	2.0
LFG17	2.4	17.8	0.2	2.4
LFG18	2.1	2.3	0.1	2.1
LFG19	3.1	6.3	0.1	3.1
LFG20	4.6	1.0	1.1	4.6
LFG21	4.8	1.0	2.0	4.8
LFG22	4.0	1.0	1.0	4.0
LFG23	10.3	1.0	2.1	10.3
LFG24	4.7	1.0	0.9	4.7
GP1	10.6	1.0	5.2	10.6
GP2 (shallow)	11.4	1.0	0.3	11.4
GP2 (deep)	10.4	1.0	0.1	10.4
GP3 (shallow)	6.9	1.0	2.5	6.9
GP3 (deep)	5.6	1.0	0.2	5.6
GP4 (shallow)	11.6	1.0	0.7	11.6
GP4 (deep)	7.7	1.0	1.7	7.7
GP5 (shallow)	10.8	1.0	5.4	10.8
GP5 (deep)	7.5	1.0	0.3	7.5
GP6	8.4	1.0	5.6	8.4
GP7	4.5	1.0	0.1	4.5
GP12	2.3	1.0	0.0	2.3
GP15	2.2	1.0	0.0	2.2
P7	2.5	1.0	0.0	2.5
P8	1.7	1.0	0.0	1.7
P9	2.7	1.0	0.0	2.7
Notes: (a) Limit Levels established based on the pre-operation phase baseline and additional landfill gas monitoring results in the Pre-operation Baseline Monitoring Report.

Table 2.31 Summary of Landfill Gas Monitoring Results at Service Voids, Utilities Pits and Manholes in the Reporting Period

Location	Methane (% (v/v))
Location	Monitoring Results	Limit Levels
UU01	0.1	1.0
UU02	0.0	1.0
UU03	0.0	1.0
UU04	0.1	1.0
UU05	0.0	1.0
UU06	0.0	1.0
UU07	0.1	1.0
UU08	0.0	1.0
UU09	0.2	1.0
UU10	0.1	1.0
UU11	Inaccessible due to on-going construction work	1.0
UU12	Inaccessible due to on-going construction work	1.0
UU13	Inaccessible due to on-going construction work	1.0
UU14	Inaccessible due to on-going construction work	1.0
UU15	0.1	1.0
UU16	0.1	1.0
UU17	0.3	1.0
UU18	0.1	1.0
UU19	0.0	1.0
UU20	0.1	1.0
UU21	0.0	1.0
UU22	0.0	1.0
UU23	0.0	1.0
UU24	0.0	1.0
UU25	0.0	1.0
UU26	0.0	1.0
UU27	0.0	1.0
UU28	0.0	1.0

The alarm of the permanent gas monitoring systems with pre-set levels for methane at 20% lower explosive limit (LEL, equivalent to 1% methane gas (v/v)) was not triggered at all occupied on-site buildings at SENTX in November and December 2021.

All the landfill gas monitoring results were below the Limit Levels in the reporting period. No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex G3.

2.5 Landscape and Visual Monitoring

2.5.1 Monitoring Requirements

According to the updated EM&A Manual of the Project, the monthly landscape and visual audit was conducted on 19 January, 24 February, 26 March, 16 April, 21 May, 29 June, 26 July, 25 August, 28 September, 26 October, 19 November and 22 December 2021 to monitor the implementation of the landscape and visual mitigation measures during construction and operation/ restoration phase.

All relevant environmental mitigation measures listed in the approved EIA Report and the updated EM&A Manual and their implementation status are summarised in Annex B.

2.5.2 Results and Observations

The Contractor has implemented environmental mitigation measures as stated in the approved EIA Report and the EM&A Manual.

Regarding the landscape and visual audit, the Contractor was reminded to maintain the advance screen planting works as soon as possible to ensure effective screening of views of project works from the High Junk Peak Trail. The Contractor has considered the mitigation measures during the design phase, including the preparation of the Construction Drawings and Detailed Landscape Design Drawings.

2.6 EM&A Site Inspection

Site inspections were carried out on a weekly basis with the Contractor, IEC and ER to monitor the implementation of proper environmental pollution control and mitigation measures for air quality, noise, water quality, landfill gas and waste management under the Project. In the reporting period, 51 site inspections were carried out on the following dates:

· 7, 14, 21 and 28 January 2021;

· 9, 18 and 25 February 2021;

· 4, 11, 18 and 25 March 2021;

· 1, 8, 14, 22 and 29 April 2021;

· 6, 13, 20 and 27 May 2021;

· 3, 10, 17 and 24 June 2021;

· 2, 8, 15, 22 and 29 July2021;

· 5, 12, 19 and 26 August 2021;

· 2, 9, 16, 23 and 30 September 2021;

· 7, 15, 21 and 28 October 2021;

· 4, 11, 17 and 26 November 2021; and

· 2, 9, 16, 23 and 30 December 2021.

Key observations during the site inspections are summarized in Table 2.32.

Table 2.32 Key Observations Identified during the Site Inspections in this Reporting Period

Inspection Date	Environmental Observations and Recommendations
7 January 2021	· The Contractor shall remove the general refuse and construction waste near future EPD building, at future GVL building and around future bioplant building and dispose of the waste accumulated at the refuse skips near DP4T and DP6 regularly. · The Contractor shall provide drip trays for the chemicals stored at future GVL building and near Cell 2X. · The Contractor shall enhance watering around the site, especially near Cell 3X and provide the water truck routing plan for review.
14 January 2021	· The Contractor shall display NRMM label on the cherry picker near future maintenance building. · The Contractor shall remove the general refuse accumulated along the EVA and dispose of the waste regularly. · The Contractor shall provide drip trays for the chemicals stored near EVA. · The Contractor shall clean up the oil spillage at the cherry picker near future EPD building, the generator near DP6 and the excavator near Cell 2X and treat the clean-up materials as chemical waste.
21 January 2021	· The Contractor shall enhance watering along the Western site boundary to minimise dust impacts. · The Contractor shall remove the construction materials/ waste accumulated at LTP drain and near DP6 and dispose of the waste regularly.
28 January 2021	· The Contractor shall clean up the oil spillage at the drip tray near DP6 and treat the clean-up materials as chemical waste. · The Contractor shall designate an area for concrete truck washing and avoid discharge of wash-water into surrounding water body. · The Contractor shall remove the general refuse accumulated near future FS tank, future carpark area, future maintenance building and along EVA and dispose of the waste regularly. · The Contractor shall repair/ replace the refuse skip near DP6 to ensure proper waste storage. · The Contractor shall spray water when conducting dusty operation near Southern site boundary to ensure the entire surface is wet. · The Contractor shall cover the dusty materials accumulated at future bioplant building to minimise dust impacts.
9 February 2021	· The Contractor shall remove the general refuse accumulated near future bioplant building and construction waste along the Southern site boundary and dispose of the waste regularly. · The Contractor shall clean up the oil spillage around the drip tray near site entrance and treat the clean-up materials as chemical waste. · The Contractor shall maintain the concrete truck washing area near DP4T to avoid overflow of wash-water into surrounding water body.
18 February 2021	· The Contractor shall remove the oil contained in the drip tray near DP6 and treat the clean-up materials as chemical waste. · The Contractor shall maintain the concrete truck washing area near DP4T to avoid overflow of wash-water into surrounding water body. · The Contractor shall remove the deposited silt and grit at the sediment trap regularly to ensure it is functioning properly at all times. · The Contractor shall maintain the temporary drain along Southern site boundary and fully adopt the approved temporary drainage plan.
25 February 2021	· The Contractor shall maintain the temporary drain along Southern site boundary, provide drainage pump along the drain and fully adopt the approved temporary drainage plan. · The Contractor shall remove the stockpile near sediment trap to minimise the generation of high SS runoff. · The Contractor shall clean up the oil spillage at the drip tray and generator near future bioplant and handle the clean-up materials as chemical waste. · The Contractor shall remove the general refuse accumulated near future GVL building and dispose of the regularly.
4 March 2021	· The Contractor shall maintain and properly form the temporary drain along Southern site boundary and fully adopt the approved temporary drainage plan. · The Contractor shall remove the stockpile and unused pipes near DP6 to minimise the generation of high SS runoff. · The Contractor shall remove the construction waste/ material accumulated at the drain at future bioplant and RC15 to ensure it is functioning properly at all times. · The Contractor shall maintain the chemical storage cabinets at future LFG plant to allow adequate ventilation and proper containment of potential leakage in accordance with the COP. · The Contractor shall review the capacity of the concrete truck washing area and ensure all wash-water are properly contained and treated before discharge.
11 March 2021	· The Contractor shall close the opening at DP6 to minimise SS runoff to the channel and ensure all surface water is treated by the Wetsep before discharge. · The Contractor shall remove the stagnant water/ chemical and construction materials accumulated in the drip trays near site entrance and future LTP and treat the clean-up materials as chemical waste. · The Contractor shall remove the general refuse accumulated near future EPD building and GVL building and dispose of the waste regularly. · The Contractor shall provide drip tray for the chemical stored at future GVL building. · The Contractor shall designate an area for concrete truck washing to ensure all wash-water is properly contained and treated before discharge. · The Contractor shall remove and dispose of the chemical container near sediment trap as chemical waste.
18 March 2021	· The Contractor shall replace the faded NRMM labels displayed on the excavator near existing LFG plant and generator near Cell 2X and display NRMM label on the water pump near Cell 2X, if necessary. · The Contractor shall continue the maintenance work and placement of liner at the temporary drain along Southern site boundary to fulfil the approved temporary drainage plan. · The Contractor shall remove the general refuse accumulated near future GVL building and at the drain around future LTP and dispose of the waste regularly.
25 March 2021	· The Contractor shall continue the construction and placement of liner at the temporary drain along Southern site boundary by the end of March 2021 to fulfil the approved temporary drainage plan. · The Contractor shall clean up the oil spillage at the generator near future weighbridge and at the mobile crane near future maintenance building and handle the clean-up materials as chemical waste. · The Contractor shall remove the general refuse accumulated near future GVL building and at the rest area for workers near DP6 and dispose of the waste regularly. · The Contractor shall replace the faded NRMM label displayed on the roller near pump sump 1. · The Contractor shall enhance watering around the site, especially near future weighbridge, around future LTP and DP6. · The Contractor shall cover the cement accumulated near pump sump 1 to minimise dust impact. · The Contractor shall wash the concrete trucks at designated area and avoid discharge of wash-water into surrounding water bodies. · The Contractor shall avoid accumulation of stagnant water at future LTP drain and spray larvicides for mosquito control. · The Contractor shall dispose of the empty chemical containers near existing LFG plant as chemical waste in accordance with the COP.
1 April 2021	· The Contractor shall continue the construction and placement of liner at the temporary drain along Southern site boundary and schedule to complete the works by 8 April 2021. The Contractor shall also review and update the outdated temporary drainage plan asap taking into account the latest site condition. · The Contractor shall replace the faded NRMM label displayed on the generator near future GVL building. · The Contractor shall remove the general refuse/ construction materials accumulated near pump house 3, future bioplant building and at drains near future GVL building and around future LTP and dispose of the waste regularly. · The Contractor shall clean up the oil spillage at the generator near future GVL building and handle the clean-up materials as chemical waste. · The Contractor shall cover the cement accumulated at future EPD building to minimise dust impact. · The Contractor shall avoid accumulation of stagnant water near future maintenance building and spray larvicides for mosquito control.
8 April 2021	· The Contractor shall provide/ replace the oil absorbent sheets at the generator near future weighbridge and drip tray near future LTP to soak up potential spill. · The Contractor shall remove the general refuse accumulated near future maintenance building and construction waste near LFG6 and dispose of the waste regularly. · The Contractor shall provide drip tray for the chemical stored at future maintenance building.
14 April 2021	· The Contractor shall wash the concrete truck at designated area and avoid discharge of wash-water to the surrounding water bodies near DP6. · The Contractor shall remove the general refuse/ construction waste accumulated near future LTP and dispose of the waste in the refuse skips regularly. · The Contractor shall provide drip tray for the chemical stored near future LTP.
22 April 2021	· The Contractor shall provide drip trays for the chemicals stored at future maintenance building and near future LTP. · The Contractor shall remove the general refuse accumulated near pump sump 3 and future maintenance building and dispose of the waste regularly. · The Contractor shall remove the cement grout remained at the old designated concrete truck washing area and avoid discharge of wash-water to the surrounding water bodies near DP4T.
29 April 2021	· The Contractor shall provide drip trays for the chemicals stored near existing LFG plant, future FS tank and future LTP. · The Contractor shall remove the stagnant water accumulated at former DP4T channel, pump sump 3 and at LTP drains and spray larvicides for mosquito control, if necessary. · The Contractor shall remove the general refuse/ construction waste accumulated at drains around future GVL building, future LTP and at DP6 channel to ensure the drains are functioning properly at all times.
6 May 2021	· The Contractor shall display a NRMM label on the generator near pump sump 3. · The Contractor shall provide drip trays for the chemicals stored near pump sump 3 and DP6. · The Contractor shall remove the stagnant water accumulated near future vehicle washing facilities and spray larvicides for mosquito control, if necessary. · The Contractor shall remove the general refuse accumulated near future vehicle washing facilities and provide enclosed bin for proper storage of general refuse.
13 May 2021	· The Contractor shall provide and replace the faced NRMM label displayed on the roller near future weighbridge and the generator near DP6. · The Contractor shall cover the cement stored at future maintenance building to minimise dust issues. · The Contractor shall dispose of the empty chemical container near future weighmaster house as chemical waste. · The Contractor shall remove the general refuse accumulated at the u-channel at barging point and near Cell 1X and dispose of the waste regularly.
20 May 2021	· The Contractor shall replace the faded NRMM label displayed on the generator near DP6. · The Contractor shall remove the general refuse accumulated near future guardhouse, resting area near pump sump 2, future vehicle washing facilities and near future LTP and dispose of the waste regularly to minimize odour and pest issues.
27 May 2021	· The Contractor shall display a NRMM label on the excavator near bar bending area. · The Contractor shall clean up the oil spillage at the roller near future weighmaster house and treat the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemicals stored near Cell 1X and the roller near future weighmaster house. · The Contractor shall remove the stagnant water accumulated in the drip trays near bar bending area and DP6. · The Contractor shall designate an area for concrete truck washing to avoid discharge of wash-water to surrounding water bodies. · The Contractor shall remove the general refuse accumulated near future guardhouse, X9b channel, future weighmaster house, vehicle washing facilities, bar bending area and future maintenance building and dispose of the waste regularly to minimize odour and pest issues.
3 June 2021	· The Contractor shall provide drip tray for the chemical stored near future weighmaster house and remove the stagnant water accumulated in the drip tray near DP6. · The Contractor shall display a NRMM label on the roller near future vehicle washing facilities. · The Contractor shall avoid accumulation of stagnant water around the site, especially near future weighmaster house, vehicle washing facilities, maintenance building, at the drains around carpark and containers at LTP, and spray larvicides for pest control, if necessary. · The Contractor shall remove the general refuse accumulated near container area and dispose of the waste regularly to minimize odour and pest issues.
10 June 2021	· The Contractor shall remove the stagnant water accumulated in the drip tray neat LTP. · The Contractor shall avoid accumulation of stagnant water around the site, especially at X9b channel and near future vehicle washing facilities, and spray larvicides for pest control, if necessary. · The Contractor shall remove the general refuse accumulated at X9b channel, near future weighmaster house, vehicle washing facilities and LTP and dispose of the waste regularly. · The Contractor shall ensure that all surface water collected at DP6 is treated by the Wetsep before discharge.
17 June 2021	· The Contractor shall store the emptied chemical containers near site entrance in the chemical waste cabinet properly. · The Contractor shall fix the signage of the chemical waste cabinet to ensure compliance with the COP. · The Contractor shall remove the general refuse accumulated in the skip near existing vehicle washing facilities, container area near site entrance and future vehicle washing facilities and dispose of the waste regularly to minimise odour and pest issues.
24 June 2021	· The Contractor shall ensure that all surface water at DP4T and DP6 is treated before discharge and the Wetseps are functioning properly at all times. · The Contractor shall clean up the oil spill at the generator near future vehicle washing facilities ad handle the clean-up materials as chemical waste. · The Contractor shall provide drip tray for the chemical stored near future weighbridge. · The Contractor shall regulate the water flow from the Wetsep outlet near DP4T to ensure all water is treated by the oil interceptor before discharge. · The Contractor shall ensure that all trucks leaving the site shall pass through the wheel washing facilities at the site exit to keep the public road clear of dusty materials. · The Contractor shall label the chemical waste stored in the chemical waste cabinet in accordance with the COP and arrange chemical waste collection regularly. · The Contractor shall remove the general refuse accumulated near the container area near site entrance, future vehicle washing facilities and future maintenance building and dispose of the waste regularly to minimise odour and pest issues. · The Contractor shall display a NRMM label on the generator near future vehicle washing facilities.
2 July 2021	· The Contractor shall provide drip tray for the chemical stored near future weighmaster house. · The Contractor shall remove the stagnant water accumulated in the drip tray near future maintenance building. · The Contractor shall remove the general refuse accumulated near the container area near site entrance, skip near vehicle washing facilities and future maintenance building and dispose of the waste regularly. · The Contractor shall maintain the signage of the chemical waste cabinet near site entrance to ensure compliance with the COP.
8 July 2021	· The Contractor shall enhance watering around the site, especially near demolition area and main haul road. · The Contractor shall provide drip tray for the chemical stored near future guard house. · The Contractor shall remove the general refuse accumulated at DP4T and near future vehicle washing facilities and dispose of the waste regularly.
15 July 2021	· The Contractor shall enhance watering around the site, especially near demolition area. · The Contractor shall provide drip tray for the chemical stored near Paul Y container area. · The Contractor shall remove the general refuse accumulated near site entrance and future maintenance building and dispose of the waste regularly.
22 July 2021	· The Contractor shall remove the general refuse accumulated near existing LFG plant and site entrance and dispose of the waste regularly.
29 July 2021	· The Contractor shall provide and replace the NRMM labels on the excavators near demolition area, existing LFG plant, DP4T and on the cherry picker near LTP. · The Contractor shall avoid accumulation of stagnant water at LTP and spray larvicides for mosquito control, if necessary. · The Contractor shall remove the general refuse accumulated along EVA and future VWF and dispose of the waste regularly to minimise odour and pest issues.
2 August 2021	· The Contractor shall ensure that all surface water at the sediment trap is treated by the Wetsep before discharge and the Wetsep is functioning properly at all times. · The Contractor shall remove the stagnant water accumulated near DP4T refuse skip and LFG4 and spray larvicides for mosquito control, if necessary. · The Contractor shall regulate the water flow from the Wetsep outlet near DP4T to ensure that all water is treated by the oil interceptor before discharge. · The Contractor shall maintain the signage and lock of the chemical waste cabinet in accordance with the COP and remove the stagnant water accumulated in the chemical waste cabinet. · The Contractor shall remove the general refuse accumulated near existing LFG plant and dispose of the waste regularly.
12 August 2021	· The Contractor shall maintain the concrete washing area and remove the concrete residue regularly, to ensure all wash-water is properly contained. · The Contractor shall remove the stagnant water accumulated in the drip trays near demolition area, future weighbridge, maintenance building and DP6. · The Contractor shall provide drip trays for the generator near sump house 2 and chemicals stored near fire services house and DP6. · The Contractor shall provide and replace the NRMM labels on the roller near demolition area and generators near Cell 2X and future weighbridge, respectively. · The Contractor shall regulate the water flow from the Wetsep outlet near DP4T to ensure that all water is treated by the oil interceptor before discharge. · The Contractor shall enhance watering at the demolition area and ensure that the dusty materials are wet prior to loading and transfer operation.
19 August 2021	· The Contractor shall provide drip tray for the chemical stored near EPD building. · The Contractor shall remove the stagnant water accumulated in the chemical waste cabinet near site entrance and maintain the signage in accordance with the COP.
26 August 2021	· The Contractor shall clean up the oil spillage at the cherry picker near future weighbridge and handle the clean-up materials as chemical waste. · The Contractor shall remove the general refuse accumulated near existing LFG plant, resting area near FS building and refuse skip near DP6 and dispose of the waste regularly to minimise odour and pest issues. · The Contractor shall enhance watering around the site, especially during any loading, uploading and breaking operations at the demolition area. · The Contractor shall maintain the generator near GVL building to avoid any smoke emission. · The Contractor shall replace the NRMM label displayed on the roller at demolition area in accordance with the regulation.
2 September 2021	· The Contractor shall ensure that the wheel washing facilities are functioning properly at all times and all trucks shall pass through the wheel wash before leaving the site. The Contractor shall remove the deposited silt and grit accumulated at the wheel washing bay and site exit regularly and ensure that the wash-water is treated before discharge. · The Contractor shall remove the concrete residue at the concrete truck washing area near site entrance and DP4T regularly to avoid overflow of wash-water to the surface water channel. · The Contractor shall replace the faded NRMM label displayed on the generator at new container area. · The Contractor shall maintain the Wetsep near DP4T and sediment trap to ensure they are functioning properly at all times and all surface water shall be treated before discharge. · The Contractor shall provide drip trays for the chemicals stored near site entrance and at new container area. · The Contractor shall remove the stagnant water accumulated in the drip trays near southern bund and maintenance building. · The Contractor shall remove the general refuse accumulated near site entrance and at new container area and dispose of the waste regularly to minimise odour and pest issues.
9 September 2021	· The Contractor shall replace the faded NRMM labels displayed on the generators near GVL building and DP6. · The Contractor shall remove the deposited silt and grit accumulated at the surface water channels, especially DP6 channel and at the sedimentation tank near DP4T regularly to ensure they are functioning properly at all times. · The Contractor shall review the piping at DP4T Wetsep outlet to ensure that all surface water is treated by the oil interceptor before discharge. · The Contractor shall remove the stagnant water/ chemical accumulated in the drip tray near maintenance building and treat the clean-up materials as chemical waste. · The Contractor shall maintain the wheel washing facilities and remove the deposited silt and grit accumulated at the wheel washing bay regularly to ensure the facilities are functioning properly and all wash-water is treated before discharge. · The Contractor shall remove the general refuse accumulated near site entrance and dispose of the waste regularly to minimise odour and pest issues.
16 September 2021	· The Contractor shall display a NRMM label on the generator near sump house 3. · The Contractor shall provide drip trays for the chemicals stored near maintenance building and at the evacuated container area. · The Contractor shall remove the general refuse accumulated near welfare facilities work area and dispose of the waste regularly to minimise odour and pest issues.
23 September 2021	· The Contractor shall maintain the Wetseps near DP4T and sediment trap to ensure they are functioning properly and all surface water is treated before discharge. The Contractor shall consider providing additional Wetseps to ensure sufficient treatment capacity and avoid overflow of the Wetsep. · The Contractor shall review the piping at DP4T Wetsep outlet to ensure that all surface water is treated by the oil interceptor before discharge. · The Contractor shall clean up the oil spillage and stagnant water at the drip trays near site entrance, sediment trap, new container area and in the chemical waste cabinet and treat the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemical stored at new container area and near maintenance building. · The Contractor shall provide a designated concrete truck washing area to ensure that all wash-water is properly contained and treated before discharge. · The Contractor shall maintain the site drainage, especially at the new container area, and ensure that the untreated water accumulated at the temporary drain will not be discharged to the surrounding water body. · The Contractor shall label the chemical waste stored at the chemical waste cabinet at the new container area in accordance with the COP.
30 September 2021	· The Contractor shall display the updated CNP at the site entrance for inspection. · The Contractor shall fix the oil interceptor at DP4T Wetsep outlet to ensure that all surface water is treated by the oil interceptor before discharge. · The Contractor shall clean up the oil spillage near site entrance and at future maintenance building and treat the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemical stored near site entrance and welfare facilities. · The Contractor shall maintain the site drainage and remove the stagnant water accumulated at the temporary drain near new container area. · The Contractor shall remove the general refuse accumulated near existing LFG plant and welfare facilities and dispose of the waste regularly. · The Contractor shall trim the climbing plants around the transplanted tress near DP6 regularly.
7 October 2021	· The Contractor shall enhance watering around the site, especially at Cell4X and near existing LFG plant. · The Contractor shall provide drip trays for the chemical stored near existing LFG plant and new container area. · The Contractor shall remove the stagnant water accumulated near site entrance and spray larvicides for mosquito control, if necessary. · The Contractor shall maintain the wheel washing facilities at the site exit to ensure it is functioning properly at all times. · The Contractor shall remove the general refuse accumulated near new container area and at the temporary drains and dispose of the waste regularly.
15 October 2021	· The Contractor shall ensure that the Wetseps are functioning properly at all times and all surface water discharged at DP4T and DP6 is treated before discharge. · The Contractor shall clean up the oil spillage near DP6 and handle the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemicals stored near MSE wall, new container area and X9B. · The Contractor shall remove the stagnant water accumulated at the drip tray near new container area and treat the clean-up materials as chemical waste.
21 October 2021	· The Contractor shall fix the oil interceptor at DP4T Wetsep outlet to ensure that all surface water is treated by the oil interceptor before discharge. · The Contractor shall display NRMM labels on the generator near site entrance and excavator near sump house 3. · The Contractor shall remove the deposited silt and grit accumulated at DP6 regularly to ensure it is functioning properly at all times. · The Contractor shall provide drip trays for the chemicals stored at new container area and remove the stagnant water accumulated in the drip trays near Cell4X and site entrance and treat the clean-up materials as chemical waste. · The Contractor shall dispose of the emptied chemical container in the refuse skip near DP4T as chemical waste in the chemical waste cabinet. · The Contractor shall remove the general refuse accumulated near site entrance and new container area and dispose of the waste regularly to minimise odour and pest issues.
28 October 2021	· The Contractor shall fix the oil interceptor at DP4T Wetsep outlet to ensure that all surface water is treated by the oil interceptor before discharge. · The Contractor shall clean up the oil spillage near site entrance and existing LFG plant and handle the clean-up materials as chemical waste. · The Contractor shall provide proper drip trays for the chemicals stored at new container area and LTP and the generator near EPD building. The Contractor shall also remove the stagnant water accumulated in the drip trays near sump house 2 and EPD building and treat the clean-up materials as chemical waste. · The Contractor shall maintain the signage of the chemical waste cabinet at new container area in accordance with the COP. · The Contractor shall remove the general refuse accumulated around the site, especially near DP4T Wetsep, guardhouse and EPD building and dispose of the waste regularly to minimise odour and pest issues.
4 November 2021	· The Contractor shall replace the faded NRMM label displayed on the cherry picker near future weighbridge. · The Contractor shall maintain site drainage and remove the stagnant water and algae accumulated at the temporary drain at new container area and spray larvicides for mosquito control, if necessary. · The Contractor shall clean up the oil spillage at Southern perimeter bund and near EPD building and handle the clean-up materials as chemical waste. · The Contractor shall remove the concrete residue at the concrete truck washing area to ensure that all wash-water is properly contained. · The Contractor shall maintain the signage of the chemical waste cabinet at new container area in accordance with the COP. · The Contractor shall dispose of the emptied chemical containers near EPD building as chemical waste. · The Contractor shall remove the general refuse accumulated at new container area and dispose of the waste regularly to minimise odour and pest issues.
11 November 2021	· The Contractor shall spray water on the surface continuously during rock breaking operation at the buttress wall to minimise dust impact. · The Contractor shall cover the cement stored at new container area to minimise dust impact. · The Contractor shall clean up the oil spillage at the breaker near future guardhouse and at the EVA and handle the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemicals stored near buttress wall. · The Contractor shall maintain the signage of the chemical waste cabinet at new container area in accordance with the COP.
17 November 2021	· The Contractor shall clean up the oil spillage at the breaker near town gas plant and handle the clean-up materials as chemical waste. · The Contractor shall remove the stagnant water accumulated at the drip tray near DP6 and treat the clean-up material as chemical waste. · The Contractor shall remove the general refuse accumulated near DP4T, main haul road, weighbridge, town gas plant, drainage channel near maintenance building and DP6.
26 November 2021	· The Contractor shall clean up the oil/ chemical spillage at the generator near DP6 and handle the clean-up materials as chemical waste. · The Contractor shall provide drip trays for the chemicals stored near guardhouse and sediment trap. · The Contractor shall dispose of the waste accumulated at the refuse skips near DP4T and DP6 regularly to minimise odour and pest issues.
2 December 2021	· The Contractor shall clean up the oil spillage at sediment trap and handle the clean-up materials as chemical waste. · The Contractor shall trim the climbing plants around the transplanted trees near DP6 regularly.
9 December 2021	· The Contractor shall provide drip trays for the chemicals stored near EPD building, diesel fuel tank and at Cell 1X slope. · The Contractor shall provide drip trays for the chemicals stored near EPD building, diesel fuel tank and at Cell 1X slope.
16 December 2021	· The Contractor shall replace the faded NRMM labels displayed on the excavators near Cell 4X and EPD building. · The Contractor shall remove the general refuse accumulated near town gas plant and at the sediment trap and dispose of the waste regularly.
23 December 2021	· The Contractor shall replace the faded NRMM label displayed on the excavator near Cell 4X. · The Contractor shall remove the general refuse accumulated near water services house and dispose of the waste regularly. · The Contractor shall cover/ remove the stockpile of dusty materials near EPD building to minimise dust impact.
30 December 2021	· The Contractor shall clean up the oil spillage at the generators near GVL building and handle the clean-up materials as chemical waste. · The Contractor shall remove the general refuse accumulated in the refuse skip near LTP regularly to minimise odour and pest issues. · The Contractor shall remove the stagnant water accumulated at the channel near sump house 3 and spray larvicides for mosquito control, if necessary.

The Contractor has rectified all of the observations identified during environmental site inspections in the reporting period. Key environmental deficiencies identified and the corresponding rectification actions are presented in Table 2.33.

Table 2.33 Summary of Environmental Deficiencies Identified and Corresponding Additional Control Measures

Deficiencies	Rectifications Implemented	Proposed Additional Control Measures
Surface Water
Intercepting channels & drainage system	Ÿ Reviewed drainage plan.	Ÿ Provision of additional drainage channels. Ÿ Expedite the construction of permanent sediment trap and discharge culverts.
DP channels (design & regular silt removal)	Ÿ Carried out regular maintenance and cleaning of channels. Ÿ DP4 channel: Area near the channel was paved with concrete and a bund was built. Ÿ DP6 channel: Gravel piles on the channel were covered with concrete which serve as blocks for running water and to divide the channel into several sections. A pump was placed in the water zone in the upstream section to pump water to the Wetsep for treatment prior to the discharge to the last section before the weir plate. Ÿ DP6: Pipes through the gravel piles between different channel sections were covered with geotextiles to block debris and silt.	N.A.
Stockpiles & exposed soil	Ÿ Installed silt fencing near surface water channel along DP6 channel.	Ÿ Improve soil covering. Ÿ Compaction and cover for stockpiles and soil slopes.
Wetsep (treatment capacity & number)	Ÿ Reviewed Wetsep capacity. Ÿ Chemicals dosage of the Wetsep was increased to enhance the efficiency.	Ÿ Install additional Wetsep.
Backflow / ponding during heavy rainfall	Ÿ Raised with EPD (LDG) and CEDD.	N.A.

2.7 Waste Management Status

The Contractor has registered as a chemical waste producer under the Contract. Sufficient numbers of receptacles were available for general refuse collection and sorting.

As informed by the Contractor, waste generated during this reporting period include mainly inert C&D materials. Reference has been made to the waste flow table prepared by the Contractor. The quantities of different types of wastes and imported fill materials are summarised in Table 2.34.

Table 2.34 Quantities of Different Waste Disposed and Imported Fill Materials

Month/ Year	Inert C&D Materials ^(a) (in ‘000m³)	Imported Fill (in ‘000kg)^(b)		Inert Construction Waste Re-used (in ‘000m³)	Non-inert Construction Waste ^(c) (in ‘000m³)	Recyclable Materials ^(d) (in ‘000kg)	Yard Waste (in ‘000kg)	Chemical Wastes (in ‘000kg)
Month/ Year	Inert C&D Materials ^(a) (in ‘000m³)	Rock	Soil	Inert Construction Waste Re-used (in ‘000m³)	Non-inert Construction Waste ^(c) (in ‘000m³)	Recyclable Materials ^(d) (in ‘000kg)		Chemical Wastes (in ‘000kg)
Jan 2021	0.297	0	0	0	0.090	0.090	0	0
Feb 2021	1.584	0	0	0	0.061	0	0	0.086
Mar 2021	0.875	0	0	0	0.100	0	0	0
Apr 2021	0.829	0	0	0	0.118	0	0	0
May 2021	0.257	0	0	0	0.096	0.100	0	0
Jun 2021	3.990	0	0	0	0.083	151.970	0	0
Jul 2021	3.526	0	0	0	0.220	417.120	96.000	0.110
Aug 2021	1.440	0	0	0	0.057	505.180	0	0
Sep 2021	5.392	0	0	0	0.397	782.600	86.100	14.800
Oct 2021	0.710	0	1912.010	0	0.053	0	0	0
Nov 2021	3.152	0	1378.680	0	0.121	222.310	0	0
Dec 2021	0.412	0	2043.810	0	0.058	11.660	0	0.800
Notes: (a) Inert construction wastes include hard rock and large broken concrete, and materials disposed as public fill. Density assumption: 1.6 (kg/L) for public fill. (b) Imported fill refers to materials generated from other project for on-site reuse. (c) Non-inert construction wastes include general refuse disposed at landfill. Density assumption: 0.9 (kg/L) for general refuse. (d) Recyclable materials include metals, paper, cardboard, plastics and others.

2.8 Implementation Status of Environmental Mitigation Measures

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

2.9 Summary of Exceedances of the Environmental Quality Performance Limit

The construction and operation/ restoration phase noise and landfill gas monitoring results complied with the Action and Limit Levels in the reporting period. One exceedance of the Limit Level for TSP and one exceedance of the Limit Level for landfill gas flare stack emission (CO) were recorded for air quality impact monitoring in the reporting period. The TSP exceedance at AM4 on 13 December 2021 was considered non Project-related upon further investigation. The landfill gas flare stack emission (CO) exceedance on 17 December 2021 was found to be Project-related.

One exceedance of the Limit Level for DO, five exceedances of the Limit Level for pH and four exceedances of the Limit Level for SS were recorded for surface water quality impact monitoring in the reporting period. The DO, pH and SS exceedances were found deemed to Project-related activities.

One exceedance of the Limit Level for groundwater (COD) was recorded for water quality impact monitoring in the reporting period. The groundwater (COD) exceedance at MWX-6 on 8 December 2021 was considered non Project-related upon further investigation.

Cumulative statistics on exceedances is provided in Annex H.

2.10 Summary of Complaints, Notification of Summons and Successful Prosecutions

There were no complaints, notification of summons or prosecution recorded in the reporting period.

Statistics on complaints, notifications of summons and successful prosecutions are summarised in Annex H.

3 Conclusion and Recommendation

This Annual EM&A Report presents the findings of the EM&A activities undertaken during the period from 1 January to 31 December 2021 in accordance with the updated EM&A Manual and the requirements of the Environmental Permit (EP-308/2008/B).

Air quality (24-hour TSP, odour, thermal oxidiser, landfill gas flare and landfill gas generator stack emission), noise, water quality (surface water, leachate and groundwater) and landfill gas monitoring were carried out in the reporting period. Results for noise and landfill gas monitoring complied with the Action and Limit Levels in the reporting period. One exceedance of the Limit Level for DO, five exceedances of the Limit Level for pH, four exceedances of the Limit Level for SS, one exceedance of the Limit Level for TSP, one exceedance of the Limit Level for landfill gas flare stack emission (CO) and one exceedance of the Limit Level for groundwater (COD) were recorded in the reporting period.

Fifty-one environmental site inspections were carried out during the reporting period. Environmental deficiencies were identified during the site inspection and the Contractor has proposed additional control measures to rectify the deficiencies.

There were no complaints, notification of summons or prosecution recorded in the reporting period.

It is noted that most environmental pollution control and mitigation measures were properly implemented and the construction and operation activities of the Project did not introduce any adverse impact to the sensitive receivers in the reporting period. Yet, some environmental deficiencies were identified during the reporting period and additional control measures have been proposed by the Contractor to rectify the corresponding deficiencies. The monitoring programme has been reviewed and was considered as adequate to cater for the nature of works in progress. Change to the monitoring programme was thus not recommended at this stage. The monitoring programme will be evaluated as appropriate in the next reporting period. The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

([1]) ERM (2018). South East New Territories (SENT) Landfill Extension: Environmental Monitoring & Audit Manual

([2]) ERM (2007). South East New Territories (SENT) Landfill Extension – Feasibility Study: Environmental Impact Assessment Report