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 Monthly EM&A report presents the EM&A works carried out during the period from 1 to 30 November 2021 for the Project in accordance with the updated EM&A Manual.

Exceedance of Action and Limit Levels for Air Quality

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

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

No exceedance of Action and Limit Levels for construction and operation/ restoration phase water quality 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.

Future Key Issues

Potential environmental impacts arising from the upcoming construction/ operational activities in the next reporting period of December 2021 are mainly associated with dust emission from the exposed area and loading and unloading operation of dusty materials.

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 Monthly EM&A Report for the Project which summarises the key findings of the EM&A programme during the reporting period from 1 to 30 November 2021 for the construction 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 summarised 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
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:

· Follow up on civil provision work detects at Landfill Gas (LFG) Plant, Leachate Treatment 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.

The implementation schedule of the mitigation measured 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 surface 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
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/ Operation 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 and waste management were carried out in the reporting period. The impact monitoring schedule of air quality, noise and water quality 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 One environmental management meeting was held with the Contractor, ER, ET, IEC and EPD on 26 November 2021; and

Ÿ Environmental toolbox trainings on Trip Ticket System and Illegal Dumping were provided on 10 November and 23 November 2021 respectively by the Contractor to the workers.

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 mitigation measures are presented in Table 1.4.

Table 1.4 Status of Submissions required under the EP and Implementation Status of 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-RE0990-21	Validity from 6 October 2021 to 5 April 2022
Construction Noise Permit (Permit Holder: Chun Wo)	GW-RE0564-21	Validity from 7 June 2021 to 6 December 2021

2 EM&A Results

The EM&A programme for the Project required environmental monitoring for air quality, noise and water quality as well as environmental site inspections for air quality, noise, water quality, 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 dust monitoring (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 dust 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 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 dust monitoring programme and monitoring locations are summarised in Table 2.2 and illustrated in Figure 2.1 respectively. Copies of the calibration certificates for the equipment are presented in Annex D1.

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	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	2, 8, 14, 20 November 2021	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	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 Month

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

Results and Observations

The monitoring results for 24-hour TSP are summarised in Table 2.3. The detailed monitoring results and the graphical presentation of the 24-hour TSP results at each monitoring location are provided in Annex D2.

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

Monitoring Station	Average 24-hr TSP Concentration (µg m^-3) (Range in bracket)	Action Level (µg/m³)	Limit Level (µg/m³)
Construction Phase
DM-1 – Site Egress of TKO Area 137 Fill Bank	101 (94 - 109)	204	260
DM-2A –Combined Reception and Exit Office (CREO) of TKO Area 137 Fill Bank	91 (86 – 197)	193	260
Operation/ Restoration Phase
AM1 - SENTX Site Boundary (North)	100	260	260
AM2 - SENTX Site Boundary (West, near DP3)	154	260	260
AM3 - SENTX Site Boundary (West, near RC15)	158	260	260
AM4 - SENTX Site Boundary (West, near EPD building)	235	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 existing SENT landfill and the TKO Area 137 Fill Bank.

All the 24-hour TSP results were below the Action and Limit Levels at the monitoring locations in the reporting period. No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex D3.

Meteorological Data

Meteorological data obtained from the SENTX on-site meteorological monitoring station was used for the dust monitoring and is shown in Annex D4. 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. Copies of the certificates of the qualified odour panelist are presented in Annex D5.

Table 2.5 Odour Monitoring Details

Patrol Locations	Parameters	Patrol Frequency ^(a)	Monitoring Dates and Time
Patrol along the SENTX Site Boundary (Checkpoints OP1 – OP10)	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 (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)
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.

Patrol Locations

Parameters

Patrol Frequency ^(a)

Monitoring Dates and Time

Patrol along the SENTX Site Boundary (Checkpoints OP1 – OP10)

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

(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)

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.

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 D6, 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
OP6	0
OP7	0 – 1
OP8	0 – 1
OP9	0 – 1
OP10	0

The potential odour sources in the reporting period included the operation of leachate treatment plant, generator, slurry truck 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 D3.

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 2.8 below.

Table 2.8 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 sound level meter 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 2.9. Copies of the calibration certificates for the equipment are presented in Annex E1.

Table 2.9 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 of the Project	4, 11, 18, 25 November 2021	Sound Level Meter: B&K 2238 (S/N: 2285721) Rion NL-31 (S/N: 00410221) Acoustic Calibrator: Rion NC-74 (S/N: 34657230) Rion NC-75 (S/N: 34680623)

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 of the Project

4, 11, 18, 25 November 2021

Sound Level Meter:

B&K 2238 (S/N: 2285721)

Rion NL-31 (S/N: 00410221)

Acoustic Calibrator:

Rion NC-74 (S/N: 34657230)

Rion NC-75 (S/N: 34680623)

2.2.2 Monitoring Schedule for the Reporting Month

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

2.2.3 Results and Observations

A total of 4 impact noise monitoring events were scheduled during the reporting period. Results for noise monitoring are summarised in Table 2.10. The monitoring results and the graphical presentation of the data are provided in Annex E2.

Table 2.10 Summary of Construction/ Operation Noise Monitoring Results in the Reporting Period

Monitoring Station	Measured Noise Level L_eq_{(30 min)}, dB(A)
Monitoring Station	Average	Range	Action and Limit Level
NM1	51.4	49.0 – 53.4	75

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

No Action and Limit Levels exceedance was recorded for construction/ operation noise monitoring in the reporting period. No action is thus required to be undertaken in accordance with the Event and Action Plan presented in Annex E3.

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 was 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. 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 2021.

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 2.11.

Table 2.11 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 2.12. Copies of the calibration certificates for the equipment are presented in Annex F1.

Table 2.12 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	4, 11, 18 November 2021	•pH •DO •SS		YSI Professional DSS (S/N: 15H103928)
DP6	Surface water discharge point DP6	Weekly	4, 11, 18 November 2021	•pH •DO •SS		YSI Professional DSS (S/N: 15H103928)
Operation/ Restoration Phase:
DP4 (Future, temporary)	Surface water discharge point DP4	Monthly	25 November 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)
DP6	Surface water discharge point DP6	Monthly	25 November 2021			YSI Professional DSS (S/N: 15H103928)
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 2021.

Monitoring Schedule for the Reporting Month

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

Results and Observations

A total of 4 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 on 4, 18 and 25 November 2021 due to insufficient flow. Impact surface water quality monitoring results and graphical presentations are provided in Annex F2.

All the surface water 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 F3.

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 2.14 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 2.13.

Table 2.13 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
Ammoniacal-nitrogen	> 100 mg/L
Nitrite-nitrogen	> 100 mg/L
Phosphate	> 25 mg/L
Sulphate	> 900 mg/L
Nitrate-nitrogen	> 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

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 2.14. Copies of the calibration certificates for the equipment are presented in Annex F4.

Table 2.14 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	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	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 in Table 2.15 and Table 2.16, respectively. The detailed monitoring results are provided in Annex F5 and Annex F6, respectively.

Table 2.15 Summary of Leachate Levels in the Reporting Period

Monitoring Location	Average Leachate Head Levels (cm) (Range in Bracket)	Limit Level (cm)
Pump Station No. 1X (Cell 1X)
Meter No. X-1	61 (44 – 79)	> 178
Meter No. X-2	81 (64 – 99)
Average	71 (54 – 89)

Table 2.16 Summary of Effluent Quality Monitoring Results in the Reporting Period

Parameters	Average Monitoring Results (Range in Bracket)	Limit Level
Effluent Discharged from LTP
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
Ammoniacal-nitrogen	0.40mg/L (0.28mg/L – 0.84mg/L)	> 100 mg/L
Nitrite-nitrogen	0.20mg/L (0.04mg/L – 0.63mg/L)	> 100 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
Nitrate-nitrogen	60.8mg/L (46.4mg/L – 69.6mg/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

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 F3.

2.4 Landscape and Visual Monitoring

2.4.1 Monitoring Requirements

According to the updated EM&A Manual of the Project, the monthly landscape and visual audit was conducted on 19 November 2021 to monitor the implementation of the landscape and visual mitigation measures during construction 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.

2.4.2 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 shall consider the mitigation measures during the design phase, including the preparation of the Construction Drawings and Detailed Landscape Design Drawings.

2.5 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 under the Project. In the reporting period, 4 site inspections were carried out on 4, 11, 17 and 26 November 2021.

Key observations during the site inspections are summarised in Table 2.17.

Table 2.17 Key Observations Identified during the Site Inspection in this Reporting Month

Inspection Date	Environmental Observations and Recommendations
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.

The Contractor has rectified all observations identified during environmental site inspections in the reporting period. Key environmental deficiencies identified and the corresponding rectification actions are presented in Table 2.18.

Table 2.18 Summary of Environmental Deficiencies Identified and Corresponding Rectification Actions

Deficiencies	Rectifications Implemented	Proposed Additional Control Measures
Surface Water
Intercepting channels & drainage system	Ÿ Reviewed drainage plan.	Ÿ Addition of 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.

2.6 Waste Management Status

The Contractor has registered as 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 2.19.

Table 2.19 Quantities of Different Waste Generated 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)
		Rock	Soil
1 – 30 Nov 2021	3.152	0	1378.680	0	0.121	222.310	0	2.800
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.

2.7 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.

2.8 Summary of Exceedances of the Environmental Quality Performance Limit

The construction and operation/ restoration phase air quality, noise and water quality monitoring results complied with the Action and Limit Levels in the reporting period.

Cumulative statistics on exceedances is provided in Annex G.

2.9 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, successful prosecutions are summarised in Annex G.

3 Future Key Issues

3.1 Construction Programme for the Coming Month

As informed by the Contractor, the major works for the Project in December 2021 will be:

Ÿ Excavation and removal of unsuitable fill materials;

Ÿ Import materials for Cell 4X;

Ÿ Construction of Cell 4X formation;

Ÿ Installation of groundwater pipes for Cell 4X;

Ÿ Liner works at Cell 4X;

Ÿ Defects rectification for waste reception area, including weighbridge, vehicle washing facilities, wheel wash bay and guard house;

Ÿ Defects rectification for infrastructure buildings;

Ÿ Defects rectification for pavement works at Part X1 area;

Ÿ Defects rectification for surface water channels along the road pavement;

Ÿ Installation of the remaining LFG and leachate HDPE pipes at Cell 3X and Cell 4X;

Ÿ Finish off equipment installation for sump houses 1, 2 and 3;

Ÿ Construction of MSE wall; and

Ÿ Landscape work.

3.2 Key Issues for the Coming Month

Potential environmental impacts arising from the above upcoming construction activities in the next reporting period of December 2021 are mainly associated with dust emission from the exposed area and loading and unloading operation of dusty materials. The ET will keep track on the construction works to confirm compliance of environmental requirements and the proper implementation of all necessary mitigation measures.

3.3 Monitoring Schedule for the Coming Month

The tentative schedules for environmental monitoring in December 2021 are provided in Annex H.

4 Conclusion and Recommendation

This EM&A Report presents the findings of the EM&A activities undertaken during the period from 1 to 30 November 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 and odour), noise and water quality (surface water and leachate) monitoring were carried out in the reporting period. Results for air quality, noise and water quality monitoring complied with the Action and Limit Levels in the reporting period. No Action and Limit Levels exceedances were recorded in the reporting period.

Environmental site inspections were carried out during the reporting period. Recommendations on remedial actions were given to the Contractor for the deficiencies identified during the site inspections.

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

The ET will keep track on the construction and operation/restoration 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