The construction works of No. EP/SP/61/10 Organic Resources Recovery Centre Phase 1 (the Project) commenced on 21 May 2015. This is the 25^thquarterly Environmental Monitoring and Audit (EM&A) report presenting the EM&A works carried out during the period from 1 June 2021 to 31 August 2021 in accordance with the EM&A Manual. Substantial completion of the construction works was confirmed on 3 December 2018. In the meantime, the operation phase EM&A programme had commenced in March 2019. Substantial Completion in respect of substantial part of the Works was confirmed on 24 February 2020. The construction phase EM&A programme was completed in the end of February 2020.

Summary of Works undertaken during the Reporting Month

Works undertaken in the reporting month included:

· Operation of the Project, including organic waste reception, and operation of the pre-treatment facilities, anaerobic digesters, composting facilities, air pollution control systems, on-line emission monitoring system for the Centralised Air Pollution Control Unit (CAPCS), Co-generation Units (CHP)s and Ammonia Stripping Plant (ASP), and the wastewater treatment plant; and

· Process fine-tune, including adjustment of the ASP with new treatment media, modification of Continuous Environmental Monitoring System (CEMS) and Supervisory Control and Data Acquisition System (SCADA) rectification and improvement works following equipment failures and the alteration of different operation modes and measures to adapt to the high variation of SSOW nature and sources.

Environmental Monitoring and Audit Progress

Air Quality Monitoring

Exceedances on NO_x, SO₂, VOC and HF from CHP and CO, NO_x and NH₃ from ASP were recorded on the on-line monitoring system in June 2021. Exceedances on NOx, SO2 and VOCs from CHP and CO, NOx, SO2, VOCs, NH3, HCl and HF from ASP were recorded on the on-line monitoring system in July 2021. Exceedances on NOx and SO₂ from CHP and NO_x, SO₂, VOCs and NH₃ from ASP were recorded on the on-line monitoring system in August 2021. It should be noted that measurements recorded under abnormal operating conditions, e.g. start up and stopping of stacks, unstable operation, test runs and interference of sensor, are disregarded.

In June 2021, exceedances in emission parameters of CHP were found to be a result of low biogas loading and unstable performance at CHP. The exceedances of ASP were found to be a result of incomplete combustion of biogas at ASP in June. In July, exceedances in emission parameters of CHP were found to be a result of low biogas loading and hence led to unstable performance at CHP. The exceedances of ASP were found to be a result of unstable conditions in the column and the thermal oxidiser of the ASP. In August, the exceedances in NOx of CHP were found to be a result of the low biogas loading at the CHPs and the unstable condition of CHP1. The exceedances of SO₂ of CHPs and the ASP were found to be a result of the tripping of the desulphurisation system. The exceedances of ASP were found to be result of unstable condition at the thermal destructor of the ASP.

The Contractor has implemented mitigation measures to control the exceedance (including arranging for the supplier of CHP to perform on-site adjustment to improve CHP performance and tuning the thermal combustion unit of the ASP to optimise combustion efficiency and overall performance).

The Contractor is recommended to closely monitor the processes of the modification of the ASP and the post-modification monitoring of emission level to avoid any exceedance.

As similar issues have been re-occurred for sometimes, the Contractor is advised to undertake a comprehensive review of the operation of the concerned systems and the effectiveness of the existing mitigation measures and proposed further measures to avoid the exceedance.

Odour

Odour patrols were conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 9 July and 9 August 2021. No Level 2 Odour Intensity was recorded during odour patrols.

Water Quality

No non-compliance to the effluent discharge limit stipulated in the discharge licence issued by the EPD under the Water Pollution Control Ordinance was recorded during this reporting period.

Waste Management

Waste generated from the operation of the Project includes chemical waste, waste generated from pre-treatment process and general refuse.

3,420 L of chemical waste was collected by licenced waste collector from the operation of the Project.

1,658.51 tonnes of waste generated from pre-treatment process from the operation of the Project was disposed of at landfill. Among the recyclable waste generated from pre-treatment process from the operation of the Project, 0.00 tonnes of metals, 0.00 tonnes of papers/ cardboard packing and 0.00 tonnes of plastics were sent to recyclers for recycling during the reporting period.

Around 8.88 tonnes of general refuse from the operation of the Project was disposed of at landfill. Among the recycled general refuse from the operation of the Project, 0.00 tonnes of metals, 0.00 tonnes of papers/ cardboard packing and 0.00 tonnes of plastics were sent to recyclers for recycling during the reporting period.

Findings of Environmental Site Audit

A summary of the monitoring activities undertaken in this reporting period is listed below:

· Joint Environmental Site Inspections	3 times
· Landscape & Visual Inspections	3 times

Monthly joint environmental site inspections were carried out. The environmental control/ mitigation measures (related to air quality, water quality, waste (including land contamination prevention), hazard-to-life and landscape and visual) recommended in the approved EIA Report and the EM&A Manual were properly implemented by the Contractor during the reporting month.

Environmental Exceedance/Non-conformance/Compliant/Summons and Prosecution

Exceedances for the air emission limits for the CHP and ASP stacks were recorded during the reporting period.

No complaint/ summon/prosecution was received in this reporting period.

Future Key Issues

Activities to be undertaken in the next reporting month include:

· Operation of the Project.

· Modification of the CHP and ASP to control the air emission.

1 inTroduction

ERM-Hong Kong, Limited (ERM) was appointed by OSCAR Bioenergy Joint Venture (the Contractor) as the Environmental Team (ET) to undertake the construction Environmental Monitoring and Audit (EM&A) programme for the Contract No. EP/SP/61/10 of Organic Waste Treatment Facilities Phase I, which the project name has been updated to Organic Resources Recovery Centre (Phase I) (the Project) since November 2017. ERM was also appointed by the Contractor to undertake the operation EM&A programme starting 1 March 2019.

1.1 Purpose of the Report

This is the 25^th Quarterly EM&A report which summarises the monitoring results and audit findings for the EM&A programme during the reporting period from 1 June 2021 to 31 August 2021.

1.2 Structure of the Report

The structure of the report is as follows:

Section 1: Introduction

It details the scope and structure of the report.

Section 2: Project Information

It summarises the background and scope of the Project, site description, project organisation and status of the Environmental Permits (EP)/licences.

Section 3: Environmental Monitoring and Audit Requirements

It summarises the environmental monitoring requirements including monitoring parameters, programmes, methodologies, frequency, locations, Action and Limit Levels, Event/Action Plans, as well as environmental audit requirements as recommended in the EM&A Manual and approved EIA report.

Section 4: Monitoring Results

It summarises monitoring results of the reporting period.

Section 5: Site Audit

It summarises the audit findings of the environmental as well as landscape and visual site audits undertaken within the reporting period.

Section 6: Environmental Non-conformance

It summarises any exceedance of environmental performance standard, environmental complaints and summons received within the reporting period.

Section 7: Further Key Issues

It summarises the impact forecast for the next reporting month.

Section 8: Conclusions

2 Project information

2.1 Background

The Organic Resources Recovery Centre (ORRC) Phase I development (hereinafter referred to as “the Project”) is to design, construct and operate a biological treatment facility with a capacity of about 200 tonnes per day and convert source-separated organic waste from commercial and industrial sectors (mostly food waste) into compost and biogas through proven biological treatment technologies. The location of the Project site is shown in Annex A.

The environmental acceptability of the construction and operation of the Project had been confirmed by findings of the associated Environmental Impact Assessment (EIA) Study completed in 2009. The Director of Environmental Protection (DEP) approved this EIA Report under the Environmental Impact Assessment Ordinance (EIAO) (Cap. 499) in February 2010 (Register No.: AEIAR-149/2010) (hereafter referred to as the approved EIA Report). Subsequent Report on Re-assessment on Environmental Implications and Report on Re-assessment on Hazard to Life Implications were completed in 2013, respectively.

An Environmental Permit (EP) (No. EP-395/2010) was issued by the DEP to the EPD (Project Team), the Permit Holder, on 21 June 2010 and varied on 18 March 2013 (No. EP-395/2010/A) and 21 May 2013 (No. EP-395/2010/B), respectively. The Design Build and Operate Contract for the ORRC Phase 1 (Contract No. EP/SP/61/10 Organic Resources Recovery Centre (Phase 1) (the Contract)) was awarded to SITA Waste Services Limited, ATAL Engineering Limited and Ros-Roca, Sociedad Anonima jointly trading as the OSCAR Bioenergy Joint Venture (OSCAR or the Contractor). A Further EP (No. FEP-01/395/2010/B) was issued by the DEP to the OSCAR on 16 February 2015. Variation to both EPs (Nos. EP-395/2010/B and FEP-01/395/2010/B) were made in December 2015. The latest EPs, Nos. EP-395/2010/C and FEP-01/395/2010/C, were issued by the DEP on 21 December 2015.

Under the requirements of Condition 5 of the EP (No. FEP-01/395/2010/C), an Environmental Monitoring and Audit (EM&A) programme as set out in the approved EM&A Manual (hereinafter referred to as EM&A Manual) is required to be implemented during the construction and operation of the Project. ERM-Hong Kong, Ltd (ERM) has been appointed by OSCAR as the Environmental Team (ET) for the construction phase EM&A programme and the Monitoring Team (MT) for the operation phase EM&A programme for the implementation of the EM&A programme in accordance with the requirements of the EP and the approved EM&A Manual.

The construction works commenced on 21 May 2015. The operation phase of the EM&A programme commenced on 1 March 2019 ([1]). The construction phase EM&A programme was completed in the end of February 2020.

2.2 General Site Description

The Project Site is located at Siu Ho Wan in North Lantau with an area of about 2 hectares. The layout of the Project Site is illustrated in Annex A. The facility received and treated an average of 93 to 154 tonnes of source separated organic waste per day during the reporting month.

2.3 Major Activities Undertaken

A summary of the major activities undertaken in the reporting period is shown in Table 2.1.

Table 2.1 Summary of Activities Undertaken in the Reporting Period

Activities Undertaken in the Reporting Period

· Systems being operated – waste reception, pre-treatment, CAPCS extraction, the digesters, the centrifuge, the composting tunnels, the desulphurisation, the emergency flare, the CHPs, the ASP and the biological waste water treatment plant (about 93 – 154 t/d SSOW input); and

· Process fine-tune – adjustment of the ASP operational parameters with new treatment media, CEMS/SCADA modification and improvement work following equipment failures and the alteration of different operation modes and measures to adapt to the high variation of SSOW nature and sources.

2.4 Project Organisation and Management Structure

The project organisation chart and contact details are shown in Annex B.

2.5 Status of Environmental Approval Documents

A summary of the valid permits, licences, and/or notifications on environmental protection for this Project is presented in Table 2.2.

Table 2.2 Summary of Environmental Licensing, Notification and Permit Status

Permit/ Licences/ Notification	Reference	Validity Period	Remarks
Environmental Permit	FEP-01/395/2010/C	Throughout the Contract	Permit granted on 21 December 2015
Notification of Construction Works under the Air Pollution Control (Construction Dust) Regulation	Ref No. 386715	Throughout the Contract	-
Effluent Discharge License	WT00024352-2016	3 June 2016 – 30 June 2021	Approved on 3 June 2016
Effluent Discharge License	WT00038391-2021	7 July 2021 – 30 June 2026	Approved on 7 July 2021
Chemical Waste Producer Registration	WPN 5213-961-O2231-01	Throughout the Contract	Approved on 29 April 2015
Chemical Waste Producer Registration	WPN 5213-961-O2231-02	Throughout the implementation of the Project	Approved on 10 November 2017
Waste Disposal Billing Account	Account number: 702310	Throughout the Contract	-

3 Environmental Monitoring and Audit Requirements

3.1 Environmental Monitoring

The air quality (including odour) monitoring to be carried out during the operation phase of the Project are described below. Although water quality monitoring is not required for the operation phase under the EM&A programme, there are water quality monitoring requirement under the Water Discharge Licence of the plant under the Water Pollution Control Ordinance (WPCO). As part of this EM&A programme, the monitoring results will be reviewed to check the compliance with the WPCO requirements.

3.1.1 Air Quality

According to the EM&A Manual and EP requirements, stack monitoring are required during the operation phase of the Project.

On-line monitoring (using continuous environmental monitoring system (CEMS) shall be carried out for the centralised air pollution unit (CAPCS), cogeneration units (CHP) and the ammonia stripping plant (ASP) during the operation phase. The last calibration was carried out on 15 June 2021.

The monitoring data is transmitted instantaneously to EPD (Regional Office) by telemetry system.

When the on-line monitoring for certain parameter cannot be undertaken, monitoring will be carried out using the following methodology approved by the EPD.

Table 3.1 Sampling and Laboratory Analysis Methodology

Parameters	Method	Stacks to be Monitored
Gaseous and vaporous organic substances (including methane)	USEPA Method 18	· CAPCS · CHP · ASP
Particulate	USEPA Method 5	· CAPCS · CHP · ASP
Carbon monoxide (CO)	USEPA Method 10	· CHP · ASP
Nitrogen oxides (NO_x)	USEPA Method 7E	· CHP · ASP
Sulphur dioxide (SO₂);	USEPA Method 6	· CHP · ASP
Hydrogen chloride (HCl)	USEPA Method 26A	· CHP · ASP
Hydrogen fluoride (HF)	USEPA Method 26A	· CHP · ASP
Oxygen (O₂);	USEPA Method 3A	· CAPCS · CHP · ASP
Velocity and Volumetric Flow	USEPA Method 2	· CAPCS · CHP · ASP
Ammonia (NH₃)	USEPA CTM 027	· ASP
Odour (including NH₃ and H₂S)	EN 13725	· CAPCS
Water vapour content (continuous measurement of the water vapour content should not be required if the sample exhaust gas is dried before the emissions are analysed)	USEPA Method 4	· CAPCS · CHP · ASP
Temperature	USEPA Method 4	· CAPCS · CHP · ASP

With reference to the EM&A Manual, the air emission of the stacks shall meet the following emission limits as presented in Tables 3.2 to 3.5.

Table 3.2 Emission Limit for CAPCS Stack

Parameter	Emission Level (mg/Nm³) ^(a)
VOCs (including methane)	680
Dust (or Total Suspended Particulates (TSP))	6
Odour (including NH₃ & H₂S)	220 ^(b)
Notes: (a) Hourly average concentration (b) The odour unit is OU/Nm³

Table 3.3 Emission Limit for CHP Stack

Parameter	Maximum Emission Level (mg/Nm³) ^{(a) (b)}
Dust (or Total Suspended Particulates)	15
Carbon Monoxide	650
NO_x	300
SO₂	50
NMVOCs ^(c)	150
VOCs (including methane) ^(d)	1,500
HCl	10
HF	1
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and dry basis. (b) Hourly average concentration (c) NMVOCs should be monitored by gas sampling and laboratory analysis at an agreed interval. For the first 12 months (starting from August 2019), monitoring should be carried out at quarterly intervals. The monitoring frequency should then be reduced to half-yearly for next 12 months (starting from August 2020). (d) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process.

Table 3.4 Emission Limit for ASP Stack

Parameter	Maximum Emission Level (mg/Nm³)^{(a) (b)}
Dust (or Total Suspended Particulates)	5
Carbon Monoxide	100
NOx	200
SO₂	50
VOCs (including methane) ^(c)	20
NH₃	35
HCl	10
HF	1
Notes: (a) All values refer to an oxygen content in the exhaust gas of 11% and dry basis. (b) Hourly average concentration (c) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process.

Table 3.5 Emission Limit for Standby Flaring Gas Unit ([2])

Parameter	Maximum Emission level (mg/Nm³) ^{(a) (b)}
Dust (or Total Suspended Particulates)	5
Carbon Monoxide	100
NO_x	200
SO₂	50
VOCs (including methane)^(c)	20
HCl	10
HF	1
Notes: (a) All values refer to an oxygen content in the exhaust gas of 11% and dry basis. (b) Hourly average concentration (c) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process.

3.1.2 Odour

To determine the effectiveness of the proposed odour mitigation measures and to ensure that the operation of the ORRC1 will not cause adverse odour impacts, odour monitoring of the CAPCS stack (see Section 3.1.1) and odour patrol will be carried out.

Odour patrol shall be conducted by independent trained personnel/ competent persons in summer months (i.e. from July to September) for the first two operational years of ORRC1 at monthly intervals along an odour patrol route at the Project Site boundary as shown in Annex A.

The perceived odour intensity is divided into 5 levels. Table 3.6 describes the odour intensity for different levels.

Table 3.6 Odour Intensity Level

Level	Odour Intensity
0	Not detected. No odour perceived or an odour so weak that it cannot be easily characterised or described
1	Slight identifiable odour, and slight chance to have odour nuisance
2	Moderate identifiable odour, and moderate chance to have odour nuisance
3	Strong identifiable, likely to have odour nuisance
4	Extreme severe odour, and unacceptable odour level

Table 3.7 shows the action level and limit level to be used for odour patrol. Should any exceedance of the action and limit levels occurs, actions in accordance with the event and action plan in Table 3.8 should be carried out.

Table 3.7 Action and Limit Levels for Odour Nuisance

Parameter	Action Level	Limit Level
Odour Nuisance (from odour patrol)	When one documented compliant is received ^(a), or Odour Intensity of 2 is measured from odour patrol.	Two or more documented complaints are received ^(a)within a week; or Odour intensity of 3 or above is measured from odour patrol.
Note: (a) Once the complaint is received by the Project Proponent (EPD), the Project Proponent would investigate and verify the complaint whether it is related to the potential odour emission from the ORRC1 and its on-site wastewater treatment unit.

Parameter

Action Level

Limit Level

Odour Nuisance (from odour patrol)

When one documented compliant is received ^(a), or Odour Intensity of 2 is measured from odour patrol.

Two or more documented complaints are received ^(a)within a week; or

Odour intensity of 3 or above is measured from odour patrol.

Note:

(a) Once the complaint is received by the Project Proponent (EPD), the Project Proponent would investigate and verify the complaint whether it is related to the potential odour emission from the ORRC1 and its on-site wastewater treatment unit.

Table 3.8 Event and Action Plan for Odour Monitoring

Event	Action
	Person-in-charge of Odour Monitoring	Project Proponent ^(a)
Action Level
Exceedance of action level (Odour Patrol)	1. Identify source/reason of exceedance; 2. Repeat odour patrol to confirm finding.	1. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 weeks; 2. Rectify any unacceptable practice; 3. Implement more mitigation measures if necessary; 4. Inform Drainage Services Department (DSD) or the operator of the Siu Ho Wan Sewage Treatment Works (SHWSTW) if exceedance is considered to be caused by the operation of the SHWSTW. 5. Inform North Lantau Refuse Transfer Station (NLTS) operator if exceedance is considered to be caused by the operation of NLTS.
Exceedance of action level (Odour Complaints)	1. Identify source/reason of exceedance; 2. Carry out odour patrol to determinate odour intensity.	1. Carry out investigation and verify the complaint whether it is related to potential odour emission from the nearby SHWSTW; 2. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 weeks; 3. Rectify any unacceptable practice; 4. Implement more mitigation measures if necessary; 5. Inform DSD or the operator of the SHWSTW if exceedance is considered to be caused by the operation of the SHWSTW. 6. Inform NLTS operator if exceedance is considered to be caused by the operation of NLTS.
Limit Level
Exceedance of limit level	1. Identify source/reason of exceedance; 2. Inform EPD; 3. Repeat odour patrol to confirm findings; 4. Increase odour patrol frequency to bi-weekly; 5. Assess effectiveness of remedial action and keep EPD informed of the results; 6. If exceedance stops, cease additional odour patrol.	1. Carry out investigation to identify the source/reason of exceedance. Investigation should be completed within 2 week; 2. Rectify any unacceptable practice; 3. Formulate remedial actions; 4. Ensure remedial actions properly implemented; 5. If exceedance continues, consider what more/enhanced mitigation measures should be implemented; 6. Inform DSD or the operator of the SHWSTW if exceedance is considered to be caused by the operation of the SHWSTW.
Note: (a) Project Proponent shall identify an implementation agent.

3.2 Site Audit

Environmental mitigation measures (related to air quality, water quality, waste, land contamination, hazard-to-life, and landscape and visual) to be implemented during the operation phase of the Project are recommended in the approved EIA Report and EM&A Manual and are summarised in Annex C. Monthly site audits for operation phase will be carried out to check the implementation of these measures.

3.2.1 Water Quality

Compliance audits are to be undertaken to ensure that a valid discharge licence has been issued by EPD prior to the discharge of effluent from the operation of the Project site. Under Effluent Discharge Licence WT00024352-2016 (expired in June 2021), the audit shall be conducted to ensure that the effluent quality is in compliance with the discharge licence requirements. The effluent quality shall meet the discharge limits as described in Table 3.9. Under Effluent Discharge Licence WT00038391-2021 (effective from July 2021), the effluent quality shall meet the discharge limits as described in Table 3.10 and Table 3.11.

Table 3.9 Discharge Limits for Effluent (as stipulated in WT00024352-2016)

Parameters	Discharge Limit (mg/L)
Flow Rate (m³/day)	685
pH (pH units)	6-10 ^(a)
Suspended Solids	800
Biochemical Oxygen Demand (5 days, 20°)	800
Chemical Oxygen Demand	2,000
Oil & Grease	40
Total Nitrogen	200
Total Phosphorus	50
Surfactants (total)	25
Note: (a) Range.

Table 3.10 Discharge Limits for Effluent from the Effluent Storage Tank (as stipulated in WT00038391-2021)

Parameters	Discharge Limit (mg/L)
Flow Rate (m³/day)^(a)	645
pH (pH units)^(b)	6-10 ^(c)
Suspended Solids^(b)	800
Biochemical Oxygen Demand (5 days, 20°)^(b)	800
Chemical Oxygen Demand^(b)	2,000
Oil & Grease^(b)	40
Total Nitrogen^(b)	200
Total Phosphorus^(b)	50
Surfactants (total)^(b)	25
Notes: (b) Flow rate is not a parameter required to be monitored and reported by the Contractor in accordance to Section B2 of the Effluent Discharge Licence under the WPCO. (c) Parameters required to be monitored and reported by the Contractor in accordance to Section B2 of the Effluent Discharge Licence under the WPCO. (d) Range.

Table 3.11 Discharge Limits for Effluent from the Petrol Interceptor(s) (as stipulated in WT00038391-2021)

Parameters	Discharge Limit (mg/L)
Flow Rate (m³/day)	245 ^(a)
Suspended Solids^(b)	30
Chemical Oxygen Demand^(c)	80
Oil & Grease^(c)	20
Surfactants (total)^(b)	15
Notes: (a) The surface runoff flow rate limit was estimated by the overall yearly rainfall data. As the actual flowrate from the petrol interceptors depends on the weather condition instead of the performance of the petrol interceptor, monitoring and reporting of this parameter is not required. Hence this parameter is not reported in *Error! Reference source not found.* and Table 4.10. (b) Parameter not required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO.

3.2.2 Landscape and Visual

In accordance with EM&A Manual, the landscape and visual mitigation measures shall be implemented.

For operation phase, site inspection shall be conducted once a month for the first year of operation of the Project. All measures as stated in the implementation schedule of the EM&A Manual (see Annex C), including compensatory planting, undertaken by both the Contractor and the specialist Landscape Sub-Contractor during the first year of the operation phase shall be audited by a Registered Landscape Architect (RLA) to ensure compliance with the intended aims of the measures and the effectiveness of the mitigation measures.

4 Monitoring Results

4.1 Air Quality

4.1.1 Operation Phase Monitoring

The concentrations of concerned air pollutants emitted from the stacks of the CAPCS, CHP, and ASP during the reporting period are monitored on-line by the continuous environmental monitoring system (CEMS). During the reporting period, there is no need to operate the standby flare and therefore no monitoring of the flare stack was undertaken.

With reference to the emission limits shown in Tables 3.2, 3.3 and 3.4, the hourly average concentrations and the number of exceedances of the concerned air emissions monitored for the CAPCS, CHP and ASP during this reporting period are presented in Tables 4.1 to 4.5.

It should be noted that measurements recorded under abnormal operating conditions, e.g. start up and stopping of stacks, unstable operation, test runs and interference of sensor, are disregarded.

Table 4.1 Hourly Average of Parameters Recorded for CAPCS

Parameter	Range of Hourly Average Conc. (mg/Nm³)	Emission Limit (mg/Nm³)	Exceedance Identified	Remarks
VOCs (including methane)	5.15 – 16.23	680	Nil	Nil
Dust (or TSP)	0.00 – 1.36	6	Nil	Nil
Odour (including NH₃ & H₂S) ^(b)	0.27 – 218.09	220	Nil	Nil
Note: (a) The odour unit is OU/Nm³.

Table 4.2 Hourly Average of Parameters Recorded for CHP 1

Parameter	Range of Hourly Average Conc. (mg/Nm³)^(a)	Max. Emission Limit (mg/Nm³)	Exceedance Identified	Remarks
Dust (or TSP)	0 – 5	15	Nil	Nil
Carbon Monoxide	0 – 513	650	Nil	Nil
NO_x	0 – 366	300	Identified ^(d)	System unstable (e.g. low efficiency, unstable column temperature )
SO₂	0 – 173	50	Identified^(e)	Disruption of power supply^(f). Desulpurisation system tripped and resumed to normal after urgent maintenance^(g).
NMVOCs ^(b)	Nil	150	Nil	Nil
VOCs (including methane) ^(c)	0 – 1,103	1,500	Nil	Nil
HCl	0 – 1	10	Identified	Nil
HF	0 – 1	1	Nil	Nil
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and dry basis. (b) No sampling was undertaken at CHP 1 as biogas production rate could not sustain the operation of the CHP stack for the scheduled sampling on 8 February 2021. (c) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. (d) Dates with exceedances on NO_x (number of exceedances on the day) were identified on 4 (1), 10 (1), 13 (4), 14 (4), 18 (1), 19 (2), 20 (2) and 29 (2) June 2021; 1 (3), 7 (1), 9 (2), 11 (6), 12 (3) and 19 (1) July 2021; 15 (1), 16 (4) and 20 (1) August 2021 (e) Dates with exceedances on SO₂ (number of exceedances on the day) were identified on were identified on 7 (8) and 22 (3) June 2021. (f) On 7 June 2021. (g) On 22 June 2021.

Table 4.3 Hourly Average of Parameters Recorded for CHP 2

Parameter	Range of Hourly Average Conc. (mg/Nm³)^{(a) (b)}	Max. Emission Limit (mg/Nm³)	Exceedance Identified	Remarks
Dust (or TSP)	0 – 13	15	Nil	Nil
Carbon Monoxide	0 – 571	650	Nil	Nil
NO_x	0 – 499	300	Identified ^(d)	System unstable (e.g. low efficiency, unstable column temperature )
SO₂	0 – 159	50	Identified ^(e)	Disruption of power supply^(f). Desulpurisation system tripped and resumed to normal after urgent maintenance.^(g)
NMVOCs ^(b)	6.0	150	Nil	Nil
VOCs (including methane)^(c)	0 – 1,284	1,500	Nil	Nil
HCl	0 – 1	10	Nil	Nil
HF	0 – 1	1	Nil	Nil
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and dry basis. (b) Bi-annual sampling of NMVOCs was conducted in CHP 2 on 8 February 2021. The hourly average concentration for NMVOC was 6 mg/Nm³. No exceedance was identified. The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. The result is provided in Annex G. (c) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. (d) Date with exceedances on NO_x (number of exceedances on the day) was identified on 7 (3) and 8 (5) June 2021; 5 (1), 26 (1), 28 (1) and 31 (1) July 2021; 23 (1) and 27 (1) August 2021. (e) Date with exceedances on SO₂ (number of exceedances on the day) was identified on 7 (7) and 22 (4) June 2021; 31 (3) July 2021; 1 (5), 27 (6), 28 (23) and 31 (14) August 2021. (f) On 7 June 2021. (g) On 22 June 2021 and in August 2021.

Table 4.4 Hourly Average of Parameters Recorded for CHP 3

Parameter	Range of Hourly Average Conc. (mg/Nm³)^(a)	Max. Emission Limit (mg/Nm³)	Exceedances Identified	Remarks
Dust (or TSP)	0 – 11	15	Nil	Nil
Carbon Monoxide	0 – 263	650	Nil	Nil
NO_x	0 – 479	300	Identified ^(d)	System unstable (e.g. low efficiency, unstable column temperature )
SO₂	0 – 148	50	Identified ^(e)	Desulpurisation system tripped and resumed to normal after urgent maintenance^(f). System unstable (e.g. low efficiency, unstable column temperature )^(g)
NMVOCs ^(b)	Nil	150	Nil	Nil
VOCs (including methane) ^(c)	0 – 1,695	1,500	Identified ^(h)	System unstable (e.g. low efficiency, unstable column temperature )
HCl	0 – 6	10	Nil	Nil
HF	0 – 2	1	Identified ⁽ⁱ⁾	System unstable (e.g. low efficiency, unstable column temperature )
Notes: (a) All values refer to an oxygen content in the exhaust gas of 6% and dry basis. (b) No sampling was undertaken at CHP3 as biogas production rate could not sustain the operation of the CHP stack for the scheduled sampling on 8 February 2021. (c) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. (d) Dates with exceedances on NO_x (number of exceedances on the day) were identified on 8 (7), 13 (1), 14 (13), 15 (9), 17 (3), 22 (2), 23 (5), 24 (13), 25 (1) and 30 (1) June 2021; 1 (2), 2 (1) and 7 (3) July 2021; 17 (1) and 29 (1) August 2021. (e) Dates with exceedances on SO₂ (number of exceedances on the day) were identified on 22 (1) June 2021; 7 (1) July 2021; 17 (1), 28 (5) and 31 (14) August 2021. (f) On 22 June 2021. (g) On 7 July 2021. (h) Dates with exceedances on VOC (number of exceedances on the day) were identified on 8 (1), 13 (2), 14 (7), 15 (6), 23 (1) and 30 (2) June 2021; 7 (2) July 2021. (i) Date with exceedances on HF (number of exceedances on the day) was identified on 17 (1) June 2021.

Table 4.5 Hourly Average of Parameters Recorded for ASP

Parameter	Range of Hourly Average Conc. (mg/Nm³)^(a)	Max. Emission Limit (mg/Nm³)	Exceedances Identified	Remarks
Dust (or TSP)	0 – 1	5	Nil	Nil
Carbon Monoxide	0 – 386	100	Identified^(c)	System unstable (e.g. low efficiency, unstable column temperature)
NOx	0 – 801	200	Identified^(d)	System instability due to unstable column temperature.
SO₂	0 – 101	50	Identified ^(e)	System instability due to unstable column temperature.
VOCs (including methane) ^(b)	0 – 894	20	Identified ^(f)	System instability due to unstable column temperature.
NH₃	0 – 369	35	Identified ^(g)	System instability due to unstable column temperature.
HCl	0 – 17	10	Identified ^(h)	System instability due to unstable column temperature.
HF	0 – 2	1	Identified ⁽ⁱ⁾	System instability due to unstable column temperature.
Notes: (a) All values refer to an oxygen content in the exhaust gas of 11% and dry basis. (b) The VOCs emission limit include methane as biogas is adopted as fuel in the combustion process. (c) Date with exceedances on CO (number of exceedances on the day) was identified on 6 (1) June 2021; 20 (1), 21 (1), 27 (2) and 28 (1) July 2021. (d) Dates with exceedances on NOx (number of exceedances on the day) were identified on 6 (1), 8 (1), 14 (1) and 17 (1) June 2021; 1 (1), 6 (3), 7 (5), 10 (3), 11 (2), 12 (11), 13 (1), 16 (1), 17 (5), 19 (5), 20 (12), 21 (2), 22 (1), 23 (6), 24 (11), 25 (1), 26 (5), 27 (1), 28 (12), 29 (17), 30 (22) and 31 (10) July 2021; 1 (15), 2 (7), 5 (1), 6 (3), 7 (7), 8 (3), 11 (5), 12 (5), 13 (21), 14 (6), 16 (9), 17 (10), 18 (4), 19 (2), 20 (1), 21 (2), 22 (1), 23 (2), 24 (2), 25 (1), 27 (2), 28 (3) and 29 (4) August 2021. (e) Dates with exceedances on SO2 (number of exceedances on the day) were identified on 12 (1) and 27 (1) July 2021; 1 (5) August 2021. (f) Dates with exceedances on VOCs (number of exceedances on the day) were identified on 12 (2), 20 (1), 27 (2), 28 (1) and 29 (3) July 2021; 1 (2) August 2021. (g) Dates with exceedances on NH₃ (number of exceedances on the day) was identified on 6 (5), 7 (8), 8 (2), 9 (9), 10 (5), 11 (5), 12 (4), 13 (15), 14 (15), 15 (9), 16 (15), 17 (7), 18 (14), 19 (10), 23 (1), 28 (1) and 29 (4) June 2021; 2 (3), 7 (1), 8 (1), 9 (2), 10 (4), 11 (1), 12 (12), 13 (11), 14 (12), 15 (2), 16 (2), 17 (15), 18 (7), 20 (4), 21 (13), 22 (11), 23 (3), 24 (4), 25 (5), 26 (4), 27 (3), 28 (1) and 29 (4) July 2021; 1 (1), 9 (1), 20 (3), 25 (5), 26 (4), 27 (2) and 28 (2) August 2021. (h) Dates with exceedances on HCl (number of exceedances on the day) were identified on 27 (1) and 31 (1) July 2021. (i) Date with exceedances on HF (number of exceedances on the day) was identified on 12 (1) July 2021.

4.2 Odour

4.2.1 Operation Phase Monitoring

Odour patrol was conducted by the independent odour patrol team of ALS Technichem (HK) Pty Ltd on 9 July and 9 August 2021. According to the EM&A Manual and EP requirements, it is considered an exceedance if the odour intensity recorded by the panellists is Level 2 or above. During this reporting period, no Level 2 Odour Intensity was recorded. The odour patrol result is shown in Annex H.

4.3 Water Quality

4.3.1 Operation Phase Monitoring

Effluent discharge was sampled monthly from the Effluent Storage Tank as stipulated in the operation phase discharge licence. Discharge from the Petrol Interceptors were sampled bi-monthly since July 2021 as stipulated in the operation phase discharge licence. The results of the discharge samples from the Effluent Storage Tank are recorded in Table 4.6 to 4.8. The results of the discharge samples from the Petrol Interceptors are recorded in Table 4.9 and 4.10.

Table 4.6 Results of the Discharge Sample Collected from the Effluent Storage Tank on 10 June 2021

Parameters	Discharged Effluent Concentration (mg/L)	Discharge Limit (mg/L)	Compliance with Discharge Limit
pH (pH units)	7.94 - 8.36	6-10 ^(a)	Yes
Suspended Solids	237	800	Yes
Biochemical Oxygen Demand (5 days, 20°)	48	800	Yes
Chemical Oxygen Demand	1,340	2,000	Yes
Oil & Grease	<5	40	Yes
Total Nitrogen	102	200	Yes
Total Phosphorus	40.6	50	Yes
Surfactants (total)	<1.0	25	Yes
Notes: (a) Daily Average.

Table 4.7 Results of the Discharge Sample Collected from the Effluent Storage Tank on 8 July 2021

Parameters	Discharged Effluent Concentration (mg/L)	Discharge Limit (mg/L)	Compliance with Discharge Limit
pH (pH units)	7.67 – 8.33	6-10 ^(a)	Yes
Suspended Solids	217	800	Yes
Biochemical Oxygen Demand (5 days, 20°)	30	800	Yes
Chemical Oxygen Demand	1,340	2,000	Yes
Oil & Grease	<5	40	Yes
Total Nitrogen	90.4	200	Yes
Total Phosphorus	48.3	50	Yes
Surfactants (total)	<1.5	25	Yes
Notes: (a) Daily Average.

Table 4.8 Results of the Discharge Sample Collected from the Effluent Storage Tank on 11 and 30 August 2021

Parameters	Discharged Effluent Concentration (mg/L)	Discharge Limit (mg/L)	Compliance with Discharge Limit
pH (pH units)	7.49 – 8.40	6-10 ^(a)	Yes
Suspended Solids ^(b)	628	800	Yes
Biochemical Oxygen Demand (5 days, 20°) ^(b)	82	800	Yes
Chemical Oxygen Demand ^(b)	1,830	2,000	Yes
Oil & Grease ^(b)	<5	40	Yes
Total Nitrogen ^(b)	146	200	Yes
Total Phosphorus ^(c)	46.8	50	Yes
Surfactants (total) ^(b)	2.5	25	Yes
Notes: (a) Daily Average. (b) Effluent sample collected on 11 August 2021. (c) Effluent sample collected on 30 August 2021. A joint sampling with the EPD was carried out on 11 August 2021. While the monitoring result of the sample collected by the EPD shown no exceedance, exceedance was found in the sample collected by the Contractor. The Contractor has investigated the operating conditions of the on-site wastewater treatment plant afterwards and found no major abnormality. Therefore, additional sampling was carried out by the Contractor on 30 August 2021, here shows the updated result.

Table 4.9 Results of the Discharge Sample from the Petrol Interceptor 1 on 11 August 2021

Parameters	Discharged Effluent Concentration (mg/L)	Discharge Limit (mg/L)	Compliance with Discharge Limit
Suspended Solids^(b)	5 ^(a)	30	Yes
Chemical Oxygen Demand ^(c)	15 ^(a)	80	Yes
Oil & Grease ^(c)	<5 ^(a)	20	Yes
Surfactants (total)^(b)	<1.0 ^(a)	15	Yes
Notes: (a) Effluent sample collected on 11 August 2021. (b) Parameter not required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO.

Table 4.10 Results of the Discharge Sample from the Petrol Interceptor 2 on 11 August 2021

Parameters	Discharged Effluent Concentration (mg/L)	Discharge Limit (mg/L)	Compliance with Discharge Limit
Suspended Solids ^(b)	5 ^(a)	30	Yes
Chemical Oxygen Demand ^(c)	32 ^(a)	80	Yes
Oil & Grease ^(c)	<5 ^(a)	20	Yes
Surfactants (total)^(b)	<1.0 ^(a)	15	Yes
Notes: (a) Effluent sample collected on 11 August 2021. (b) Parameter not required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO. (c) Parameters required to be reported in accordance to Section B2 of the Effluent Discharge Licence under the WPCO.

No exceedance of discharge limit was recorded during the reporting period.

4.4 Waste Management

4.4.1 Operation Phase Monitoring

Wastes generated from the operation of the Project include chemical waste, wastes generated from pre-treatment process and general refuse ([3]). Reference has been made to the Monthly Summary Waste Flow Table prepared by the Contractor (see Annex D). With reference to the relevant handling records and trip tickets of this Project, the quantities of different types of waste generated from the operation of the Project in the reporting month are summarised in Table 4.11.

Table 4.11 Quantities of Waste Generated from the Operation of the Project

Month / Year	Chemical Waste	Waste Generated from Pre-treatment Process		General Refuse
	Disposal of at CWTC	Disposed of at Landfill ^(a)	Recycled ^(b)	Disposed of at Landfill ^{(a) (d)}	Recycled ^(c)
June 2021	0 L	558.72 tonnes	0.00 tonnes	2.88 tonnes ^(d)	0.00 tonne
July 2021	0 L	382.74 tonnes	0.00 tonnes	3.00 tonnes ^(d)	0.00 tonne
August 2021	3,420 L^(e)	687.05 tonnes	0.00 tonnes	3.00 tonnes ^(d)	0.00 tonne
Notes: (a) Waste generated from pre-treatment process and general refuse other than chemical waste and recyclables were disposed of at NENT landfill by sub-contractors. (b) Among waste generated from pre-treatment process, 0.00 tonne of metals, 0.00 tonne of papers/ cardboard packing and 0.00 tonne of plastics were sent to recyclers for recycling during the reporting period. (c) Among general refuse, 0.00 tonnes of metals, 0.00 tonnes of papers/ cardboard packing and 0 tonnes of plastics were sent to recyclers for recycling during the reporting period. (d) It was assumed that four 240-litre bins filled with 80% of general refuse were collected at each collection. The general refuse density was assumed to be around 0.15 kg/L. (e) It includes 1,200 L of spent lube oil, 2,000 L of sodium hydroxide solution and 220 kg (regarded as 220 L) of spent absorbents contaminated with acids.

5 Site Audit

5.1 Environmental Site Audit

5.1.1 Operation Phase

The monthly inspections of the operation phase of the Project covered the operation phase environmental site inspections. The inspections checked the implementation of the recommended mitigation measures for air quality, landscape and visual, water quality, waste (land contamination) and hazard-to-life stated in the Implementation Schedule (see Annex C).

Follow-up actions resulting from the site inspections were generally taken as reported by the Contractor. The Contractor has implemented environmental mitigation measures recommended in the approved EIA Report and EM&A Manual.

June 2021

The monthly inspection of the operation phase of the Project on 18 June 2021 covered the operation phase environmental site audit. Joint site inspections was conducted by representatives of the Contractor, IEC and the MT on 18 June 2021 as required for the operation of the Project.

July 2021

The monthly inspection of the operation phase of the Project on 30 July 2021 covered the operation phase environmental site audit. Joint site inspections was conducted by representatives of the Contractor, IEC and the MT on 30 July 2021 as required for the operation of the Project.

August 2021

The monthly inspection of the operation phase of the Project on 3 August 2021 covered the operation phase environmental site audit. Joint site inspections was conducted by representatives of the Contractor, IEC and the MT on 3 August 2021 as required for the operation of the Project.

5.2 Landscape and Visual Audit

It was confirmed that the necessary landscape and visual mitigation measures during the operation phase as summarised in Annex C were generally implemented by the Contractor. No non-compliance in relation to the landscape and visual mitigation measures was identified during the site audits in this reporting period and therefore no further actions are required. The ET/MT will keep track of the EM&A programme to check compliance with environmental requirements and the proper implementation of all necessary mitigation measures.

June 2021

Monthly inspection of the landscape and visual mitigation measures for the operation phase of the Project was performed on 18 June 2021.

July 2021

Monthly inspection of the landscape and visual mitigation measures for the operation phase of the Project was performed on 30 July 2021.

August 2021

Monthly inspection of the landscape and visual mitigation measures for the operation phase of the Project was performed on 3 August 2021.

6 Environmental Non-conformance

6.1 Summary of Environmental Non-Compliance

June 2021

Non-compliance of emission limits for CHP and ASP were recorded during the reporting period.

The Contractor has reviewed the organic waste treatment processes (i.e. waste reception, waste pre-treatment, anaerobic digesters, and composting processes) and found that they were operated normally during the reporting period. The Contractor has investigated air pollution control systems for the CHP and ASP and identified several potential causes for the exceedance. Remedial and follow-up actions had been recommended to the Contractor to perform accordingly. The Investigation Report is shown in Annex F.

July 2021

Non-compliance of emission limits for CHP and ASP were recorded during the reporting period.

August 2021

Non-compliance of emission limits for CHP and ASP were recorded during the reporting period.

The Contractor has reviewed the organic waste treatment processes (i.e. waste reception, waste pre-treatment, anaerobic digesters, and composting processes) and found that they were operated normally during the reporting period. The Contractor has investigated air pollution control systems for the CHP and the ASP and identified several potential causes for the exceedance. Remedial and follow-up actions had been recommended to the Contractor to perform accordingly. The Investigation Report is shown in Annex F.

6.2 Summary of Environmental Complaint

No complaint was received during the reporting period.

6.3 Summary of Environmental Summon and Successful Prosecution

No summon/prosecution was received during the reporting period. The cumulative summons/prosecution log is shown in Annex E.

7 Future Key Issues

7.1 Key Issues for the Coming Reporting Period

Activities to be undertaken for the coming reporting period are:

· Operation of the Project.

· Modification of the CHP and ASP to control the air emission.

8 Conclusions

This EM&A Report presents the EM&A programme undertaken during the reporting period from 1 June 2021 to 31 August 2021 in accordance with EM&A Manual (Version F) and requirements of EP (FEP-01/395/2010/C).

For the operation phase, exceedances of the emission limits for stack monitoring (including CAPCS, CHP and ASP stacks) were recorded under normal operating conditions during the reporting period (see Table 8.1).

Table 8.1 Exceedances for Stack Emissions

Stack	Exceedances During the Reporting Period
Centralised Air Pollution Control Unit (CAPCS)	· Nil
Cogeneration Unit (CHP)	· Exceeded emission limit of NO_x on 4, 7, 8, 10, 13, 14, 15, 17, 18, 19, 20, 22, 23, 24, 25, 29 and 30 June 2021; 1, 2, 5, 7, 9, 11, 12, 19, 26, 28 and 31 July 2021; 15, 16, 17, 20, 23, 27 and 29 August 2021. · Exceeded emission limit of SO₂ on 7 and 22 June 2021; 7 and 31 July 2021; 1, 17, 27, 28 and 31 August 2021. · Exceeded emission limit of VOCs on 8, 13, 14, 15, 23 and 30 June 2021; 7 July 2021. · Exceeded emission limit of HF on 17 June 2021.
Ammonia Stripping Plant (ASP)	· Exceeded emission limit of CO on 6 June 2021; 20, 21, 27 and 28 July 2021. · Exceeded emission limit of NO_xon 6, 8, 14 and 17 June 2021; 1, 6, 7, 10, 11, 12, 13, 16, 17, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30 and 31 July 2021; 1, 2, 5, 6, 7, 8, 11, 12, 13, 14, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 27, 28 and 29 August 2021. · Exceeded emission limit of SO₂ on 12 and 27 July 2021; 1 August 2021. · Exceeded emission limit of VOCs on 12, 20, 27, 28 and 29 July 2021; 1 August 2021. · Exceeded emission limit of NH₃ on 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 28 and 29 June 2021; 2, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 20, 21, 22, 23, 24, 25, 26, 27, 28 and 29 July 2021; 1, 9, 20, 25, 26, 27 and 28 August 2021. · Exceeded emission limit of HCl on 27 and 31 July 2021. · Exceeded emission limit of HF on 12 July 2021.

In June, the exceedances in emission parameters of CHP were found to be a result of the occasional low biogas loading at the CHPs and unstable performance of CHP 3. The exceedances of ASP were found to be result of incomplete combustion of biogas at ASP. In July, exceedances in emission parameters of CHP were found to be a result of the low biogas loading at the CHPs. The exceedances of ASP were found to be result of unstable condition at the column and the thermal oxidiser of the ASP. In August, the exceedances in NO_x of CHP were found to be a result of the low biogas loading at the CHPs and the unstable condition of CHP1. The exceedances of SO₂ of CHPs and ASP were found to be a result of the tripping of the desulphurisation system. The exceedances of ASP were found to be result of unstable condition at the thermal destructor of the ASP.

The Contractor has implemented mitigation measures to control the exceedance including the maintenance and fine-tuning of equipment of the ASP, the investigation on the underlying reasons of exceedances in CHP and ASP and the continuous seeking of better and more feedstock to increase biogas loading and testing at ASP to optimise combustion efficiency and overall performance.

No non-compliance to the effluent discharge limit was recorded during this reporting period.

The environmental control /mitigation measures related to air quality, water quality, waste (including land contamination prevention), hazard-to-life and landscape and visual recommended in the approved EIA Report and the EM&A Manual were properly implemented by the Contractor during the reporting period.

Monthly landscape and visual monitoring were conducted in the reporting period. The necessary landscape and visual mitigation measures recommended in the approved EIA Report were generally implemented by the Contractor.

No complaint/summon/prosecution was received.

([1]) As some of the minor items are yet to be closed out in March 2019, the construction phase EM&A programme and Operation Phase EM&A programme were undertaking in parallel in March 2019.

([2]) A standby facility. Only operate when the CHPs are not in operation or when the biogas generated exceeded the utilisation rate of the CHPs.

([3]) Public fill and construction waste may only be generated during maintenance works when there are civil or structural works.