The construction works of CCGT Unit No. 1 of the Additional Gas-fired Generation Units Project at the Black Point Power Station commenced on 5 December 2016 and completed on 31 May 2021. This is the Final Environmental Monitoring and Audit (EM&A) Review Report which summarises and reviews the EM&A results of the EM&A programme during the construction of CCGT Unit No. 1 against the prediction of the EIA Report or statutory requirements.

Summary of the Key Construction Works undertaken for CCGT Unit No. 1

The major construction works of CCGT Unit No. 1 included site establishment and land-based civil works, installation and reinstatement works, and testing and commissioning for CCGT Unit No.1.

Summary of EM&A Programme for CCGT Unit No. 1

Activities of the EM&A Programme during the construction phase for CCGT Unit No. 1 includes:

n Environmental Site Inspection – Once per week.

Construction Waste Management

Inert C&D materials (public fill) and non-inert C&D wastes (construction waste) were generated during the construction phase. The construction waste and public fill were disposed of at the WENT Landfill and Tuen Mun Area 38 Fill Bank, respectively. Mitigation measures recommended in the EIA Report and the Waste Management Plan (WMP) were implemented by the Contractors and were considered effective in minimising the total quantity of wastes generated during the construction phase.

Regular Environmental Site Inspection

Regular environmental site inspections were carried out by the Environmental Team (ET) weekly throughout the construction phase. These inspections confirmed that mitigation measures recommended in the EIA Report, the EM&A Manual and the requirements stipulated in the Environmental Permit (EP) were properly implemented by the Contractors. The findings of environmental site inspections showed that there were no non-conformance issues recorded and outstanding environmental issues for the construction phase, and the recommended mitigation measures had been implemented properly.

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

No non-compliance event was recorded during the construction phase.

No complaint was received during the construction phase.

No summon or prosecution was received in the construction phase.

The EM&A requirements have been reviewed and were considered as adequate and effective. No change to the requirements was considered to be necessary. The recommended environmental mitigation measures are also considered to be effective and efficient in reducing the potential environmental impacts associated with the construction of CCGT Unit No. 1.

Overall, the EM&A results indicated that the construction of CCGT Unit No. 1 has not caused unacceptable environmental impact. This is in line with the assessment predicted in the EIA Report.

1. Introduction

The Castle Peak Power Company Limited (CAPCO) is a joint venture between CLP Power Hong Kong Limited (CLP) and China Southern Power Grid Company Limited with CLP as the operator. ERM-Hong Kong, Limited (ERM) and Mott MacDonald Hong Kong Limited were appointed by CAPCO as the Environmental Team (ET) and the Independent Environmental Checker (IEC), respectively, to undertake the Environmental Monitoring and Audit (EM&A) activities for the installation of CCGT Unit No.1 of the Additional Gas-fired Generation Units Project at the Black Point Power Station (BPPS).

1.1 Purpose of the Report

This is the Final EM&A Review Report which summarises and reviews the monitoring results and audit findings of the EM&A programme throughout the construction phase of the CCGT Unit No.1 from December 2016 to May 2021.

2. Project information

2.1 Background

The scope of the CCGT Unit No.1 involves construction and operation of an additional combined cycle gas turbine (CCGT) unit (with an installed capacity of up to 600 MW) at the BPPS. The additional generation unit will be of CCGT configuration using natural gas as the primary fuel. It is a Designated Project under the Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) with the Environmental Permit (EP-507/2016/C).

CCGT Unit No. 1 is located within the existing boundaries of the BPPS site. The size of the land reserved for the additional generation unit CCGT Unit No.1 and the associated facilities is about 40,000 m². The location plan of key Project components for CCGT Unit No. 1 is shown in Appendix A.

2.2 Construction Programme and Activities

A summary of the key activities undertaken during the construction phase is shown in Table 2.1. The construction programme for CCGT Unit No. 1 is presented in Appendix B.

Table 2.1 Summary of the Key Activities Undertaken during the Construction Phase of CCGT Unit No.1

Construction Activities undertaken:
n Site establishment; n Land-based civil works; n Construction of stack, cooling water intake and discharge facilities; n Installation of generator, boiler and heat recovery steam generator (HRSG), selective catalytic reduction (SCR) system; n Reinstatement works; and n Testing and commissioning.

Construction Activities undertaken:

n Site establishment;

n Land-based civil works;

n Construction of stack, cooling water intake and discharge facilities;

n Installation of generator, boiler and heat recovery steam generator (HRSG), selective catalytic reduction (SCR) system;

n Reinstatement works; and

n Testing and commissioning.

The construction of CCGT Unit No. 1 was completed on 31 May 2021. The site photographic records on the completion of construction works are shown in Appendix C.

2.3 Project Organisation

The project organisational chart and contact details for CCGT Unit No. 1 is shown in Appendix D.

3. EM&A REQUIREMENTs

3.1 General

Potential environmental impacts, including air quality, hazard to life, noise, water quality, waste, land contamination, ecology, fisheries, landscape and visual and cultural heritage had been the subjects for the construction phase EM&A of the Project, which had been addressed through the monitoring and controls specified in the EM&A Manual and in the construction contracts. Monitoring of the effectiveness of the mitigation measures had been achieved through site inspections.

3.2 SITE INSPECTIONS & AUDITS

In accordance with the EM&A Manual, weekly site inspection is required to ensure that the mitigation measures in the approved EIA Report, the EM&A Manual and the requirements in the Environmental Permit are properly implemented by the Contractors.

3.3 WATER QUALITY MONITORING

In accordance with the EM&A Manual, monitoring works is required at a frequency of once per week on the first year of commissioning of the CCGT Unit No.1. The monitoring details including monitoring requirement, locations of monitoring stations have been confirmed and approved by EPD before commissioning of the CCGT Unit No.1.

Baseline water quality monitoring was conducted from 20 April 2020 to 15 May 2020. The Baseline Water Quality Monitoring Report was submitted to EPD on 4 August 2020.

The construction of CCGT Unit No. 1 was completed on 31 May 2021 and the operation phase water quality monitoring has been commenced since June 2021.

4. IMPLEMENTATION STATUS OF THE ENVIRONMENTAL PROTECTION REQUIREMENTS

4.1 General

The Contractors have implemented all the environmental mitigation measures and requirements as stated in the EIA Report, Environmental Permit (EP), EM&A Manual and Vessel Control Plan for the installation of CCGT Unit No. 1.

During the environmental site inspections, the implementation status of the environmental mitigation measures for CCGT Unit No.1 were inspected and reviewed. It is concluded that the environmental mitigation measures as recommended in the EIA Report were implemented satisfactorily. The implementation status during the construction phase is summarised in Appendix E.

4.2 Marine Vessel Operation

Vessel operation for transport of equipment was conducted during the construction phase of CCGT Unit No. 1. An environmental briefing had been conducted to the vessel operators in accordance with the Vessel Control Plan prepared for the Project under Condition 2.4 of the EP. The environmental briefing had included the following content:

Requirements under the EP and Vessel Control Plan;

n General education on local cetaceans;

n Predefined and regular marine travel routes for this Project;

n Vessel speed limit within designated areas and areas identified as high presence of Indo-Pacific humpback dolphin;

n Guidelines for safe vessel operation in the presence of cetaceans;

n Guidelines on effluent /wastewater handling from vessels to prevent avoidable water quality impacts; and

n Policy of no dumping of rubbish, food, oil, or chemicals from vessels.

Details of the monitoring method and procedures had been agreed with the IEC before implementation and communicated with the vessel operators. The record of marine travel routes of the works vessels was provided by the vessel operators for inspection and monitoring purposes.

During the construction phase of CCGT Unit No.1, no warning had been issued to vessel operators given that the vessel operators followed the requirements under the EP and Vessel Control Plan.

5. Review of EM&A RESULTS

5.1 Waste Management

The waste generated includes inert construction and demolition (C&D) materials, and non-inert C&D materials. Non-inert C&D materials are made up of general refuse and recyclable wastes such as plastics and paper/cardboard packaging waste. Steel materials generated from the CCGT Unit No.1 are also grouped into non-inert C&D materials as the materials were not disposed of with other inert C&D materials.

With reference to relevant handling records and trip tickets of CCGT Unit No. 1, the quantities of different types of waste generated during the construction phase are summarised in Table 5.1. Details of waste management data are presented in Appendix F.

Table 5.1 Quantities of Waste Generated from CCGT Unit No. 1

Reporting Month	Quantity
	Inert C&D Materials ^{(a) (b)}	Chemical Waste ^(d)	Non-inert C&D Materials
			General Refuse ^(c)	Recycled materials
			General Refuse ^(c)	Paper/cardboard	Plastics	Metals
	(in '000m³)	(in'000 kg)	(in '000m³)	(in'000 kg)	(in'000 kg)	(in'000 kg)
December 2016 – May 2021	139.873	3.680	4.425	0.004	0.750	1246.673
Notes: (a) Inert C&D materials include bricks, concrete, building debris, rubble and excavated spoil. (b) The inert C&D materials generated from CCGT Unit No.1 were sent to Tuen Mun Area 38 Fill Bank during the reporting month. (c) The general refuse generated from the CCGT Unit No.1 was sent to WENT landfill during the reporting month. (d) Chemical waste includes waste oil and spent pipes with lubricating oil. It is assumed density of waste oil to be 0.8 kg/L.

The estimated amount of waste generated from CCGT Unit No.1 predicted in EIA Report and the actual cumulative quantities of waste generated from the construction phase of CCGT Unit No.1 are presented in Table 5.2. Mitigation measures recommended in EIA Report were implemented by the Contractors as far as practicable and were considered effective in reducing the total quantity of wastes generated during the construction phase.

Table 5.2 Comparison of Estimated and Actual Amount of Waste Generated from CCGT Unit No. 1

Type of Material	Estimated Amount in the EIA Report	Actual Amount during the Construction Phase
Total Amount of Inert C&D Materials disposed as Public Fill ^(a)(in '000m³)	80.96	132.308
Amount of Inert C&D Materials Reused in the Contract (in '000m³)	8.89	6.892
Amount of Inert C&D Materials Reused in Other Projects (in '000m³)	-	0.119
Total Amount of Non-Inert C&D Materials and General Refuse disposed at WENT Landfill ^(b)(in '000m³)	1.525	4.425
Chemical Waste ^(c) (in ''000kg)	10.20	3.680
Notes: (a) Inert C&D materials include site clearance waste, excavated materials, building works generated from construction of CCGT Unit No.1. (b) Non-inert C&D materials include site clearance waste, excavated materials, building works generated from construction period of CCGT Unit No.1 for the entire project. The amount of general refuse was estimated 780 kg per day for construction of CCGT Unit No.1. (c) Chemical waste includes waste oil and spent pipes with lubricating oil. Density of waste oil is assumed to be 0.8 kg/L.

5.2 Environmental Site Inspection

Joint site inspections were conducted by representatives of the Contractors, CAPCO Project Team and ET every week throughout the construction phase of the CCGT Unit No. 1. The representative of the IEC joined the site inspections on a monthly basis. These inspections ensured that mitigation measures in the EIA Report, EM&A Manual and requirements stipulated in the EP were properly implemented by the Contractors. There are no outstanding environmental issues for the construction phase of the CCGT Unit No. 1.

5.3 Conclusion of Review

The environmental monitoring results for the construction phase of the CCGT Unit No. 1 have been reviewed and compared with the findings of the EIA Report. The EIA Report concluded that no unacceptable environmental impacts would be caused by the CCGT Unit No. 1. The environmental monitoring results of the construction phase demonstrated no unacceptable impact. Mitigation measures recommended in the EP, EIA Report and EM&A Manual were implemented by the Contractors as far as practicable and were considered effective.

6. Environmental Non-conformance

6.1 Summary of Monitoring Exceedance

No environmental monitoring is required during the construction phase of CCGT Unit No.1.

6.2 Summary of Environmental Non-compliance

No non-compliance event was recorded during the construction phase of CCGT Unit No.1.

6.3 Summary of Environmental Complaint

No environmental complaint was received during the construction phase of CCGT Unit No.1.

6.4 Summary of Environmental Summon and Successful Prosecution

No summon or prosecution was received during the construction phase of CCGT Unit No.1.

7. Conclusions

This Final Environmental Monitoring and Audit (EM&A) Review Report presents the EM&A works carried out during the construction phase of the CCGT Unit No. 1 in accordance with the EM&A Manual and the requirements of EP-507/2016/C.

7.1 Review of the Monitoring Methodology

It is predicted in the EIA that there would be no unacceptable or residual impacts arising from the CCGT Unit No. 1 with implementation of the recommended mitigation measures. The monitoring results showed in general comparable to the predictions or findings in the EIA Report and also indicated that the construction of the CCGT Unit No. 1 did not cause unacceptable impacts on the environment with the implementation of the mitigation measures recommended in the EIA Report.

The Contractors had implemented possible and feasible mitigation measures to mitigate the potential environmental impacts during construction. The recommended mitigation measures were effective and EIA predictions remained valid.

7.2 Review of the Adequacy of EM&A Programme

Environmental monitoring and audit, including environmental site inspection, was conducted during the construction phase of the CCGT Unit No. 1 in accordance with the requirements stipulated in the EM&A Manual and Environmental Permit.

The monitoring programmes were considered effective in reflecting the environmental conditions. With proper implementation of mitigation measures and environmental monitoring and audit during the CCGT Unit No. 1, the overall environmental performance of the CCGT Unit No. 1 was acceptable.