COVER

Table of Content

EXECUTIVE SUMMARY

1. INTRODUCTION.. 1

1.1 Background 1

1.2 Project Organisation 1

1.3 Construction Works undertaken during the Reporting Month 1

1.4 Summary of EM&A Requirements 2

2. AIR QUALITY.. 4

2.1 Monitoring Requirements 4

2.2 Monitoring Locations 4

2.3 Monitoring Equipment 4

2.4 Monitoring Parameters, Frequency and Duration 4

2.5 Monitoring Procedures and Calibration Details 5

2.6 Results and Observations 6

3. NOISE.. 8

3.1 Monitoring Requirements 8

3.2 Monitoring Locations 8

3.3 Monitoring Equipment 8

3.4 Monitoring Parameters, Frequency and Duration 8

3.5 Monitoring Procedures and Calibration Details 9

3.6 Results and Observations 9

4. ENVIRONMENTAL AUDIT.. 11

4.1 Review of Environmental Monitoring Procedures 11

4.2 Assessment of Environmental Monitoring Results 11

4.3 Waste Management 11

4.4 Site Environmental Audit 12

4.5 Status of Environmental Licensing and Permitting 12

4.6 Implementation Status of Environmental Mitigation Measures 12

4.7 Implementation Status of Event/Action Plans 12

4.8 Implementation Status of Environmental Complaint Handling Procedures 12

5. FUTURE KEY ISSUES. 14

5.1 Key Issues for the Coming Month 14

5.2 Monitoring Schedules for the Next 3 Months 14

5.3 Construction Program for the Next 3 Months 14

6. CONCLUSION.. 15

 


List of Tables

 

Table 1.1......... Construction Activities and Their Corresponding Environmental Mitigation Measures

Table 2.1......... Air Quality Monitoring Locations

Table 2.2......... Air Quality Monitoring Equipment

Table 2.3......... Air Quality Monitoring Parameter, Duration and Frequency

Table 3.1......... Noise Monitoring Equipment

Table 3.2......... Noise Monitoring Duration and Parameter

Table 4.1......... Summary of AL Level Exceedances on Monitoring Parameters

Table 4.2......... Estimated Amounts of Waste in April 2024

Table 4.3......... Summary of Environmental Licensing and Permit Status

Table 4.4......... Environmental Complaints Received in April 2024

Table 4.5......... Outstanding Environmental Complaints Carried Over

 

List of figures

 

Figure 1.1 Layout of Work Site

Figure 2.1 Location of Air Quality Monitoring Stations

Figure 3.1 Location of Noise Monitoring Stations

 

Appendices

 

Appendix A Organization Chart

Appendix B Action and Limit Levels for Air Quality and Noise

Appendix C Environmental Monitoring Schedule

Appendix D Air Quality Monitoring Results for April 2024

Appendix E Noise Monitoring Results for April 2024

Appendix F The QA/QC Procedures and Results

Appendix G Event/Action Plans

Appendix H Site Audit Summary

Appendix I Summary of EMIS

Appendix J Tentative Construction Programme

Appendix K Monthly Waste Flow Table for April 2024

 

 

 

 



EXECUTIVE SUMMARY

 

This is the 168th monthly Environmental Monitoring and Audit (EM&A) report for the Project “Construction of Lamma Power Station Extension” prepared by the Environmental Team (ET). This report presents the results of impact monitoring on air quality and noise for the said project in April 2024.

 

The reclamation and submarine pipeline works were completed with the first gas-fired combined cycle unit (viz. Unit L9) commissioned in October 2006, working currently on base load operation. To cope with the scheduled retirement of the existing units at Lamma Power Station, the second gas-fired combined cycle unit (viz. Unit L10) L10 was commissioned for reliable operation in February 2020.

 

In September 2016, the Government approved HK Electric to construct the third combined cycle gas-fired generating unit (Unit L11) to implement the 2020 Fuel Mix Target. L11 was commissioned for reliable operation effective in May 2022.

 

With the Government’s approval to build the fourth combined cycle gas-fired generating unit (L12) in July 2018, the associated construction work commenced in April 2019. Gas-in for L12 were carried out in August 2023 to facilitate commissioning activities. L12 was commissioned for reliable operation effective on 31/3/2024. The operational EM&A work for L9, L10, L11 and L12 is recorded in the separate monthly EM&A report for the Project “Operation of Lamma Power Station Extension”.

 

With the Government’s approval to build the fifth combined cycle gas-fired generating unit (L13) in November 2023, the associated construction work commenced in end January 2024.

 

Air and noise monitoring were performed. The results were checked against the established Action/Limit (AL) levels. An on-site audit was conducted once per week. The implementation status of the environmental mitigation measures, Event/Action Plan and environmental complaint handling procedures were also checked.

 

Construction Activities Undertaken

 

Construction activities for Lamma Extension during the reporting month are tabulated as follows:

 

Item

Construction Activities

Unit L13 Foundation Works

Bored pile work

Environmental Monitoring Works

 

All monitoring work at designated stations was performed as scheduled satisfactorily.

 

Air Quality

 

No exceedance of Action/Limit levels on 1-hour TSP and 24-hour TSP for air quality was recorded in the month.

 

Noise

 

No exceedance of Action and Limit levels for noise arising from the construction of Lamma Extension was recorded in the month.

 

Site Environmental Audit

 

Site audits were carried out on a weekly basis to monitor environmental issues on the construction site. The site conditions were generally satisfactory.

 

Environmental Licensing and Permitting

 

Description

Permit No.

Valid Period

Issued To

Date of Issuance

From

To

Varied Environmental Permit

EP-071/2000/D

28/09/20

-

HK Electric

28/09/20

Waste Disposal Billing Account

Account No.: 7038672

27/10/20

-

Contractor

27/10/20

Waste Disposal Billing Account

Account No.: 7039272

08/01/21

-

Contractor

08/01/21

Waste Disposal Billing Account

Account No.: 7049726

09/01/24

-

Contractor

09/01/24

 

Implementation Status of Environmental Mitigation Measures

 

Environmental mitigation measures for the construction activities as recommended in the EM&A manual were implemented in the reporting month.

 

Environmental Complaints

No complaint in relation to the environmental impact of the construction activities was received in the reporting month.

 

Future Key Issues

 

The future key issues to be considered in the coming month are as follows:

 

Unit L13 Foundation Works

 

-          to continue executing the preventive measures for avoiding noise exceedance and keep monitoring/ reviewing the performance;

-          to monitor and review the sufficiency of the dust suppression measures provided and increase the resources accordingly if necessary;

-          to treat wastewater in sedimentation pit and tanks for reuse on water spraying.

 

Concluding Remarks

 

The environmental performance of the project was generally satisfactory.




1.             INTRODUCTION

 

1.1          Background

 

The Environmental Team (hereinafter called the “ET”) was formed within the Hongkong Electric Co. Ltd (HEC) to undertake Environmental Monitoring and Audit for Construction of Lamma Power Station Extension” (hereinafter called the “Project”). Under the requirements of Section 6 of Environmental Permit EP-071/2000/D, an EM&A programme for impact environmental monitoring set out in the EM&A Manual (Construction Phase) is required to be implemented. In accordance with the EM&A Manual, environmental monitoring of air quality, noise and water quality and regular environmental audits are required for the Project. With the completion of reclamation and submarine pipeline works, no further marine water quality monitoring would be required.

 

The Project involves the construction of a gas-fired power station employing combined cycled gas turbine technology, forming an extension to the existing Lamma Power Station. The key elements of the Project including the construction activities associated with the transmission system and submarine gas pipeline are outlined as follows.

 

          dredging and reclamation to form approximately 22 hectares of usable area;

          construction of six 300MW class gas-fired combined cycle units;

          construction of a gas receiving station;

          construction of a transmission system linking the Lamma Extension to load centres on Hong Kong Island;

          laying of a gas pipeline for the supply of natural gas to the new power station

 

This report summarizes the environmental monitoring and audit work for the Project for the month of April 2024.

 

1.2          Project Organisation

 

An Environmental Management Committee (EMC) has been set up in HEC to oversee the Project. The management structure includes the following:

 

          Environmental Protection Department (The Authority);

          Environmental Manager (The Chairman of the Environmental Management Committee);

          Engineer;

          Independent Environmental Checker (IEC);

          Environmental Team (ET);

          Contractor.

 

The project organisation chart for the construction EM&A programme is shown in Appendix A.

 

1.3          Construction Works undertaken during the Reporting Month

 

Construction activities for Unit L13 foundation works were bored pile work. Layout plan for construction site is shown in Figure 1.1.

 

The main construction activities carried out during the reporting month and the corresponding environmental mitigation measures are summarized in Table 1.1. The implementation of major mitigation measures in the month is provided in Appendix I.

 

Table 1.1 Construction Activities and Their Corresponding Environmental Mitigation Measures

 

Item

Construction Activities

Environmental Mitigation Measures

Unit L13 Foundation Works

1.

Bored Pile Work

Air

-        Dust suppression in the main haul road.

-        Using ULSD for PMEs.

-        Cover dusty stockpile with tarpaulin and water spraying.

Noise

-        General noise mitigation measure employed at all work sites throughout the construction phase.

Wastewater

-        Wastewater should be pumped to the sedimentation ponds for desilting process. After that, wastewater will be re-used for construction activities or pumped for storage.

Waste Management

-        Waste Management Plan submitted and implemented

-        Construction waste will be store in the proposed storage area for recycled or disposal

 

1.4          Summary of EM&A Requirements

 

The detailed EM&A monitoring work for air quality and noise are described in Sections 2 and 3 respectively. Regular environmental site audits for air quality, noise, water quality and waste management were carried out.

 

The following environmental audits are summarized in Section 4 of this report:

 

          Environmental monitoring results;

          Waste Management Records;

          Weekly site audit results;

          The status of environmental licensing and permits for the Project;

          The implementation status of environmental protection and pollution control/ mitigation measures.

 

Future key issues will be reported in Section 5 of this report.


 

 

Figure 1.1 Layout of Work Site



2.             AIR QUALITY

 

2.1          Monitoring Requirements

 

1-hour and 24-hour TSP monitoring at agreed frequencies were conducted to monitor air quality. The impact monitoring data were checked against the Action/Limit Levels as determined in the Baseline Monitoring Report (Construction Phase). Appendix B shows the established Action/Limit Levels for Air Quality.

 

2.2          Monitoring Locations

 

Three dust monitoring locations were selected for 1-hour TSP sampling (AM1, AM2 & AM3) while four monitoring locations were selected for 24-hour TSP sampling (AM1, AM2, AM3 and AM4). Table 2.1 tabulates the monitoring stations. The locations of the monitoring stations are shown in Figure 2.1.

 

Table 2.1 Air Quality Monitoring Locations

 

Location I.D.

Description

AM1

Reservoir

AM2

East Gate

AM3

Ash Lagoon

AM4

Tai Yuen Village

 

2.3          Monitoring Equipment

 

It is agreed with EPD that continuous 24-hour TSP air quality monitoring would be performed using TEOM continuous dust monitor and the MINIVOL Portable Sampler at AM1,2&3 and AM4 respectively. TEOM continuous dust monitors were used to carry out 1-hour TSP monitoring at AM1, AM2 and AM3. Table 2.2 summarises the equipment used in dust monitoring.

 

Table 2.2 Air Quality Monitoring Equipment

 

Equipment

Model and Make

24-hour sampling:

 

Continuous TSP Dust Meter

 

 

MINIVOL Portable Sampler

 

1-hour sampling:

Continuous TSP Dust Meter

 

 

TEOM continuous dust monitor

Thermo Scientific

 

AIRMETRICS

 

TEOM continuous dust monitor

Thermo Scientific

 

2.4          Monitoring Parameters, Frequency and Duration

 

Table 2.3 summarises the monitoring parameters, duration and frequency of air quality monitoring. The monitoring schedule for the reporting month is shown in Appendix C.

 

Table 2.3 Air Quality Monitoring Parameter, Duration and Frequency

 

Monitoring Stations

Parameter

Duration

Frequency

AM1

1-hour TSP

1

3 hourly samples every 6 days

24-hour TSP

24

Once every 6 days

AM2

1-hour TSP

1

3 hourly samples every 6 days

24-hour TSP

24

Once every 6 days

AM3

1-hour TSP

1

3 hourly samples every 6 days

24-hour TSP

24

Once every 6 days

AM4

24-hour TSP

24

Once every 6 days

 

2.5          Monitoring Procedures and Calibration Details

 

MINIVOL (24- hour TSP Monitoring):

 

Preparation of Filter Papers

          Visual inspection of filter papers was carried out to ensure that there were no pinholes, tears and creases;

          The filter papers were then labeled before sampling.

          The filter papers were equilibrated at room temperature and relative humidity < 50% for at least 24 hours before weighing.

 

Field Monitoring

          During collection of the sampled filter paper, the information on the elapse timer was logged. Site observations around the monitoring stations, which might have affected the monitoring results, were also recorded. Major pollution sources, if any, would be identified and reported.

          The post-sampling filter papers were removed carefully from the filter holder and folded to avoid loss of fibres or dust particles from the filter papers;

          The filter holder and its surrounding were cleaned;

          A pre-weighed blank filter paper for the next sampling was put in place and aligned carefully. The filter holder was then tightened firmly to avoid leakage;

          The programmable timer was set for the next 24 hrs sampling period;

          The post-sampling filter papers were equilibrated at room temperature and relative humidity < 50% for at least 24 hours before weighing.

 

TEOM continuous dust monitor (24- hour TSP and 1- hour TSP Monitoring):

          The following parameters of the TEOM model dust meters are regularly checked to ensure proper functionality:

 

o   Operation Mode;

o   Frequency of the tapered element;

o   Main flow;

o   Bypass flow.

 

Maintenance & Calibration

          The monitoring equipment and their accessories are maintained in good working conditions.

          Monitoring equipment is calibrated at monthly intervals. Calibration details are shown in Appendix F.

 

2.6          Results and Observations

 

All dust monitoring works were conducted on schedule. All monitoring data and graphical presentation of the monitoring results are provided in Appendix D. Key findings and observations are provided below:

 

1-hour TSP

 

No exceedance of 1-hour TSP Action/Limit Level was recorded in the month.

 

24-hour TSP

 

No exceedance of 24-hour TSP Action/Limit Level was recorded in the month.


 

Figure 2.1 Location of Air Quality Monitoring Stations


3.             NOISE

 

3.1          Monitoring Requirements

 

Continuous noise alarm monitoring at Ash Lagoon/Ching Lam were carried out to calculate the noise contributed by the construction activities at the two critical NSR’s, viz. Long Tsai Tsuen/Hung Shing Ye and the school within the village of Tai Wan San Tsuen. The impact monitoring data for construction noise were checked against the limit levels specified in the EM&A Manual. With the availability of the construction noise permits, impact monitoring for the construction work during the restricted hours was also carried out. Section 3 presents the details of the construction noise permits.

 

The impact noise monitoring data were checked against the limit levels specified in the EM&A Manual. Appendix B shows the established Action/Limit Levels for noise.

 

3.2          Monitoring Locations

 

In accordance with the EM&A manual, the identified noise monitoring locations of Ash Lagoon and Ching Lam are shown in Figure 3.1.

 

3.3          Monitoring Equipment

 

The sound level meters used for noise monitoring complied with International Electrotechnical Commission Publications 651:1979 (Type 1) and 804:1985 (Type 1). The noise monitoring equipment used is shown in Table 3.1.

 

Table 3.1 Noise Monitoring Equipment

 

Equipment

Model

Sound level meters

B&K 2250

Sound level calibrator

B&K 4231

 

3.4          Monitoring Parameters, Frequency and Duration

 

Continuous alarm monitoring was carried out at Ash Lagoon and Ching Lam. The measurement duration and parameter of noise monitoring were presented in Table 3.2 as follows:

 

Table 3.2 Noise Monitoring Duration and Parameter

 

Location

Time Period

Frequency

Parameter

Ash Lagoon

 

 

 

Ching Lam

Day-time:

0700-1900 hrs on normal weekdays

 

Evening-time & holidays:

0700-2300 hrs on holidays; and 1900-2300 hrs on all other days

 

Night-time:

2300-0700 hrs of next day

Day-time:

30 minutes

 

 

Evening-time & holidays:

5 minutes

 

 

Night-time:

5 minutes

30-min LAeq

 

 

5-min LAeq

 

 

5-min LAeq

 

3.5          Monitoring Procedures and Calibration Details

 

Monitoring Procedures

 

Continuous Noise Monitoring for Lamma Extension Construction

 

The measured noise levels (MNL's) were collected at the noise alarm monitoring stations at Ash Lagoon and Ching Lam. The notional background noise levels (viz. baseline noise data at Ash Lagoon and Ching Lam) were applied to correct the corresponding MNL's in 30-min/5-min LAeq.

 

A wind speed sensor was installed at Station Building Rooftop. The wind speed signal was used to determine whether the data from Ash Lagoon and Ching Lam noise alarm monitoring stations were affected. The instantaneous data was discarded in case the instantaneous wind speed exceeded 10 m/s. The 30-min/5-min LAeq was considered valid only if the amount of valid data was equal to or above 70%.

 

Equipment Calibration

 

The sound level meters and calibrators were verified by the manufacturer or accredited laboratory. With the endorsement of the Independent Environmental Checker, the enhancement of calibration of sound level meter at the noise monitoring stations was implemented. The monthly manual on-site calibration using sound level calibrator was replaced by the daily auto charge injection calibration function of the sound level meter. For additional quality assurance, manual on-site calibration would still be conducted for the noise monitoring stations once every 6 months. The manual on-site calibrations for Ash Lagoon and Ching Lam noise monitoring stations were both carried out in March 2024. The next calibrations for the two corresponding noise monitoring stations were both scheduled in September 2024.

 

3.6          Results and Observations

 

Continuous noise monitoring was conducted at the two monitoring stations at Ash Lagoon and Ching Lam.

 

All monitoring results and their graphical presentations are provided in Appendix E. No exceedance of noise Action/Limit Level was recorded in the month.


 

Figure 3.1 Location of Noise Monitoring Stations


4.             ENVIRONMENTAL AUDIT

 

4.1          Review of Environmental Monitoring Procedures

 

The environmental monitoring procedures were regularly reviewed by the Environmental Team. No modification to the existing monitoring procedures was recommended.

 

4.2          Assessment of Environmental Monitoring Results

 

Monitoring results for Air Quality and Noise

 

The environmental monitoring results for Air Quality and Noise in the reporting month presented in Sections 2 and 3 respectively are summarized in Table 4.1.

Table 4.1 Summary of AL Level Exceedances on Monitoring Parameters

 

Item

Parameter Monitored

Monitoring Period

No. of Exceedances In

Event/Action Plan Implementation Status and Results

Action Level

Limit

Level

Air

1

Ambient TSP

(24-hour)

01/04//2024-

30/04/2024

0

0

 

2

Ambient TSP

(1-hour)

01/04//2024-

30/04/2024

0

0

 

Noise

1

Noise level at the critical NSR’s predicted by the noise alarm monitoring system

01/04//2024-

30/04/2024

0

0

 

 

4.3          Waste Management

 

Wastes generated from this Project include inert construction and demolition (C&D) materials and non-inert C&D materials. Inert C&D materials comprise excavated materials and broken concrete. Non-inert C&D materials comprise general refuse, metals and paper/ cardboard packaging, plastics, chemical waste, etc.

 

Inert C&D material and non-inert C&D material disposed of in April 2024 are shown in Table 4.2.

 

Table 4.2 Estimated Amounts of Waste in April 2024

 

Total Inert C&D Waste Materials

Non-inert C&D Materials

C&D Materials Recycled

C&D Waste Disposed of at Landfill

Chemical Waste

8,328.84 Tonnes

0 Tonnes

44.23 Tonnes*

0 Tonnes

Note: * - Remaining C&D waste disposed of at landfill from Unit L12 in the reporting month.

 

The monthly waste flow tables prepared by the contractors are attached in Appendix K

 

4.4          Site Environmental Audit

 

Site audits were carried out by ET on a weekly basis to monitor environmental issues at the construction sites to ensure that all mitigation measures were implemented timely and properly. The site audit findings for the reporting month are summarized in Appendix H. The site conditions were generally satisfactory. All required mitigation measures were implemented.

 

4.5          Status of Environmental Licensing and Permitting

 

All permits/licenses obtained for the project are summarised in Table 4.3.

 

Table 4.3 Summary of Environmental Licensing and Permit Status

 

Description

Permit No.

Valid Period

Highlights

Status

From

To

Varied Environmental Permit

EP-071/2000/D

 

 

 

28/09/20

 

-

The whole construction work site

Valid

Waste Disposal Billing Account

Account No.: 7038672

27/10/20

-

Civil works for Unit L12 No.5 C.W. intake and cable bridge

Valid

Waste Disposal Billing Account

Account No.: 7039272

08/01/21

-

Civil and building works for Unit L12

Valid

Waste Disposal Billing Account

Account No.: 7049726

09/01/24

-

Foundation works for Unit L13

Valid

 

4.6          Implementation Status of Environmental Mitigation Measures

 

Mitigation measures detailed in the permits and the EM&A Manual (Construction Phase) are required to be implemented. An updated summary of the Environmental Mitigation Implementation Schedule (EMIS) is presented in Appendix I.

 

4.7          Implementation Status of Event/Action Plans

 

The Event/Action Plans extracted from the EM&A Manual (Construction Phase) are presented in Appendix G.

 

4.8          Implementation Status of Environmental Complaint Handling Procedures

 

In April 2024, no complaint in relation to the environmental impact of the construction activities was received.

 

Table 4.4 Environmental Complaints Received in April 2024

 

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /

Actions Taken

Conclusion /

Status

Nil

N/A

N/A

 

Table 4.5 Outstanding Environmental Complaints Carried Over

 

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /

Actions Taken

Conclusion /

Status

 

Nil

 

 

N/A

 

N/A




5.             FUTURE KEY ISSUES

 

5.1          Key Issues for the Coming Month

 

Key issues to be considered in the coming month include:

 

Unit L13 Foundation Works

 

Noise Impact

          To continue executing the preventive measures for avoiding noise exceedance and keep monitoring/ reviewing the noise performance.

 

Air Impact

          To monitor and review the sufficiency of the dust suppression measures provided and increase the resources accordingly if necessary.

 

Water Impact

          To treat wastewater in sedimentation pit and tanks for reuse on water spraying.

 

5.2          Monitoring Schedules for the Next 3 Months

 

The tentative environmental monitoring schedules for the next 3 months are shown in Appendix C.

 

5.3          Construction Program for the Next 3 Months

 

The tentative construction programs for the next 3 months are shown in Appendix JAppendix J.



6.             CONCLUSION

 

All monitoring work at designated stations was performed as scheduled satisfactorily. The environmental monitoring works and site inspection were performed as scheduled in the reporting month. All monitoring results were checked and reviewed.

 

No Action/Limit level exceedance on 1-hour and 24-hour TSP level was recorded in the reporting month.

 

No Action/Limit level exceedance on noise was recorded in the reporting month.

 

Environmental mitigation measures recommended in the EM&A manual for the construction activities were implemented in the reporting month. No complaint in relation to the environmental impact of the construction activities was received in the reporting month. No prosecution was received for this Project in the reporting period.

 

The environmental performance of the Project was generally satisfactory.