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  7

2.             AIR QUALITY.. 12

2.1       Monitoring Requirements  12

2.2       Monitoring Locations  12

2.3       Monitoring Equipment 13

2.4       Monitoring Parameters, Frequency and Duration  14

2.5       Monitoring Procedures and Calibration Details  14

2.6       Results and Observations  15

3.             NOISE.. 16

3.1       Monitoring Requirements  16

3.2       Monitoring Locations  16

3.3       Monitoring Equipment 17

3.4       Monitoring Parameters, Frequency and Duration  17

3.5       Monitoring Procedures and Calibration Details  17

3.6       Results and Observations  18

4.             ENVIRONMENTAL AUDIT.. 21

4.1       Review of Environmental Monitoring Procedures  21

4.2       Assessment of Environmental Monitoring Results  21

4.3       Site Environmental Audit 22

4.4       Status of Environmental Licensing and Permitting  22

4.5       Implementation Status of Environmental Mitigation Measures  25

4.6       Implementation Status of Event/Action Plans  25

4.7       Implementation Status of Environmental Complaint Handling Procedures  25

5.             FUTURE KEY ISSUES. 27

5.1       Status of Natural Gas supply  27

5.2       Key Issues for the Coming Month  27

5.3       Monitoring Schedules for the Next 3 Months  28

5.4       Construction Program for the Next 3 Months  29

6.             CONCLUSION.. 30

 


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 Locations

Table 3.2          Noise Monitoring Equipment

Table 3.3          Noise Monitoring Duration and Parameter

Table 4.1          Summary of AL Level Exceedances on Monitoring Parameters

Table 4.2          Estimated Amounts of Waste Generated in August 2005

Table 4.3          Summary of Environmental Licensing and Permit Status

Table 4.4          Environmental Complaints / Enquiries Received in August 2005

Table 4.5          Outstanding Environmental Complaints / Enquiries Carried Over

 

 

List of figures

 

Figure 1.1         Layout of Work Site

Figure 1.2         Cable Route of Transmission System

Figure 1.3         Location of Dumping Area (South Cheung Chau Spoil Disposal Area)

Figure 1.4         Location of Dumping Area (East Sha Chau Contaminated Mud Disposal Site)

Figure 2.1         Location of Air Quality Monitoring Stations

Figure 3.1         Location of Noise Monitoring Stations

Figure 3.2         Location of Manual Noise Monitoring

 

 

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 August 2005

Appendix E      Noise Monitoring Results for August 2005

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     Supply and Installation of Submarine Gas Pipeline – Monthly EM&A Report for August 2005 prepared by the Consultant as one of the ET Members

 

 

                                                                                                         

 



EXECUTIVE SUMMARY

 

This is the fifty-third 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 August 2005.

 

After successful completion of post-project monitoring in September 2002, no further marine water quality monitoring for the reclamation works would be required.

 

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 L9 Civil and Building Works

Main Station Building, 275kV Switching Station, Shunt Reactor, Chimney, Drainage & Road, Fire Services Water Tank and Fire Pump House, C.W. Culvert System & Equipment Room, C.W. Pump Equipment Room, Gas Receiving Station, Pipe & Cable Rack and Lamma Power Station Addition and Alteration (LPS A&A) Works

Unit L9 Mechanical Erection

Erection of HRSG, Steam Turbine, Gas Turbine, Generator, Condenser, Aux Equipment, Air duct / Inlet Filter, HRSG Inlet Duct and Piping Support / Piping Erection; Insulation Work; and Installation of Platform, Pipe Rack and Intake Aux Equipment

Unit L9 Electrical, Instrumentation & Control Erection

Busduct Installation, Control Panel/Marshalling Panel/Battery & Rack Installation, Cable Tray & Earthing Installation and Cable Laying & Termination and Transformer Installation

275kV Switching Station Erection

Materials Delivery & Installation of GIS and Shunt Reactors

Transmission System

Site formation work and tunnel excavation at the Lamma Power Station Cable Duct No.1, cable landing points N2, N4 & N5, filling of Type 2 and Type 1 rockfill at N2 and N4 respectively

Gas Pipeline

Rock Dumping

Miscellaneous

Slurry ash piping & filling

 


Environmental Monitoring Works

 

One (1) dust monitoring event was re-scheduled in the reporting month as shown in the following table:

 

Monitoring work

Monitoring Location

Original Schedule

Makeup Sampling

Reasons

24 hour TSP sampling

AM2

29/08/2005

31/08/2005

Failure of  TSP sampler.

 

Other than the above incident, 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

 

Construction work for Lamma Extension was carried out during the restricted hours including evening-time, holidays and night-time under valid Construction Noise Permits.  No exceedance of Action and Limit levels for noise arising from the construction of Lamma Extension and transmission system was recorded in the month. 

 

Site Environmental Audit

 

Independent Environmental Checker (IEC) conducted a site inspection on 24/08/2005.  The inspection result is attached in Appendix H.

 

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

 

Environmental Licensing and Permitting

 

Description

Permit No.

Valid Period

Issued To

Date of Issuance

From

To

Varied Environmental Permit

EP-071/2000/C

18/05/05

-

HEC

18/05/05

Construction Noise Permit

GW-RS0097-05

21/02/05

09/08/05

Contractor

18/02/05

Construction Noise Permit

GW-RE0018-05

25/02/05

24/08/05

Contractor

07/02/05

Construction Noise Permit

GW-RS0013-05

25/02/05

24/08/05

Contractor

21/02/05

Construction Noise Permit

GW-RN0062-05

02/03/05

01/09/05

Contractor

01/03/05

Construction Noise Permit

GW-RS0139-05

17/03/05

16/09/05

Contractor

17/03/05

Construction Noise Permit

GW-RS0146-05

21/03/05

20/09/05

Contractor

21/03/05

Construction Noise Permit

GW-RS0242-05

29/04/05

28/09/05

Contractor

27/04/05

Construction Noise Permit

GW-RS0243-05

29/04/05

28/09/05

Contractor

27/04/05

Construction Noise Permit

GW-RS0246-05

29/04/05

09/10/05

Contractor

29/04/05

Construction Noise Permit

GW-RS0317-05

26/05/05

25/11/05

Contractor

26/05/05

Construction Noise Permit

GW-RS0318-05

26/05/05

25/11/05

Contractor

26/05/05

Construction Noise Permit

GW-RS0416-05

10/07/05

09/01/06

Contractor

30/06/05

Construction Noise Permit

GW-RS0424-05

15/07/05

14/01/06

Contractor

07/07/05

Dumping Permit

EP/MD/05-051

01/03/05

31/08/05

Contractor

28/01/05

Dumping Permit

EP/MD/05-115

01/03/05

31/08/05

Contractor

22/02/05

Dumping Permit

EP/MD/06-025

03/08/05

02/09/05

Contractor

01/08/05

Registration of Chemical Waste Producer

WPN5213-912-P2781-07

11/06/04

-

Contractor

11/06/04

Registration of Chemical Waste Producer

WPN5213-912-K2801-03

15/09/04

-

Contractor

15/09/04

Registration of Chemical Waste Producer

WPN5517-912-T2007-01

08/12/92

-

Contractor

08/12/92

Registration of Chemical Waste Producer

WPN5213-912-W2852-09

25/01/05

-

Contractor

25/01/05

Registration of Chemical Waste Producer

WPN4111-912-M2534-09

20/06/05

-

Contractor

20/06/05

WPCO Discharge Licence

EP890/W2/XD020

22/11/04

30/11/09

Contractor

22/11/04

 

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 against 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 L9 Civil and Building Works

 

-         to continue monitoring the noise level during construction and to ensure compliance with the CNP’s already obtained;

-         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;

 

Unit L9 Mechanical Erection

 

-         to continue monitoring the noise level during construction

-         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;

 

Unit L9 Electrical Erection

 

-         to continue monitoring the noise level during construction

-         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;

 

275KV Switching Station Erection

 

-         to continue monitoring the noise level during construction

-         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;

 

Transmission System

 

-         to continue monitoring the noise level during construction;

-         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 closely monitor the construction activities in order to avoid disturbance to the rare plants; 

-         to provide temporary fire fighting equipment for prevention of fire within the work sites.

 

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/C, 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. As the post-project marine water monitoring was successfully completed in September 2002, no further water quality monitoring for the reclamation works 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 new 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 August 2005.

 

 

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 L9 civil and building works were for the Main Station Building, 275kV Switching Station, Shunt Reactor, Chimney, Drainage & Road, Fire Services Water Tank and Fire Pump House, C.W. Culvert System & Equipment Room, C.W. Pump Equipment Room, Gas Receiving Station, Pipe & Cable Rack and LPS A&A Works. Construction activities for Unit L9 mechanical works were the erection of HRSG, Steam Turbine, Gas Turbine, Generator, Condenser, Auxiliary Equipment, Air duct / Inlet Filter, HRSG Inlet Duct, Piping Support / Piping, Insulation Work, and installation of Platform, Pipe Rack, and Intake Auxiliary Equipment.  Construction activities for Unit L9 electrical, instrumentation & control erection were Busduct installation, Control Panel / Marshalling Panel / Battery & Rack installation, Cable Tray & Earthing installation, Cable Laying & Termination and Transformer Installation.  The construction activities for 275KV Switching Station erection were materials delivery & installation of GIS and Shunt Reactors.  Construction activities for Unit L9’s associated transmission system were site formation work and tunnel excavation at the Lamma Power Station Cable Duct No.1, cable landing points N2, N4 & N5, and Type 2 and Type 1 rockfill at N2 and N4 respectively and the dredging/excavation of submarine cable trench outside I1 and N5 Landing Points.  A separate monthly EM&A report for submarine pipeline prepared by the consultant, as one of ET members, is shown in Appendix K.  Layout plans for construction site and transmission system are shown in Figure 1.1 and Figure 1.2 respectively.  Uncontaminated and contaminated materials were dumped at the assigned locations within the South Cheung Chau Spoil Disposal Area and East Sha Chau Contaminated Mud Disposal Site respectively.  Figure 1.3 and Figure 1.4 show the dumping locations in August 2005.

 

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 L9 Civil and Building Works

1.

Main Station Building

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

2.

275kV Switching Station

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

3.

Shunt Reactor

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

4.

Chimney

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

5.

Drainage & Road Works

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

6.

Fire Services Water Tank and Fire Pump House

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

7.

C.W. Culvert System & Equipment Room

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

8.

C.W. Pump Equipment Room

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

9.

Gas Receiving Station

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

10.

Pipe & Cable Rack

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

11.

LPS A&A Works

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

Construction of Transmission System

12.

Site formation work and tunnel excavation at the Lamma Power Station Cable Duct No.1, cable landing points N2, N4 & N5

Air Quality

-                   Dust suppression measures implemented.

 

Noise

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

 

Terrestrial Ecology

-                   Special care and close monitoring to avoid disturbances to the rare plant species.

-                   Temporary fire fighting equipment provided within the work area during construction.

13.

Filling Type 2 and Type 1 rockfill at N2 and N4 respectively

Noise

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

Unit L9 Mechanical Erection

14.

HRSG Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

15.

Steam Turbine Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

16.

Gas Turbine Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

17.

Generator Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

18.

Condenser Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

19.

Auxiliary Equipment Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

20.

Air duct / Inlet Filter

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

21.

HRSG Inlet Duct

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

22.

Piping Support / Piping Erection

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

23.

Insulation Work

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

24.

Platform Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

25.

Pipe Rack Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

26.

Intake Aux Equipment Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

Unit L9 Electrical, Instrumentation & Control Erection

27.

Busduct Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

28.

Control Panel/ Marshalling Panel/Battery & Rack Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

29.

Cable Tray & Earthing Installation

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

30.

Cable Laying & Termination

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

275kV Switching Station Erection

31.

Materials Delivery & Installation of GIS and Shunt Reactors

Air

-                   Dust suppression measures implemented.

 

Noise

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

 

Waste Management

-                   Waste Management Plan submitted and implemented.

Miscellaneous

32.

Slurry ash piping & filling

Noise

-                   General noise mitigation measures implemented and silent type equipment deployed.

 

 

1.4         Summary of EM&A Requirements

 

The EM&A program requires environmental monitoring for air, noise and water quality. As the post-project marine water monitoring was successfully completed in September 2002, no further water quality monitoring for the reclamation works would be required. 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


 

 

 

Figure 1.2    Cable Route of Transmission System


 

Figure 1.3 Location of Dumping Area (South Cheung Chau Spoil Disposal Area)


 

Figure 1.4  Location of Dumping Area (East Sha Chau Contaminated Mud Disposal 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

 

Continuous 24-hour TSP air quality monitoring was performed using the GS2310 High Volume Air Samplers (HVAS), Partisol Model 2000 Sampler and the MINIVOL Portable Sampler at AM1&2, AM3 and AM4 respectively.  TEOM Model 1400a 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:

HVAS Sampler

 

 

Partisol Air Sampler

 

 

MINIVOL Portable Sampler

 

1-hour sampling:

Continuous TSP Dust Meter

 

Model GS2310

Anderson Instruments Inc.

 

Partisol Model 2000

Rupprecht & Patashnick

 

AIRMETRICS

 

 

TEOM Model 1400a

Rupprecht & Patashnick

 

 

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

 

24- hour TSP Monitor:

 

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 flow record chart for the previous sampling was checked to see if there was any abnormality.

          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;

          A new flow record chart was loaded into the flow recorder;

          The programmable timer was set for the next 24 hrs sampling period, ! 1/2 hr;  

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

 

1- hour TSP Monitor:

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

 

o       Mass concentration;

o       Total mass;

o       Frequency of the tapered element;

o       Electrical noise;

o       Main flow;

o       Auxiliary 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

 

One (1) dust monitoring events was re-scheduled in the reporting month as shown in the following table:

 

Monitoring work

Monitoring Location

Original Schedule

Makeup Sampling

Reasons

24 hour TSP sampling

AM2

29/08/2005

31/08/2005

Failure of TSP sampler.

 

Apart from the above incidents, 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 4 presents the details of the construction noise permits. 

 

Manual noise measurements at Pak Kok Tsui residences were carried out for the construction work of Transmission System in this reporting month.  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 are listed in Table 3.1 and shown in Figure 3.1 and Figure 3.2.

 

Table 3.1    Noise Monitoring Locations

 

Purpose of noise monitoring

Monitoring Location

Lamma Extension

Ash Lagoon

Lamma Extension

Ching Lam

Transmission System

Pak Kok Tsui residences (No.2 and No.8)

 

 

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 3.2.

 

Table 3.2            Noise Monitoring Equipment

 

Equipment

Model

Lamma Extension

Transmission System

Sound level meter

Rion NA-27/

B&K 2238F

Rion NL-31/

ACO 6224

Sound level calibrator

Rion NC-74

ACO 2126

 

3.4         Monitoring Parameters, Frequency and Duration

 

Continuous alarm monitoring of A-weighted Leq levels was carried out at Ash Lagoon and Ching Lam while manual noise monitoring was conducted at Pak Kok Tsui residences.  The measurement duration and parameter of noise monitoring were presented in Table 3.3 as follows:

 

 

Table 3.3    Noise Monitoring Duration and Parameter

 

Location

Time Period

Frequency

Parameter

Ash Lagoon

 

 

 

Ching Lam

Daytime:

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

Daytime:

30 minutes

 

 

Evening-time & holidays:

5 minutes

 

 

Night-time:

5 minutes

30-min LAeq

 

 

5-min LAeq

 

 

5-min LAeq

Pak Kok Tsui residences

0700-1900 hrs on normal weekdays

Twice per week

30-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%. 

 

When calibrating the noise measuring equipment, all observations around the monitoring stations, which might have affected the monitoring results, were recorded.

 

Manual Noise Monitoring for Transmission System Construction

 

Manual noise measurements were carried out at the Pak Kok Tsui residences in accordance with standard acoustical principles and practices for checking the impact of noise related to construction of the Transmission System.

 

Hand‑held anemometer was used to measure the wind speed while taking noise measurements.  If the wind speed is excessive, noise data will be discarded and re-measured.

 

Equipment Calibration

 

The sound level meters and calibrators have been verified by the manufacturer or accredited laboratory.  Equipment for continuous noise monitoring was calibrated at site on a monthly basis. 

 

The sound level meters used for manual noise measurement were calibrated with a sound level calibrator immediately before and after noise measurement in accordance with the relevant Technical Memoranda under the Noise Control Ordinance.  Calibration details are shown in Appendix F.

 

 

3.6         Results and Observations

 

Continuous noise monitoring was conducted at the two monitoring stations at Ash Lagoon and Ching Lam while manual noise monitoring was carried out at the Pak Kok Tsui residences. 

 

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


 

 

Figure 3.2    Locations of Manual Noise Monitoring


 


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, 3 and 4 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)

01/08/05-

31/08/05

0

0

 

2

Ambient TSP

(1-hour)

01/08/05-

31/08/05

0

0

 

Noise

1

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

01/08/05-

31/08/05

 

 

 

0

0

 

2

Manual noise monitoring at the Pak Kok Tsui residences

01/08/05-

31/08/05

 

 

0

0

 

 

 

Waste Management Records

 

The estimated amounts of different types of waste generated in August 2005 are shown in Table 4.2.


 

Table 4.2    Estimated Amounts of Waste Generated in August 2005

 

Waste Type

Examples

Estimated Amount

Construction Waste

Concrete Waste, Used formwork, reinforcement and wooden waste

34.5 Tonne

204.3 m3

General Refuse

Domestic wastes collected on site

30 Tonne

 

 

4.3         Site Environmental Audit

 

IEC conducted a site inspection on 24/08/2005.  The inspection result is attached in Appendix H.

 

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 conditions were generally satisfactory.  All required mitigation measures were implemented.  The weekly site inspection results are attached in Appendix H.

 

 

4.4         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/C

 

 

 

18/05/05

 

-

The whole construction work site

Valid

Construction Noise Permit

GW-RS0097-05

 

 

 

 

 

 

 

 

 

 

 

 

 

 

21/02/05

09/08/05

Operation of PME’s allowed during the restricted hours (general holidays including Sundays between 0700-0700 hrs on next day and any day not being a holiday between 1900-0700 hrs on next day).

 

6 groups (A-F) of PME’s are assigned.  Only one group can be used.  Groups A-E are restricted to general holidays including Sundays between 0700-2300 hrs and any day not being a general holiday between 1900-2300 hrs.

 

Valid

Construction Noise Permit

GW-RE0018-05

 

 

 

 

25/02/05

24/08/05

Operation of PME’s allowed during the restricted hours  (general holiday including Sundays between 0700-0700 hrs on next day and any day not being a general holiday between 1900-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RS0013-05

 

 

 

 

25/02/05

24/08/05

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-0700 hrs on next day and any day not being a holiday between 1900-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RN0062-05

 

 

 

 

02/03/05

01/09/05

Operation of PME’s allowed during the restricted hours  (general holiday including Sundays between 0700-0700 hrs on next day and any day not being a general holiday between 1900-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RS0139-05

 

 

 

 

17/03/05

16/09/05

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-2300 hrs and any day not being a general holiday between 1900-2300 hrs).

 

Valid

Construction Noise Permit

GW-RS0146-05

 

 

 

 

21/03/05

20/09/05

Operation of PME’s allowed during the restricted hours  (any day between 2300-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RS0242-05

 

 

 

 

29/04/05

28/09/05

Operation of PME’s allowed during the restricted hours  (any day between 2300-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RS0243-05

 

 

 

 

29/04/05

28/09/05

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-2300 hrs and any day not being a general holiday between 1900-2300 hrs).

 

Valid

Construction Noise Permit

GW-RS0246-05

 

 

 

 

29/04/05

09/10/05

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-1900 hrs and any day not being a general holiday between 1900-2100 hrs).

 

Valid

Construction Noise Permit

GW-RS0317-05

 

 

 

 

26/05/05

25/11/05

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-2300 hrs and any day not being a general holiday between 1900-2300 hrs).

 

Valid

Construction Noise Permit

GW-RS0318-05

 

 

 

 

26/05/05

25/11/05

Operation of PME’s allowed during the restricted hours  (any day between 2300-0700 hrs on next day).

 

Valid

Construction Noise Permit

GW-RS0416-05

 

 

 

 

10/07/05

09/01/06

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-2300 hrs and any day not being a general holiday between 1900-2300 hrs).

 

Valid

Construction Noise Permit

GW-RS0424-05

 

 

 

 

15/07/05

14/01/06

Operation of PME’s allowed during the restricted hours  (general holidays including Sundays between 0700-0700 hrs on next day and any day not being a holiday between 1900-0700 hrs on next day).

 

Valid

Dumping Permit

EP/MD/05-051

01/03/05

31/08/05

Dumping at South Cheung Chau Disposal Area; Supply and Installation of Submarine and Land Cables

 

Valid

Dumping Permit

EP/MD/05-115

01/03/05

31/08/05

Dumping at South Cheung Chau Disposal Area; Supply and Installation of Submarine and Land Cables

 

Valid

Dumping Permit

EP/MD/06-025

03/08/05

02/09/05

Dumping at East Sha Chau Contaminated Mud Disposal Area; Supply and Installation of Submarine and Land Cables

Valid

Registration of Chemical Waste Producer

WPN5213-912-P2781-07

11/06/04

-

Major Chemical Waste Type: Spent lubrication oil, waste car battery, paint or thinner contaminated container

 

Valid

Registration of Chemical Waste Producer

WPN5213-912-K2801-03

15/09/04

-

Major Chemical Waste Type: Spent lubricating oil, spent battery, contaminated soil with spent flammable liquid

 

Valid

Registration of Chemical Waste Producer

WPN5517-912-T2007-01

08/12/92

-

Major Chemical Waste Type for the construction work:  lubrication oil and paints

 

Valid

Registration of Chemical Waste Producer

WPN5213-912-W2852-09

25/01/05

-

Major Chemical Waste Type: spent mineral oil/ lubricating oil, spent solvents, spent batteries and surplus paint

 

Valid

Registration of Chemical Waste Producer

WPN4111-912-M2534-09

20/06/05

-

Major Chemical Waste Type: spent insulation oil for transformer

 

Valid

WPCO Discharge Licence

EP890/W2/XD020

 

 

22/11/04

30/11/09

Toilet for LMX construction site

Valid

 

 

4.5         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.

 

 

4.6         Implementation Status of Event/Action Plans

 

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

 

 

4.7         Implementation Status of Environmental Complaint Handling Procedures

 

In August 2005, no complaint against the construction activities was received.

 

Table 4.4    Environmental Complaints / Enquiries Received in August 2005

 

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /Actions Taken

Conclusion /

Status

Nil

 

N/A

N/A

 

 

Table 4.5    Outstanding Environmental Complaints / Enquiries 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         Status of Natural Gas supply

 

Based on current project schedule, HEC anticipates there is no delay in the supply of natural gas.

 

 

5.2         Key Issues for the Coming Month

 

Key issues to be considered in the coming month include:

 

Unit L9 Civil and Building Works

 

Noise Impact

          To continue monitoring the noise level during construction and to ensure compliance with the CNP’s already obtained.

          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.

 

Unit L9 Mechanical Erection

 

Noise Impact

          To continue monitoring the noise level during construction.

          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.

 

Unit L9 Electrical, Instrumentation & Control Erection

 

Noise Impact

          To continue monitoring the noise level during construction.

          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.

 

275KV Switching Station Erection

 

Noise Impact

          To continue monitoring the noise level during construction.

          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.

 

Transmission System

 

Noise Impact

          To continue monitoring the noise level during construction.

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

 

Air Impact

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

 

Terrestrial Ecology Impact

          To closely monitor the construction activities in order to avoid disturbance to the rare plants.

          To provide temporary fire fighting equipment for prevention of fire within the work sites.

 

 

5.3         Monitoring Schedules for the Next 3 Months

 

With the completion of post-project monitoring, no further marine water quality monitoring for the reclamation works is required.

 

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

 


 

5.4         Construction Program for the Next 3 Months

 

The period of construction activity of slurry ash piping & filling is tentatively from 2005 to November 2005.  The tentative construction programs for the next 3 months are shown in Appendix J.Appendix J



6.             CONCLUSION

 

One (1) TSP sample was rescheduled owing to the breakdown of TSP sampler.  Other than this, 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 against 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.