EXECUTIVE SUMMARY

This is the December 2009 monthly Environmental Monitoring and Audit (EM&A) report for the Project “Operation of GT57 Combined Cycle Unit” prepared by the Environmental Team (ET). This report presents the results of impact monitoring on air quality and marine water quality for the said project in December 2009.

The GT57 reliability upgrading work was completed. The commissioning works were conducted in December 2009. Air and water quality monitoring were conducted according to the requirement stated in the EM&A manual. The implementation status of the environmental mitigation measures, Event/Action Plan and environmental complaint handling procedures were also checked.

Environmental Monitoring Works

Environmental monitoring works, as mentioned in the EM&A manual (Operational phase), were performed during the operation of GT57 in the reporting period.

Air Quality

No exceedance of hourly average water injection rate was recorded in the month.

Water Quality

No exceedance of Action and Limit levels for water quality was recorded in the month.

Environmental Licensing and Permitting

Description	Permit/Licence No.	Valid Period		Issued To	Date of Issuance
Description	Permit/Licence No.	From	To	Issued To	Date of Issuance
Environmental Permit	EP-083/2000	04/12/2000	-	HEC	04/12/2000
Specified Processes Licence issued under APCO	L-7-002(7)	01/01/2009	31/12/2010	HEC	31/12/2008
WPCO discharge licence for L1-L9 and GT57*	EP890/W2/XD008 (V.2)	18/12/2006	30/11/2009	HEC	19/12/2006

Notes: * Application for variation / renewal of the WPCO discharge licence was being processed by EPD.

Implementation Status of Environmental Mitigation Measures

Environmental mitigation measures were implemented in the reporting month.

Environmental Complaints

No complaint against the Project was received in the reporting month.

Future key issues

Key issues to be considered in the coming month include:

Air Impact

· To monitor the water injection rate continuously.

· To monitor the fuel sulphur content of the LGO if the combined cycle unit is run on LGO.

Water Impact

· To continuously carry out the water quality monitoring for GT57 as required by the EM&A manual (Operational phase).

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 “Operation of GT57 Combined Cycle Unit” (hereinafter called the “Project”). Under the requirements of Section 5 of Environmental Permit EP-083/2000, an EM&A programme for impact environmental monitoring, as set out in the EM&A Manual (Operational Phase), is required to be implemented. In accordance with the EM&A Manual, environmental monitoring of air quality and water quality are required for the Project.

Figure 1.1 shows the location of the GT57 combined cycle unit. Making use of the open area between the existing gas turbines at the south western corner of Lamma Power Station, a steam-cycle bottoming system was installed to recover the waste heat from the exhaust gas of GT5 and GT7 so as to produce an extra output of 115MW and form a combined cycle unit of a gross output of 365MW. The exhaust gas after passing through the heat recovery steam generator (HRSG) is discharged to the atmosphere through the existing stacks of 80m height. Cooling water required for the steam-cycle bottoming system is supplied from additional C.W. pumps and returned to the existing No.1 C.W. outfall for discharge to the sea. As a result of the additional power output generated by the steam cycle, there is a substantial gain in the overall thermal efficiency from about 30% (in a simple cycle GT) to 46% (in a combined cycle GT).

The additional equipment installed for the project include:

· 2 numbers of heat recovery steam generators;

· 1 steam turbine building to house the steam turbine and auxiliaries;

· Generator and unit transformer; and

· 2 numbers of additional C.W. pumps.

This report summarizes the environmental monitoring and audit work for the Project for the month of December 2009.

1.2 Project Organisation

The management structure to oversee the Project, includes the following:

· Environmental Protection Department (The Authority);

· General Manager (Corporate Development) (The official contact person between HEC and EPD);

· Environmental Team Leader (ET);

· Independent Environmental Checker (IEC);

· Environmental Team (ET).

The organization chart for the Operation EM&A programme is shown in Figure 1.2.

1.3 Summary of EM&A Requirements

The EM&A program requires environmental monitoring for air and water quality. The EM&A monitoring work for air quality and water quality are described in Sections 2 and 3 respectively.

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

· Environmental monitoring results;

· The status of environmental licensing and permits for the Project;

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

The future key issues for the Project will be reported in Section 5 of this report.

2. AIR QUALITY

2.1 Monitoring Requirements

In accordance with the EM&A manual (Operational Phase) for GT57 and the requirements stipulated in the Specified Processes Licence issued under Air Pollution Control Ordinance, water injection rates, sulphur content of fuel burnt (when GT57 is run on light gas oil) are monitored. Various operation parameters (viz generation output and fuel consumption) are reported. Water injection rates were checked against the Action/Limit Levels shown in Appendix B.

The monitoring frequency of various parameters is shown in table 2.1 below:

Table 2.1 Air Quality Monitoring Parameters and Frequency

Parameter	Frequency
Hourly Average Water Injection Rate	Continuous, when GT57 is operating
Sulphur content of fuel	Monthly

Note: The above monitoring requirements is applicable when GT57 is run on natural gas for peak lopping purposes on or before 31 December 2009 in accordance with SP licence L-7-002(7) requirement.

Pursuant to SP licence requirement, installation and commissioning of the GT57 Continuous Emission Monitoring (CEM) systems have been completed and the aforesaid CEMs are under field testing.

2.2 Summary of Results And Observations

GT57 commissioning tests were conducted in December 2009. Monitoring of various parameters as mentioned in section 2.1 above was conducted during the operation of GT57 in the reporting month. A monthly summary of fuel data and Generation Output, as per the requirement stipulated in the SP licence, is shown below:

Table 2.2 Monthly Fuel Data and Generation Output

	GT5	GT7	Steam Turbine	Total
Generation Output (MWH)	1,708.0	1,392.4	185.0	3,285.4
Natural Gas Consumption (MT)	445.3	360.7	-	806.0
Fuel Oil Consumption (MT)	153.7	135.4	-	289.0
Sulphur content of Fuel Oil (%)	0.13	0.13	-	-

* The figures may not sum to total due to rounding.

	GT6
Sulphur content of Fuel (%)	0.13

Summary of Action/Limit Level Alarm in December 2009

No exceedance of Action and Limit levels for hourly average water injection rate was recorded in the month.

3. WATER QUALITY MONITORING

3.1 Monitoring Requirements

In accordance with the EM&A manual (Operational Phase) for GT57, the monitoring requirements for the EM&A work should strictly follow the discharge licence for L1-L9 & GT57 issued under the Water Pollution Control Ordinance (WPCO). The parameters as stated in table 3.1 were monitored and checked against the Action/Limit Levels as given in Appendix B.

Table 3.1 Water Quality Monitoring Parameters and Frequencies for GT57

Item	Parameters	Frequency*
1	Cooling Water Temperature	Daily
2	Cooling Water Temperature Rise	Daily
3	Total Residual Chlorine	Bi-weekly
4	Grease & Oil from Oil Free Drain	Monthly
5	Temperature of Blowdown Effluent (HRSG)	At least twice per year
6	Suspended Solids from Blowdown Effluent (HRSG)	At least twice per year
7	Grease & Oil from Blowdown Effluent (HRSG)	At least twice per year
8	Scum of foam in ambient water	Daily

Remark: * monitoring will only be carried out when there is operation of the GT57.

3.2 Summary of Results And Observations

Monitoring of various parameters as listed in table 3.1 above were carried out during the operation of GT57 in the reporting month. A monthly summary of the data is shown in Appendix C.

The data recorded for the monitoring parameters were all below their corresponding Action/Limit Levels. No AL level exceedance was recorded in the reporting month. There was no foam present within 500 meters of Hung Sing Ye Beach in the reporting month. Details of the foam observation report are also given in Appendix C. The effluent quality was generally satisfactory.

3.3 Implementation Status on Thermal Plume Surveys

No thermal plume survey was carried out in the reporting month. The thermal plume survey would only be conducted under the conditions stipulated in the proposal on the programme and methodologies of thermal plume attached in the EM&A manual (Operational Phase).

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 Water Quality

The environmental monitoring results for Air Quality and Water Quality in December 2009 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
Item	Parameter Monitored	Monitoring Period	Action Level	Limit Level	Event/Action Plan Implementation Status and Results
Air
1	Hourly Average Water Injection Rate	01/12/09-31/12/09	0	0
2	Stack NOx	01/12/09-31/12/09	N.A.^#	N.A.^#
Water
1	Cooling Water Temperature	01/12/09-31/12/09	N.A.	0
2	Cooling Water Temperature Rise	01/12/09-31/12/09	0	0
3	Total Residual Chlorine	01/12/09-31/12/09	0	0
4	Grease & Oil from Oil Free Drain	01/12/09-31/12/09	0	0
5	Temperature of Blowdown Effluent	01/12/09-31/12/09	N.A.	0
6	Suspended Solids from Blowdown Effluent	01/12/09-31/12/09	N.A.	0
7	Grease & Oil from Blowdown Effluent	01/12/09-31/12/09	N.A.	0
8	Inspection of Scum/Foam in ambient water	01/12/09-31/12/09	0	0

Notes: # Monitoring is not required when GT57 is run on natural gas for peak lopping purposes on or before 31 December 2009.

4.3 Status of Environmental Licensing and Permitting

All permits/licenses obtained as of December 2009 are summarised in Table 4.2.

Table 4.2 Summary of Environmental Licensing and Permit Status

Description	Permit / Licence No.	Valid Period		Status
Description	Permit / Licence No.	From	To	Status
Environmental Permit	EP-083/2000	04/12/2000	-	Valid
Specified Processes Licence issued under APCO	L-7-002(7)	01/01/2009	31/12/2010	Valid
WPCO discharge licence for L1-L9 and GT57	EP890/W2/XD008 (V.2)	18/12/2006	30/11/2009	Application for variation / renewal of the licence was being processed by EPD.

4.4 Implementation Status of Environmental Mitigation Measures

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

Table 4.3 Implementation Schedule

Project Profile Ref.	Mitigation Measures	Implementation Status
19	Use of 0.2% sulphur content for oil-firing of the conversion unit.	Complied
19	Use of acoustic enclosures around major noise sources	Complied

4.5 Implementation Status of Event/Action Plans

The Event/Action Plans for air quality and water quality extracted from the EM&A Manual (Operational Phase) are presented in Appendix A.

As no action/limit level exceedance was recorded, no action has been devised.

4.6 Implementation Status of Environmental Complaint Handling Procedures

In December 2009, no complaint against the Project was received.

Table 4.4 Environmental Complaints / Enquiries Received in December 2009

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /

Actions Taken

Conclusion /

Status

Nil

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

Appendix A Event / Action Plans

Table A.1 Event and Action Plans for Air Quality

Exceedance	ET Leader	IEC	Operations Engineer
Action Level
Exceedance of one sample	Identify source; Inform IEC verbally; Repeat measurement to confirm finding.	Check monitoring data submitted by ET and advise ET for any finding.	Rectify any unacceptable practice; Amend any working methods if appropriate.

Exceedance of two or more consecutive samples	Identify source; Inform IEC verbally; Repeat measurement to confirm finding; Increase monitoring frequency; Discuss with Operations Engineers on remedial actions required; If exceedance stops, discontinue additional monitoring.	Check monitoring data submitted by ET and advises ET for any finding; Verify the implementation of the remedial measures;	Discuss with ET on remedial actions required; Implement the agreed remedial actions.
Limit level
Exceedance of one sample	Repeat measurement to confirm finding; Identify the source(s) of the impact. Verbally advise IEC, and inform the EPD of the exceedance, as soon as practicable; Discuss with Operations Engineers on remedial actions required; Increase monitoring frequency; Assess the effectiveness of the remedial actions and keep IEC and EPD informed of the results.	Check monitoring data submitted by ET and advises ET of any finding; Verify the implementation of the remedial measures.	Take immediate action to avoid further exceedances; Discuss with ET on remedial actions required Implement the agreed remedial actions.

Exceedance of two or more consecutive samples	Identify source; Identify the source(s) of the impact. Verbally advise IEC, and inform EPD of the exceedance as soon as practicable; Repeat measurement to confirm finding; Increase monitoring frequency; Carry out analysis on existing control procedures to determine possible mitigation to be implemented; Discuss with Operations Engineers on the remedial actions to be taken; If exceedance stops, discontinue additional monitoring.	Provide feedback and advise ET/Operations Engineers on the effectiveness of the remedial actions proposed by them; Verify the implementation of the remedial measures	Take immediate action to avoid further exceedance Discuss with ET on remedial actions required; Implement the agreed remedial actions; Stop the unit and check the suspected defective parts if the problem still does not come under control.

Table A.2 Event/Action Plan for Water Quality

Exceedance	ET Leader	IEC	Operations Engineer
Action Level
Exceedance on one sampling day	Verbally inform IEC; Repeat in-situ measurement to confirm findings; Identify source(s) of impact.	Check monitoring data submitted by ET and advises ET for any findings.	Rectify unacceptable practice; Amend any working methods if appropriate.
Exceedances on more than one consecutive sampling day	Identify source(s) of impact; Verbally inform IEC; Repeat in-situ measurements to confirm findings; Increase monitoring frequency; Discuss with Operations Engineers on remedial actions required; If exceedance stops, discontinue additional monitoring	Check monitoring data submitted by ET and advises ET for any finding; Verify the implementation of the remedial measures.	Discuss with ET on remedial actions required; Implement the agreed remedial actions.
Limit Level
Exceedance on one sampling day	Repeat measurement to confirm finding; Identify the source(s) of impact. Verbally advise IEC and inform the EPD of the exceedance, as soon as practicable; Discuss with Operations Engineers on remedial actions require; Increase monitoring frequency; Assess the effectiveness of the remedial actions and keep IEC and EPD informed of the results.	Check monitoring data submitted by ET and advises ET for any finding; Verify the implementation of the remedial measures.	Take immediate action to avoid further exceedance; Discuss with ET on remedial actions required; Implement the agreed remedial actions.
Exceedances on more than one consecutive sampling day	Identify the source(s) of impact. Verbally advise IEC, and inform EPD of the exceedance as soon as practicable; Repeat measurement to confirm finding; Increase monitoring frequency; Carry out analysis on existing control procedures to determine possible mitigation to be implemented; Discuss with Operations Engineers on the remedial actions to be taken; If exceedance stops, discontinue additional monitoring.	Provide feedback and advise ET/Operations Engineers on the effectiveness of the remedial actions proposed by them; Verify the implementation of the remedial measures.	Take immediate action to avoid further exceedance; Discuss with ET on remedial actions required; Implement the agreed remedial actions; Stop the unit and check the suspected defective parts if the problem still does not come under control.

Appendix B Action and Limit Levels for Air Quality, Water Quality Monitoring

B.1 Air

Parameter	Action	Limit
Stack NOx (gas firing)	80 mg/Nm3	90 mg/Nm3
Stack NOx (oil firing)	150 mg/Nm³	150 mg/Nm³
Hourly Average Water Injection Rate	Measured Hourly Average Water Injection Rate lower than corresponding Specified Hourly Average water Injection Rate.	Measured Hourly Average Water Injection Rate lower than corresponding Specified Hourly Average water Injection Rate.

Note: Expressed as at 0ºC, 101.325kPa, dry and corrected to 15% O₂ condition.

The Action / Limit level for stack NOx would be revised with more emission data available if deemed necessary.

B.2 Water

Monitoring Area / Location	Parameters to be Monitored	Frequency	Concentration Not to Be Exceeded	Action	Limit	Proposed Action
Trade Effluent Cooling Water	Temperature	Daily, when the combined cycle unit is operating	Temperature at outfall should not exceed that at intake by > 10°C and temperature at outfall should not exceed 40°C	9.5°C	+10°C above intake	Please refer to the event & action plans in Table A.2.
Trade Effluent Cooling Water	Total Residual Chlorine	Bi-weekly, when the combined cycle unit is operating	0.5mg/L	0.47	0.5	Please refer to the event & action plans in Table A.2.
Trade Effluent oil free drain discharge	Grease and Oil	Monthly, when the combined cycle unit is operating	20 mg/L	15	20	Please refer to the event & action plans in Table A.2.
Trade Effluent Boiler Blowdown (HRSG)	Temperature	At least twice per year, when the combined cycle unit is operating	40°C	-	40°C	Please refer to the event & action plans in Table A.2.
	Suspended Solids	At least twice per year, when the combined cycle unit is operating	30 mg/L	-	30
	Grease & Oil	At least twice per year, when the combined cycle unit is operating	20 mg/L	-	20
Marine waters cooling water outfall	Scum of foam in ambient water	Daily, when the combined cycle unit is operating	No scum within 500 m of Hung Shing Ye Beach	When scum passes the station south-west corner and north-west corner	No scum within 500 m of Hung Shing Ye Beach	Please refer to the event & action plans in Table A.2.

Appendix C Summary Results and Observations on Water Quality Monitoring

Maximum Outlet Temperature and Temperature Rise (Deg. Celsius) of Cooling Water at C.W. Outfall No.1 Serving Units L1-L6 & GT57 Condensers

Weighted by Flowrates of Individual Streams (December 2009)

Date

Maximum Outlet Temperature (Deg. Celsius)

Maximum Outlet Temperature Rise

(Deg. Celsius)

31/12/2009

24.5

5.6

Total Residual Chlorine Level at C.W. Outfall No.1 (December 2009)

Date of sampling	31/12
Total Residual Chlorine, mg/L	0.25

Grease & Oil at Oil Free Drain From Oil Interceptor for GT57 (December 2009)

Date of sampling	17/12
Grease & Oil, mg/L	<10

Boiler Blowdown from GT5 & GT7 HRSG to C.W. Outfall No.1 (December 2009)

Date of sampling	17/12	21/12
Source of discharge	GT5	GT7
Suspended Solid, mg/L	17	16
Grease & Oil, mg/L	<10	<10
Temperature, Deg. Celsius	34	35

Remarks:

1. Monitoring will only be carried out when there is operation of the GT57.

2. GT57 Condenser was in service on 31/12/2009.

Observation of Scum Formation in Marine Water Mixing Zone

At Lamma Power Station (December 2009)

Date	Observation
31/12/2009	No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall