COVER

 

Table of Content

 

EXECUTIVE SUMMARY

 

1.                  INTRODUCTION.. 1

1.1         Background  1

1.2         Project Organisation  1

1.3         Plant Availability  2

1.4         Malfunction / Outage Record of Pollution Control Equipment 2

1.5         Summary of EM&A Requirements  2

2.                  AIR QUALITY.. 6

2.1         Monitoring Requirements  6

2.2         Summary of Results And Observations  6

3.                  WATER QUALITY MONITORING.. 8

3.1         Monitoring Requirements  8

3.2         Summary of Results And Observations  8

3.3         Implementation Status on Thermal Plume Surveys  9

4.                  ENVIRONMENTAL AUDIT.. 10

4.1         Review of Environmental Monitoring Procedures  10

4.2         Assessment of Environmental Monitoring Results  10

4.3         Status of Environmental Licensing and Permitting  11

4.4         Implementation Status of Environmental Mitigation Measures  11

4.5         Implementation Status of Event/Action Plans  12

4.6         Implementation Status of Environmental Complaint Handling Procedures  13

5.                  FUTURE KEY ISSUES. 14

5.1         Outage Plan for the coming 3 months  14

5.2         Key issues for the coming month  14

6.                  CONCLUSION.. 15

 

 

 

List of Tables

 

Table 2.1          Air Quality Monitoring Parameters and Frequency

Table 2.2          Monthly Fuel Data and Generation Output

Table 3.1          Water Quality Monitoring Parameters and Frequencies for GT57

Table 4.1          Summary of AL Level Exceedances on Monitoring Parameters

Table 4.2          Summary of Environmental Licensing and Permit Status

Table 4.3          Implementation Schedule

Table 4.4          Environmental Complaints / Enquiries Received in May 2010

Table 4.5          Outstanding Environmental Complaints / Enquiries Carried Over

 

 

 

 

List of figures

 

Figure 1.1         Location of GT57 Combined Cycle Unit

 

Figure 1.2         Organization Chart at Operational Phase

 

 

AppendiX

 

Appendix A      Event/Action Plans

 

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

 

Appendix C      Summary Results and Observations on Water Quality Monitoring

 

 

EXECUTIVE SUMMARY

 

This is the May 2010 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 May 2010.

 

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.

 

Plant Availability

 

Unit GT57 was out of service during the following period:

 

Unit

Period

Remark

GT5

03/05/2010 17:49 to 04/05/2010 10:12

Blade path thermocouple No.4 defect rectification

GT5

06/05/2010 09:28 to 07/05/2010 20:20

Blade path thermocouple No.7 defect rectification

GT7 and Steam Turbine

09/05/2010 21:19 to 10/05/2010 02:00

Boiler Feed Pump stopped due to deaerator level low

GT57

24/05/2010 00:00 to 31/05/2010 23:45

Gas Receiving Station Maintenance work

 

 

Malfunction / Outage Record of Pollution Control Equipment

 

Equipment

Period

Cause

Actions Taken

GT5

Water Injection System

03/05/2010

11:22 to 11:36

GT 5 water injection system was tripped due to the operation of “Blade path temperature spread high alarm.”

Informed EPD by letter dated 05/05/2010.

GT5

Water Injection System

05/05/2010

14:58 to 15:04

GT 5 water injection system was tripped due to the operation of “Blade path temperature spread high alarm.”

Informed EPD by letter dated 07/05/2010.

 

 

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

From

To

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

WT00005923-2010

29/01/2010

30/11/2011

HEC

29/01/2010

 

 

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 NOx emission continuously through the newly installed GT57 CEM System.  

·          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 May 2010.

 

 

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         Plant Availability

 

Unit GT57 was out of service during the following period:

 

Unit

Period

Remark

GT5

03/05/2010 17:49 to 04/05/2010 10:12

Blade path thermocouple No.4 defect rectification

GT5

06/05/2010 09:28 to 07/05/2010 20:20

Blade path thermocouple No.7 defect rectification

GT7 and Steam Turbine

09/05/2010 21:19 to 10/05/2010 02:00

Boiler Feed Pump stopped due to deaerator level low

GT57

24/05/2010 00:00 to 31/05/2010 23:45

Gas Receiving Station Maintenance work

 

 

1.4         Malfunction / Outage Record of Pollution Control Equipment

 

Equipment

Period

Cause

Actions Taken

GT5

Water Injection System

03/05/2010

11:22 to 11:36

GT 5 water injection system was tripped due to the operation of “Blade path temperature spread high alarm.”

Informed EPD by letter dated 05/05/2010.

GT5

Water Injection System

05/05/2010

14:58 to 15:04

GT 5 water injection system was tripped due to the operation of “Blade path temperature spread high alarm.”

Informed EPD by letter dated 07/05/2010.

 

 

1.5         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.

 

 

Figure 1.1    Location of GT57 Combined Cycle Unit

 

Figure 1.2    Organization Structure at Operational Phase of GT57 combined cycle unit

 

 

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

 

At the time of preparation of this monthly EM&A report, the quality assurance test reports for GT57 CEM systems have not yet been endorsed by EPD.  Hence submission of hourly stack NOx data will be pending till EPD endorse the aforesaid reports.

 

2.2         Summary of Results And Observations

 

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)

43,267

49,086

47,318

139,671

Natural Gas Consumption (MT)

11,045

12,511

-

23,557

Fuel Oil Consumption (MT)

0

0

-

0

Sulphur content of Fuel Oil (%)

NA

NA

-

-

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

 

 

 

GT6

Sulphur content of Fuel (%)

0.001

 

 

 

Summary of Action/Limit Level Alarm in May 2010

 

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

 

With the operating of GT57 as a base-load unit since January 2010, the required operating conditions suitable for the thermal plume survey could be available during L9 outage scheduled tentatively in May/June 2010.  In this respect, it had been planned to carry out the thermal survey in May/June 2010 accordingly. 

 

On-site measurement for spring tide was carried out on 17 May 2010 while that for neap tide was scheduled to commence in June 2010.

 

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 May 2010 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

Hourly Average Water Injection Rate

01/05/10-31/05/10

0

0

 

2

Stack NOx

01/05/10-31/05/10

N.A.

N.A.

 

Water

1

Cooling Water Temperature

01/05/10-31/05/10

N.A.

0

 

2

Cooling Water Temperature Rise

01/05/10-31/05/10

0

0

 

3

Total Residual Chlorine

01/05/10-31/05/10

0

0

 

4

Grease & Oil from Oil Free Drain

01/05/10-31/05/10

0

0

 

5

Temperature of Blowdown Effluent

01/05/10-31/05/10

N.A.

N.A.*

 

6

Suspended Solids from Blowdown Effluent

01/05/10-31/05/10

N.A.

N.A.*

 

7

Grease & Oil from Blowdown Effluent

01/05/10-31/05/10

N.A.

N.A.*

 

8

Inspection of Scum/Foam in ambient water

01/05/10-31/05/10

0

0

 

 

Note:      * Monitoring was not scheduled in the reporting month

 

4.3         Status of Environmental Licensing and Permitting

 

All permits/licenses obtained as of May 2010 are summarised in Table 4.2.

 

Table 4.2    Summary of Environmental Licensing and Permit Status

 

Description

Permit / Licence No.

Valid Period

Status

From

To

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

WT00005923-2010

29/01/2010

30/11/2011

Valid

 

 

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 May 2010, no complaint against the Project was received.

 

Table 4.4      Environmental Complaints / Enquiries Received in May 2010

 

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         Outage Plan for the coming 3 months

 

No major outage plan for the next 3 months.

 

5.2         Key issues for the coming month

 

Key issues to be considered in the coming month include:

 

Air Impact

·         To monitor the water injection rate continuously.

·          To monitor the NOx emission continuously through the newly installed GT57 CEM System.    

·         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).

·          To carry out the thermal plume survey for GT57 for neap tide in June 2010.

 

 

 

6.             CONCLUSION

 

Environmental monitoring was performed as required in the reporting month. All monitoring results were checked and reviewed.

 

No Action/Limit level exceedance on water injection rate was recorded in the reporting month.

 

No Action/Limit level exceedance on water quality parameters were recorded in the reporting month. 

 

Environmental mitigation measures recommended in the Project Profile were implemented in the reporting month.  No complaint against the Project 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.

 

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.

Total Residual Chlorine

Bi-weekly, when the combined cycle unit is operating

0.5mg/L

0.47

0.5

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 (May 2010)

 

Date

Maximum Outlet Temperature (Deg. Celsius)

Maximum Outlet Temperature Rise

(Deg. Celsius)

1/5/2010

27.6

5.5

2/5/2010

28.0

5.3

3/5/2010

28.0

5.8

4/5/2010

28.6

5.6

5/5/2010

29.5

6.8

6/5/2010

30.3

6.9

7/5/2010

30.3

6.5

8/5/2010

31.2

6.4

9/5/2010

31.0

6.7

10/5/2010

30.3

6.4

11/5/2010

30.7

6.9

12/5/2010

30.7

6.8

13/5/2010

30.8

6.8

14/5/2010

30.9

7.0

15/5/2010

30.0

5.8

16/5/2010

29.6

5.0

17/5/2010

31.1

6.4

18/5/2010

31.8

7.2

19/5/2010

32.5

7.4

20/5/2010

32.8

7.1

21/5/2010

33.6

7.0

22/5/2010

33.7

7.3

23/5/2010

31.8

5.4

24/5/2010

*

*

25/5/2010

*

*

26/5/2010

*

*

27/5/2010

*

*

28/5/2010

*

*

29/5/2010

*

*

30/5/2010

*

*

31/5/2010

*

*

Note:    * GT57 was not on load.

 

 

Total Residual Chlorine Level at C.W. Outfall No.1 (May 2010)

 

Date of sampling

06/05

20/05

Total Residual Chlorine, mg/L

0.25

0.25

 

Grease & Oil at Oil Free Drain From Oil Interceptor for GT57 (May 2010)

 

Date of sampling

31/05

Grease & Oil, mg/L

<10

 

Boiler Blowdown from GT5 & GT7 HRSG to C.W. Outfall No.1 (May 2010)

 

Source of discharge

GT5

GT7

Suspended Solid, mg/L

#

#

Grease & Oil, mg/L

#

#

Temperature, Deg. Celsius

#

#

Note:    # Monitoring was not scheduled in the reporting month. The last monitoring was carried out in March 2010.

 

 

Observation of Scum Formation in Marine Water Mixing Zone

At Lamma Power Station (May 2010)

 

Date

Observation

1/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

2/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

3/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

4/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

5/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

6/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

7/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

8/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

9/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

10/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

11/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

12/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

13/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

14/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

15/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

16/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

17/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

18/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

19/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

20/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

21/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

22/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

23/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

24/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

25/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

26/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

27/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

28/5/2010

No scum within 500m of HSY Beach, NW/SW corner of the Station & CW Outfall

29/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

30/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

31/5/2010

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and defoamer added to Outfalls No.1 & No.2

Note:    The water spraying system at C.W. Outfall was in service in the reporting month.