COVER

 

Table of Content

 

EXECUTIVE SUMMARY

 

1.             INTRODUCTION.. 1

1.1       Plant Availability during the Reporting Month  1

1.2       Defect Rectification for Lamma Extension’s Associated Transmission System   1

1.3       Summary of EM&A Requirements  1

2.             AIR QUALITY.. 3

2.1       Monitoring Requirements  3

2.2       Summary of Results and Observations  3

3.             NOISE.. 4

3.1       Monitoring Requirements  4

3.2       Summary of Results and Observations  4

4.             WATER QUALITY.. 6

4.1       Monitoring Requirements  6

4.2       Summary of Results and Observations  6

4.3       Implementation Status on Thermal Plume and Residual Chlorine Surveys  7

5.             ENVIRONMENTAL AUDIT.. 8

5.1       Review of Environmental Monitoring Procedures  8

5.2       Assessment of Environmental Monitoring Results  8

5.3       Implementation Status of Environmental Mitigation Measures  9

5.4       Implementation Status of Event/Action Plans  9

5.5       Implementation Status of Environmental Complaint Handling Procedures  10

6.             FUTURE KEY ISSUES. 11

6.1       Outage Plan for the coming 3 months  11

6.2       Defect Rectification for Lamma Extension’s Associated Transmission System   11

6.3       Key issues for the coming month  11

7.             CONCLUSION.. 12

 

 

 

List of Tables

 

Table 2.1      Air Quality Monitoring Parameter and Frequency

Table 3.1      Noise Monitoring Parameter and Frequency

Table 4.1      Water Quality Monitoring Parameters and Frequencies

Table 5.1      Summary of Action/Limit Level Exceedances on Monitoring Parameters

Table 5.2      Environmental Complaints / Enquiries Received in July 2007

Table 5.3      Outstanding Environmental Complaints / Enquiries Carried Over

 

 

 

 

List of figure

 

Figure 3.1         Location of Noise Monitoring Station

 

 

AppendiX

 

Appendix A      Event/Action Plans

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

Appendix C      Air Quality Monitoring Results

Appendix D      Noise Monitoring Results

Appendix E      Summary Results and Observations on Water Quality Monitoring

Appendix F      Summary of EMIS

 

EXECUTIVE SUMMARY

 

This is the tenth monthly Environmental Monitoring and Audit (EM&A) report for the Project “Operation of Lamma Power Station Extension” prepared by the Environmental Team (ET).  This report presents the results of impact monitoring on air quality, noise, water quality and environmental audit for the operation of the said project in July 2007. 

 

Air quality, noise and water quality monitoring were performed. The results were checked against the established Action/Limit (AL) levels.  The implementation status of the environmental mitigation measures, Event/Action Plan and environmental complaint handling procedures were also checked.

 

 

Plant Availability

 

Unit L9 was out of service during the following period:

 

Period

Remark

21/07/07 21:02 to 22/07/07 02:34
Defect Rectification

 

 

Defect Rectification for Lamma Extension’s Associated Transmission System

 

A defect was recently discovered in one of the newly laid submarine cables from Pak Kok Tsui Landing Point (N5) to Cyberport Landing Point (I1).  It had been identified that the defective point of the cable was located at the offshore subsea area near Pak Kok Tsui Landing Point (N5).  Preparation work for further fault investigation was in progress.

 

 

Environmental Monitoring Works

 

Environmental monitoring works, as mentioned in the EM&A Manual (Operational phase), were performed during the operation of Lamma Power Station Extension in the reporting period. 

 

Air Quality

No exceedance of Action and Limit levels for stack NOx was recorded in the reporting month

 

Noise

No exceedance of Action and Limit levels for noise was recorded in the reporting month.

 

Water Quality

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

 

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 continuously monitor the stack NOx for Lamma Power Station Extension.

 

Noise Impact

·          To continuously monitor the noise for Lamma Power Station Extension.

 

Water Impact

·          To continuously carry out the water quality monitoring for Lamma Power Station Extension.

 

 

Concluding Remarks

 

The environmental performance of the project was generally satisfactory.

 

 

 

1.             INTRODUCTION

 

The operational phase Lamma Power Station Extension commenced in mid October 2006 following the completion of erection works and commissioning tests for Unit L9.  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 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 (Operational Phase) is required to be implemented.  In accordance with the EM&A Manual, environmental monitoring of air quality, noise and water quality are required for the Project.

 

This report summarizes the environmental monitoring and audit work for the Project for the month of July 2007.

 

 

1.1         Plant Availability during the Reporting Month

 

Unit L9 was out of service during the following period:

 

Period

Remark

21/07/07 21:02 to 22/07/07 02:34

Defect Rectification

 

 

1.2         Defect Rectification for Lamma Extension’s Associated Transmission System

 

A defect was recently discovered in one of the newly laid submarine cables from Pak Kok Tsui Landing Point (N5) to Cyberport Landing Point (I1).  It had been identified that the defective point of the cable was located at the offshore subsea area near Pak Kok Tsui Landing Point (N5).  Preparation work for further fault investigation was in progress.

 

 

1.3         Summary of EM&A Requirements

 

The EM&A program requires environmental monitoring for air quality, noise and water quality.  The EM&A monitoring work for air quality, noise and water quality are described in Sections 2, 3 and 4 respectively.

 

The following environmental audits are summarized in Section 5 of the report:

 

·        Environmental monitoring results;

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

 

The future key issues for the Project will be reported in Section 6 of this report.

 

 

 

2.             AIR QUALITY

 

 

2.1         Monitoring Requirements

 

In accordance with the EM&A Manual (Operational Phase) for Lamma Extension, stack NOx is continuously monitored.  Stack NOx monitoring data would be checked against the Action/Limit Levels stated in the EM&A Manual. The monitoring frequency is shown in Table 2.1 below:

 

Table 2.1    Air Quality Monitoring Parameter and Frequency

 

Parameter

Frequency

Hourly Average Stack NOx

Continuous

 

 

2.2         Summary of Results and Observations

 

Monitoring of stack NOx was conducted during the operation of Unit L9 in the reporting month.  A monthly summary of monitoring data is shown in Appendix C. 

 

No Action/Limit Level exceedance on stack NOx was recorded in the reporting month. 

 

 

3.             NOISE

 

3.1         Monitoring Requirements

 

In accordance with the EM&A Manual for Lamma Extension (Operational Phase), continuous noise monitoring at Ash Lagoon is carried out to calculate the noise arising from the operation of Lamma Extension at the critical NSR at Hung Shing Ye.  Baseline noise levels are applied for correction to the noise monitoring data.  The data after corrections would be checked against the Limit Levels specified in the EM&A Manual. 

 

The noise monitoring location is shown in Figure 3.1.  The monitoring parameter and frequency are shown in Table 3.1 below:

 

Table 3.1    Noise Monitoring Parameter and Frequency

 

Parameter

Frequency

Time Period

30-min LAeq

continuous

0700-2300 hrs and 2300-0700 hrs of next day

 

 

3.2         Summary of Results and Observations

 

Continuous noise monitoring was conducted at the monitoring station at Ash Lagoon.  The monitoring results are shown in Appendix D. 

 

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

 

 

Figure 3.1         Location of Noise Monitoring Station  


 

4.             WATER QUALITY

 

 

4.1         Monitoring Requirements

 

In accordance with the EM&A Manual for Lamma Extension (Operational Phase), 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 4.1 were monitored and checked against the Action/Limit Levels as given in Appendix B. 

 

Table 4.1    Water Quality Monitoring Parameters and Frequencies

 

Item

Parameters

Frequencies

1

Cooling Water Temperature Rise

Daily

2

Total Residual Chlorine

Bi-weekly

3

Temperature of Blowdown Effluent

At least twice per year

4

Suspended Solids from Blowdown Effluent

At least twice per year

5

Grease & Oil from Blowdown Effluent

At least twice per year

6

Scum of foam in ambient water

Daily

 

 

4.2         Summary of Results and Observations

 

Monitoring of various parameters as listed in Table 4.1 above were carried out during the operation of Unit L9 in the reporting month.  A monthly summary of the data is shown in Appendix E.

 

The data recorded for the monitoring parameters were all below their corresponding Action/Limit Levels.  No Action/Limit 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 E.  The effluent quality was generally satisfactory.

 

 

4.3         Implementation Status on Thermal Plume and Residual Chlorine Surveys

 

One survey for thermal plume and residual chlorine concentration at the seawater around the discharges from the Lamma Power Station and Lamma Power Station Extension shall be carried out after the commissioning of each of the generating units for the Project.  The first survey would be conducted in the summer of 2007 tentatively for the first gas-fired combined cycle Unit L9 after EPD’s agreement on the proposed technical requirements for the survey.

 

No survey was carried out in the reporting month. 

 

 

 

5.             ENVIRONMENTAL AUDIT

 

 

5.1         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.

 

 

5.2         Assessment of Environmental Monitoring Results

 

Monitoring results for Air Quality, Noise and Water Quality

 

The environmental monitoring results for air quality, noise and water quality in July 2007 presented in Sections 2, 3 and 4 respectively are summarized in Table 5.1.

 

Table 5.1    Summary of Action/Limit 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

Stack NOx

01/07/07-31/07/07

0

0

 

Noise

1

Noise levels at the critical NSR at Hung Shing Ye calculated by the noise alarm monitoring system

01/07/07-31/07/07

0

0

 

Water

1

Cooling Water Temperature Rise

01/07/07-31/07/07

0

0

 

2

Total Residual Chlorine

01/07/07-31/07/07

0

0

 

3

Temperature of Blowdown Effluent

01/07/07-31/07/07

N.A.

N.A.*

 

4

Suspended Solids from Blowdown Effluent

01/07/07-31/07/07

N.A.

N.A.*

 

5

Grease & Oil from Blowdown Effluent

01/07/07-31/07/07

N.A.

N.A.*

 

6

Inspection of Scum/Foam in ambient water

01/07/07-31/07/07

0

0

 

 

Note: * Monitoring was not scheduled in the reporting month

 

Land Contamination

 

There was no land contamination incident happened in the reporting month.

 

Waste Management

 

Waste management practice was properly implemented for operation of the project as outlined in the Waste Management Plan for Lamma Power Station Extension. There was no unacceptable environmental impact on waste management in the reporting month.

 

 

5.3         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 in Appendix F.

 

 

5.4         Implementation Status of Event/Action Plans

 

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

 

 

5.5         Implementation Status of Environmental Complaint Handling Procedures

 

In July 2007, no complaint against the Project was received.

 

Table 5.2      Environmental Complaints / Enquiries Received in July 2007

 

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /

Actions Taken

Conclusion /

Status

Nil

N/A

N/A

 

 

Table 5.3    Outstanding Environmental Complaints / Enquiries Carried Over

 

Case Reference /

Date, Time Received /

Date, Time Concerned

Descriptions /

Actions Taken

Conclusion /

Status

Nil

N/A

N/A

 

 

 

6.             FUTURE KEY ISSUES

 

6.1         Outage Plan for the coming 3 months

 

The major outage plan for the next 3 months is shown below:

 

Date

Remark

18/10/2007 to 21/10/2007

GT57 Pressure Reduction System Installation

 

 

6.2         Defect Rectification for Lamma Extension’s Associated Transmission System

 

The cable tail laid at seabed near Pak Kok Tsui Landing Point (N5) would be taken out and recoiled onto a working barge for fault investigation. 

 

Since the fault investigation would be carried out on a cable installation barge and subsequent repair work would be similar to the cable laying work, all requirements stipulated in the Environmental Permit for Lamma Power Station Extension (EP-071/2000/C) would be complied with.

 

 

6.3         Key issues for the coming month

 

Key issues to be considered in the coming month include:

 

Air Impact

 

·         To continuously monitor the stack NOx for Lamma Power Station Extension.

 

Noise Impact

 

·         To continuously monitor the noise for Lamma Power Station Extension.

 

Water Impact

 

·          To continuously carry out the water quality monitoring for Lamma Power Station Extension.

 

 

7.             CONCLUSION

 

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

 

No Action/Limit level exceedance on stack NOx was recorded in the reporting month

 

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

 

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

 

Environmental mitigation measures recommended in the EM&A Manual for the operational activities 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/Action Plan 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 Leader and advise ET Leader 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 Leader and advise ET Leader for any finding;

Verify the implementation of the remedial measures;

Discuss with ET Leader 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 inform IEC and 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 Leader and advise ET Leader of any finding;

Verify the implementation of the remedial measures.

 

Take immediate action to avoid further exceedances;

Discuss with ET Leader 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 inform IEC and 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 Leader/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 Leader on remedial actions required;

Implement the agreed remedial actions;

Check the suspected defective parts if the problem still does not come under control.

 

 

 

Table A.2         Event/Action Plan for Noise

 

Exceedance

ET Leader

IEC

Operations Engineer

Action Level

If the complaint against Lamma Extension operation is valid, identify the source(s) of the noise and propose remedial measures if necessary;

Verify the implementation of the remedial measures.

 

 

Discuss with ET Leader on remedial actions required;

 

Implement the agreed remedial actions.

Limit Level

Check monitoring data to confirm findings;

 

Identify the source(s) of the impact. If the exceedance is found to be valid and due to the Lamma Extension operation, verbally inform IEC and EPD of the exceedance as soon as practicable;

 

Discuss with Operations Engineers on remedial actions required.

Check monitoring data submitted by ET Leader and advise ET Leader of any finding;

 

Verify the implementation of the remedial measures.

Take action to avoid further exceedance;

 

Discuss with ET Leader on the remedial actions required;

 

Implement the agreed remedial actions.

 

 

 

 

 

Table A.3         Event/Action Plan for Water Quality

 

Exceedance

ET Leader

IEC

Operations Engineer

Action Level

 

Exceedance on one sampling day

Identify source(s) of impact;

Verbally inform IEC.

 

Check monitoring data submitted by ET Leader and advise ET Leader 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;

Discuss with Operations Engineers on remedial actions required;

Increase monitoring frequency;

If exceedance stops, discontinue additional monitoring.

 

Check monitoring data submitted by ET Leader and advise ET Leader for any finding;

Verify the implementation of the remedial measures.

Discuss with ET Leader on remedial actions required;

Implement the agreed remedial actions.

Limit Level

 

 

 

Exceedance on one sampling day

Identify the source(s) of impact;

Verbally inform IEC and EPD of the exceedance, as soon as practicable;

Repeat measurement to confirm finding;

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 Leader and advise ET Leader for any finding;

Verify the implementation of the remedial measures.

 

Take immediate action to avoid further exceedance;

Discuss with ET Leader on remedial actions required;

Implement the agreed remedial actions.

Exceedances on more than one consecutive sampling day

Identify the source(s) of impact;   Verbally inform IEC and EPD of the exceedance as soon as practicable;

Repeat measurement to confirm finding;

Discuss with Operations Engineers on remedial actions required;

Increase monitoring frequency;

Carry out analysis on existing control procedures to determine possible mitigation to be implemented;

If exceedance stops, discontinue additional monitoring.

 

Provide feedback and advise ET Leader/Operations Engineers on the effectiveness of the remedial actions proposed;

Verify the implementation of the remedial measures.

Take immediate action to avoid further exceedance;

Discuss with ET Leader on remedial actions required;

Implement the agreed remedial actions;

Check the suspected defective parts if the problem still does not come under control.

 

 

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

 

 

B.1      Air

 

Parameter

Frequency

Action

Limit

Hourly Average Stack NOx

Continuous

81 mg/Nm3

90 mg/Nm3

 

 

B.2.     Noise

 

Parameter

Frequency

Action

Limit

Noise Levels at the critical NSR at Hung Shing Ye calculated by the noise alarm monitoring system

Continuous

When more than one complaint is received within two weeks, which are concerning the same event or location

a.  60 dB(A) in LAeq,30 min (07:00-23:00 hrs)

b.  50 dB(A) in LAeq,30 min (23:00-07:00 hrs on next day)

 

 

B.3      Water

 

Monitoring Area / Location

Parameters to be Monitored

Frequency

Concentration Not to Be Exceeded

Action

Limit

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

9.5°C

+10°C above intake

Total Residual Chlorine

Bi-weekly, when the combined cycle unit is operating

0.5mg/L

0.47

0.5

Trade Effluent Boiler Blowdown

Temperature

At least twice per year, when the combined cycle unit is operating

40°C

-

40°C

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

 

Appendix C     Air Quality Monitoring Results

 

 

Site:       Lamma Power Station – Unit L9

 

Month:  July 2007

 

Monthly Summary of Stack NOx

  

Date

Daily Maximum Stack NOx concentration (mg/Nm3)#

1/7/2007

47

2/7/2007

48

3/7/2007

47

4/7/2007

47

5/7/2007

46

6/7/2007

45

7/7/2007

46

8/7/2007

47

9/7/2007

46

10/7/2007

45

11/7/2007

46

12/7/2007

45

13/7/2007

44

14/7/2007

46

15/7/2007

46

16/7/2007

46

17/7/2007

45

18/7/2007

44

19/7/2007

44

20/7/2007

44

21/7/2007

45

22/7/2007

47

23/7/2007

44

24/7/2007

44

25/7/2007

45

26/7/2007

44

27/7/2007

46

28/7/2007

46

29/7/2007

46

30/7/2007

44

31/7/2007

44

 

Note: # -    Hourly average value.  Expressed as at 0ºC, 101.325kPa, dry and corrected to 15% O2 condition.

 

 

 

Appendix D    Noise Monitoring Results

 

 

Site:                                    Lamma Power Station Extension

Measurement Location:       Ash Lagoon

Measurement Parameter:    30-min Leq (07:00-23:00 hrs and 23:00-07:00 hrs on next day)

 

 

Date

Time

Calculated Noise Level at

NSR at Hung Shing Ye

(dB(A))

Limit Noise Level

(dB(A))

Max

Avg

01/07/2007

07:00-23:00

---

---

60

01/07/2007

23:00-07:00

27

25

50

02/07/2007

07:00-23:00

34

31

60

02/07/2007

23:00-07:00

39

34

50

03/07/2007

07:00-23:00

---

---

60

03/07/2007

23:00-07:00

28

27

50

04/07/2007

07:00-23:00

37

35

60

04/07/2007

23:00-07:00

8

8

50

05/07/2007

07:00-23:00

---

---

60

05/07/2007

23:00-07:00

26

23

50

06/07/2007

07:00-23:00

35

33

60

06/07/2007

23:00-07:00

27

25

50

07/07/2007

07:00-23:00

---

---

60

07/07/2007

23:00-07:00

---

---

50

08/07/2007

07:00-23:00

---

---

60

08/07/2007

23:00-07:00

39

37

50

09/07/2007

07:00-23:00

---

---

60

09/07/2007

23:00-07:00

35

35

50

10/07/2007

07:00-23:00

28

25

60

10/07/2007

23:00-07:00

---

---

50

11/07/2007

07:00-23:00

---

---

60

11/07/2007

23:00-07:00

27

24

50

12/07/2007

07:00-23:00

35

33

60

12/07/2007

23:00-07:00

31

26

50

13/07/2007

07:00-23:00

---

---

60

13/07/2007

23:00-07:00

---

---

50

14/07/2007

07:00-23:00

---

---

60

14/07/2007

23:00-07:00

25

23

50

15/07/2007

07:00-23:00

31

31

60

15/07/2007

23:00-07:00

27

25

50

16/07/2007

07:00-23:00

35

32

60

16/07/2007

23:00-07:00

---

---

50

17/07/2007

07:00-23:00

42

40

60

17/07/2007

23:00-07:00

22

22

50

18/07/2007

07:00-23:00

41

37

60

18/07/2007

23:00-07:00

28

27

50

19/07/2007

07:00-23:00

36

33

60

19/07/2007

23:00-07:00

33

26

50

20/07/2007

07:00-23:00

42

38

60

20/07/2007

23:00-07:00

28

24

50

21/07/2007

07:00-23:00

40

37

60

21/07/2007

23:00-07:00

35

30

50

22/07/2007

07:00-23:00

---

---

60

22/07/2007

23:00-07:00

32

27

50

23/07/2007

07:00-23:00

---

---

60

23/07/2007

23:00-07:00

28

23

50

24/07/2007

07:00-23:00

39

34

60

24/07/2007

23:00-07:00

33

29

50

25/07/2007

07:00-23:00

39

34

60

25/07/2007

23:00-07:00

35

31

50

26/07/2007

07:00-23:00

44

40

60

26/07/2007

23:00-07:00

33

29

50

27/07/2007

07:00-23:00

45

41

60

27/07/2007

23:00-07:00

33

29

50

28/07/2007

07:00-23:00

35

31

60

28/07/2007

23:00-07:00

31

29

50

29/07/2007

07:00-23:00

---

---

60

29/07/2007

23:00-07:00

34

30

50

30/07/2007

07:00-23:00

38

36

60

30/07/2007

23:00-07:00

34

29

50

31/07/2007

07:00-23:00

---

---

60

31/07/2007

23:00-07:00

32

27

50

 

Note:    “--- “ represents the measured noise monitoring data lower than the established notional background level/discarded under strong wind.

Appendix E     Summary Results and Observations on Water Quality Monitoring

 

Maximum Outlet Temperature Rise (Deg. Celsius) of Cooling Water at C.W. Outfall No.3 Serving L9 Condensers

 

Weighted by Flowrates of Individual Streams (July 2007)

 

Date

Maximum Outlet Temperature Rise

(Deg. Celsius)

01/07/2007

8.2

02/07/2007

8.6

03/07/2007

8.4

04/07/2007

8.3

05/07/2007

8.3

06/07/2007

8.4

07/07/2007

8.4

08/07/2007

8.2

09/07/2007

8.6

10/07/2007

8.6

11/07/2007

8.4

12/07/2007

8.4

13/07/2007

8.4

14/07/2007

8.4

15/07/2007

8.2

16/07/2007

8.6

17/07/2007

8.4

18/07/2007

8.4

19/07/2007

8.4

20/07/2007

8.4

21/07/2007

8.6

22/07/2007

8.5

23/07/2007

8.5

24/07/2007

8.5

25/07/2007

8.4

26/07/2007

8.4

27/07/2007

8.5

28/07/2007

8.9

29/07/2007

8.4

30/07/2007

8.4

31/07/2007

8.4

 

Total Residual Chlorine Level at C.W. Outfall No. 3 (July 2007)

 

Date of sampling

05/07/2007

20/07/2007

Total Residual Chlorine, mg/L

0.42

0.44

 

 

Blowdown from Unit L9 Steam Turbine and HRSG to C.W. Outfall No. 3 (July 2007)

 

Source of Discharge

HSRG

Steam Turbine

Suspended Solid, mg/L

#

#

Grease & Oil, mg/L

#

#

Temperature, Deg. Celsius

#

#

 

 

Observation of Scum Formation in Marine Waters Mixing Zone at Lamma Power Station Extension (July 2007)

 

Date

Observation

01/07/2007

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

02/07/2007

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

03/07/2007

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

04/07/2007

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

05/07/2007

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

06/07/2007

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

07/07/2007

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

08/07/2007

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

09/07/2007

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

10/07/2007

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

11/07/2007

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

12/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

13/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

14/07/2007

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

15/07/2007

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

16/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

17/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

18/07/2007

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

19/07/2007

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

20/07/2007

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

21/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

22/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

23/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

24/07/2007

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

25/07/2007

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

26/07/2007

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

27/07/2007

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

28/07/2007

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

29/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

30/07/2007

No scum within 500m of HSY Beach & NW/SW corner of the Station; Some foam outside CW Outfall and dispersed by ferry

31/07/2007

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

 

Note:

 

 

1.   # Monitoring was not scheduled in the reporting month.

2.   The water spraying pump of foam suppression system at C.W. Outfall was in service in the reporting month.

Appendix F     Summary of EMIS

 

EM&A Log Ref.

Mitigation Measures

Implementation Status

 

Air Quality

 

A1

Implement the gas-fired units as base-load units.  For the existing power station, the more efficient units incorporating FGD and low NOx systems shall be operated first under normal situation to meet system demand.  In case of any deviations from this, EPD shall be notified of the details and circumstances for the deviation.

Complied

A2

HEC shall undertake annual revisions and update of its GHG emissions inventory, which covers all HEC existing facilities and new extension, for at least the six GHGs specified under the Kyoto Protocol (CO2, CH4, N2O, HFCs, PFCs and SF6).  The inventory shall be established and maintained in accordance with the latest IPCC Guidelines or any other guidelines issued by Government, with details documented for regular reviews and updates. The inventory shall be reported on an annual basis, including actual figures and targets for the previous and current years, as well as the next year's forecast.  Discrepancies for actual versus target figures and actions for improvement or enhancement shall be discussed.  HEC shall update the inventory according to the figures of the electricity load forecast, upon every subsequent review by the Government.  This shall also be reported in the annual report. 

 

(The annual report of GHG emissions inventory shall be deposited with the Director of Environmental Protection within three months after the end of the reporting period.)

Complied

 

 

 

 

Water Quality

 

B1

No further mitigation measures were found to be necessary provided the discharge of cooling water and residual chlorine are kept below the rates assumed in the water quality assessment*.

 

*All discharges of effluent/wastewater shall be controlled through licensing under the Technical Memorandum for Effluents Discharged into Drainage and Sewerage Systems. Inland and Coastal Waters, issued under Section 21 of the Water Pollution Control Ordinance.

Complied

 

 

 

 

Noise

 

C1

HEC shall implement the gas-fired units for based-load operation to minimize the noise generated from the existing units.

Complied

 

 

 

 

Landscape & Visual impacts

 

D1

No mitigation measures were considered necessary.

N/A

 

 

 

 

EM&A Log Ref.

Mitigation Measures

Implementation Status

 

LAND CONTAMINATION AND WASTE MANAGEMENT

 

E1

HEC shall maintain records of the following items:

 

-         integrity testing of light oil tanks*;

-         daily inspection of the light oil tanks and bunded areas*;

-         quantities of oily waste and sludge generated from oil interceptors and chemical waste generated from operation of the power station;

-         deposal oil oily waste/sludge and chemical waste to licenced site;

-         quantities of chemical and chemical waste;

-         incident of spillage and remediation actions; and

-         emergency response training and drills.

 

* As the Light Gas Oil (LGO) for Lamma Extension is supplied from the existing LGO storage tanks located at Lamma Power Station, there is no LGO storage tank at Lamma Extension.

 

Complied

 

Marine Ecology

 

F1

No mitigation measures were considered necessary.

N/A

 

 

 

 

 

fisheries

 

G1

No mitigation measures were considered necessary.

N/A

 

 

 

 

 

RISK ASSESSMENT

 

H1

No mitigation measures were considered necessary.

N/A