COVER
TABLE OF
CONTENTS
EXECUTIVE
SUMMARY
1. Introduction.. 1
1.1 Purpose
of the Report. 1
1.2 Background of
the Project. 1
1.3 Structure
of the Baseline Monitoring Report. 2
2. Air Quality.. 6
3. Noise.. 8
4. Water Quality.. 10
5. Conclusion.. 11
Executive
Summary
This is an environmental
baseline monitoring report for the operational phase of the Lamma Power Station Extension (the Project). This report contains the
background information of the Project. Similar environmental monitoring work would
be conducted to meet the requirements set out in the Licenses issued under the
Air Pollution Control Ordinance (APCO) and the Water Pollution Control
Ordinance (WPCO).
The Action and Limit Levels for stack NOx would be established from
the NOx emission limit stated in section 3(b) of EPD’s guideline “A
Guidance Note on the Best Practicable Means for Electricity Works”.
Continuous noise monitoring would be carried out for the EM&A
(Operational Phase) of the Project. The monthly average Leq's measured from
January 2004 to December 2004 at the existing Ash
Lagoon noise monitoring station (which will be the monitoring station for
the operational phase) were regarded as the baseline
noise levels for the EM&A (Operational Phase).
Effluent discharges from the Project would be covered
in the WPCO Licence. The action/limit levels would be
established from the limit levels/criteria to be stipulated in the WPCO Licence.
1.
Introduction
As per Condition 6.11 of the Environmental Permit
(EP-071/2000/C) for the Environmental Monitoring and Audit (Operational Phase)
for Lamma Power Station Extension (the Project), HEC is required to submit the
Baseline Monitoring Report to EPD.
The primary purpose of the baseline
monitoring prior to the commencement of the Project is to form the basis for
establishing the criteria (viz. A/L Levels) for the impact monitoring.
However, unlike
the EM&A programme for the construction project, baseline monitoring for
the Project during the operational phase is not required to measure monitoring
parameters of air and water quality at the sensitive receivers during a
representative pre-project period.
Similar environmental monitoring work would be conducted to meet the
requirements set out in the Licences issued under the APCO and the WPCO. The purpose of the baseline monitoring
report is to provide background information of the Project and the baseline data
for noise.
1.2
Background
of the Project
The Project involves the construction and
operation of a gas-fired power station employing combined cycled gas turbine
technology, forming an extension to the existing Lamma Power Station. The following outlines the key elements
of the Project including the new power station and its associated transmission
system and submarine gas pipeline.
(a) The
New Power Station
Combined Cycle Plant
Six 300 MW class gas-fired combined cycle units will be constructed
on the Lamma Extension. Each unit
will consist of a gas turbine, a heat recovery steam generator (HRSG), a steam
turbine, a generator and a flue gas stack of about 110 m.
Gas Receiving Station
To receive natural gas delivered from a
regional LNG receiving terminal through a pipeline, a gas receiving station
will be required. Received natural
gas will be processed in the receiving station and subsequently delivered to
the plant for combustion. Major
components of the station include shut-off valves, pig receiver, filter, gas
heaters, pressure regulator, metering device, stack and protection system to
ensure safe operation.
The Project area for the operation of new
power station is shown in Figure 1.1.
(b) Transmission
System
The electricity generated from the Lamma
Extension Project will be transmitted via a new transmission system linking the
Lamma Extension to load centres on Hong Kong Island as shown in Figure
1.2.
(c) Gas
Pipeline
Natural gas for the new power station will
be supplied via a submarine pipeline from a regional LNG receiving terminal
located at Cheng Tou Jiao in Shenzhen as shown in Figure 1.3.
The Environmental Impact Assessment (EIA)
Report for the Project, which was prepared in response to the EIA Study Brief
No. ESB-001/1998 issued to Hongkong Electric Company Limited (HEC) by the
Environmental Protection Department (EPD), was completed in February 1999. The EIA Report was submitted to the
Director of Environmental Protection (DEP) in accordance with the Environmental
Impact Assessment Ordinance (EIAO) on 23 December 1998 and was approved by DEP
on 5 May 1999.
The application for Environmental Permit
(EP) was submitted to EPD on 10 July 2000. The Environmental Permit (EP-071/2000) was granted on 8
August 2000. The subsequent
applications and approvals of the variation of Environmental Permit are summarised
in the following table:
|
Environmental Permit
|
Application
|
Purpose of Variation
|
Approved by EPD
|
|
Environmental
Permit (EP-071/2000/A)
|
25 November 2000
|
Shortening
of various notification periods.
|
22 December 2000
|
|
Environmental
Permit (EP-071/2000/B)
|
20 June 2001
|
Addition
of dredging scenarios for reclamation work.
|
13 July 2001
|
|
Environmental
Permit (EP-071/2000/C)
|
23 April 2005
|
Change
of dredging and jetting rates for gas pipeline construction work, and change
of the time period for which the pipeline jetting work is not allowed.
|
18 May 2005
|
The
structure of the report is as follows:
Section 1: Introduction – detailing the
purpose and structure of the report.
Section 2: Air Quality – presenting
the
zero baseline emission result.
Section 3: Noise – presenting
the baseline
noise data.
Section
4: Water Quality –
presenting
the
zero baseline emission result.
Section 5: Conclusion
Figure 1.1 Layout of Lamma Power Station Extension
Figure 1.2
Layout of
Transmission System
Figure 1.3
Layout of Gas
Pipeline
2.
Air Quality
The environmental monitoring
requirement of air pollutants emissions from new gas-fired units will be
stipulated in a Specified Processes Licence
issued under APCO. The Licence will specify the emission limits in terms of concentrations
and emission rates.
At the time of writing this
baseline monitoring report, the plant is still under construction and no
environmental monitoring data related to air pollutant emission is
available. Hence, a “zero”
emission baseline can be assumed for air quality monitoring. Furthermore,
no information regarding the licence emission limit is available, the
action/limit levels would be established from the NOx emission limit stated in
section 3(b) of EPD’s guideline “A Guidance Note on the Best Practicable Means
for Electricity Works”.
3.
Noise
Continuous noise monitoring at a strategic
location (viz. the monitoring station at Ash Lagoon) for the critical noise sensitive receiver (NSR) at Hung Shing Ye would be carried out for the EM&A (Operational Phase) of the Project. Baseline noise levels are
required for applying correction
to the impact noise monitoring data at the monitoring station. The location
of the existing Ash Lagoon noise monitoring station is shown in Figure 3.1.
As the major noisy dredging and site formation
works had been completed before 2004, the monthly
average Leq's measured at the existing Ash Lagoon noise
monitoring station from January 2004 to December 2004 can be taken
as the baseline noise levels for the EM&A
(Operational Phase)
of the Project.
The noise
measurements at Ash Lagoon were made
in accordance with standard acoustical principles and practices in relation to
weather conditions. The sound level meters used shall
comply with
International Electrotechnical Commission Publications 651:1979 (Type 1) and
804:1985 (Type 1).
Baseline Data in Monthly Average Noise Level at the Ash Lagoon Noise Monitoring Station are as follows:
|
Month
|
Monthly Average Leq Noise Level
(dB(A))
|
|
07:00-23:00
|
23:00-07:00
of next day
|
|
January 2004
|
62.7
|
56.8
|
|
February 2004
|
63.2
|
55.9
|
|
March 2004
|
62.5
|
55.6
|
|
April 2004
|
63.4
|
55.7
|
|
May 2004
|
62.1
|
55.4
|
|
June 2004
|
60.8
|
55.3
|
|
July 2004
|
60.7
|
55.1
|
|
August
2004
|
60.1
|
55.8
|
|
September
2004
|
60.8
|
56.2
|
|
October
2004
|
61.0
|
56.1
|
|
November
2004
|
61.1
|
56.1
|
|
December 2004
|
61.4
|
56.2
|
Figure 3.1 Location
of the Existing Ash Lagoon Noise Monitoring Station
4.
Water Quality
Effluent
discharges from the Project would be covered in the WPCO. At the time of writing the baseline
monitoring report, the plant is still under construction and no environmental
monitoring data related to effluent is available. Hence, a “zero” emission baseline can be assumed for water
quality monitoring. The action/limit levels would be established from the
limit levels/criteria to be stipulated in the WPCO Licence.
5.
Conclusion
Similar
environmental monitoring work would be implemented in the
future to meet the requirements set out in the Licences issued under the APCO or the WPCO.
The Action and
Limit Levels for stack NOx would be established from the NOx emission
limit stated in section 3(b) of EPD’s guideline “A Guidance Note on the Best
Practicable Means for Electricity Works”.
Continuous noise monitoring would be carried out for the EM&A
(Operational Phase) of the Project. The monthly average Leq's measured from
January 2004 to December 2004 at the existing Ash
Lagoon noise monitoring station (which will be the monitoring station for
the operational phase) were regarded as the baseline
noise levels for the EM&A (Operational Phase).
Effluent
discharges from the Project would be covered in the WPCO. The
action/limit levels would be established from the limit levels/criteria to be
stipulated in the WPCO Licence.