Introduction
1.
This Impact Environmental
Monitoring and Audit (EM&A) Report is prepared by Cinotech Consultants
Limited (ET-Cinotech) for the post-trenching works for the project “Lamma
Project Station Extension – Supply and Installation of Submarine Gas Pipeline”
(the Project). The post-trenching works
were commenced on 4th June 2005.
2.
This report
presents the impact environmental monitoring works performed at the sensitive
receivers including Ping Chau, southern Po Toi and Lamma between 4th and 30th
June 2005.
Environmental Monitoring Works
3.
Environmental
monitoring for the Project was performed as stipulated in the Work Procedure
and the results were checked and reviewed.
Water
Quality
4.
Post-trenching
activities were carried out at Po Toi and south Lamma sensitive areas in the reporting
month. Water quality monitoring was performed based on the progress of the
post-trenching machine in accordance with the work procedure. The monitoring was conducted on 17th
and 28th June 2005 at Po Toi sensitive area and 22nd and 25th
June 2005 at south Lamma
sensitive area in the reporting month.
5.
There was no
exceedance for all the parameters. No
major pollution sources were identified during the monitoring. Summary of the non-compliance of the
monitoring events is tabulated Table I.
Table I Summary Table for Non-compliance Recorded
|
Media /
Nature
|
No. of Exceedances
|
Action Taken
|
Results of action taken
|
Remarks
|
|
Action Level
|
Limit Level
|
|
DO
|
0
|
0
|
N.A.
|
N.A.
|
-
|
|
Turbidity
|
0
|
0
|
|
SS
|
0
|
0
|
6.
In
accordance with the work procedure, initial water quality monitoring was also
performed for pipeline alignment away from sensitive receivers in the reporting month. The details of the methodology, locations and results of the
initial monitoring were presented in a separate report, “Initial Water Quality
Monitoring for Post-Trenching Works Interim Report”.
Complaints and Prosecutions
7.
No environmental
complaint and prosecution were received during the reporting month.
Future Key Issues
8.
Post-trenching
will be the major activities in the coming month. The
anticipated environmental impact will be mainly on water quality.
1.1
Hong Kong
Electric Holdings Ltd. (HEC) intends to develop a 1,800 MW power station in
Hong Kong Special Administrative Region (HKSAR) to meet the forecast increase
in electricity demand to cope with the social and economical growth of the
HKSAR. The proposed power station will be located at reclaimed land in the
south of the existing Lamma Power Station at the western edge of Lamma Island, termed Lamma Power Station Extension.
1.2
The proposed
Power Station will use natural gas as fuel to generate electricity. The natural
gas will be supplied from Guandong Liquefied Natural Gas (GD LNG) Terminal
located at Cheng Tou Jiao of Shenzen PRC via a 20 inches diameter gas submarine
pipeline.
1.3
HEC awarded
Saipem Asia Sdn. Bhd. (hereafter called “the Contractor) for the design,
engineering, supply of materials, fabrication, testing at works, delivery to
site, complete erection including pre-trenching, pipe laying, rock dumping,
testing and pre-commissioning at site, preservation during the Defects
Liability Period of Submarine Gas Pipeline under to Project titled “Lamma Power
Station Extension – Supply and Installation of Submarine Gas Pipeline”
(hereinafter called “the Project”). Cinotech Consultants Limited was
subsequently commissioned by the Contractor as the Environmental Team
(ET-Cinotech) to provide environmental consultancy services and to undertake
the Environmental Monitoring and Audit (EM&A) works for the Project.
1.4
The Project
works include Pre-Trenching works, Pipe-Lay installation, Post-Lay Trenching
(Jetting) and Rock Dumping works related to the installation of 92 km of 20
inches diameter Submarine Gas Pipeline between Guandong Liquefied Natural Gas
Terminal (GD LNG) and the receiving point at Gas Receiving Station (GRS) at
South-West of Lamma Extension on Lamma Island of Hong Kong – SAR. An
Environmental Permit (EP) has been issued for the Lamma Power Station Extension
project. Variations to the EP
requirements have been proposed recently for the Project works and the VEP no.
EP-071/2000/C was issued on 18th May 2005.
1.5
In accordance
with the requirements of the EM&A Manual, water quality monitoring should
be carried out for the jetting operations
for the first two weeks of the construction programme. Further monitoring after
the initial two weeks should be carried out if unacceptable impacts are
revealed. In addition, monitoring should
be carried out at Ping Chau, southern Po Toi and southern Lamma when jetting
operation is conducted in the vicinity of these ecological sensitive areas
identified in the EIA report. The original water quality monitoring programme
stipulated in the EM&A Manual has been reviewed and updated to cater for
the proposed variations of the EP requirements.
The updates include a 3-day intensive water quality programme, which
supersedes the original two-week programme. Baseline and impact monitoring will also be
undertaken at the said three sensitive zones defined in the EIA report.
1.6
A Work Procedure
outlining the monitoring and audit programme to be undertaken for the post-trenching
works was submitted. The baseline water quality monitoring was
conducted at the three sensitive zones prior to the commencement of the
post-trenching works. The post-trenching
works were commenced on 4th June 2005.
1.7
In accordance with the work procedure, water quality monitoring should
be undertaken at mid-flood and mid-ebb tides when the jetting activities are
carried out at the three sensitive areas, Ping Chau, southern Po Toi and south
Lamma identified in the EIA report. Water quality monitoring based on the progress of the
post-trenching machine was performed in the reporting month. This report presents the
monitoring locations, equipment, period, methodology, results and observations
for the water quality measurements in June 2005.
1.8
Different
parties with different levels of involvement in the project organization
include:
· Project Proponent –Hong Kong Electric Holdings Ltd.
(HEC)
· Contractor – Saipem Asia Sdn. Bhd.
· Environmental Team (ET-Cinotech) – Cinotech
Consultants Limited
1.9
The
responsibilities of respective parties are detailed in Section 3 of the EM&A
Requirements Review (Review) and the project organization chart is presented in
Figure 3.1 of the Review. The key contacts of the ET- Cinotech are shown in
Table 1.1.
Table 1.1 Key Project Contacts
|
Party
|
Name
|
Role
|
Phone No.
|
Fax No.
|
|
ET-Cinotech
|
Dr. Priscilla Choy
|
Project Manager
|
2151 2089
|
3107 1388
|
|
Ms. Winniss Kong
|
Coordinator
|
2151 2068
|
3107 1388
|
|
Mr. Henry Leung
|
Monitoring Team Leader
|
2151 2087
|
3107 1388
|
2.1
During the course of the post-trenching works, monitoring should be
undertaken at mid-flood and mid-ebb tides, when the post-trenching activities
are carried out at the three sensitive areas, Ping Chau, southern Po Toi and
Lamma as identified in the EIA report.
2.2
In accordance
with the work procedure, initial water quality monitoring was required. The
initial water quality monitoring was performed in the reporting month. The details of the
methodology, locations and results of the initial monitoring were presented in
a separate report, “Initial Water Quality Monitoring for Post-Trenching Works
Interim Report”.
2.3
The following water quality parameters were included in the monitoring
programme.
Table 2.1 Water Quality
Monitoring Parameters
|
Phase
|
Water Quality Parameters
|
|
Construction
|
· Salinity (ppt)
· Turbidity (NTU)
· Dissolved oxygen (DO) (mg/L and % of saturation)
· Suspended solids (SS) (mg/L)
|
2.4
The water samplers used for water quality monitoring were Kahlsico
Water-Bottle Model 135DW150. The
samplers with associated equipment complied with the specifications stipulated
in the work procedure.
2.5
Table 2.2 summarizes the equipment used in the water quality monitoring
program. All the monitoring equipment
complied with the specifications stipulated in the work procedure. Copies of the calibration certificates of are
attached in Appendix A.
Table 2.2 Water Quality Monitoring Equipment
|
Equipment
|
Model and Make
|
Qty.
|
|
Water Sampler
|
Kahlsico Water-Bottle Model 135DW 150
|
2
|
|
Multi-parameter Water Quality System
|
YSI 6820
|
2
|
2.6
A total of fourteen water quality monitoring locations were selected at
the three sensitive areas. Table 2.3
describes the locations of these monitoring stations. The locations of the control and impact monitoring
stations are shown in Figures 2.1 and
2.2.
Table 2.3 Locations of Water Quality Monitoring Stations
|
ID
|
Location / Corresponding Sensitive Area
|
Type of Monitoring Station
|
Co-ordinates
|
|
|
|
|
L-C1
|
Lamma Island
|
Control Station
|
|
|
|
L-C2
|
Control Station
|
|
|
|
L-I1
|
Impact Station
|
|
|
|
L-I2
|
Impact Station
|
|
|
|
PT-C1
|
Po Toi
|
Control Station
|
|
|
|
PT-C2
|
Control Station
|
|
|
|
PT-I1
|
Impact Station
|
|
|
|
PT-I2
|
Impact Station
|
|
|
|
PT-I3
|
Impact Station
|
|
|
|
PC-C1
|
Ping Chau
|
Control Station
|
|
|
|
PC-C2
|
Control Station
|
|
|
|
PC-I1
|
Impact Station
|
|
|
|
PC-I2
|
Impact Station
|
|
|
|
PC-I3
|
Impact Station
|
|
|
2.7
Table 2.4 summarizes the monitoring period and frequencies of water
quality monitoring.
Table 2.4 Frequency and Parameters of Water Quality Monitoring
|
Station
|
Parameters
|
Frequency
|
No. of depth
|
|
L-C1, L-C2, L-I1, L-I2,
PT-C1, PT-C2, PT-I1, PT-I2, PT-I3, PC-C1, PC-C2, PC-I1, PC-I2, PC-I3
|
SS, turbidity, DO and
in-situ parameters*
|
At mid-ebb and mid-flood
tides when the post-trenching activities are carried out at the three
sensitive areas shown in Figures 2.1 and 2.2
|
3 (1m below water
surface, mid-depth and 1m above channel bed.)
|
Notes:
* In-situ parameters included temperature, salinity and DO
saturation.
Instrumentation
2.8
A multi-parameter meter (Model YSI 6820 CE-C-M-Y) was used to measure
DO, turbidity, salinity, and temperature.
Digital Global
Positioning Systems (DGPS) were used to ensure that the correction locations
were arrived prior to measurement and sample collection.
Operating/Analytical
Procedures
2.9
At each measurement, two consecutive measurements of in-situ parameters
were taken. The probes were retrieved
out of the water after the first measurement and then re-deployed for the
second measurement. Where the difference
in the value between the first and second readings of each set was more than
25% of the value of the first reading, the reading was discarded and further
readings were taken.
2.10
For SS measurement, grab samples were collected. Water samples of about 1,000 ml were
collected and stored in polyethylene bottles.
The sample bottles were packed into an ice-box and delivered to a HOKLAS
Laboratory, WELLAB Ltd., for the analysis within 24 hours.
Maintenance
and Calibration
2.11
Before each round of monitoring, a zero check in distilled water was
performed with the turbidity probe of YSI 6820.
The probe was kept in wet condition and then calibrated with a solution
of known NTU.
2.12
Verifications of
the DGPS were carried out at a known fixed reference point (survey nail
obtained from the Survey and Mapping office of Lands Department). The position was monitored over a period of 5
minutes. Deviations of smaller than
+/- 5 metres were demonstrated and recorded.
2.13
QA/QC procedures
for the suspended solids analyzed in the HOKLAS-accredited laboratory, Wellab
Limited are attached in Appendix C.
2.14
The monitoring
results and the graphical presentation are shown in Appendix C. Note that in Appendix C, the “sea condition”
is given as indicative information and does not necessarily adhere to any
standard sea state descriptions. In
general, “calm” means small or no waves were observed; “rough” includes
white-capped sea or rougher; and “moderate” means all conditions in between
“calm” and “rough”.
2.15
Post-trenching
activities were carried out at Po Toi and south Lamma sensitive areas in the reporting
month. Water quality monitoring was
conducted based on the progress of the post-trenching machine. The monitoring was performed on 17th
and 28th June 2005 at Po Toi sensitive area and 22nd and 25th
June 2005 at south
Lamma sensitive area.
2.16
No exceedance
for DO, turbidity and SS concentrations were recorded at the impact monitoring
stations at the two sensitive areas. The
monitoring data of the impact monitoring stations were also comparable to that
of the control stations. No major
pollution source was observed during the monitoring sessions.
3.1
The monitoring
works conducted by the monitoring team were inspected. The following observations have been recorded
for the monitoring works:
·
The monitoring team recorded all observations around
the monitoring stations, which might affect the monitoring result.
·
The monitoring team recorded the weather and sea
conditions on the monitoring day.
3.2
The Event Action
Plan for water quality is presented in Appendix E. No exceedance was recorded in the monitoring
event. No action was required.
3.3
The
implementation status of mitigation measures is summarized in Appendix G.
3.4
No
non-compliance was recorded during the site audits in the reporting month.
3.5
In accordance
with the work procedure, initial water quality monitoring was performed for
pipeline alignment away from sensitive receivers in the reporting month. The details of the
methodology, locations and results of the initial monitoring were presented in
a separate report, “Initial Water Quality Monitoring for Post-Trenching Works
Interim Report”.
3.6
No environmental
complaint and prosecution was received during the reporting month. The complaint log for the works is provided
in Appendix H.
4.1
Post-trenching
will be the major activities in the coming month and will be carried out at
Ping Chau sensitive area. The
anticipated environmental impact will be mainly on water quality.
4.2
The tentative environmental monitoring
schedule for the next month is shown in Appendix F.
5.1
Environmental monitoring works were performed on 17th and 28th
June 2005 at Po Toi
sensitive area and 22nd and 25th
June 2005 at south
Lamma sensitive area in accordance with the work procedure based on the progress of the
post-trenching machine. All monitoring results were checked and reviewed.
5.2
There was no
Action/Limit Level exceedance for all the water quality parameters. No major pollution sources were identified.
