Introduction
1.
This is
the second Environmental Monitoring and Audit (EM&A) Report prepared by
Cinotech Consultants Limited (ET-Cinotech) for the dredging works at the Lamma
Shore Approach (approximately 0.7km) for the project “Lamma Project Station
Extension – Supply and Installation of Submarine Gas Pipeline” (the
Project). This document reported the
findings of EM&A Works conducted in March 2005.
Environmental
Monitoring Works
2.
Environmental
monitoring for the Project was performed as stipulated in the Work Procedure
and the results were checked and reviewed.
3.
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
|
Water Quality
4.
Water
quality monitoring was conducted as scheduled for 3 days a week in the first stage,
i.e., within the first two weeks of the dredging works at Lamma Approach. As the monitoring results in the first stage
were found to be acceptable (no exceedance of water quality related to the
Project), the frequency of the monitoring was reduced to 1 day within the third
and fourth weeks of the dredging works, i.e., the second stage. Since the monitoring results obtained in
second stage are found to be acceptable, further monitoring was not necessary.
5.
There
was no exceedance for all the parameters.
No major pollution sources were identified during the monitoring.
Complaints and Prosecutions
6.
No
environmental complaint and prosecution were received during the reporting
month.
Future Key Issues
7.
The
dredging works were completed on 13th March 2005. No key
environmental issue was identified for the coming month.
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.
1.5
In particular,
trench dredging works are carried out at the Lamma Shore Approach
(approximately 0.7 km) for a period of about 45 days and the location is also
shown in Figure 1. According Item 4.5 of
the “Response to Tenderers’ Query No.2”, a minimum of ten (10) water quality
monitoring stations for the dredging works at Lamma shore approach.
1.6
A
Work Procedure outlining the monitoring and audit programme to be undertaken
for the pre-trenching (dredging) works for the Lamma Shore Approach was submitted and approved. The dredging works and the corresponding
monitoring works in accordance with the Work Procedure were commenced on 22nd
February 2005. The dredging works were completed on 13th March 2005
whist the monitoring works were finished on 15th March 2005.
1.7
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
1.8
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 of ET
|
2151 2089
|
3107 1388
|
|
Ms. Winniss Kong
|
Coordinator
|
2151 2068
|
3107 1388
|
|
Mr. Henry Leung
|
Monitoring Team Leader
|
2151 2087
|
3107 1388
|
1.9
The
dredging works for Lamma Shore Approach were commenced on 22nd
February 2005 and were completed on 13th March 2005.
1.10 The EM&A programme requires water
quality during the dredging works of the Lamma Shore Approach. Full scale water quality monitoring will be
carried out within the first two weeks of the construction programme. The frequency of the monitoring after the
initial two weeks will then be reduced if no acceptable impact is revealed.
1.11 The EM&A requirements are described in
following sections, including:
· All monitoring parameters;
· Statutory limits for all environmental
parameters;
· Event / Action Plan.
1.12 This report presents the monitoring
results, observations, locations, equipment, period, methodology and QA/QC
procedures of the required monitoring parameters, namely water quality for the
dredging works of the Lamma Shore Approach.
2.1
In
order to ensure that any deterioration in water quality can be readily detected
and timely action taken to rectify the situation, a water quality monitoring
programme is required.
2.2
Monitoring
should be carried out in stages:
1.
First
Stage: 3 days a week within the first two weeks of the dredging works at Lamma
Approach. The monitoring shall be
conducted on non-consecutive days.
2.
Second
Stage: If the monitoring results in first stage are found to be acceptable (no
exceedance of water quality related to the Project), the frequency of the
monitoring will be reduced to 1 day within the third and fourth weeks of the
dredging works, subject to the approval of HEC.
3.
Final
Stage: If the monitoring results obtained in second stage are found to be
acceptable, the monitoring will then cease, subject to the approval of HEC.
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
|
· Temperature (oC)
· Salinity (ppt)
· pH (pH value)
· Turbidity (NTU)
· Dissolved oxygen (DO) (mg/L and % of
saturation)
· Suspended solids (SS) (mg/L)
|
2.4
The water
sampler used for water quality monitoring was Kahlsico Water-Bottle Model
135DW150. The sampler 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
|
1
|
|
Multi-parameter Water Quality System
|
YSI 6820
|
2
|
|
Monitoring Position Equipment
|
“Magellan” Handheld GPS Model GPS-320
|
1
|
2.6
Table
2.3 summarizes the monitoring period and frequencies of water quality
monitoring.
Table 2.3 Frequency and Parameters of Water Quality Monitoring
|
Station
|
Parameters
|
Frequency
|
No. of depth
|
|
C2, C4, C5, SR1,
SR2, SR3, SR4, SR5, SR6 and SR7
|
SS, turbidity,
DO and in-situ parameters*
|
3 times a week within the first two
weeks of the dredging works, reduced to once a week in the third and fourth
week if no exceedance recorded
|
3
|
Notes:
* In-situ parameters
included temperature, pH, salinity and DO saturation.
2.7
A
total of ten water quality monitoring locations were selected. Table 2.4 describes the locations of these
monitoring stations. The locations of
the control and impact monitoring stations are shown in Figure 1.
Table
2.4 Locations of Water Quality Monitoring
Stations
|
Station
|
HK 1980 Grid
|
|
Easting
|
Northing
|
|
Control
|
|
|
|
C2
|
828608
|
813492
|
|
C4
|
826776
|
806464
|
|
C5
|
830440
|
802186
|
|
Impact
|
|
|
|
SR1
|
830224
|
811528
|
|
SR2
|
829004
|
810903
|
|
SR3
|
829194
|
808600
|
|
SR4
|
830119
|
808650
|
|
SR5
|
830386
|
807189
|
|
SR6
|
829977
|
805758
|
|
SR7
|
829566
|
804545
|
Instrumentation
2.8
A
multi-parameter meter (Model YSI 6820 CE-C-M-Y) was used to measure DO,
turbidity, salinity, pH and temperature.
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
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”.
2.13
Water
quality monitoring was conducted on 1st, 3rd, 5th,
8th and 15th March 2005 in both mid-ebb and mid-flood
tides while dredging works were taking place as per the monitoring schedule
(Appendix E).
2.14
The
weather during the monitoring session was sunny, cloudy or fine.
2.15
The
results from the impact monitoring stations were compared with that of the
control stations. The Action / Limit
Levels for the water quality monitoring are summarized in Appendix B.
2.16
No
exceedances for DO, turbidity and SS concentrations were recorded at the impact
monitoring stations. The monitoring data
of the impact monitoring stations were comparable to that of the control
stations. Further water quality
monitoring was not necessary.
2.17
No
major pollution source was observed.
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 D. No exceedance was recorded in the monitoring
event. No further action/ monitoring was
required.
3.3
The
implementation status of mitigation measures is summarized in Appendix F.
3.4
No
non-compliance was recorded during the site audits in the reporting month.
3.5
No
environmental complaint and prosecution was received during the reporting
month. The complaint log for the works
is provided in Appendix G.
4.1
Environmental
monitoring works were performed on 1st, 3rd, 5th,
8th and 15th March 2005 in accordance with the Work
Procedure while dredging works were undertaking. All monitoring results were checked and
reviewed.
4.2
There
was no Action/Limit Level exceedance for all the water quality parameters. No major pollution sources were
identified. Further monitoring was not
necessary.
4.3
The
dredging works were completed on 13th March 2005. No key
environmental issue was identified for the coming month.
