|
Client |
Civil Engineering and Development Department |
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|
Project |
Supplementary Agreement No. 3 to Agreement No. CE 15/94 Design and Construction for the Minimum Option |
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|
Report
No. |
3128-REP-177-00 |
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|
Date of Issue |
7 July 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\ 3128\Reports\0177.doc |
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|
Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 11 - June 2004 |
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|
|
Name |
Sign |
Date |
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|
Prepared
by : |
Albert
Chan, ACL - Environmental Consultant |
|
7
July 2004 |
||
|
Reviewed by : |
Susana
Bezy, ACL – ET Leader |
|
7
July 2004 |
||
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Authorised by : |
Jon
Varndell, ACL – Project Mgr |
|
7
July 2004 |
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|
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|
Distribution |
|
|
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|
Copy No |
Issue to |
Attention |
Corr. Ref. |
||
|
1 |
CEDD |
Mr
H H Yeung |
3128/M45/200/OC6182/al |
||
|
2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC6182/al |
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|
4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC6182/al |
||
|
5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC6182/al |
||
|
6 |
CRIII
Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC6182/al |
||
|
7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC6182/al |
||
|
8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC6182/al |
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9 |
Office
Copy |
|
|
||
1. INTRODUCTION
1.1 Basic Project Information
2.1 Works Undertaken
2.2 Environmental Permits
2.3 Environmental Document Submission
2.4 Environmental Meetings
2.5 Environmental Monitoring Locations
3.1 Summary of Impact EM&A Requirements
3.2 Environmental Quality Performance Limits
3.3 Event Action Plan
3.4 Implementation of Environmental Measures
4.1 Impact Monitoring
Schedule in June 2004
4.2 Monitoring Methodology
4.3 Monitoring Equipment
4.4 Impact Monitoring Results
5. Environmental
Complaint and Non-Compliance
5.1 Environmental Exceedances
5.2 Environmental
Complaint and Prosecution
5.3 Environmental
Enquiries
6.1 Key Issues for the
Coming Month
6.2 Monitoring Schedules
for the Next 3 Months
6.3 Construction Programme
for the Next 3 Months
List of Annexes
Annex A Project Organisation / Contact Information
Annex B Contractor’s Work Programme
Annex C Location of Monitoring Stations & Outfalls
Annex D Environmental Quality Performance Limits for Air, Noise and Water Quality
Annex E Event and Action Plan for Air, Noise and Water Quality
Annex F Noise Monitoring Results
Annex G Graphical Representation of Noise Monitoring Results
Annex H Water Quality Monitoring Results
Annex I Graphical Representation of Water Quality Monitoring Results
Annex J Water Quality Exceedance Review
Annex K IEC Site Inspection Report
List of Tables
Table 2.1 - Summary of the Environmental License / Permit Status................................................ 3
Table 2.2 - Summary of the Contractor's Environmental Related Document
Submissions to the Engineer’s Representatives (ER)........................................................................................................................... 4
Table 2.3 - Summary of Environmental Certification Sheet Submissions to
the Environmental Protection Department (EPD)................................................................................................................................. 6
Table 3.1 -
Summary of Impact EM&A Requirements................................................................... 9
Table
4.1 - Water Quality Monitoring Programme (Seawater Intakes Stations)............................ 12
Table
4.2 - Equipment for Air Quality
Monitoring...................................................................... 13
Table
4.3 - Noise Monitoring Equipment.................................................................................... 15
Table
4.4 - Equipment Used for Marine Water Quality Monitoring............................................. 16
Table
4.5 - Equipment Calibration Frequencies........................................................................... 17
Table
4.5 - Summary of Mid-Ebb Results for Marine-Based Stations............................................ 18
Table
4.6 - Summary of Mid-Flood Results for Marine-Based Stations......................................... 20
Table
4.7 - Summary of Mid-Ebb Results for Seawater Intake Stations......................................... 22
Table
4.8 - Summary of Mid-Flood Results for Seawater Intake Stations...................................... 24
Table
6.1 - Water Quality Monitoring Programme...................................................................... 28
|
ACL |
Atkins China Limited |
|
CEDD |
Civil Engineering and Development Department |
|
CRIII |
Central Reclamation Phase III |
|
EIA |
Environmental Impact Assessment |
|
EIAO |
Environmental Impact Assessment Ordinance |
|
EM&A |
Environmental Monitoring and Audit |
|
EPD |
Environmental Protection Department |
|
ER |
Engineer’s Representatives |
|
ET |
Environmental Team |
|
IEC |
Independent Environmental Checker |
|
LCSD |
Leisure and Cultural Services Department |
|
LCSVO-JV |
Leighton China State Van Oord Joint Venture |
|
TDD |
Territory Development Department |
|
TSP |
Total Suspended Particulates |
|
WMP |
Waste Management Plan |
Executive
Summary
The Central Reclamation Phase III (CRIII)
Works, Contract No. HK 12/02, was awarded to Leighton China State Van Oord
Joint Venture (LCSVO-JV) by the Territory Development Department (now called
the Civil Engineering and Development Department (CEDD) after the merger of the
Civil Engineering Department and the Territory Development Department on 1 July
2004),, Hong Kong Islands and Islands Development Office. The works under the Contract HK 12/02 commenced
on 28 February 2003. Contract HK 16/03
for the CRIII Hinterland Drainage Improvement Works was awarded to Wang Kee
Construction Co. Ltd. and works for this contract commenced on 17 December
2003.
Atkins China Limited (ACL) has been appointed by CEDD to implement the
Environmental Monitoring and Audit (EM&A) programme that was identified in
the EIA Report for the CRIII Project and is providing Environmental Team (ET)
services during the duration of the construction works.
This is the eleventh Monthly
EM&A Report under the EIAO for the
works specified in Section 1.3 of the CRIII EIA Report. This report summarises the monitoring
results and audit findings of the EM&A programme during the reporting
period from 1 to 30 June 2004.
Environmental Monitoring and Audit Progress
The monthly EM&A programme was undertaken in accordance with the
EM&A Manual. A summary of the
monitoring activities performed in this reporting month is listed below:
·
Environmental site inspections were
undertaken on 3, 10, 17 and 24 and 30 June 2004.
·
Noise monitoring was
performed continuously for 24 hours.
·
Water quality monitoring was
undertaken on the following days:
-
2 June 2004
-
4 June 2004
-
7 June 2004
-
9 June 2004
-
11 June 2004
-
14 June 2004
-
16 June 2004
-
18 June 2004
-
21 June 2004
-
23 June 2004
-
25 June 2004
-
28 June 2004
-
30 June 2004
Exceedance of Action and Limit Levels
There was no environmental air quality monitoring required during the
reporting period.
Continuous noise monitoring was carried out during the reporting
period. Although noise levels were
recorded below 75 dB(A), one noise complaint regarding marine piling noise was
received from Premier Management Services of Two International Finance Centre
(Two IFC) on 4 June 2004. An investigation
into the noise complaint found that the maximum noise level measured at Two IFC
is below the statutory Acceptable Noise Level (ANL) stipulated in the Technical
Memorandum (TM) on Noise from Percussive Piling under the Noise Control
Ordinance (NCO) Cap. 400. Further,
general noise levels from marine piling and construction works measured at the
outside area of the third floor of Two IFC have been found to be below the
noise standard of 75 dB(A) for daytime construction activities.
From the analysis of water quality monitoring results collected during
the reporting period, no exceedances were identified as being directly
attributable to the project marine works.
However, exceedances of the dissolved oxygen (DO) and suspended solids
(SS) Action and Limit Levels were found.
Investigations found that they were due to natural variation in ambient
conditions and/or local influencing factors.
A review of the monitoring results showed that control stations located
outside the project's influence had similar values as marine impact stations
and seawater intake monitoring data showed variable results with localised
exceedances near stormwater outfalls.
These findings were similar to the conditions observed during baseline
monitoring and silty discharges from outfalls within the project area were documented
during the reporting month.
Complaint Log
One environmental complaint regarding construction noise from marine
piling works was received in June 2004.
Based on an investigation of the complaint, it was found that the noise
generated from construction activities are within the acceptable noise level
and have been found to be in compliance with the CNP and Noise Control
Ordinance (NCO).
Notifications of Summons and Prosecutions
There were no notifications of summons or
prosecutions received with regard to the environment during this reporting
period.
Site Inspection and
Audit
Environmental site
inspections for the CRIII project works area were undertaken on 3, 10, 17 and 24 and 30 June 2004. No environmental
non-conformance and deficiencies were observed during the site inspections.
Future Key Issues
Future Key Issues are as follows:
· Sandfilling works at IRAW are scheduled to commence in July.
· Marine piling works in IRAW and dredging and desilting works in IRAE.
·
Landside piling for the
Central Terminal Building (CTB).
·
Landside cooling watermains
work.
The Main Works Contract HK 12/02 for CRIII commenced on 28th February
2003. Leighton-China State-Van Oord Joint Venture (LCSVO-JV) was awarded the
Contract No. HK 12/02 for the construction of the CRIII Engineering Works. Contract HK 16/03 for the CRIII Hinterland
Drainage Improvement Works was awarded to Wang Kee Construction Co. Ltd. and
works for this contract commenced on 17 December 2003.
Atkins China Limited (ACL) has been commissioned by TDD (now called
CEDD) to undertake the environmental
monitoring and audit work for the project in accordance with the Environmental
Permit (EP No. EP-122/2002) issued to TDD on 7 March 2002. The CRIII Project Organisation is shown in Annex
A.
This is the eleventh monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 to 30 June 2004, inclusive.
The works undertaken during the reporting
month include dredging and desilting works at IRAE, marine piling at IRAW, rock
filling works, pre-bored H-piles work for Central Terminal Building (CTB),
watermains diversion at the CTB, superstructure works for Pier No. 7, cooling
watermains work at Lung Wui Road, coring of jet grout columns at FRAE and
maintenance and necessary repair work for seawater intake silt screens.
A summary of the status of all environmental
permits, license, and/or notification to EPD for this project during the
reporting period are presented in Table 2.1.
|
Item |
Item
Description |
Date of
Application |
Permit Status |
|
1 |
LCSVO-JV submitted an Application for Renewal of Construction Noise
Permit (GW-TS0020-04) for the purpose of carrying out construction work other
than percussive piling (Ref. H2189/U2c/7609/MP/EY/ST/ec). |
15 June
2004 |
- |
|
2 |
LCSVO-JV submitted an Application for Construction Noise Permit for
night-time works on Man Yiu Street, Central (Ref.
H2189/U2c/7444/MP/DC/ST/ec). |
5 June
2004 |
- |
|
3 |
Application for Construction Noise Permit for unloading and temporary
storage of pre-cast caissons units (Ref. H2189/U2c/7356/MP/ST/ec) |
2 June
2004 |
- |
A summary of the status of the submissions provided
during the reporting month is presented in Table 2.2.
|
Item |
Document
Title |
Version |
Date of
Submission to ER |
|
1 |
Photographs
of Foamy Substance Discharged from Nearby Outfall (25 and 26 June 2004) |
- |
26 June 2004 |
|
2 |
Construction
Noise Permit (GW-TS0259-04) |
- |
25 June 2004 |
|
3 |
Wastewater
Discharge Licence (EP880/W10/XX0192) |
- |
15 June 2004 |
|
4 |
Marine
Dumping Permits (EP/MD/05-017) |
- |
12 June 2004 |
|
5 |
Construction
Noise Permit (GW-TS0243-04) |
- |
11 June 2004 |
A summary of the Environmental Certification Sheet submissions to EPD during
the reporting month is presented in Table 2.3.
|
No |
Certification
Subject |
Letter Ref. |
Date of
Submission to EPD |
Approved
Status |
|
1 |
Certification of Monthly Environmental Report
No. 10 - May 2004 |
3128/M45/200/OC6081/SB/
AC/al |
11 June
2004 |
- |
An environmental meeting was held on 24 June
2004 between Johnson's Control Hong Kong Limited (JCHKL), Hong Kong and Shanghai
Banking Corporation (HSBC), LCSVO-JV, CEDD, the ER and the ET to discuss HSBC's
concerns with rising seawater temperature in Victoria Harbour.
During the meeting, JCHKL on behalf of HSBC
presented a record of seawater flow temperature at HSBC's seawater pump
station. It was noted that seawater
temperature at the pump station reached 29°C between 18 June and 23 June 2004. JCHKL claims that the rise in seawater
temperature caused a decrease in the efficiency of HSBC's air conditioning
system. JCHKL and HSBC also reported
problems with their seawater intake silt screen. This separate issue is being dealt with between HSBC, the ER and
LCSVO-JV.
The ET and ER prior to the meeting conducted
an investigation of the rising seawater temperature. A review of the routine EM&A water quality monitoring results
found that the seawater temperatures recorded at the marine-based and seawater
intake stations are similar to those at the control stations, which are outside
the influence of the project works. It
was noted that although the seawater temperature at HSBC's intake is generally
around 0.5°C higher than other
monitoring stations, this difference is also evident in the baseline monitoring
results. Further, the Hong Kong
Observatory's sea surface temperature reading at North Point also reached 29°C in June.
As such, the rise in seawater temperature near HSBC's intake in June
2004 is due to the rise in ambient levels.
There is no evidence to indicate that the seawater temperature near
HSBC's intake is affected by the project works.
The environmental monitoring locations are
provided in Annex C.
The EM&A programme requires environmental monitoring for air
quality, noise, water quality, waste management and landscape and visual
aspects as specified in the CRIII Project EIA.
The EM&A requirements for each issue area are described in
subsequent sections including:
·
All required monitoring parameters;
·
Action and Limit Levels; and
·
Event-Action Plans.
A summary of impact EM&A requirements is presented in Table
3-1.
|
Descriptions |
Locations |
Frequencies |
Duration |
|||
|
TSP |
24-Hour
TSP |
2
Locations |
Once
every 6 days |
During
dust generating construction works |
||
|
1-Hour
TSP |
2
Locations |
Three
times in every 6 days |
During
dust generating construction works |
|||
|
Noise |
Leq (30
mins), L10, L90, |
1
Location |
Continuous
measurements |
Two
weeks before Construction and During Construction |
||
|
Water
Quality |
Dissolved
Oxygen; Salinity; Temp; Suspended
Solids; Turbidity. |
14
Locations |
3 times
a week, Mid-ebb/flood tides |
During
Marine Works |
||
|
Waste |
On-Site
Waste Audit |
Active
Work Sites |
Periodically |
During
Construction |
||
|
On-Site
Waste Inspection |
||||||
|
Landscape
and Visual |
Audits
to ensure effective implementation of mitigation measures |
During
Construction |
||||
|
General
Site Conditions |
Environmental
Site Inspection |
Works
areas and areas affected by works |
Periodically |
During
Construction |
||
Environmental Quality Performance Limits for air, noise and water
quality as provided in the Baseline Monitoring Report (Final) are shown in
Annex D.
The Event Action Plans for air, noise and water quality as provided in
the Baseline Monitoring Report (Final) are shown in Annex E.
The Contractor is required to implement mitigation measures listed in
the EIA Report, EM&A Manual and Further Environmental Permit. During routine site inspections, the
Contractor's implementation of mitigation measures is reviewed. With regard to mitigation measures for water
quality, the Contractor carried out daily visual inspection of the silt screens
for seawater intakes. Floating debris
in the project area was collected at least once everyday and in the water body
near cooling water intakes debris was collected at least three times a
day. Bi-weekly diving inspections for
the silt screens were also carried out in June 2004.
Regular site inspections were carried out
to assess whether the project's environmental protection and pollution control
measures are in compliance with the contract specifications. Inspections were conducted on 3, 10, 17 and 24 and 30 June 2004.
Air quality monitoring has not commenced
yet as no significant work areas or construction activities with the potential
to impact air quality are within range of the closest air quality sensitive
receivers (ASR). The ET will be
undertaking ad-hoc dust measurements at ASRs to ensure compliance.
Continuous 24-hour noise monitoring was
conducted during this reporting period.
Impact water quality monitoring at all
monitoring stations was undertaken during this reporting month. The water quality monitoring schedule for
June 2004 is presented in Table 4-1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
2 June 2004 |
Mid Ebb |
10:19 - 12:51 |
|
Mid Flood |
15:17 - 18:07 |
|
|
4 June 2004 |
Mid Ebb |
12:20 - 15:16 |
|
Mid Flood |
06:51 - 09:40 |
|
|
7 June 2004 |
Mid Ebb |
14:10 - 16:30 |
|
Mid Flood |
07:15 - 10:40 |
|
|
9 June 2004 |
Mid Ebb |
15:26 - 17:59 |
|
Mid Flood |
08:44 - 11:41 |
|
|
11 June 2004 |
Mid Ebb |
07:20 - 10:10 |
|
Mid Flood |
12:20 - 14:47 |
|
|
14 June 2004 |
Mid Ebb |
09:24 - 11:29 |
|
Mid Flood |
15:17 - 17:51 |
|
|
16 June 2004 |
Mid Ebb |
10:31 - 13:06 |
|
Mid Flood |
15:20 - 17:45 |
|
|
18 June 2004 |
Mid Ebb |
10:54 - 14:02 |
|
Mid Flood |
15:49 - 18:40 |
|
|
21 June 2004 |
Mid Ebb |
12:34 - 14:59 |
|
Mid Flood |
07:34 - 10:28 |
|
|
23 June 2004 |
Mid Ebb |
13:50 - 16:20 |
|
Mid Flood |
07:37 - 10:29 |
|
|
25 June 2004 |
Mid Ebb |
15:17 - 17:37 |
|
Mid Flood |
08:57 - 11:57 |
|
|
28 June 2004 |
Mid Ebb |
07:52 - 11:16 |
|
Mid Flood |
13:23 - 15:48 |
|
|
Mid Ebb |
09:29 - 12:06 |
|
|
Mid Flood |
15:30 - 18:12 |
Air quality monitoring will be performed in
accordance with the methodology described in the EM&A Manual once
construction activities requiring air quality monitoring commence. The locations of the monitoring stations at
City Hall and PLA Headquarters are shown in Annex C.
Continuous 24-hour noise monitoring was performed
in accordance with the methodology described in the EM&A Manual in the
reporting period. The location of the noise monitoring station at City Hall is
shown in Annex C.
Water quality monitoring was performed in
accordance with the methodology described in the EM&A Manual. Monitoring for the reporting month was
conducted at all stations, which comprises of 6 marine-based stations and 8
seawater intake stations. The locations
of the monitoring stations are shown in Annex C.
The equipment that is used
for air quality monitoring is listed in Table 4-2.
|
Parameter Measured |
Equipment |
|
24-Hour Sampling |
High Volume Sampler Model
GS2310 by Anderson Instruments to be used for both monitoring stations. |
|
1-Hour Sampling |
MicroDust pro Aerosol
Monitoring System to be used for both monitoring locations. |
The equipment used for
continuous noise quality monitoring is listed in Table 4-3.
|
Equipment |
Model |
|
Integrated Sound Level Meter (SLM) |
B&K 2238 |
|
Calibrator |
B&K 4231, Class 1 |
The equipment that was used
for water quality monitoring is listed in Table 4-4.
|
Parameter Measured |
Equipment |
|
Dissolved Oxygen and Temperature Measuring Equipment |
A Dissolved Oxygen meter YSI model 58 was used. ·
This
instrument was portable and weatherproof and used a DC power source. The equipment was capable of measuring: ·
DO levels
in the range of 0-20 mg/l and 0-200% saturation; and ·
Temperature
of between 0 - 45 degree Celsius. ·
The
equipment had a membrane electrode with an automatic temperature compensation
complete with a cable. In addition, a Wirling Psychrometer was used as a
reference thermometer during the sampling. |
|
Turbidity Measurement Instrument |
|
|
pH |
A MP125 pH Meter from Mettler Toledo was used to measure pH. |
|
Salinity / Conductivity Meter |
A Salinity / Conductivity meter YSI model 63 and model 30 was used for determining salinity concentrations. |
|
Sample Containers and Storage |
Water samples for SS analysis were stored in high density polythene bottles with no preservative added, packed in ice and delivered to the laboratory, and analysed as soon as possible after collection. |
The calibration frequencies
of the monitoring equipment are provided in the following table.
|
Equipment |
Calibration Frequency |
Latest Calibration Date |
|
Dissolved Oxygen Meter |
Every 6 months |
10 May 2004 |
|
Turbidimeter |
Every 3 months for
secondary standards; meter is calibrated prior to each measurement to the
secondary standards |
26 April 2004 |
|
pH Meter |
Prior to each sampling day |
- |
|
Pyschrometer |
Every 6 months |
2 February 2004 |
|
Integrated SLM |
Every year |
11 August 2003 |
No air quality monitoring work was undertaken
during the reporting period as no
significantly dusty construction activities with the potential to impact air
quality are within range of the closest air quality sensitive receivers.
Noise quality monitoring work was undertaken
during the reporting period. The noise
monitoring results are provided in Annex F. Graphical representation of the noise
monitoring data is provided in Annex G.
Water quality monitoring was undertaken at
all water quality monitoring locations during the reporting period. The water quality monitoring results from
this reporting period are presented in Annex H. Graphical representation of the water quality data is provided in
Annex
I. Summaries of the results are
provided in Tables 4.5 to 4.9.
Marine-Based Stations
Monitoring stations M8 and M10 were selected as the marine-based impact
stations as they are located outside the predicted influence of the dredging
and reclamation works. The detection of
water quality degradation at these two stations may indicate that project
marine works are adversely affecting water quality in Victoria Harbour. Stations M7 and M9 are within the expected
influence of the reclamation activities and are located along the works area
boundary (or extent of the predicted sediment plume). As such, M7 and M9 are used as indicator stations to note any
significant elevations in SS, turbidity or reductions in DO that may affect the
marine-based impact monitoring stations.
Table 4.5 is a summary of the marine-based stations monitoring results
during mid-ebb tide.
|
Station |
|
Parameter |
||||
|
DO (S&M) mg/L |
DO (B) mg/L |
DO % Sat. (DA) |
Turbidity (DA) NTU |
SS (DA) mg/L |
||
|
C1 |
min |
3.9 |
3.5 |
55.9 |
3.5 |
4 |
|
max |
7.5 |
6.1 |
106.4 |
7.6 |
8 |
|
|
avg |
5.6 |
4.6 |
80.6 |
5.3 |
5 |
|
|
sd |
1.1 |
0.8 |
13.6 |
1.2 |
1 |
|
|
C2 |
min |
4.3 |
3.9 |
60.1 |
3.5 |
4 |
|
max |
7.1 |
6.0 |
104.2 |
9.0 |
9 |
|
|
avg |
5.5 |
4.8 |
80.0 |
5.4 |
6 |
|
|
sd |
1.0 |
0.6 |
12.1 |
1.8 |
2 |
|
|
M7 |
min |
3.9 |
3.6 |
55.8 |
4.1 |
4 |
|
max |
7.4 |
6.2 |
99.3 |
9.2 |
9 |
|
|
avg |
5.6 |
4.8 |
80.2 |
5.8 |
6 |
|
|
sd |
1.1 |
0.6 |
13.3 |
1.9 |
2 |
|
|
M8 |
min |
3.7 |
3.5 |
53.7 |
3.7 |
3 |
|
max |
7.8 |
5.6 |
99.5 |
8.0 |
8 |
|
|
avg |
5.6 |
4.6 |
79.8 |
5.4 |
5 |
|
|
sd |
1.2 |
0.6 |
13.2 |
1.5 |
1 |
|
|
M9 |
min |
3.7 |
3.5 |
53.2 |
3.1 |
4 |
|
max |
7.4 |
6.3 |
106.8 |
8.7 |
12 |
|
|
avg |
5.7 |
4.7 |
80.8 |
5.4 |
6 |
|
|
sd |
1.1 |
0.8 |
13.4 |
1.5 |
2 |
|
|
M10 |
min |
3.7 |
3.4 |
51.7 |
3.4 |
4 |
|
max |
8.5 |
6.2 |
117.8 |
7.7 |
9 |
|
|
avg |
5.8 |
4.8 |
83.3 |
5.3 |
5 |
|
|
sd |
1.4 |
0.8 |
18.1 |
1.2 |
1 |
|
As Table 4.5 shows, DO levels at marine-based impact stations (M8 &
M10) in the surface to middle layer during mid-ebb survey ranged between 3.7
and 8.5 mg/L with an average value of 5.7 mg/L and DO measurements in the
bottom layer ranged from 3.4 to 6.2 mg/L with an average level of 4.7
mg/L. Similar DO levels were recorded
at the control stations at which DO levels in the surface to middle layer
during mid-ebb survey ranged from 3.9 to 7.5 mg/L with an average value of
around 5.6 mg/L; DO measurements in the bottom layer ranged between 3.5 and 6.1
mg/L with an average level of 4.7 mg/L.
SS levels during mid-ebb tide ranged from 3 to 9 mg/L with an average
value of 5 mg/L at the marine-based impact stations (M8 & M10), which is
comparable to results from the control stations in which SS content ranged from
4 to 9 mg/L with an average of 6 mg/L.
The results showed no clear gradient effect (high SS and low DO levels
from near-field stations M7 and M9 to far-field stations M8 and M10), which
indicates that dredging works are not adversely affecting marine water quality
outside the work site boundary in Victoria Harbour. Marine water quality at impact monitoring stations was found to
be similar to that at the control stations also indicating that project marine
works were not adversely affecting water quality in Victoria Harbour.
Table 4.6 is a summary of monitoring results from marine-based stations
during mid-flood tide.
|
Station |
|
Parameter |
||||
|
DO (S&M) mg/L |
DO (B) mg/L |
DO % Sat. (DA) |
Turbidity (DA) NTU |
SS (DA) mg/L |
||
|
C1 |
min |
4.4 |
3.7 |
63.7 |
3.9 |
3 |
|
max |
7.9 |
5.5 |
100.9 |
8.5 |
9 |
|
|
avg |
5.6 |
4.7 |
79.7 |
5.6 |
5 |
|
|
sd |
0.9 |
0.5 |
10.3 |
1.4 |
1 |
|
|
C2 |
min |
4.7 |
3.1 |
66.4 |
3.6 |
3 |
|
max |
6.9 |
5.3 |
92.4 |
7.3 |
7 |
|
|
avg |
5.5 |
4.6 |
78.7 |
4.9 |
5 |
|
|
sd |
0.7 |
0.6 |
7.7 |
1.1 |
1 |
|
|
M7 |
min |
4.3 |
4.2 |
64.0 |
3.8 |
4 |
|
max |
7.3 |
5.0 |
94.9 |
10.2 |
9 |
|
|
avg |
5.3 |
4.6 |
76.7 |
5.8 |
6 |
|
|
sd |
0.9 |
0.3 |
9.5 |
1.7 |
1 |
|
|
M8 |
min |
4.4 |
3.8 |
65.3 |
3.9 |
4 |
|
max |
8.7 |
5.7 |
106.6 |
7.4 |
9 |
|
|
avg |
5.6 |
4.7 |
79.5 |
5.1 |
5 |
|
|
sd |
1.1 |
0.6 |
10.8 |
1.0 |
2 |
|
|
M9 |
min |
4.2 |
3.5 |
61.8 |
4.1 |
3 |
|
max |
7.7 |
5.1 |
93.6 |
9.0 |
8 |
|
|
avg |
5.5 |
4.6 |
77.9 |
5.7 |
6 |
|
|
sd |
0.9 |
0.5 |
8.6 |
1.4 |
1 |
|
|
M10 |
min |
3.9 |
3.9 |
59.8 |
3.9 |
3 |
|
max |
8.9 |
6.0 |
120.8 |
8.5 |
9 |
|
|
avg |
5.7 |
4.9 |
82.5 |
5.7 |
6 |
|
|
sd |
1.2 |
0.6 |
14.4 |
1.4 |
2 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 3.9 to 8.9 mg/L with an
average level of 5.7 mg/L while DO values in the bottom layer ranged between
3.8 and 6.0 mg/L with an average of 4.8 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 4.4 and 7.9 mg/L
with an average value of 5.4 mg/L and DO results in the bottom layer ranged
from 3.1 and 5.5 mg/L with an average of 5.1 mg/L.
SS content ranged between 3 and 9 mg/L (for stations M8 & M10) with
an average of 6 mg/L during mid-flood tide and ranged from 3 to 7 mg/L with an
average value of 5 mg/L at the control stations. Again, the results showed no clear gradient effect and no significant
difference between control stations and marine-based impact stations. Therefore, the marine-based station results
indicate that during the reporting month the dredging works were not adversely
affecting water quality outside the work site boundary.
Seawater Intake Stations
Table 4.7 is a summary of monitoring results from seawater intake
stations during mid-ebb tide.
|
Station |
|
Parameter |
|||
|
DO mg/L |
DO % Sat. |
Turbidity NTU |
SS mg/L |
||
|
M1 |
min |
4.4 |
67.6 |
4.7 |
6 |
|
max |
6.9 |
107.1 |
10.3 |
11 |
|
|
avg |
5.0 |
77.3 |
6.9 |
8 |
|
|
sd |
0.8 |
12.6 |
1.5 |
1 |
|
|
M2 |
min |
4.1 |
62.0 |
4.5 |
7 |
|
max |
6.2 |
95.6 |
9.1 |
15 |
|
|
avg |
4.7 |
71.2 |
6.8 |
10 |
|
|
sd |
0.7 |
11.4 |
1.6 |
2 |
|
|
M3 |
min |
3.8 |
57.2 |
4.4 |
5 |
|
max |
5.6 |
87.6 |
7.8 |
18 |
|
|
avg |
4.7 |
72.0 |
5.8 |
8 |
|
|
sd |
0.5 |
8.5 |
1.1 |
3 |
|
|
M4 |
min |
4.2 |
64.0 |
3.7 |
5 |
|
max |
6.4 |
98.1 |
8.5 |
12 |
|
|
avg |
5.0 |
75.5 |
5.5 |
8 |
|
|
sd |
0.7 |
10.8 |
1.5 |
2 |
|
|
M5 |
min |
4.3 |
64.8 |
3.9 |
5 |
|
max |
6.9 |
105.2 |
8.6 |
13 |
|
|
avg |
5.2 |
79.4 |
5.4 |
8 |
|
|
sd |
0.8 |
12.8 |
1.3 |
2 |
|
|
M6 |
min |
4.2 |
63.7 |
3.3 |
5 |
|
max |
6.7 |
103.3 |
7.9 |
11 |
|
|
avg |
5.3 |
81.2 |
5.0 |
7 |
|
|
sd |
4.2 |
63.7 |
3.3 |
5 |
|
|
M11 |
min |
4.2 |
61.6 |
3.3 |
4 |
|
max |
6.4 |
98.3 |
11.8 |
11 |
|
|
avg |
5.4 |
82.0 |
5.8 |
7 |
|
|
sd |
0.7 |
10.7 |
2.4 |
2 |
|
|
M12 |
min |
4.4 |
67.1 |
3.8 |
4 |
|
max |
6.3 |
96.8 |
8.2 |
15 |
|
|
avg |
5.1 |
78.1 |
5.3 |
7 |
|
|
sd |
0.6 |
9.2 |
1.5 |
3 |
|
Seawater intake results during mid-ebb tide, Table 4.7, show that DO levels ranged from 3.8 to 6.9 mg/L with an average of 5.2 mg/L. SS ranged between 4 and 18 mg/L with an average value of 8 mg/L. The monitoring results show that water quality at seawater intake stations was generally good. Only a few elevated SS levels, such as at stations M3 to M6, were found during the reporting month. Low DO levels at the intake stations were also recorded during the reporting month but investigations found that they were not due to project works. The poor water quality at these stations are likely due to adverse impacts from outfalls located adjacent to the station. During the reporting month silty discharges from outfalls were observed and documented near stations M4 to M6 on 2 June and 30 June 2004. Observations noted that the large patches of brown silty water generally dispersed westwards after discharging from the outfall. Further, foamy discharges from these outfalls were observed on 25, 26 and 28 June 2004 after rainfall. Investigations into these discharges were conducted and they were found to be not related to project works. A figure showing the location of various outfalls along the seawall within the project area is shown in Annex C.
Table 4.8 is a summary of monitoring results from seawater intake
stations during mid-flood tide.
|
Station |
|
Parameter |
|||
|
DO mg/L |
DO % Sat. |
Turbidity NTU |
SS mg/L |
||
|
M1 |
min |
3.8 |
58.0 |
4.4 |
6 |
|
max |
7.6 |
119.8 |
10.5 |
17 |
|
|
avg |
5.1 |
77.7 |
6.4 |
8 |
|
|
sd |
3.8 |
58.0 |
4.4 |
6 |
|
|
M2 |
min |
3.6 |
54.6 |
5.4 |
5 |
|
max |
5.2 |
82.2 |
10.2 |
20 |
|
|
avg |
4.4 |
67.5 |
7.3 |
11 |
|
|
sd |
0.5 |
8.5 |
1.6 |
4 |
|
|
M3 |
min |
3.7 |
55.7 |
4.2 |
6 |
|
max |
5.6 |
87.8 |
8.6 |
17 |
|
|
avg |
4.5 |
69.1 |
6.1 |
9 |
|
|
sd |
0.6 |
9.6 |
1.3 |
4 |
|
|
M4 |
min |
3.8 |
57.2 |
3.6 |
4 |
|
max |
6.1 |
92.7 |
7.9 |
13 |
|
|
avg |
4.9 |
74.2 |
5.6 |
8 |
|
|
sd |
0.7 |
10.2 |
1.3 |
3 |
|
|
M5 |
min |
3.9 |
59.4 |
4.3 |
4 |
|
max |
6.3 |
96.8 |
7.4 |
11 |
|
|
avg |
4.9 |
75.4 |
5.6 |
8 |
|
|
sd |
0.8 |
11.4 |
1.1 |
2 |
|
|
M6 |
min |
3.8 |
58.4 |
3.5 |
4 |
|
max |
6.2 |
94.6 |
10.0 |
13 |
|
|
avg |
4.9 |
74.1 |
5.5 |
7 |
|
|
sd |
0.8 |
12.1 |
1.7 |
2 |
|
|
M11 |
min |
4.2 |
63.0 |
3.5 |
5 |
|
max |
8.0 |
125.2 |
7.1 |
9 |
|
|
avg |
5.3 |
81.3 |
5.4 |
7 |
|
|
sd |
1.0 |
16.7 |
1.2 |
1 |
|
|
M12 |
min |
3.8 |
57.8 |
4.0 |
4 |
|
max |
6.1 |
92.9 |
7.0 |
11 |
|
|
avg |
4.8 |
73.3 |
5.1 |
7 |
|
|
sd |
0.7 |
11.2 |
1.0 |
2 |
|
During
mid-flood survey, Table 4.8 shows that DO levels at seawater intake stations
ranged from 3.4 to 6.5 mg/L with an average of 5.1 mg/L. SS ranged from 5 to 18 mg/L with an average
SS content of 9 mg/L. The above results
show that water quality during mid-flood tide was also generally good. Again, localised high SS levels and low DO
levels were found but these were found to be not due to project works. The instances of poor water quality at
several seawater intake stations were either due to adverse impacts from
outfalls located adjacent to the stations or local ambient conditions in the
area. As mentioned previously, large
quantities of silty discharges from outfalls near stations M4 to M6 have been
observed and documented on various occasions during the reporting month. A figure showing the location of various
outfalls along the seawall within the project area is shown in Annex C.
No waste management audit was scheduled
within this reporting period. The
arrangement of waste management audit is detailed in the Waste Management Plan.
As the works undertaken during the reporting
month were related to site investigation works, demolition works and dredging
works, the landscape and visual impacts are considered to be minimal.
The total number of exceedances for air,
noise and water quality are presented in following sections.
No air quality monitoring work was undertaken
during the reporting period.
One noise complaint concerning marine piling
works was received from Premier Management Services of Two
International Finance Centre (Two IFC) on 4 June 2004. An investigation into the noise complaint
found that the maximum noise level measured at Two IFC is below the statutory
Acceptable Noise Level (ANL) stipulated in the Technical Memorandum (TM) on
Noise from Percussive Piling under the Noise Control Ordinance (NCO) Cap.
400. Further, general noise levels from
marine piling and construction works measured at the outside area, third floor
of Two IFC are below the noise standard of 75 dB(A) for daytime construction
activities.
Based on investigations and analyses of water
quality monitoring results collected during the reporting month, it was found
that no exceedances of the Action and Limit Levels were attributable to the
project marine works. Although DO
levels below the Action Level were observed at seawater intake stations,
investigations found that they were due to natural variation or changes in
ambient conditions and not caused by the project marine works. It was
noted that during the reporting month, water quality at marine-based impact
monitoring stations (M8 and M10) was found to be similar to the control
stations.
The June 2004 monitoring results showed, on a
few occasions, elevated concentrations of SS were recorded above the Action
and/or Limit Level at seawater intake stations. Investigations into these monitoring results found that the SS
levels are likely attributed to discharge influences from outfalls located in
proximity of seawater intake monitoring stations. All of the higher SS concentrations recorded were shown to be
localised conditions as no increased SS levels were detected at the
marine-based impact stations and no unusual concentrations were measured at
adjacent monitoring stations during the same time. High SS levels were often recorded at locations (stations M1 to
M6) with outfalls and stormwater culverts that discharge into the harbour. Baseline monitoring results showed similar
localised elevated concentrations of SS.
No non-compliances with regard to waste
management were recorded in the reporting month.
No non-compliance with regard to landscape
and visual aspects were recorded in the reporting month.
No environmental non-compliances were found
during environmental site inspections conducted during the reporting
period. A joint site inspection with
the IEC was conducted on 17 June 2004, and the IEC's site inspection report is
provided in Annex K.
During the site inspection conducted on 17
June 2004, the Contractor was reminded to cover exposed earth properly at site
CR-10.
On 24 June 2004, the site inspection found
some stagnant water in the U-channels located within site CR-13 and some
ponding water was also found on the pavement area. The Contractor agreed to clean the U-channels and gullies to
prevent mosquito breeding. The
Contractor noted that mosquito oil is sprayed on potential breeding areas
around the project site every 2 to 5 days.
During the site inspection conducted on 30
June 2004, some silt and standing water were found in the U-channels at site
CR-16. The Contractor was asked to be
more vigilant in clearing standing water after rainfall. Further, the Contractor was asked to place
backhoe buckets in a position to avoid the collection of standing water at site
CR-7.
One noise complaint concerning marine
piling works was received from Premier Management Services of Two IFC on 4 June
2004. An investigation into the noise
complaint found that the maximum noise level measured at Two IFC is below the
statutory ANL. Further, general noise
levels from marine piling and construction works measured at the outside area,
third floor of Two IFC are below the noise standard of 75 dB(A) for daytime
construction activities.
Based on the investigation of the
complaint, it was found that the noise generated from construction activities
in the vicinity of Two IFC are within the acceptable noise level and have been
found to be compliant with the CNP and NCO.
No prosecution notices or summons
were received during the reporting period.
An enquiry from Hongkong Land (HKL)
concerning seawater quality and deterioration of plant equipment at their
seawater pumping station was received on 10 June 2004. HKL reported an increase in SS levels from
their monthly seawater monitoring programme at their pumping station during the
past nine months and claimed that this increase is caused by the dredging works
of the CRIII project.
An investigation into HKL's enquiry was
conducted and a comparison of the HKL and EM&A water quality monitoring
results was undertaken. The comparison
of SS concentrations shows a large discrepancy between the EM&A results and
the HKL reported data. It was noted
that HKL's reported SS levels were generally higher than the EM&A
results. Further, dredging records from
resident site staff showed that no dredging works were conducted on several of
the sampling days in which HKL reported increased SS levels. Based on the findings of the investigation,
there is no evidence to indicate that the deterioration of the HKL pumping
station plant equipment is attributed to CRIII dredging works.
Another enquiry was received from Hong Kong
and Shanghai Banking Corporation (HSBC) regarding their concerns for rising
seawater temperature in Victoria Harbour in June 2004.
HSBC, from their seawater monitoring records,
noted that seawater temperature at their pump station reached 29°C between 18 June and 23 June 2004. They claimed that the rise in seawater
temperature caused a decrease in the efficiency of their air conditioning
system. Additionally, HSBC reported
problems with their seawater intake silt screen and this issue is being dealt
with between HSBC, the ER and LCSVO-JV.
An investigation into HSBC'c concerns for
rising seawater temperature at their pumping station was conducted. A review of the routine EM&A water
quality monitoring results found that the seawater temperatures recorded at the
marine-based and seawater intake stations are similar to those recorded at the
control stations, which are outside the influence of the project works. It was noted that although the seawater
temperature at HSBC's intake is generally around 0.5°C higher than other monitoring stations, this
difference is also shown in the baseline monitoring results. Further, the Hong Kong Observatory's sea
surface temperature reading at North Point also reached 29°C in June.
As such, the rise in seawater temperature at HSBC's intake is due to the
rise in ambient levels throughout Hong Kong waters. There is no evidence to indicate that the project works is
affecting the seawater temperature near HSBC's intake.
The key issues to be considered in the coming
month include the following:
·
Remaining dredging and
desilting works at IRAE;
·
Marine piling and
commencement of sand filling works at IRAW;
·
Pre-bored H piles work for
landside piling at the Central Terminal Building (CTB);
·
Superstructure works at Pier
No. 7;
·
Cooling watermains work at
Lung Wui Road; and
·
Maintenance and necessary
repairs to the seawater intake silt screens.
The construction works scheduled for the
coming months include marine piling, dredging, desilting works at IRAE,
sandfilling at IRAW, landside piling, cooling watermains work and
superstructure works at Pier No. 7.
Based on the Contractor’s programme, the Environmental Monitoring
Programme for the next three months is planned as follows:
TSP (24 hr and 1 hr monitoring)
Upon commencement of significant dust generating
activities within range of the closest air quality sensitive receiver,
dependent upon the Contractor’s programme.
Noise (Continuous Measurements)
The noise monitoring programme throughout the
entire construction period is 24-hour continuous.
Water Quality Monitoring
The water quality monitoring schedule for the next
3 months is provided in the following table.
|
Date of Sampling |
Sampling Time |
|
|
2 July 2004 |
12:00 |
17:30 |
|
5 July 2004 |
08:30 |
14:40 |
|
7 July 2004 |
09:13 |
16:11 |
|
9 July 2004 |
11:13 |
17:00 |
|
12 July 2004 |
09:27 |
15:59 |
|
14 July 2004 |
10:46 |
17:00 |
|
16 July 2004 |
11:53 |
17:00 |
|
19 July 2004 |
08:30 |
14:00 |
|
21 July 2004 |
08:30 |
14:46 |
|
23 July 2004 |
09:17 |
15:58 |
|
26 July 2004 |
08:30 |
14:00 |
|
28 July 2004 |
09:12 |
16:50 |
|
30 July 2004 |
11:02 |
17:00 |
|
2 August 2004 |
08:30 |
14:00 |
|
4 August 2004 |
08:30 |
14:55 |
|
6 August 2004 |
09:51 |
16:07 |
|
9 August 2004 |
08:30 |
14:38 |
|
11 August 2004 |
09:34 |
17:00 |
|
13 August 2004 |
10:53 |
17:00 |
|
16 August 2004 |
12:00 |
17:30 |
|
18 August 2004 |
08:30 |
14:38 |
|
20 August 2004 |
08:38 |
15:04 |
|
23 August 2004 |
11:56 |
17:00 |
|
25 August 2004 |
08:30 |
17:00 |
|
27 August 2004 |
10:03 |
17:00 |
|
30 August 2004 |
12:00 |
17:30 |
|
1 September 2004 |
08:30 |
14:00 |
|
3 September 2004 |
08:49 |
14:57 |
|
6 September 2004 |
11:51 |
16:28 |
|
8 September 2004 |
08:30 |
17:00 |
|
10 September 2004 |
09:36 |
17:00 |
|
13 September 2004 |
11:40 |
17:00 |
|
15 September 2004 |
12:00 |
17:30 |
|
17 September 2004 |
08:30 |
14:06 |
|
20 September 2004 |
10:41 |
16:15 |
|
22 September 2004 |
08:30 |
17:00 |
|
24 September 2004 |
08:53 |
16:54 |
|
27 September 2004 |
11:26 |
17:00 |
|
29 September 2004 |
12:00 |
17:30 |
The construction programme for the next 3
months is provided in Annex B and will be updated by the
Contractor.
The ET will follow the Contractor’s proposed programme to ensure the compliance of environmental performance and proper implementation of all necessary mitigation measures.
During the reporting period,
no exceedances of the water quality criteria were found to be caused by the
project works. The water quality within
the project area was found to be generally good, but a few localised elevated
SS concentrations and low DO levels have been recorded. These levels were investigated and are
attributed to either ambient conditions or adverse influencing factors
unrelated to project marine works. It
was found that discharges from outfalls and stormwater culverts located near
seawater intake monitoring stations are major influencing factors that
adversely impact water quality within the works site area.
The marine-based impact
monitoring stations established to monitor the overall impact of the
reclamation activities on water quality in Victoria were shown to have similar
results as the control stations which are located outside the influence of
project works. As such, the water
quality monitoring results did not indicate that the marine works were
adversely affecting water quality outside the works boundary in Victoria
Harbour.
One complaint regarding
noise from marine piling works was received from Premier Management Services of
Two IFC during the reporting quarter.
An investigation found that the noise levels from marine piling works
and construction activities are within the ANL and are compliant with the NCO.
The monitoring work for this
reporting month has been independently verified by the Independent
Environmental Checker (IEC) and has been found to be in compliance with the
requirements of the EM&A programme.