|
Client |
Territory Development Department, Hong Kong |
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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-170-00 |
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|
Date of Issue |
10 May 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\3128\ Reports\0170.doc |
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|
Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 9 - April 2004 |
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|
|
Name |
Sign |
Date |
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|
Prepared
by : |
Albert
Chan, ACL - Environmental Consultant |
|
10
May 2004 |
||
|
Reviewed by : |
Susana
Bezy, ACL – ET Leader |
|
10
May 2004 |
||
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Authorised by : |
Jon
Varndell, ACL – Project Mgr |
|
10
May 2004 |
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|
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|
Distribution |
|
|
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|
Copy No |
Issue to |
Attention |
Corr. Ref. |
||
|
1 |
TDD |
Mr
H H Yeung |
3128/M45/200/OC5962/al |
||
|
2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC5962/al |
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|
4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC5962/al |
||
|
5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC5962/al |
||
|
6 |
CRIII
Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC5962/al |
||
|
7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC5962/al |
||
|
8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC5962/al |
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9 |
Office
Copy |
|
|
||
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).............................................................................................................................. 5
Table 2.3 - Summary of Environmental Certification Sheet Submissions to
the Environmental Protection Department (EPD).................................................................................................................................... 7
Table 3.1 -
Summary of Impact EM&A Requirements................................................................. 10
Table
4.1 - Water Quality Monitoring Programme (Seawater Intakes Stations)............................ 13
Table
4.2 - Equipment for Air Quality
Monitoring...................................................................... 14
Table
4.3 - Noise Monitoring Equipment.................................................................................... 16
Table
4.4 - Equipment Used for Marine Water Quality Monitoring............................................. 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......................................... 19
Table
4.7 - Summary of Mid-Ebb Results for Seawater Intake Stations......................................... 20
Table
4.8 - Summary of Mid-Flood Results for Seawater Intake Stations...................................... 21
Table
6.1 - Water Quality Monitoring Programme...................................................................... 25
Air
Quality Action and Limit Levels for the City Hall Moni......................................................... 27
|
ACL |
Atkins China Limited |
|
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 Works,
Contract No. HK 12/02, was awarded to Leighton China State Van Oord Joint
Venture (LCSVO-JV) by the Territory Development Department (TDD), 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 TDD 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 ninth 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 April 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 1, 8, 15, 22 and 29 April 2004.
·
Noise monitoring was
performed continuously for 24 hours.
·
Water quality monitoring was
undertaken on the following days:
-
2 April 2004
-
5 April 2004
-
7 April 2004
-
9 April 2004
-
12 April 2004
-
14 April 2004
-
16 April 2004
-
19 April 2004
-
21 April 2004
-
23 April 2004
-
26 April 2004
-
28 April 2004
-
30 April 2004
Exceedance of Action and Limit Levels
There was no environmental air quality monitoring required during the
reporting period.
The noise monitoring carried out during the reporting did not find any
exceedances that were attributable to the project works. Although the continuous monitoring data
indicated several instances where the Leq (30 minutes) exceeded 75 dB(A),
investigations into these levels found that they were due to local noise
conditions at the City Hall monitoring location and were not due to the
project. Previous off-site inspections
carried out by the IEC noted that the main sources of noise near City Hall were
from helicopter and vehicle traffic and passer-by activities in the area.
From the analysis of water quality monitoring results collected during
the reporting period, no exceedances were identified as directly attributable
to the project marine works. However,
the dissolved oxygen (DO) and suspended solids (SS) levels exceeded the Action
and Limit Levels on one occasion and six occasions respectively. 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
There were no environmental complaints
received during this reporting period.
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 1, 8, 15, 22
and 29 April 2004. No environmental
non-conformance and deficiencies were observed during the site inspections.
Future Key Issues
Future Key Issues are as follows:
· Based on recent marine ground surveys, the Contractor has estimated that the volume of sediment to be dredged will be increased and that the new values will exceed the maximum dredging volume stipulated in the Environmental Permit (FEP-01/122/2003). The implications of this change with regard to the EIA were reviewed. It was noted that an increase in dredging quantity would not alter the findings of the water quality assessment since the Contractor is not proposing an increase in the dredging rates. Certification and verification for the variation of FEP Condition 3.2(b) for the maximum dredging volume has been issued.
· The temporary installation of pre-cast seawall caissons in IRAW is planned for 5 May and 6 May 2004. Cinotech Consultants Ltd. on behalf of the Contractor has conducted an environmental review of the unloading operation in April 2004. The review did not find any significant environmental impacts with the planned works.
· The Jet Grout Column Trials in the marine environmental commenced on 22 April 2004. However, due to technical difficulties with the equipment, the scheduled trials have been postponed until early May 2004. EPD has been notified on the trial. As the jet grouting may have the potential to impact water quality, the trials will be monitored closely and a water quality monitoring programme have been set up for the trials in the marine environment.
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. Construction works undertaken during the
reporting month include dredging, reclamation up to the original seabed level
only, marine site investigation, demolition preparation work at General Post
Office (GPO) Walkway and remedial works at Culvert F.
Atkins China Limited (ACL) has been commissioned by TDD 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 ninth monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 to 30 April 2004, inclusive.
The works undertaken during the reporting
month include dredging for the seawall foundation at IRAE, rockfilling, marine
piling at IRAW, superstructure works for Pier No. 7 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 a letter informing the termination of employment |
27
April 2004 |
- |
|
2 |
LCSVO-JV submitted an Application for Renewal of Construction Noise
Permit GW-TS0489-03 for the use of Powered Mechanical Equipment other than
percussive piling in Victoria Harbour during night-time |
26
April 2004 |
- |
|
3 |
LCSVO-JV submitted an Application for Construction Noise Permit for
Grouting Works of Pre-bored H-pile (Ref. H2189/U2c/6550/MP/DC/CKA/ST/cm) |
26
April 2004 |
- |
|
4 |
LCSVO-JV submitted updated application material for an Application for
a Permit to Dump Material (Uncontaminated Sediment) at Sea Under the Dumping
at Sea Ordinance (Ref. H2189/U2c/6398/MP/EY/ST/cm) |
15
April 2004 |
- |
|
5 |
LCSVO-JV submitted an Application for a Construction Noise Permit for
Grouting Works of Pre-bored H-pile (Ref. H2189/U2c/6326/MP/DC/CKA/ST/ec) |
9 April
2004 |
- |
|
6 |
LCSVO-JV submitted an Application for Construction Noise Permit for Unloading
and Temporary Storage of Pre-cast Seawall Units (Ref.
H2189/U2c/6287/MP/EY/MB/ST/atm). |
8 April
2004 |
- |
|
7 |
LCSVO-JV submitted an Application for a Permit to Dump Material
(Contaminated Sediment) at Sea Under the Dumping at Sea Ordinance (Ref.
H2189/U2c/6246/MP/ CST/EY/ST/atm). |
6 April
2004 |
- |
|
8 |
LCSVO-JV submitted additional information for an Application for a
Permit to Dump Material (Uncontaminated Sediment) at Sea under the Dumping at
Sea Ordinance (Ref. H2189/U2c/6216/MP/CST/EY/ST/ec). |
3 April
2004 |
- |
|
9 |
LCSVO-JV submitted a letter informing the termination of employment of
hopper barge (SB4) for dumping operation under two valid Marine Dumping
Permits No. EP/MD/04-133 and EP/MD/04-134 (Ref. H2189/U2c/6171/MP/CST/
EY/ST/atm). |
1 April
2004 |
- |
|
Table 2.2 - Summary of the Contractor's Environmental Related Document
Submissions to the Engineer’s Representatives (ER) |
|
Item |
Document
Title |
Version |
Date of
Submission to ER |
|
1 |
Advance
Notification of Night-time Construction Work (PLA) |
- |
29 April 2004 |
|
2 |
Construction
Noise Permit GW-TS0169-04 |
- |
29 April 2004 |
|
3 |
Marine
Dumping Permits (EP/MD/05-003) |
- |
26 April 2004 |
|
4 |
Environmental
Review of Submergence and Unloading of IRAW Package 1 Area |
- |
23 April 2004 |
|
5 |
Installation
Method Statement - IRAW Package 1 Storage |
0 |
19 April 2004 |
|
6 |
Alternative
Design - ESW JG Foundation Marine Trial, Supplementary Information to Detail
Method Statement and Environmental Issues |
- |
13 April 2004 |
|
7 |
Construction
Noise Permits (GW-TS0134-04 and GW-TS0135-04) |
- |
9 April 2004 |
|
8 |
Proposed
Sand Filling Method and Sequence at IRAE |
- |
7 April 2004 |
|
9 |
Proposed
Sand Filling Method and Sequence at IRAW |
- |
1 April 2004 |
A summary of the Environmental Certification Sheet submissions to EPD
for the Month of April 2004 is presented in Table 2.3.
|
No |
Certification
Subject |
Letter Ref. |
Date of
Submission to EPD |
Approved
Status |
|
1 |
Variation of FEP Condition 3.2(b) - Maximum
Dredging Volume |
3128/M45/200/OC5926/AC/al |
26
April 2004 |
- |
|
2 |
Certification of Monthly Environmental Report
No. 8 - March 2004 |
3128/M45/200/OC5887/AC/al |
14
April 2004 |
- |
No environmental meetings were held during
the reporting month.
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. Bi-weekly diving
inspections for the silt screens were also carried out in April 2004. During the reporting month, there were no
records of the Contractor not implementing relevant mitigation measures.
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 1, 8, 15, 22
and 29 April 2004.
Air quality monitoring has not commenced
yet as no work areas or construction activities with the potential to impact
air quality are within range of the closest air quality sensitive receivers.
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
April 2004 is presented in Table 4-1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
2 April 2004 |
Mid Ebb |
09:28 - 12:02 |
|
Mid Flood |
14:02 - 16:23 |
|
|
5 April 2004 |
Mid Ebb |
11:13 - 14:19 |
|
Mid Flood |
15:43 - 18:36 |
|
|
7 April 2004 |
Mid Ebb |
12:16 - 15:05 |
|
Mid Flood |
07:20 - 10:13 |
|
|
9 April 2004 |
Mid Ebb |
13:26 - 15:46 |
|
Mid Flood |
07:22 - 10:17 |
|
|
12 April 2004 |
Mid Ebb |
15:24 - 17:48 |
|
Mid Flood |
07:32 - 10:30 |
|
|
14 April 2004 |
Mid Ebb |
07:43 - 10:32 |
|
Mid Flood |
13:02 - 15:38 |
|
|
16 April 2004 |
Mid Ebb |
09:45 - 12:35 |
|
Mid Flood |
14:32 - 17:28 |
|
|
19 April 2004 |
Mid Ebb |
10:30 - 13:21 |
|
Mid Flood |
15:46 - 18:05 |
|
|
21 April 2004 |
Mid Ebb |
10:54 - 13:54 |
|
Mid Flood |
15:48 - 18:05 |
|
|
23 April 2004 |
Mid Ebb |
12:47 - 15:19 |
|
Mid Flood |
07:50 - 11:08 |
|
|
26 April 2004 |
Mid Ebb |
14:44 - 17:12 |
|
Mid Flood |
07:28 - 10:40 |
|
|
28 April 2004 |
Mid Ebb |
15:14 - 17:43 |
|
Mid Flood |
07:50 - 10:57 |
|
|
Mid Ebb |
08:10 - 10:45 |
|
|
Mid Flood |
12:44 - 15:01 |
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 |
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. |
No air quality monitoring work was undertaken
during the reporting period as no
work areas or 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 |
5.4 |
4.8 |
69.2 |
3.1 |
4 |
|
max |
8.0 |
7.6 |
109.8 |
6.8 |
9 |
|
|
avg |
6.1 |
6.0 |
82.1 |
5.0 |
6 |
|
|
sd |
0.7 |
0.7 |
10.8 |
1.0 |
2 |
|
|
C2 |
min |
5.5 |
5.1 |
72.6 |
3.1 |
4 |
|
max |
6.9 |
6.9 |
96.8 |
5.9 |
8 |
|
|
avg |
6.1 |
6.0 |
82.4 |
4.4 |
5 |
|
|
sd |
0.5 |
0.5 |
7.5 |
0.8 |
1 |
|
|
M7 |
min |
4.9 |
4.8 |
65.9 |
3.4 |
4 |
|
max |
6.6 |
6.4 |
91.1 |
8.1 |
9 |
|
|
avg |
5.7 |
5.5 |
76.4 |
5.0 |
6 |
|
|
sd |
0.5 |
0.5 |
7.3 |
1.3 |
1 |
|
|
M8 |
min |
4.8 |
5.0 |
64.8 |
3.1 |
4 |
|
max |
6.7 |
6.5 |
92.4 |
7.4 |
10 |
|
|
avg |
5.7 |
5.7 |
77.9 |
5.2 |
6 |
|
|
sd |
0.5 |
0.6 |
8.0 |
1.3 |
2 |
|
|
M9 |
min |
5.0 |
5.1 |
68.7 |
3.4 |
4 |
|
max |
7.0 |
6.8 |
96.6 |
11.4 |
13 |
|
|
avg |
5.8 |
5.7 |
79.0 |
5.7 |
7 |
|
|
sd |
0.6 |
0.5 |
8.4 |
2.1 |
2 |
|
|
M10 |
min |
5.4 |
5.2 |
69.3 |
3.7 |
5 |
|
max |
7.0 |
6.3 |
94.3 |
7.1 |
9 |
|
|
avg |
5.9 |
5.7 |
79.1 |
5.2 |
7 |
|
|
sd |
0.5 |
0.4 |
6.7 |
1.0 |
2 |
|
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 4.8
and 7.0 mg/L with an average value of 5.8 mg/L and DO measurements in the
bottom layer ranged from 5.0 to 6.5 mg/L with an average level of 5.7 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 5.4 to 8.0 mg/L with an average value of around 6.1
mg/L; DO measurements in the bottom layer ranged between 4.8 and 7.6 mg/L with
an average level of 6.0 mg/L.
SS levels during mid-ebb tide ranged from 4 to 10 mg/L with an average
value of 6 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 |
5.2 |
5.1 |
68.7 |
3.5 |
4 |
|
max |
7.6 |
8.3 |
110.3 |
7.9 |
11 |
|
|
avg |
6.0 |
6.0 |
82.2 |
5.2 |
6 |
|
|
sd |
0.6 |
0.8 |
10.6 |
1.4 |
2 |
|
|
C2 |
min |
5.4 |
5.3 |
71.1 |
2.1 |
4 |
|
max |
6.8 |
6.6 |
90.7 |
6.4 |
8 |
|
|
avg |
6.1 |
6.0 |
82.5 |
4.2 |
5 |
|
|
sd |
0.4 |
0.4 |
5.9 |
1.3 |
1 |
|
|
M7 |
min |
5.0 |
4.8 |
66.2 |
3.1 |
4 |
|
max |
6.5 |
6.6 |
91.5 |
6.0 |
8 |
|
|
avg |
5.7 |
5.6 |
76.8 |
4.8 |
6 |
|
|
sd |
0.5 |
0.5 |
6.7 |
1.0 |
2 |
|
|
M8 |
min |
5.0 |
4.8 |
65.2 |
2.4 |
4 |
|
max |
6.8 |
6.7 |
91.9 |
6.9 |
9 |
|
|
avg |
5.8 |
5.7 |
78.6 |
4.8 |
6 |
|
|
sd |
0.6 |
0.6 |
8.0 |
1.3 |
2 |
|
|
M9 |
min |
4.8 |
4.7 |
63.3 |
3.0 |
4 |
|
max |
6.6 |
6.8 |
93.0 |
7.7 |
9 |
|
|
avg |
5.7 |
5.6 |
76.8 |
4.8 |
6 |
|
|
sd |
0.6 |
0.6 |
8.1 |
1.4 |
1 |
|
|
M10 |
min |
4.9 |
4.8 |
64.5 |
3.2 |
4 |
|
max |
6.7 |
6.5 |
87.4 |
7.6 |
8 |
|
|
avg |
5.9 |
5.7 |
78.8 |
4.9 |
6 |
|
|
sd |
0.5 |
0.5 |
7.1 |
1.4 |
1 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 4.9 to 6.8 mg/L with an
average level of 5.8 mg/L while DO values in the bottom layer ranged between
4.8 and 6.7 mg/L with an average of 5.7 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 5.2 and 7.6 mg/L
with an average value of 6.1 mg/L and DO results in the bottom layer ranged
from 5.1 and 8.3 mg/L with an average of 6.0 mg/L.
SS content ranged between 4 and 9 mg/L (for stations M8 & M10) with
an average of 6 mg/L during mid-flood tide and ranged from 4 to 11 mg/L with an
average value of 6 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 |
4.5 |
61.3 |
4.2 |
6 |
|
max |
6.5 |
91.8 |
9.2 |
10 |
|
|
avg |
5.4 |
74.3 |
6.3 |
8 |
|
|
sd |
0.5 |
8.4 |
1.6 |
1 |
|
|
M2 |
min |
4.1 |
55.4 |
3.9 |
7 |
|
max |
5.6 |
79.3 |
29.3 |
47 |
|
|
avg |
5.0 |
68.3 |
9.2 |
14 |
|
|
sd |
0.5 |
7.4 |
6.3 |
11 |
|
|
M3 |
min |
4.1 |
58.8 |
4.0 |
5 |
|
max |
6.1 |
85.8 |
7.7 |
10 |
|
|
avg |
5.4 |
73.2 |
5.7 |
8 |
|
|
sd |
0.6 |
7.8 |
1.2 |
1 |
|
|
M4 |
min |
4.7 |
63.9 |
3.6 |
5 |
|
max |
6.2 |
87.0 |
8.6 |
15 |
|
|
avg |
5.3 |
72.2 |
6.1 |
8 |
|
|
sd |
0.5 |
6.3 |
1.2 |
2 |
|
|
M5 |
min |
4.6 |
64.8 |
4.0 |
5 |
|
max |
6.1 |
86.3 |
21.9 |
28 |
|
|
avg |
5.4 |
74.1 |
6.7 |
9 |
|
|
sd |
0.5 |
6.8 |
4.7 |
6 |
|
|
M6 |
min |
4.6 |
65.3 |
3.9 |
5 |
|
max |
6.2 |
87.0 |
11.6 |
18 |
|
|
avg |
5.5 |
74.3 |
6.1 |
8 |
|
|
sd |
4.6 |
65.3 |
3.9 |
5 |
|
|
M11 |
min |
4.9 |
66.5 |
3.3 |
5 |
|
max |
6.1 |
85.3 |
7.5 |
10 |
|
|
avg |
5.4 |
73.6 |
5.7 |
7 |
|
|
sd |
0.4 |
6.3 |
1.2 |
2 |
|
|
M12 |
min |
4.6 |
65.0 |
3.8 |
5 |
|
max |
6.2 |
87.3 |
8.3 |
11 |
|
|
avg |
5.4 |
74.2 |
5.7 |
8 |
|
|
sd |
0.4 |
6.1 |
1.4 |
2 |
|
Seawater intake results during mid-ebb tide, Table 4.7, show that DO levels ranged from 4.1 to 6.2 mg/L with an average of 5.1 mg/L. SS ranged between 4 and 15 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 M4 and M11, were found during the reporting month. 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 and M5 on 1, 7, 9 and 10 April 2004. Observations noted that the large patches of brown silty water generally dispersed westwards after discharge from the outfall. On 19 April 2004, a dark murky discharge was observed from an outfall between station M4 and M5. 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 |
4.8 |
66.2 |
3.8 |
5 |
|
max |
6.2 |
87.5 |
11.0 |
18 |
|
|
avg |
5.3 |
73.3 |
6.4 |
8 |
|
|
sd |
4.8 |
66.2 |
3.8 |
5 |
|
|
M2 |
min |
4.4 |
61.3 |
4.0 |
6 |
|
max |
6.5 |
91.6 |
11.5 |
17 |
|
|
avg |
5.2 |
71.4 |
7.4 |
11 |
|
|
sd |
0.7 |
10.2 |
2.5 |
4 |
|
|
M3 |
min |
4.4 |
60.0 |
4.3 |
6 |
|
max |
6.3 |
88.4 |
8.8 |
12 |
|
|
avg |
5.2 |
71.3 |
6.1 |
8 |
|
|
sd |
0.5 |
7.8 |
1.4 |
2 |
|
|
M4 |
min |
4.7 |
63.8 |
3.2 |
4 |
|
max |
6.1 |
86.0 |
9.3 |
18 |
|
|
avg |
5.4 |
73.5 |
5.9 |
8 |
|
|
sd |
0.5 |
7.6 |
1.7 |
4 |
|
|
M5 |
min |
4.4 |
60.0 |
3.5 |
4 |
|
max |
5.8 |
81.7 |
9.2 |
16 |
|
|
avg |
5.3 |
72.5 |
5.5 |
7 |
|
|
sd |
0.4 |
6.9 |
1.6 |
3 |
|
|
M6 |
min |
4.4 |
60.3 |
3.2 |
4 |
|
max |
5.8 |
81.2 |
7.7 |
10 |
|
|
avg |
5.2 |
70.9 |
5.4 |
7 |
|
|
sd |
0.4 |
7.0 |
1.1 |
2 |
|
|
M11 |
min |
5.0 |
67.1 |
3.5 |
5 |
|
max |
6.2 |
85.9 |
8.4 |
10 |
|
|
avg |
5.4 |
74.4 |
5.5 |
7 |
|
|
sd |
0.3 |
5.6 |
1.5 |
2 |
|
|
M12 |
min |
4.8 |
63.5 |
3.9 |
4 |
|
max |
5.7 |
82.2 |
7.4 |
10 |
|
|
avg |
5.2 |
71.4 |
5.5 |
7 |
|
|
sd |
0.3 |
5.9 |
1.0 |
2 |
|
During
mid-flood survey, Table 4.8 shows that DO levels at seawater intake stations
ranged from 4.1 to 6.2 mg/L with an average of 5.1 mg/L. SS ranged from 5 to 32 mg/L with an average
SS content of 8 mg/L. The above results
show that water quality during mid-flood tide was also generally good. Again, a few localised high SS levels were
found but these were found to be not due to project works. The few instances of poor water quality at
several seawater intake stations were due to adverse impacts from outfalls
located adjacent to the stations. The
instance of high SS at station M11 was caused by seawater intake maintenance
work carried out by the intake operator and not due to project works. As mentioned previously, large quantities of
silty discharges from outfalls near stations M4 and M5 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.
No exceedances of noise quality attributable
to project works were observed during the reporting period. Although there were a few instances where
the Leq (30 minutes) was found to be above 75 dB(A), these levels were
determined to be not due to project works.
The noise levels above 75 dB(A) recorded on 9 and 12 April were due to
increased passer-by activities during the public holidays.
The noise monitoring station situated at City
Hall is under the influence of a variety of noise sources in the area that
include helicopter traffic and vehicle movement at the drop off area in front
of City Hall. Pedestrian activity in
the area is another contributor of noise and tour groups also frequent the
site.
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 April 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 22 April 2004, and the IEC's site inspection report is
provided in Annex L.
During a site inspection conducted on 15 April
2004, it was observed that an external contractor was carrying out maintenance
work for Hongkong and Shanghai Banking Corporation's (HSBC) seawater pumping
station. These works were likely
responsible for the elevated SS levels at the adjacent seawater intake
monitoring station.
The Contractor commenced the Jet Grout Column
Trial on the morning of 22 April 2004.
Pre-drilling was first undertaken and field observations noted that the
water inside the silt curtain enclosure turned into a dark murky colour within
15 minutes of the test. The water
outside the silt curtain however was unaffected. Grout injection was then initiated once the drill rod reached
bottom level and within 5 minutes the water inside the curtain turned into a
murky brown colour. Around 10 minutes
after the grout injection, a small breach in the silt curtain was noticed near
the surface level and a small brown patch of water outside the silt curtain
could be seen. At around the same time,
the jet grouting equipment experienced a mechanical failure and the trial was
then terminated. Visual inspections by
field staff noted that the water inside silt curtain returned to normal
conditions after approximately 6 hours from the start of the trial. The Contractor also began to repair the silt
curtain and has postponed the next trial test until all necessary repairs have
been completed.
A comprehensive monitoring programme for
these works has been undertaken. The
results of the monitoring will be provided in the next monthly report.
Three complaints regarding the dumping of
rock fill were received during the reporting month. The first complaint, addressed to EPD and received on 9 April
2004, reported that the rock fill material came from an unapproved source. However, an investigation conducted by the
ER found that the allegation was unfounded, as the rock fill source in question
had been previously approved. The other
two complaints received on 19 April 2004 were also investigated and it was
found that only suitable rock fill materials were used.
The ER carries out inspections of the
Contractor's supply of rock fill to ensure the quality and correct grading of
rock. Rejected materials are returned
back to the originator. Additionally,
silt curtains are placed around the grab when depositing rock fill to avoid
dispersion of suspended solids and the water quality monitoring programme did
not find any exceedances attributable to the rock filling activities.
No environmental prosecution notices
or summons were received during the reporting period.
The key issues to be considered in the coming
month include the following:
·
The dredging works at IRAE
will continue and is expected to be completed by mid May 2004;
·
Temporary installation of
pre-cast caissons in IRAW;
·
Marine piling at IRAW;
·
Mobilisation for landside
piling at the Central Terminal Building (CTB);
·
The Jet Grout Column trial
will recommence;
·
Erection of formworks at
Pier No. 7; and
·
Maintenance and necessary
repairs to the seawater intake silt screens.
The construction works scheduled in April
2004 include dredging at IRAE, site investigation works and desilting work for
the Culvert F remedial works. 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 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 |
|
|
3 May 2004 |
11:16 |
17:00 |
|
5 May 2004 |
12:00 |
17:00 |
|
7 May 2004 |
08:30 |
14:00 |
|
10 May 2004 |
08:45 |
17:00 |
|
12 May 2004 |
11:47 |
17:00 |
|
14 May 2004 |
09:38 |
15:01 |
|
17 May 2004 |
11:29 |
17:00 |
|
19 May 2004 |
12:00 |
17:30 |
|
21 May 2004 |
08:00 |
13:30 |
|
24 May 2004 |
08:30 |
15:05 |
|
26 May 2004 |
08:30 |
16:53 |
|
28 May 2004 |
11:54 |
17:00 |
|
31 May 2004 |
10:06 |
16:25 |
|
2 June 2004 |
11:27 |
17:00 |
|
4 June 2004 |
08:00 |
13:30 |
|
7 June 2004 |
08:30 |
15:48 |
|
9 June 2004 |
10:21 |
17:00 |
|
11 June 2004 |
08:30 |
14:00 |
|
14 June 2004 |
10:31 |
16:54 |
|
16 June 2004 |
11:30 |
17:00 |
|
18 June 2004 |
12:00 |
17:30 |
|
21 June 2004 |
08:30 |
14:17 |
|
23 June 2004 |
08:30 |
15:38 |
|
25 June 2004 |
10:10 |
17:00 |
|
28 June 2004 |
08:44 |
15:07 |
|
30 June 2004 |
10:20 |
17:00 |
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 environmental performance criteria were found to be caused by
the project works. The water quality was
found to be generally good, but a few localised elevated SS concentrations and
one low DO level has 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.
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.