|
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-168-00 |
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Date of Issue |
8 April 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\3128\ Reports\0168.doc |
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|
Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 8 - March 2004 |
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|
Name |
Sign |
Date |
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|
Prepared
by : |
Albert Chan,
ACL - Environmental Consultant |
|
8
Apr. 2004 |
||
|
Reviewed by : |
Susana
Bezy, ACL – ET Leader |
|
8
Apr. 2004 |
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Authorised by : |
Jon
Varndell, ACL – Project Mgr |
|
8
Apr. 2004 |
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|
Distribution |
|
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|
Copy No |
Issue to |
Attention |
Corr. Ref. |
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|
1 |
TDD |
Mr
H H Yeung |
3128/M45/200/OC5887/al |
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|
2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC5887/al |
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|
4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC5887/al |
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|
5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC5887/al |
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|
6 |
CRIII
Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC5887/al |
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7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC5887/al |
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8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC5887/al |
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9 |
Office
Copy |
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5. Environmental
Complaint and Non-Compliance.................................................. 39
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
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
|
ACL |
Atkins China Limited |
|
CRIII |
Central Reclamation Phase III |
|
EIA |
Environmental Impact Assessment |
|
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 eighth 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 31 March 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 4,
11, 18 and 25 March 2004.
·
Noise monitoring was performed continuously for 24
hours.
·
Water quality monitoring was undertaken on the
following days:
-
1 March 2004
-
3 March 2004
-
5 March 2004
-
8 March 2004
-
10 March 2004
-
12 March 2004
-
15 March 2004
-
17 March 2004
-
19 March 2004
-
22 March 2004
-
24 March 2004
-
26 March 2004
-
29 March 2004
-
31 March 2004
Exceedance of Action and Limit Levels
There was no environmental air quality monitoring required during the
reporting period.
The noise monitoring results for the reporting period did not show any
exceedances.
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,
on several occasions, the dissolved oxygen (DO) and suspended solids (SS)
levels exceeded the Action and Limit Levels.
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 4, 11, 18 and 25 March 2004. No environmental non-conformance and deficiencies were observed
during the site inspections.
Future Key Issues
Future Key Issues are as follows:
·
The Contractor submitted an alternate design for
the Eastern Seawall foundation using jet grout column to the ER and is
proposing to prepare a trial demonstration in the marine environment. The Contractor is proposing to implement an
addition water quality monitoring programme for this trial. Advice from EPD and TDD is being sought with
regard to this proposal.
·
With regard to the increase in volume of sediment
to be dredged, the ER has reviewed the calculations and is in agreement with
the Contractor's revised dredging volume.
Further, the ET and IEC have reviewed the implications of this change
with respect to the EIA registered under the EIA Ordinance. Based on the water quality impact assessment
provided in the EIA, an increase in dredging quantity will not alter the findings
of the water quality assessment.
·
Marine piling works have recommenced on 31 March
2004 and are expected to continue in the coming months.
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 eighth monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 to 31 March 2004, inclusive.
The works undertaken during the reporting
month were limited to dredging, rockfilling, removal of berm stone and armour
rock along existing seawall at IRAW, maintenance and necessary repair work for
seawater intake silt screens, mobilisation to commence superstructure works on
Pier No. 7 and demolition of the General Post Office (GPO) Walkway.
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 a Permit to Dump Material (Uncontaminated Sediment) at Sea
Under the Dumping at Sea Ordinance (Ref. H2189/U2c/6007/MP/ CST/EY/ST/ec) |
24
March 2004 |
- |
|
2 |
LCSVO-JV submitted an
Application for a Construction Noise Permit for the use of Power Mechanical
Equipment for the purpose of carry out construction work other than
percussive piling at Lung Wui Road (Ref. H2189/U2c/6001 /MP/DC/KTY/ST/cm) |
23
March 2004 |
- |
|
3 |
LCSVO-JV submitted a
Renewal of Construction Noise Permit (GW-TS0432-03) for the use of PMEs for
the purpose of carrying out construction work other than percussive piling
(Ref. H2189/U2c/5975/MP/CST/DS/ST/ atm) |
22
March 2004 |
- |
|
4 |
LCSVO-JV submitted an
Application for a Construction Noise Permit for the use of Power Mechanical
Equipment for the purpose of carry out construction work other than
percussive piling in Victoria Harbour opposite to the Central Barracks (Ref.
H2189/U2c/5798/MP/CST/EY/ST /atm). |
15
March 2004 |
- |
|
5 |
LCSVO-JV submitted an
Application for a Combined Renewal of Construction Noise Permits
(GW-TS0489-03 & GW-TS-0573-03) for the use of Power Mechanical Equipment
for the purpose of carry out construction work other than percussive piling
(Ref. H2189/U2c/5798/MP/ CST/EY/ST/atm). |
15
March 2004 |
- |
|
6 |
LCSVO-JV submitted an
Application for a Permit to Dump Material (Uncontaminated Sediment) at Sea
Under the Dumping at Sea Ordinance (Ref. H2189/U2c/5778/MP/ CST/EY/ST/cm) |
12
March 2004 |
- |
|
7 |
LCSVO-JV submitted
additional information for an Application for a Permit to Dump Material
(Contaminated Sediment) at Sea Under the Dumping at Sea Ordinance |
10
March 2004 |
- |
|
8 |
LCSVO-JV submitted an
Application for a Construction Noise Permit (GW-TS0098-04) for the use of
Power Mechanical Equipment for the purpose of carry out construction work
other than percussive piling during evening and nighttime in Victoria Harbour
near Pier No. 7 (Ref. H2189/U2c/5798/MP/CST /EY/ST /atm). |
8 March
2004 |
23 March
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 |
Variation
of FEP Condition 3.2(b) - Maximum Dredging Volume (Ref.
H2189/C1/6080/MP/CST/EY/ST/cm). |
- |
27 March 2004 |
|
2 |
Alternate
Design - ESW Foundation using JG Column - Trial in Marine Environment:
Potential Locations for Trial and Advanced Detail Method Statement (Ref.
H2189/C1/6060/MP/HKC/cm) |
- |
26 March 2004 |
|
3 |
Trip
Tickets for the Disposal of Chemical Waste under the Waste Diposal (Chemical
Waste) (General) Regulation (Ref. H2189/C1/6034/MP/ST/ec). |
- |
25 March 2004 |
|
4 |
Photographs
of Silty Discharge from Stormwater Drains (17 March 2004) (Ref.
H2189/C1/5893/MP/CST/EY /ST/atm). |
- |
19 March 2004 |
|
5 |
Photographs
of Silty Discharge from Stormwater Drains (3, 6, 8 and 15 March 2004) (Ref.
H2189/C1/5893/MP/ CST/EY/ST/atm). |
- |
17 March 2004 |
|
3 |
Copies
of Marine Dumping Permits (EP/MD/04-133 & 134) for the dumping of
Contaminated Sediment at East of Sha Chau and Uncontaminated Sediment at
South of Cheung Chau (H2189/C1/5876/MP/CST/EY/ST/cm). |
- |
16 March 2004 |
|
4 |
Allocation
of Space for Disposal of Dredged Sediment (Ref. H2189/C1/5707/AT/CST/EY/ST/cm) |
- |
9 March 2004 |
|
5 |
Chemical
Spillage Drill Report (Ref. H2189/C1/5647/ MP/ST/cm) |
- |
3 March 2004 |
A summary of the Environmental Certification Sheet submissions to EPD for
the Month of March 2004 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. 7 - Feb 2004 |
3128/M45/200/OC5770/AC/al |
8 March
2004 |
- |
During the reporting period the following
environmental meetings were held:
·
17 March 2004 – a meeting was held between the
Contractor, ER, ET Team and IEC to discuss the Contractor's reclamation phasing
proposal and revised dredging volumes.
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 March 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 4, 11, 18 and
25 March 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
March 2004 is presented in Table 4-1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
1 March
2004 |
Mid Ebb |
15:43 - 18:18 |
|
Mid Flood |
07:56 - 10:36 |
|
|
3 March
2004 |
Mid Ebb |
09:32 - 12:18 |
|
Mid Flood |
15:52 - 18:37 |
|
|
5 March
2004 |
Mid Ebb |
10:22 - 12:51 |
|
Mid Flood |
15:53 - 18:18 |
|
|
8 March
2004 |
Mid Ebb |
12:44 - 15:24 |
|
Mid Flood |
07:45 - 10:48 |
|
|
10
March 2004 |
Mid Ebb |
12:38 - 15:21 |
|
Mid Flood |
07:31 - 10:36 |
|
|
12
March 2004 |
Mid Ebb |
14:28 - 16:53 |
|
Mid Flood |
08:18 - 11:04 |
|
|
15
March 2004 |
Mid Ebb |
15:14 - 17:56 |
|
Mid Flood |
07:24 - 10:44 |
|
|
17
March 2004 |
Mid Ebb |
09:12 - 11:50 |
|
Mid Flood |
13:44 - 16:30 |
|
|
19
March 2004 |
Mid Ebb |
10:27 - 12:57 |
|
Mid Flood |
15:25 - 17:47 |
|
|
22
March 2004 |
Mid Ebb |
12:29 - 15:34 |
|
Mid Flood |
07:42 - 10:42 |
|
|
24
March 2004 |
Mid Ebb |
12:43 - 15:01 |
|
Mid Flood |
07:36 - 10:20 |
|
|
26
March 2004 |
Mid Ebb |
13:34 - 16:05 |
|
Mid Flood |
07:34 - 10:38 |
|
|
Mid
Ebb |
15:31
- 17:56 |
|
|
Mid
Flood |
07:40
- 10:54 |
|
|
31 March 2004 |
Mid
Ebb |
15:13
- 17:47 |
|
Mid
Flood |
07:45
- 10:28 |
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 |
5.3 |
5.4 |
48.8 |
3.4 |
5 |
|
max |
7.2 |
8.1 |
97.2 |
17.5 |
10 |
|
|
avg |
6.2 |
6.3 |
80.9 |
6.5 |
7 |
|
|
sd |
5.3 |
5.4 |
48.8 |
3.4 |
5 |
|
|
C2 |
min |
5.6 |
6.0 |
68.0 |
2.3 |
4 |
|
max |
7.6 |
7.8 |
100.8 |
5.5 |
9 |
|
|
avg |
6.4 |
6.5 |
83.7 |
4.1 |
6 |
|
|
sd |
0.6 |
0.5 |
8.0 |
0.9 |
1 |
|
|
M7 |
min |
4.7 |
4.7 |
62.5 |
3.7 |
4 |
|
max |
7.2 |
8.5 |
99.1 |
6.7 |
9 |
|
|
avg |
5.7 |
5.7 |
75.7 |
4.8 |
6 |
|
|
sd |
0.6 |
0.9 |
8.6 |
1.0 |
1 |
|
|
M8 |
min |
5.2 |
5.3 |
66.1 |
3.0 |
4 |
|
max |
8.5 |
8.2 |
109.5 |
6.7 |
9 |
|
|
avg |
6.1 |
6.1 |
79.8 |
4.7 |
6 |
|
|
sd |
0.9 |
0.8 |
11.1 |
1.2 |
2 |
|
|
M9 |
min |
5.1 |
5.1 |
67.7 |
3.2 |
4 |
|
max |
6.9 |
8.0 |
93.9 |
7.2 |
10 |
|
|
avg |
5.9 |
5.9 |
78.0 |
4.9 |
7 |
|
|
sd |
0.6 |
0.8 |
7.8 |
1.3 |
2 |
|
|
M10 |
min |
5.3 |
5.1 |
70.2 |
2.6 |
4 |
|
max |
7.2 |
8.6 |
99.6 |
7.2 |
10 |
|
|
avg |
5.9 |
6.0 |
78.8 |
5.0 |
7 |
|
|
sd |
0.6 |
0.9 |
8.3 |
1.4 |
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 5.2 and 8.5
mg/L with an average value of 6.0 mg/L and DO measurements in the bottom layer
ranged from 5.1 to 8.6 mg/L with an average level of 6.1 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 5.3 to 7.6 mg/L with an average value of around 6.3
mg/L; DO measurements in the bottom layer ranged between 5.4 and 8.1 mg/L with
an average level of 6.4 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 10 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 |
5.1 |
5.1 |
69.0 |
3.2 |
5 |
|
max |
7.8 |
7.8 |
100.8 |
11.7 |
14 |
|
|
avg |
6.2 |
6.1 |
82.1 |
5.7 |
7 |
|
|
sd |
0.7 |
0.7 |
8.5 |
2.5 |
3 |
|
|
C2 |
min |
5.3 |
5.2 |
70.7 |
2.9 |
4 |
|
max |
7.4 |
8.3 |
99.2 |
5.2 |
8 |
|
|
avg |
6.3 |
6.4 |
83.7 |
4.0 |
6 |
|
|
sd |
0.5 |
0.7 |
6.8 |
0.8 |
2 |
|
|
M7 |
min |
4.8 |
4.9 |
65.8 |
2.8 |
4 |
|
max |
7.0 |
8.2 |
95.5 |
6.8 |
9 |
|
|
avg |
5.6 |
5.7 |
74.2 |
4.7 |
6 |
|
|
sd |
0.6 |
0.8 |
8.4 |
1.0 |
2 |
|
|
M8 |
min |
5.2 |
5.1 |
68.4 |
2.5 |
4 |
|
max |
7.8 |
9.1 |
106.0 |
5.7 |
8 |
|
|
avg |
6.0 |
6.1 |
79.7 |
4.3 |
6 |
|
|
sd |
0.7 |
1.0 |
9.6 |
1.0 |
2 |
|
|
M9 |
min |
5.1 |
5.1 |
68.3 |
3.4 |
4 |
|
max |
6.9 |
8.0 |
94.1 |
6.1 |
10 |
|
|
avg |
5.7 |
5.8 |
76.2 |
4.8 |
6 |
|
|
sd |
0.5 |
0.7 |
7.1 |
1.0 |
2 |
|
|
M10 |
min |
5.2 |
5.1 |
68.4 |
2.9 |
4 |
|
max |
8.1 |
8.1 |
104.2 |
7.0 |
9 |
|
|
avg |
6.1 |
6.0 |
79.9 |
4.6 |
6 |
|
|
sd |
0.7 |
0.8 |
8.5 |
1.3 |
1 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 5.1 to 8.1 mg/L with an
average level of 6.0 mg/L while DO values in the bottom layer ranged between
5.1 and 9.1 mg/L with an average of 6.1 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 5.1 and 7.8 mg/L
with an average value of 6.3 mg/L and DO results in the bottom layer ranged
from 5.1 and 8.3 mg/L with an average of 6.2 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 14 mg/L with an
average value of 7 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 month of December 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 |
59.3 |
4.8 |
6.1 |
|
max |
5.6 |
73.6 |
8.6 |
9.7 |
|
|
avg |
5.0 |
67.0 |
6.6 |
8.3 |
|
|
sd |
0.4 |
4.9 |
1.1 |
0.9 |
|
|
M2 |
min |
4.1 |
55.7 |
4.6 |
7.0 |
|
max |
5.8 |
77.3 |
8.6 |
15.3 |
|
|
avg |
4.9 |
65.5 |
6.4 |
10.6 |
|
|
sd |
0.5 |
6.1 |
1.3 |
2.3 |
|
|
M3 |
min |
4.4 |
59.8 |
3.7 |
5.5 |
|
max |
5.8 |
76.5 |
6.2 |
10.7 |
|
|
avg |
5.2 |
68.7 |
4.8 |
8.0 |
|
|
sd |
0.4 |
5.1 |
0.8 |
1.6 |
|
|
M4 |
min |
4.3 |
57.0 |
3.5 |
6.0 |
|
max |
6.2 |
81.4 |
7.7 |
13.3 |
|
|
avg |
5.2 |
68.2 |
5.1 |
8.7 |
|
|
sd |
0.5 |
6.4 |
1.0 |
2.0 |
|
|
M5 |
min |
4.4 |
58.6 |
2.7 |
5.0 |
|
max |
5.9 |
78.4 |
6.6 |
9.6 |
|
|
avg |
5.3 |
69.6 |
4.4 |
7.3 |
|
|
sd |
0.5 |
6.0 |
1.0 |
1.3 |
|
|
M6 |
min |
4.3 |
56.8 |
3.1 |
4.0 |
|
max |
5.3 |
69.8 |
5.9 |
11.7 |
|
|
avg |
4.9 |
65.3 |
4.5 |
7.4 |
|
|
sd |
0.3 |
4.2 |
1.0 |
1.9 |
|
|
M11 |
min |
4.8 |
63.6 |
4.0 |
6.0 |
|
max |
5.9 |
77.7 |
7.6 |
12.4 |
|
|
avg |
5.3 |
70.2 |
5.8 |
8.8 |
|
|
sd |
0.4 |
4.5 |
1.2 |
2.2 |
|
|
M12 |
min |
4.4 |
58.7 |
2.9 |
5.0 |
|
max |
5.4 |
71.9 |
6.0 |
11.7 |
|
|
avg |
5.1 |
66.8 |
4.5 |
7.5 |
|
|
sd |
0.3 |
4.0 |
1.0 |
2.0 |
|
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 station M5 on various occasions. Observations noted that the large patches of brown silty water generally dispersed westwards after discharge from the outfall. 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 |
4.5 |
59.9 |
5.0 |
5.5 |
|
max |
5.9 |
78.3 |
9.3 |
9.7 |
|
|
avg |
5.1 |
68.6 |
6.1 |
8.0 |
|
|
sd |
0.4 |
5.4 |
1.1 |
1.4 |
|
|
M2 |
min |
4.3 |
56.9 |
4.1 |
6.0 |
|
max |
5.5 |
73.4 |
7.7 |
12.3 |
|
|
avg |
5.0 |
66.5 |
5.7 |
9.1 |
|
|
sd |
0.4 |
4.9 |
1.1 |
1.6 |
|
|
M3 |
min |
4.3 |
56.1 |
3.5 |
5.0 |
|
max |
5.6 |
73.5 |
7.1 |
12.8 |
|
|
avg |
5.1 |
67.3 |
5.5 |
8.9 |
|
|
sd |
0.5 |
6.0 |
1.0 |
1.7 |
|
|
M4 |
min |
4.3 |
56.3 |
4.2 |
6.9 |
|
max |
6.0 |
79.6 |
7.4 |
15.5 |
|
|
avg |
5.2 |
69.3 |
5.5 |
8.5 |
|
|
sd |
0.4 |
5.7 |
0.9 |
2.3 |
|
|
M5 |
min |
4.5 |
58.8 |
3.1 |
5.4 |
|
max |
5.7 |
76.1 |
6.7 |
9.3 |
|
|
avg |
5.2 |
69.0 |
4.5 |
6.8 |
|
|
sd |
0.4 |
5.0 |
1.0 |
1.0 |
|
|
M6 |
min |
4.1 |
53.5 |
3.3 |
4.5 |
|
max |
5.4 |
72.8 |
6.5 |
9.5 |
|
|
avg |
4.9 |
64.9 |
5.0 |
7.5 |
|
|
sd |
0.4 |
5.9 |
1.0 |
1.5 |
|
|
M11 |
min |
5.0 |
65.8 |
3.0 |
5.0 |
|
max |
6.2 |
81.2 |
18.7 |
32.0 |
|
|
avg |
5.4 |
71.6 |
6.4 |
9.9 |
|
|
sd |
0.4 |
4.8 |
3.9 |
6.6 |
|
|
M12 |
min |
4.4 |
58.1 |
3.5 |
4.6 |
|
max |
5.5 |
73.3 |
7.0 |
8.8 |
|
|
avg |
5.0 |
66.3 |
4.8 |
6.9 |
|
|
sd |
0.3 |
4.4 |
1.1 |
1.3 |
|
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 station 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 several 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 26 and 31 March were due to
passer-by activity. On 27 March, a
demonstration was held outside the City Hall and the noise from the gathering
was particularly loud.
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. Additionally, it was noted that
no discernible noise above the ambient level from project works could be heard
during site visits.
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 generally similar to the
control stations.
The March 2004 monitoring results showed
occasional elevated concentrations of SS above the Action and/or Limit Level at
seawater intake stations.
Investigations into these monitoring results found that the SS levels
may be attributed to discharge influences from outfalls located in proximity of
seawater intake monitoring stations.
All of the high SS concentrations recorded were shown to be localised
conditions as no sediment plumes 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.
During the site inspection on 11 March 2004,
it was noted that the floating steel frame and silt curtain for the rockfilling
barge was found to be slightly submerged.
The Contractor subsequently repaired the steel frame. No dredging was conducted during the site
inspection on 25 March 2004 as the grab on the grab dredger was being repaired.
The construction works for Contract HK 16/03
were also inspected during the site inspections conducted during the reporting
month. No environmental non-conformance
was found for these works.
However, one complaint not attributable to
project works was received by EPD on 15 March 2004 regarding dark smoke being
emitted by a marine vessel near Queen's Pier.
An investigation found that the marine vessel in question might not be
one of the Contractor's marine plants as the area in front of Queen's Pier is
not the designed work area at this stage.
Additionally, since Queen's Pier is a public access area, observations
have noted that numerous external vessels berth there to alight passengers and
crew.
No environmental complaints
attributable to the project works were received during the reporting
period. Further, 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;
·
Marine piling at IRAW;
·
Erection of formworks at Pier No. 7;
·
Maintenance and necessary repairs to the seawater
intake silt screens.
The construction works scheduled in April
2004 include dredging at IRAE, demolition of the GPO walkway, 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 |
|
|
2 April 2004 |
10:53 |
15:54 |
|
5 April 2004 |
12:21 |
17:00 |
|
7 April 2004 |
08:30 |
14:00 |
|
9 April 2004 |
08:30 |
15:00 |
|
12 April 2004 |
08:30 |
17:00 |
|
14 April 2004 |
09:00 |
14:30 |
|
16 April 2004 |
10:49 |
16:14 |
|
19 April 2004 |
12:00 |
17:30 |
|
21 April 2004 |
12:00 |
17:30 |
|
23 April 2004 |
08:30 |
14:00 |
|
26 April 2004 |
08:30 |
16:22 |
|
28 April 2004 |
08:30 |
17:00 |
|
30 April 2004 |
09:00 |
14:30 |
|
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
were recorded. These levels were
investigated and have been 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.