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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-160-00 |
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Date of Issue |
5 January 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\3128\ Reports\0160.doc |
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Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 5 - December2003 |
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Name |
Sign |
Date |
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Prepared
by : |
Albert Chan,
ACL - Environmental Consultant |
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5
Jan. 2004 |
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Reviewed by : |
Susana
Bezy, ACL – ET Leader |
|
5
Jan. 2004 |
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Authorised by : |
Jon
Varndell, ACL – Project Mgr |
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5
Jan. 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/OC5618/al |
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|
2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC5618/al |
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4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC5618/al |
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5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC5618/al |
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6 |
CRIII
Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC5618/al |
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7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC5618/al |
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8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC5618/al |
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9 |
Office
Copy |
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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 EPD Water Quality Monitoring Data
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................................................................... 9
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...................................................................... 24
|
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.
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 fifth 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 December to 31 December 2003.
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,
10, 18, 24 and 31 December 2003.
·
Noise monitoring was performed continuously
for 24 hours.
·
Water quality monitoring was undertaken on the
following days:
-
1 December 2003
-
3 December 2003
-
5 December 2003
-
8 December 2003
-
10 December 2003
-
12 December 2003
-
15 December 2003
-
17 December 2003
-
19 December 2003
-
22 December 2003
-
24 December 2003
-
26 December 2003
-
29 December 2003
-
31 December 2003
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 a few 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, 10, 18, 24 and 31 December 2003. Deficiencies were recorded
during site inspections carried out on 4 and 9 December 2003. The Contractor was immediately notified and
subsequently rectified the deficiencies.
Future Key Issues
Future Key Issues are as follows:
·
Following the Contractor's proposal for an
alternate dredging at IRAE during the daytime and at IRAW during the nighttime,
a water quality monitoring programme was conducted for the alternate dredging
trial at IRAW and IRAE between 3 and 13 December 2003. The monitoring programme, which was divided
into a pre-alternate dredging trial phase and an alternated dredging trial phase,
did not find any significant additional impacts to water quality attributable
to the alternate dredging works. The ET
Leader and IEC provided a certification of the alternate dredging at IRAW and
IRAE on 19 December 2003 based on the results of the monitoring programme. The Contractor commenced alternate dredging
at IRAW and IRAE on 22 December 2003 and an operational monitoring programme
was implemented for the continued monitoring of the alternate dredging works.
·
Dredging work at IRAE is still being limited to an
area outside the 100 m Exclusion Zone around the Heliport. The delays to the relocation of the Heliport
may delay the dredging in this zone.
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. 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 temporary traffic diversion work at Lung Wui Road.
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 fifth monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 December to 31 December 2003, inclusive.
The works undertaken during the reporting
month were limited to dredging, rockfilling up to the original seabed level
only, marine site investigation for the Eastern Seawall, maintenance and
necessary repair work for seawater intake silt screens, demolition preparation
work for the GPO Walkway and minor demolition works at Pier No. 7.
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
Permit to Dump Material (Contaminated Sediment) at Sea Under the Dumping at
Sea Ordinance (Ref. H2189/U2c/4784/MP/CST/EY/ ST/cm). |
29
December 2003 |
- |
|
2 |
LCSVO-JV submitted an
Application for Construction Noise Permit for the purpose of carrying out
construction work near Man Yiu Street and Culvert F in Central. |
24
December 2003 |
- |
|
3 |
LCSVO-JV submitted a
notification for the surrender of existing Construction Noise Permit No.
GW-TS0392-03 effective on 13 December 2003 (Ref. H2189/U2c/4604/
MP/CST/EY/ST/cm). |
13
December 2003 |
- |
|
4 |
LCSVO-JV submitted a
Waste Water Discharge Licence Application (Ref. H2189/U2c/4521/MP/ATA/CKA/ST/
cm) under the Water Pollution Control Ordinance that supersedes the
application submitted on 31 July 2003 (Ref H2189/U2c/2189/MP/ATA/ST/ec). |
9
December 2003 |
- |
|
5 |
LCSVO-JV submitted an
Application for Construction Noise Permit Renewal of CNP No. GW-TS0264-03
(Ref. H2189/ U2c/4490/MP/CST/EY/ST/cm) for the use of Powered Mechanical
Equipment (PME) for the purpose of carrying out construction work other than
percussive piling. |
6
December 2003 |
- |
|
6 |
LCSVO-JV submitted an
Application for Construction Noise Permit (Ref. H2189/U2c/4461/
MP/ATA/CKA/ST/cm) for the Dismantling of Metal Framework Supporting Link
Bridge of General Post Office (CNP No. GW-TS0560-03) |
4
December 2003 |
19
December 2003 |
|
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 |
Photographs
of Silty Discharge from Stormwater Drains (15 - 20 December 2003) |
- |
22 December 2003 |
|
2 |
Photographs
of Silty Discharge from Stormwater Drains (18 & 19 December 2003) |
- |
19 December 2003 |
|
3 |
Data
Plots and Statistical Results for Alternate Dredging Trial Monitoring
Programme at IRAW & IRAE |
- |
17 December 2003 |
|
4 |
Photographs
of Silty Discharge from Stormwater Drains (10, 12 & 13 December 2003) |
- |
13 December 2003 |
|
5 |
Submission
of Impact Monitoring Data for (12
December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
13 December 2003 |
|
6 |
Submission
of Impact Monitoring Data for (11
December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
12 December 2003 |
|
7 |
Submission
of Impact Monitoring Data for (10
December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
11 December 2003 |
|
8 |
Submission
of Impact Monitoring Data for (9
December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
11 December 2003 |
|
9 |
Submission
of Impact Monitoring Data for (8
December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
10 December 2003 |
|
10 |
Submission
of Impact Monitoring Data for (5
& 6 December 2003) for Alternate Dredging (Trial) at IRAW & IRAE |
- |
9 December 2003 |
|
11 |
Photographs
of Silty Discharge from Stormwater Drains (4, 5 & 8 December 2003) |
- |
9 December 2003 |
|
12 |
Submission
of Baseline Data for Alternate Dredging Monitoring (Pre-Alternate Dredging) |
- |
6 December 2003 |
|
13 |
Photographs
of Silty Discharge from Stormwater Drains (27 - 29 November 2003) |
- |
1 December 2003 |
A summary of the Environmental Certification Sheet submissions to EPD
for the Month of December 2003 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. 4 - November 2003 |
3128/M45/200/OC5521/Ac/al |
8
December 2003 |
- |
No environmental meetings were held during the reporting period.
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 December 2003. 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, 10, 18, 24 and 31 December 2003.
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 report
period.
Impact water quality monitoring at all
monitoring stations was undertaken during this reporting month. The water quality monitoring schedule for
December 2003 is presented in Table 4-1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
1
December 2003 |
Mid Ebb |
07:27 - 10:54 |
|
Mid Flood |
12:27 - 15:06 |
|
|
3
December 2003 |
Mid Ebb |
07:28 - 10:49 |
|
Mid Flood |
13:07 - 16:16 |
|
|
5
December 2003 |
Mid Ebb |
09:02 - 12:42 |
|
Mid Flood |
14:32 - 17:14 |
|
|
8
December 2003 |
Mid Ebb |
10:13 - 13:12 |
|
Mid Flood |
15:24 - 18:10 |
|
|
10
December 2003 |
Mid Ebb |
10:32 - 13:07 |
|
Mid Flood |
15:54 - 18:30 |
|
|
12
December 2003 |
Mid Ebb |
13:03 - 15:45 |
|
Mid Flood |
08:13 - 11:25 |
|
|
15
December 2003 |
Mid Ebb |
07:11 - 09:50 |
|
Mid Flood |
14:37 - 17:15 |
|
|
17
December 2003 |
Mid Ebb |
16:04 - 18:49 |
|
Mid Flood |
10:48 - 13:54 |
|
|
19
December 2003 |
Mid Ebb |
07:40 - 10:45 |
|
Mid Flood |
13:02 - 15:37 |
|
|
22
December 2003 |
Mid Ebb |
09:50 - 12:34 |
|
Mid Flood |
14:45 - 17:13 |
|
|
24
December 2003 |
Mid Ebb |
11:44 - 14:11 |
|
Mid Flood |
06:38 - 09:11 |
|
|
26
December 2003 |
Mid Ebb |
13:21 - 17:36 |
|
Mid Flood |
07:23 - 10:47 |
|
|
29
December 2003 |
Mid Ebb |
15:28 - 18:09 |
|
Mid Flood |
10:56 - 13:40 |
|
|
31
December 2003 |
Mid Ebb |
07:42 - 10:36 |
|
Mid Flood |
12:28 - 15:16 |
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 |
5.7 |
5.5 |
78.7 |
3.3 |
5 |
|
Max |
7.2 |
7.0 |
92.6 |
6.6 |
8 |
|
|
Avg |
6.4 |
6.2 |
84.3 |
4.8 |
6 |
|
|
Sd |
0.4 |
0.5 |
4.5 |
1.2 |
1 |
|
|
C2 |
Min |
4.8 |
4.6 |
65.7 |
2.9 |
5 |
|
Max |
7.3 |
7.2 |
92.2 |
5.3 |
8 |
|
|
Avg |
6.2 |
6.0 |
81.4 |
4.2 |
6 |
|
|
sd |
0.7 |
0.7 |
8.0 |
0.7 |
1 |
|
|
M7 |
min |
4.9 |
4.9 |
67.8 |
3.1 |
4 |
|
max |
7.1 |
7.1 |
90.7 |
6.1 |
8 |
|
|
avg |
5.9 |
5.9 |
78.4 |
4.3 |
6 |
|
|
sd |
0.6 |
0.5 |
6.2 |
1.0 |
1 |
|
|
M8 |
min |
5.0 |
4.9 |
68.8 |
3.2 |
4 |
|
max |
7.0 |
7.4 |
92.7 |
6.1 |
7 |
|
|
avg |
6.1 |
6.1 |
81.8 |
4.5 |
6 |
|
|
sd |
0.6 |
0.7 |
7.7 |
0.8 |
1 |
|
|
M9 |
min |
5.1 |
5.1 |
71.0 |
3.2 |
5 |
|
max |
7.2 |
7.0 |
90.6 |
6.1 |
8 |
|
|
avg |
5.9 |
6.0 |
79.5 |
4.5 |
6 |
|
|
sd |
0.5 |
0.5 |
5.5 |
0.9 |
1 |
|
|
M10 |
min |
5.2 |
5.1 |
71.6 |
3.5 |
5 |
|
max |
7.3 |
7.2 |
92.1 |
6.4 |
9 |
|
|
avg |
6.1 |
6.1 |
81.4 |
4.8 |
6 |
|
|
sd |
0.5 |
0.5 |
5.8 |
1.1 |
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 5.0 and 7.3
mg/L with an average value of 6.1 mg/L and DO measurements in the bottom layer
ranged from 4.9 to 7.4 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 4.8 to 7.3 mg/L with an average value of around 6.3
mg/L; DO measurements in the bottom layer ranged between 4.6 and 7.2 mg/L with
an average level of 6.1 mg/L.
SS levels during mid-ebb tide ranged from 4 to 9 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
5 to 8 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 |
5.8 |
5.7 |
78.7 |
2.9 |
4 |
|
max |
7.3 |
6.8 |
92.2 |
7.7 |
8 |
|
|
avg |
6.4 |
6.1 |
84.2 |
4.8 |
6 |
|
|
sd |
0.4 |
0.4 |
3.9 |
1.3 |
1 |
|
|
C2 |
min |
4.9 |
4.6 |
66.5 |
2.9 |
4 |
|
max |
7.2 |
7.0 |
94.1 |
6.1 |
9 |
|
|
avg |
6.2 |
6.0 |
81.2 |
4.6 |
6 |
|
|
sd |
0.7 |
0.7 |
8.2 |
0.9 |
1 |
|
|
M7 |
min |
4.4 |
4.5 |
62.1 |
2.9 |
4 |
|
max |
7.2 |
6.9 |
90.6 |
6.4 |
8 |
|
|
avg |
5.7 |
5.6 |
75.6 |
4.8 |
6 |
|
|
sd |
0.7 |
0.6 |
7.9 |
1.1 |
1 |
|
|
M8 |
min |
4.8 |
4.8 |
66.7 |
3.3 |
4 |
|
max |
7.2 |
7.5 |
93.1 |
6.2 |
9 |
|
|
avg |
6.0 |
6.0 |
80.3 |
4.6 |
6 |
|
|
sd |
0.7 |
0.7 |
8.4 |
0.9 |
1 |
|
|
M9 |
min |
4.8 |
4.8 |
67.9 |
3.5 |
5 |
|
max |
7.3 |
7.2 |
92.6 |
8.1 |
10 |
|
|
avg |
5.8 |
5.7 |
77.5 |
4.8 |
6 |
|
|
sd |
0.6 |
0.6 |
6.6 |
1.3 |
1 |
|
|
M10 |
min |
4.8 |
4.8 |
66.9 |
3.7 |
5 |
|
max |
7.0 |
7.3 |
90.9 |
8.1 |
8 |
|
|
avg |
6.0 |
5.9 |
79.7 |
5.3 |
7 |
|
|
sd |
0.6 |
0.7 |
7.1 |
1.1 |
1 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 4.8 to 7.5 mg/L with an
average level of 6.0 mg/L while DO values in the bottom layer ranged between
4.8 and 7.5 mg/L with an average of 6.0 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 4.9 and 7.3 mg/L
with an average value of 6.3 mg/L and DO results in the bottom layer ranged
from 4.6 and 7.0 mg/L with an average of 6.1 mg/L.
SS content ranged between 4 and 9 mg/L (for stations M8 & M10) with
an average of 7 mg/L during mid-flood tide and ranged from 4 to 9 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 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 |
61.1 |
4.1 |
5 |
|
max |
6.3 |
82.8 |
9.2 |
14 |
|
|
avg |
5.3 |
71.1 |
6.5 |
8 |
|
|
sd |
0.5 |
5.9 |
1.6 |
2 |
|
|
M2 |
min |
4.2 |
58.7 |
3.9 |
6 |
|
max |
5.9 |
78.4 |
7.3 |
12 |
|
|
avg |
5.2 |
69.3 |
5.2 |
9 |
|
|
sd |
0.5 |
6.5 |
1.0 |
2 |
|
|
M3 |
min |
4.2 |
57.8 |
3.8 |
6 |
|
max |
6.1 |
79.7 |
7.3 |
14 |
|
|
avg |
5.3 |
70.3 |
5.0 |
9 |
|
|
sd |
0.6 |
7.3 |
1.1 |
2 |
|
|
M4 |
min |
4.4 |
57.9 |
3.0 |
5 |
|
max |
6.4 |
83.6 |
6.8 |
12 |
|
|
avg |
5.3 |
70.4 |
4.6 |
8 |
|
|
sd |
0.6 |
7.0 |
1.3 |
2 |
|
|
M5 |
min |
4.6 |
62.2 |
2.7 |
5 |
|
max |
6.2 |
81.5 |
8.2 |
11 |
|
|
avg |
5.4 |
72.3 |
4.9 |
8 |
|
|
sd |
0.5 |
5.7 |
1.4 |
2 |
|
|
M6 |
min |
4.1 |
55.2 |
3.3 |
5 |
|
max |
5.9 |
77.0 |
11.8 |
21 |
|
|
avg |
5.1 |
67.7 |
5.5 |
9 |
|
|
sd |
0.6 |
6.7 |
2.1 |
4 |
|
|
M11 |
min |
4.2 |
58.1 |
3.2 |
5 |
|
max |
6.0 |
80.2 |
8.3 |
8 |
|
|
avg |
5.3 |
70.6 |
5.0 |
7 |
|
|
sd |
0.6 |
6.5 |
1.6 |
1 |
|
|
M12 |
min |
4.1 |
55.8 |
3.2 |
5 |
|
max |
6.0 |
77.9 |
5.9 |
9 |
|
|
avg |
5.0 |
67.4 |
4.7 |
7 |
|
|
sd |
0.6 |
7.5 |
0.9 |
1 |
|
Seawater intake results during mid-ebb tide, Table 4.7, show that DO levels ranged from 4.1 to 6.4 mg/L with an average of 5.2 mg/L. SS ranged between 5 and 21 mg/L with an average value of 8.1 mg/L. The monitoring results show that water quality at seawater intake stations was generally good. Only a few low DO levels and elevated SS levels, such as at station M6, were found during the reporting month. The poor water quality at M6 is also due to adverse impacts from outfalls located adjacent to the station. During the reporting month large quantities of 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 |
4.2 |
58.5 |
3.9 |
6 |
|
max |
6.0 |
78.9 |
11.2 |
12 |
|
|
avg |
5.2 |
70.3 |
6.8 |
9 |
|
|
sd |
0.6 |
7.9 |
2.3 |
1 |
|
|
M2 |
min |
4.2 |
58.5 |
4.3 |
6 |
|
max |
5.9 |
78.3 |
7.6 |
12 |
|
|
avg |
5.2 |
70.3 |
5.7 |
8 |
|
|
sd |
0.6 |
6.5 |
1.0 |
2 |
|
|
M3 |
min |
4.1 |
56.2 |
4.2 |
7 |
|
max |
5.9 |
79.4 |
9.3 |
15 |
|
|
avg |
5.2 |
70.0 |
5.9 |
10 |
|
|
sd |
0.7 |
7.8 |
1.4 |
3 |
|
|
M4 |
min |
4.3 |
58.8 |
2.9 |
4 |
|
max |
6.1 |
80.0 |
7.6 |
10 |
|
|
avg |
5.4 |
72.1 |
4.9 |
7 |
|
|
sd |
0.5 |
6.2 |
1.2 |
1 |
|
|
M5 |
min |
4.6 |
61.7 |
3.2 |
3 |
|
max |
5.9 |
79.0 |
9.0 |
10 |
|
|
avg |
5.4 |
72.0 |
4.6 |
6 |
|
|
sd |
0.5 |
6.2 |
1.4 |
2 |
|
|
M6 |
min |
4.2 |
57.2 |
3.8 |
4 |
|
max |
5.7 |
76.4 |
7.9 |
9 |
|
|
avg |
5.1 |
67.5 |
4.6 |
7 |
|
|
sd |
0.5 |
6.2 |
1.1 |
1 |
|
|
M11 |
min |
4.5 |
61.7 |
3.8 |
5 |
|
max |
6.1 |
81.1 |
6.3 |
10 |
|
|
avg |
5.4 |
72.7 |
5.1 |
8 |
|
|
sd |
0.6 |
7.0 |
0.9 |
1 |
|
|
M12 |
min |
4.2 |
58.0 |
3.3 |
4 |
|
max |
5.6 |
75.0 |
9.1 |
14 |
|
|
avg |
5.1 |
68.1 |
5.3 |
8 |
|
|
sd |
0.5 |
6.1 |
1.6 |
3 |
|
During
mid-flood survey, Table 4.8 shows that DO levels at seawater intake stations
ranged from 4.1 to 6.1 mg/L with an average of 5.3 mg/L. SS ranged from 3 to 15 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 low DO levels and 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. 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.
A waste management audit was conducted on 18 December
2003 during this reporting period to check the Contractor's conformity with
their updated Waste Management Plan (WMP) issued on 27 November 2003. The audit did not find any non-conformity
with the Contractor's WMP.
As the works undertaken during the reporting
month were related to site investigation works, minor 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 were observed
during the reporting period.
A few DO levels were found to have exceeded
the Action Level at seawater intake stations during the reporting month. Investigations found that they were due to
natural variation or changes in ambient conditions and not caused the project
marine works. Annex J provides a
summary of the exceedances. 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 and the ambient level of DO was generally
above 4.7 mg/L.
The December 2003 monitoring results also
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. A joint site environmental
inspection with the IEC was conducted on 10 December 2003.
One deficiency was found during an
environmental site inspection conducted on 4 December 2003. The deficiency had to deal with a small
damaged section of the silt curtain surrounding the grab dredger. Dredging works were temporarily stopped
while the damaged geo-textile section was replaced.
During a site inspection carried out by site
staff on 9 December 2003, a yellowish plume was seen near the grab dredger at
15:00. The Contractor was immediately
notified of the appearance of the plume and they stopped all dredging
activities to investigate the cause of the plume upon receipt of the
notification. It was noted that the
yellowish plume disappeared 30 minutes after dredging was stopped. Dredging resumed after the investigation did
not find any anomalies with the dredging works. Another site observation was made at 15:30 and no other plumes
around the dredger or hopper barge were detected after the dredging
recommenced. The EM&A water quality
monitoring conducted the following day (10 December 2003) did not find any
exceedances.
No environmental complaints 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:
·
It is anticipated that the Contractor will
undertake alternate dredging at IRAW and IRAE after their proposal was accepted
during this reporting period. An
operational water quality monitoring programme is to be carried out for the
duration of the alternate dredging works to check for any additional impacts to
water quality;
·
Maintenance and necessary repairs to the seawater
intake silt screens will continue.
The construction works scheduled in January
2004 include dredging at IRAE and IRAW, marine site investigation for the
Eastern Seawall and site investigation 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 January 2004 |
08:30 |
14:33 |
|
5 January 2004 |
10:30 |
16:00 |
|
7 January 2004 |
11:30 |
17:00 |
|
9 January 2004 |
08:30 |
14:00 |
|
12 January 2004 |
10:00 |
15:30 |
|
14 January 2004 |
11:39 |
17:25 |
|
16 January 2004 |
08:30 |
14:00 |
|
19 January 2004 |
10:00 |
15:30 |
|
21 January 2004 |
12:00 |
17:30 |
|
24 January 2004 |
09:00 |
14:30 |
|
26 January 2004 |
10:14 |
15:52 |
|
28 January 2004 |
11:25 |
17:00 |
|
30 January 2004 |
12:00 |
17:30 |
|
2 February 2004 |
10:18 |
17:00 |
|
4 February 2004 |
11:00 |
16:30 |
|
6 February 2004 |
12:00 |
17:30 |
|
9 February 2004 |
08:48 |
14:21 |
|
11 February 2004 |
09:52 |
15:48 |
|
13 February 2004 |
11:05 |
17:00 |
|
16 February 2004 |
09:15 |
17:00 |
|
18 February 2004 |
11:00 |
16:30 |
|
20 February 2004 |
12:00 |
17:30 |
|
23 February 2004 |
08:43 |
14:32 |
|
25 February 2004 |
09:30 |
15:40 |
|
27 February 2004 |
10:14 |
17:00 |
|
1 March 2004 |
08:47 |
17:00 |
|
3 March 2004 |
10:24 |
17:00 |
|
5 March 2004 |
11:30 |
17:00 |
|
8 March 2004 |
08:30 |
14:00 |
|
10 March 2004 |
08:33 |
14:38 |
|
12 March 2004 |
09:33 |
16:06 |
|
15 March 2004 |
08:30 |
17:00 |
|
17 March 2004 |
10:00 |
15:30 |
|
19 March 2004 |
11:49 |
17:00 |
|
22 March 2004 |
08:30 |
14:00 |
|
24 March 2004 |
08:30 |
14:27 |
|
26 March 2004 |
08:33 |
15:22 |
|
29 March 2004 |
08:30 |
17:00 |
|
31 March 2004 |
08:53 |
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 low DO levels and 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.
One deficiency and one major
site observation were noted on site inspections during the 0reporting
period. The Contractor subsequently
rectified the deficiency and made appropriate investigations after being
notified.
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.