|
Client |
Civil Engineering and Development Department |
||||
|
Project |
Supplementary Agreement No. 3 to Agreement No. CE
15/94 Design and Construction for the Minimum Option |
||||
|
Report
No. |
3128-REP-193-00 |
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|
Date of Issue |
10 December 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\3128\
Reports\0193.doc |
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|
Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 16 - November 2004 |
||||
|
|
Name |
Sign |
Date |
||
|
Prepared
by : |
Albert
Chan, ACL - Environmental Consultant |
|
10 Dec. 2004 |
||
|
Reviewed by : |
Susana
Bezy, ACL – ET Leader |
|
10 Dec. 2004 |
||
|
Authorised by : |
Jon
Varndell, ACL – Project Mgr |
|
10 Dec. 2004 |
||
|
|
|
|
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|
Distribution |
|
|
|||
|
Copy No |
Issue to |
Attention |
Corr. Ref. |
||
|
1 |
CEDD |
Mr
H H Yeung |
3128/M45/200/OC6722/al |
||
|
2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC6722/al |
||
|
4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC6722/al |
||
|
5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC6722/al |
||
|
6 |
CRIII Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC6722/al |
||
|
7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC6722/al |
||
|
8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC6722/al |
||
|
9 |
Office
Copy |
|
|
||
1. INTRODUCTION
1.1 Basic Project Information
2.1 Works Undertaken
2.2 Environmental Permits
2.3 Environmental
Document Submission
2.4 Environmental Meetings
2.5 Environmental Monitoring Locations
3.1 Summary of Impact EM&A Requirements
3.2 Environmental Quality Performance Limits
3.3 Event Action Plan
3.4 Implementation of Environmental Measures
4.1 Impact Monitoring
Schedule in November 2004
4.2 Monitoring Methodology
4.3 Monitoring Equipment
4.4 Impact Monitoring Results
5. Environmental
Complaint and Non-Compliance
5.1 Environmental Exceedances
5.2 Environmental
Complaint and Prosecution
5.3 Environmental
Enquiries
6.1 Key Works for the
Coming Month
6.2 Monitoring Schedules
for the Coming Months
6.3 Construction Programme
for the Next 3 Months
List of Annexes
Annex A Project Organisation / Contact Information
Annex B Contractor’s Work Programme
Annex C Location of Monitoring Stations & Outfalls
Annex D Environmental Quality Performance Limits for Air, Noise and Water Quality
Annex E Event and Action Plan for Air, Noise and Water Quality
Annex F Noise Monitoring Results
Annex G Graphical Representation of Noise Monitoring Results
Annex H Water Quality Monitoring Results
Annex I Graphical Representation of Water Quality Monitoring Results
Annex J Water Quality Exceedance Review
Annex K IEC Site Inspection Report
List of Tables
Table 2.1 - Summary of the Environmental License / Permit Status
Table 2.2 - Summary of the Contractor's Environmental Related Document
Submissions to the Engineer’s Representatives (ER).............................................................................................................................
Table 2.3 - Summary of Environmental Certification Sheet Submissions to
the Environmental Protection Department (EPD)...................................................................................................................................
Table 3.1 -
Summary of Impact EM&A Requirements
Table
4.1 - Water Quality Monitoring Programme (Seawater Intakes Stations)
Table
4.2 - Equipment for Air Quality Monitoring
Table
4.3 - Noise Monitoring Equipment
Table
4.4 - Equipment Used for Marine Water Quality Monitoring
Table
4.5 - Equipment Calibration Frequencies
Table
4.5 - Summary of Mid-Ebb Results for Marine-Based Stations
Table
4.6 - Summary of Mid-Flood Results for Marine-Based Stations
Table
4.7 - Summary of Mid-Ebb Results for Seawater Intake Stations
Table
4.8 - Summary of Mid-Flood Results for Seawater Intake Stations
Table 5.1 - Summary of Environmental Site Inspections
Table
6.1 - Water Quality Monitoring Programme
|
ACL |
Atkins China Limited |
|
CEDD |
Civil Engineering and Development Department |
|
CRIII |
Central Reclamation Phase III |
|
EIA |
Environmental Impact Assessment |
|
EIAO |
Environmental Impact Assessment Ordinance |
|
EM&A |
Environmental Monitoring and Audit |
|
EPD |
Environmental Protection Department |
|
ER |
Engineer’s Representatives |
|
ET |
Environmental Team |
|
IEC |
Independent Environmental Checker |
|
LCSD |
Leisure and Cultural Services Department |
|
LCSVO-JV |
Leighton China State Van Oord Joint Venture |
|
TDD |
Territory Development Department |
|
TSP |
Total Suspended Particulates |
|
WMP |
Waste Management Plan |
Executive
Summary
The Central Reclamation Phase III (CRIII)
Works, Contract No. HK 12/02, was awarded to Leighton China State Van Oord
Joint Venture (LCSVO-JV) by the Territory Development Department (now called
the Civil Engineering and Development Department (CEDD) after the merger of the
Civil Engineering Department and the Territory Development Department on 1 July
2004), Hong Kong Islands and Islands Development Office. The works under the Contract HK 12/02
commenced on 28 February 2003. Contract
HK 16/03 for the CRIII Hinterland Drainage Improvement Works was awarded to
Wang Kee Construction Co. Ltd. and works for this contract commenced on 17
December 2003.
Atkins China Limited (ACL) has been appointed by CEDD to implement the
Environmental Monitoring and Audit (EM&A) programme that was identified in
the EIA Report for the CRIII Project and is providing Environmental Team (ET)
services during the duration of the construction works.
This is the sixteenth 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 November 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 November 2004.
·
Noise monitoring was
performed continuously for 24 hours.
However, noise measurements are unavailable for the period between 24 November
and 28 November 2004 due to external renovation works at City Hall, which
caused power disruptions to the noise meter.
·
Water quality monitoring was
undertaken on the following days:
-
1 November 2004
-
3 November 2004
-
5 November 2004
-
8 November 2004
-
10 November 2004
-
12 November 2004
-
15 November 2004
-
17 November 2004
-
19 November 2004
-
22 November 2004
-
24 November 2004
-
26 November 2004
-
29 November 2004
Exceedance of Action and Limit Levels
There was no environmental air quality monitoring required during the
reporting period.
Noise quality exceedances were recorded on 19, 21, 22, 23, 29 and 30
November 2004. However, investigations
into these exceedances found that they were not due to the project works. The noise levels were attributable to
exterior renovation works being carried out for City Hall by external
contractors. Communications with the
building management for City Hall noted that the renovation works are expected
to continue until mid-December 2004.
Further, there are currently no project works located in the vicinity of
City Hall.
From the analysis of water quality monitoring results collected during
the reporting period, exceedances of
the Action and Limit Levels were found on several occasions. Although DO levels below the Action Level
were observed at seawater intake and marine-based 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 when the DO
Action and/or Limit Levels were exceeded at the marine-based stations the
control stations recorded similar DO levels.
Elevated concentrations of SS were recorded
on 1, 12, 15, 19, 24, 26 and 29 November 2004.
These exceedances were investigated and were found to be attributable to
poor ambient conditions and/or influences not related to project works. The investigations generally found no
significant gradient effects between those stations close to the project works
and those more remote to the works area.
Complaint Log
No environmental complaints were received during the 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 November 2004. A joint inspection was carried
out with the IEC on 18 November 2004.
Key Works for the Coming Month
Future key works are as follows:
·
Placing of rock fill and
temporary seawall construction at IRAW;
·
Sand filling work at IRAW;
·
In-situ work for the pumping
stations installed at IRAW;
·
Trimming to rock mound works
at IRAE;
·
Substructure works for the
CTB;
·
Superstructure and
architectural works for Pier No. 7;
·
Cooling watermains work; and
·
Maintenance and necessary
repair works for seawater intake silt screens.
The Main Works Contract HK 12/02 for CRIII commenced on 28th February
2003. Leighton-China State-Van Oord Joint Venture (LCSVO-JV) was awarded the
Contract No. HK 12/02 for the construction of the CRIII Engineering Works. Contract HK 16/03 for the CRIII Hinterland
Drainage Improvement Works was awarded to Wang Kee Construction Co. Ltd. and
works for this contract commenced on 17 December 2003.
Atkins China Limited (ACL) has been commissioned by TDD (now called
CEDD) to undertake the environmental monitoring and audit work for the project
in accordance with the Environmental Permit (EP No. EP-122/2002) issued to TDD
on 7 March 2002. The CRIII Project
Organisation is shown in Annex A.
This is the sixteenth monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 to 30 November 2004, inclusive.
The works undertaken during the reporting
month include obstruction clearing for marine piles, ballast to installed
caissons at IRAW, rock filling works behind installed caissons, seawall block
installations, placing of armour rock and levelling stone works, dredging,
surcharge material works, landside cooling watermains works, substructure works
for the Central Terminal Building (CTB) 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 |
Application for a Permit to Dump Material (Category M & H Sediment)
at Sea Under the Dumping at Sea Ordinance - ASMD Service Report for 21637V
(Ref. H2189/U2c/10550/ MP/EY/ST/ec) |
10
November 2004 |
- |
|
2 |
Application for Renewal of Construction Noise Permit (GW-TS0189-04) for
Grouting Works for Pre-bored H-pile (Ref. H2189/U2c/10459/MP/DC/CKA/ST/ec) |
8
November 2004 |
- |
|
3 |
LCSVO-JV submitted an Application for Renewal of Construction Noise
Permit (GW-TS03318-04) for Night-time works at Man Yiu Street (Ref.
H2189/U2c/10426/AT/ DC/ST/ec). |
3
November 2004 |
- |
A summary of the status of the submissions provided
during the reporting month is presented in Table 2.2.
|
Item |
Document
Title |
Version |
Date of
Submission to ER |
|
1 |
Advance
Notification of Night-time Construction Work at PLA (Ref.
H2189/C1/10693/MP/EY/DC/CKA/ST/atm) |
- |
22 November 2004 |
|
2 |
New
Construction Noise Permit GW-RS0549-04 (Ref. H2189/C1/10692/MP/EY/ST/atm) |
- |
22 November 2004 |
|
3 |
New
Construction Noise Permit GW-RS0541-04 (Ref. H2189/C1/10683/MP/EY/ST/ec) |
- |
20 November 2004 |
|
4 |
New
Marine Dumping Permits EP/MD/05-083 (Ref. H2189/C1/10609/MP/EY/ST/atm) |
- |
15 November 2004 |
|
5 |
New
Construction Noise Permit GW-RS0500-04 (Ref. |
- |
5 November 2004 |
A summary of the Environmental Certification Sheet submissions to EPD
during the reporting month is presented in Table 2.3.
|
No |
Certification
Subject |
Letter Ref. |
Date of
Submission to EPD |
Approved
Status |
|
1 |
Certification of Monthly Environmental Report
No. 15 - October 2004 |
3128/M45/200/OC6611/SB/
AC/al |
15
November 2004 |
- |
A brief environmental meeting was held with
the Contractor on 25 November 2004 to discuss the details of the proposed silt
curtain for sand filling works at IRAW.
The RE is currently reviewing other aspects of the sand filling
proposal.
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 has installed frame type silt curtains for rock filling
works to reduce SS dispersion. Further,
the Contractor carried out daily visual inspection of the silt screens for
seawater intakes. Floating debris in
the project area was collected at least once everyday and in the water body
near cooling water intakes debris was collected at least three times a
day. Bi-weekly diving inspections for
the silt screens were also carried out during the reporting month.
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 November 2004.
Air quality monitoring has not commenced
yet as no significant work areas or construction activities with the potential
to impact air quality are within range of the closest air quality sensitive
receivers (ASR).
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
November 2004 is presented in Table 4.1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
1 November 2004 |
Mid Ebb |
12:48 - 15:26 |
|
Mid Flood |
08:28 - 11:30 |
|
|
3 November 2004 |
Mid Ebb |
06:06 - 09:24 |
|
Mid Flood |
13:30 - 16:15 |
|
|
5 November 2004 |
Mid Ebb |
07:48 - 10:45 |
|
Mid Flood |
15:22 - 18:08 |
|
|
8 November 2004 |
Mid Ebb |
07:44 - 10:52 |
|
Mid Flood |
14:14 - 16:54 |
|
|
10 November 2004 |
Mid Ebb |
09:13 - 12:06 |
|
Mid Flood |
15:13 - 17:48 |
|
|
12 November 2004 |
Mid Ebb |
11:02 - 13:41 |
|
Mid Flood |
15:13 - 17:54 |
|
|
15 November 2004 |
Mid Ebb |
12:27 - 15:10 |
|
Mid Flood |
07:52 - 11:03 |
|
|
17 November 2004 |
Mid Ebb |
14:00 - 16:36 |
|
Mid Flood |
09:45 - 12:34 |
|
|
19 November 2004 |
Mid Ebb |
07:45 - 10:36 |
|
Mid Flood |
15:12 - 17:59 |
|
|
22 November 2004 |
Mid Ebb |
08:00 - 11:04 |
|
Mid Flood |
14:11 - 16:45 |
|
|
24 November 2004 |
Mid Ebb |
09:42 - 12:26 |
|
Mid Flood |
15:00 - 17:37 |
|
|
26 November 2004 |
Mid Ebb |
10:43 - 13:28 |
|
Mid Flood |
15:23 - 18:07 |
|
|
29 November 2004 |
Mid Ebb |
12:28 - 15:18 |
|
Mid Flood |
07:08 - 11:05 |
Air quality monitoring will be performed in
accordance with the methodology described in the EM&A Manual once
construction activities requiring air quality monitoring commence. The locations of the monitoring stations at
City Hall and PLA Headquarters are shown in Annex C.
Continuous 24-hour noise monitoring was performed
in accordance with the methodology described in the EM&A Manual in the
reporting period. The location of the noise monitoring station at City Hall is
shown in Annex C.
Water quality monitoring was performed in
accordance with the methodology described in the EM&A Manual. Monitoring for the reporting month was
conducted at all stations, which comprises of 6 marine-based stations and 8
seawater intake stations. The locations
of the monitoring stations are shown in Annex C.
The equipment that is used
for air quality monitoring is listed in Table 4.2.
|
Parameter Measured |
Equipment |
|
24-Hour Sampling |
High Volume Sampler Model
GS2310 by Anderson Instruments to be used for both monitoring stations. |
|
1-Hour Sampling |
MicroDust pro Aerosol
Monitoring System to be used for both monitoring locations. |
The equipment used for
continuous noise quality monitoring is listed in Table 4.3.
|
Equipment |
Model |
|
Integrated Sound Level Meter (SLM) |
B&K 2238 |
|
Calibrator |
B&K 4231, Class 1 |
The equipment that was used
for water quality monitoring is listed in Table 4.4.
|
Parameter Measured |
Equipment |
|
Dissolved Oxygen and Temperature Measuring Equipment |
A Dissolved Oxygen meter YSI model 58 was used. ·
This
instrument was portable and weatherproof and used a DC power source. The equipment was capable of measuring: ·
DO levels
in the range of 0-20 mg/l and 0-200% saturation; and ·
Temperature
of between 0 - 45 degree Celsius. ·
The
equipment had a membrane electrode with an automatic temperature compensation
complete with a cable. In addition, a Wirling Psychrometer was used as a
reference thermometer during the sampling. |
|
Turbidity Measurement Instrument |
|
|
PH |
A MP125 pH Meter from Mettler Toledo was used to measure pH. |
|
Salinity / Conductivity Meter |
A Salinity / Conductivity meter YSI model 63 and model 30 was used for determining salinity concentrations. |
|
Sample Containers and Storage |
Water samples for SS analysis were stored in high density polythene bottles with no preservative added, packed in ice and delivered to the laboratory, and analysed as soon as possible after collection. |
The calibration frequencies
of the monitoring equipment are provided in Table 4.5.
|
Equipment |
Calibration Frequency |
Latest Calibration Date |
|
Dissolved Oxygen Meter |
Every 6 months |
26 October 2004 |
|
Turbidimeter |
Every 3 months for
secondary standards; meter is calibrated prior to each measurement to the
secondary standards |
26 October 2004 |
|
pH Meter |
Prior to each sampling day |
- |
|
Pyschrometer |
Every 6 months |
5 October 2004 |
|
Integrated SLM |
Every year |
20 August 2004 |
No air quality monitoring work was undertaken
during the reporting period as no
significantly dusty construction activities with the potential to impact air
quality are within range of the closest air quality sensitive receivers.
Noise quality monitoring work was undertaken
during the reporting period. The noise
monitoring results are provided in Annex F. Graphical representation of the noise
monitoring data is provided in Annex G.
Water quality monitoring was undertaken at
all water quality monitoring locations during the reporting period. The water quality monitoring results from
this reporting period are presented in Annex H. Graphical representation of the water quality data is provided in
Annex
I. Summaries of the results are
provided in Tables 4.5 to 4.9.
Marine-Based Stations
Monitoring stations M8 and M10 were selected as the marine-based impact
stations as they are located outside the predicted influence of the dredging
and reclamation works. The detection of
water quality degradation at these two stations may indicate that project
marine works are adversely affecting water quality in Victoria Harbour. Stations M7 and M9 are within the expected
influence of the reclamation activities and are located along the works area
boundary (or extent of the predicted sediment plume). As such, M7 and M9 are used as indicator stations to note any
significant elevations in SS, turbidity or reductions in DO that may affect the
marine-based impact monitoring stations.
Table 4.5 is a summary of the marine-based stations
monitoring results during mid-ebb tide.
|
Station |
|
Parameter |
||||
|
DO (S&M) mg/L |
DO (B) mg/L |
DO % Sat. (DA) |
Turbidity (DA) NTU |
SS (DA) mg/L |
||
|
C1 |
min |
4.7 |
4.6 |
65 |
3.7 |
6 |
|
max |
5.5 |
5.2 |
76 |
7.3 |
9 |
|
|
avg |
5.1 |
4.9 |
71 |
5.4 |
7 |
|
|
sd |
0.2 |
0.2 |
3 |
1.1 |
1 |
|
|
C2 |
min |
4.7 |
4.7 |
65 |
3.6 |
4 |
|
max |
5.5 |
5.1 |
76 |
7.0 |
11 |
|
|
avg |
5.1 |
4.9 |
71 |
5.2 |
7 |
|
|
sd |
0.2 |
0.1 |
3 |
1.4 |
2 |
|
|
M7 |
min |
4.5 |
4.5 |
62 |
3.6 |
5 |
|
max |
5.6 |
5.2 |
78 |
9.5 |
10 |
|
|
avg |
4.9 |
4.8 |
69 |
5.4 |
7 |
|
|
sd |
0.3 |
0.2 |
4 |
1.6 |
2 |
|
|
M8 |
min |
4.5 |
4.3 |
63 |
3.9 |
5 |
|
max |
5.5 |
5.3 |
78 |
7.8 |
9 |
|
|
avg |
5.0 |
5.0 |
71 |
5.7 |
7 |
|
|
sd |
0.3 |
0.3 |
4 |
1.6 |
1 |
|
|
M9 |
min |
4.6 |
4.4 |
64 |
3.9 |
5 |
|
max |
5.4 |
5.1 |
76 |
10.2 |
11 |
|
|
avg |
4.9 |
4.8 |
69 |
5.7 |
8 |
|
|
sd |
0.2 |
0.2 |
3 |
1.8 |
2 |
|
|
M10 |
min |
4.6 |
4.6 |
64 |
3.7 |
5 |
|
max |
5.5 |
5.2 |
78 |
6.7 |
9 |
|
|
avg |
5.1 |
5.0 |
72 |
5.4 |
7 |
|
|
sd |
0.3 |
0.2 |
4 |
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 4.3 and 5.5 mg/L with an average value of 5.0 mg/L and DO measurements
in the bottom layer ranged from 4.3 to 5.3 mg/L with an average level of 5.0
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 4.7 to 5.5 mg/L with an average value of
around 5.1 mg/L; DO measurements in the bottom layer ranged between 4.6 and 5.2
mg/L with an average level of 4.9 mg/L.
SS levels during mid-ebb tide ranged from 5 to 9 mg/L with an average
value of 7 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 11 mg/L with an average of 7 mg/L.
Generally, 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 marine 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 generally not adversely affecting
water quality in Victoria Harbour.
Table 4.6 is a summary of monitoring results from
marine-based stations during mid-flood tide.
|
Station |
|
Parameter |
||||
|
DO (S&M) mg/L |
DO (B) mg/L |
DO % Sat. (DA) |
Turbidity (DA) NTU |
SS (DA) mg/L |
||
|
C1 |
min |
4.6 |
4.5 |
65 |
3.9 |
6 |
|
max |
5.8 |
5.1 |
80 |
7.3 |
9 |
|
|
avg |
5.1 |
4.9 |
72 |
5.8 |
7 |
|
|
sd |
0.3 |
0.2 |
4 |
1.2 |
1 |
|
|
C2 |
min |
4.7 |
4.6 |
65 |
3.5 |
5 |
|
max |
5.7 |
5.0 |
79 |
7.0 |
9 |
|
|
avg |
5.1 |
4.8 |
71 |
5.1 |
7 |
|
|
sd |
0.3 |
0.2 |
4 |
1.1 |
1 |
|
|
M7 |
min |
4.3 |
4.2 |
60 |
3.9 |
5 |
|
max |
5.5 |
5.4 |
79 |
8.5 |
9 |
|
|
avg |
4.8 |
4.7 |
68 |
5.9 |
7 |
|
|
sd |
0.3 |
0.3 |
5 |
1.3 |
1 |
|
|
M8 |
min |
4.7 |
4.6 |
65 |
3.8 |
5 |
|
max |
5.8 |
5.7 |
82 |
7.6 |
10 |
|
|
avg |
5.1 |
5.0 |
72 |
5.5 |
7 |
|
|
sd |
0.4 |
0.3 |
5 |
1.2 |
2 |
|
|
M9 |
min |
4.4 |
4.4 |
62 |
4.3 |
5 |
|
max |
5.7 |
5.4 |
80 |
7.8 |
9 |
|
|
avg |
4.9 |
4.8 |
69 |
5.9 |
7 |
|
|
sd |
0.3 |
0.3 |
5 |
1.2 |
1 |
|
|
M10 |
min |
4.7 |
4.6 |
65 |
3.8 |
6 |
|
max |
5.9 |
5.7 |
84 |
7.5 |
9 |
|
|
avg |
5.2 |
5.0 |
72 |
5.8 |
7 |
|
|
sd |
0.4 |
0.3 |
5 |
1.2 |
1 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 4.7 to 5.9 mg/L with an
average level of 5.1 mg/L while DO values in the bottom layer ranged between
4.6 and 5.7 mg/L with an average of 5.0 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 4.6 and 5.8 mg/L
with an average value of 5.1 mg/L and DO results in the bottom layer ranged
from 4.5 and 5.1 mg/L with an average of 4.9 mg/L.
SS content ranged between 5 and 10 mg/L (for stations M8 & M10) with
an average of 7 mg/L during mid-flood tide and ranged from 5 to 9 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 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 |
4.0 |
58 |
5.6 |
8 |
|
max |
6.0 |
85 |
10.1 |
12 |
|
|
avg |
4.6 |
65 |
7.5 |
9 |
|
|
sd |
0.5 |
7 |
1.5 |
1 |
|
|
M2 |
min |
3.6 |
51 |
5.2 |
8 |
|
max |
5.1 |
73 |
10.5 |
17 |
|
|
avg |
4.3 |
60 |
7.6 |
11 |
|
|
sd |
0.4 |
6 |
1.5 |
2 |
|
|
M3 |
min |
3.6 |
52 |
4.2 |
7 |
|
max |
4.9 |
70 |
11.0 |
13 |
|
|
avg |
4.2 |
60 |
6.9 |
10 |
|
|
sd |
0.4 |
6 |
2.1 |
2 |
|
|
M4 |
min |
4.0 |
59 |
4.0 |
6 |
|
max |
5.0 |
71 |
9.3 |
12 |
|
|
avg |
4.5 |
64 |
5.9 |
8 |
|
|
sd |
0.3 |
4 |
1.7 |
2 |
|
|
M5 |
min |
4.0 |
58 |
4.3 |
7 |
|
max |
5.4 |
77 |
9.1 |
11 |
|
|
avg |
4.6 |
66 |
6.4 |
9 |
|
|
sd |
0.4 |
6 |
1.4 |
1 |
|
|
M6 |
min |
3.8 |
55 |
3.8 |
7 |
|
max |
5.4 |
76 |
8.4 |
11 |
|
|
avg |
4.5 |
64 |
6.2 |
8 |
|
|
sd |
3.8 |
55 |
3.8 |
7 |
|
|
M11 |
min |
4.0 |
58 |
5.4 |
7 |
|
max |
5.3 |
75 |
9.7 |
12 |
|
|
avg |
4.5 |
65 |
7.5 |
9 |
|
|
sd |
0.4 |
5 |
1.5 |
1 |
|
|
M12 |
min |
4.0 |
57 |
4.3 |
6 |
|
max |
5.1 |
71 |
9.0 |
12 |
|
|
avg |
4.4 |
63 |
6.4 |
8 |
|
|
sd |
0.3 |
5 |
1.5 |
2 |
|
Seawater intake results during mid-ebb tide, Table 4.7, show that DO levels ranged from 3.6 to 6.0 mg/L with an average of 4.4 mg/L. SS ranged between 6 and 17 mg/L with an average value of 10 mg/L. Low DO levels at the intake stations were recorded during the reporting month but investigations found that they were not due to project works. Elevated SS levels were found on 1, 12 and 19 November 2004. These levels were investigated and it was found that they were generally due to ambient conditions and/or influences not related to project works.
Table 4.8 is a summary of monitoring results from seawater
intake stations during mid-flood tide.
|
Station |
|
Parameter |
|||
|
DO mg/L |
DO % Sat. |
Turbidity NTU |
SS mg/L |
||
|
M1 |
min |
3.9 |
54 |
5.1 |
7 |
|
max |
5.8 |
83 |
10.1 |
14 |
|
|
avg |
4.7 |
67 |
7.5 |
9 |
|
|
sd |
3.9 |
54 |
5.1 |
7 |
|
|
M2 |
min |
3.7 |
51 |
5.6 |
9 |
|
max |
5.7 |
80 |
10.1 |
14 |
|
|
avg |
4.3 |
61 |
7.9 |
12 |
|
|
sd |
0.6 |
8 |
1.2 |
2 |
|
|
M3 |
min |
3.8 |
51 |
4.8 |
8 |
|
max |
4.8 |
69 |
8.8 |
13 |
|
|
avg |
4.2 |
60 |
7.1 |
10 |
|
|
sd |
0.3 |
5 |
1.2 |
2 |
|
|
M4 |
min |
3.9 |
54 |
5.8 |
8 |
|
max |
5.3 |
74 |
9.3 |
15 |
|
|
avg |
4.5 |
64 |
7.2 |
11 |
|
|
sd |
0.4 |
6 |
1.0 |
2 |
|
|
M5 |
min |
3.8 |
55 |
4.8 |
7 |
|
max |
5.2 |
73 |
9.2 |
13 |
|
|
avg |
4.5 |
64 |
6.5 |
8 |
|
|
sd |
0.5 |
6 |
1.2 |
2 |
|
|
M6 |
min |
3.5 |
50 |
4.8 |
7 |
|
max |
5.6 |
79 |
8.2 |
13 |
|
|
avg |
4.5 |
64 |
6.5 |
9 |
|
|
sd |
0.5 |
7 |
1.2 |
2 |
|
|
M11 |
min |
4.1 |
57 |
4.8 |
6 |
|
max |
5.4 |
79 |
9.8 |
13 |
|
|
avg |
4.6 |
66 |
7.3 |
9 |
|
|
sd |
0.4 |
5 |
1.3 |
2 |
|
|
M12 |
min |
4.0 |
58 |
4.8 |
5 |
|
max |
5.3 |
73 |
8.4 |
12 |
|
|
avg |
4.6 |
65 |
6.5 |
9 |
|
|
sd |
0.3 |
4 |
1.0 |
2 |
|
During mid-flood survey, Table 4.8 shows that DO levels at seawater intake stations ranged from 3.5 to 5.8 mg/L with an average of 4.5 mg/L. SS ranged from 5 to 15 mg/L with an average SS content of 10 mg/L. The above results show that water quality during mid-flood tide was also generally good. Again, low DO levels were found but these were found to be not due to project works. The elevated SS levels found on 1, 12, 15, 24, 26 and 29 November 2004 were investigated and were found that to be generally due to ambient conditions and/or influences not related to project works.
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 major construction activities
undertaken during the reporting month were related to marine 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.
Noise quality exceedances were recorded on 19, 21, 22, 23, 29 and 30
November 2004. However, investigations
into these exceedances found that they were not due to the project works. The noise levels were attributable to
exterior renovation works being carried out for City Hall by external
contractors. Communications with the
building management for City Hall noted that the renovation works are expected
to continue until mid-December 2004.
Further, there are currently no project works located in the vicinity of
City Hall.
It should be noted that noise measurements are not available for the
period between 24 November and 28 November 2004 as the external power source
for the noise meter was disrupted due to the electrical and mechanical work
carried out at City Hall.
During the reporting period,
exceedances of the water quality criteria were generally found not to be caused
by the project works. Visual
observations of the harbour during the reporting month noted the presence of
floating debris throughout Victoria Harbour, including areas well beyond the
project site.
Elevated concentrations of SS were recorded
on 1, 12, 15, 19, 24, 26 and 29 November 2004.
These exceedances were investigated and were found to be attributable to
poor ambient conditions and/or influences not related to project works. The investigations generally found no
significant gradient effects between those stations close to the project works
and those more remote to the works area.
For example, station M12, which is located more than 1 km away from the
works area, would record SS levels that are similar to those found at stations
closer to the project works.
Additional SS monitoring was also conducted
at Queensway Government Offices (QGO) outfall and Culvert J during the
reporting month to observe the impacts from outfall discharges. For the exceedance recorded on 1 November
2004, additional SS monitoring results indicated that the SS level at Culvert J
was relatively high. As such, elevated
SS levels in the surrounding area (e.g. station M4) may have been significantly
influenced by the discharges.
Although DO levels below the Action and Limit
Levels were observed at the seawater intakes and marine-based stations, the 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 when the DO
Action and/or Limit Levels were exceeded at the marine-based stations the
control stations recorded similar DO levels.
Further, the results generally do not show any significant gradient
effect between stations close to the marine works and stations more remote to
the works area.
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 18 November 2004, and the IEC's site inspection report
is provided in Annex K.
A summary of the findings from the site
inspections conducted during the reporting month is provided in Table 5.1.
|
Date of
Inspection |
Observations |
Action(s) |
|
4
November 2004 |
No non-compliances found. |
N/A |
|
11
November 2004 |
Exposed soil surfaces at CR-10 appeared to
be dry. |
The Contractor was asked to spray the area
with water to avoid dusty emissions. |
|
A slightly yellowish silty discharge was
observed flowing from Culvert J. |
This discharge is from off-site and is not
project related. |
|
|
18
November 2004 |
Exposed soil surfaces at CR-10 appeared to
be dry. |
The Contractor was reminded again to spray
the area with water to avoid dusty emissions. |
|
A small gap was noticed in the silt
curtain used for rock filling works. |
The Contractor is reminded to properly
maintain the silt curtain. |
|
|
No significant sediment plumes were
observed at the works area. |
N/A |
|
|
25
November 2004 |
The hose connections to the sedimentation
tank at CR-10 were found to be leaky. |
The Contractor was asked to tighten or
repair the connections before continuing with sump pumping. |
|
One earth stockpile at CR-10 was not
entirely covered by impervious sheeting. |
The Contractor was asked to fully cover
all dusty stockpiles on site. |
|
|
No toilet facilities for workers were
found at CR-10. |
It was suggested that the Contractor
install additional toilet facilities at CR-10. |
|
|
No significant sediment plumes were
observed outside the works area.
However, yellowish water could be seen near the rock filing works
within the boundaries of IRAW. |
N/A |
No significant sediment plumes were observed
near the marine works during the site inspections.
No environmental complaints and no prosecution notices or summons were
received during the reporting month.
No environmental enquiries were received
during the reporting month.
The key issues to be considered in the coming
month include the following:
·
Placing of rock fill and
temporary seawall construction at IRAW;
·
Sand filling works at IRAW;
·
In-situ work for the pumping
stations installed at IRAW;
·
Trimming to rock mound works
at IRAE;
·
Substructure works for the
CTB;
·
Superstructure and
architectural works for Pier No. 7;
·
Cooling watermains work; and
·
Maintenance and necessary
repair works for seawater intake silt screens.
Based on the Contractor’s programme, the
Environmental Monitoring Programme for the next three months is planned as
follows:
TSP (24 hr and 1 hr monitoring)
Upon commencement of significant dust generating
activities within range of the closest air quality sensitive receiver,
dependent upon the Contractor’s programme.
Noise
(Continuous Measurements)
The noise monitoring programme throughout the
entire construction period is 24-hour continuous.
Water Quality Monitoring
The water quality monitoring schedule for the
upcoming months is provided in the following table.
|
Date of Sampling |
Sampling Time |
|
|
1 December 2004 |
09:00 |
14:37 |
|
3 December 2004 |
08:00 |
15:48 |
|
6 December 2004 |
08:30 |
14:21 |
|
8 December 2004 |
08:57 |
15:14 |
|
10 December 2004 |
10:47 |
16:14 |
|
13 December 2004 |
08:30 |
14:00 |
|
15 December 2004 |
09:51 |
14:45 |
|
17 December 2004 |
11:41 |
16:52 |
|
20 December 2004 |
08:30 |
14:04 |
|
22 December 2004 |
09:11 |
15:15 |
|
24 December 2004 |
10:52 |
16:08 |
|
27 December 2004 |
12:00 |
17:00 |
|
29 December 2004 |
09:00 |
14:00 |
|
31 December 2004 |
10:00 |
15:00 |
|
3 January 2005 |
12:00 |
17:00 |
|
5 January 2005 |
08:30 |
13:29 |
|
7 January 2005 |
09:30 |
14:45 |
|
10 January 2005 |
12:00 |
17:00 |
|
12 January 2005 |
08:45 |
13:57 |
|
14 January 2005 |
10:08 |
15:34 |
|
17 January 2005 |
12:00 |
17:00 |
|
19 January 2005 |
08:30 |
13:30 |
|
21 January 2005 |
10:26 |
17:30 |
|
24 January 2005 |
11:52 |
16:41 |
|
26 January 2005 |
08:30 |
13:30 |
|
28 January 2005 |
08:49 |
14:05 |
|
31 January 2005 |
10:19 |
16:09 |
|
2 February 2005 |
11:28 |
17:00 |
|
4 February 2005 |
08:30 |
13:30 |
|
7 February 2005 |
11:27 |
16:13 |
|
14 February 2005 |
10:16 |
16:31 |
|
16 February 2005 |
11:31 |
18:57 |
|
18 February 2005 |
09:08 |
17:30 |
|
21 February 2005 |
11:14 |
15:53 |
|
23 February 2005 |
12:00 |
17:00 |
|
25 February 2005 |
08:30 |
13:30 |
|
28 February 2005 |
08:52 |
14:53 |
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,
exceedances of the water quality criteria occurred and most were found not to
be caused by the project works. The
ambient water quality throughout Hong Kong waters was found to be relatively
poor, with low DO levels and relatively high SS concentrations being recorded
at the control stations on several occasions.
Visual observations of the harbour during the reporting month noted that
the water throughout Victoria Harbour contained numerous amounts of floating
debris, which are not originated from the project.
Low DO levels have been
recorded at seawater intake and marine-based stations. However, investigations into the DO
exceedances found that the low levels were not due to project works as
marine-based stations and control stations recorded similar levels. Near-shore influences not related to project
works might have affected DO concentrations at the seawater intake stations.
Elevated SS levels were
recorded on several occasions during the month of November 2004. Investigations into these exceedances found
that they were attributed to ambient conditions and/or influences not related
to project works. The results generally
did not show any significant gradient effects between stations located near the
works and stations located farther away from the works.
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.