Central
Reclamation, Phase III
Environmental Monitoring
& Audit
Monthly Report No. 14
September 2004
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Client |
Civil Engineering and Development Department |
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Project |
Supplementary Agreement No. 3 to Agreement No. CE 15/94 Design and Construction for the Minimum Option |
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Report
No. |
3128-REP-187-00 |
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Date of Issue |
8 October 2004 |
File
Ref. L:\S-proj\CR3\CR3.NEW\3128\
Reports\0187.doc |
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Report Title |
Central
Reclamation, Phase III Environmental
Monitoring & Audit Monthly
Report No. 14 - September 2004 |
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Name |
Sign |
Date |
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Prepared
by : |
Albert
Chan, ACL - Environmental Consultant |
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8 Oct. 2004 |
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Reviewed by : |
Susana
Bezy, ACL – ET Leader |
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8 Oct. 2004 |
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Authorised by : |
Jon
Varndell, ACL – Project Mgr |
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8 Oct. 2004 |
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Distribution |
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Copy No |
Issue to |
Attention |
Corr. Ref. |
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1 |
CEDD |
Mr
H H Yeung |
3128/M45/200/OC6505/al |
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2,
3 |
EPD |
Mr
M W Ho |
3128/M45/200/OC6505/al |
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4 |
EPD
(LCO) |
Mr
Allan Hung |
3128/M45/200/OC6505/al |
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5 |
Leighton-China
State-Van Oord JV |
Mr
Malcolm Plummer |
3128/M45/200/OC6505/al |
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6 |
CRIII
Sites/PRE |
Mr
Douglas Miller |
3128/M45/200/OC6505/al |
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7 |
Independent
Checker (Environment) |
Mr
Bill Douglas |
3128/M45/200/OC6505/al |
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8 |
Environmental
Team Leader |
Ms
Susana Bezy |
3128/M45/200/OC6505/al |
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9 |
Office
Copy |
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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 September 2004
4.2 Monitoring Methodology
4.3 Monitoring Equipment
4.4 Impact Monitoring Results
5. Environmental
Complaint and Non-Compliance
5.1 Environmental Exceedances
5.2 Environmental
Complaint and Prosecution
5.3 Environmental
Enquiries
6.1 Key Issues for the
Coming Month
6.2 Monitoring Schedules
for the 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
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 fourteenth 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 September 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 2, 9, 16 and 23 September 2004.
·
Noise monitoring was
performed continuously for 24 hours.
·
Water quality monitoring was
undertaken on the following days:
-
1 September
2004
-
3 September
2004
-
6 September
2004
-
8 September 2004
-
10 September 2004
-
13 September 2004
-
15 September 2004
-
17 September 2004
-
20 September 2004
-
22 September 2004
-
24 September 2004
-
27 September 2004
-
29 September 2004
Exceedance of Action and Limit Levels
There was no environmental air quality monitoring required during the
reporting period.
Continuous noise monitoring was carried out during the reporting period
and no noise quality exceedances were recorded during the reporting month.
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 similarly low DO levels.
Elevated concentrations of SS were recorded
on 6, 15, 17, 20, 24, 29 and 29 September 2004. Investigations into these exceedances
found that they were generally attributed to ambient conditions and/or
influences not related to project works.
The results did not show any significant gradient effects between
stations located near the works and stations located farther away from the
works. Further, additional SS
monitoring at the Queensway Government Offices (QGO) outfall and Culvert J
noted high SS levels at these locations.
As such, elevated SS levels in the surrounding area may have been
significantly influenced by these discharges.
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 2, 9, 16 and 23 September 2004. No environmental
non-conformance and deficiencies were observed during the site inspections.
Future Key Issues
Future Key Issues are as follows:
·
Placing of underlayer and
armour rock at IRAW
·
Surcharge material works at
IRAW and IRAE;
·
Remaining dredging works at
IRAE;
·
Substructure works for the
CTB;
·
Superstructure works at Pier
No. 7; and
·
Cooling watermains work.
The Main Works Contract HK 12/02 for CRIII commenced on 28th February
2003. Leighton-China State-Van Oord Joint Venture (LCSVO-JV) was awarded the
Contract No. HK 12/02 for the construction of the CRIII Engineering Works. Contract HK 16/03 for the CRIII Hinterland
Drainage Improvement Works was awarded to Wang Kee Construction Co. Ltd. and
works for this contract commenced on 17 December 2003.
Atkins China Limited (ACL) has been commissioned by TDD (now called
CEDD) to undertake the environmental monitoring and audit work for the project
in accordance with the Environmental Permit (EP No. EP-122/2002) issued to TDD
on 7 March 2002. The CRIII Project
Organisation is shown in Annex A.
This is the fourteenth monthly
EM&A Report under the EIAO, which presents the results of EM&A
work conducted during the period from 1 to 30 September 2004, inclusive.
The works undertaken during the reporting
month include marine piling, 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 |
|
|
LCSVO-JV submitted an Application for Renewal of Construction Noise
Permit GW-TS0134-04 for the use of Powered Mechanical Equipment for the
purpose of carrying out construction works other than percussive piling
during restricted hours (Ref. H2189/9762/MP/DC/ ST/ec) |
27
September 2004 |
- |
|
1 |
LCSVO-JV submitted the Estimated Dumping Quantity for an Application
for a Permit to Dump Material (Category M & H Sediment) at Sea Under the
Dumping at Sea Ordinance (Ref. H2189/U2c/9674/MP/EY/ST/ec) |
21
September 2004 |
- |
|
2 |
LCSVO-JV submitted a Test Report for Treated Effluent for Wastewater
Discharge Licence No. EP880/W10/XX0195 (Ref. H2189/U2c/9428/MP/DC/ST/ec) |
10
September 2004 |
- |
|
3 |
LCSVO-JV submitted an Application for a Permit to Dump Material
(Category M & H Dredged Sediment) at Sea Under the Dumping at Sea
Ordinance (Ref. H2189/U2c/ 9403/MP/EY/ST/ec) |
9
September 2004 |
- |
|
4 |
LCSVO-JV submitted an Application for Renewal of Construction Noise
Permit GW-TS0117-04 (Ref. H2189/ U2c/9391/MP/EY/ST/ec) |
6
September 2004 |
- |
A summary of the status of the submissions provided
during the reporting month is presented in Table 2.2.
|
Table 2.2 - Summary of the
Contractor's Environmental Related Docu ment Submissions
to the Engineer’s Representatives (ER) |
|
Item |
Document
Title |
Version |
Date of
Submission to ER |
|
1 |
New
Construction Noise Permit (GW-RS0422-04) |
- |
28 September 2004 |
|
2 |
Disposal
of Chemical Waste (Trip Ticket issued) |
- |
11 September 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. 13 - August 2004 |
3128/HK12/02
M45/200/OC6415/SB/AC/al |
10
September 2004 |
- |
An environmental meeting was held on 3
September 2004 between the Contractor, CEDD, EPD and the ET to discuss the
exceedances reported in August 2004.
During the discussion, the ET summarised the
investigations and actions that were undertaken after the notification of
exceedances. Following the meeting, the
Contractor submitted a list of upcoming marine works and additional mitigation
measures for these works. These
measures include large scale floating silt curtains for sand filling works and
additional silt curtains to be placed around existing seawater intake silt
screens.
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 2, 9, 16 and
23 September 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
September 2004 is presented in Table 4.1.
|
Date of Sampling |
Tidal State |
Timing of Sampling |
|
1 September 2004 |
Mid Ebb |
12:32 - 15:25 |
|
Mid Flood |
07:26 - 11:04 |
|
|
3 September 2004 |
Mid Ebb |
13:20 - 16:17 |
|
Mid Flood |
07:38 - 11:10 |
|
|
6 September 2004 |
Mid Ebb |
15:09 - 17:47 |
|
Mid Flood |
10:40 - 13:35 |
|
|
8 September 2004 |
Mid Ebb |
07:46 - 10:54 |
|
Mid Flood |
15:10 - 17:55 |
|
|
10 September 2004 |
Mid Ebb |
08:21 - 11:07 |
|
Mid Flood |
15:10 - 17:40 |
|
|
13 September 2004 |
Mid Ebb |
10:32 - 13:22 |
|
Mid Flood |
15:18 - 18:00 |
|
|
15 September 2004 |
Mid Ebb |
10:42 - 13:38 |
|
Mid Flood |
15:46 - 18:46 |
|
|
17 September 2004 |
Mid Ebb |
13:06 - 15:05 |
|
Mid Flood |
07:42 - 10:35 |
|
|
20 September 2004 |
Mid Ebb |
14:29 - 17:07 |
|
Mid Flood |
09:45 - 12:44 |
|
|
22 September 2004 |
Mid Ebb |
07:38 - 10:44 |
|
Mid Flood |
15:17 - 17:59 |
|
|
24 September 2004 |
Mid Ebb |
07:46 - 10:10 |
|
Mid Flood |
15:16 - 18:04 |
|
|
27 September 2004 |
Mid Ebb |
10:35 - 13:40 |
|
Mid Flood |
15:21 - 18:05 |
|
|
29 September 2004 |
Mid Ebb |
10:58 - 13:42 |
|
Mid Flood |
15:43 - 18:33 |
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 |
25 July 2004 |
|
Turbidimeter |
Every 3 months for
secondary standards; meter is calibrated prior to each measurement to the
secondary standards |
30 June 2004 |
|
pH Meter |
Prior to each sampling day |
- |
|
Pyschrometer |
Every 6 months |
19 March 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 |
3.9 |
3.2 |
54 |
4.7 |
5 |
|
max |
5.2 |
4.5 |
72 |
10.8 |
11 |
|
|
avg |
4.4 |
3.9 |
63 |
7.4 |
8 |
|
|
sd |
0.3 |
0.4 |
6 |
1.7 |
2 |
|
|
C2 |
min |
3.7 |
3.1 |
55 |
4.4 |
5 |
|
max |
5.0 |
4.2 |
71 |
10.3 |
13 |
|
|
avg |
4.4 |
3.8 |
62 |
6.8 |
8 |
|
|
sd |
0.4 |
0.4 |
5 |
1.8 |
2 |
|
|
M7 |
min |
3.5 |
3.3 |
52 |
4.8 |
6 |
|
max |
4.9 |
4.5 |
72 |
10.1 |
10 |
|
|
avg |
4.3 |
3.9 |
61 |
7.5 |
8 |
|
|
sd |
0.4 |
0.4 |
6 |
1.6 |
2 |
|
|
M8 |
min |
3.6 |
3.3 |
52 |
4.7 |
5 |
|
max |
4.9 |
4.7 |
73 |
10.4 |
12 |
|
|
avg |
4.3 |
4.0 |
62 |
7.1 |
8 |
|
|
sd |
0.4 |
0.3 |
6 |
1.8 |
2 |
|
|
M9 |
min |
3.8 |
3.5 |
55 |
4.2 |
5 |
|
max |
4.9 |
4.4 |
71 |
11.0 |
11 |
|
|
avg |
4.3 |
4.0 |
62 |
7.6 |
8 |
|
|
sd |
0.3 |
0.3 |
5 |
2.0 |
2 |
|
|
M10 |
min |
3.9 |
3.4 |
56 |
4.7 |
6 |
|
max |
5.5 |
4.5 |
75 |
10.6 |
11 |
|
|
avg |
4.5 |
3.9 |
63 |
7.5 |
8 |
|
|
sd |
0.4 |
0.3 |
6 |
1.7 |
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 3.6 and 5.5 mg/L with an average value of 4.4 mg/L and DO
measurements in the bottom layer ranged from 3.3 to 4.7 mg/L with an average
level of 4.0 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 3.7 to 5.2 mg/L with an average
value of around 4.4 mg/L; DO measurements in the bottom layer ranged between
3.1 and 4.5 mg/L with an average level of 3.8 mg/L.
SS levels during mid-ebb tide ranged from 5 to 12 mg/L with an average
value of 8 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 13 mg/L with an average of 8 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 |
3.7 |
2.9 |
48 |
4.8 |
5 |
|
max |
5.7 |
4.4 |
77 |
12.7 |
14 |
|
|
avg |
4.5 |
3.9 |
63 |
8.4 |
9 |
|
|
sd |
0.5 |
0.4 |
8 |
2.5 |
3 |
|
|
C2 |
min |
3.7 |
2.9 |
49 |
4.9 |
5 |
|
max |
7.1 |
4.7 |
93 |
9.2 |
13 |
|
|
avg |
4.5 |
3.8 |
63 |
7.3 |
8 |
|
|
sd |
0.9 |
0.5 |
11 |
1.5 |
3 |
|
|
M7 |
min |
3.2 |
3.3 |
46 |
5.2 |
5 |
|
max |
5.1 |
4.6 |
68 |
10.0 |
16 |
|
|
avg |
4.1 |
3.8 |
59 |
7.7 |
8 |
|
|
sd |
0.5 |
0.4 |
7 |
1.6 |
3 |
|
|
M8 |
min |
3.2 |
2.9 |
45 |
5.8 |
5 |
|
max |
7.3 |
4.8 |
94 |
9.4 |
13 |
|
|
avg |
4.4 |
4.0 |
64 |
7.8 |
8 |
|
|
sd |
1.0 |
0.5 |
12 |
1.4 |
3 |
|
|
M9 |
min |
3.2 |
2.9 |
44 |
4.7 |
5 |
|
max |
7.0 |
4.8 |
92 |
11.4 |
14 |
|
|
avg |
4.3 |
3.8 |
61 |
8.0 |
9 |
|
|
sd |
0.9 |
0.5 |
11 |
2.2 |
3 |
|
|
M10 |
min |
3.5 |
2.8 |
47 |
4.6 |
5 |
|
max |
6.4 |
4.8 |
85 |
13.0 |
14 |
|
|
avg |
4.5 |
4.0 |
64 |
8.3 |
8 |
|
|
sd |
0.7 |
0.5 |
9 |
2.7 |
3 |
|
During mid-flood tide, DO levels at marine-based impact stations (M8
& M10) in the surface to middle layer ranged from 3.2 to 7.3 mg/L with an
average level of 4.5 mg/L while DO values in the bottom layer ranged between
2.8 and 4.8 mg/L with an average of 4.0 mg/L.
Similar DO concentrations were recorded at the control stations in the
surface to middle layer during mid-flood survey ranged between 3.7 and 7.1 mg/L
with an average value of 4.5 mg/L and DO results in the bottom layer ranged
from 2.9 and 4.7 mg/L with an average of 3.9 mg/L.
SS content ranged between 5 and 14 mg/L (for stations M8 & M10) with
an average of 8 mg/L during mid-flood tide and ranged from 5 to 14 mg/L with an
average value of 9 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 |
3.1 |
47 |
3.7 |
5 |
|
max |
5.0 |
76 |
13.0 |
12 |
|
|
avg |
3.9 |
59 |
8.1 |
8 |
|
|
sd |
0.5 |
8 |
2.7 |
2 |
|
|
M2 |
min |
2.7 |
40 |
4.4 |
6 |
|
max |
4.5 |
67 |
12.3 |
18 |
|
|
avg |
3.5 |
53 |
9.0 |
11 |
|
|
sd |
0.5 |
8 |
2.5 |
4 |
|
|
M3 |
min |
3.0 |
44 |
4.1 |
5 |
|
max |
4.6 |
69 |
12.6 |
11 |
|
|
avg |
3.7 |
54 |
7.5 |
8 |
|
|
sd |
0.5 |
7 |
2.3 |
2 |
|
|
M4 |
min |
2.9 |
43 |
4.2 |
4 |
|
max |
4.3 |
65 |
12.1 |
15 |
|
|
avg |
3.6 |
54 |
7.6 |
8 |
|
|
sd |
0.4 |
6 |
2.4 |
3 |
|
|
M5 |
min |
2.9 |
43 |
4.4 |
7 |
|
max |
5.1 |
77 |
13.9 |
16 |
|
|
avg |
3.8 |
56 |
9.0 |
11 |
|
|
sd |
0.6 |
10 |
2.6 |
3 |
|
|
M6 |
min |
2.4 |
36 |
3.9 |
5 |
|
max |
5.2 |
78 |
14.9 |
15 |
|
|
avg |
3.6 |
53 |
8.2 |
9 |
|
|
sd |
2.4 |
36 |
3.9 |
5 |
|
|
M11 |
min |
3.0 |
45 |
3.8 |
6 |
|
max |
5.0 |
76 |
12.0 |
12 |
|
|
avg |
4.0 |
60 |
7.8 |
8 |
|
|
sd |
0.6 |
9 |
2.4 |
2 |
|
|
M12 |
min |
2.9 |
43 |
3.9 |
6 |
|
max |
5.0 |
76 |
10.9 |
15 |
|
|
avg |
3.7 |
55 |
7.5 |
10 |
|
|
sd |
0.6 |
9 |
2.5 |
3 |
|
Seawater intake results during mid-ebb tide, Table 4.7, show that DO levels ranged from 2.4 to 5.2 mg/L with an average of 3.7 mg/L. SS ranged between 4 and 18 mg/L with an average value of 9 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 8, 15, 17, 20, 24, 27 and 29 September 2004. These levels were investigated and it was found that they were attributable to poor 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 |
3.1 |
47 |
5.1 |
6 |
|
max |
4.6 |
70 |
12.7 |
12 |
|
|
avg |
3.9 |
59 |
9.3 |
10 |
|
|
sd |
3.1 |
47 |
5.1 |
6 |
|
|
M2 |
min |
3.0 |
45 |
5.4 |
8 |
|
max |
4.4 |
67 |
13.9 |
16 |
|
|
avg |
3.6 |
54 |
10.1 |
12 |
|
|
sd |
0.5 |
7 |
2.6 |
3 |
|
|
M3 |
min |
2.7 |
41 |
4.9 |
9 |
|
max |
4.6 |
67 |
12.3 |
16 |
|
|
avg |
3.6 |
53 |
9.1 |
12 |
|
|
sd |
0.5 |
8 |
1.9 |
2 |
|
|
M4 |
min |
3.0 |
45 |
5.3 |
7 |
|
max |
4.7 |
70 |
10.6 |
14 |
|
|
avg |
3.8 |
57 |
8.5 |
10 |
|
|
sd |
0.5 |
8 |
1.8 |
3 |
|
|
M5 |
min |
2.8 |
43 |
4.3 |
6 |
|
max |
4.5 |
67 |
12.6 |
13 |
|
|
avg |
3.7 |
55 |
8.2 |
9 |
|
|
sd |
0.5 |
8 |
2.5 |
2 |
|
|
M6 |
min |
2.7 |
40 |
4.8 |
5 |
|
max |
4.6 |
68 |
12.2 |
16 |
|
|
avg |
3.6 |
53 |
8.9 |
10 |
|
|
sd |
0.6 |
9 |
2.7 |
3 |
|
|
M11 |
min |
2.9 |
44 |
4.9 |
6 |
|
max |
4.7 |
70 |
12.1 |
13 |
|
|
avg |
3.9 |
58 |
9.0 |
9 |
|
|
sd |
0.6 |
9 |
2.3 |
2 |
|
|
M12 |
min |
3.0 |
45 |
4.5 |
6 |
|
max |
4.5 |
67 |
11.2 |
19 |
|
|
avg |
3.7 |
56 |
8.3 |
11 |
|
|
sd |
0.5 |
8 |
2.5 |
4 |
|
During mid-flood survey, Table 4.8 shows that DO levels at seawater intake stations ranged from 2.7 to 4.7 mg/L with an average of 3.7 mg/L. SS ranged from 5 to 19 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 8, 15, 17, 20, 24, 27 and 29 September 2004 were investigated and were found that to be attributable to poor 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.
No noise quality exceedances were recorded during the reporting month.
During the reporting period,
exceedances of the water quality criteria were generally found to be not 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 a few occasions. Visual
observations of the harbour during the reporting month noted that the water is
generally murky and floating debris can be seen throughout Victoria Harbour,
including areas well beyond the project site.
Elevated concentrations of SS were recorded
on 6, 15, 17, 20, 24, 29 and 29 September 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 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 exceedances recorded on 24, 27 and
29 September 2004, the additional SS monitoring results indicated that SS
levels at the QGO outfall were relatively high. As such, elevated SS levels in the surrounding area (e.g.
stations M5 and M6) may be significantly influenced by these discharges. Further, on 29 September, a high SS level
was recorded at Culvert J indicating that water quality in the surrounding area
(e.g. stations M3 and M4) may be significantly influenced by this discharge.
Although DO levels below the Action and Limit
Levels 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 similarly low DO
levels. Further, the results do not
show any significant gradient effect between stations close to the marine works
and stations more remote to the works area.
The Agriculture, Fisheries and Conservation
Department (AFCD) observed red tide occurrences in Hong Kong waters (including
Victoria Harbour) during early September.
These occurrences have the potential to reduce DO levels in the
surrounding waters.
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 23 September 2004, and the IEC's site inspection
report is provided in Annex K.
During the site inspection conducted on 2
September 2004, the silt curtain used for rock filling works at IRAW was found
to be slightly damaged to one side. The
Contractor was requested to repair the silt curtain before carrying out further
rock filling works in the area. It was
also noted that an external contractor was undertaking maintenance work for
HSBC's seawater pumping station during the inspection.
The silt curtain used for the grab dredger
was found damaged during the inspection carried out on 23 September 2004. The Contractor was asked to stop dredging
works until the silt curtain has been repaired or replaced. During the inspection, the Contractor was
also reminded that the wheels of dump trucks should be washed before the
vehicles leave the site, particularly for the watermains works at CR-10.
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 underlayer and
armour rock at IRAW
·
Surcharge material works at
IRAW and IRAE;
·
Remaining dredging works at
IRAE;
·
Substructure works for the
CTB;
·
Superstructure works at Pier
No. 7;
·
Cooling watermains work; and
·
Maintenance and necessary
repairs to the 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 October 2004 |
08:30 |
13:53 |
|
4 October 2004 |
10:17 |
15:09 |
|
6 October 2004 |
08:30 |
17:00 |
|
8 October 2004 |
08:30 |
17:00 |
|
11 October 2004 |
10:24 |
17:00 |
|
13 October 2004 |
11:46 |
17:00 |
|
15 October 2004 |
08:30 |
14:00 |
|
18 October 2004 |
09:40 |
15:04 |
|
20 October 2004 |
08:00 |
17:00 |
|
22 October 2004 |
08:30 |
15:35 |
|
25 October 2004 |
10:17 |
17:00 |
|
27 October 2004 |
11:42 |
17:00 |
|
29 October 2004 |
08:30 |
14:00 |
|
1 November 2004 |
09:15 |
14:07 |
|
3 November 2004 |
07:00 |
15:23 |
|
5 November 2004 |
08:30 |
17:00 |
|
8 November 2004 |
08:48 |
16:01 |
|
10 November 2004 |
10:29 |
16:40 |
|
12 November 2004 |
11:57 |
17:00 |
|
15 November 2004 |
08:46 |
14:02 |
|
17 November 2004 |
11:05 |
15:33 |
|
19 November 2004 |
08:30 |
17:00 |
|
22 November 2004 |
08:56 |
15:42 |
|
24 November 2004 |
10:34 |
16:38 |
|
26 November 2004 |
11:52 |
17:00 |
|
29 November 2004 |
08:30 |
14:00 |
|
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 |
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 were generally found to be not 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 a few occasions. Visual
observations of the harbour during the reporting month noted that the water is
generally murky and floating debris can be seen throughout Victoria Harbour,
including areas well beyond the project site.
Due to the poor ambient
conditions, low DO levels have been recorded at seawater intake and
marine-based stations. Investigations
into the low DO levels found that they were not due to project works as control
stations recorded similarly low levels.
Elevated SS levels were
recorded on several occasions in September 2004. Investigations into these exceedances found that they were
generally attributed to ambient conditions and/or influences not related to
project works. The results 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.