TABLE OF CONTENTS
Page
2.4 Monitoring Parameters, Frequency and Duration
2.6 Monitoring Schedule for the Reporting Month
3.4 Monitoring Parameters, Frequency and
Duration
3.6 Monitoring Schedule for the Reporting Month
4 ENVIRONMENTAL
SITE INSPECTION AND AUDIT
4.2 Advice on the Solid and Liquid Waste
Management Status
4.3 Environmental Licenses and Permits
4.4 Implementation Status of Environmental
Mitigation Measures
4.5 Summary of Exceedances of the Environmental
Quality Performance Limit
4.6 Summary of Complaints, Notification of
Summons and Successful Prosecutions
5.1 Construction Programme for the Coming Months
5.2 Key Issues for the Coming Month
5.3 Monitoring Schedule for the Coming Month
6 ConclusionS
AND RECOMMENDATIONS
List of Tables
Table 1.1 Contact
Information of Key Personnel
Table 2.1 Air Quality
Monitoring Equipment
Table 2.2 Locations of Impact
Air Quality Monitoring Stations
Table 2.3 Air Quality
Monitoring Parameters, Frequency and Duration
Table 2.4 Summary of 1-hour TSP
Monitoring Results in the Reporting Period
Table 2.5 Summary of 24-hour
TSP Monitoring Results in the Reporting Period
Table 3.1 Noise Monitoring
Equipment
Table 3.2 Locations of Impact
Noise Monitoring Stations
Table 3.3 Noise Monitoring
Parameters, Frequency and Duration
Table 3.4 Summary of Construction Noise Monitoring Results in
the Reporting Period
Table 4.1 Summary
of Environmental Licensing and Permit Status
Figures
Figure 1.1 General Project Layout Plan
Figure 2.1 Location of EM&A Monitoring Stations
Figure 4.1 Environmental Complaint Handling Procedures
List of Appendix
Appendix A Project Organization Structure
Appendix B Construction Programme
Appendix C Implementation Schedule of Environmental Mitigation Measures
(EMIS)
Appendix
D Summary of Action and Limit Levels
Appendix E Calibration Certificates of Equipments
Appendix F EM&A Monitoring Schedules
Appendix G Air Quality Monitoring Results
Appendix H Meteorological Data for the Reporting Month
Appendix I Noise Monitoring Results
Appendix K Site
Inspection Summary
Appendix L Statistics on Complaints, Notifications
of Summons and Successful Prosecutions
The
proposed widening of Tolo Highway and Fanling Highway between Island House
Interchange and Fanling (the Project) is a Designated Project under the
Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is governed by an Environmental Permit (EP-324/2008)(EP). The Project aims to widen
The
construction works for this Project will be delivered in 2 stages i.e. Stage 1
(between Island House Interchange and Tai Hang) and Stage 2 (between Tai Hang
and Wo Hop Shek Interchange). The construction works of Stage 1 were commenced
on 23 November 2009 and will tentatively be completed in December 2013; while
construction programme of Stage 2 is currently under review. This report
focuses on Stage 1 of the Project only.
The
construction phase of Stage 1 under the EP commenced on 23 November 2009.
The
EM&A programme for Stage 1 of the Project commenced on 23 November 2009.
The impact environmental monitoring and audit includes air quality and noise
monitoring.
This
report documents the findings of EM&A works conducted in the period between
1 and 31 December 2010. As informed by the Contract 1 Contractor (CSCE),
construction activities in the reporting period were:
- Temporary shoring, sheetpiling and excavation;
- Bored piling;
- Pipe pile wall construction;
- Pile cap construction;
- Bridge construction;
- Tree felling and transplanting of trees;
- Installation of soil nails;
- At-grade road construction;
- Demolition of central dividers;
- Retaining wall construction;
- Demolition of bridges; and
- Slope works.
- Excavation of trial trenches to locate existing utilities;
- Ground investigation and predrilling;
- Construction of haul road;
- Piling and pile cap of bridges;
- Construction of Pilecap / Spread footing of Noise Barrier / Semi Noise Enclosure;
- Slope works, including installation of soil nail;
- Entrusted watermain works;
- Retaining wall construction;
- Modification of existing bridge structure; and
- Sewer installation.
There was no reporting change required in
the reporting month.
Breaches of Action and Limit
Levels for Air Quality
No exceedance of Action and Limit Level was recorded for 1-hour and
24-hour TSP monitoring in the reporting month.
Breaches of Action and Limit
Levels for Noise
One noise related
complaint was followed up by Environmental Team in the reporting month, but it
was related to time period outside the 0700-1900 hours on normal weekdays and
it was considered not related to the Project, hence no Action Level exceedance
of noise was recorded.
No Limit Level exceedance of noise was recorded in the reporting month.
Complaint, Notification of
Summons and Successful Prosecution
One (1) environmental
complaint was followed up by Environmental Team in December 2010. However it
was considered not related to the Project.
No notification of
summons and successful prosecution was received in the reporting month.
Future Key Issues
Key issues to be
considered in the coming month included:
- Properly store and label oils and chemicals on site;
- Chemical
and waste management;
- Collection
of construction waste should be carried out regularly;
- Site
runoff should be properly collected and treated prior to discharge;
- Suppress
dust generated from excavation and drilling activities, and haul road traffic;
- Quieter
powered mechanical equipment should be used;
- Closely check and
replace the sound insulation materials wrapped at the concrete breaker tip
regularly;
- Better scheduling
of construction works to minimize noise nuisance; and
- Properly
maintain all drainage faculties on site.
1.1.1.
1.1.2.
The objective of the Project “Widening of Tolo
Highway /
1.1.3.
The Project is a designated project and is governed
by an Environmental Permit (EP-324/2008)(EP).
1.1.4.
The scope of the Project comprises mainly:
(i) |
Widening
of a 5.7 km section of Tolo Highway and 3.0 km section of Fanling Highway
between Island House Interchange and Wo Hop Shek Interchange from the
existing dual 3-lane to dual 4-lane, including construction of new vehicular
bridges; |
(ii) |
Widening of
interchange sections at Island House Interchange, Tai Po North Interchange,
and Lam Kam Road Interchange from dual 2-lane to dual 3-lane, including
realignment of various slip roads; |
(iii) |
Modification
and reconstruction of highways, vehicular bridges, underpasses and
footbridges. |
1.1.5.
The construction works for this Project will be
delivered in 2 stages i.e. Stage 1 (between Island House Interchange and Tai
Hang) and Stage 2 (between Tai Hang and Wo Hop Shek Interchange). The
construction works of Stage 1 commenced on 23 November 2009 and will
tentatively be completed in December 2013; while construction
programme of Stage 2 is currently under review. This report focuses on Stage 1 of the
Project only.
1.1.6.
The construction works for Stage 1 of the Project will
be implemented under 2 works contracts (Contract 1 and Contract 2). Contract 1 covers the section of
1.1.7.
China State Construction Engineering (Hong Kong)
Ltd. (CSCE) was commissioned as the Contractor of Contract 1 of Stage 1 of the
Project, while Gammon
Construction Limited was commissioned as the Contractor of Contract 2 of Stage 1 of the
Project. AECOM Asia Co. Ltd. was employed by Highways Department as the
Environmental Team to undertake the EM&A works for Stage 1 of the Project.
1.1.8.
Hyder-Arup-Black
and Veatch Joint Venture are appointed by Highways Department as the
consultants for the design and construction assignment for the Tolo project
under Agreement No. CE 58/2000 (i.e. the Engineer for the Contracts) and Mott
MacDonald Hong Kong Ltd. acts as the Independent Environmental Checker (IEC)
for the Contracts.
1.1.9.
The
construction phase of Stage 1 under the EP commenced on 23 November 2009.
1.1.10.
According
to the updated EM&A Manual of Stage 1 of the Project, there is a need of an
EM&A programme including air quality and noise monitoring. The
EM&A programme for Stage 1 of the Project commenced on 23 November 2009.
1.2.
Scope of Report
1.2.1.
This is the fourteenth monthly Environmental
Monitoring and Audit (EM&A) Report under the Agreement No. CE 20/2009 (EP)
- Widening of
1.3.
Project
Organization
1.3.1. The project organization is shown in Appendix A. The key personnel contact names and numbers are summarized in Table 1.1.
Table 1.1 Contact Information of Key Personnel
Party |
Position |
Name |
Telephone |
Fax |
ER of Stage 1, Contract 1 (Hyder-Arup-Black
& Veatch Joint Venture) |
Chief Resident Engineer /TOLO1 |
James Tsang |
9038 8797 |
26674000 |
ER of Stage 1, Contract 2 (Hyder-Arup-Black
& Veatch Joint Venture) |
Chief Resident Engineer /TOLO2 |
Paul Appleton |
9097 5833 |
2653 2348 |
IEC of Stage 1 (Mott MacDonald Hong Kong Limited) |
Independent Environmental
Checker |
Terence Kong |
2828 5919 |
2827 1823 |
Contractor
of Stage 1, Contract 1 (CSCE) |
Site Agent |
David Lau |
9499 0818 |
2667 5666 |
Environmental Officer |
Michael Tsang |
9277 4956 |
2667 5666 |
|
Contractor
of Stage 1, Contract 2 (Gammon) |
Construction
Manager |
K F Tam |
9032 1133 |
2559 3410 |
Environmental
Officer |
Ir Thomson Chang |
9213 6569 |
2559 3410 |
|
ET of Stage 1 (AECOM) |
ET Leader |
Y T Tang |
2893 1551 |
2891 0305 |
1.4.
Summary of
Construction Works
1.4.1. The construction phase of Stage 1 under the EP commenced on 23 November 2009.
1.4.2. Details of the construction works carried out by the Contract 1 Contractor (CSCE) in this reporting period are listed below:
- Temporary shoring, sheetpiling and excavation;
- Bored piling;
- Pipe pile wall construction;
- Pile cap construction;
- Bridge construction;
- Tree felling and transplanting of trees;
- Installation of soil nails;
- At-grade road construction;
- Demolition of central dividers;
- Retaining wall construction;
- Demolition of bridges; and
- Slope works.
1.4.3.
Details
of the construction works carried out by the Contract 2 Contractor (Gammon) in
this reporting period are listed below:
- Excavation of trial trenches to locate existing utilities;
- Ground investigation and predrilling;
- Construction of haul road;
- Piling and pile cap of bridges;
- Construction of Pilecap / Spread footing of Noise Barrier / Semi Noise Enclosure;
- Slope works, including installation of soil nail;
- Entrusted watermain works;
- Retaining wall construction;
- Modification of existing bridge structure; and
- Sewer installation.
1.4.4. The Construction Programmes are shown in Appendix B.
1.4.5. The general layout plan of the Project site showing the contract area is shown in Figure 1.1.
1.4.6. The mitigation measures implementation schedule are presented in Appendix C.
1.5.
Summary of
EM&A Programme Requirements
1.5.1. The EM&A programme required environmental monitoring for air quality, noise and environmental site inspections for air quality, noise, waste management, ecology, and landscape and visual impact. The EM&A requirements for each parameter described in the following sections include:
-
All monitoring parameters;
-
Monitoring schedules for the reporting month
and forthcoming months;
-
Action and Limit levels for all environmental
parameters;
-
Event / Action Plan;
-
Environmental mitigation measures, as
recommended in the Project EIA study final report; and
- Environmental
requirement in contract documents.
Table 2.1 Air Quality Monitoring Equipment
Equipment |
Brand and
Model |
Portable direct reading dust meter (1-hour TSP) |
Sibata Digital Dust Monitor (Model No. LD-3) |
High Volume Sampler |
Tisch Total Suspended Particulate Mass Flow Controlled
High Volume Air Sampler (Model No. TE-5170) |
Table 2.2 Locations of
Impact Air Quality Monitoring Stations
Monitoring Station |
Location |
Description |
AM1A |
3 Sheung Wun Yiu |
Ground floor at the
boundary outside |
AM2 |
12 Shan Tong New Village |
Ground floor outside the premises |
AM3 |
Riverain Bayside |
Roof of the switch room |
AM4 |
|
Roof of the school |
Table 2.3 Air Quality Monitoring Parameters, Frequency and Duration
Parameter |
Frequency and
Duration |
1-hour TSP |
Three
times every 6 days while the highest dust impact was expected |
24-hour TSP |
Once
every 6 days |
(a)
The HVS was installed in the vicinity of the air
sensitive receivers. The following
criteria were considered in the installation of the HVS.
(i)
A horizontal platform with appropriate support to
secure the sampler against gusty wind was provided.
(ii)
The distance between the HVS and any obstacles,
such as buildings, was at least twice the height that the obstacle protrudes
above the HVS.
(iii)
A minimum of 2 meters separation from walls,
parapets and penthouse for rooftop sampler.
(iv)
No furnace or incinerator flues nearby.
(v)
Airflow around the sampler was unrestricted.
(vi)
Permission was obtained to set up the samplers and
access to the monitoring stations.
(vii)
A secured supply of electricity was obtained to
operate the samplers.
(viii)
The sampler was located more than 20 meters from
any dripline.
(ix)
Any wire fence and gate, required to protect the
sampler, did not obstruct the monitoring process.
(x)
Flow control accuracy was kept within ±2.5%
deviation over 24-hour sampling period.
(b)
Preparation of Filter Papers
(i)
Glass fibre filters, G810 were labelled and
sufficient filters that were clean and without pinholes were selected.
(ii)
All filters were equilibrated in the conditioning
environment for 24 hours before weighing. The conditioning environment
temperature was around
(iii)
All filter papers were prepared and analysed by ALS
Technichem (HK) Pty Ltd., which is a HOKLAS accredited laboratory and has
comprehensive quality assurance and quality control programmes.
(c)
Field Monitoring
(i)
The power supply was checked to ensure the HVS
works properly.
(ii)
The filter holder and the area surrounding the
filter were cleaned.
(iii)
The filter holder was removed by loosening the four
bolts and a new filter, with stamped number upward, on a supporting screen was
aligned carefully.
(iv)
The filter was properly aligned on the screen so
that the gasket formed an airtight seal on the outer edges of the filter.
(v)
The swing bolts were fastened to hold the filter
holder down to the frame. The pressure
applied was sufficient to avoid air leakage at the edges.
(vi)
Then the shelter lid was closed and was secured
with the aluminum strip.
(vii)
The HVS was warmed-up for about 5 minutes to
establish run-temperature conditions.
(viii)
A new flow rate record sheet was set into the flow
recorder.
(ix)
On site temperature and atmospheric pressure
readings were taken and the flow rate of the HVS was checked and adjusted at
around 1.1 m3/min, and complied with the range specified in the
updated EM&A Manual (i.e. 0.6-1.7 m3/min).
(x)
The programmable digital timer was set for a
sampling period of 24 hrs, and the starting time, weather condition and the
filter number were recorded.
(xi)
The initial elapsed time was recorded.
(xii)
At the end of sampling, on site temperature and
atmospheric pressure readings were taken and the final flow rate of the HVS was
checked and recorded.
(xiii)
The final elapsed time was recorded.
(xiv)
The sampled filter was removed carefully and folded
in half length so that only surfaces with collected particulate matter were in
contact.
(xv)
It was then placed in a clean plastic envelope and
sealed.
(xvi)
All monitoring information was recorded on a
standard data sheet.
(xvii)
Filters were then sent to ALS Technichem (HK) Pty
Ltd. for analysis.
(d)
Maintenance and Calibration
(i)
The HVS and its accessories were maintained in good
working condition, such as replacing motor brushes routinely and checking
electrical wiring to ensure a continuous power supply.
(ii)
5-point calibration of the HVS was conducted using
TE
(iii)
Calibration certificate of the HVSs are provided in
Appendix E.
(a)
Measuring Procedures
The measuring procedures of the 1-hour dust
meter were in accordance with the Manufacturer’s Instruction Manual as follows:
(i)
Turn the power on.
(ii)
Close the air collecting opening cover.
(iii)
Push the “TIME SETTING” switch to [BG]
(iv)
Push “START/STOP” switch to perform background
measurement for 6 seconds.
(v)
Turn the knob at SENSI ADJ position to insert the
light scattering plate.
(vi)
Leave the equipment for 1 minute upon “SPAN CHECK” is
indicated in the display.
(vii)
Push “START/STOP” switch to perform automatic
sensitivity adjustment. This measurement takes 1 minute.
(viii)
Pull out the knob and return it to MEASURE
position.
(ix)
Push the “TIME SETTING” switch the time set in the
display to 3 hours.
(x)
Lower down the air collection opening cover.
(xi)
Push “START/STOP” switch to start measurement.
(b)
Maintenance and Calibration
(i)
The 1-hour TSP meter was calibrated at 1-year
intervals against a continuous particulate TEOM Monitor, Series 1400ab. Calibration
certificates of the Laser Dust Monitors are provided in Appendix E.
(ii)
1-hour validation checking of the TSP meter against
HVS is carried out yearly at the air quality monitoring locations.
Table 2.4 Summary of 1-hour TSP Monitoring
Results in the Reporting Period
|
Average (mg/m3) |
Range (mg/m3) |
Action Level (mg/m3) |
Limit Level (mg/m3) |
AM1A |
76.2 |
62.6 – 88.9 |
302.1 |
500 |
AM2 |
77.7 |
63.4 – 88.5 |
301.9 |
500 |
AM3 |
76.7 |
61.8 – 89.8 |
301.9 |
500 |
AM4 |
77.7 |
64.1 – 90.2 |
302.3 |
500 |
Table 2.5 Summary of 24-hour TSP Monitoring Results in the Reporting
Period
|
Average (mg/m3) |
Range (mg/m3) |
Action Level (mg/m3) |
Limit Level (mg/m3) |
AM1A |
64.5 |
40.6 – 107.8 |
176.6 |
260 |
AM2 |
49.7 |
29.5 – 74.6 |
178.6 |
260 |
AM3 |
57.9 |
16.0 – 112.4 |
193.1 |
260 |
AM4 |
71.0 |
51.0 – 126.1 |
198.5 |
260 |
Table 3.1 Noise
Monitoring Equipment
Equipment |
Brand and Model |
Integrated Sound Level
Meter |
B&K (Model No.
2238) |
Rion NL-31 |
|
Acoustic Calibrator |
B&K (Model No.
4231) |
Rion NC-73 |
Table 3.2 Locations
of Impact Noise Monitoring Stations
Monitoring Station |
Location |
Description |
NM1 |
|
|
NM2 |
38 Ha Wun Yiu |
1.2m from the ground floor free-field of the
village house |
NM3 |
|
|
NM4 |
|
1m from the exterior of the roof top façade of
Block 4 |
NM5 |
The Paragon |
|
NM6 |
PLK Tin Ka Ping
Primary School |
1.2m ground floor
free-field near the entrance |
NM7 |
Riverain Bayside |
1m from the exterior of the roof façade of the
switch room |
Table
3.3 Noise Monitoring Parameters,
Frequency and Duration
Parameter |
Frequency and
Duration |
30-mins
measurement at each monitoring station between 0700 and 1900 on normal
weekdays. Leq, L10 and L90 would be
recorded. |
At least once per week |
(a)
Façade measurements were made at all monitoring
locations, except monitoring stations NM2 and NM6.
(b)
The sound level meter was set on a tripod at a
height of
(c)
The battery condition was checked to ensure the
correct functioning of the meter.
(d)
Parameters such as frequency weighting, the time
weighting and the measurement time were set as follows:
(i)
frequency weighting: A
(ii)
time weighting: Fast
(iii)
time measurement: Leq(30-minutes) during
non-restricted hours i.e. 07:00 – 1900 on normal weekdays; Leq(5-minutes)
during restricted hours i.e. 19:00
– 23:00 and 23:00 – 07:00 of normal weekdays, whole day of Sundays and Public
Holidays
(e)
Prior to and after each noise measurement, the
meter was calibrated using the acoustic calibrator for 94dB(A) at 1000 Hz. If the difference in the calibration level
before and after measurement was more than 1 dB(A), the measurement would be
considered invalid and repeat of noise measurement would be required after
re-calibration or repair of the equipment.
(f)
During the monitoring period, the Leq, L10
and L90 were recorded. In
addition, site conditions and noise sources were recorded on a standard record
sheet.
(g)
Noise measurement was paused during periods of high
intrusive noise (e.g. dog barking, helicopter noise) if possible. Observations
were recorded when intrusive noise was unavoidable.
(h)
Noise monitoring was cancelled in the presence of
fog, rain, wind with a steady speed exceeding
(a)
The microphone head of the sound level meter was
cleaned with soft cloth at regular intervals.
(b)
The meter and calibrator were sent to the supplier
or HOKLAS laboratory to check and calibrate at yearly intervals.
(c)
Calibration certificates of the sound level meters
and acoustic calibrators are provided in Appendix E.
Table 3.4 Summary of Construction Noise
Monitoring Results in the Reporting Period
|
Average, dB(A), Leq (30 mins) |
Range, dB(A), Leq
(30 mins) |
Limit Level, dB(A), Leq
(30 mins) |
NM1 |
55.9 |
47.9 – 64.1 |
65/70# |
NM2 |
67.0* |
66.3 – 67.8* |
75 |
NM3 |
62.1 |
53.3 – 64.7 |
65/70# |
NM4 |
66.5 |
65.5 – 67.4 |
75 |
NM5 |
62.9 |
62.1 – 63.7 |
75 |
NM6 |
58.7* |
51.2 – 64.2* |
65/70# |
NM7 |
59.2 |
58.6 – 60.1 |
75 |
*+3dB(A)
Façade correction included
Air Quality
Noise
Water Quality
Chemical and Waste Management
Landscape and Visual Impact
Air Quality
Noise
Water Quality
Chemical and Waste Management
Landscape and Visual Impact
Table 4.1 Summary of Environmental Licensing and Permit Status
Statutory Reference |
License/ Permit |
License or Permit No. |
Valid Period |
License/ Permit Holder |
Remarks |
|
From |
To |
|||||
EIAO |
Environmental Permit |
EP-324/2008 |
23/12/2008 |
N/A |
HyD |
Tolo Highway/Fanling Hignway
between Island House Interchange and Ma Wo |
WPCO |
Discharge License (Office) |
WT00005096-2009 |
03/12/2009 |
31/12/2014 |
CSCE |
Discharge at Site Office |
Discharge License (Site) |
WT00005445-2009 |
15/12/2009 |
31/12/2014 |
CSCE |
Discharge of Construction
Runoff |
|
Discharge License (Office) |
WT00006782-2010 |
25/06/2010 |
30/06/2015 |
Gammon |
Discharge at Site Office |
|
Discharge License (Site) |
WT00007162-2010 |
09/08/2010 |
31/07/2015 |
Gammon |
Discharge of Construction
Runoff |
|
WDO |
Chemical Waste Producer
Registration |
5213-727-C3249-46 |
25/09/2009 |
N/A |
CSCE |
Chemical waste produced in
Contract HY/2008/09 |
5213-722-G2347-18 |
18/05/2010 |
N/A |
Gammon |
Chemical waste produced in
Contract HY/2009/08 |
||
WDO |
Billing
Account for Disposal of Construction Waste |
7009328 |
08/09/2009 |
N/A |
CSCE |
Waste disposal in Contract
HY/2008/09 |
7010320 |
02/03/2010 |
N/A |
Gammon |
Waste disposal in Contract
HY/2009/08 |
||
NCO |
Construction Noise Permit |
GW-RN0321-10 |
14/9/2010 |
10/3/2011 |
CSCE |
Construction of TB1 & TB2 |
GW-RN0340-10 |
11/10/2010 |
10/4/2011 |
CSCE |
Construction of W4 to W7 |
||
GW-RN0364-10 |
22/10/2010 |
4/1/2011 |
CSCE |
Construction of Site Entrance
No. 29 and plant mobilization |
||
GW-RN0365-10 |
4/11/2010 |
15/1/2011 |
CSCE |
Loading and unloading along
Tolo Highway |
||
GW-RN0377-10 |
4/11/2010 |
31/1/2011 |
CSCE |
Road Maintenance |
||
GW-RN0402-10 |
22/11/2010 |
10/4/2011 |
CSCE |
Bored piling |
||
GW-RN0426-10 |
13/12/2010 |
4/3/2011 |
CSCE |
Construction of TB1 & TB2 |
||
GW-RN0432-10 |
19/12/2010 |
27/2/2011 |
CSCE |
Cutting trees along Tolo
Highway |
||
GW-RN0438-10 |
20/12/2010 |
13/6/2011 |
CSCE |
Works next to MTRC’s Tracks |
||
GW-RN0443-10 |
24/12/2010 |
19/6/2011 |
CSCE |
Construction of Bridges over
the Shan Tong Road and Tat Wan Road |
||
GW-RN0286-10 |
31/08/2010 |
28/02/2011 |
Gammon |
Installation of Safety Fence,
Delivery of Plant & Materials, and Alternation of Road Marking |
||
|
|
PP-RN0028-10 |
10/11/2010 |
7/5/2011 |
Gammon |
Drop hammer driving steel
sheet pile |
- Temporary shoring, sheetpiling and excavation;
- Bored piling;
- Pre-borded H-piles construction
- Pipe pile wall construction;
- Pile cap construction;
- Bridge construction;
- Tree felling and transplanting of trees;
- Installation of soil nails;
- At-grade road construction;
- Demolition of central dividers;
- Retaining wall construction; and
- Slope works.
- Excavation of trial trenches to locate existing utilities;
- Ground investigation and predrilling;
- Construction of haul road;
- Piling and pile cap of bridges;
- Construction of Pilecap / Spread footing of Noise Barrier / Semi Noise Enclosure;
- Slope works, including installation of soil nail;
- Entrusted watermain works;
- Retaining wall construction;
- Modification of existing bridge structure; and
- Sewer installation.
- Properly store and label oils and chemicals on site;
-
Chemical and waste management;
-
Collection of construction waste should be
carried out regularly;
-
Site runoff should be properly collected and
treated prior to discharge;
-
Suppress dust generated from excavation and
drilling activities, and haul road traffic;
-
Quieter powered mechanical equipment should
be used;
-
Closely check and replace the sound insulation
materials wrapped at the concrete breaker tip regularly;
-
Better scheduling of construction works to minimize
noise nuisance; and
-
Properly maintain all drainage faculties on
site.
Air Quality Impact
l All plants on site should be properly
maintained to avoid dark smoke emission.
l All vehicles should be washed to remove any dusty materials before leaving the site.
l Haul roads should be sufficiently dampened to minimize fugitive dust generation.
l Wheel washing facilities should be properly maintained to ensure properly functioning.
l Temporary exposed slopes and open stockpiles should be properly covered.
l Enclosure should be erected for cement mixing operations.
l Ensure all vehicles to be washed before leaving the site.
l Provide water spraying to suppress fugitive
dust for any dusty construction activity.
Construction Noise Impact
l Properly erect the temporary noise barriers in accordance with the Environmental Permit requirement.
l Noise barriers should be closely packed and properly aligned to ensure effective noise reduction.
l Noisy operations should be oriented to a direction away from sensitive receivers as far as possible.
l Sound insulation materials shall be wrapped at the breaker tip for concrete breaking works.
l Better scheduling of construction works to minimize noise nuisance.
Water Quality Impact
l Stagnant water accumulated in drip trays
should be removed.
l Silt, debris and leaves accumulated at public drains and perimeter u-channels should be cleaned up regularly.
l Silty effluent should be treated/desilted before discharged. Untreated effluent should be prevented from entering public drain channel.
Chemical and Waste
Management
l C&D material should be sorted and
removed timely.
l All plants and vehicles on site should be properly maintained to prevent oil leakage.
l Oil stains on soil surface and empty chemical
containers should be cleared and disposed of as chemical waste.
Landscape and Visual
Impact
l All retained trees should be properly fenced
off at the works area.