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 was governed by
a valid Environmental Permit (EP-324/2008 and EP-324/2008/A)(EP)
during the reporting period mentioned below. The Project aims to widen Tolo Highway
and Fanling Highway
to dual 4-lane carriageway in order to alleviate the current traffic congestion
problems and to cope with the increasing transport demands to and from the
urban areas and also cross boundary traffic.
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 and 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 November 2011 and 31 October 2012.
As
informed by the Contract 1 Contractor (China State
Construction Engineering (Hong Kong) Ltd.), construction activities in the
reporting period included:
-
At-grade road construction;
-
Bored piling;
-
Bridge construction;
-
Bridge jacking;
-
Demolition of central dividers;
-
Drainage works;
-
Noise barrier footing construction and panel installation;
-
Pile cap construction;
-
Pipe pile wall
construction;
-
Pre-bored H-piles construction;
-
Retaining wall construction;
-
Road paving;
-
Site investigation;
-
Slope works;
-
Soil nails works;
-
Temporary shoring, sheetpiling and excavation; and
-
Tree felling & transplantation.
The
construction works carried out by the Contract 2 Contractor (Gammon Construction Ltd.) in the
reporting period included:
-
Condition survey of existing structures;
-
Construction of haul road;
-
Construction of pilecap / spread footing of noise barrier / semi
noise enclosure;
-
Entrusted watermains works;
-
Excavation of trial trenches to locate existing utilities;
-
Extension of box culvert and subway;
-
Ground investigation and predrilling;
-
Modification of existing bridge structures;
-
Noise barrier construction;
-
Piling and structural works of bridges;
-
Retaining wall construction;
-
Sewer Installation; and
-
Slope works, including installation of soil nails.
Breaches of Action and Limit
Levels for Air Quality
No exceedance of Action and Limit Level was recorded for
1-hour TSP monitoring in the reporting period.
No exceedance of Limit Level was recorded for 24-hour TSP
monitoring in the reporting period.
One (1) Action Level exceedance was recorded for 24-hour TSP monitoring
at AM2 in the reporting period. The dust exceedance was considered not due to
the Project works.
Breaches of Action and Limit Levels for Noise
No Limit Level
exceedance of construction noise monitoring was recorded in the reporting
period.
There
were three (3) noise related complaints followed up by Environmental Team in the
reporting period,
hence, three (3) Action Level
exceedance of construction noise was recorded in the reporting period. Investigations were carried out.
The findings and the proposed mitigation measures were submitted to all
relevant parties. Summary of investigation is described in Section 7.1.
Complaint, Notification of
Summons and Successful Prosecution
Seven (7) environmental complaints were
followed up by Environmental Team in the reporting period. Investigations were carried out.
The findings and the proposed mitigation measures were submitted to all
relevant parties. Summary of
investigation is described in Section 7.1.
No
notification of summons and successful prosecution was received in the
reporting period.
Background
1.1.
Tolo Highway and Fanling Highway are expressways in the North East
New Territories
connecting Sha Tin, Tai Po and Fanling. These highways form a vital part of the
strategic Route 9, which links Hong Kong Island to Shenzhen. At present, this
section of Route 9 is dual 3-lane carriageway. However, at several major
interchanges along this section of Route 9, the highway is only dual-2 lane.
Severe congestion is a frequent occurrence during peak periods, particularly in
the Kowloon
bound direction.
1.2.
The
objective of the Project “Widening of Tolo Highway / Fanling Highway between Island House
Interchange and Fanling” is to widen Tolo
Highway and Fanling Highway to dual 4-lane
carriageway in order to alleviate the current traffic congestion problems and
to cope with the increasing transport demands to and from the urban areas and
also cross boundary traffic.
1.3.
The
Project is a designated project and was governed by a valid Environmental Permit (EP-324/2008 and
EP-324/2008/A)(EP) during the reporting period mentioned below.
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, except Sha Tin bound carriageway at Tai Po
North Interchange, which is widened from 3-lane to 4-lane, including
realignment of various slip roads;
|
|
(iii)
|
Modification and reconstruction of
highways, vehicular bridges, underpasses and footbridges.
|
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.
1.6.
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 Tolo Highway between Island House
Interchange and Ma Wo, Contract 2 covers the section of Tolo Highway between Ma Wo and Tai Hang.
1.7.
Hyder-Arup-Black
and Veatch Joint Venture (HABVJV) are appointed by Highways Department as the
consultants for the design and construction assignment for the Tolo project
under Agreement No. CE 58/2000 Supplementary Agreement No. 3 (SA3) (i.e. the
Engineer for the Contracts).
1.8.
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 (GCL) was commissioned as the Contractor of Contract 2 of Stage 1 of
the Project.
1.9.
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 and Mott MacDonald Hong
Kong Ltd. acts as the Independent Environmental Checker (IEC) for the
Contracts.
1.10. The construction phase of Stage 1 under the
EP commenced on 23 November 2009.
1.11. 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.
Scope of Report
1.12. This is the third Annual Environmental
Monitoring and Audit (EM&A) Review Report under the Agreement No. CE
20/2009 (EP) - Widening of Tolo Highway between Island House Interchange and
Tai Hang – Investigation. This report
presents a summary of the environmental monitoring and audit works, list of
activities and mitigation measures proposed by the ET for Stage 1 of the
Project from 1 November 2011 to 31 October 2012.
Project Organization
1.13. The project organization structure 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 Ltd.)
|
Independent Environmental Checker
|
Terence Kong
|
2828 5919
|
2827 1823
|
|
Contractor
of Stage 1, Contract 1
(China State Construction
Engineering (Hong Kong) Ltd.)
|
Site Agent
|
Eddie Tang
|
9863 7686
|
2667 5666
|
|
Environmental Officer
|
Michael Tsang
|
9277 4956
|
2667 5666
|
|
Contractor
of Stage 1, Contract 2
(Gammon Construction Ltd.)
|
Site Agent
|
John Chan
|
3126 1202
|
2559 3410
|
|
Environmental Officer
|
Thomson Chang
|
9213 6569
|
2559 3410
|
|
Crispin Ao
|
9223 8773
|
2559 3410
|
|
Ao Ho Fo
|
9220 5848
|
2559 3410
|
|
ET of Stage 1
(AECOM
Asia Company Limited)
|
ET Leader
|
Y T Tang
|
3922 9393
|
2891 0305
|
Summary of Construction Works
1.14.
The
construction phase of Stage 1 under the EP commenced on 23 November 2009.
Details of the construction works carried out by the Contract 1
Contractor (CSCE) in this reporting period are listed below:
-
At-grade road construction;
-
Bored piling;
-
Bridge construction;
-
Bridge jacking;
-
Demolition of central dividers;
-
Drainage works;
-
Noise barrier footing construction and panel installation;
-
Pile cap construction;
-
Pipe pile wall construction;
-
Pre-bored H-piles construction;
-
Retaining wall construction;
-
Road paving;
-
Site investigation;
-
Slope works;
-
Soil nails works;
-
Temporary shoring, sheetpiling and excavation; and
-
Tree felling & transplantation.
1.15.
The
construction works carried out by the Contract 2 Contractor (GCL) in the
reporting period were:
-
Condition survey of existing structures;
-
Construction of haul road;
-
Construction of pilecap / spread footing of noise barrier / semi
noise enclosure;
-
Entrusted watermains works;
-
Excavation of trial trenches to locate existing utilities;
-
Extension of box culvert and subway;
-
Ground investigation and predrilling;
-
Modification of existing bridge structures;
-
Noise barrier construction;
-
Piling and structural works of bridges;
-
Retaining wall construction;
-
Sewer Installation; and
-
Slope works, including installation of soil nails.
1.16.
The
general layout plan of the Project site showing the contract areas is shown in
Figure 1.1.
1.17.
The
environmental mitigation measures implementation schedule (EMIS) are presented
in Appendix B.
2
Environmental Monitoring
and Audit Requirements
Monitoring Parameters
2.
2.1.
The
updated EM&A Manual designated 4 air quality monitoring stations and 7
noise monitoring stations to monitor environmental impacts on air quality and
noise due to Stage 1 of the Project.
2.2.
For air
quality, monitoring locations AM2 (Shan Tong New Village) and AM3 (Riverain
Bayside) were set up at the proposed locations in accordance with updated
EM&A Manual. However, for monitoring locations: Dynasty View and Tai Po
Garden, proposed in the updated EM&A Manual, as approval could not be
obtained from the owner’s corporation of the premises, impact air quality
monitoring was conducted at alternative monitoring locations: AM1 (Ha Wun Yiu)
and AM4 (Tai Kwong Secondary School). The monitoring station at 13 Ha Wun Yiu
(AM1) was relocated to Fan Sin Temple, 3 Sheung Wun Yiu (AM1A) in February
2010. Also, the monitoring station at Tai Kwong Secondary School (AM4) was
relocated to 168 Shek Kwu Lung Village (AM4A) in September 2011.
2.3.
For
noise, monitoring stations NM3 (Wong Shiu Chi Middle School), NM6 (PLK Tin Ka
Ping Primary School) and NM7 (Riverain Bayside) were set up at the proposed
locations in accordance with updated EM&A Manual. However, for monitoring
locations: Tai Po Garden, Dynasty View, Hong Kong Teachers’ Association Lee
Heng Kwei Secondary School and Grand Palisades, proposed in the updated
EM&A Manual, as approval of access could not be obtained from the owner’s
corporation of the premises or the principal of the education institutes,
impact noise monitoring was conducted at alternative monitoring locations: NM1
(Tai Kwong Secondary School), NM2 (Ha Wun Yiu), NM4 (Uptown Plaza) and NM5 (The
Paragon). The monitoring station at Tai Kwong Secondary School (NM1) was
relocated to 168 Shek Kwu Lung Village (NM1A) in September 2011.
2.4.
As Tai
Kwong Secondary School was closed down with effect from 1 September 2011, air
quality (AM4) and noise (NM1) monitoring stations were relocated to 168 Shek
Kwu Lung Village, naming AM4A and NM1A respectively, starting from 1 September
2011. The same air quality Action and Limit of AM4 were adopted for AM4A. For
the measured construction noise level, the same noise Action Level of NM1 was
adopted for NM1A, whereas Limit Level for residential noise sensitive receiver
was adopted for NM1A.
2.5.
The
monitoring locations used during the reporting period are depicted in Figure
2.1.
2.6.
The
updated EM&A Manual also required environmental site inspections for air
quality, noise, water quality, chemical, waste management, ecology and landscape
and visual impact.
Environmental Quality Performance Limits
(Action/Limit Levels)
2.1
2.7.
The
environmental quality performance limits (i.e. Action/Limit Levels) of air
quality monitoring were derived from the baseline air quality monitoring
results at the respective monitoring stations (AM1, AM2, AM3 and AM4), while
the environmental quality performance limits of noise monitoring were defined
in the EM&A Manual.
2.8.
The
environmental quality performance limits of air quality and noise monitoring
are given in Appendix C.
Environmental Mitigation Measures
2.2
2.9.
Relevant
environmental mitigation measures were stipulated in the Particular
Specification and EP (EP-324/2008) for the Contractor to
adopt. A list of environmental mitigation measures and their implementation statuses
are given in Appendix B.
3
Air Quality Monitoring
3.
3.1.
Air
quality monitoring, including 1-hour and 24-hour TSP, was conducted at least 3
times every 6 days and at least once every 6 days respectively at the 4
monitoring stations, in accordance with the updated EM&A Manual.
3.2.
Figure
2.1 shows the locations of monitoring stations used during the reporting
period. Table 3.1 describes the details of the monitoring stations.
Table 3.1 Locations of Impact Air Quality
Monitoring Stations
|
Monitoring Station
|
Location
|
Description
|
|
AM1A
|
3
Sheung Wun Yiu
|
Ground
floor at the boundary outside Fan Sin Temple
|
|
AM2
|
12
Shan Tong New Village
|
Ground
floor outside the premise
|
|
AM3
|
Riverain
Bayside
|
Roof
of the switch room
|
|
AM4A
|
168
Shek Kwu Lung Village
|
Roof
of the switch room
|
3.3.
The
weather was mostly sunny, with
several fine, cloudy and rainy days
within the reporting period. The major dust source in the reporting
period included construction activities from Stage 1 of the Project, as well as
nearby traffic emissions.
3.4.
The
number of monitoring events and exceedances recorded in each month of the
reporting period are presented in Table 3.2 and Table 3.3 respectively.
Table 3.2 Summary
of Number of Monitoring Events for 1-hr & 24-hr TSP Concentration
|
Monitoring Parameter
|
Location
|
No. of monitoring events
|
|
Nov 11 – Oct 12
|
|
1-hr TSP
|
AM1A
|
192
|
|
AM2
|
192
|
|
AM3
|
192
|
|
AM4A
|
192
|
|
24-hr TSP
|
AM1A
|
64
|
|
AM2
|
64
|
|
AM3
|
64
|
|
AM4A
|
64
|
Table 3.3 Summary of Number of Exceedances for
1-hr & 24-hr TSP Monitoring
|
Monitoring Parameter
|
Location
|
Level of Exceedance
|
Level of Exceedance
|
|
Nov 11 – Oct 12
|
|
1-hr TSP
|
AM1A
|
Action
|
0
|
|
Limit
|
0
|
|
AM2
|
Action
|
0
|
|
Limit
|
0
|
|
AM3
|
Action
|
0
|
|
Limit
|
0
|
|
AM4A
|
Action
|
0
|
|
Limit
|
0
|
|
|
Total
|
0
|
|
24-hr TSP
|
AM1A
|
Action
|
0
|
|
Limit
|
0
|
|
AM2
|
Action
|
1
|
|
Limit
|
0
|
|
AM3
|
Action
|
0
|
|
Limit
|
0
|
|
AM4A*
|
Action
|
0
|
|
Limit
|
0
|
|
|
Total
|
1
|
3.5.
All
1-hour TSP results were below the Action and Limit Level at all monitoring
locations in the reporting period.
3.6.
All
24-hour TSP results were below the Limit Level at all monitoring locations in
the reporting period.
3.7.
One (1)
Action Level exceedance of 24-hour TSP monitoring was recorded on 2 August 2012
at AM2. From the information of EPD, the Air Pollution Index (API) at Tai Po
ranged from 54 to 91 with averaged 66 during the monitoring period. Excavation
works, removal works and temporary work for slope stabilization were carried
out on 1 August 2012 and 2 August 2012. The following dust mitigation measures
have been implemented by the Contract 1 Contractor (CSCE):
-
Maintaining the soil wet when loading and unloading;
-
Covering the loads of dump trucks;
-
Spraying water continually when breaking concrete; and
-
Erection of dust screen.
While the
abovementioned construction activities have been carried out since June 2012
with the dust mitigation measures implemented, no air quality monitoring
exceedance relating to Project works was recorded in previous monitoring works.
And the 24-hr TSP monitoring result on 8 August 2012 was 72.5 mg/m3 which was below action /
limit level. The dust exceedance was therefore considered not due to the Project
works. However, the Contractor was recommended to maintain implementation of
existing dust mitigation measures.
3.8.
The
graphical plots of the impact air quality monitoring results are provided in
Appendix D.
4.
4.1.
Construction
noise monitoring was conducted at 7 monitoring stations for at least once per
week during 07:00 – 19:00 in the reporting period.
4.2.
Figure
2.1 shows the locations of the monitoring stations used during the reporting
period. Table 4.1 describes the details of the monitoring stations.
Table
4.1 Locations of Impact Noise
Monitoring Stations
|
Monitoring
Station
|
Location
|
Description
|
|
NM1A
|
168 Shek Kwu Lung Village
|
1m from the exterior wall of the village house
|
|
NM2
|
38
Ha Wun Yiu
|
1.2m
from the ground floor free-field of the village house
|
|
NM3
|
Wong
Shiu Chi Middle School
|
1m from the
exterior of the roof top façade of the New Wing
|
|
NM4
|
Uptown
Plaza
|
1m
from the exterior of the roof top façade of Block 4
|
|
NM5
|
The
Paragon
|
1m from the
exterior of the roof top façade of the club house
|
|
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
|
4.3.
Major noise
sources during the noise monitoring included construction activities of Stage 1
of the Project and nearby traffic noise. In addition, for NM3 and NM6, general
school activities are also a potential noise source during the noise
monitoring.
4.4.
The number
of construction noise monitoring events and exceedances are summarized in Table
4.2 and Table 4.3 respectively.
Table 4.2 Summary of
Number of Monitoring Events for Construction Noise
|
Monitoring Parameter
|
Location
|
No. of monitoring events
|
|
Nov 11 – Oct 12
|
|
Construction Noise
|
NM1A
|
52
|
|
NM2
|
52
|
|
NM3
|
52
|
|
NM4
|
52
|
|
NM5
|
52
|
|
NM6
|
52
|
|
NM7
|
52
|
Table 4.3 Summary of Number of Monitoring
Exceedances for Construction Noise
|
Monitoring Parameter
|
Location
|
Level of Exceedance
|
Level of Exceedance
|
|
Nov 11 – Oct 12
|
|
Construction Noise
|
NM1A
|
Limit
|
0
|
|
NM2
|
0
|
|
NM3
|
0
|
|
NM4
|
0
|
|
NM5
|
0
|
|
NM6
|
0
|
|
NM7
|
0
|
|
|
Total
|
0
|
4.5.
All measured
construction noise levels were below the Limit level and the graphical plots of
the trends of the monitoring results are provided in Appendix E. Three
(3) Action Level exceedance of construction noise was recorded in the reporting
period.
4.6.
There were
three (3) noise related complaints followed up by Environmental Team in the
reporting period.
Investigations were carried out. The findings and the proposed mitigation measures were submitted to all
relevant parties. Summaries of
investigations are described in Section 7.1 of this report.
5.
5.1.
Site
Inspections were carried out on a weekly basis to monitor the implementation of
proper environmental pollution control and mitigation measures for Stage 1 of
the Project. In the reporting period, 53 and 52 site inspections were carried out for
Contract 1 and Contract 2 of the Project respectively.
5.2.
Particular
observations during the site inspections for Contract 1 are described below:
Air Quality
5.2.1.
Soil stockpile and exposed slope was found covered up
incompletely at central divider works area at NB2 and abutment NBSA. The
Contractor was reminded to cover the soil stockpile and exposed slope
completely.
5.2.2.
Exposed slope was dry and bunding was found missing along
the site boundary at W25. The Contractor was reminded to provide dust
suppression measures to minimize fugitive dust generation and provide sand
bag/bunds to intercept the surface run-off from works area.
5.2.3.
Exposed soil stockpile was observed stored up at S15. The
Contractor was reminded to cover up the exposed soil stockpile with tarpaulin
sheet to minimize the fugitive dust arising.
5.2.4.
Cement was observed on the ground at W8. The Contractor was
reminded to clear it up or spray water on the cement.
5.2.5.
Mud trails were observed at the site entrance in Gate 44.
The Contractor should clear the mud trails on the public road.
5.2.6.
Exposed slopes at NBWNA were not completely covered up by
tarpaulin sheet. The Contractor was reminded to cover up the exposed slopes
with tarpaulin sheet completely.
5.2.7.
Mud trails at the site entrance/exit at Gate 26 were
observed. Although, the mud trails were removed by worker immediately, the
Contractor should ensure that wheel washing facilities were operating at all
vehicular site entrances/exits to wash off the deposited silt on vehicles’
wheels and bodies and combine with cleaning of public roads wherever necessary
and practical. Proper drainage channels/bunds/wheel washing bay should be
provided to collect the run-off from wheel washing facilities
5.2.8.
Improper covering for a stock of cement bags (more than 20
bags) was observed at Area NB20. The Contractor was reminded to properly cover
every stock of more than 20 bags of cement / dry PFA by impervious sheeting or
placed in an area sheltered on the top and the 3 sides.
Noise
5.2.9.
Noise Emission Label (NEL) was found missing for the air
compressor at NB16. The Contractor was reminded to affix NEL to the air
compressor.
5.2.10. The absorptive
material wrapping to the breaking tip of the breakers working in works area were
found improper at Gate 44. The Contractor should provide proper absorptive
material wrapping to the breaking tips of the breakers working in works area to
minimize the noise impact.
5.2.11.
Valid noise emission label for air compressor at Bridge 10A
was observed missing. The Contractor was reminded to display a valid noise
emission label for the air compressor during operation.
Water Quality
5.2.12. Silty water and
waste was found accumulated along the site boundary at W4-7. The Contractor was
reminded to drain off the silty water and clear the waste.
5.2.13. Mud and cement
water were found accumulated inside the u-channel at Wall 8 and Bridge 10 East
Abutment respectively. The Contractor was reminded to clear the mud, cement
water and deposited cement inside the u-channel.
5.2.14. Muddy water was
found accumulated inside the sump pit at NB20. The Contractor was reminded to
clear the muddy water to avoid any substandard water flowing outside the works
area.
5.2.15. Slurry was found
accumulated inside the piling area at Gate 26. The Contractor should clear the
slurry regularly to avoid the slurry overflowing from the works area.
5.2.16. Broken sandbags
were observed at the site boundary of Gate 26. The Contractor was reminded to
replace the broken sandbags as soon as possible. The Contractor was recommended
to review the effectiveness of bunds/sand bags/channels at the site boundaries,
soil stockpile area and works areas regularly.
5.2.17. Stagnant water was
accumulated at Area NB16. The Contractor was reminded to remove the stagnant
water regularly. The Contractor was also recommended to maintain the drainage
system properly.
5.2.18. Broken sandbags
were observed near the entrance of Gate 26. The Contractor was reminded to
replace all broken sandbags and maintain the sandbag bunding properly to
prevent surface runoff from construction work flowing outside the work area and
discharging to public drain. Silt accumulated near the broken sandbags should
be removed as soon as possible to avoid any silty water discharging to nearby
gully. The Contractor was also recommended to review and maintain the
effectiveness of sandbag bunding regularly.
5.2.19. Oil drums were
observed placed on ground without drip tray at New Banyan West Bridge. The
Contractor was reminded to provide drip trays for all oil drums on site to
prevent oil leakage.
5.2.20. Silt was
accumulated near the gully at Area NB16. Although, sandbags were observed
provided at the gully, the Contractor was reminded to remove the silt
accumulated near the gully /u-channel and provide sufficient mitigation measure
(such as covering the gullies and other relevant measures) to prevent any silty
water runoff to public drain due to rainfall.
5.2.21. Stagnant water was
accumulated at NB20 near the site entrance/exit. The Contractor was reminded to
remove the stagnant water regularly.
Chemical and Waste Management
5.2.22. An oil drum and two
chemical containers were found placed on ground without drip tray at NB14-18
and Bridge 10A. The Contractor was reminded to provide drip tray to oil drum
and chemical containers on site.
5.2.23. Oil mixing with
water was found on ground at site entrance no.3. The Contractor was reminded to
clear the oil mixture.
5.2.24. Oil stains were
observed on the bare ground near NB1b and TB2.
Oil leakage was observed on ground from the power pack placed at jacking
pit. The Contractor was reminded to provide drip tray to retain any leaked oil.
Oil stain on ground should be cleared and disposed of as chemical waste.
5.2.25. Stockpile of empty
cement bags and general refuse were found under TB1 near Gate 3. The Contractor
was reminded to remove the empty cement bags and general refuse regularly and
disposed of properly.
5.2.26. Drain hole of drip
tray was unplugged on Bridge 10A. Drain hole of drip tray should be sealed up
to prevent chemical oil leakage from the chemical container.
5.2.27. Construction
materials were found accumulated on the Bridge 10A. The Contractor was reminded
to clear the construction materials on site. (Reminder)
5.2.28. Chemical container
was observed without chemical label at Wall 8. The Contractor was reminded to
affix the chemical label on the chemical container.
5.2.29. Oil stains were
found on ground at Bridge 11 and on ground near the breaking tip of breaker
under Bridge 11 near Gate 4. The Contractor was reminded to clear the oil
stains and dispose of as chemical waste. The Contractor was reminded to provide
tarpaulin sheet to the breaking tip to retain oil leakage.
5.2.30. Chemical containers
were observed placed on ground without drip trays at Gate 25 and Gate 26. The
Contractor was reminded to provide drip trays or equivalent measures for all
oil drums / chemical containers to intercept any oil / chemical leakage
occurred on site.
5.2.31. No drip tray
provided for a generator at Area NB16 was observed and oil leakage was also
found from the generator. The Contractor was reminded to provide drip tray for
the generator to retain any leaked oil. Oil stain on ground should be removed
and disposed as chemical wastes.
5.2.32.
Excavated mud was accumulated inside a drip tray underneath
an air compressor at Area NB16. The Contractor was requested to remove the mud
inside the drip tray and handle it as chemical wastes.
Landscape and Visual Impact
5.2.33. Metal wires were
found tied onto the retained tree near NB16. The Contractor was reminded to
remove the metal wires and do not use the retained tree as a physical support.
5.2.34. Sand was observed
accumulated around the retained trees and retained trees were not fenced off at
jacking pit. The Contractor was reminded to setup a tree protection zone and
provide proper protective measure to the retained trees on site.
5.2.35. Construction waste
was found placed near the retained tree under TB1 near Gate 3. The Contractor
was reminded to remove the construction waste and provide proper protective
measure to the retained tree.
Miscellaneous
5.2.36. Stagnant water was
found accumulated in the precast gully at NB14-18 and trench at NB27. The
Contractor was reminded to clear the stagnant water and provide mitigation
measures to prevent mosquito breeding.
5.2.37. Stagnant water was
found accumulated on ground at jacking pit, inside the drip tray near TB2 and
on Bridge 10A and inside the u-channel at Gate 3. The Contractor was reminded
to remove the stagnant water to avoid mosquito breeding and dispose of the
stagnant water inside the drip tray as chemical waste.
5.2.38. Stagnant water was
found accumulated inside the excavation area near W8 Bay 2-3 and inside the
drip tray at NB16 & Wall 8. The Contractor was reminded to remove the
stagnant water and dispose of as chemical waste.
5.2.39. Stagnant water was
accumulated in receiving pit and drip tray of oil drum at TB2 respectively. The
Contractor was reminded to remove the stagnant water in the receiving pit more
frequently. The Contractor was also reminded to remove the stagnant water
inside the drip tray as soon as possible and handle it as chemical wastes.
5.3.
Particular
observations during the site inspections for Contract 2 are described below:
Air Quality
5.3.1.
Access roads near RW71 and exposed slope near Gate 30 were
observed dry. The Contractor was reminded to spray water more frequently during
the dry season.
5.3.2.
Smoke was observed emitting from the roller at W72. The
Contractor was requested to repair and maintain the plant on site properly.
5.3.3.
Mud trails were found on ground at the exit point near NLKP
9. The Contractor was reminded to clear up the mud trails and provide measure
to ensure the vehicles bodies and wheels were kept clean of deposited silt
before leaving the site.
5.3.4.
Exposed soil surfaces/slopes were found at W66 and works
area near Gate no. 29. The Contractor was reminded to provide regular water
spraying or tarpaulin sheet coverage to the exposed soil surfaces/slopes to
minimize dust impacts.
5.3.5.
The Contractor was reminded to maintain and review the dust
suppression measure at W45-W46 and S37. (Reminder)
5.3.6.
Mud trails were found on ground at the exit point near NLKP
9 and Gate 2. The Contractor was reminded to clear up the mud trails and
provide measure to ensure the vehicles bodies and wheels were kept clean of
deposited silt before leaving the site.
5.3.7.
Dusty construction material was found placed on ground at
W65b. The Contractor was reminded to remove the dusty construction material to
avoid fugitive dust spreading.
5.3.8.
Exposed slope near Bridge 15 AP4 was incompletely covered
with tarpaulin sheet. The Contractor was reminded to cover up the exposed slope
with tarpaulin sheet completely or provide shotcreting to prevent generation of
silty surface run-off.
5.3.9.
Access roads were found dry at TW4. The Contractor was
reminded to provide frequent water spraying on the access roads to avoid
fugitive dust emission.
5.3.10. The Contractor was
reminded to provide regular water spraying or tarpaulin sheet coverage to the
exposed soil surfaces/slopes at NB42 to minimize dust impacts. (Reminder)
5.3.11. Mud trails were
observed on ground at the site entrance at S37. The Contractor should review
and maintain the wheel washing facilities provided at works area regularly to
ensure the deposited silt on vehicles’ wheels and bodies was washed off
effectively. Mus trails on the piblic road should be cleared.
5.3.12. Dry soil surface
was observed at S44. The Contractor was reminded to provide dust suppression
measure to the dry soil surface to avoid generation of fugitive dust.
5.3.13. Cement was observed
on ground in the works area and on the access road at Bridge 15A. The
Contractor was reminded to clear it up or spray water on the cement to prevent
generation of fugitive dust.
5.3.14. Insufficient dust
mitigation measure for broken concrete storage & concreting area next to
pedestrian bridge at Gate 15 was observed. The Contractor was reminded to
provide proper mitigation measures (such as erection tarpaulin sheet at work
areas, covering / dampening of stockpiles and broken concrete) to prevent any
dust emission generation and cause the air nuisance to public.
5.3.15. The Contractor was
reminded to cover the stockpiles at Area W56B by tarpaulin sheet after work.
Noise
5.3.16. Absorptive material
wrapping at the breaking tip at W38 works area should be improved. The
Contractor should wrap the breaking tip of the breaker completely before carry
out rock breaking works.
5.3.17. Sound insulation
material wrapping at the breaking tip at W65b should be improved. The
Contractor was advised to completely wrap the breaking tip of the breaker with
sound insulation materials.
5.3.18. Noise Emission
Label(NEL) was found missing for the generator employed in W56b. The Contractor
should affix the NEL to the generator within the works area.
Water Quality
5.3.19. Muddy water was
found on ground near Gate 30 and NLKP 9. The Contactor was reminded to clear
the muddy runoff; cover the slope with tarpaulin sheet or provide shotcreting
to the slope. Proper bunding should be provided along the boundary to intercept
surface runoff from flowing into the nearby public drainage.
5.3.20. Cement and C&D
waste was found accumulated inside the u-channel and plastic bag was found blocking
the entrance of the pipe at Link Bridge 1. The Contractor was reminded to clear
the cement and C&D waste and provide traps to intercept the silt and debris
before discharge.
5.3.21. Desilting facility
near Bridge 15 AP4 should be improved. The Contractor was recommended to
install additional inlet pipe to the sedimentation tank for the wastewater
collection from the desilting pit to prevent overflowing of untreated water
from the desilting pit in coming wet season.
5.3.22. Mud and silt
accumulated inside the u-channel and mud trails were observed on ground at
Bridge 15 AP4. The Contractor was recommended to clear the mud and silt inside
the u-channel and provide sufficient sand bags/bundings to intercept the muddy
surface run-off before discharge. Mud trail on ground should be cleared and
regularly review the drainage system to ensure the drainage system is properly
maintained.
5.3.23. Muddy water was
found discharging to the public drainage and loose sand bags were observed in
the catchpit at W51. The Contractor was recommended to provide additional sand
bags/bundings with shotcreting around the sump pit and additional sand
bags/bundings to the inlet and outlet of the catchpit. Also, the Contractor was
recommended to provide geotextile coverage on site boundary to prevent seepage
of surface run-off generated from works area. Temporary exposed slopes/surface
should cover up with tarpaulin sheet to minimize the generation of silty
run-off. Deposited silt and debris inside drainage in W51 should be cleared.
Muddy run-off should be diverted to desilting facility and closely monitor the
drainage system to ensure the drainage system is properly maintained. No
substandard surface run-off from construction site shall be discharge to public
drains.
5.3.24. Muddy surface
run-off was observed discharging outside the site area and sand bags/bundings
provided at the boundary of the work areas were insufficient at TW1, Link
Bridge 3 and Link Bridge 1 North Abutment. The Contractor should clear the mud
on ground and provide sufficient sand bags/bundings at the boundaries. Muddy
run-off should be directed to sedimentation tank to avoid generation of muddy
run-off overflowing outside the works area.
5.3.25. Accumulation of
silty water was observed inside the wheel washing bay at W71. The Contractor
was reminded to clear the deposited silt inside the wheel washing bay regularly
and maintain the wheel washing facilities properly.
5.3.26. Some leaves were
observed inside the u-channel at access to W35A. The Contractor was reminded to
remove the leaves inside the drainage channel to maintain the drainage system
properly.
5.3.27. Broken sand bags
were observed placed on ground near the public drainage at Bridge 12A. The
Contractor was reminded to replace the broken sand bags on ground.
5.3.28. Mud was found
accumulated inside the u-channel at S44. The Contractor was reminded to clear
the mud inside the u-channel and provide addition sand bags along the site
boundary to avoid overflowing of mud and substandard water from the works area.
5.3.29. Muddy water was
observed flowing outside to the public road from the gaps of water barrier near
the piling area at Bridge 15A Pier 6. The Contractor was reminded to align a
bunding or provide tarpaulin sheet at the footing of the water barrier to
divert the surface run-off to desilting facility.
5.3.30. Exposed soil stockpile
was observed at works area at Tai Wo Service Road West during rainstorm. The
Contractor was reminded to cover up the exposed soil stockpile with tarpaulin
sheet to minimize generation of silty run-off during rainstorm.
5.3.31. General refuse and
C&D materials were observed near the u-channel at S20. The Contractor was
reminded to remove the general refuse and C&D materials from the u-channel
and properly maintain the drainage system on-site.
5.3.32. Substandard run-off
was found discharging to the public drainage at NB42. The Contractor was
reminded to properly maintain and review the temporary drainage systems
provided within works area and ensure that run-off was properly desilted prior
to discharging to public drains. Any untreated run-off should be avoided from
overflowing to public drains.
5.3.33. Mud and broken
sandbags were observed on road at Gate 40. The Contractor was reminded to
remove the mud and replace the broken sandbags as soon as possible to prevent
any muddy water runoff from the construction work area to the public drain due
to rainfall. The Contractor was recommended to review the effectiveness of
sandbags regularly.
5.3.34. Mitigation measure
for exposed slope at W50 was observed insufficient. The Contractor was reminded
to cover the exposed slope properly to prevent any surface runoff to the nearby
public drain.
5.3.35. Oil drum and
chemical containers were placed on ground at Gate 16 without drip trays. The
Contractor was reminded to provide drip trays for all oil drums and chemical
containers to intercept any oil leakage.
5.3.36. Oil drum was
observed placed on ground at Area NLKP9 without drip tray. The Contractor was
reminded to provide drip tray or equivalent measures for all oil drums on site
to avoid any oil leakage occurred.
5.3.37. Oily water was
accumulated inside the drip trays at Area W45. The Contractor was reminded to
remove the oily water and handle it chemical waste. The Contractor was
recommended to remove the oily water / leaked oil inside the drip trays
regularly to prevent any overflow.
5.3.38. Stagnant water was
accumulated at Area W49. The Contractor was reminded to remove the stagnant
water more frequently and maintain the drainage system properly.
Chemical and Waste Management
5.3.39. Waste was observed
at material storage area near RW71. The Contractor was advised to store the
wastes in designated storage area. Waste should be disposed of regularly and
sorted properly. Waste inside the waste skip near RW71 was found mixing with
some recyclable waste, like woods and papers. The Contractor was reminded to
clear the waste and implement the waste sorting system properly.
5.3.40. Oil mixing with
water was observed on ground near NB42 and underneath the vehicle at Bridge 18.
The Contractor was reminded to clear the oily mixture and treat the oily
mixture as chemical waste.
5.3.41. Empty cement bags
were found accumulated near NLK Pier 9. The Contractor was reminded to clear up
the empty cement bag.
5.3.42. Deposited silt was
observed inside the water recycling tank at NLK Pier 9. The Contractor was
reminded to clear the deposited silt.
5.3.43. The drain hole of a
drip tray at work area TW1 was unplugged. The Contractor was reminded to seal
up the hole to prevent chemical oil leakage from the equipment.
5.3.44. C&D materials,
vegetation and excavated materials waste were found accumulated on ground at
Bridge 18 north abatement. The Contractor should clear up the C&D
materials, vegetation and excavated materials waste and sort out the recyclable
waste to keep the site in a tidy condition.
5.3.45. Oil stain was found
on ground underneath the air compressor and compressed air tank near NLKP 9.
The Contractor was reminded to clear the oil stain and check potential leakage
from containers and machineries.
5.3.46. Plants were found
stored up on bare ground at W65b. The Contractor was reminded to clear the
plants or place them on tarpaulin sheet to avoid oil leakage to the bare
ground.
5.3.47. Construction debris
was found accumulated on bridge deck and inside the waste skip at NLKP 3. The
Contractor was reminded to clear the construction debris on site. (Reminder)
5.3.48. Oil stains were
observed on the ground at NLKP 7. The Contractor was reminded to clear the oil
stains.
5.3.49. Two chemical
containers were placed on ground without drip tray at W38. The Contractor was
reminded to provide drip tray to the chemical containers on site.
5.3.50. Vegetation wastes
were found accumulated along the site boundary at W56. The Contractor was
reminded to clear up the vegetation wastes to keep the site in a tidy
condition.
5.3.51. Waste was observed
inside the drip tray at TW4. The Contractor was reminded to clear the waste
accumulated inside the drip tray.
5.3.52. The Contractor was
reminded to clear the construction waste regularly on Lam Kam Bridge.
(Reminder)
5.3.53. Breaking tip of
breaker was found placed on bare ground at S38. The Contractor was reminded to
place the breaking tip onto the tarpaulin sheet to avoid the oil leaked from
the breaking tip to the ground.
5.3.54. The drain hole of a
drip tray placed at Bridge 15A Pier 6 was unplugged. The Contractor was
reminded to seal up the drain hole to prevent oil leakage from the equipment.
5.3.55. Vegetation wastes
were found accumulated along the site boundary at W35A. The Contractor was
reminded to clear up the vegetation wastes to keep the site in a tidy
condition.
5.3.56. Recyclable waste
such as wood was found mixing with general refuse and construction material
inside the waste skip at W38. The contractor was reminded to sort out the
recyclable waste and clear the waste skip regularly.
5.3.57. Cans and bottles
were observed in site area at NB42. The Contractor was reminded to remove the
cans and bottles regularly. The Contractor was also reminded to maintain the
site cleanliness and tidiness.
5.3.58. The Contractor was
reminded to sort the general refuse, paper, plastic bottles and aluminum cans
at Area NLKB SA properly. The Contractor was also reminded to provide labels
for all recycling bins on site.
5.3.59. General refuse were
accumulated at Gate 30 and LB3 WA. The Contractor was reminded to dispose the
general refuse more frequently and provide sufficient receptacles for general
refuse collection on site. The Contractor was also reminded to maintain the
site cleanness and tidiness.
5.3.60. Breaking tip of
breaker was found placed on bare ground at Area NLKSA. The Contractor was
reminded to place the breaking tip onto the tarpaulin sheet to avoid the oil
leaked from the breaking tip to the ground
5.3.61. General refuse and
C&D waste were accumulated at NB 44. The Contractor was reminded to remove
the general refuse and C&D waste regularly and maintain the site tidiness
and cleanness.
Landscape and Visual Impact
5.3.62. Metal wire was
found tied onto the retained tree at RWB12B. The Contractor was reminded to
remove the metal wire and do not use the retained tree as a physical support.
5.3.63. Construction
material was found placed near the retained tree at NB44. The Contractor was
reminded to remove the construction material and provide proper protective
measure to the retained tree.
Miscellaneous
5.3.64. Stagnant water was
accumulated on ground under Bridge 15 and inside the u-channel along the site
boundary near W38 works area and the drip tray near W49. The Contractor was
reminded to clear the stagnant water to prevent mosquito breeding.
5.3.65. Stagnant water with
silt and weeds were observed inside the u-channel at S34 and accumulated inside
the drip trays of chemical containers on Lam Kam Bridge Pier 2 and TW2. The
Contractor was reminded to remove the stagnant water with silt and weeds inside
the drainage channel to maintain the drainage system properly. Also, sand bags
should be provided to intercept the silt to prevent muddy water discharge to
the public drainage. Stagnant water accumulated inside the drip trays should be
disposed of as chemical waste.
5.3.66. Stagnant water was
found accumulated inside the gullies and tyres on the bridge deck at Bridge
15A. The Contractor was reminded to remove the stagnant water.
5.3.67.
Stagnant water was accumulated inside the drip tray of
generator at W35A. The Contractor was reminded to clear the stagnant water and
handle it as chemical waste. The Contractor was also reminded to remove the
stagnant water inside the drip trays regularly to prevent any overflow
occurred. The Contractor was recommended to provide skirt curtains for drip
trays to prevent rainy water accumulated inside the drip tray during rainfall.
6
Summary AND REVIEW of
Non-compliance (Exceedances) of the Environmental Quality
6.
6.1.
No exceedance of Action and Limit Level was recorded for 1-hour
TSP monitoring in the reporting period.
6.2.
No exceedance of Limit Level was recorded for 24-hour TSP monitoring
in the reporting period
6.3.
One (1)
Action Level exceedance was recorded for 24-hour TSP monitoring at AM2 in the
reporting period. The dust exceedance was considered not due to the Project
works.
6.4.
No
Limit Level exceedance of construction noise monitoring was recorded in the
reporting period.
6.5.
There
were three (3) noise related complaints followed up by
Environmental Team in the reporting period, hence, three (3) Action Level exceedance of construction
noise was recorded in the reporting period.
Investigations were carried out.
The findings and the proposed mitigation measures were submitted to all relevant parties. Summary of
investigation is described in Section 7.1.
Summary
of Actions Taken in the event of Non-Compliance
6.6.
In the
event of non-compliance, actions were taken in accordance with the Event-Action
Plan in the updated EM&A Manual. Investigation was carried out within three
working days of identification of non-compliance, checking the implementation
status of the mitigation measures, etc. Assessments showed that the monitoring
exceedance was not due to the Project works and therefore no further action was
required to be taken.
7.
7.1.
Seven
(7) environmental complaints were followed up by Environmental Team in
the reporting period. Details of the
complaints are shown below:
7.1.1. EPD
referred a complaint about dust emission from construction site of the Tolo
Highway widening works near Ma Wo on 22 December 2011. Subsequently, the
complainant made another call on 29 December 2011 regarding the same issue. As
informed by the Contract 2 (HY2009/08 - Between Ma Wo and Tai Hang) Contractor,
Gammon Construction Ltd, of Stage 1 of the Project and confirmed by the
Engineer of the Project, demolition of haul road and slope excavation were
being carried out on 22 and 29 December 2011 respectively at the work area
nearby the residential flat of the complainant. Mitigation measures, including
watering of haul road by nominated direct labour and erection of the barrier as
a dust screen, were taken by the Contractor on the concerned days. With
reference to the monitoring results recorded on days near to the day of
complaint at the nearest monitoring station (AM1A- Sheung Wan Yiu) , the
24-hour TSP level on 19 December 2011 and 24 December 2011 was found to be
59.1ug/m3 and 107.9 ug/m3 respectively, which were below the action level of
176.6 ug/m3. Despite that the 24-hour TSP levels were below the action level,
the Contractor was recommended to carry out enhanced mitigation measures, like
providing dust net, extension of coverage of sprinkler system, informing the
complainant in advance of any dusty activities to be carried out and regularly
review the adequacy and effectiveness of dust suppression measure to suit the
construction progress.
7.1.2. A noise
related complaint was referred from HyD on 5 January 2012, the complainant (Mr.
Che) expressed that noise was generated from the construction site of Widening
of Tolo Highway near Ma Wo Tsuen on 23 December 2011. As informed by Contract 2
(HY2009/08 - Between Ma Wo and Tai Hang) Contractor, Gammon Construction Ltd,
of Stage 1 of the Project and confirmed by the Engineer of the Project, rock
breaking work was being carried out at the retaining wall W49 near Ma Wo Tsuen
on the concerned day. The noise was likely generated from the rock breaking
process. The Contractor provided mobile noise barrier at W49 and carried on the
rock breaking work. The complainant made another call regarding the same issue
on 31 December 2011. The rock breaking operation was suspended and all the
rocks were removed at the concerned area. The Contractor will erect additional
mobile noise barrier along W49 after the removal of rocks and prior to the rock
breaking operation. The Contractor was reminded to ensure the following noise
mitigation measures were implemented properly: provision of noise screening
measures at rock breaking works areas, e.g. erection of temporary noise
barriers; review the effectiveness of the noise mitigation measure to reduce
the noise level; and better scheduling of noisy construction activities to
minimize disturbance to nearby residents.
7.1.3. EPD
referred a complaint about insufficient dust suppression measure was provided
in the construction site of the Tolo Highway widening works near Ma Wo on 30
January 2012. As informed by the Contractor (Gammon Construction Ltd) and
confirmed by the Engineer of the Project, no substantial dusty construction
activity was being carried out on 30 January 2012 at the work area nearby the
residential flat of the complaint. During our weekly environmental site
inspection on 27 January 2012, water spraying was carried out to keep the slope
and haul road wet; dust net was erected along the site boundary and tarpaulin
sheet coverage and shotcreting was provided at W45-W46; vehicles were washed by
the wheel washing facilities at gate no. 2 before leaving construction site.
The complaint was considered as project related. Nevertheless, additional
mitigation measures will be undertaken by the Contractor, including
installation of
·
1 set of “water spray nozzle” at 4m above the
existing catchpit adjacent to the villager’s footway at the crest of the slope.
·
1 set of “water spray nozzle” on top of existing
dust screen, facing to the site haul road;
·
2 sets of “water spray nozzles” on top of site
container offices, facing to the site haul road;
·
4 sets of “water spray nozzles” at 4m above ground,
along “rock fall fence” / haul road opposite to RW W38; and
·
“Mist spray
nozzles” on top of existing dust screen along villager’s footway, at entrance
of Subways at up-stream.
All the above nozzles will be installed with “Auto timer”. Water will
spray in every 30 minutes and will be turn-off after 7:00pm. “Water spray
nozzles” were installing along the haul road and the slope from W45 to W47
during environmental site inspection on 2 February 2012. With reference to the
monitoring results recorded on days near to the day of complaint at the nearest
monitoring station (AM1A-Sheung Wan Yiu), the 24-hour TSP level on 26 January
2012 was found to be 58.7ug/m3, which was below the action level of 176.6
ug/m3. Despite that the 24-hour TSP levels were below the action level, the
Contractor was recommended and agreed that regularly review the adequacy and
effectiveness of dust suppression measure to suit the construction progress.
Follow-up site visit was conducted on 9 February 2012 to confirm the
implementation of mitigation measure. Mist spray nozzles were installed on the
top of the dust net. Water spraying was carrying out to keep the slope and haul
road wet. No fugitive dust was observed arising from the construction works at
the area.
7.1.4. EPD
refer a complaint about construction noise was generated from the construction
site of Widening of Tolo Highway near Ma Wo Tsuen on 22 February 2012 starting
from 8:30a.m. As informed by the Contractor (Gammon Construction Ltd) and
confirmed by the Engineer of the Project, excavation of base at retaining wall
W56 and fixing rebar of base slab at bay 11 at retaining wall W38 were being
carried out on 22 February 2012. The Contractor was reminded to carry out
mitigation measures, including informing the nearby residents in advance for
any noisy works to be carried out in the morning; erecting temporary noise
barriers fitted with noise absorbing materials at W56 and other noisy
construction works areas near Ma Wo Tsuen in the future; and regularly review
the adequacy and effectiveness of noise mitigation measure. Erection of
temporary noise barrier at W56 was implemented by the Contractor to minimize
the noise impact from the works area on 7 March 2012.
7.1.5. ICC
refer a complaint about noise nuisance generated by heavy machinery from the
construction site of Widening of Tolo Highway opposite to Wai Tau Tsuen near
Tai Wo Service Road West and Fanling Highway at the early morning on 20 March
2012. As informed by the Contractor (Gammon Construction Ltd) and confirmed by
the Engineer of the Project, erection of overhead falsework was being carried
out between New Lam Kam Flyover and Tai Wo Service Road West from 1:00 a.m. to
5:00 a.m. on 20 March 2012, a valid CNP(GW-RN0021-12) was granted for the
mentioned works. The noise was potentially generated from the safety alarm
system of aerial platform. The noise nuisance in the midnight is considered as
project related. Light alarm was adopted, instead of the sound alarm, since 21
March 2012. The Contractor was advised to implement the noise mitigation
measures, including strictly comply with the requirements of the approved CNP
for night-time works; adopt light alarm during implement night-time works; and
better scheduling of noisy construction activities to minimize disturbance to
nearby residents. Follow-up site visit was conducted on 5 April 2012 to confirm
the implementation of mitigation measure. Light alarm was adopted for safety
alarm system of the aerial platform.
7.1.6. For
the complaint received in September 2012, EPD referred a complaint (from a
resident at Ma Wo) about no water spraying was provided for construction
activities and caused dust emission in construction site of the Tolo Highway
widening works near Ma Wo on 20 September 2012. As informed by the Contractor
(Gammon Construction Ltd) and confirmed by the Engineer of the Project,
backfilling work and concreting work were being carried out on 20 September
2012 at the work areas (W45-47 & W40) nearby the residential flat of the
complainant. Mitigation measures, including erection of dust screen and water
spraying of haul road and exposed slope, were taken by the Contractor during
the construction activities.
With
reference to the monitoring results recorded on days near to the day of
complaint at the nearest monitoring station (AM1A- Sheung Wan Yiu), the 24-hour
TSP level on 17 September 2012 was found to be 47.8ug/m3, which was below the
action level of 176.6 ug/m3.
Nevertheless,
the complaint was considered as project-related. Therefore, the Contractor is
reminded to enhance the dust mitigation measures (e.g. sufficient water
spraying) during backfilling works to prevent any fugitive dust generation. The
Contractor should properly cover the non-working slopes and stockpiles by
tarpaulin. The Contractor is recommended to implement automatic water
sprinklers in site areas and increase the frequency of watering for haul road
and exposed slope. For future dusty construction works (such as rock breaking,
excavation, grouting, concreting and backfilling etc), the Contractor is
recommended to inform the complainant before dusty activities to be carried
out. The Contractor should review the adequacy and effectiveness of dust
suppression measures regularly to suit the construction progress.
As photo
records provided by the Contractor (Gammon Construction Ltd) on 21 September
2012, several dust mitigation measures (such as Tarpaulin sheet coverage for
exposed slope, dust screen along site boundary, auto-water sprinkler at site
haul road and exposed slope, continues water spraying at haul road / site area)
were implemented in the work areas W45-47 & W40.
Follow-up
site visit was conducted on 27 September 2012 to confirm the implementation of
mitigation measure. During the follow-up site inspection, no fugitive dust
generation arising from the construction works at the areas (W45-47 & W40)
was observed (dust screen along the site boundary had been erected; auto-water
sprinkler for water spraying of haul road had been implemented; exposed slope,
site haul road and stockpiles had been dampened)
7.1.7. For
the complaint received in October 2012, EPD referred a complaint (from a
resident at Ma Wo) on 9 October 2012 about dust emission in construction site
of the Tolo Highway widening works near Ma Wo on 8 October 2012, subsequently,
the complainant made another call on 15 October 2012 regarding the same issue.
As informed by the Contractor (Gammon Construction Ltd) and confirmed by the
Engineer of the Project, backfilling work was being carried out on 8 October
2012 and 15 October 2012 at the work areas W45-47 nearby the residential flat
of the complainant. Mitigation measures, including erection of dust screen
(dismantled on 13 October 2012 due to safety reasons and relocation of dust
screen conducted on 15 October 2012), automatic sprinkler system and manual
spraying by workers for haul road and exposed slope, covering non-working slope
by tarpaulin were taken by the Contractor.
With
reference to the monitoring results recorded on days near to the day of
complaint at the nearest EM&A monitoring station (AM1A- Sheung Wun Yiu),
the 24-hour TSP level on 5 October 2012, 11 October 2012 and 17 October 2012
were found to be 57.1ug/m3, 77.9ug/m3 and 84.1ug/m3 respectively, which were
below the action level of 176.6 ug/m3.
Nevertheless,
the complaint was considered as project-related. Therefore, the Contractor is
reminded to enhance the dust mitigation as below:
-
Enhance the dust mitigation measures (e.g. water
spraying) during backfilling works to prevent any fugitive dust generation;
-
Erect dust screen along at the work areas W45-47
before dusty activities to be carried out;
-
Increase the frequency of watering for haul road
and exposed soil stockpile (from every 10 minutes to every 7 minutes);
-
Cover the backfilling surface after work;
-
Extend the tarpaulin sheet covering area to the
exposed surface at lower part of non-working slope;
-
Cover the non-working slope by clean and proper
tarpaulin sheets;
-
Erect dust screen in backfilling area at W47;
-
Cover dusty material carrying by dump trucks by
mechanical cover even within the work area W45-47;
-
Maintain soil surface wet before loading and
unloading activities;
-
Review the adequacy and effectiveness of dust
suppression measures more frequently to suit the construction progress; and
-
Inform the complainant before dusty activities
to be carried out, such as rock breaking, excavation, grouting and backfilling
etc.
Follow-up
site visit was conducted on 1 November 2012 to confirm the implementation of
mitigation measure. During site inspection on 1 November 2012, no dusty
activity (i.e. loading and unloading activities) and dump truck was observed in
work area W45-47. Several dust mitigation measures were implemented at the work
area W45-47 as below:
-
Dust screen was erected along at the work area
W45-47;
-
Automatic sprinklers were operated for watering
of site haul roads / site areas;
-
Water spraying for site haul roads / site areas
was provided by worker;
-
Site haul road / site areas were dampened;
-
Tarpaulin sheet covering area was extended to
the exposed surface at lower part of non-working slope;
-
Non-working slopes was properly covered by
tarpaulin sheets; and
-
Impermeable sheet was erected in backfilling
area at W47.
Besides,
the Contractor’s site logs of environmental supervision and records of
communication between the Contractor and Ma Wo’s residents were also checked.
Dust suppression measures were provided at work areas W45-47 and the
deficiencies were also rectified properly. No fugitive dust arising from the
work area W45-47 was observed.
7.2.
No
notification of summons and prosecutions was received in the reporting period.
7.3.
Cumulative
statistics on complaints, notifications of summons and successful prosecutions
are summarized in Appendix F.
8.
8.1.
Only
one (1) 24-hour TSP monitoring exceedance was recorded in the reporting period
and it was considered not related to the Project works. All the rest of air
quality monitoring results in the reporting period were below the Action Levels
established in the baseline air quality monitoring carried out in October and
November 2009. The result was in line with the Environmental Impact Assessment
(EIA) and Environmental Review Report (ERR) prediction that dust generation
would be controlled and would not exceed the acceptable criteria, with proper
implementation of the recommended dust mitigation measures.
8.2.
No
construction noise monitoring exceedance was recorded in the reporting period.
This is generally in line with the EIA and ERR prediction that with the
implementation of noise mitigation measures, the construction noise from the
Project works will meet the stipulated criterion at the residential NSRs and at
a majority of the education institutions, except that elevated construction
noise level at Wong Shiu Chi Middle School (NM3) was predicted by the EIA and
ERR.
9.
9.1.
The
impact air quality and noise monitoring programme ensured that any
environmental impact to the receivers would be readily detected and timely
actions could be taken to rectify any non-compliance. The environmental monitoring results
indicated that the construction activities in general were in compliance with
the relevant environmental requirements and were environmentally acceptable. The
weekly site inspection ensured that all the environmental mitigation measures
recommended in the EIA/ERR were effectively implemented. Despite the minor
deficiencies found during site audits, the relevant contractor had taken
appropriate actions to rectify deficiencies within reasonable timeframe.
Therefore, the effectiveness and efficiency of the mitigation measures were
considered high in most of the time.
9.2.
For all
the parameters under monitoring as mentioned in Section 8, the measured levels
were in line with the EIA and ERR predictions generally. This indicates that
the mitigation measures were effectively implemented.
10
Review of EM&A Programme
10.
10.1.
The
environmental monitoring methodology was considered well established as the
monitoring results were found in line with the EIA predictions.
10.2.
As
effective follow up actions were promptly taken once exceedances were recorded,
no further exceedance occurred for each case. The EM&A programme was
considered successfully and adequately conducted during the course of the
reporting period.
11
Conclusions
11.
11.1. The construction phase and EM&A
programme of Stage 1 of the Project commenced on 23 November 2009.
11.2. Air quality and noise monitoring, and weekly
site inspections were carried out in the reporting period, in accordance with
the updated EM&A manual.
11.3. All 1-hour TSP monitoring results complied
with the Action / Limit Level in the reporting period. However, one (1) Action
Level exceedance of 24-hour TSP was recorded, but it was considered not related
to the Project works. No Limit Level exceedance of 24-hour TSP was recorded in
the reporting period.
11.4. There were three (3) noise related
complaints followed up by Environmental Team in the reporting period. Hence,
three (3) Action Level exceedances were recorded. No Limit Level exceedance for
construction noise was recorded at all monitoring stations in the reporting
period.
11.5. Seven (7) environmental complaints were followed up
by Environmental Team in the reporting period.
11.6.
No notification
of summons and prosecution was received in the reporting period.
11.7.
Mitigation measures had been implemented by the
Contractors to minimize the environmental impacts due to construction
activities. Site inspections carried out by ET and IEC showed that the
Contractors rectified the problems observed promptly and no major environmental
deficiency was induced. The EM&A
programme was considered successfully and adequately conducted during the
course of the reporting period.
