EXECUTIVE SUMMARY
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) issued by EPD
on 23 December 2008.
Subsequently, EPD issued a Variation of Environmental Permit (EP-324/2008/A)
(VEP) on 31 January 2012.
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 Environmental Monitoring and
Audit (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 30 June 2012. As informed by the Contract 1 Contractor (China State Construction Engineering (Hong Kong) Ltd.), construction activities
in the reporting period were:-
-
Temporary Shoring, Sheetpiling
and Excavation
-
Pre-bored H-piles Construction
-
Pile Cap Construction
-
Bridge Construction
-
Tree Felling & Transplantation
-
At-grade Road Construction
-
Demolition of Central Dividers
-
Retaining Wall Construction
-
Slope works
-
Soil Nails Works
-
Noise Barrier Footing Construction and Panel
Installation
-
Road paving
-
Drainage works
The
construction works carried out by the Contract 2
Contractor (Gammon Construction Ltd.) in the reporting period were:-
-
Condition survey of existing structures;
-
Excavation of trial trenches to locate existing utilities;
-
Ground investigation and predrilling;
-
Construction of haul road;
-
Extension of box culvert and subway;
-
Piling and structural works of bridges;
-
Construction of pilecap / spread footing of noise barrier / semi noise enclosure;
-
Slope works, including installation of soil nails;
-
Retaining wall construction;
-
Noise barrier construction;
-
Modification of existing bridge structures;
-
Entrusted watermains works; 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
No Action/Limit Level exceedance
of construction noise was recorded in the reporting month.
Complaint, Notification of Summons and
Successful Prosecution
No
environmental complaint was followed up by Environmental Team in June 2012.
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, chemical
waste and waste management;
- Collection of
construction waste should be carried out regularly;
- Site runoff
should be properly collected and treated prior to discharge;
- Properly
maintain all drainage facilities and wheel washing facilities on site;
- Exposed slopes
should be covered up properly if no temporary work will be conducted;
-
Suppress dust generated from excavation, breaking and
drilling activities, haul road traffic and grout mixing process;
-
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
-
Tree protective measures for all retained trees should be
well maintained.
1.1.1.
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.
1.1.2.
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.
1.1.3.
The Project is a designated project and is governed
by an Environmental Permit (EP-324/2008)(EP) issued by EPD on 23 December 2008. Subsequently, EPD issued a Variation of Environmental Permit
(EP-324/2008/A) (VEP) on 31 January 2012.
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, 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.
|
1.1.5.
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 Tolo Highway between Island House Interchange and Ma Wo,
Contract 2 covers the section of Tolo Highway between
Ma Wo and Tai Hang.
1.1.7.
Hyder-Arup-Black and Veatch Joint Venture (HABVJV)
are appointed by Highways Department (HyD) 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).
1.1.8.
China State Construction Engineering (Hong Kong)
Ltd. (CSHK) 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.
1.1.9.
AECOM Asia Co. Ltd. was employed by HyD as the Environmental Team (ET) to undertake the Environmental
Monitoring and Audit (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.
1.1.10.
The construction phase of Stage 1 under the EP
commenced on 23 November 2009.
1.1.11.
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.
1.2.1
This is the thirty-first monthly EM&A Report under the
Agreement No. CE 20/2009 (EP) - Widening of Tolo Highway between Island House Interchange and Tai Hang
¨C 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 in June 2012.
1.3.1
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 Limited)
|
Independent Environmental Checker
|
Terence Kong
|
2828 5919
|
2827 1823
|
|
Contractor
of Stage 1, Contract 1
(China State Construction Engineering
(Hong Kong) Limited)
|
Site Agent
|
S.Y. Tse
(1 Jun 2012 ¨C 18 Jun 2012)
|
9078 0458
|
2667 5666
|
|
Eddie Tang
(19 Jun 2012 ¨C to date)
|
98637686
|
2667 5666
|
|
Environmental Officer
|
Michael Tsang
|
9277 4956
|
2667 5666
|
|
Contractor
of Stage 1, Contract 2
(Gammon Construction Limited)
|
Site Agent
|
John Chan
|
31261202
|
2559 3410
|
|
Environmental Officer
|
Ir Thomson Chang
|
9213 6569
|
2559 3410
|
|
ET of Stage 1
(AECOM Asia Company Limited)
|
ET Leader
|
Y T Tang
|
3922 9393
|
2371 7609
|
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 (China State Construction Engineering (Hong Kong) Ltd.)
in this reporting period are listed below:-
-
Temporary Shoring, Sheetpiling
and Excavation
-
Pre-bored H-piles Construction
-
Pile Cap Construction
-
Bridge Construction
-
Tree Felling & Transplantation
-
At-grade Road Construction
-
Demolition of Central Dividers
-
Retaining Wall Construction
-
Slope works
-
Soil Nails Works
-
Noise Barrier Footing Construction and Panel
Installation
-
Road paving
-
Drainage works
1.4.3 Details of the construction works carried out by the
Contract 2 Contractor (Gammon Construction Ltd.) in this reporting period are
listed below:-
-
Condition survey of existing structures;
-
Excavation of trial trenches to locate existing utilities;
-
Ground investigation and predrilling;
-
Construction of haul road;
-
Extension of box culvert and subway;
-
Piling and structural works of bridges;
-
Construction of pilecap / spread footing of noise barrier / semi noise enclosure;
-
Slope works, including installation of soil nails;
-
Retaining wall construction;
-
Noise barrier construction;
-
Modification of existing bridge structures;
-
Entrusted watermains works; 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 areas is
shown in Figure 1.1.
1.4.6 The environmental mitigation measures implementation schedule are
presented in Appendix C.
1.5.1 The EM&A programme required environmental
monitoring for air quality, noise and environmental site inspections for air
quality, water 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.
2.1.1
In accordance with the updated EM&A Manual, baseline
1-hour and 24-hour TSP levels at 4 air quality monitoring stations were
established. Impact 1-hour TSP monitoring was conducted for at least three
times every 6 days, while impact 24-hour TSP monitoring was carried out for at
least once every 6 days. The Action and Limit level of the air quality
monitoring is provided in Appendix D.
2.2.1
24-hour TSP air quality monitoring was performed using High
Volume Sampler (HVS) located at each designated monitoring station. The HVS
meets all the requirements of the updated EM&A Manual. Portable direct reading dust meters were
used to carry out the 1-hour TSP monitoring. Brand and model of the equipment is given
in Table 2.1.
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
and LD-3B)
|
|
High Volume Sampler
(24-hour TSP)
|
Tisch Total Suspended Particulate Mass
Flow Controlled High Volume Air Sampler (Model No. TE-5170
& GMW-2310)
|
2.3.1
Monitoring locations AM2 and AM3 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, baseline and impact air quality monitoring was conducted at 13
Ha Wun Yiu (AM1) and Tai Kwong
Secondary School (AM4) respectively. 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.
2.3.2
Figure 2.1 shows the locations of monitoring stations.
Table 2.2 describes the details of the monitoring stations.
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 Fan Sin Temple
|
|
AM2
|
12 Shan Tong New
Village
|
Ground floor outside
the premises
|
|
AM3
|
Riverain Bayside
|
Roof of the switch
room
|
|
AM4A
|
168 Shek Kwu
Lung Village
|
Roof of the switch
room
|
2.4.1
Table 2.3 summarizes the monitoring parameters, frequency
and duration of impact TSP monitoring.
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
|
2.5.1
24-hour TSP Monitoring
(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)
A minimum of 2 meters separation from any supporting
structure, measured horizontally.
(v)
No furnace or incinerator flues nearby.
(vi)
Airflow around the sampler was
unrestricted.
(vii)
Permission was obtained to set up the
samplers and access to the monitoring stations.
(viii)
A secured supply of electricity was
obtained to operate the samplers.
(ix)
The sampler was located more than 20
meters from any dripline.
(x)
Any wire fence and gate, required to
protect the sampler, did not obstruct the monitoring process.
(xi)
Flow control accuracy was kept within
¡À2.5% 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 25 ¡ãC
and not variable by more than ¡À3 ¡ãC;
the relative humidity (RH) was < 50% and not variable by more than ¡À5%. A
convenient working RH was 40%.
(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-5025A
Calibration Kit prior to the commencement of baseline monitoring. Bi-monthly
5-point calibration of the HVS will be carried out during impact monitoring.
(iii)
Calibration certificate of the HVSs are
provided in Appendix E.
2.5.2
1-hour TSP Monitoring
(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.
2.6
Monitoring Schedule for the Reporting Month
2.6.1
The schedule for environmental monitoring in June 2012
is provided in Appendix F.
2.7.1
The baseline condition of air quality in the
Project site was reviewed in October and November 2009. A baseline monitoring
of air quality, in terms of 1-hour Total
Suspended Particulates (TSP) and 24-hour TSP, was carried out from 20 October
2009 to 4 November 2009 for 14 days. The baseline monitoring report was
submitted by ETL and approved by the ER and the IEC on 9 November 2009. Action
Levels for air quality were established and are summarized in Table 2.4, Table
2.5 and Appendix D.
2.8.1
The monitoring results for 1-hour TSP and
24-hour TSP are summarized in Table 2.4 and 2.5 respectively. Detailed impact
air quality monitoring results are presented in Appendix G.
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
|
78.0
|
74.8 ¨C 82.3
|
302.1
|
500
|
|
AM2
|
78.7
|
75.9 ¨C 83.3
|
301.9
|
500
|
|
AM3
|
79.2
|
74.6 ¨C 84.2
|
301.9
|
500
|
|
AM4A
|
77.3
|
74.7 ¨C 82.3
|
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
|
20.5
|
13.5 ¨C 32.0
|
176.6
|
260
|
|
AM2
|
36.2
|
15.4 ¨C 76.8
|
178.6
|
260
|
|
AM3
|
26.9
|
21.0 ¨C 39.5
|
193.1
|
260
|
|
AM4A
|
27.5
|
20.2 ¨C 33.0
|
198.5
|
260
|
2.8.2
The major dust source in the reporting period
included construction activities from Stage 1 of the Project, as well as nearby
traffic emissions.
2.8.3
All 1-hour and 24-hour TSP results were below the Action
and Limit Level at all monitoring locations in the reporting month.
2.8.4
The event action plan is annexed
in Appendix J.
2.8.5
Weather information including wind speed and
wind direction is annexed in Appendix H. The information was obtained from Hong
Kong Observatory Sha Tin and Tai Mei Tuk Automatic Weather Station. As some of the weather data
in June 2012 from
the Tai Mei Tuk Automatic Weather Station were
missing, the weather data from Tai Po Automatic Weather Station in June 2012 are
included in Appendix H for supplementary purpose.
3.1.1
In
accordance
with the EM&A
Manual, impact noise monitoring was conducted for at least once per week during
the construction phase of Stage 1 of
the Project. The Action and
Limit level of the noise monitoring
is provided in Appendix D.
3.2
Monitoring Equipment
3.2.1
Noise monitoring was performed using sound level meter at
each designated monitoring station.
The sound level meters deployed comply with the International Electrotechnical Commission Publications (IEC) 651:1979
(Type 1) and 804:1985 (Type 1) specifications. Acoustic calibrator was deployed to
check the sound level meters at a known sound pressure level. Brand and model of the equipment is
given in Table 3.1.
Table 3.1 Noise
Monitoring Equipment
|
Equipment
|
Brand and Model
|
|
Integrated Sound Level
Meter
|
Rion
NL-31
|
|
Acoustic Calibrator
|
Rion
NC-73
|
3.3.1
Monitoring stations NM3, NM6 and NM7 were set up at the
proposed locations in accordance with updated EM&A Manual. However, for
monitoring locations: Tai Po Garden (NM1), Dynasty View (NM2), Hong Kong
Teachers¡¯ Association Lee Heng Kwei
Secondary School (NM4) and Grand Palisades (NM5), proposed in the updated
EM&A Manual, impact noise monitoring was conducted at alternative
monitoring locations, as approval of access could not be obtained from the
owner¡¯s corporation of the premises or the principal of the education
institutes. The monitoring station at Tai Kwong
Secondary School (NM1) was relocated to 168 Shek Kwu
Lung Village (NM1A) in September 2011.
3.3.2
Figure 2.1 shows the locations of the monitoring stations.
Table 3.2 describes the details of the monitoring stations.
Table 3.2 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
|
3.4.1
Table 3.3 summarizes the monitoring parameters, frequency
and duration of impact noise monitoring.
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
|
3.5.1
Monitoring Procedure
(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 1.2 m above
the ground for free-field measurements at NM2 and NM6.
(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 ¨C 1900 on normal weekdays; Leq(5-minutes) during restricted
hours i.e. 19:00 ¨C 23:00 and
23:00 ¨C 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 5m/s, or wind with gusts exceeding 10m/s.
3.5.2
Maintenance and Calibration
(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.
3.6.1
The schedule for environmental
monitoring in June 2012 is provided in Appendix F.
3.7.1
The monitoring results for construction noise are
summarized in Table 3.4 and the monitoring data is provided in Appendix I.
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)
|
|
NM1A
|
57.5
|
54.0 ¨C 59.7
|
75
|
|
NM2
|
65.8*
|
64.7 ¨C 67.3*
|
75
|
|
NM3
|
60.5
|
51.5 ¨C 64.7
|
65/70#
|
|
NM4
|
65.4
|
64.7 ¨C 66.1
|
75
|
|
NM5
|
62.6
|
51.9 ¨C 64.4
|
75
|
|
NM6
|
59.0*
|
53.0 ¨C 62.2*
|
65/70#
|
|
NM7
|
61.5
|
56.5 ¨C 63.5
|
75
|
*+3dB(A) Façade correction included
# Limit Level of 70dB(A) applies to education
institutes while 65dB(A) applies during school examination period.
3.7.2
No noise Action Level and Limit Level exceedance
was recorded at all monitoring stations in the reporting month..
3.7.3
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 major noise source during the noise
monitoring.
3.7.4
The event action plan is annexed in Appendix J.
4.1.1 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 month, 4 site inspections were carried out on 8, 13, 20
and 27 June 2012 for Contract 1 of
the Project, and 4 site inspections for Contract 2 of the Project were carried out
on 7, 14, 21 and 28 June 2012.
4.1.2 The
environmental site inspections summaries are provided in Appendix K.
4.1.3
Particular observations during the site
inspections for Contract 1 are described below:
Air Quality
4.1.4
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.
Noise
4.1.5
No adverse observation was identified in the
reporting month.
Water Quality
4.1.6
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.
Chemical and Waste Management
4.1.7
Chemical container
was observed without chemical label at Wall 8. The Contractor was reminded to
affix the chemical label on the chemical container.
4.1.8
Oil stains were
found on ground at Bridge 11. The Contractor was reminded to clear the oil
stains and dispose of as chemical waste.
Landscape and Visual Impact
4.1.9
No adverse observation was identified in the
reporting month.
Miscellaneous
4.1.10
Stagnant water was
found accumulated inside the drip tray at Wall 8. The Contractor was reminded
to remove the stagnant water inside the drip tray and dispose of as chemical
waste.
4.1.11 Particular
observations and reminder during the site inspections for Contract 2 are
described below:
Air Quality
4.1.12
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.
4.1.13
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.
Noise
4.1.14
No adverse observation was identified in the
reporting month.
Water Quality
4.1.15
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.
4.1.16
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.
4.1.17
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.
Chemical and Waste Management
4.1.18
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.
Landscape and Visual Impact
4.1.19 No
adverse observation was identified in the reporting month.
Miscellaneous
4.1.20
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.
4.2
Advice on the Solid and Liquid Waste
Management Status
4.2.1
The Contract 1 Contractor (CSHK) and the
Contract 2 Contractor (GCL) are registered as chemical waste producers for
Stage 1 of the Project. C&D material sorting was carried out on site.
Sufficient numbers of receptacles were available for general refuse collection.
4.2.2
As advised by the Contract 1 Contractor (CSHK),
1,062m3 of inert
C&D material was disposed as public fill to Tuen Mun 38(of which 3m3 was broken concrete), while
117m3
of general refuse was disposed at NENT landfill. 103kg of
paper/cardboard packaging and 2,445kg plastic were collected by recycling
contractor in the reporting month. 1,205m3 and 5,138m3
of inert C&D materials were reused on site and reused in NENT for
backfilling purpose respectively. No chemical waste was collected by licensed
contractor in the reporting period.
4.2.3
As advised by the Contract 2 Contractor (GCL), 180m3
of inert C&D material were disposed to Tuen Mun 38 and 725m3 general refuse was disposed to
NENT landfill in the reporting period.
4.2.4
The Contract 1 Contractor (CSHK) and the
Contract 2 Contractor (GCL) are advised to maintain on site waste sorting and
recording system and maximize reuse / recycle of C&D wastes.
4.3
Environmental Licenses and Permits
4.3.1
The environmental licenses and permits for Stage 1 of the
Project and valid in the reporting month is summarized in Table 4.1.
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
|
30/01/2012
(Superseded by by EP-324/2008/A
with effect from 31/01/2012)
|
HyD
|
Tolo Highway/Fanling
Highway between Island House Interchange and Ma Wo
|
|
EP-324/2008/A
|
31/01/2012
|
N/A
|
HyD
|
Tolo Highway/Fanling
Highway between Island House Interchange and Ma Wo
|
|
WPCO
|
Discharge License
(Office)
|
WT00005096-2009
|
03/12/2009
|
31/12/2014
|
CSHK
|
Discharge at Site
Office
|
|
Discharge License
(Site)
|
WT00005445-2009
|
15/12/2009
|
31/12/2014
|
CSHK
|
Discharge of
Construction Runoff
|
|
Discharge License
(Office)
|
WT00006782-2010
|
25/06/2010
|
30/06/2015
|
GCL
|
Discharge at Site
Office
|
|
Discharge License
(Site)
|
WT00007162-2010
|
09/08/2010
|
31/07/2015
|
GCL
|
Discharge of
Construction Runoff
|
|
WDO
|
Chemical Waste
Producer Registration
|
5213-727-C3249-46
|
25/09/2009
|
N/A
|
CSHK
|
Chemical waste
produced in Contract HY/2008/09
|
|
5213-722-G2347-18
|
18/05/2010
|
N/A
|
GCL
|
Chemical waste
produced in Contract HY/2009/08
|
|
WDO
|
Billing
Account for Disposal of
Construction Waste
|
7009328
|
08/09/2009
|
N/A
|
CSHK
|
Waste disposal in
Contract HY/2008/09
|
|
7010320
|
02/03/2010
|
N/A
|
GCL
|
Waste disposal in
Contract HY/2009/08
|
|
NCO
|
Construction Noise Permit
|
GW-RN0028-12
|
15/1/2012
|
14/7/2012
|
CSHK
|
TB1&2
Construction
|
|
GW-RN0049-12
|
1/2/2012
|
31/7/2012
|
CSHK
|
Routine Road
Maintenance
|
|
GW-RN0055-12
|
5/2/2012
|
15/7/2012
|
CSHK
|
Modification of
Sign Gantries along Tolo Highway
|
|
GW-RN0113-12
|
18/3/2012
|
9/9/2012
|
CSHK
|
NB16 Construction
|
|
GW-RN0170-12
|
6/4/2012
|
26/8/2012
|
CSHK
|
Noise Barrier Installation at Bridge 10A
|
|
GW-RN184-12
|
22/4/2012
|
21/10/2012
|
CSHK
|
Construction of W4 - NLKRB South Abutment
|
|
GW-RN0235-12
|
14/5/2012
|
5/7/2012
|
CSHK
|
Road resurfacing for Tolo Highway near
Island House
Interchange
|
|
GW-RN0251-12
|
26/5/2012
|
16/7/2012
|
CSHK
|
Road resurfacing for Tolo Highway near Shan
Tong New Village
and Grand Palisades
|
|
GW-RN0263-12
|
29/5/2012
|
7/7/2012
|
CSHK
|
Road marking alternation near NLKRM
|
|
GW-RN0272-12
|
31/5/2012
|
30/8/2012
|
CSHK
|
Works next to MTRC's Tracks
|
|
GW-RN0295-12
|
11/6/2012
|
17/8/2012
|
CSHK
|
Bridge 10A Stitch Concreting
|
|
GW-RN0308-12
|
23/6/2012
|
29/7/2012
|
CSHK
|
Road Paving in Tat Wan Raod Slip Road (Shatin Direction)
|
|
GW-RN0084-12
|
29/02/2012
|
28/08/2012
|
GCL
|
Entire site
|
|
GW-RN0094-12
|
04/03/2012
|
26/08/2012
|
GCL
|
Construction of Bridge 12A at Tolo Highway
|
|
GW-RN0183-12
|
03/05/2012
|
28/07/2012
|
GCL
|
Erection of Overhead Falsework Access for
Construction of Bridge 15A at Slip Road from Tolo
Highway Northbound to Tai Po Tai Wo Road near Tolo Highway
|
|
GW-RN0216-12
|
16/05/2012
|
16/06/2012
|
GCL
|
Dismantle of Overhead Falsework between
Piers 3 and 4 of the New Lam Kam Road Flyover
|
|
GW-RN0262-12
|
31/07/2012
|
07/09/2012
|
GCL
|
Construction of the slip Road of Tai Po Tai Wo
Road to Tolo Highway
|
|
GW-RN0297-12
|
15/06/2012
|
30/11/2012
|
GCL
|
A section of Tolo Highway (North bound) near
Shek Lin Road, Tai Po
|
4.4.1
In response to the site audit findings, the Contractors
carried out corrective actions.
4.4.2
A summary of the Implementation Schedule of
Environmental Mitigation Measures (EMIS) is presented in Appendix C. Most of
the necessary mitigation measures were implemented properly.
4.5
Summary of Exceedances
of the Environmental Quality Performance Limit
4.5.1
All 1-hour and 24-hour TSP monitoring results
complied with the Action / Limit Levels in the reporting period.
4.5.2
For construction noise, no Action and Limit Level
exceedance was recorded at all monitoring stations in
the reporting period.
4.6
Summary of Complaints, Notification of
Summons and Successful Prosecutions
4.6.1
The Environmental Complaint Handling Procedure
is annexed in Figure 4.1.
4.6.2
No environmental complaint was followed up by
Environmental Team in the reporting period.
4.6.3
No notification of summons and prosecution was
received in the reporting period.
4.6.4
Statistics on complaints, notifications of
summons and successful prosecutions are summarized in Appendix L.
5
FUTURE
KEY ISSUES
5.1.1
The major construction works for Contract 1 in July 2012 will
be:-
-
Temporary Shoring, Sheetpiling and
Excavation
-
Pre-bored H-piles Construction
-
Bridge Construction
-
Soil Nails Works
-
Slope works
-
At-grade Road Construction
-
Demolition of Central Dividers
-
Retaining Wall Construction
-
Noise Barrier Footing Construction and Panel Installation
-
Installation of Soil Nails
-
Road paving
-
Drainage works
5.1.2
The major construction works for Contract 2 in July 2012 will
be:-
-
Condition survey of existing structures;
-
Excavation of trial trenches to locate existing utilities;
-
Ground investigation and predrilling;
-
Construction of haul road;
-
Extension of box culvert and subway;
-
Piling and structural works of bridges;
-
Construction of pilecap / spread footing of noise barrier / semi noise enclosure;
-
Slope works, including installation of soil nails;
-
Retaining wall construction;
-
Noise barrier construction;
-
Modification of existing bridge structures;
-
Entrusted watermains works; and
-
Sewer Installation.
5.2
Key Issues for the Coming Month
5.2.1
Key issues to be considered in July 2012:-
-
Properly store and label oils and chemicals on site;
-
Chemical, chemical waste and waste management;
-
Collection of construction waste should be carried out regularly;
-
Site runoff should be properly collected and treated prior to
discharge;
-
Properly maintain all drainage facilities and wheel washing
facilities on site;
-
Exposed slopes should be covered up properly if no temporary work
will be conducted;
-
Suppress dust generated from excavation, breaking and drilling
activities, haul road traffic and
grout mixing process;
-
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
- Tree protective measures for all
retained trees should be well maintained.
5.3
Monitoring Schedule for the Coming Month
5.3.1
The tentative schedule for environmental
monitoring in July 2012 is
provided in Appendix F.
6.1.1
The construction phase and EM&A programme
of Stage 1 of the project commenced on 23 November 2009.
6.1.2
1-hour TSP, 24-hour TSP and noise monitoring were carried
out in the reporting period.
6.1.3
All 1-hour TSP and 24-hour TSP monitoring results complied
with the Action / Limit Level.
6.1.4
No Action
and Limit
Level exceedance for construction noise was recorded
at all monitoring stations in the reporting month.
6.1.5
Environmental site inspection was carried out 8 times in
June 2012. Recommendations
on remedial actions were given to the Contractors for the deficiencies
identified during the site audits.
6.1.6
No environmental complaint was followed up by Environmental Team in the
reporting period.
6.1.7
No notification of summons and prosecution was
received in the reporting period.
6.2.1
According to the
environmental site inspections performed in the reporting month, the following
recommendations were provided:-
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 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 Noise Emission Label (NEL) shall be affixed
to the air compressor and hand-held breaker operating within works area.
l Better scheduling of construction works to
minimize noise nuisance.
Water Quality Impact
l Silt, debris and leaves accumulated at
public drains, wheel washing bays and perimeter u-channels and desilting facilities should be cleaned up regularly.
l Silty effluent should be treated/desilted before discharged. Untreated effluent
should be prevented from entering public drain channel.
l Proper drainage channels/bunds should be
provided at the site boundaries to collect/intercept the surface run-off from
works areas.
l Exposed slopes and stockpiles should be
covered up properly during rainstorm.
l Stagnant water accumulated within works area
should be removed.
Chemical and Waste
Management
l C&D materials and wastes, general refuse
should be sorted properly and removed timely.
l All chemical containers and oil drums should
be properly stored.
l All plants and vehicles on site should be
properly maintained to prevent oil leakage.
l All drain holes of the drip trays utilized
within works areas should be properly plugged to avoid any 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.
