The
proposed widening of Tolo Highway and Fanling Highway between Island House
Interchange and Fanling (the Project) is a Designated Project under the
Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is governed by an Environmental Permit (EP-324/2008)(EP). The Project aims to widen 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 commenced on 23 November 2009.
The
EM&A programme for Stage 1 of the Project commenced on 23 November 2009.
The impact environmental monitoring and audit includes air quality and noise
monitoring.
This
report documents the findings of EM&A works conducted in the period between
1 and 31 July 2011. As informed by the Contract 1 Contractor (China State Construction Engineering (Hong Kong) Ltd.), construction activities
in the reporting period were:-
-
Site
investigation;
-
Temporary
shoring, sheetpiling and excavation;
-
Bored
piling;
-
Pre-bored
H-piles construction;
-
Pipe
pile wall construction;
-
Pile
cap construction;
-
Bridge
construction;
-
Tree
felling and transplanting of trees;
-
Installation
of soil nails;
-
At-grade
road construction;
-
Demolition
of central dividers;
-
Retaining
wall construction;
-
Slope
works;
-
Installation
of noise barrier; and
-
Road
paving.
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 July 2011.
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;
- Suppress
dust generated from excavation, breaking and drilling activities, and haul road
traffic;
- Quieter
powered mechanical equipment should be used;
- Closely check and
replace the sound insulation materials wrapped at the concrete breaker tip
regularly;
- Better scheduling
of construction works to minimize noise nuisance;
- Properly
maintain all drainage facilities and wheel washing facilities on site; and
- Tree protective measures
for all retained trees should be well maintained.
1.1.
Background
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).
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 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 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.
1.1.10.
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. Scope of Report
1.2.1.
This is
the twenty-first monthly Environmental Monitoring and Audit (EM&A) 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 in July 2011.
1.3. Project Organization
1.3.1. The project organization is shown in
Appendix A. The key personnel contact names and numbers are summarized in Table
1.1.
Table
1.1 Contact Information of Key
Personnel
|
Party
|
Position
|
Name
|
Telephone
|
Fax
|
|
ER of Stage 1, Contract 1
(Hyder-Arup-Black
& Veatch Joint Venture)
|
Chief Resident Engineer /TOLO1
|
James Tsang
|
9038 8797
|
26674000
|
|
ER of Stage 1, Contract 2
(Hyder-Arup-Black
& Veatch Joint Venture)
|
Chief Resident Engineer /TOLO2
|
Paul Appleton
|
9097 5833
|
2653 2348
|
|
IEC of Stage 1
(Mott MacDonald Hong Kong Limited)
|
Independent Environmental Checker
|
Terence Kong
|
2828 5919
|
2827 1823
|
|
Contractor
of Stage 1, Contract 1
(China State Construction Engineering
(Hong Kong) Ltd.)
|
Site Agent
|
David Lau
|
9499 0818
|
2667 5666
|
|
Environmental Officer
|
Michael Tsang
|
9277 4956
|
2667 5666
|
|
Contractor
of Stage 1, Contract 2
(Gammon Construction Ltd.)
|
Site Agent
|
Edmond Chan
|
9483 8885
|
2559 3410
|
|
Environmental Officer
|
Ir Thomson Chang
|
9213 6569
|
2559 3410
|
|
ET of Stage 1
(AECOM)
|
ET Leader
|
Y T Tang
|
3922 9393
|
2371 7609
|
1.4. Summary of Construction Works
1.4.1.
The construction phase of Stage 1 under the EP
commenced on 23 November 2009.
1.4.2.
Details
of the construction works carried out by the Contract 1 Contractor (China State
Construction Engineering (Hong Kong) Ltd.) in this reporting period are listed below:-
-
Site
investigation;
-
Temporary
shoring, sheetpiling and excavation;
-
Bored
piling;
-
Pre-bored
H-piles construction;
-
Pipe
pile wall construction;
-
Pile
cap construction;
-
Bridge
construction;
-
Tree
felling and transplanting of trees;
-
Installation
of soil nails;
-
At-grade
road construction;
-
Demolition
of central dividers;
-
Retaining
wall construction;
-
Slope
works;
-
Installation
of noise barrier; and
-
Road
paving.
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
mitigation measures implementation schedule are presented in Appendix C.
1.5. Summary of EM&A Programme Requirements
1.5.1.
The
EM&A programme required environmental monitoring for air quality, noise and
environmental site inspections for air quality, noise, waste management,
ecology, and landscape and visual impact. The EM&A requirements for each parameter
described in the following sections include:-
-
All monitoring parameters;
-
Monitoring schedules for the reporting month
and forthcoming months;
-
Action and Limit levels for all environmental
parameters;
-
Event / Action Plan;
-
Environmental mitigation measures, as
recommended in the Project EIA study final report; and
- Environmental requirement in contract
documents.
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
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)
|
2.3
2.3.1
Monitoring locations AM2 and AM3 were set up at the
proposed locations in accordance with updated EM&A Manual.
2.3.2
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.
2.3.3 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
|
|
AM4
|
Tai Kwong Secondary School
|
Roof of the school
|
2.4
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
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)
No furnace or incinerator flues nearby.
(v)
Airflow around the sampler was unrestricted.
(vi)
Permission was obtained to set up the samplers and
access to the monitoring stations.
(vii)
A secured supply of electricity was obtained to
operate the samplers.
(viii)
The sampler was located more than 20 meters from
any dripline.
(ix)
Any wire fence and gate, required to protect the
sampler, did not obstruct the monitoring process.
(x)
Flow control accuracy was kept within ±2.5%
deviation over 24-hour sampling period.
(b)
Preparation of Filter Papers
(i)
Glass fibre filters, G810 were labelled and
sufficient filters that were clean and without pinholes were selected.
(ii)
All filters were equilibrated in the conditioning
environment for 24 hours before weighing. The conditioning environment
temperature was around 25 °C
and not variable by more than ±3
°C; the relative humidity (RH) was < 50% and not variable by
more than ±5%. 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 July 2011 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 air quality monitoring
results are presented in Appendix G.
Table 2.4 Summary of 1-hour TSP Monitoring Results in the Reporting
Period
|
|
Average ((g/m3)
|
Range ((g/m3)
|
Action Level ((g/m3)
|
Limit Level ((g/m3)
|
|
AM1A
|
78.1
|
70.2 – 84.8
|
302.1
|
500
|
|
AM2
|
78.4
|
68.6 – 86.6
|
301.9
|
500
|
|
AM3
|
76.7
|
71.1 – 82.3
|
301.9
|
500
|
|
AM4
|
77.8
|
71.6 – 86.2
|
302.3
|
500
|
Table 2.5 Summary of 24-hour TSP Monitoring Results in the Reporting
Period
|
|
Average ((g/m3)
|
Range ((g/m3)
|
Action Level ((g/m3)
|
Limit Level ((g/m3)
|
|
AM1A
|
19.7
|
12.4 – 27.7
|
176.6
|
260
|
|
AM2
|
16.2
|
8.9 – 24.9
|
178.6
|
260
|
|
AM3
|
24.5
|
17.3 – 36.8
|
193.1
|
260
|
|
AM4
|
19.2
|
14.0 – 29.4
|
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 July 2011 from the Tai Mei Tuk Automatic Weather Station were
missing, the weather data from Tai Po Automatic Weather Station in July 2011
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
|
B&K (Model No.
2238)
|
|
Rion NL-31
|
|
Acoustic Calibrator
|
B&K (Model No.
4231)
|
|
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. 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
|
|
NM1
|
Tai Kwong Secondary School
|
1m from the exterior of the roof top façade of the
School
|
|
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 – 1900 on normal weekdays; Leq(5-minutes)
during restricted hours i.e. 19:00
– 23:00 and 23:00 – 07:00 of normal weekdays, whole day of Sundays and Public
Holidays
(e)
Prior to and after each noise measurement, the
meter was calibrated using the acoustic calibrator for 94dB(A) at 1000 Hz. If the difference in the calibration level
before and after measurement was more than 1 dB(A), the measurement would be
considered invalid and repeat of noise measurement would be required after
re-calibration or repair of the equipment.
(f)
During the monitoring period, the Leq, L10
and L90 were recorded. In
addition, site conditions and noise sources were recorded on a standard record
sheet.
(g)
Noise measurement was paused during periods of high
intrusive noise (e.g. dog barking, helicopter noise) if possible. Observations
were recorded when intrusive noise was unavoidable.
(h)
Noise monitoring was cancelled in the presence of
fog, rain, wind with a steady speed exceeding 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 July 2011 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)
|
|
NM1
|
62.4
|
52.7 – 64.6
|
70#
|
|
NM2
|
65.2*
|
54.8 – 67.7*
|
75
|
|
NM3
|
63.9
|
63.2 – 64.6
|
70#
|
|
NM4
|
65.8
|
64.8 – 67.0
|
75
|
|
NM5
|
63.3
|
60.1 – 64.6
|
75
|
|
NM6
|
62.7*
|
53.0 – 66.4*
|
70#
|
|
NM7
|
62.8
|
58.6 – 67.2
|
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.
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 7, 13,
20 and 27 July 2011 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 July 2011.
4.1.2 The environmental
site inspection summaries are provided in Appendix K.
4.1.3 Particular
observations and reminder during the site inspections for Contract 1 are
described below:
Air Quality
4.1.4
Slightly smoky emission was observed from an excavator
working at Wall 10. The Contractor was reminded to conduct regular maintenance of
the machineries working on site to avoid any dark smoke emission. (Reminder)
Noise
4.1.5
Noise Emission Label (NEL) was found missing for the air
compressor at Bridge 10A West Abutment.
The Contractor was reminded to affix NEL to the air compressor.
Water Quality
4.1.6
No adverse observation was identified in the reporting
month.
Chemical and Waste Management
4.1.7
No adverse observation was identified in the reporting
month.
Landscape and Visual Impact
4.1.8
No adverse observation was identified in the reporting
month.
Miscellaneous
4.1.9
No adverse observation was identified in the reporting
month.
4.1.10 Particular
observations during the site inspections for Contract 2 are described below:
Air Quality
4.1.11
No adverse observation was identified in the reporting
month.
Noise
4.1.12
No adverse observation was identified in the reporting
month.
Water
Quality
4.1.13
Accumulation of silty water was observed inside the wheel
washing bays provided in Retaining Wall W65 works area. The Contractor was reminded
to clear the deposited silt inside the wheel washing bays regularly and
maintain the wheel washing facilities properly.
Chemical and Waste Management
4.1.14
Waste inside the waste skips near work area RW72 and S29
were found mixing with some recyclable waste, like aluminum cans, cardboards
and plastic bottles. The Contractor was reminded to implement the waste sorting
system properly and convey the message to the sub-contractors.
4.1.15
A hole was found on a drip tray at work area S29. The Contractor was reminded to seal up the
hole before placing chemical inside the drip tray.
Landscape and Visual Impact
4.1.16
No adverse observation was identified in the reporting
month.
Miscellaneous
4.1.17
No adverse observation was identified in the reporting month.
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), 136m3
of inert C&D material was disposed as public fill to Tuen Mun 38 (of which
6m3 was broken concrete), while 150m3 of general refuse
were disposed at NENT landfill, 27kg of
metal, 140kg of paper/cardboard packaging and 13kg of plastic were collected by
recycling contractor in the reporting month. 6,246m3 and 15,415m3
of inert C&D materials were reused on site and reused in NENT for backfilling
purpose respectively in the reporting period.
4.2.3
As advised by the Contract 2 Contractor (GCL), 415m3
of inert C&D material were disposed to Tuen Mun 38 and 180m3 of
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
|
N/A
|
HyD
|
Tolo Highway/Fanling Hignway
between Island House Interchange and Ma Wo
|
|
WPCO
|
Discharge License (Office)
|
WT00005096-2009
|
03/12/2009
|
31/12/2014
|
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
|
|
|
|
GW-RN0026-11
|
26/1/2011
|
16/7/2011
|
CSHK
|
Construction of TB1 & TB2
|
|
|
|
GW-RN0096-11
|
1/4/2011
|
24/9/2011
|
CSHK
|
Works next to MTRC’s Tracks
|
|
|
|
GW-RN0113-11
|
18/4/2011
|
17/10/2011
|
CSHK
|
Construction of W4-7 & LKB
|
|
NCO
|
Construction Noise Permit
|
GW-RN0122-11
|
26/4/2011
|
25/10/2011
|
CSHK
|
Construction of W8 &
LKB-South
|
|
|
|
GW-RN0133-11
|
1/5/2011
|
31/7/2011
|
CSHK
|
Road maintenance
|
|
|
|
GW-RN0172-11
|
3/6/2011
|
16/8/2011
|
CSHK
|
Construction of TB1 & TB2
|
|
|
|
GW-RN0204-11
|
20/6/2011
|
14/12/2011
|
CSHK
|
Loading and Unloading along
Tolo Highway
|
|
|
|
GW-RN0205-11
|
26/6/2011
|
11/12/2011
|
CSHK
|
Cutting trees along Tolo
Highway
|
|
NCO
|
Construction Noise Permit
|
GW-RN0219-11
|
30/6/2011
|
15/7/2011
|
CSHK
|
Dismantling of Steel Portal
Frame at Shan Tong Road
|
|
GW-RN0222-11
|
30/6/2011
|
29/12/2011
|
CSHK
|
Construction of Bridge 10A and
11A
|
|
GR-RN0225-11
|
10/7/2011
|
25/9/2011
|
CSHK
|
Construction of Site Entrance
and Erection of Catch Fence at NB16
|
|
GW-RN0240-11
|
17/7/2011
|
14/1/2012
|
CSHK
|
Construction of TB1 & TB2
|
|
GW-RN0242-11
|
21/7/2011
|
29/9/2011
|
CSHK
|
Road Resurfacing for traffic
diversion
|
|
GW-RN0040-11
|
1/3/2011
|
31/8/2011
|
GCL
|
Entire Site
|
|
GW-RN0098-11
|
1/4/2011
|
30/9/2011
|
GCL
|
Erection of Overhead Falsework
between Piers 3
|
|
GW-RN0109-11
|
19/4/2011
|
15/10/2011
|
GCL
|
Erection / Dismantlement of
Overhead Falsework and Dismantlement
of Existing Sign Gantry at Tolo
Highway
|
|
GW-RN0149-11
|
21/5/2011
|
11/11/11
|
GCL
|
Erection of Temporary Support to
Falsework for Construction of Bridge 18A
|
|
GW-RN0157-11
|
26/5/2011
|
19/11/11
|
GCL
|
Removal of sign gantries at
TPTWR
|
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 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 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 August 2011
will be:-
-
Site
investigation;
-
Temporary
shoring, sheetpiling and excavation;
-
Bored
piling;
-
Pre-bored
H-piles construction;
-
Pipe
pile wall construction;
-
Pile
cap construction;
-
Bridge
construction;
-
Tree
felling & transplanting of trees;
-
Installation
of soil nails;
-
At-grade
road construction;
-
Demolition
of central dividers;
-
Retaining
wall construction;
-
Slope
works;
-
Noise
barrier footing construction; and
-
Road
paving.
5.1.2
The major construction works for Contract 2 in August 2011
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 August 2011:-
-
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;
-
Suppress dust generated from excavation,
breaking and drilling activities, and haul road traffic;
-
Quieter powered mechanical equipment should
be used;
- Closely
check and replace the sound insulation materials wrapped at the concrete
breaker tip regularly;
- Better
scheduling of construction works to minimize noise nuisance;
-
Properly maintain all drainage facilities and
wheel washing facilities on site; 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
August 2011 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 noise was recorded
at all monitoring stations in the reporting month.
6.1.5
Environmental site inspection was carried out 8 times in
July 2011. 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 inspection 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 Ensure all vehicles to be washed before
leaving the site.
l Provide water
spraying to suppress fugitive dust for any dusty construction activity.
Construction Noise Impact
l Properly erect the temporary noise barriers
in accordance with the Environmental Permit requirement.
l Noise barriers should be closely packed and
properly aligned to ensure effective noise reduction.
l Noisy operations should be oriented to a
direction away from sensitive receivers as far as possible.
l Sound insulation materials shall be wrapped at the breaker tip for concrete breaking works.
l 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 Stagnant water accumulated in drip trays
should be removed.
l Silt, debris and leaves accumulated at
public drains, wheel washing bays and perimeter u-channels should be cleaned up
regularly.
l Silty effluent should be treated/desilted
before discharged. Untreated effluent should be prevented from entering public
drain channel.
Chemical and Waste
Management
l C&D materials and wastes should be
sorted 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 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.
