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 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 31 October 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;
-
Bridge jacking;
-
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; and
-
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..
Reporting Change
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 October 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;
- 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).
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 twenty-fourth monthly 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 October 2011.
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
|
9078 0458
|
2667 5666
|
|
Environmental Officer
|
Michael Tsang
|
9277 4956
|
2667 5666
|
|
Contractor
of Stage 1, Contract 2
(Gammon Construction Limited)
|
Site Agent
|
Edmond Chan
|
9483 8885
|
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:-
- Site
investigation;
- Temporary
shoring, sheetpiling and excavation;
- Bored
piling;
- Pre-bored
H-piles construction;
- Pipe
pile wall construction;
- Pile
cap construction;
- Bridge
construction;
- Bridge
jacking;
- 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; and
- 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, 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)
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 October 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 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
|
73.4
|
67.2 – 81.2
|
302.1
|
500
|
|
AM2
|
74.1
|
68.9 – 79.2
|
301.9
|
500
|
|
AM3
|
75.7
|
70.7 – 82.3
|
301.9
|
500
|
|
AM4A
|
73.9
|
65.4 – 81.7
|
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
|
26.4
|
15.9 – 41.3
|
176.6
|
260
|
|
AM2
|
22.9
|
15.2 – 35.8
|
178.6
|
260
|
|
AM3
|
29.9
|
19.2 – 37.8
|
193.1
|
260
|
|
AM4A
|
37.7
|
18.9 – 59.7
|
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 October 2011 from the Tai
Mei Tuk Automatic Weather Station were missing, the weather data from Tai Po
Automatic Weather Station in October 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 2238
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 – 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 October 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)
|
|
NM1A
|
62.3
|
62.2 – 62.6
|
75
|
|
NM2
|
66.9*
|
66.0 – 67.9*
|
75
|
|
NM3
|
62.2
|
48.5 – 64.4
|
70#
|
|
NM4
|
65.2
|
64.7 – 65.8
|
75
|
|
NM5
|
63.1
|
61.8 – 63.9
|
75
|
|
NM6
|
61.7*
|
51.2 – 64.4*
|
70#
|
|
NM7
|
57.5
|
50.0 – 59.0
|
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 4,
12, 19 and 26 September 2011 for
Contract 1 of the Project, and 4 site inspections for Contract 2 of
the Project were carried out on 7, 13, 20 and 27 October 2011.
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
Cement was observed on the ground
at Wall 4-7. The Contractor was reminded to clean up or spray water on the
cement.
4.1.5
Soil stockpile at site entrance
24 was observed dry. The Contractor was reminded to implement dust suppression
measure on the soil stockpile.
Noise
4.1.6
No adverse observation
was identified in the reporting month.
Water Quality
4.1.7
No adverse observation was identified in the reporting
month.
Chemical and Waste Management
4.1.8
Oil stains were observed on the
bridge surface at Bridge 11A. The Contractor was reminded to clear the oil
stains.
Landscape and Visual Impact
4.1.9
No adverse observation was identified in the reporting
month.
Miscellaneous
4.1.10
No adverse observation was identified in the reporting
month.
4.1.11 Particular observations
and reminder during the site inspections for Contract 2 are described below:
Air Quality
4.1.12
Exposed stockpile was not
completely covered with tarpaulin sheet at Bridge 15ASA and NLKP Pier 10. The
Contractor was reminded to fully cover the exposed stockpile with tarpaulin
sheet.
4.1.13
Access roads in W38 works area
was found dry. The Contractor was reminded to provide regular water spraying on
access roads within works area to minimize the dust impacts.
Noise
4.1.14
No adverse observation was identified in the reporting
month.
Water Quality
4.1.15
No muddy run-off discharge to
public drainage at 15AP4. However, deposited silt was found accumulated in
desilting pit at 15AP4. The Contractor was reminded to clear up deposited silt
and provide additional sand bags around the desilting pit to prevent
overflowing of untreated surface run-off.
4.1.16
Muddy water was found
accumulated on the ground under NLKP Pier 5. The Contractor was reminded to
clear the muddy water to prevent muddy water flowing to nearby public drainage.
4.1.17
Accumulation of silty water was
observed inside the u-channel along the site boundaries of W38 works area. The
Contractor was recommended to clear the deposited silt inside the u-channel
regularly and maintain the drainage channels properly.
Chemical and Waste Management
4.1.18
General refuse and C&D
materials were found accumulated inside the u-channel at Slope 41. The
Contractor was reminded to remove them from the u-channel and maintain the site
in a clean and tidy condition.
4.1.19
Stockpiles of used cement bags
were observed at W38 works area. The Contractor was reminded to clear the used
cement bags regularly and disposed of them properly.
Landscape and Visual Impact
4.1.20
No adverse observation was identified in the reporting
month.
Miscellaneous
4.1.21
Stagnant water was accumulated
on the bridge at NLKP Pier 5 and inside the drip tray near Gate 7. The
Contractor was reminded to clear the stagnant water to prevent mosquito
breeding.
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), 69m3 of inert C&D material was disposed as public fill to
Tuen Mun 38(of which 31m3 was broken concrete),
while 150m3 of general refuse were disposed at NENT
landfill. 39,168kg of metal, 166kg of paper/cardboard packaging and 3,600kg of plastic were
collected by recycling contractor in the reporting month. 6,537m3 and 5,006m3 of
inert C&D materials were reused on site and reused in NENT for backfilling
purpose respectively. 2,400kg of chemical
waste was collected by licensed contractor in the reporting period.
4.2.3
As advised by the Contract 2 Contractor (GCL), 105m3 of inert C&D
material were disposed to Tuen Mun 38 and 175m3
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-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-RN0222-11
|
30/6/2011
|
29/12/2011
|
CSHK
|
Construction of Bridge 10A and
11A
|
|
GW-RN0240-11
|
17/7/2011
|
14/1/2012
|
CSHK
|
Construction of TB1 & TB2
|
|
GW-RN0286-11
|
18/8/2011
|
17/2/2012
|
CSHK
|
Works next to MTRC's Tracks
|
|
GW-RN0315-11
|
7/9/2011
|
16/2/2012
|
CSHK
|
Construction of TB1 & TB2
- Nightime Work
|
|
GW-RN0337-11
|
15/9/2011
|
31/1/2012
|
CSHK
|
Routine Road Maintenance
|
|
GW-RN0349-11
|
25/9/2011
|
27/11/2011
|
CSHK
|
Road marking
alternation at Yuen Shin Road
|
|
GW-RN0361-11
|
1/10/2011
|
11/3/2012
|
CSHK
|
NB16 Construction
|
|
GW-RN0372-11
|
14/10/2011
|
13/4/2012
|
CSHK
|
W13 Construction Construction
|
|
GW-RN0391-11
|
21/10/2011
|
20/4/2012
|
CSHK
|
Construction of W4-7 & LKB
09
|
|
GW-RN0392-11
|
24/10/2011
|
7/12/2011
|
CSHK
|
Tree Felling at Tat Wan Road
|
|
GW-RN0149-11
|
21/5/2011
|
11/11/2011
|
GCL
|
Erection of Temporary Support
to Falsework for Construction of Bridge 18A
|
|
GW-RN0157-11
|
26/5/2011
|
19/11/2011
|
GCL
|
Removal of sign gantries at
TPTWR
|
|
GW-RN0238-11
|
1/9/2011
|
28/2/2012
|
GCL
|
Entire Site
|
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 November 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;
-
Bridge
jacking;
-
Tree
felling & transplantation;
-
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; and
-
Drainage
works.
5.1.2
The major construction works for Contract 2 in November 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 November 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;
-
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 November 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 October 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 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 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 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.
