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). 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 December 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..
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 Limit Level exceedance of construction noise was recorded in the
reporting month.
There was one (1) noise
related complaint followed up by Environmental Team in the reporting
period. Investigation was carried
out. The findings and the proposed
mitigation measures were submitted to all relevant parties. One (1) Action Level exceedance
of construction noise was recorded in the reporting month. Summary of
investigation is described in Section 4.6.2.
Complaint,
Notification of Summons and Successful Prosecution
There were one (1) air quality and one (1)
noise related complaints followed up by Environmental Team in December 2011. Investigation
was carried out. The findings and
proposed mitigation measures were submitted to all relevant parties. Summary of
investigation is described in Section 4.6.2.
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-sixth 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 December 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, 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)
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 December 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
|
78.3
|
73.2 – 83.2
|
302.1
|
500
|
|
AM2
|
78.5
|
74.3 – 83.7
|
301.9
|
500
|
|
AM3
|
78.0
|
74.6 – 82.2
|
301.9
|
500
|
|
AM4A
|
76.4
|
72.2 – 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
|
62.4
|
35.8 – 107.9
|
176.6
|
260
|
|
AM2
|
57.3
|
38.8 – 99.0
|
178.6
|
260
|
|
AM3
|
45.8
|
26.2 – 86.7
|
193.1
|
260
|
|
AM4A
|
80.3
|
44.0 – 136.3
|
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 December 2011 from the Tai Mei Tuk
Automatic Weather Station were missing, the weather data from Tai Po Automatic
Weather Station in December 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 December 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
|
61.5
|
58.8 – 64.0
|
75
|
|
NM2
|
65.6*
|
56.6 – 68.3*
|
75
|
|
NM3
|
63.4
|
58.4 – 64.7
|
70/65#
|
|
NM4
|
65.2
|
60.5 – 67.4
|
75
|
|
NM5
|
63.2
|
48.9 – 65.2
|
75
|
|
NM6
|
61.0*
|
51.2 – 64.2*
|
70#
|
|
NM7
|
64.2
|
58.1 – 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 monitoring result exceeding the Limit Level was
recorded at all monitoring stations in the reporting month.
3.7.3
There was one (1) noise related complaint followed up by
Environmental Team in the reporting period.
Investigation was carried out.
The findings and the proposed mitigation measures were submitted to all
relevant parties. One (1) Action Level exceedance of construction noise was recorded in the
reporting month. Summary of investigation is described in Section 4.6.2.
3.7.4
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.
3.7.5
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, 14,
21 and 28 December 2011 for Contract 1 of the Project, and 5 site
inspections for Contract 2 of the Project were carried out on 1, 7, 15, 21 and 29 December 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
No adverse observation was
identified in the reporting month.
Noise
4.1.5
No adverse observation was
identified in the reporting month.
Water
Quality
4.1.6
No adverse observation was
identified in the reporting month.
Chemical
and Waste Management
4.1.7
Two
chemical containers were placed on ground without drip tray at Bridge 10A. The
Contractor was reminded to provide drip tray to the chemical containers on
site.
Landscape
and Visual Impact
4.1.8
Metal wires were found
tied onto the retained tree near NB16. The Contractor was reminded to remove
the metal wires and do not use the retained tree as a physical support.
Miscellaneous
4.1.9
No adverse observation was
identified in the reporting month.
4.1.10 Particular observations and reminder during the site
inspections for Contract 2 are described below:
Air Quality
4.1.11
Smoke was observed
emitting from the roller at W72. The Contractor was requested to repair and
maintain the plant on site properly.
4.1.12
Mud trails were found on
ground at the exit point near NLKP 9. The Contractor was reminded to clear up
the mud trails and provide measure to ensure the vehicles bodies and wheels were
kept clean of deposited silt before leaving the site.
4.1.13
Exposed soil
surfaces/slopes were found at W66 and works area near Gate no. 29. The
Contractor was reminded to provide regular water spraying or tarpaulin sheet
coverage to the exposed soil surfaces/slopes to minimize dust impacts.
4.1.14
The Contractor was
reminded to maintain and review the dust suppression measure regularly at
W45-W46. (Reminder)
Noise
4.1.15
No adverse observation was
identified in the reporting month.
Water
Quality
4.1.16
Muddy runoff was found on
ground near NLKP 9. The Contractor was reminded to clear the muddy runoff and
provide preventive measures to prevent surface run-off discharge to the nearby
public drains.
4.1.17
Cement and C&D waste
was found accumulated inside the u-channel and plastic bag was found blocking
the entrance of the pipe at Link Bridge 1. The Contractor was reminded to clear
the cement and C&D waste and provide traps to intercept the silt and debris
before discharge.
Chemical
and Waste Management
4.1.18
Oil mixing with water was
found underneath the vehicle at Bridge 18.
The Contractor was reminded to clear the oily mixture.
4.1.19
C&D materials,
vegetation and excavated materials waste were found accumulated on ground at
Bridge 18 north abatement. The Contractor should clear up the C&D
materials, vegetation and excavated materials waste and sort out the recyclable
waste to keep the site in a tidy condition.
4.1.20
Oil stain was found on
ground underneath the air compressor and compressed air tank near NLKP 9. The
Contractor was reminded to clear the oil stain and check potential leakage from
containers and machineries.
4.1.21
Construction debris was
found accumulated on bridge deck and inside the waste skip at NLKP 3. The
Contractor was reminded to clear the construction debris on site. (Reminder)
Landscape and Visual Impact
4.1.22
No adverse observation was identified in the reporting
month.
Miscellaneous
4.1.23
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), 9m3
of inert C&D material was disposed as public fill to Tuen
Mun 38(of which 3m3 was broken concrete), while
273m3 of general refuse were disposed at NENT
landfill. 163kg of paper/cardboard
packaging was collected by recycling contractor in the reporting month. 6,337m3 and 6,897m3 of
inert C&D materials were reused on site and reused in NENT for backfilling purpose respectively. 1,000kg
of chemical waste was collected by licensed contractor in the reporting period.
4.2.3
As advised by the Contract
2 Contractor (GCL), 255m3 of inert C&D material were disposed to Tuen Mun 38 and 165m3 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-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
|
|
NCO
|
Construction Noise Permit
|
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-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
|
|
GW-RN0418-11
|
13/11/2011
|
29/4/2012
|
CSHK
|
Dismantling of Sign Gantry and Road Marking Alternation near W10 &
Bridge 11A
|
|
GW-RN0466-11
|
30/11/2011
|
19/5/2012
|
CSHK
|
Installation of Noise Panel from W8 to W10
|
|
GW-RN0482-11
|
18/12/2011
|
10/6/2012
|
CSHK
|
Cutting trees along Tolo Highway
|
|
GW-RN0493-11
|
15/12/2011
|
14/6/2012
|
CSHK
|
Loading & Unloading Along Tolo Highway
|
|
GW-RN0503-11
|
16/12/2011
|
21/1/2012
|
CSHK
|
Dismantling of Steel Protal Frame at Tat Wan
Road
|
|
GW-RN0516-11
|
25/12/2011
|
17/6/2012
|
CSHK
|
Drain laying next to S14
|
|
GW-RN0525-11
|
30/12/2011
|
15/6/2012
|
CSHK
|
Road Marking Alternation near Ma Wo &
W10
|
|
GW-RN0238-11
|
1/9/2011
|
28/2/2012
|
GCL
|
Entire Site
|
|
GW-RN0424-11
|
12/11/2011
|
29/02/2012
|
GCL
|
Erection of Temporary Falsework between Piers 5 and 6 of New Lam Kam Flyover
|
|
GW-RN0433-11
|
1/9/2011
|
29/02/2012
|
GCL
|
Removal of Existing Sign
Gantries Nsn 143 and Nsn
144 at Tolo Highway
|
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
There were one (1) air quality and one (1) noise related
complaints followed up by Environmental Team in December 2011.
EPD referred a complaint about dust emission from construction
site of the Tolo Highway widening works near Ma Wo on 22 December 2011. Subsequently, the complainant made
another call on 29 December 2011 regarding the same issue. As informed by the Contract 2
(HY2009/08 - Between Ma Wo and Tai Hang) Contractor, Gammon Construction Ltd, of Stage 1 of the Project and confirmed by the Engineer of the Project,
demolition of haul road and slope excavation were being carried out on 22 and
29 December 2011 respectively at the work area nearby the residential flat of
the complainant. Mitigation measures, including watering of haul road by
nominated direct labour and erection of the barrier as a dust screen, were
taken by the Contractor on the concerned days. With reference to the monitoring
results recorded on days near to the day of complaint at the nearest monitoring
station (AM1A- Sheung Wan Yiu) , the 24-hour TSP
level on 19 December 2011 and 24 December 2011 was found to be 59.1ug/m3
and 107.9 ug/m3 respectively, which were
below the action level of 176.6 ug/m3. Despite
that the 24-hour TSP levels were below the action level, the Contractor was
recommended to carry out enhanced mitigation measures, like providing dust net,
extension of coverage of sprinkler system, informing the complainant in advance
of any dusty activities to be carried out and regularly review the adequacy and
effectiveness of dust suppression measure to suit the construction progress.
A noise related complaint was referred from HyD on 5 January
2012, the complainant (Mr.
Che) expressed that noise was generated
from the construction site of Widening of Tolo Highway
near Ma Wo Tsuen on
23 December 2011. As informed by Contract
2 (HY2009/08 - Between Ma Wo and Tai Hang)
Contractor, Gammon Construction Ltd, of Stage 1 of the Project and confirmed by the Engineer of the Project, rock
breaking work was being carried out at the retaining wall W49 near Ma Wo Tsuen on the
concerned day. The noise was likely generated
from the rock breaking process. The Contractor provided mobile
noise barrier at W49 and carried on the rock breaking work. The complainant
made another call regarding the same issue on 31 December 2011. The rock
breaking operation was suspended and all the rocks were removed at the
concerned area. The Contractor will erect additional mobile noise barrier along
W49 after the removal of rocks and prior to the rock breaking operation. The Contractor was reminded to ensure the following noise
mitigation measures were implemented properly: provision of noise screening
measures at rock breaking works areas, e.g. erection of temporary noise
barriers; review the effectiveness of the noise mitigation
measure to reduce the noise level; and better
scheduling of noisy construction activities to minimize disturbance to nearby
residents.
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 January 2012 will be:-
-
Site investigation;
-
Temporary shoring, sheetpiling and excavation;
-
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 January
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 January 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 January 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 Limit Level exceedance for construction
noise was recorded at all monitoring stations in the reporting month.
6.1.5
There was one (1) noise related complaint followed up by
Environmental Team in the reporting period.
Investigation was carried out.
The findings and the proposed mitigation measures were submitted to all
relevant parties. One (1) Action Level exceedance of construction noise was recorded in the
reporting month.
6.1.6
Environmental site inspection was carried out 9
times in December 2011. Recommendations on remedial actions were given to
the Contractors for the deficiencies identified during the site audits.
6.1.7
There were one (1) air quality
and one (1) noise related complaints followed up by Environmental Team in the
reporting period. Investigation was carried out. The findings and the proposed
mitigation measures were submitted to all relevant parties.
6.1.8
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.
