The
proposed widening of Tolo Highway and Fanling Highway between Island House
Interchange and Fanling (the Project) is a Designated Project under the
Environmental Impact Assessment Ordinance (Cap. 499) (EIAO) and is governed by an Environmental Permit (EP-324/2008)(EP) issued by EPD
on 23 December 2008.
Subsequently, EPD issued a Variation of Environmental Permit (EP-324/2008/A)
(VEP) on 31 January 2012.
The
Project aims to widen Tolo Highway and Fanling Highway
to dual 4-lane carriageway in order to alleviate the current traffic congestion
problems and to cope with the increasing transport demands to and from the
urban areas and also cross boundary traffic.
The
construction works for this Project will be delivered in 2 stages i.e. Stage 1
(between Island House Interchange and Tai Hang) and Stage 2 (between Tai Hang
and Wo Hop Shek Interchange). The construction works of Stage 1 were commenced
on 23 November 2009 and will tentatively be completed in December 2013; while
construction programme of Stage 2 is currently under review. This report
focuses on Stage 1 of the Project only.
The
construction phase of Stage 1 under the EP and the Environmental Monitoring and
Audit (EM&A)
programme for Stage 1 of the Project commenced on 23 November 2009. The impact
environmental monitoring and audit includes air quality and noise monitoring.
This report documents the
findings of EM&A works conducted in the period between 1 and 31 May 2013.
As informed by the Contract 1 Contractor (China State
Construction Engineering (Hong Kong) Ltd.), construction activities in the
reporting period were:-
-
Temporary shoring, sheetpiling and excavation
-
Pile cap construction (Noise Barrier)
-
Installation of soil nails
-
At-grade road construction
-
Widening and demolition of central dividers
-
Retaining wall construction
-
Noise barrier footing construction
-
Noise barrier panels installation
-
Asphalt laying
-
Installation of Drainage Pipes
-
Modification of Edge coping
The
construction works carried out by the Contract 2
Contractor (Gammon Construction Ltd.) in the reporting period were:-
-
Condition survey of existing structures
-
Initial and record survey
-
Survey Setting out works for slopes and structures
-
Setting up the temporary traffic arrangement
-
Excavation of trial trenches to locate existing utilities
-
Construction of haul road
-
Extension of box culvert and subway
-
Structural works of bridges
-
Construction of Pilecap / Spread footing of Noise Barrier / Semi
Noise Enclosure
-
Slope works, including installation of soil nails
-
NTHA mitigation works
-
Retaining wall construction
-
Noise barrier construction
-
Modification / Demolition of existing bridge structures
-
Entrusted watermains works
-
Sewer Installation
-
Road and drainage works
-
Landscaping works
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 Level exceedance of construction noise was recorded in the
reporting month, since no noise complaints related to 0700 ¨C
1900 hours on normal weekdays was received and followed by Environmental Team
in the reporting month.
No Limit Level exceedance of construction noise was
recorded in the reporting month.
Complaint, Notification of Summons and
Successful Prosecution
There was one (1) complaint (included one (1) air
related complaint) received on 25 April 2013 and followed up by Environmental
Team in May 2013. Investigation of the air related complaint was carried out
and the findings and proposed mitigation measures were submitted to all
relevant parties. Summary of investigation is described in Section 4.6.3.
No new complaint, 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
other major strategic routes to Shenzhen. At present, this section of Route 9 is
dual 3-lane carriageway. However, at several major interchanges along this
section of Route 9, the highway is only dual-2 lane. Severe congestion is a
frequent occurrence during peak periods, particularly in the Kowloon bound
direction.
1.1.2.
The objective of the Project ¡°Widening
of Tolo Highway / Fanling Highway between Island House Interchange and Fanling¡±
is to widen Tolo Highway and Fanling Highway to dual 4-lane carriageway in
order to alleviate the current traffic congestion problems and to cope with the
increasing transport demands to and from the urban areas and also cross
boundary traffic.
1.1.3.
The Project is a designated project and
is governed by an Environmental Permit (EP-324/2008)(EP) issued by EPD on
23 December 2008. Subsequently, EPD issued a Variation of Environmental Permit
(EP-324/2008/A) (VEP) on 31 January 2012.
1.1.4.
The scope of the Project comprises
mainly:-
|
(i)
|
Widening
of a 5.7 km section of Tolo Highway and 3.0 km section of Fanling Highway
between Island House Interchange and Wo Hop Shek Interchange from the
existing dual 3-lane to dual 4-lane, including construction of new vehicular
bridges;
|
|
(ii)
|
Widening
of interchange sections at Island House Interchange, Tai Po North
Interchange, and Lam Kam Road Interchange from dual 2-lane to dual 3-lane,
except Sha Tin bound carriageway at Tai Po North Interchange, which is
widened from 3-lane to 4-lane, including realignment of various slip roads;
|
|
(iii)
|
Modification
and reconstruction of highways, vehicular bridges, underpasses and
footbridges.
|
1.1.5.
The construction works for this Project
will be delivered in 2 stages i.e. Stage 1 (between Island House Interchange
and Tai Hang) and Stage 2 (between Tai Hang and Wo Hop Shek Interchange). The
construction works of Stage 1 commenced on 23 November 2009 and will
tentatively be completed in December 2013; while construction
programme of Stage 2 is currently under review. This report focuses on Stage 1
of the Project only.
1.1.6.
The construction works for Stage 1 of the
Project will be implemented under 2 works contracts (Contract 1 and Contract
2). Contract 1 covers the section
of Tolo Highway between Island House Interchange and Ma Wo, Contract 2 covers
the section of Tolo Highway between Ma Wo and Tai Hang.
1.1.7.
Hyder-Arup-Black and Veatch Joint
Venture (HABVJV) are appointed by Highways Department (HyD) as the consultants
for the design and construction assignment for the Tolo project under Agreement
No. CE 58/2000 Supplementary Agreement No. 3 (SA3) (i.e. the Engineer for the
Contracts).
1.1.8.
China State Construction Engineering
(Hong Kong) Ltd. (CSHK) was commissioned as the Contractor of Contract 1 of
Stage 1 of the Project, while Gammon Construction Limited (GCL) was
commissioned as the Contractor of Contract 2 of Stage 1 of the Project.
1.1.9.
AECOM Asia Co. Ltd. was employed by HyD
as the Environmental Team (ET) to undertake the Environmental
Monitoring and Audit (EM&A) works
for Stage 1 of the Project and Mott MacDonald Hong Kong Ltd. acts as the
Independent Environmental Checker (IEC) for the Contracts.
1.1.10.
The construction phase of Stage 1 under
the EP commenced on 23 November 2009.
1.1.11.
According to the updated EM&A
Manual of Stage 1 of the Project, there is a need of an EM&A programme
including air quality and noise monitoring. The EM&A programme for Stage 1
of the Project commenced on 23 November 2009.
1.2.1
This is the forty-third monthly EM&A Report
under the Agreement No. CE 20/2009 (EP) - Widening of Tolo Highway between
Island House Interchange and Tai Hang ¨C Investigation. This report presents a summary of the
environmental monitoring and audit works, list of activities and mitigation
measures proposed by the ET for Stage 1 of the Project in May 2013.
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
|
Eddie Tang
|
9863 7686
|
2667 5666
|
|
Environmental Officer
|
Ken Cheung
|
9803 5297
|
2667 5666
|
|
M L Lam
|
9489 4641
|
2667 5666
|
|
Contractor of
Stage 1, Contract 2
(Gammon Construction Limited)
|
Site Agent
|
John Chan
|
3126 1202
|
2559 3410
|
|
Environmental Officer
|
Thomson Chang
|
9213
6569
|
2559 3410
|
|
Crispin Ao
|
9223
8773
|
2559 3410
|
|
Ao Ho Fo
|
9220
5848
|
2559 3410
|
|
ET of Stage 1
(AECOM Asia Company Limited)
|
ET Leader
|
Y T Tang
|
3922 9393
|
2371 7609
|
1.4.1 The construction phase of Stage 1 under the EP commenced on
23 November 2009.
1.4.2 Details of the construction works carried out by the
Contract 1 Contractor (China State Construction Engineering (Hong Kong) Ltd.)
in this reporting period are listed below:-
-
Temporary shoring, sheetpiling and excavation
-
Pile cap construction (Noise Barrier)
-
Installation of soil nails
-
At-grade road construction
-
Widening and demolition of central dividers
-
Retaining wall construction
-
Noise barrier footing construction
-
Noise barrier panels installation
-
Asphalt laying
-
Installation of Drainage Pipes
-
Modification of Edge coping
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
-
Initial and record survey
-
Survey Setting out works for slopes and structures
-
Setting up the temporary traffic arrangement
-
Excavation of trial trenches to locate existing utilities
-
Construction of haul road
-
Extension of box culvert and subway
-
Structural works of bridges
-
Construction of Pilecap / Spread footing of Noise Barrier / Semi
Noise Enclosure
-
Slope works, including installation of soil nails
-
NTHA mitigation works
-
Retaining wall construction
-
Noise barrier construction
-
Modification / Demolition of existing bridge structures
-
Entrusted watermains works
-
Sewer Installation
-
Road and drainage works
-
Landscaping works
1.4.4 The Construction Programmes are shown in Appendix B.
1.4.5 The general layout plan of the Project site showing the
contract areas is shown in Figure 1.1.
1.4.6 The environmental mitigation measures implementation
schedule are presented in Appendix C.
1.5.1 The EM&A programme required environmental monitoring
for air quality, noise and environmental site inspections for air quality,
water quality, noise, waste management, ecology, and landscape and visual
impact. The EM&A requirements for each parameter described in the following
sections include:-
- All monitoring
parameters;
- Monitoring
schedules for the reporting month and forthcoming months;
- Action and
Limit levels for all environmental parameters;
- Event / Action
Plan;
- Environmental
mitigation measures, as recommended in the Project EIA study final report; and
- Environmental
requirement in contract documents.
2.1.1
In accordance with the updated EM&A Manual,
baseline 1-hour and 24-hour TSP levels at 4 air quality monitoring stations
were established. Impact 1-hour TSP monitoring was conducted for at least three
times every 6 days, while impact 24-hour TSP monitoring was carried out for at
least once every 6 days. The Action and Limit level of the air quality
monitoring is provided in Appendix D.
2.2.1
24-hour TSP air quality monitoring was
performed using High Volume Sampler (HVS) located at each designated monitoring
station. The HVS meets all the requirements of the updated EM&A
Manual. Portable direct reading
dust meters were used to carry out the 1-hour TSP monitoring. Brand and model of the equipment is
given in Table 2.1.
Table 2.1 Air Quality Monitoring Equipment
|
Equipment
|
Brand
and Model
|
|
Portable direct reading dust meter
(1-hour TSP)
|
Sibata Digital Dust Monitor (Model
No. LD-3 and LD-3B)
|
|
High Volume Sampler
(24-hour TSP)
|
Tisch Total Suspended Particulate
Mass Flow Controlled High Volume Air Sampler (Model No. TE-5170
& GMW-2310)
|
2.3.1
Monitoring locations AM2 and AM3 were set up at
the proposed locations in accordance with updated EM&A Manual. However, for
monitoring locations: Dynasty View and Tai Po Garden, proposed in the updated
EM&A Manual, as approval could not be obtained from the owner¡¯s corporation
of the premises, baseline and impact air quality monitoring was conducted at 13
Ha Wun Yiu (AM1) and Tai Kwong Secondary School (AM4) respectively. The
monitoring station at 13 Ha Wun Yiu (AM1) was relocated to Fan Sin Temple, 3
Sheung Wun Yiu (AM1A) in February 2010. Also, the monitoring station at Tai
Kwong Secondary School (AM4) was relocated to 168 Shek Kwu Lung Village (AM4A)
in September 2011.
2.3.2 Figure
2.1 shows the locations of monitoring stations. Table 2.2 describes the details
of the monitoring stations.
Table 2.2 Locations
of Impact Air Quality Monitoring Stations
|
Monitoring Station
|
Location
|
Description
|
|
AM1A
|
3 Sheung
Wun Yiu
|
Ground
floor at the boundary outside Fan Sin Temple
|
|
AM2
|
12 Shan
Tong New Village
|
Ground
floor outside the premises
|
|
AM3
|
Riverain
Bayside
|
Roof of
the switch room
|
|
AM4A
|
168 Shek Kwu Lung Village
|
Roof of
the switch room
|
2.4.1
Table 2.3 summarizes the monitoring parameters,
frequency and duration of impact TSP monitoring.
Table 2.3 Air
Quality Monitoring Parameters, Frequency and Duration
|
Parameter
|
Frequency
and Duration
|
|
1-hour TSP
|
Three times every 6 days while the highest dust impact was
expected
|
|
24-hour TSP
|
Once every 6 days
|
2.5.1
24-hour TSP Monitoring
(a)
The HVS was installed in the vicinity
of the air sensitive receivers. The
following criteria were considered in the installation of the HVS.
(i)
A horizontal platform with appropriate
support to secure the sampler against gusty wind was provided.
(ii)
The distance between the HVS and any
obstacles, such as buildings, was at least twice the height that the obstacle
protrudes above the HVS.
(iii)
A minimum of 2 meters separation from walls,
parapets and penthouse for rooftop sampler.
(iv)
A minimum of 2 meters separation from any supporting
structure, measured horizontally.
(v)
No furnace or incinerator flues nearby.
(vi)
Airflow around the sampler was
unrestricted.
(vii)
Permission was obtained to set up the
samplers and access to the monitoring stations.
(viii)
A secured supply of electricity was
obtained to operate the samplers.
(ix)
The sampler was located more than 20
meters from any dripline.
(x)
Any wire fence and gate, required to
protect the sampler, did not obstruct the monitoring process.
(xi)
Flow control accuracy was kept within
¡À2.5% deviation over 24-hour sampling period.
(b)
Preparation of Filter Papers
(i)
Glass fibre filters, G810 were labelled
and sufficient filters that were clean and without pinholes were selected.
(ii)
All filters were equilibrated in the
conditioning environment for 24 hours before weighing. The conditioning
environment temperature was around 25 ¡ãC
and not variable by more than ¡À3 ¡ãC;
the relative humidity (RH) was < 50% and not variable by more than ¡À5%. A
convenient working RH was 40%.
(iii)
All filter papers were prepared and
analysed by ALS Technichem (HK) Pty Ltd., which is a HOKLAS accredited
laboratory and has comprehensive quality assurance and quality control
programmes.
(c)
Field Monitoring
(i)
The power supply was checked to ensure
the HVS works properly.
(ii)
The filter holder and the area
surrounding the filter were cleaned.
(iii)
The filter holder was removed by
loosening the four bolts and a new filter, with stamped number upward, on a
supporting screen was aligned carefully.
(iv)
The filter was properly aligned on the
screen so that the gasket formed an airtight seal on the outer edges of the
filter.
(v)
The swing bolts were fastened to hold
the filter holder down to the frame.
The pressure applied was sufficient to avoid air leakage at the edges.
(vi)
Then the shelter lid was closed and was
secured with the aluminum strip.
(vii)
The HVS was warmed-up for about 5
minutes to establish run-temperature conditions.
(viii)
A new flow rate record sheet was set
into the flow recorder.
(ix)
On site temperature and atmospheric
pressure readings were taken and the flow rate of the HVS was checked and
adjusted at around 1.1 m3/min, and complied with the range specified
in the updated EM&A Manual (i.e. 0.6-1.7 m3/min).
(x)
The programmable digital timer was set
for a sampling period of 24 hrs, and the starting time, weather condition and
the filter number were recorded.
(xi)
The initial elapsed time was recorded.
(xii)
At the end of sampling, on site
temperature and atmospheric pressure readings were taken and the final flow
rate of the HVS was checked and recorded.
(xiii)
The final elapsed time was recorded.
(xiv)
The sampled filter was removed
carefully and folded in half length so that only surfaces with collected
particulate matter were in contact.
(xv)
It was then placed in a clean plastic
envelope and sealed.
(xvi)
All monitoring information was recorded
on a standard data sheet.
(xvii)
Filters were then sent to ALS
Technichem (HK) Pty Ltd. for analysis.
(d)
Maintenance and Calibration
(i)
The HVS and its accessories were
maintained in good working condition, such as replacing motor brushes routinely
and checking electrical wiring to ensure a continuous power supply.
(ii)
5-point calibration of the HVS was
conducted using TE-5025A
Calibration Kit prior to the commencement of baseline monitoring. Bi-monthly
5-point calibration of the HVS will be carried out during impact monitoring.
(iii)
Calibration certificate of the HVSs are
provided in Appendix E.
2.5.2
1-hour TSP Monitoring
(a)
Measuring Procedures
The measuring procedures of the
1-hour dust meter were in accordance with the Manufacturer¡¯s Instruction Manual
as follows:-
(i)
Turn the power on.
(ii)
Close the air collecting opening cover.
(iii)
Push the ¡°TIME SETTING¡± switch to [BG].
(iv)
Push ¡°START/STOP¡± switch to perform
background measurement for 6 seconds.
(v)
Turn the knob at SENSI ADJ position to
insert the light scattering plate.
(vi)
Leave the equipment for 1 minute upon
¡°SPAN CHECK¡± is indicated in the display.
(vii)
Push ¡°START/STOP¡± switch to perform
automatic sensitivity adjustment. This measurement takes 1 minute.
(viii)
Pull out the knob and return it to
MEASURE position.
(ix)
Push the ¡°TIME SETTING¡± switch the time
set in the display to 3 hours.
(x)
Lower down the air collection opening
cover.
(xi)
Push ¡°START/STOP¡± switch to start
measurement.
(b)
Maintenance and Calibration
(i)
The 1-hour TSP meter was calibrated at
1-year intervals against a continuous particulate TEOM Monitor, Series 1400ab.
Calibration certificates of the Laser Dust Monitors are provided in Appendix E.
(ii)
1-hour validation checking of the TSP
meter against HVS is carried out yearly at the air quality monitoring
locations.
2.6
Monitoring Schedule for the Reporting Month
2.6.1
The schedule for environmental monitoring in
May 2013 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
|
80.2
|
76.7 ¨C 82.8
|
302.1
|
500
|
|
AM2
|
80.1
|
73.6 ¨C 83.3
|
301.9
|
500
|
|
AM3
|
80.2
|
74.9 ¨C 82.9
|
301.9
|
500
|
|
AM4A
|
80.8
|
75.3 ¨C 83.5
|
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
|
21.8
|
4.5 ¨C 36.4
|
176.6
|
260
|
|
AM2
|
16.4
|
5.9 ¨C 29.8
|
178.6
|
260
|
|
AM3
|
16.9
|
6.3 ¨C 23.7
|
193.1
|
260
|
|
AM4A
|
27.5
|
9.6 ¨C 43.6
|
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 May 2013 from the Tai Mei Tuk Automatic Weather Station
were missing, the weather data from Tai Po Automatic Weather Station in May 2013 are
included in Appendix H for supplementary purpose.
3.1.1
In accordance with the EM&A Manual, impact
noise monitoring was conducted for at least once per week during the
construction phase of Stage 1 of the Project. The Action and Limit level of the noise monitoring
is provided in Appendix D.
3.2
Monitoring Equipment
3.2.1
Noise monitoring was performed using sound
level meter at each designated monitoring station. The sound level meters deployed comply
with the International Electrotechnical Commission Publications (IEC) 651:1979
(Type 1) and 804:1985 (Type 1) specifications. Acoustic calibrator was deployed to
check the sound level meters at a known sound pressure level. Brand and model of the equipment is
given in Table 3.1.
Table 3.1 Noise
Monitoring Equipment
|
Equipment
|
Brand and Model
|
|
Integrated
Sound Level Meter
|
Rion NL-31
/ B&K 2238
|
|
Acoustic
Calibrator
|
Rion NC-73
|
3.3.1
Monitoring stations NM3, NM6 and NM7 were set up
at the proposed locations in accordance with updated EM&A Manual. However,
for monitoring locations: Tai Po Garden (NM1), Dynasty View (NM2), Hong Kong
Teachers¡¯ Association Lee Heng Kwei Secondary School (NM4) and Grand Palisades
(NM5), proposed in the updated EM&A Manual, impact noise monitoring was
conducted at alternative monitoring locations, as approval of access could not
be obtained from the owner¡¯s corporation of the premises or the principal of
the education institutes. The monitoring station at Tai Kwong Secondary School
(NM1) was relocated to 168 Shek Kwu Lung Village (NM1A) in September 2011.
3.3.2
Figure 2.1 shows the locations of the
monitoring stations. Table 3.2 describes the details of the monitoring
stations.
Table 3.2 Locations
of Impact Noise Monitoring Stations
|
Monitoring Station
|
Location
|
Description
|
|
NM1A
|
168 Shek Kwu Lung Village
|
1m from the exterior wall of the
village house
|
|
NM2
|
38 Ha Wun Yiu
|
1.2m from the ground floor free-field
of the village house
|
|
NM3
|
Wong Shiu Chi Middle School
|
1m from the exterior of the roof top
façade of the New Wing
|
|
NM4
|
Uptown Plaza
|
1m from the exterior of the roof top
façade of Block 4
|
|
NM5
|
The Paragon
|
1m from the exterior of the roof top
façade of the club house
|
|
NM6
|
PLK Tin Ka Ping Primary School
|
1.2m ground floor free-field near the
entrance
|
|
NM7
|
Riverain Bayside
|
1m from the exterior of the roof
façade of the switch room
|
3.4.1
Table 3.3 summarizes the monitoring parameters,
frequency and duration of impact noise monitoring.
Table
3.3 Noise
Monitoring Parameters, Frequency and Duration
|
Parameter
|
Frequency
and Duration
|
|
30-mins measurement at each monitoring station between 0700 and
1900 on normal weekdays. Leq, L10 and L90
would be recorded.
|
At least once per week
|
3.5.1
Monitoring Procedure
(a)
Façade measurements were made at all monitoring
locations, except monitoring stations NM2 and NM6.
(b)
The sound level meter was set on a
tripod at a height of 1.2 m
above the ground for free-field measurements at NM2 and NM6.
(c)
The battery condition was checked to
ensure the correct functioning of the meter.
(d)
Parameters such as frequency weighting,
the time weighting and the measurement time were set as follows:-
(i)
frequency weighting: A
(ii)
time weighting: Fast
(iii)
time measurement: Leq(30-minutes)
during non-restricted hours i.e. 07:00 ¨C 1900 on normal weekdays; Leq(5-minutes)
during restricted hours i.e. 19:00 ¨C 23:00 and 23:00 ¨C 07:00 of normal weekdays, whole day of
Sundays and Public Holidays
(e)
Prior to and after each noise
measurement, the meter was calibrated using the acoustic calibrator for 94dB(A)
at 1000 Hz. If the difference in
the calibration level before and after measurement was more than 1 dB(A), the
measurement would be considered invalid and repeat of noise measurement would
be required after re-calibration or repair of the equipment.
(f)
During the monitoring period, the Leq,
L10 and L90 were recorded. In addition, site conditions and noise
sources were recorded on a standard record sheet.
(g)
Noise measurement was paused during
periods of high intrusive noise (e.g. dog barking, helicopter noise) if possible.
Observations were recorded when intrusive noise was unavoidable.
(h)
Noise monitoring was cancelled in the
presence of fog, rain, wind with a steady speed exceeding 5m/s, or wind with gusts exceeding 10m/s.
3.5.2
Maintenance and Calibration
(a)
The microphone head of the sound level
meter was cleaned with soft cloth at regular intervals.
(b)
The meter and calibrator were sent to
the supplier or HOKLAS laboratory to check and calibrate at yearly intervals.
(c)
Calibration certificates of the sound level
meters and acoustic calibrators are provided in Appendix E.
3.6.1
The schedule for environmental monitoring in
May 2013 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
|
61.8
|
59.7 ¨C 63.7
|
75
|
|
NM2
|
68.8*
|
66.2 ¨C 72.3*
|
75
|
|
NM3
|
61.2
|
51.5 ¨C 63.8
|
70#
|
|
NM4
|
65.0
|
63.3 ¨C 65.8
|
75
|
|
NM5
|
61.8
|
48.9 ¨C 64.8
|
75
|
|
NM6
|
61.9*
|
60.9 ¨C 63.9*
|
70#
|
|
NM7
|
59.0
|
45.2 ¨C 64.4
|
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
There was no noise complaint related to 0700 ¨C
1900 hours on normal weekdays was received and
followed up by Environmental Team in the reporting period. Hence, no
Action Level exceedance was recorded.
3.7.3
No noise monitoring result exceeding the Limit
Level was recorded at all monitoring stations in the reporting month.
3.7.4
Major noise sources during the noise monitoring
included construction activities of Stage 1 of the Project and nearby traffic
noise and general school activities.
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, 5 site
inspections were carried out on 3, 8, 15, 23 and 29 May 2013 for Contract 1 of
the Project, and 5 site inspections for Contract 2 of the Project were carried
out on 2, 9, 16, 23 and 30 May 2013.
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
The Contractor was reminded to
cover the exposed stockpiles of sands and stones with tarpaulin.
Noise
4.1.5
No adverse observation was identified in the
reporting month.
Water Quality
4.1.6
Stagnant water was observed
within the construction area at NB10. The Contractor was reminded to remove the
stagnant waster regularly.
4.1.7
Stagnant water was observed within the construction area at
Gate 26. The Contractor was reminded to remove the stagnant water so as to
prevent mosquito breeding.
Chemical and Waste Management
4.1.8
The Contractor was reminded to
clear the refuse or cover the refuse before removal at Gate 28.
4.1.9
The Contractor was reminded to
clear the construction waste accumulated at Gate 26 regularly.
Landscape and Visual Impact
4.1.10
No adverse observation was identified in the
reporting month.
Miscellaneous
4.1.11
No adverse observation was identified in the
reporting month.
4.1.12 Particular
observations and reminder during the site inspections for Contract 2 are described
below:
Air Quality
4.1.13
Dusty constrcution materials were exposed at
Area A. The Contractor was reminded to cover the construction materials to
avoid emission of fugitive dust.
4.1.14
The Contractor was reminded to cover the open
stockpiles of construction materials with tarpaulin.
4.1.15
Opened cement bag was placed on bare ground
without being covered at Area NLK P4. The Contractor was reminded to cover the
bag or remove it if applicable.
4.1.16
The Contractor was reminded to cover the soil
stockpiles with tarpaulin at Truck Sewer.
Noise
4.1.17
No adverse observation was identified in the
reporting month.
Water Quality
4.1.18
Stagnant water was observed within the car
wheels at Bridge 15A. The Contractor was reminded to remove the stagnant water
to prevent mosquiro breeding.
Chemical and Waste Management
4.1.19
The Contractor was reminded to sort and segregate the
construction waste before removal at Area A.
4.1.20
Several cans of oil were placed on bare ground at Bridge 13A.
The Contractor was reminded to provide a drip tray to prevent oil leakage or
remove the oil cans if applicable.
4.1.21
The Contractor was reminded to remove the oil stains on the
ground at NB 42.
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),
59m3 of inert
C&D material was disposed as public fill to Tuen Mun 38 (of which 0m3 was broken concrete), while
117m3
of general refuse was disposed at NENT landfill. 134kg of
paper/cardboard packaging, 2,637kg of plastics and 0kg of metals were collected by recycling contractor in the reporting
month. 1,965m3
and 388m3 of inert C&D materials were reused on site and reused
in NENT for backfilling purpose respectively. 800kg of chemical waste was collected by licensed
contractor in the reporting period.
4.2.3
As advised by the Contract 2 Contractor (GCL), 440m3
of inert C&D material were disposed to Tuen Mun 38 and 395m3
general refuse was disposed to NENT landfill in the reporting period. No
paper/cardboard packaging was collected by recycling contractor in the
reporting month. Besides, no chemical waste was collected by licensed
contractor 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/A
|
31/01/2012
|
N/A
|
HyD
|
Tolo
Highway/Fanling Highway between Island House
Interchange and Ma Wo
|
|
WPCO
|
Discharge License
(Office)
|
WT00005096-2009
|
03/12/2009
|
31/12/2014
|
CSHK
|
Discharge at Site
Office
|
|
Discharge License
(Site)
|
WT00005445-2009
|
15/12/2009
|
31/12/2014
|
CSHK
|
Discharge of
Construction Runoff
|
|
Discharge License
(Office)
|
WT00006782-2010
|
25/06/2010
|
30/06/2015
|
GCL
|
Discharge at Site
Office
|
|
Discharge License
(Site)
|
WT00007162-2010
|
09/08/2010
|
31/07/2015
|
GCL
|
Discharge of
Construction Runoff
|
|
WDO
|
Chemical Waste
Producer Registration
|
5213-727-C3249-46
|
25/09/2009
|
N/A
|
CSHK
|
Chemical waste
produced in Contract HY/2008/09
|
|
5213-722-G2347-18
|
18/05/2010
|
N/A
|
GCL
|
Chemical waste
produced in Contract HY/2009/08
|
|
WDO
|
Billing
Account for Disposal of
Construction Waste
|
7009328
|
08/09/2009
|
N/A
|
CSHK
|
Waste disposal in
Contract HY/2008/09
|
|
7010320
|
02/03/2010
|
N/A
|
GCL
|
Waste disposal in
Contract HY/2009/08
|
|
NCO
|
Construction Noise
Permit
|
GW-RN0034-13
|
29/01/2013
|
30/06/2013
|
CSHK
|
Modification of Sign
Gantries (G75)
|
|
GW-RN0029-13
|
21/01/2013
|
20/07/2013
|
CSHK
|
TB1&2 Construction
|
|
GW-RN0096-13
|
19/02/2013
|
04/06/2013
|
CSHK
|
Modification of Sign Gantry near Shatin Section (G12 & G74)
|
|
GW-RN0122-13
|
04/03/2013
|
17/08/2013
|
CSHK
|
Routine Road Maintenance
|
|
GW-RN0125-13
|
01/03/2013
|
01/06/2013
|
CSHK
|
Modification of Sign Gantry near Tai Po Section (G13, G65 & G70)
|
|
GW-RN0161-13
|
24/03/2013
|
09/06/2013
|
CSHK
|
Noise Barrier Installation at Tolo Highway near Classical Garden
|
|
GW-RN0176-13
|
26/03/2013
|
31/05/2013
|
CSHK
|
Laying of Cross Road Duct at Tolo Highway near Island House
Interchange
|
|
GW-RN0177-13
|
24/03/2013
|
02/06/2013
|
CSHK
|
Installation of Permanent Lighting at Tolo Highway from Shan Tong Road
to Ma Wo
|
|
GW-RN0223-13
|
20/04/2013
|
26/05/2013
|
CSHK
|
Road Marking Alternation at Tolo Highway near Shan Tong Road
|
|
GW-RN0224-13
|
16/04/2013
|
29/06/2013
|
CSHK
|
Modification Works for Sign Gantry 16 & 17
|
|
GW-RN0226-13
|
24/04/2013
|
23/10/2013
|
CSHK
|
Construction of W4 - NLKRB South Abutment
|
|
GW-RN0230-13
|
21/04/2013
|
26/05/2013
|
CSHK
|
Road Marking Alternation at Tolo
Highway near Lam Kam Railway Bridge
|
|
GW-RN0221-13
|
21/04/2013
|
23/06/2013
|
CSHK
|
Installation of Concrete Profile
Barriers at Tolo Highway near Tat
Wan Road
|
|
GW-RN0516-12
|
24/04/2013
|
23/10/2013
|
CSHK
|
Construction of W4 - NLKRB South Abutment
|
|
GW-RN0246-13
|
03/05/2013
|
28/09/2013
|
CSHK
|
Road Pavement at Slip Road from Tolo Highway to Tai Po Road-Yuen Chau
Tsai
|
|
GW-RN0247-13
|
03/05/2013
|
30/06/2013
|
CSHK
|
NLKRB Construction during I&P of MTR's Tracks
|
|
GW-RN0257-13
|
12/05/2013
|
23/06/2013
|
CSHK
|
Road Marking Alternation at Tolo Highway near Ma Wo - Stage 6B (Joint
Operation with Contract: HY/2009/08)
|
|
GW-RN0270-13
|
19/05/2013
|
01/07/2013
|
CSHK
|
Road Marking Alternation at Tolo Highway near Ma Wo - Stage 5A (Joint
Operation with Contract: HY/2009/08)
|
|
GW-RN0271-13
|
13/05/2013
|
15/06/2013
|
CSHK
|
Road Marking Alternation near G14
|
|
GW-RN0261-13
|
11/05/2013
|
03/06/2013
|
CSHK
|
Road Marking Alternation at Tolo
Highway near Tat Wan Road
|
|
GW-RN0602-12
|
28/12/2012
|
28/05/2013
|
GCL
|
Erection of Overhead Falsework Between NLKP9 and NLKP10
|
|
GW-RN0056-13
|
29/01/2013
|
24/07/2013
|
GCL
|
Tolo Highway Northbound (CH 18.39 - 19.1)
|
|
GW-RN0091-13
|
27/02/2013
|
27/08/2013
|
GCL
|
Tolo Highway and Fanling Highway near Tai Po Tai Wo Road, Lam Kam
Interchange & Tai Wo Service Road West
|
|
|
|
GW-RN0132-13
|
01/03/2013
|
31/08/2013
|
GCL
|
Dismantle of B18A, erection and removal of sign gantry at Tolo
Northbound
|
|
GW-RN0113-13
|
01/03/2013
|
31/08/2013
|
GCL
|
Dismantle of B18A, erection of sign gantry at Tolo Southbound
|
|
GW-RN0139-13
|
19/03/2013
|
24/08/2013
|
GCL
|
Dismantling of Overhead Falsework at NLKP6 and NLKP7
|
|
GW-RN0146-13
|
13/03/2013
|
10/08/2013
|
GCL
|
Tai Po Tai Wo Road North Bound
|
|
GW-RN0153-13
|
24/03/2013
|
08/09/2013
|
GCL
|
Tolo highway near Dynasty View
|
|
GW-RN0192-13
|
02/04/2013
|
20/08/2013
|
GCL
|
Tolo Highway Northbound near Lam Kam Interchange
|
|
GW-RN0194-13
|
03/04/2013
|
02/10/2013
|
GCL
|
Near Lam Kam Interchange
Supersede CNP GW-RN0064-13
|
|
GW-RN0240-13
|
28/04/2013
|
08/07/2013
|
GCL
|
Road Pavement Works at Tolo Highway Northbound CH18 to 18.7B near
Dynasty View
|
|
GW-RN0235-13
|
19/04/2013
|
16/10/2013
|
GCL
|
Tolo Highway Northbound near Buddist Tai Kwong Middle School and Shek
Lin Road
|
|
GW-RN0237-13
|
25/04/2013
|
27/09/2013
|
GCL
|
Tai Po Tai Wo Road Uphill to Tolo Highway Northbound
|
|
GW-RN0250-13
|
30/04/2013
|
26/10/2013
|
GCL
|
Tolo Highway Southbound near Parc Versailles
|
|
GW-RN0284-13
|
15/05/2013
|
02/11/2013
|
GCL
|
Construction of B15A
|
|
GW-RN0268-13
|
12/05/2013
|
09/07/2013
|
GCL
|
Tolo Highway South Bound CH19.8 to CH 18.7
|
|
GW-RN0260-13
|
08/05/2013
|
25/10/2013
|
GCL
|
Slip Road from Tolo Highway North Bound to Tai Po Tai Wo Road
|
|
GW-RN0255-13
|
12/05/2013
|
23/06/2013
|
GCL
|
Tolo Highway North Bound from CH17.96B to 18.70B near Dynasty View
|
|
GW-RN0265-13
|
19/05/2013
|
01/07/2013
|
GCL
|
Temporary Road Diversion at Tolo Highway South Bound from CH 18.30 to
17.96A near Dynasty View
|
|
GW-RN0259-13
|
14/05/2013
|
13/07/2013
|
GCL
|
Dismantling of Overhead Falsework from NLKP8 NLKP10
|
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
was one (1) complaint (included one (1) air related complaint) received on 25
April 2013 and followed up by Environmental Team in May 2013.
4.6.3 The air
complaint was received by EPD on 25 April 2013 and referred from EPD on the
same day. The complainant expressed that there were about seven to eight trucks
unloading the rock at Shek Kwu Lung on 25 April 2013. Generation of fugitive
dust would be his concern if the mentioned activities were carried out without
the use of hoarding and spraying with water.
As informed by the
Contractor (Gammon Construction Ltd) and confirmed by the Engineer of the
Project, rock filling at RWTW3 and formwork erection at RWTW3A on 25 April 2013
were being carried out at Shek Kwu Lung as shown in the layout plan below.
Mitigation measures, including water spraying at the concrete pavement near
site access, wetting the fill material surface during unloading works, cleaning
the wheels of vehicles before leaving the site area as well as maintaining
proper traffic order in public area near site access were taken by the
Contractor.
With reference to the monitoring
results recorded on days near to the day of complaint at the nearest EM&A
monitoring station (AM4A- 168 Shek Kwu Lung Village), the 24-hour TSP level on
19 April 2013 and 25 April 2013 were found to be 20.6ug/m3 and
23.8ug/m3 respectively, which were below the action level of 198.5
ug/m3. Besides, the average 1-hour TSP level on 26 April 2013 at the
nearest EM&A monitoring station (AM4A- 168 Shek Kwu Lung Village) was found
to be 79.7ug/m3, which was also below the action level of 302.3ug/m3.
Nevertheless, the complaint was considered
as project-related. Therefore, the Contractor is reminded to enhance the dust
mitigation as below:
-
Confirm the implementation of dust
mitigation measures (watering for the haul roads and at work areas RWTW3 and
RWTW3A, covering of dusty materials carrying in dump trucks within the
construction area, screening the rock filling area from the public access road
and nearby residences by hoarding, tarpaulin sheets or netting) during all
construction / dusty activities to prevent any fugitive dust generation;
-
Increase the frequency of watering
in the work areas (specially near site access and work areas RWTW3) to maintain
the surface of site haul roads and exposed surfaces in wet condition;
-
Cover the backfilling surface after
work;
-
Maintain soil surface wet before
loading and unloading activities;
-
Maintain the frequency of the
environmental supervision (by the Contractor) to regular review the adequacy
and effectiveness of dust suppression measures to suit the construction
progress; and
- Foster better public relations with the sensitive
receivers / the complainant nearby.
4.6.4
No new complaint, notification
of summons and prosecution was received in the reporting period.
4.6.5
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 June 2013 will
be:-
-
Temporary shoring, sheetpiling and excavation
-
Pile cap construction (Noise Barrier)
-
Installation of soil nails
-
At-grade road construction
-
Widening and demolition of central dividers
-
Retaining wall construction
-
Noise barrier footing construction
-
Noise barrier panels installation
-
Asphalt laying
-
Installation of drainage pipes
-
Modification of edge coping
5.1.2
The major construction works for Contract 2 in June 2013 will
be:-
-
Condition survey of existing structures
-
Initial and record survey
-
Survey Setting out works for slopes and structures
-
Setting up the temporary traffic arrangement
-
Excavation of trial trenches to locate existing utilities
-
Construction of haul road
-
Extension of box culvert and subway
-
Structural works of bridges
-
Construction of Pilecap / Spread footing of Noise Barrier / Semi
Noise Enclosure
-
Slope works, including installation of soil nails
-
NTHA mitigation works
-
Retaining wall construction
-
Noise barrier construction
-
Modification / Demolition of existing bridge structures
-
Entrusted watermains works
-
Sewer Installation
-
Road and drainage works
-
Landscaping works
5.2
Key Issues for the Coming Month
5.2.1
Key issues to be considered in June 2013:-
-
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 June 2013 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 and 24-hour TSP monitoring results
complied with the Action / Limit Levels in the reporting period.
6.1.4
No Action and Limit Level exceedance for
construction noise was recorded at all monitoring stations in the reporting
month.
6.1.5
Environmental site inspection was carried out 10 times
in May 2013.
Recommendations on remedial actions were given to the Contractors for the
deficiencies identified during the site audits.
6.1.6
There was one (1) complaint (included one (1)
air related complaint) received on 25 April 2013 and followed up by
Environmental Team in May 2013. Investigation of the air related complaint was
carried out and the findings and proposed mitigation measures were submitted to
all relevant parties.
6.1.7
No new complaint, 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 The soil stockpiles should be
properly covered.
l Exposed cement bags should be
covered.
Construction
Noise Impact
l Properly erect the temporary
noise barriers in accordance with the Environmental Permit requirement.
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.
Water Quality
Impact
l Preventive measures should be
implemented to avoid the spread of mud trails on the public road.
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 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.
l Drip tray should be provided to prevent oil
leakage.
Landscape and
Visual Impact
l All retained trees should be
properly fenced off at the works area.
