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Contents
1.1 Project Scope
1.2 Scope of the Enhanced TSP Monitoring Plan
1.3 Works Programme
2.1 Introduction
2.2 Monitoring Stations
2.3 Monitoring Parameter
2.4 Monitoring Equipment &
Methodology
2.5 Laboratory Measurement and
Analysis
2.6 Monitoring Period and
Frequency
2.7 Air Quality Compliance
3.1 Baseline Monitoring
3.2 Impact Monitoring
1
Introduction
According to
the findings of the Northwest New Territories (NWNT) Traffic and Infrastructure
Review conducted by the Transport Department, Tuen Mun Road, Ting Kau Bridge,
Lantau Link and North Lantau Highway (NLH) will be operating beyond capacity
after 2016 due to the increase in cross boundary traffic, developments in the
NWNT, and possible developments in North Lantau, including the Airport
developments, the Lantau Logistics Park (LLP) and the Hong Kong – Zhuhai –
Macao Bridge (HZMB). In order to
cope with the anticipated traffic demand, two new road sections between NWNT
and North Lantau – Tuen Mun – Chek Lap Kok Link (TM-CLKL) and Tuen Mun Western
Bypass (TMWB) are proposed.
An
Environmental Impact Assessment (EIA) of TM-CLKL (“the Project”) was prepared
in accordance with the EIA Study Brief (No. ESB-175/2007) and the Technical Memorandum of the Environmental
Impact Assessment Process (EIAO-TM),
which was submitted under the Environmental Impact Assessment Ordinance (EIAO)
in August 2009. Subsequent to the
approval of the EIA (EIAO Register Number AEIAR-145/2009), an Environmental
Permit (EP-354/2009) for TM-CLKL was granted by the Director of Environmental
Protection (DEP) on 4 November 2009, and a variation to the EP (EP-354/2009A)
was issued on 8 December 2010.
The
Supplementary Information on Construction
Air Quality in Tuen Mun ([1]) (the
Supplementary Information) submitted
under Section 8.(1) of the EIAO for
the Project stated that exceedances of the annual Total Suspended Particulates
(TSP) criteria of 80µg/m3 were anticipated at seven existing Air
Sensitive Receivers (ASRs) in the Pillar Point area during the construction
stage of the Project. As per Condition 2.4 of the EP of TM-CLKL, an enhanced monitoring plan on TSP level at Tuen Mun
(“the Enhanced TSP Monitoring Plan”)
is required to be submitted to the DEP for approval at least 1 month before the commencement of construction of the
Project. The Enhanced TSP
Monitoring Plan shall include the locations
and frequency of monitoring and details of the measures to mitigate any upsurge
of TSP level including increase the frequency of monitoring of TSP and stoppage
of works.
This Enhanced TSP Monitoring Plan has been prepared by
ERM-Hong Kong, Limited (ERM) on behalf of Dragages-Bouygues Joint Venture
(DBJV), the Contractor for Contract
No. HY/2012/08, and presents the methodology for enhanced monitoring of TSP level at
Tuen Mun to be undertaken in accordance with Condition 2.4 of the EP.
1.1
Project Scope
The TM-CLKL comprises
a dual 2-lane highway connecting the proposed Tuen Mun Western Bypass at the
southern coast of
·
Contract
I (appointed under Contract No.
HY/2012/07) – Southern Connection Viaduct Section;
·
Contract
II (appointed under Contract No.
HY/2012/08) – Northern Connection Sub-sea Tunnel Section (“Northern
Connection”);
·
Contract
III – Northern Connection Toll Plaza and Associated Works (the “toll plaza”);
·
Contract
IV – Northern Connection Tunnel Buildings, Electrical and Mechanical Works
(“tunnel buildings”); and
·
Contract
V – Northern Connection Traffic Control and Surveillance System (“TCSS”).
The scope of
the above Contracts is indicated in Figures 1.2-6,
respectively.
Under Contract No. HY/2012/08, DBJV is
commissioned by the Highways Department (HyD) to undertake the design and
construction of the Northern Connection Sub-sea Tunnel Section of TM-CLKL,
including the northern landfall at Tuen Mun.
Specifically,
the scope of Contract No. HY/2012/08
includes:
·
design and construction of sub-sea TBM tunnels (two
tubes with cross passages) across the Urmston Road, connecting Tuen Mun Area 40
and HKBCF, of approximately 4 km in length with dual 2-lane carriageway;
·
design and construction of cut-and-cover tunnels (two
boxes with cross passages) at both the southern landfall and the northern
landfall for construction of approach roads to the sub-sea TBM tunnels, of
approximately 1.5 km in length;
·
construction of northern landfall reclamation of
approximately 16.5 hectares and about 2.0 km long seawalls;
·
design and construction of ventilation buildings at
the southern and northern landfalls;
·
design and construction of at-grade roads at the
southern and northern landfalls;
·
construction of extension of the existing 4-cell box
culvert adjacent to the River Trade Terminal (RTT);
·
provision of a temporary pontoon for the affected
existing Government berths;
·
design and construction for modification of a section
of vertical seawall of approximately 220m in length at the southern landfall to
sloping seawall;
·
design and construction of associated civil,
structural, building, geotechnical, marine, environmental protection, drainage
and sewerage, waterworks and utility works; and
·
design and construction of advance SEM provision to
facilitate installation of tunnel and route-wide E&M, TCSS and other
utilities.
1.2
Scope of the Enhanced TSP Monitoring Plan
This Enhanced
TSP Monitoring Plan is prepared under Contract
No HY/2012/08 which involves the construction of the Northern Connection in
the Tuen Mun area. While other construction works in
the Tuen Mun area will
be undertaken by Contracts III (ie construction of toll plaza), IV
(construction of tunnel buildings) and V (installation of TCSS), respectively,
and are thus outside the scope of the current Contract, this Enhanced TSP Monitoring Plan is applicable to the
construction works of all contracts within the Tuen Mun area (ie Contracts
II-V) under Condition 2.4 of EP-354/2009/A.
1.3
Works Programme
The
construction works of the Northern Connection under Contract No. HY/2012/08 are anticipated to commence in November
2013. The preliminary construction
programme and the corresponding Contract components are provided in Figures 1.7 and 1.8, respectively.
Given that
other construction works within the Tuen Mun area (eg construction of the toll
plaza, tunnel buildings and TCSS etc) will be undertaken under Contracts III,
IV and V which have not been awarded yet (ie Contracts III, IV and V), the
construction programmes are yet to be available.
2
Enhanced
TSP Monitoring
2.1
Introduction
The following section
provides the details of the Enhanced TSP Monitoring Plan to be undertaken by the
Environmental Team (ET) under Condition
2.4 of EP-354/2009/A. The objective of the enhanced monitoring
of TSP is to provide an increased monitoring frequency of TSP to allow any
deteriorating air quality to be readily detected and timely action taken to
rectify the situation. The enhanced
monitoring also covers additional TSP monitoring station with a view to
confirming that no unacceptable construction dust impact is detected at nearby
sensitive receiver. It should be noted that all relevant air quality
mitigation measures recommended or specified in the EP, EIA, EM&A Manual,
Environmental Management Plan, Method Statements, and General and Particular
Specifications of this Project will be strictly followed to reduce potential
construction dust impacts
Based on the
findings presented in TM-CLKL EIA study, major construction dust nuisance is
associated with exposed land-based site areas and the reclamation areas when
the following construction activities are undertaken:
·
Excavation;
·
Road works;
·
Slope works;
·
Foundation works;
·
Construction of road and superstructures;
·
Wind erosion from reclaimed areas, open sites and
stockpiling areas; and
·
Demolition of existing structure.
Amongst the
above construction activities, excavation, slope works, foundation works,
construction of road and superstructures, wind erosion from reclaimed areas,
open sites and stockpiling areas are the major sources of dust nuisance
relevant to construction activities for the Northern Connection under Contract No. HY/2012/08 and other
construction works within the Tuen Mun area under Contracts III, IV and V. As such this Enhanced TSP Monitoring
Plan is proposed to be implemented for these main types of construction
activities.
2.2
Monitoring Stations
The proposed
monitoring stations for the enhanced TSP monitoring are shown in Figure 2.1 and detailed in Table 2.1.
It is proposed
that the monitoring locations will be designed to cover the dust-generating
land-based construction works from the Northern Connection, toll plaza, tunnel
buildings and TCSS to identify the direct impacts to air quality sensitive
receivers (ASRs).
As determined
by the TM-CLKL EIA study, ASR1 and ASR5 are proposed in the approved EM&A
Manual as the dust monitoring location for air quality monitoring during the construction
phase. Based on the requirements
stated in the EM&A Manual, 1 set of 24-hour TSP and 3 sets of 1-hour TSP
monitoring will be conducted at ASR1 and ASR5 at least once in every six days
during the construction phase. For
the purpose of this Enhanced TSP Monitoring Plan, ASR1 and ASR5 will also be
included as near-field monitoring stations for the construction activities of
Northern Connection.
Three
additional monitoring stations, AQMS1, AQMS2 and ASR 10, are proposed in the
Enhanced TSP Monitoring Plan. AQMS1
is the abandoned Rive Trade Golf where the site office under Contract No. HY/2012/08 is located. AQMS1 is at approximately 60 m to the
west of the toll plaza works site and 270 m to the north of Northern Connection
works boundary. AQMS2 ([2]) is
located at the bare ground in the proximity of the toll plaza works site and
approximately 300 m to the northeast of Northern Connection works
boundary. These two stations are
added to capture the dust impacts from the construction of the toll plaza. They are also serving as mid-field
monitoring stations for the construction of the Northern Connection. The third additional station, ASR10, is
located at the Butterfly Beach Park at 170 m to the east of the land-based
works site boundary. This is a
far-field monitoring station which serves as a check-point to provide TSP
measurements to indicate the background TSP levels of the Tuen Mun area.
No far-field
air quality monitoring station is proposed to the west of the works site
boundary for the Enhanced TSP monitoring Plan since the area is industrial in
nature and air quality is mainly affected by nearby activities such as
operations of the Fill Bank at Tuen Mun Area 38 (TMFB). It would thus be difficult to use data
collected in this far field area to show any additional dust impacts from the
TMCLKL works. As such, additional
TSP monitoring station is not considered necessary at this area.
Given that no
ASR is identified within the northern part of the works site boundary, and the
construction works are marine-based in nature in the southern part of the works
site boundary, no far-field air quality monitoring station is proposed for the
Enhanced TSP Monitoring Plan in both the northern and southern parts of the
works site.
Table 2.1 Enhanced
TSP Monitoring Plan – Monitoring Stations
|
Air quality
monitoring station |
Location |
Landuse |
No.
of Storey |
Horizontal
Distance to the Major Construction Area (m) |
|
|
|
|
|
|
Northern
Landfall |
Toll
Plaza |
|
ASR1 |
Tuen
Mun Fireboat Station |
Office |
1 |
< 50 |
< 50 |
|
ASR5 |
Pillar
Point Fire Station |
Office |
5 |
< 50 |
> 500 |
|
|
|
|
|
|
|
|
AQMS1 |
Previous
River Trade Golf |
Bare
ground |
0 |
270 |
60 |
|
AQMS2 |
Bare
ground at Ho Suen Street |
Bare
ground |
0 |
350 |
< 50 |
|
ASR10 |
Butterfly
Beach Park |
Recreational
uses |
0 |
> 1000 |
170 |
The status and
locations of dust sensitive receivers may change after issue of this Enhanced
TSP Monitoring Plan. If this happens,
the ET shall agree with the SOR, in consultation with the IEC, to propose the
alternative/updated air quality monitoring station(s).
2.3
Monitoring Parameter
TSP levels
have been proposed for measurement based on Supplementary
Information that exceedances of the annual TSP criterion are predicted in
the Pillar Point area during the construction phase of the Northern Connection
and toll plaza. 1-hour and 24-hour
TSP levels shall be measured to indicate the impacts of construction dust on
air quality.
In addition to
the TSP measurements, all relevant data including weather conditions,
elapsed-time meter reading for the start and stop of the sampler,
identification and weight of the filter paper, any other special phenomena and
work progress of the concerned site shall be recorded in detail by the ET.
2.4
Monitoring Equipment &
Methodology
The 1-hour and
24-hour TSP levels shall be measured by following the standard high volume
sampling method as set out in the Title 40
of the Code of Federal Regulations, Chapter 1 (Part 50), Appendix B.
The high
volume samplers (HVS) shall be equipped with an electronic mass flow controller
and be calibrated against a traceable standard at regular intervals. All the equipment, calibration kit,
filter papers, etc. shall be clearly labelled.
HVS in
compliance with the following specifications shall be used for carrying out the
1-hour and 24-hour TSP monitoring:
·
0.6-1.7 m3/min (20-60 SCFM) adjustable flow
range;
·
equipped with a timing/control device with +/- 5
minutes accuracy for 24 hours operation;
·
installed with elapsed-time meter with +/- 2 minutes
accuracy for 24 hours operation;
·
capable of providing a minimum exposed area of 406 cm2 (63 in2);
·
flow control accuracy: +/- 2.5% deviation over 24-hr
sampling period;
·
equipped with a shelter to protect the filter and
sampler;
·
incorporated with an electronic mass flow rate
controller or other equivalent devices;
·
equipped with a flow recorder for continuous
monitoring;
·
provided with a peaked roof inlet;
·
equipped with a manometer;
·
able to hold and seal the filter paper to the sampler
housing in a horizontal position;
·
easy to change the filter; and
·
capable of operating continuously for 24-hr period.
The ET shall
agree with the SOR, in consultation with the IEC, the position of the HVS. When positioning the samplers, the
following points shall be noted:
·
a horizontal platform with appropriate support to
secure the samplers against gusty wind shall be provided;
·
the distance between the sampler and an obstacle, such
as buildings, shall be at least twice the height that the obstacle protrudes
above the sampler;
·
a minimum of 2 m of separation from walls, parapets
and penthouses is required for rooftop samplers;
·
a minimum of 2 m of separation from any supporting
structure, measured horizontally is required;
·
no furnace or incinerator flue is nearby;
·
airflow around the sampler is unrestricted;
·
the sampler is more than 20 m from the dripline;
·
any wire fence and gate, to protect the sampler, shall
not cause any obstruction during monitoring;
·
permission must be obtained to set up the samplers and
to obtain access to the monitoring stations;
·
a secured supply of electricity is needed to operate
the samplers; and
·
no two samplers should be placed less than 2 m apart.
Calibration of
dust monitoring equipment shall be conducted upon installation and thereafter
at bi-monthly intervals. The
transfer standard shall be traceable to the internationally recognised primary
standard and be calibrated annually.
The calibration data shall be properly documented for future reference
by concerned parties, such as the IEC.
All the data shall be converted into standard temperature. The flow-rate of the sampler before and
after the sampling exercise with the filter in position shall be verified to be
constant and recorded.
If direct
reading dust meter is proposed to measure 1-hour TSP levels on an ad hoc basis, sufficient information
shall be submitted to the IEC to prove that the instrument is capable of achieving
a comparable result as that of the HVS and may be used for the 1-hour
sampling. The instrument should
also be calibrated regularly and the 1-hour sampling shall be checked
periodically by the HVS to check the validity and accuracy of the results
measured by the direct reading method.
Wind data
monitoring equipment will be set up at suitable location for logging the wind
speed and wind direction at or near one of the air quality monitoring stations
proposed in Table 2.1 which are
located near the source of dust from the construction works area. The wind data monitoring equipment
should be installed and operated by considering the following conditions:
·
the
wind sensors should be installed on mast at an elevated level 10 m above ground
so that they are clear of obstructions or turbulence caused by the buildings;
·
the wind data should be captured by a data
logger to be downloaded for processing at least once a month;
·
the wind data equipment should be
re-calibrated at least once every six months; and
·
wind direction should be divided into 16
sectors of 22.5 degrees each.
In
exceptional situations, the ET may propose alternative methods to obtain
representative wind data upon approval from the SOR and agreement from the IEC.
2.5
Laboratory Measurement and Analysis
A clean
laboratory with constant temperature and humidity control and equipped with
necessary measuring and conditioning instruments shall be used for sample
analysis and equipment calibration and maintenance. The laboratory shall be HOKLAS accredited.
Filter paper
of size 8"x10" shall be labelled before sampling. It shall be a clean filter paper with no
pin holes and shall be conditioned in a humidity controlled chamber for over
24-hr and be pre-weighed before use for the sampling.
After sampling,
the filter paper loaded with dust shall be kept in a clean and tightly sealed
plastic bag. The filter paper shall
then be returned to the laboratory for reconditioning in the humidity
controlled chamber followed by accurate weighing by an electronic balance with
a readout down to 0.1 mg. The
balance shall be regularly calibrated against a traceable standard. All the collected samples shall be kept
in a good condition for 6 months before disposal.
2.6
Monitoring Period and
Frequency
2.6.1
Enhanced TSP Monitoring Plan - Baseline
Baseline
monitoring will be conducted to collect representative TSP data from the five
monitoring stations. This baseline
monitoring will provide data for comparison with TSP data collected during the
construction phase.
The baseline
monitoring will be conducted at the air quality monitoring stations listed in Table 2.1 for 14 consecutive days prior
to the start of the construction works to obtain daily 24-hour TSP
samples. 1-hour sampling shall also
be undertaken at least 3 times per day during the same period. Monitoring shall take place prior to the
commencement of any construction works of the Northern Connection, toll plaza,
tunnel buildings and TCSS. The
proposed monitoring frequency is detailed in Table 2.2.
Table 2.2 Monitoring
Frequency of Baseline Enhanced TSP Monitoring Plan
|
Monitoring Parameter |
Monitoring
Location |
Frequency |
Monitoring Condition |
|
1-hour TSP |
ASR1, ASR5, ASR10, AQMS1, AQMS2 |
3 times per day for 14 consecutive
days |
Before
commencement of any construction works of the Northern Connection, toll
plaza, tunnel buildings and TCSS. |
|
24-hour TSP |
ASR1, ASR5, ASR10, AQMS1, AQMS2 |
Daily for 14 consecutive days |
Before
commencement of any construction works of the Northern Connection, toll
plaza, tunnel buildings and TCSS |
The monitoring
schedule for baseline monitoring shall be developed by the ET and provided to
the SOR and IEC for agreement prior to the monitoring works.
In the event
that insufficient baseline monitoring data or questionable results are
obtained, the ET shall liaise with the DEP to agree on an appropriate set of
data to be used as a baseline reference and submit this data to the SOR and IEC
for approval.
Ambient
conditions may vary seasonally and shall be reviewed at three monthly
intervals. If the ET considers that
the ambient conditions have changed and a repeat of the baseline monitoring is
required to be carried out for obtaining updated baseline levels, the
monitoring should be at times when the Contractor's activities are not
generating dust, at least in the proximity of the monitoring stations. Should a change in ambient conditions be
determined, the baseline levels and, in turn, the TSP Action and Limit Levels
criteria, shall be revised. The
revised baseline levels and TSP Action and Limit Levels shall be agreed with
the DEP and supplied to the IEC.
2.6.2
Enhanced TSP Monitoring Plan - Construction Phase
The Enhanced
TSP Monitoring Plan will be implemented simultaneously with the air quality
impact monitoring in the EM&A programme. In addition to the TSP monitoring at
ASR1 and ASR5, monitoring will also be undertaken at the additional monitoring
stations AQMS1, AQMS2 and ASR10 following the frequency of air quality impact
monitoring stated in the EM&A Manual.
The data collected will be used to provide an indication of whether
there is any significant increase in TSP levels upon commencement of
construction activities of the Northern Connection, toll plaza and tunnel
buildings. TSP monitoring,
including those required under the approved EM&A Manual (ie for ASR1 and
ASR5 only) and this Enhanced TSP Monitoring Plan, will not be implemented
during the TCSS installation works which will not involve any civil works.
The major
sources of dust nuisance arising from the Northern Connection, toll plaza and
tunnel buildings are related to excavation, slope works, foundation works,
construction of road and superstructures, wind erosion from reclaimed areas,
open sites and stockpiling areas.
Therefore, during these construction activities, the TSP monitoring
frequency will be increased at all air quality monitoring stations such that
any deteriorating air quality can be readily detected and timely action taken
to rectify the situation. The
Enhanced TSP Monitoring Plan during construction phase is summarized in Table 2.3.
Table
2.3 Enhanced
TSP Monitoring Plan – Construction Phase
|
Monitoring Parameter |
Monitoring Location |
Frequency |
Monitoring Condition (1)
|
|
1-hour
TSP |
ASR1,
ASR5, ASR10, AQMS1, AQMS2 |
3
times per day every six days |
Throughout
the Northern Connection, toll plaza and tunnel buildings construction works |
|
24-hour
TSP |
ASR1,
ASR5, ASR10, AQMS1, AQMS2 |
Daily
every six days |
Throughout
the Northern Connection, toll plaza and tunnel buildings construction works |
|
1-hour
TSP |
ASR1,
ASR5, ASR10, AQMS1, AQMS2 |
3
times per day every three days |
Northern Connection During
excavation works for launching shaft, excavation work for Cut and Cover
Tunnel and Cut and Cover Tunnel Construction Toll Plaza During
excavation, slope works, construction of road and superstructures and wind
erosion from open sites and stockpiling areas Tunnel Buildings During
excavation, foundation works, construction of superstructures and wind erosion
from open sites and stockpiling areas |
|
24-hour
TSP |
ASR1,
ASR5, ASR10, AQMS1, AQMS2 |
Daily
every three days |
Northern Connection During
excavation works for launching shaft, excavation work for Cut and Cover Tunnel
and Cut and Cover Tunnel Construction Toll Plaza During
excavation, slope works, construction of road and superstructures and wind
erosion from open sites and stockpiling areas Tunnel Buildings During
excavation, foundation works, construction of superstructures and wind
erosion from open sites and stockpiling areas |
Noted:
(1) The
Enhanced TSP Monitoring Plan will be undertaken when any of the monitoring
condition(s) is triggered.
A preliminary
Enhanced TSP Monitoring Programme is provided in Figure 2.2. The
monitoring programme is developed based on the construction schedule supplied
by the Contractor under the Contract No
HY/2012/08, and will be agreed with EPD and supplied to the IEC. The construction programmes of the toll
plaza and tunnel buildings are not available during the preparation of this
Plan since the construction contracts are not yet awarded. The Enhanced TSP Monitoring Programme
will be updated when the construction programmes of the toll plaza and tunnel
buildings are available for consideration.
The ET will
notify the SOR and IEC at least one month before the monitoring frequency will
be increased according to the Enhanced TSP Monitoring Plan (ie at least one
month before commencement of relevant works for which increased monitoring
frequency is required in accordance with Table
2.3).
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