2.1
According to EM&A Manual of the Kai Tak Development EIA Study and contract
requirement under Contract No. KLN/2013/16, 1-hour and 24-hour TSP monitoring were conducted to monitor the air quality for KTD. For regular impact monitoring, a sampling frequency of at least once in
every six days at all of the monitoring stations for 24-hour TSP monitoring.
For 1-hour TSP monitoring, the sampling frequency of at least three times in
every six days shall be undertaken when the highest dust impact occurs. Appendix A shows the established Action/Limit Levels for the environmental
monitoring works.
2.2
Eight designated monitoring stations
were selected for air quality monitoring programme. Impact
dust monitoring was conducted at seven air quality monitoring stations, namely, Contractor Site Office
of KL/2012/02 (AM1(B)), Lee Kau
Yan Memorial School (AM2), Holy Trinity Bradbury Centre (AM3(A)), Ma
Tau Kok Road (EMSD Workshops) temporary (AM4(B)), Po Leung Kuk Ngan Po Ling College
(AM5(A)), Ching Long Shopping Centre (AA1) and Tak Long
Estate (AA2) in the
reporting month. Table 2.1
describes the air quality monitoring locations, which are also depicted in Figure 2.
Table 2.1 Locations
for Air Quality Monitoring
|
Monitoring Stations |
Locations |
Location of Measurement |
|
AM1(B) |
Contractor Site Office (KL/2012/02) |
Ground Floor Area |
|
AM2 |
Lee Kau Yan Memorial School |
Rooftop (about 8/F) Area |
|
AM3(A) |
Holy Trinity Bradbury Centre |
Rooftop (about 8/F) Area |
|
AM4(B)* |
Ma Tau Kok Road (next to EMSD Workshops) temporary |
Ground Floor Area |
|
AM5(A) |
Po Leung Kuk Ngan Po
Ling College |
Rooftop (about 10/F) Area |
|
#AM6 |
PA 15 |
Site 1B4 (Planned) |
|
^AA1 |
Ching Long Shopping
Centre |
Rooftop (about 3/F) Area |
|
^AA2 |
Tak Long Estate |
Rooftop (about 3/F) Area |
Remarks: *
1-hour TSP at AM4(A) – EMSD Workshop on 28 and 29
December 2016 were cancelled due to
unsuccessful accessibility to the facility. An alternative 1-hr TSP monitoring
was conducted at AM4(B) – Ma Tau Kok Road (next to
EMSD Workshops) temporarily in the reporting month while 24-hr TSP was cancelled
due to permission at suitable locations in vicinity was not granted in the
reporting month.
#
Baseline/Impact monitoring will be conducted when the premise is occupied or
instructed by
Engineer.
^ Supplementary monitoring station
under contract requirement of Contract No. KLN/2013/16.
Impact
monitoring not required in the EM&A Manual of the Kai Tak
Development EIA Study.
2.3
Table
2.2 summarizes the equipment used in the impact air monitoring programme. Copies of calibration certificates are attached
in Appendix B.
Table 2.2 Air
Quality Monitoring Equipment
|
Equipment |
Model
and Make |
Quantity |
|
Calibrator |
TISCH TE-5025A |
1 |
|
1-hour
TSP Dust Meter |
Sibata Model LD-3 and LD-3B/
Met One AEROCET-531 |
6 |
|
HVS
Sampler |
GMWS
2310 c/w of TSP sampling inlet |
7 |
|
Wind Anemometer |
Davis Weather Monitor II, Model no. 7440 |
2 |
Monitoring Parameters, Frequency and Duration
2.4
Table
2.3 summarizes the monitoring parameters and frequencies of impact dust
monitoring for the whole construction period. The air quality monitoring schedule for the reporting month is shown in Appendix D.
Table 2.3 Impact
Dust Monitoring Parameters, Frequency and Duration
|
Parameters |
Frequency |
|
1-hr
TSP |
Three
times / 6 days |
|
24-hr
TSP |
Once /
6 days |
1-hour TSP Monitoring
Measuring Procedures
2.5
The
measuring procedures of the 1-hour dust meters were in accordance with the
Manufacturer’s Instruction Manual as follows:
·
The
1-hour dust meter is placed at least 1.3 meters above ground.
·
Set
POWER to “ON” and make sure that the battery level was not flash or in low
level.
·
Allow
the instrument to stand for about 3 minutes and then the cap of the air
sampling inlet has been released.
·
Push
the knob at MEASURE position.
·
Set
time/mode setting to [BG] by pushing the time setting switch. Then, start the background measurement
by pushing the start/stop switch once.
It will take 6 sec. to complete the background measurement.
·
Push
the time setting switch to change the time setting display to [MANUAL] at the
bottom left of the liquid crystal display.
Finally, push the start/stop switch to stop the measuring after 1 hour
sampling.
·
Information
such as sampling date, time, count value and site
condition were recorded during the monitoring period.
Maintenance/Calibration
2.6
The
following maintenance/calibration was required for the direct dust meters:
·
Check
and calibrate the
meter by HVS to check the validity and accuracy of the results measured by
direct reading method at 2-month intervals throughout all stages of the air quality monitoring.
24-hour TSP Monitoring
Instrumentation
2.7
High
volume (HVS) samplers (Model GMWS-2310 Accu-Vol)
completed with appropriate sampling inlets were employed for 24-hour TSP
monitoring. The sampler was composed of a
motor, a filter holder, a flow controller and a sampling inlet and its
performance specification complied with that required by USEPA Standard Title
40, Code of Federation Regulations Chapter 1 (Part 50). Moreover, the HVS also
met all the requirements in section 2.5 of the updated EM&A Manual.
Operating/Analytical
Procedures
2.8
Operating/analytical
procedures for the operation of HVS were as follows:
·
A
horizontal platform was provided with appropriate support to secure the
samplers against gusty wind.
·
No
two samplers were placed less than 2 meters apart.
·
The
distance between the sampler and an obstacle, such as buildings, was at least
twice the height that the obstacle protrudes above the sampler.
·
A
minimum of 2 meters of separation from walls, parapets and penthouses was
required for rooftop samples.
·
A
minimum of 2 meters separation from any supporting structure, measured
horizontally was required.
·
No
furnaces or incineration flues were nearby.
·
Airflow
around the sampler was unrestricted.
·
The
sampler was more than 20 meters from the drip line.
·
Any
wire fence and gate, to protect the sampler, should not cause any obstruction
during monitoring.
2.9
Prior
to the commencement of the dust sampling, the flow rate of the high volume
sampler was properly set (between 1.1 m3/min. and 1.4 m3/min.)
in accordance with the manufacturer's instruction to within the range
recommended in USEPA Standard Title 40, CFR Part 50.
2.10
For
TSP sampling, fiberglass filters have a collection efficiency of > 99% for
particles of 0.3 μm diameter were used.
2.11
The
power supply was checked to ensure the sampler worked properly. On sampling, the sampler was operated for 5 minutes to establish
thermal equilibrium before placing any filter media at the designated air
monitoring station.
2.12
The
filter holding frame was then removed by loosening the four nuts and a weighted
and conditioned filter was carefully centered with the stamped number upwards,
on a supporting screen.
2.13
The
filter was aligned on the screen so that the gasket formed an airtight seal on
the outer edges of the filter. Then the filter holding frame was
tightened to the filter holder with swing bolts. The applied pressure should be
sufficient to avoid air leakage at the edges.
2.14
The
shelter lid was closed and secured with the aluminum strip.
2.15
The
timer was then programmed. Information was recorded on the
record sheet, which included the starting time, the weather condition and the
filter number (the initial weight of the filter paper can be found out by using
the filter number).
2.16
After
sampling, the filter was removed and sent to the HOKLAS laboratory (Wellab
Ltd.) for weighing. The elapsed time was also
recorded.
2.17
Before
weighing, all filters were equilibrated in a conditioning environment for 24
hours. The conditioning environment temperature
should be between 25°C and 30°C and not vary by more than ±3°C; the relative
humidity (RH) should be < 50% and not vary by more than ±5%. A convenient
working RH is 40%.
Maintenance/Calibration
2.18
The
following maintenance/calibration was required for the HVS:
·
The
high volume motors and their accessories were properly maintained. Appropriate maintenance such as routine
motor brushes replacement and electrical wiring checking were made to ensure
that the equipment and necessary power supply are in good working condition.
·
High
volume samplers were calibrated at bi-monthly intervals using TE-5025A Calibration Kit throughout all
stages of the air quality monitoring.
2.19
1-hour TSP monitoring at AM4(A)
– EMSD Workshop on 29 December 2016 was cancelled due to unsuccessful
accessibility to the facility. An alternative 1-hr TSP monitoring was conducted
at AM4(B) – Ma Tau Kok Road
(next to EMSD workshops) temporarily in the reporting month.
2.20
All other 1-hour TSP monitoring was conducted as
scheduled in the reporting month. No Action/Limit Level exceedance was
recorded.
2.21
24-hour TSP monitoring at AM4(A)
– EMSD Workshop on 28 December 2016 was cancelled due to unsuccessful
accessibility to the facility. Permission for monitoring at suitable locations
in vicinity were not granted and therefore no monitoring at alternative
monitoring location was conducted in the reporting month.
2.22
All other 24-hour TSP monitoring was conducted as
scheduled in the reporting month. No Action/Limit Level exceedance was
recorded.
2.23
The
air temperature, precipitation and the relative humidity data was obtained from Hong
Kong Observatory where the wind speed and wind direction were recorded by the
installed Wind Anemometer, which was relocated from rooftop of Kai Tak Operational Base to rooftop
(about 8/F) of Lee Kau Yan Memorial School since 25 April 2013. The location is shown in Figure 4. This weather
information for the
reporting month is summarized in Appendix
C.
2.24
The
monitoring data and graphical presentations of 1-hour and 24-hour TSP
monitoring results are shown in Appendices
E and F respectively.
2.25
The summary of exceedance record in
reporting month is shown in Appendix H.
No exceedance was recorded for the air quality monitoring.
2.26
According
to our field observations, the major dust source identified at the designated air
quality monitoring stations are as follows:
|
Station |
Major Dust Source |
|
AM1(B) - Contractor Site Office (KL/2012/02) |
Road traffic dust Site vehicle movement |
|
AM2 – Lee
Kau Yan Memorial School |
Road traffic dust Exposed site area and open stockpiles Site vehicle movement |
|
AM3(A) – Holy Trinity Bradbury Centre |
Road traffic dust Exposed site area Excavation works Site vehicle movement |
|
AM4(B) – Ma Tau Kok
Road (EMSD Workshops) temporary |
Recycling company Site vehicle movement |
|
AM5(A) – Po Leung
Kuk Ngan Po Ling College |
Road traffic dust Excavation works at the site (Contract No.:
1/WSD/14(K)) facing Po Leung Kuk Ngan Po Ling College |
|
^AA1 – Ching Long
Shopping Centre |
Road Traffic Dust Exposed site area Excavation works Site vehicle movement |
|
^AA2 – Tak Long Estate |
Road Traffic Dust Exposed site area Excavation works Site vehicle movement |
Remarks: ^ Supplementary
monitoring station under contract requirement of Contract No. KLN/2013/16.
Impact
monitoring not required in the EM&A Manual of the Kai Tak
Development EIA Study.