2.1.1
With
reference to
Section 2.2.25 of the EM&A manual, the baseline air quality monitoring
shall be carried out for at least 14 consecutive days prior to the commissioning
of the construction works. 1-hour TSP sampling shall be done at least 3 times
per day at each monitoring station. During the baseline monitoring. There
should not be any construction or dust generating activities in the vicinity of
the monitoring stations.
2.1.2
As
permission of access and 220V AC power supply could not be obtained from the
designated dust monitoring locations, a direct reading dust meter is proposed
to measure 1-hour TSP levels in accordance with Section 2.2.10 of the EM&A
manual.
2.2.1
In
accordance with Section 2 of the EM&A Manual, air quality monitoring should
be carried out at 2 designated monitoring locations. The air quality monitoring
stations summarised in Table 2.1 and shown in Figure 2.
2.3.1
Portable
Laser Particle Photometer Monitors (Sibata Model LD-3B / 5R) complete with
appropriate sampling inlets are employed for 1-hour TSP measurement.
Measuring Procedures
a) Pulling up the air sampling inlet
cover
b) Changing the Mode 0 to BG
c) Pressing Start/Stop switch
d) Turning the knob to SENSI.ADJ and
press it
e) Pressing Start/Stop switch again
f) Returning the knob to the position
MEASURE slowly
g) Pressing the timer set switch to
set measuring time
h) Removing the cap and start the
measurement
Equipment Calibration
1-hour
dust meter should be calibrated at 1 year intervals. The calibration
certificates are presented in Appendix A.
2.3.2
The
model of the air quality monitoring equipment used is summarized in Table 2.2.
2.4.1
The
baseline monitoring work was conducted between 1 December 2020 and 14 December
2020. The baseline monitoring schedule is provided in Appendix F.
2.4.2
During
the baseline monitoring, at AM1, road traffic along Wang Lee Street was
observed in the surroundings. At AM2, road traffic from squatter house at the
west of Yuen Long STW was observed during the baseline monitoring.
2.4.3
The
monitoring data are summarized in Table 2.3. Detailed air quality monitoring
data are presented in Appendix B and wind data are presented
in Appendix
H.
2.5.1
The
Action and Limit (A/L) Levels to be used for determining the construction dust
are summarized in Table 2.4.
2.5.2
Following
the above guidelines, the Action and Limit Levels for air quality impact
monitoring have been set, as presented in Table 2.5.
2.6.1
The
Event and Action Plan for Air Quality are given in Appendix E.