2.1.1
In accordance with the EM&A Manual, 1-hour Total Suspended
Particulates (TSP) levels should be measured
at the designated air quality monitoring stations to ensure that any
deteriorating air quality could be
readily detected and timely action shall be undertaken to rectify such situation. Impact 1-hour
TSP monitoring was conducted for at least three times every 6 days when the highest dust
impact occurs.
2.2.1
A portable direct reading dust meter was used to carry out the 1-hour
TSP monitoring at the designated
monitoring stations.
2.2.2
Wind data monitoring equipment is provided at the conspicuous locations
for logging wind speed and wind direction
near to the dust monitoring locations. The equipment installation location is agreed with the
ER and the IEC.
2.2.3
The details of the air quality monitoring equipment used are summarized
in Table 3.
2.3
Monitoring Methodology for Direct Reading Dust
Meter
2.3.1
SIBATA LD-5R Digital Dust Indicator 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 D.
2.4
Maintenance and Calibration for Direct Reading Dust
Meter
2.4.1
ET shall submit sufficient information to the IEC to prove that the
instrument is capable of achieving
comparable results to the HVS. The instrument should also be calibrated
regularly, and the 1-hour sampling
shall be determined periodically by the HVS to check the validity and accuracy of the results
measured by direct reading method. The calibration certificate for the direct reading dust meter
is provided in Appendix D.
2.5.1
In accordance with the EM&A Manual, two air quality monitoring
locations, namely AM1, AM2 are covered
under Contract No. SPW 02/2023 “Environmental Team for Construction of Yuen Long Effluent Polishing
Plant Stage 1”.
2.5.2
The most updated locations are summarized in Table 4 and the locations of the air monitoring stations shown
in Figure 2.
2.6.1
The schedule of air quality monitoring in reporting month is provided in
Appendix E.
2.6.2
No Action / Limit Level exceedance was recorded for 1-hr TSP at AM1 and
AM2.
2.6.3
No effect that arose from the other special phenomena and work progress
of the concerned site was noted during the
current monitoring month.
2.6.4
The weather and meteorological conditions during the monitoring are
provided in Appendix K.
2.6.5
The Air Quality Monitoring Results of 1-hr TSP are summarized in Table 5. Detailed monitoring data are
presented in Appendix F.
2.6.6
The Action and Limit Levels for air quality monitoring have been set and
are presented in Appendix C.
2.6.7
The Event and Action Plan for air quality is given in Appendix H.
2.6.8
The wind data obtained from the on-site wind station during the
reporting period is provided
in Appendix G.
2.7
Comparison of 1-hr TSP Monitoring Results with EIA
Predictions
2.7.1
The monitoring data of 1-hr TSP was compared with the EIA predictions as
summarized in Table 6.
2.7.2
The 1-hr TSP monitoring results at AM1 and AM2 were below the Predicted
Maximum Hourly Average TSP Concentration
in the approved Environmental Impact Assessment (EIA) Report.