3
ENVIRONMENTAL MONITORING
REQUIREMENTS
Monitoring Requirements
3.1.1
In accordance with the approved
EM&A Manual
Monitoring Frequency and
Schedule
3.1.2
The monitoring parameters and
frequency are summarized in Table 3.
Table 3.
|
Parameters |
Duration / hour |
Frequency |
|
24-hour
TSP |
24 |
Once
Every Six Days |
|
|
|
Three
Times Every Six Days |
Monitoring Locations
3.1.3
For Phase
3.1.4
The three monitoring stations
(ASR
Table 3.2 TSP Monitoring Locations
|
Location I.D. |
Description |
|
ASR |
Mei Foo Sun Chuen (at the roof of the toilet block) |
|
ASR2 |
DSD Pumping Station (in the proximity of Stonecutters Military Base) |
|
ASR3 |
Hoi Lai Estate Hoi Yin House
(roof, 40/F ) |
3.1.5
Wind data monitoring was
carried out at the area P
3.1.6
Continuous 24-hour and
3.1.7
Details of the monitoring
equipment are given in Table 3.3. A copy
of the calibration certificate for the HVS and wind data monitor are attached
in Appendix G1 and Appendix G2 respectively.
Table 3.3 Air Quality
Monitoring Equipment
|
Equipment |
Model |
Qty. |
|
HVS |
TE-5 |
3 |
|
Calibrator |
TE-5028A Tisch Environmental Inc. |
|
Monitoring Procedures and Calibration Details of HVS
3.1.8
Calibration Procedures -
Calibration procedures of HVS are as follows (calibration certificates are
presented in Appendix G3) :
i.
A certified orifice transfer
standard with a calibration curve was used for the calibration.
ii.
The transfer standard was
connected to the inlet of the sampler.
The orifice manometer was then connected to the orifice pressure
port. The manometer’s connecting tubing
was inspected to make sure that there are no leaks between the orifice unit and
the sampler.
iii.
The motor was then disconnected
from the flow controller and plugged directly to an AC power source.
iv.
A weather station has been
setup at the Site Office to measure and record the ambient temperature, Ta (K)
and the barometer pressure Pa (mmHg) during calculation.
v.
The sampler was allowed to run
for at least 2 minutes to re-establish the run temperature conditions. The pressure drop across the orifice and the
well-type manometer reading was recorded during calibration. The variable resistance was adjusted to
repeat recording for four different flow rates.
vi.
The best fit straight line was
determined by linear regression and the slope (m
3.1.9
Operating/Analytical Procedure
i.
The flow rate of the HVS was
set to about
ii.
The samplers was located such
that:
a. the filter was about
b. it was greater than 20 meters away from trees.
c. it was separated from any obstacle by at least twice the height of
the obstacle protruding above the sampler.
d. it has unrestricted airflow 270° around the sampler.
iii.
Fiberglass filters were used
for TSP sampling (G8
iv.
All filters were equilibrated
in the conditioning environment for 24 hours before weighing. The conditioning
environment has a temperature setting between 25°C and 30°C and should not vary
by more than ±3°C; the relative humidity was < 50% and should not vary by
more than ±5%.
v.
A new filter was placed with stamped number upward on a supporting
screen.
vi.
The filter was properly aligned
on the screen so that the gasket formed an air-tight seal on the outer edges of
the filter.
vii.
Shelter lid
viii.
The sampler was then allowed to
run for at least 5 minutes to establish run-temperature conditions.
ix.
The flow indicator reading was
recorded and the sampler flow rate was determined.
x.
The programmable timer was set
and the starting sampling time, weather condition and the filter number was
recorded.
xi.
At the end of sampling, the
filter was transferred from the filter holder of the HVS to a sealable plastic
bag and sent to the HOKLAS accredited laboratory for weighing. The elapsed time was also recorded. A copy of
the HOKLAS Certificate is attached in Appendix G5.
xii.
Before weighing, all filters
were equilibrated in a desiccator for 24 hours with temperature of 25°C±3°C and
the relative humidity (RH) 50%±5%, preferably 40%.
3.1.10 Maintenance
i.
The high volume sampler and
their accessories were maintained in good working condition; include replacing
motor brushes routinely and checking electrical wiring to ensure continuous
power supply.
ii.
The high volume samplers were
calibrated at bi-monthly intervals using TE-5028A Tisch Environmental Inc.
Calibration Kit throughout all stages of the air quality monitoring.
3.1.11 The Event/Action Plan for Air Quality is presented in Appendix H1.
3.2.1
Noise monitoring was conducted
at three
monitoring stations to monitor the construction noise impact.
3.2.2
According to the field study,
the noise generated from the major roads (such as Route 3 highway and Container
Port Road) was noticeable at all noise monitoring stations and therefore the
major roads were considered as an influencing factor of the noise sensitive
receivers.
3.2.3
As the noise monitoring
stations are located at urban area and directly affected by this Influencing
Factor (IF), the Area Sensitivity Rating of the noise monitoring stations is
considered to be “C” according to the Table
3.2.4
The Action/Limit Levels for the
environmental monitoring works is established according to the EM&A manual
and the Technical Memorandum under Noise Pollution Control Ordinance and is
presented in Appendix D2.
Monitoring Frequency and Schedule
3.2.5
The monitoring schedule is
presented in Appendix E and the frequency and
parameters of noise measurement are summarized in Table 3.4.
Table 3.4 Noise Monitoring Frequency and Parameters
|
Time Period |
Duration / min. |
Parameters |
Frequency |
|
Daytime (0700 to |
30 (6 consecutive Leq(5min) in
average) |
Leq,
L90 & L |
Once
per week |
|
*Evening ( |
5 |
Leq,
L90 & L10 |
Six
times per week |
|
*Night (2300 to 0700 next day) |
5 |
Leq,
L90 & L10 |
Four
times per week |
|
* |
5 |
Leq,
L90 & L10 |
Six
times per week |
* Restricted hour noise monitoring: to be
conducted only when there is construction work carried out under valid CNP.
3.2.6
For Phase
3.2.7
The three monitoring stations
(NSR
Table 3.5 Location of the Noise Monitoring Stations
|
Location I.D. |
Description |
Type of measurement |
|
NSR |
Mei Foo Sun Chuen (at the roof of the toilet block) |
Free
Field |
|
NSR2 |
DSD Pumping Station (in the proximity of Stonecutters Military Base) |
Free
Field |
|
NSR3 |
Hoi Lai Estate Hoi Yin House (roof, 40/F) |
Free
Field |
Monitoring
Equipment
3.2.8
Integrating Sound Level Meters
were used for noise monitoring which were Type
Table 3.6 Noise Monitoring
Equipment
|
Equipment |
Model |
|
Integrating
Sound Level Meter |
SC-30, CESVA; NL-31, Rion |
|
Calibrator |
CB-5, CESVA |
|
Portable Wind
Speed Indicator |
PWM2, Dwyer |
Monitoring Procedures and Calibration
Details
3.2.9
Field Monitoring
i.
The microphone of the Sound
Level Meter (with weatherproof kit) was mounted on a tripod at a height of 2m
above ground level.
ii.
For free field measurement, the
meter was positioned away from any nearby reflective surfaces.
iii.
AC power supply was checked to
ensure good functioning of the meter.
iv.
Parameters such as frequency
weighting, the time weighting and the measurement time were set as
follows:frequency weighting : A
a.
time weighting : Fast
b.
time measurement : 30
minutes / 5 minutes
v.
Prior to and after each noise
measurement, the meter was calibrated using the Calibrator for 94 dB at
vi.
The wind speed was frequently
checked with the portable wind meter.
vii.
At the end of the monitoring
period, the Leq, L90 and L
viii.
Noise measurement was paused
during periods of high intrusive noise if possible and observation was recorded
when intrusive noise was not avoided.
ix.
Noise monitoring was cancelled
in the presence of fog, rain, and wind with steady speed exceeding 5 m/s, or
wind with gusts exceeding
3.2.10 Maintenance and Calibration
i.
The microphone head of the
sound level meter and calibrator were cleaned with a soft cloth at quarterly
intervals.
ii.
The meter was sent to the
supplier to check and calibrate yearly.
iii.
Calibration certificates are
presented in Appendix G4.
3.2.11
The Event/Action Plan for Noise
impact is presented in Appendix H2.