a)
0.6 - 1.7 m3 per
minute adjustable flow range;
b)
equipped with a timing /
control device with +/- 5 minutes accuracy for 24 hours operation;
c)
installed with elapsed-time
meter with +/- 2 minutes accuracy for 24 hours operation;
d)
capable of providing a
minimum exposed area of 406 cm2;
e)
flow control accuracy: +/-
2.5% deviation over 24-hour sampling period;
f)
equipped with a shelter to
protect the filter and sampler;
g)
incorporated with an
electronic mass flow rate controller or other equivalent devices;
h)
equipped with a flow
recorder for continuous monitoring;
i)
provided with a peaked roof
inlet;
j)
incorporated with a
manometer;
k)
able to hold and seal the
filter paper to the sampler housing at horizontal position;
l)
easily changeable filter;
and
m)
capable of operating
continuously for a 24-hour period.
a)
The wind sensors should be
installed 10 m above ground so that they are clear of obstructions or
turbulence caused by buildings.
b)
The wind data should be
captured by a data logger. The data
shall be downloaded for analysis at least once a month.
c)
The wind data monitoring
equipment should be re-calibrated at least once every six months.
d)
Wind direction should be
divided into 16 sectors of 22.5 degrees each.
Table 2.1 Construction
Dust Monitoring Locations
Identification No. |
Location |
MA1 |
Wanchai – Pedestrian Plaza |
MA2 |
Wanchai – Wanchai Sports Ground |
MA3 |
Causeway Bay – Bowling Green, Victoria Park |
MA4 |
Causeway Bay – Royal Hong Kong Yacht Club |
a)
be at the site boundary or
such locations close to the major dust emission source;
b)
be close to the sensitive
receptors; and
c)
take into account the
prevailing meteorological conditions.
a)
a horizontal platform with
appropriate support to secure the samplers against gusty wind should be
provided;
b)
no two samplers should be
placed less than 2 meters apart;
c)
the distance between the
sampler and an obstacle, such as buildings, must be at least twice the height
that the obstacle protrudes above the sampler;
d)
a minimum of 2 meters of
separation from walls, parapets and penthouses is required for rooftop
samplers;
e)
a minimum of 2 meters
separation from any supporting structure, measured horizontally is required;
f)
no furnace or incinerator
flue is nearby;
g)
airflow around the sampler
is unrestricted;
h)
the sampler is more than 20
meters from the dripline;
i)
any wire fence and gate, to
protect the sampler, should not cause any obstruction during monitoring;
j)
permission must be obtained
to set up the samplers and to obtain access to the monitoring stations; and
k)
a secured supply of
electricity is needed to operate the samplers.
Table 2.2 Action
/ Limit Levels for Air Quality
Parameters |
Action |
Limit |
24-hour
TSP Level in mg m-3 |
For
baseline level £ 200 mg m-3, Action level = (baseline
level * 1.3 + Limit level)/2; For
baseline level > 200 mg m-3 Action level = Limit level |
260 mg m-3 |
1-hour
TSP Level in mg m-3 |
For
baseline level £ 384 mg m-3, Action level = (baseline
level * 1.3 + Limit level)/2; For
baseline level > 384 mg m-3, Action level = Limit level |
500 mg m-3 |
Table 2.3 Event / Action Plan for Air Quality
ACTION |
||||
ET |
IC(E) |
ER |
CONTRACTOR |
|
ACTION LEVEL |
||||
1. Exceedance for one sample |
1.
Identify source,
investigate the causes of exceedance and propose remedial measures; 2.
Inform IC(E) and ER; 3.
Repeat measurement to
confirm finding; 4.
Increase monitoring
frequency to daily. |
1.
Check monitoring data
submitted by ET; 2.
Check Contractor’s working
method. |
1.
Notify Contractor. |
1. Rectify any unacceptable
practice; 2. Amend working methods if appropriate. |
2. Exceedance for two or more consecutive samples |
1.
Identify source; 2.
Inform IC(E) and ER; 3.
Advise the ER on the
effectiveness of the proposed remedial measures; 4.
Repeat measurements to
confirm findings; 5.
Increase monitoring
frequency to daily; 6.
Discuss with IC(E) and
Contractor on remedial actions required; 7.
If exceedance continues,
arrange meeting with IC(E) and ER; 8.
If exceedance stops, cease
additional monitoring. |
1.
Check monitoring data
submitted by ET; 2.
Check Contractor’s working
method; 3.
Discuss with ET and
Contractor on possible remedial measures; 4.
Advise the ET on the
effectiveness of the proposed remedial measures; 5.
Supervise Implementation
of remedial measures. |
1. Confirm receipt of
notification of failure in writing; 2.
Notify Contractor; 3.
Ensure remedial measures
properly implemented. |
1. Submit proposals for
remedial to ER within 3 working days of notification; 2. Implement the agreed
proposals; 3. Amend proposal if appropriate. |
LIMIT LEVEL |
||||
1. Exceedance for one sample |
1. Identify source,
investigate the causes of exceedance and propose remedial measures; 2. Inform ER, Contractor and
EPD; 3. Repeat measurement to
confirm finding; 4. Increase monitoring
frequency to daily; 5. Assess effectiveness of
Contractor’s remedial actions and keep IC(E), EPD and ER informed of the
results. |
1.
Check monitoring data
submitted by ET; 2.
Check Contractor’s working
method; 3.
Discuss with ET and
Contractor on possible remedial measures; 4.
Advise the ER on the
effectiveness of the proposed remedial measures; 5.
Supervise implementation
of remedial measures. |
1.
Confirm receipt of
notification of failure in writing; 2.
Notify Contractor; 3.
Ensure remedial measures
properly implemented. |
1.
Take immediate action to
avoid further exceedance; 2.
Submit proposals for
remedial actions to IC(E) within 3 working days of notification; 3.
Implement the agreed
proposals; 4. Amend proposal if appropriate. |
2. Exceedance for two or more consecutive samples |
1.
Notify IC(E), ER,
Contractor and EPD; 2.
Identify source; 3.
Repeat measurement to
confirm findings; 4.
Increase monitoring
frequency to daily; 5.
Carry out analysis of
Contractor’s working procedures to determine possible mitigation to be
implemented; 6.
Arrange meeting with IC(E)
and ER to discuss the remedial actions to be taken; 7.
Assess effectiveness of
Contractor’s remedial actions and keep IC(E), EPD and ER informed of the
results; 8.
If exceedance stops, cease
additional monitoring. |
1.
Discuss amongst ER, ET,
and Contractor on the potential remedial actions; 2.
Review Contractor’s
remedial actions whenever necessary to assure their effectiveness and advise
the ER accordingly; 3.
Supervise the
implementation of remedial measures. |
1.
Confirm receipt of
notification of failure in writing; 2.
Notify Contractor; 3.
In consolidation with the IC(E),
agree with the Contractor on the remedial measures to be implemented; 4.
Ensure remedial measures
properly implemented; 5.
If exceedance continues,
consider what portion of the work is responsible and instruct the Contractor
to stop that portion of work until the exceedance is abated. |
1. Take immediate action to
avoid further exceedance; 2. Submit proposals for
remedial actions to IC(E) within 3 working days of notification; 3. Implement the agreed
proposals; 4. Resubmit proposals if
problem still not under control; 5. Stop the relevant portion
of works as determined by the ER until the exceedance is abated. |
WDII (CWB entrusted work)
and WDII (non-CWB entrusted work), managed by TDD
strictly limit the truck
speed on site to below 10 km per hour and water spraying to keep the haul roads
in wet condition;
twice daily watering of the
work site with active operations when the weather and the work site are dry;
water spraying during
excavation and material handling;
provision of vehicle wheel
and body washing facilities at the exit points of the site, combined with
cleaning of public roads where necessary; and
tarpaulin covering of all
dusty vehicle loads transported to, from and between site locations.
CRIII (CWB entrusted work) and CRIII (non-CWB entrusted work), managed
by TDD
strictly limit the truck
speed on site to below 10 km per hour and water spraying to keep the haul roads
in wet condition;
twice daily watering of the
work site with active operations when the weather and the work site are dry;
watering during excavation
and material handling;
·
provision of vehicle wheel
and body washing facilities at the exit points of the site, combined with
cleaning of public roads where necessary; and
·
tarpaulin covering of all
dusty vehicle loads transported to, from and between site locations.
CWB & IECL projects (excluding works entrusted to TDD), managed by
HyD
strictly limit the truck
speed on site to below 10 km per hour and water spraying to keep the haul roads
in wet condition;
twice daily watering of the
work site with active operations when the weather and the work site are dry;
watering during excavation
and material handling;
provision of vehicle wheel
and body washing facilities at the exit points of the site, combined with
cleaning of public roads where necessary; and
tarpaulin covering of all
dusty vehicle loads transported to, from and between site locations.