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) 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 2.1 Baseline Monitoring Locations
Identification
No |
Location |
SKAM |
No
21, Muk Min Shan |
PKAM |
No. 14, Tai Chung Hau |
HCAM |
No 107, Ho Chung New Village |
Table 2.2 Action / Limit Levels for Air Quality
Parameters |
Action |
Limit |
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. Receipt of complaint related to construction dust |
1. Identify source, investigate the causes of complaints and propose
remedial measures; 2. Inform IC(E) and ER; 3. Conduct ad hoc monitoring to confirm finding; 4. Carrying out investigation to identify the source /reasons of complaints.
Investigation shall be completed within 1 weeks; 5. Rectify any unacceptable practice; 6. Amended working methods if required; 7. Correspond to the complainant within 10 days to inform the cause of
the nuisance and action taken. |
1.
Supervise Investigation process; 2.
Check monitoring data submitted by ET; 3.
Check Contractor’s working method. |
1. Notify Contractor. |
1. Rectify any unacceptable
practice; 2. Assist ET to find the root
cause of the complaint; 3. Amend working methods if appropriate. |
LIMIT LEVEL |
||||
1. Exceedance for two ad hoc monitoring sample or more
complaints in 3 months |
1. Identify source, investigate
the causes of exceedance/complaints and propose remedial measures; 2. Inform ER, Contractor and EPD; 3. Repeat measurement to confirm finding; 4. Carrying out investigation to identify the source /reasons of
complaints. Investigation shall be completed within 1 weeks; 5. Correspond to the complainant within 10 days to inform the cause of the
nuisance and action taken; 4. Increase monitoring
frequency to daily; 6. Assess effectiveness of Contractor’s remedial actions and keep IC(E),
EPD and ER informed of the results; 7. If exceedance stops, cease ad hoc monitoring. |
1. Supervise Investigation process; 2. Check monitoring data submitted by ET; 3. Check Contractor’s working method; 4. Discuss with ET and Contractor on possible remedial measures; 5. Advise the ER on the effectiveness of the proposed remedial measures; 6. Supervise implementation of remedial measures. |
1. Confirm receipt of notification of failure in writing; 2. Notify Contractor; 3. Ensure remedial measures properly implemented; 4. 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.
Amend proposal if appropriate; 5.
Stop the relevant portion of works as
determined by the ER until the exceedance is abated. |
Table 2.4 Mitigation Measures Proposed in the EIA Report
Work Area |
Recommended Mitigation Measures |
Sai Kung River |
Twice daily watering of the work site with active operations (material
handling and haul roads) when the weather and the work site are dry. |
Pak Kong River |
Twice daily watering of the work site with active operations (material
handling and haul roads) when the weather and the work site are dry. |
|
Extensive watering of the haul roads (at least every two hours
daily) to keep the haul roads in wet condition. |
Ho Chung Channel |
Twice daily watering of the work site with
active operations (material handling) when the weather and the work site are
dry. |
|
Extensive watering of the haul roads (at least every two hours
daily) to keep the haul roads in wet condition. |
·
skip
hoist for material transport should be totally enclosed by impervious sheeting;
·
every
vehicle should be washed to remove any dusty materials from its body and wheels
before leaving the construction site;
·
the
area where vehicle washing takes place and the section of the road between the
washing facilities and the exit point should be paved with concrete, bituminous
materials or hardcores;
·
where
a site boundary adjoins a road, streets or other accesses to the public,
hoarding of not less than 2.4 m high from ground level should be provided along
the entire length except for a site entrance or exit;
·
all
dusty materials should be sprayed with water prior to any loading, unloading or
transfer operation so as to maintain the dusty materials wet;
·
all
stockpiles of aggregate or spoil should be covered and water applied;
·
any odorous dredged material should be placed remote
from air sensitive receivers;
·
any odorous permitted stockpiled material
should be removed within two days of work to reduce the amount of time
available for decomposition; and
· any odorous permitted stockpiled material should be covered with plastic tarpaulin sheets.