Appendix
B
- Action and Limit Levels
Table B-1 Action
and Limit Levels for 1-Hour TSP
Location |
Action
Level, μg/m3 |
Limit Level, μg/m3 |
AMS1 |
381 |
500 |
AMS4 |
352 |
Table B-2 Action
and Limit Levels for 24-Hour TSP
Location |
Action Level, μg/m3 |
Limit Level, μg/m3 |
AMS1 |
170 |
260 |
AMS4 |
171 |
Table B-3 Action
and Limit Levels for
Construction Noise
Time Period |
Action Level |
Limit Level |
0700-1900 hrs on normal
weekdays |
When one
documented complaint is received |
75 dB(A) * |
Noted: If works
are to be carried during restricted hours, the conditions stipulated in the
construction noise permit issued by the Noise Control Authority have to be
followed.
(*) reduce
to 70 dB(A) for schools and 65 dB(A) during school examination periods.
Table B-4 Action
and Limit Levels for Water
Quality
Parameter
(unit) |
Water Depth |
Action Level |
Limit Level |
Dissolved Oxygen (mg/L)
(surface, middle, bottom) |
Surface and Middle |
5.0 |
4.2 except 5 for
FCZ |
Bottom |
4.7 |
3.6 |
|
Turbidity (NTU) |
Depth average |
27.5 and 120% of
upstream control station’s turbidity at the same tide of the same day |
47.0 and 130% of turbidity at the upstream control
station at the same tide of same day |
Suspended Solids (mg/L) |
Depth average |
23.5 and 120% of upstream control station’s SS
at the same tide of the same day |
34.4 and 130% of SS at the upstream control station at
the same tide of same day and
10mg/L for WSD Seawater Intakes |
Note:
(1) Depth-averaged is calculated by
taking the arithmetic means of reading of all three depths
(2) For DO, non-compliance
of the water quality limit occurs when monitoring result is lower that the
limit.
(3) For SS & turbidity
non-compliance of the water quality limits occur when monitoring result is
higher than the limits.
(4) All the figures given
in the table are used for reference only and the EPD may amend the figures
whenever it is considered as necessary.
(5) The 1%-ile of baseline
data for dissolved oxygen (surface and middle) and dissolved oxygen (bottom)
are 4.2mg/L and 3.6mg/L respectively.