Appendix D - Summary of Action and Limit
Levels
Table
1 ¡V Action and Limit Levels for 1-hour TSP
Location |
Action Level |
Limit Level |
AMS2 |
374 mg/m3 |
500 mg/m3 |
AMS3B* |
368 mg/m3
|
500 mg/m3 |
AMS6 |
360 mg/m3 |
500 mg/m3 |
AMS7A# |
370 mg/m3 |
500 mg/m3 |
Remarks: * Action
Level set out at AMS3 Ho Yu College is adopted.
#Action
level set out at AMS7 Hong Kong SkyCity Marriott Hotel is adopted.
Table
2 ¡V Action and Limit Levels for 24-hour TSP
Location |
Action Level |
Limit Level |
AMS2 |
176 mg/m3 |
260 mg/m3 |
AMS3B* |
167 mg/m3 |
260 mg/m3 |
AMS6 |
173 mg/m3 |
260 mg/m3 |
AMS7A# |
183 mg/m3 |
260 mg/m3 |
Remarks: * Action
Level set out at AMS3 Ho Yu College is adopted.
#Action
level set out at AMS7 Hong Kong SkyCity Marriott Hotel is adopted.
Table 3 ¡V Action and
Limit Levels for Construction Noise (0700-1900 hrs of normal weekdays)
Location |
Action Level |
Limit Level |
NMS2 |
When one documented complaint, related to 0700 ¡V
1900 hours on normal weekdays, is received from any one of the sensitive receivers |
75 dB(A) |
NMS3B |
*65 / 70 dB(A) |
*Daytime
noise Limit Level of 70 dB(A) applies to education institutions, while 65dB(A)
applies during school examination period.
Table 4 ¡V Action and
Limit Levels for Water Quality
Parameters |
Action |
Limit |
DO
in mg L-1 (Surface,
Middle & Bottom) |
Surface and Middle 5.0 Bottom 4.7 |
Surface and Middle 4
.2 (except 5 mg/L for FCZ) Bottom 3.6 |
SS
in mg L-1 (depth-averaged) |
23.5
and 120% of upstream control station's SS at the same tide of the same day |
34.4
and 130% of upstream control station's SS at the same tide of the same day
and 10mg/L for WSD Seawater intakes |
Turbidity
in NTU (depth-averaged) |
27.5
and 120% of upstream control station's turbidity at the same tide of the same
day |
47.0
and130% of upstream control station's turbidity at the same tide of the same
day |
Notes:
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 limits occurs when monitoring result is
lower
than the limits.
3. For turbidity, SS,
non-compliance of the water quality limits occurs when monitoring result
is higher than the limits.
Table 5(a) Action and Limit Levels for Chinese White Dolphin Monitoring
- Approach to Define Action Level (AL) and Limit Level (LL):
|
North Lantau Social
Cluster |
|
|
NEL |
NWL |
Action Level |
(STG <
70% of baseline) & (ANI <
70% of baseline) |
(STG <
70% of baseline) & (ANI <
70% of baseline) |
Limit Level |
[(STG
< 40% of baseline) & (ANI
< 40% of baseline)] AND [ (STG
< 40% of baseline) & (ANI
< 40% of baseline)] |
For
North Lantau Social Cluster, action level will be trigger if either NEL or NWL fall below the criteria; limit
level will be triggered if both NEL and
NWL fall below the criteria.
Table 5(b)
Derived Value of Action Level (AL) and Limit Level (LL) for Chinese White
Dolphin Monitoring
|
North
Lantau Social Cluster |
|
|
NEL |
NWL |
Action
Level |
(STG
< 4.2) & (ANI
< 15.5 ) |
(STG
< 6.9) & (ANI
< 31.3) |
Limit
Level |
[(STG
< 2.4) & (ANI <8.9)] AND [
(STG < 3.9)& (ANI < 17.9)] |