Appendix D -
Summary of Action and Limit Levels
Table 1 – 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 – 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 – 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 – 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 – 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)] |